Base Realignment and Closure Program Management Office West 1455 Frazee Road, Suite 900 San Diego, California FINAL EXECUTION PLAN

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5 Base Realignment and Closure Program Management Office West 1455 Frazee Road, Suite 900 San Diego, California CONTRACT NO. N D-0809 CTO NO FINAL EXECUTION PLAN DCN: RMAC November 2012 PARCEL C PHASE II RADIOLOGICAL REMEDIATION AND SUPPORT HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CALIFORNIA

6 Base Realignment and Closure Program Management Office West 1455 Frazee Road, Suite 900 San Diego, California CONTRACT NO. N D-0809 CTO NO FINAL EXECUTION PLAN November 2012 PARCEL C PHASE II RADIOLOGICAL REMEDIATION AND SUPPORT HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CALIFORNIA DCN: RMAC Prepared by: 1230 Columbia Street, Suite 750 San Diego, California Prepared by: Shanti Montgomery Technical Lead Reviewed by: Bill Dougherty Project Manager

7 TABLE OF CONTENTS PAGE ABBREVIATIONS AND ACRONYMS... iii 1.0 INTRODUCTION SITE HISTORY REGULATORY FRAMEWORK REMOVAL ACTION OBJECTIVES RELEASE CRITERIA AS LOW AS REASONABLY ACHIEVABLE DATA QUALITY OBJECTIVES PROJECT POINTS OF CONTACT PROJECT SCHEDULE PLAN ORGANIZATION WORK IMPLEMENTATION RADIOLOGICAL STRUCTURE SURVEYS STORM DRAIN AND SANITARY SEWER REMOVAL RADIOLOGICAL SCREENING YARD OPERATIONS Reference Area Radiological Screening Yard Processing LABORATORY OPERATIONS Laboratory Procedures Other Radiological and Chemical Laboratory Samples Laboratory Documentation Quality Control Checks ENVIRONMENTAL PROTECTION PLAN STORMWATER POLLUTION PREVENTION FUGITIVE DUST CONTROL MEASURES Soil Transport and Stockpile Management Air Monitoring SPILL/RELEASE PREVENTION, RESPONSE, AND REPORTING Spill/Release Prevention Spill/Release Response Spill/Release Reporting WASTE MANAGEMENT PRACTICES TRAFFIC CONTROL REVISED SITE TRAFFIC ROUTES TRAFFIC CONTROLS CULTURAL RESOURCE CONTROLS RMAC Fn Execution Plan.doc i Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

8 TABLE OF CONTENTS (Continued) PAGE 5.1 CALIFORNIA STATE HISTORICAL PRESERVATION OFFICE REQUIREMENTS ARCHAEOLOGICAL MONITORING REPORTING SURVEY UNIT PROJECT REPORTS FINAL STATUS SURVEY REPORTS REMOVAL ACTION COMPLETION REPORT ARCHAEOLOGICAL MONITORING SUMMARY REPORT REFERENCES FIGURES Figure 1-1 Figure 1-2 Figure 1-3 Figure 2-1 Figure 2-2 Figure 3-1 Figure 5-1 Work Area Location Map Project Organization Chart Project Schedule Swale and Stormwater Discharge Design Phase II Storm Drain and Sanitary Sewer Removal Areas Dust Control Track-out Points and Air Monitoring Locations Archaeologically Sensitive Zones ATTACHMENTS (on CD only) Attachment 1 Attachment 2 Attachment 3 Attachment 4 Attachment 5 Attachment 6 Sampling and Analysis Plan Project Contractor Quality Control Plan Final Radiation Protection Plan Final Basewide Dust Control Plan Stormwater Pollution Prevention Plan Waste Management Plan RMAC Fn Execution Plan.doc ii Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

9 ABBREVIATIONS AND ACRONYMS ALARA APE ASCII Bi-214 BRAC CDPH CERCLA Cs-137 CSO CTO DoD DON DQO ELAP EPA ES FSS HPNS HRA IR LLRW MARSSIM NCP NELAP pci/g PDF PjM Pu-239 as low as reasonably achievable area of potential effects American Standard Code for Information Interchange bismuth-214 Base Realignment and Closure California Department of Public Health Comprehensive Environmental Response, Compensation, and Liability Act cesium-137 Caretaker Site Office Contract Task Order Department of Defense Department of the Navy data quality objective Environmental Laboratory Accreditation Program U.S. Environmental Protection Agency excavated soil Final Status Survey Hunters Point Naval Shipyard Historical Radiological Assessment Installation Restoration (Program) low-level radioactive waste Multi-Agency Radiation Survey and Site Investigation Manual National Oil and Hazardous Substances Pollution Contingency Plan National Environmental Laboratory Accreditation Program picocuries per gram portable document format Project Manager plutonium-239 RMAC Fn Execution Plan.doc iii Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

10 ABBREVIATIONS AND ACRONYMS (Continued) QC Ra-226 RACR RASO RCA ROC RPM RSO RSY SAP SFRA SHPO SOP Sr-90 SUPR TCRA TSP TtEC VSP WA quality control radium-226 Removal Action Completion Report Radiological Affairs Support Office radiological control area radionuclide of concern Remedial Project Manager Radiation Safety Officer Radiological Screening Yard Sampling and Analysis Plan San Francisco Redevelopment Agency State Historic Preservation Office Standard Operating Procedure strontium-90 Survey Unit Project Report time-critical removal action Task-specific Plan Tetra Tech EC, Inc. Visual Sample Plan Work Area RMAC Fn Execution Plan.doc iv Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

11 1.0 INTRODUCTION The Department of the Navy (DON) contracted with Tetra Tech EC, Inc. (TtEC) to continue the removal action at Parcel C in accordance with the final Base-wide Radiological Removal Action, Action Memorandum Revision 2006 (DON 2006). This removal action consists of the removing the remaining storm drain and sanitary sewer lines and the subsequent radiological surveying, sampling, and remediation of excavations in Parcel C, along with radiological surveying, sampling, and remediation of the ship berths adjacent to Parcel C at Hunters Point Naval Shipyard (HPNS), San Francisco, California. A total of 22,917 linear feet of storm drain and sanitary sewer lines was removed within Parcel C under Contract No. N D-0809, Contract Task Order (CTO) No Removal of the remaining approximately 14,300 linear feet will be executed under CTO No under the same contract. These activities will take place within Parcel C Work Area (WA)-31, WA-33, WA-34, and WA-35 (Figure 1-1). The piping in WA-32 was completely removed under CTO No Radiological Screening Yard (RSY)-4 will be used to radiologically clear the excavated soil. Following radiological processing, the excavated soil will be staged in the DON-designated area pending reuse as backfill material in the excavated trenches or staged for off-site disposal at a Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) landfill by the DON s disposal contractor. To perform this work, the following plans will be used in conjunction with the site-specific information provided in this Execution Plan: Basewide Radiological Management Plan: Final Basewide Radiological Management Plan, Hunters Point Naval Shipyard, dated February 3, 2012 (TtEC 2012a) (or most current revision) including the Basewide Storm Drain and Sanitary Sewer Removal Plan as an attachment Archaeological Monitoring and Discovery Plan: Basewide Archaeological Monitoring and Discovery Plan, Hunters Point Naval Shipyard, in progress (TtEC 2012b) Health and Safety Plan: Parcel C Phase II Accident Prevention Plan/Site Safety and Health Plan, Hunters Point Naval Shipyard (TtEC 2012c) Parcel C Phase II Design Plan: Parcel C Phase II Design Plan, Hunters Point Naval Shipyard (TtEC 2012d) This Execution Plan provides site-specific information not included in the above-referenced plans. The site-specific information addresses the following: Integration of surface drainage from Parcel C Phase II fieldwork into the existing swales and stormwater outfalls Dust control and air monitoring requirements specific to these work locations RMAC Fn Execution Plan.doc 1-1 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

12 Traffic control measures for diverting traffic and maintaining access for site tenants and other DON contractors during construction in Parcel C Location of culturally sensitive areas and archaeological monitoring requirements The following six additional documents have been developed and are presented as attachments to this Execution Plan: Sampling and Analysis Plan (SAP) (Attachment 1) Project Contractor Quality Control Plan (Attachment 2) Radiation Protection Plan (Attachment 3) Dust Control Plan (Attachment 4) Stormwater Pollution Prevention Plan (Attachment 5) Waste Management Plan (Attachment 6) 1.1 SITE HISTORY HPNS is located in the southeastern part of San Francisco on a long promontory that extends east into San Francisco Bay. Presently, HPNS encompasses approximately 866 acres, including approximately 420 acres on land. The land portion of HPNS was purchased by the DON in 1939 and leased to Bethlehem Steel Corporation. At the start of World War II in 1941, the DON took possession of the property and operated it as a shipbuilding, repair, and maintenance facility until 1974 when the DON deactivated HPNS. From 1976 to 1986, the DON leased HPNS to Triple A Machine Shop, Inc. (Triple A), a private ship repair company. In 1986, Triple A ceased operations and the DON resumed occupancy through In 1991, HPNS was placed on the DON s Base Realignment and Closure (BRAC) list, and its mission as a DON shipyard ended in April A 1998 BRAC decision requires full closure and cleanup of HPNS. Essentially, this may entail removal of buildings and structures, including subsurface systems, as well as removal of contaminated materials. HPNS was divided into 12 parcels, A, B, C, D-1, D-2, E, E-2, F, G, UC1, UC2, and UC3. Parcel A, consisting of the most inland 75 acres, was transferred to the San Francisco Redevelopment Agency (SFRA) in The remainder of HPNS will be conveyed to the SFRA once the environmental cleanup is complete. 1.2 REGULATORY FRAMEWORK Environmental investigation and remediation activities are being conducted at HPNS under the Department of Defense (DoD) Installation Restoration (IR) Program in accordance with CERCLA and the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). Under Executive Order 12580, the DON is the lead agency responsible for implementation of the IR Program and the removal action. The U.S. Environmental Protection Agency (EPA) is the lead regulatory agency, while the California Department of Toxic Substances Control and RMAC Fn Execution Plan.doc 1-2 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

13 Regional Water Quality Control Board San Francisco Bay Region will provide state regulatory oversight. 1.3 REMOVAL ACTION OBJECTIVES Based on its radiological operational history, the DON determined that low-level radioactive contamination potentially present in some buildings, storm drain and sanitary sewer lines, soil, debris, and slag material at HPNS required a response action. The Action Memorandum (DON 2006) was prepared to document the DON s decision to undertake time-critical removal actions (TCRAs) at areas throughout HPNS identified as radiologically impacted in the Historical Radiological Assessment, Volume II (HRA) prepared by Naval Sea Systems Command in 2004 (NAVSEA 2004). The HRA lists the radionuclides of concern (ROCs) for the storm drain and sanitary sewer systems as cesium-137 (Cs-137), radium-226 (Ra-226), and strontium-90 (Sr-90), and for the ship berths as Cs-137, plutonium-239 (Pu-239), Ra-226, and Sr-90. The DON has determined (based on its radiological operational history and site-specific investigative data) that the storm drain and sanitary sewer system in Parcel C may contain radioactive material and that the ship berths along Parcel C may also be radiologically impacted as a result of OPERATIONS CROSSROADS ship decontamination and material testing. Therefore, the DON has initiated removal actions in accordance with the Action Memorandum for the screening, characterization, and remediation of radiologically impacted storm drain and sanitary sewer lines within Parcel C and the ship berths adjacent to Parcel C to protect the public health and welfare, and the environment, from actual or potential releases of radiologic contaminants. These removal actions will substantially eliminate the potential threat posed by future migration and/or off-site releases of radioactive material potentially present into the surrounding environment. 1.4 RELEASE CRITERIA Regulatory agencies establish radiation dose standards based on risk considerations and scientific data relating dose to risk. Residual levels of radioactive material that correspond to allowable radiation dose standards are derived by analysis of various pathways and scenarios such as direct exposure, inhalation, and ingestion. Release limits are presented in terms of soil activity concentration and usually refer to average levels of radiation or radioactivity above appropriate background levels. Release limits applicable to soil are expressed in units of activity concentration or picocuries per gram (pci/g). Development of cleanup levels for HPNS was based on the Nuclear Regulatory Commission s screening levels, the EPA s preliminary remediation goals, or agreements between the DON and regulatory agencies. The radiological release criteria for HPNS were established in the Action Memorandum (DON 2006) for the ROCs identified in the HRA (NAVSEA 2004). The radiological release criteria for the Parcel C Phase II storm drain and sanitary sewer system and RMAC Fn Execution Plan.doc 1-3 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

14 ship berths ROCs (Cs-137, Pu-239, Ra-226, and Sr-90) are presented in Table 1 in the SAP (Attachment 1). Chemical contamination at HPNS will be addressed through the IR Program process, consistent with CERCLA and the NCP. Table 2 of the SAP (Attachment 1) identifies the IR Program sites located within the Parcel C Phase II work areas and their associated chemicals of concern. 1.5 AS LOW AS REASONABLY ACHIEVABLE A basic concept in radiation protection specifies that exposure to ionizing radiation and releases of radioactive material should be managed to reduce collective dose to workers and the public and ensure that exposure is as low as reasonably achievable (ALARA). The ALARA principle will be considered during the course of the radiological work carried out under this Execution Plan. The ALARA environmental process will be implemented as described in the Basewide Radiological Management Plan (TtEC 2012a). 1.6 DATA QUALITY OBJECTIVES The data quality objectives (DQOs) specify project objectives, data collection boundaries and limitations, the most appropriate type of data to collect, and the level of acceptable decision error. In addition, the quality and quantity of data required to implement environmental removal actions are defined. The basewide DQOs for Parcel C Phase II address Ship Berths 1, 2, 3, 4, and 5 as well as storm drain and sanitary sewer systems and the associated activities, including processing in the RSY and the on-site and off-site laboratories. The DQOs for the Parcel C Phase II TCRA are identified and described in Worksheet #11 of the SAP (Attachment 1). 1.7 PROJECT POINTS OF CONTACT Figure 1-2 presents the key individuals who are responsible for the oversight and/or implementation of the site activities. 1.8 PROJECT SCHEDULE Figure 1-3 presents the overall project schedule for completing the planning, construction, and reporting activities for this CTO. 1.9 PLAN ORGANIZATION This Execution Plan is organized as follows: Section 1.0 provides the introduction, site history and current operations, regulatory framework, removal action objectives, release criteria, ALARA concept, DQOs, project points of contact, and report organization. Section 2.0 describes the work implementation for the radiologically impacted ship berths and area surveys and for the storm drain and sanitary sewer removal work, including screening and laboratory operations and quality control (QC) checks. RMAC Fn Execution Plan.doc 1-4 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

15 Section 3.0 describes stormwater pollution prevention measures, site-specific requirements for dust control during implementation of the site work, and spill/release prevention, response, and reporting. Section 4.0 provides traffic control measures for diverting traffic and details alternate access routes for site tenants and contractors during construction. Section 5.0 describes coordination with the State Historic Preservation Office (SHPO) and archaeological monitoring to protect cultural resources, if encountered during work activities. Section 6.0 presents details for project reporting. Section 7.0 lists the references cited in the text. Figures are included after the text. Attachment 1 presents the SAP. This plan details laboratory operations that will support the survey activities. Included are procedures for swipe sample analysis, soil sample preparation, gamma spectroscopy analysis, and quality checks. Attachment 2 presents the Project Contractor Quality Control Plan. This plan establishes specific procedures and methods for field inspections, and provides an effective quality control system to ensure the quality of all work performed by TtEC and its subcontractor personnel during the implementation of the Parcel C Phase II fieldwork. Attachment 3 presents the Radiation Protection Plan. This plan identifies the day-to-day management of radiologically impacted sites, remediation, surveys, training requirements, health and safety concerns, and material handling requirements for this project. Attachment 4 presents the Basewide Dust Control Plan, Revision 1. This plan identifies the steps to be taken to reduce fugitive dust emissions during excavation, transportation of soil and debris, and installation/removal of construction site infrastructure. Attachment 5 presents the Stormwater Pollution Prevention Plan. This plan was prepared to ensure construction activities comply with the substantive requirements of the National Pollutant Discharge Elimination System program, specifically the General Construction Activity Stormwater Permit program as set forth by the California Regional Water Quality Control Board General Permit No. CAS000002, Water Discharge Requirements for Discharges of Storm Water Runoff Associated with Construction and Land Disturbance Activities. This plan provides details for implementing best management practices during field activities. Attachment 6 presents the Waste Management Plan. This plan presents the waste management practices and procedures to be followed, and identifies the types of waste expected to be generated. RMAC Fn Execution Plan.doc 1-5 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

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17 2.0 WORK IMPLEMENTATION The following sections discuss the guidance documents and procedures for performing the radiological release of radiologically impacted structures, storm drain and sanitary sewer removal, RSY operations, and laboratory operations. 2.1 RADIOLOGICAL STRUCTURE SURVEYS The Basewide Radiological Management Plan (TtEC 2012a) describes survey and decontamination approaches that will be implemented in support of the radiological release of Ships Berths 1 through 5 adjacent to Parcel C. Under this CTO, the procedures outlined in the Basewide Radiological Management Plan will be followed to conduct Final Status Surveys (FSSs). One Task-specific Plan (TSP) will be developed for the five ship berths, and survey activities will be conducted in accordance with the guidelines in the Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) (NUREG-1575; DoD et al. 2000) and Action Memorandum (DON 2006). Survey activities as well as activities not addressed by MARSSIM will be performed in accordance with this plan, the TSP, and the Standard Operating Procedures (SOPs) presented in the Radiation Protection Plan (Attachment 3). An FSS report will be generated upon completion of the survey and remediation activities. 2.2 STORM DRAIN AND SANITARY SEWER REMOVAL During Phase I of the Parcel C storm drain and sanitary sewer removal actions, the removals were executed in a manner that avoided conflicts with other contractors performing work at HPNS and maintained uninterrupted traffic flow through the site. This resulted in noncontiguous storm drain and sanitary sewer removal in Parcel C, which created four distinct areas in which the Parcel C Phase II removal of storm drain and sanitary sewer piping must be performed to complete the remainder of Parcel C. Three of the areas are located north of Spear Avenue and contain approximately 3,635 linear feet of radiologically impacted storm drain and sanitary sewer lines. These areas include: 1) Lines along Lockwood Street adjacent to Building 134 2) Lines beneath and adjacent to Lockwood Street and south of Fisher Avenue extending to Building 214 3) Lines located between Dry Docks 2 and 3 that are situated entirely within the Hunters Point Commercial Dry Dock Historic District (Dry Dock Historic District) A fourth work area involves the removal of approximately 10,665 linear feet of storm drain and sanitary sewer lines south of Spear Avenue. RMAC Fn Execution Plan.doc 2-1 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

18 The removal of sanitary sewers and storm drains will be conducted in accordance with the existing Basewide Storm Drain and Sanitary Sewer Removal Work Plan, Attachment 1 to the Basewide Radiological Management Plan (TtEC 2012a). This Execution Plan, in conjunction with the Parcel C Phase II Design Plan (TtEC 2012d), provides project-specific details pertaining to the removal of storm drain and sanitary sewer lines within WA-31, WA-33, WA-34, and WA-35. The Basewide Storm Drain and Sanitary Sewer Removal Work Plan provides procedures for performing the radiological surveys of the trench units and removed materials. The Parcel C Phase II removal actions will be performed in the following four phases: Phase 1: The initial phase of the storm drain and sanitary sewer removals will need to be completed prior to the start of the 2013 rainy season. This phase includes the following: The storm drain and sanitary sewer lines beneath Lockwood Street adjacent to Building 134 will be removed to eliminate conflicts with future work. Simultaneously, the lines beneath Lockwood Street and Blandy Street (adjacent to Building 203) will be removed and radiologically cleared so that surface swales can be constructed to quickly reestablish stormwater flow to San Francisco Bay. This will ensure that the large volume of water generated from the City of San Francisco property (formerly Parcel A) and the completed portions of Parcel C can be properly managed. The proposed surface swales will tie into the surface swales constructed during Phase 1, as depicted on Figure 2-1. Phase 2: While the first two areas are being sampled, remediated, and backfilled, the excavation of the storm drain and sanitary sewer lines remaining south of Spear Avenue will commence. For this phase, one radiological control area (RCA) will be established for the entire area south of Spear Avenue that extends from Blandy Street to Building 215 and from the northeast corner of Building 215 to the southern edge of Dry Dock 2. The RCA vehicle control point will be located at the intersection of Blandy Street and Spear Avenue to minimize travel time to RSY-4. Phase 3: This phase involves the removal of the storm drain and sanitary sewer lines beneath and adjacent to Lockwood Street south of Fisher Avenue extending to Building 214. This phase of the removals will require coordination with the DON and the Caretaker Site Office (CSO) to minimize impacts during construction of the durable cover in Parcel UC2. The durable cover project includes the asphalt paving of Fisher Avenue. TtEC will work with the DON to ensure this work is conducted simultaneously to minimize schedule impacts. Phase 4: This phase includes the removal of 875 linear feet of storm drain and sanitary sewer lines located north of Dry Dock 2 in the Dry Dock Historic District. The locations of the storm drain and sanitary sewer removal areas for Phase II are shown on Figure 2-2. RMAC Fn Execution Plan.doc 2-2 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

19 The Parcel C Phase II Design Plan (TtEC 2012d) identifies the storm drain lines, sanitary sewer lines, and manholes to be removed and provides construction procedures to conduct these work activities. The general approach will be to remove the overlying pavement, excavate the soil overlying the storm drain and sanitary sewer lines, and subsequently remove the lines. A minimum of 1 foot of soil will be excavated around and below the pipe. Radiological screening and sampling will be performed ex situ on the pipe. Open storm drain or sanitary sewer lines left in place during the removal process will be plugged to prevent water from entering or exiting pipes. FSSs will be performed on the exposed, excavated trench surfaces. After the results of these activities are evaluated, any identified radiological contamination is removed, and concurrence is received from the Radiological Affairs Support Office, the trenches will be backfilled and the site restored. Throughout the excavation process, soil and piping will be visually inspected for staining or odors. Material that emits odors or is stained will be segregated for further sampling and analysis in accordance with the Basewide Storm Drain and Sanitary Sewer Removal Work Plan (TtEC 2012a). 2.3 RADIOLOGICAL SCREENING YARD OPERATIONS Soil excavated during the removal action activities will be transported to RSY-4 for processing. Processing activities in the RSY include surveying, characterizing, remediating (as necessary), radiologically clearing the materials for either reuse or disposal, and chemical sampling soils derived from IR Program sites. The survey activities performed during processing were designed using MARSSIM (DoD et al. 2000) guidance. The objective of the processing activities in the RSY for excavated soil is to demonstrate that identified residual radioactivity levels for the ROCs in the material to be used as backfill meet the release criteria identified in Table 1 of the SAP (Attachment 1). RSY-4 consists of 29 screening pads and 2 decontamination pads. The RSY will be posted as an exclusion area when in use, in accordance with the appropriate SOP. Figure 2-2 depicts the location of RSY-4 at HPNS Reference Area Reference area samples for the storm drain and sanitary sewer excavated soil processed in the RSY were obtained in April 2006 in an area of the Building 813 parking lot in Parcel D-2. Building 813 was identified in the HRA (NAVSEA 2004) as radiologically impacted; however, its attendant parking lot was not impacted. Eighteen soil samples were collected systematically from the parking lot and were analyzed at the on-site screening laboratory by gamma spectroscopy for use in TCRA remediation decisions. Ten percent of these samples were also analyzed for Sr-90. These reference area samples provided a basis for the net Ra-226 activity concentration. RMAC Fn Execution Plan.doc 2-3 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

20 Background activity for Ra-226 was determined to be pci/g, placing the Curtis and Tompkins, Ltd. satellite laboratory remediation decision level at pci/g of Ra-226 for radiological remediation decisions and for use as definitive data for each excavated soil (ES) survey unit. Curtis and Tompkins is a DoD Environmental Laboratory Accreditation Program (ELAP)-accredited laboratory and is in the process of receiving the California Department of Health (CDPH) certificate of National Environmental Laboratory Accreditation Program (NELAP). This CDPH NELAP accreditation will be completed prior to the start of sampling activities associated with this CTO Radiological Screening Yard Processing Radiological processing of excavated soil in the RSY is an iterative process that may involve soil characterization and remediation, if appropriate, prior to the actual FSS activities. The processing of excavated soil begins after the transfer of the excavated material from the trenches to the RSY. The excavated soil transfer process is detailed below Transfer of Excavated Soil for Processing Prior to the excavation of any soil, the excavation supervisor (or designee) will contact the RSY Manager (or designee) to determine which RSY screening pad will be used and so that a unique ES survey unit number can be assigned. Excavated soil entering the RSY must be accompanied by a truck ticket to facilitate transfer of the material for radiological processing. This ticket will provide the RSY staff with the following information: Work area (location of excavation) Trench segment identification number Load number Volume of soil Date/time of excavation Associated IR Program site (00 for non-chemically impacted soils) Notes on any odor or visible chemical contamination Because excavated soil removed from within an identified IR Program site typically will be managed separately from non-ir Program sites and to facilitate returning radiologically surveyed and released soil to the general area from which it was excavated, it is imperative that the appropriate information is provided on each truck ticket. After the RSY staff reviews the truck ticket to ensure the proper information is provided, the RSY staff will direct the driver to the appropriate screening pad for soil placement. No soil will be accepted from trucks without a completed truck ticket. The RSY staff will return the truck RMAC Fn Execution Plan.doc 2-4 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

21 ticket and will identify the assigned screening pad and a unique ES survey unit identification number for tracking purposes. Placement of soil on a screening pad in the RSYs will continue until one of the following occurs: The excavation supervisor (or designee) notifies the RSY Manager (or designee) that no additional soils from the associated IR Program site will be generated. The excavation supervisor (or designee) notifies the RSY Manager (or designee) that no additional soils will be generated from an associated WA. The soil placed on the screening pad reaches capacity as identified by the RSY Manager (or designee) and is ready for processing. To facilitate radiological processing, excavated soil is spread out on the screening pads in lifts approximately 6 inches in height and up to 1,000 square meters in surface area. Throughout processing, ES survey units are visually inspected for staining or odors. Soil that emits odors or is stained will be segregated for further sampling and analysis in accordance with the SAP (Attachment 1). As necessary, the soil spread on the screening pads will be allowed to dewater before radiological surveys are initiated. Water collected from the screening pads will be characterized for chemical and radiological constituents, prior to proper disposal. Wastewater sampling will be conducted according to procedures detailed in the SAP (Attachment 1) Gamma Scan Surveys of Excavated Soil Survey Units Each ES survey unit will undergo a 100 percent radiological surface survey using a towed array survey consisting of a high-density gamma scan supported by global positioning system equipment or other Radiological Affairs Support Office (RASO)-approved scanning instruments, as detailed in the Basewide Radiological Management Plan (TtEC 2012a). Data obtained during the surface gamma scan surveys will be analyzed as the data are received. Following data analysis, areas where surface radiation levels appear to be greater than 3-sigma of the mean reference (background) level (or other RASO-approved investigation level) will be noted on a grid map and flagged in the field for verification. Radioactive material, such as point sources, identified during surface scans will be collected, segregated, and stored in appropriate containers in accordance with the Basewide Radiological Management Plan (TtEC 2012a) and the Waste Management Plan (Attachment 6). Manual scans using a hand-held instrument may be performed to further delineate suspected contaminated areas on the screening pads. The instruments, calibration, maintenance, testing, and inspection activities are listed in Worksheet #22 of the SAP (Attachment 1). Biased soil samples may be collected, as directed by the Radiation Safety Officer (RSO) or designee, to establish the presence and extent of radiological contamination within an ES survey unit. Soil RMAC Fn Execution Plan.doc 2-5 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

22 sampling procedures are described in Worksheet #14 of the SAP (Attachment 1). Collected biased samples will be transferred to the Curtis and Tompkins satellite laboratory under chain-ofcustody procedures as identified in Worksheet #27 of the SAP (Attachment 1) for analysis by gamma spectroscopy. Sandblast grit, bottles, jars, and/or other unidentified containers found during radiological processing in the RSYs will be handled in accordance with the most current RASO-approved work instruction or SOP specifically written to govern these materials Systematic Screening Sampling and Remediation Following the completion of the scan surveys, the entire area of each ES survey unit processed in the RSY will be plotted using the most current version of Visual Sample Plan (VSP) software. Typically, 18 systematic soil samples will be collected based on sample spacing using Equation 4-2 from the Basewide Radiological Management Plan (TtEC 2012a) and the most current version of VSP software. Biased samples to verify the potential presence of contamination will be plotted based on the results of the scan survey, as appropriate. Sample collection methodology and sample numbering procedures are described in the SAP (Attachment 1). The 18 systematic and biased soil samples collected from each ES survey unit are submitted to the Curtis and Tompkins satellite laboratory for screening analysis using gamma spectroscopy under chain of custody as described in Worksheet #27 of the SAP. If radiological contamination is identified in the systematic and/or biased soil samples, remediation will be performed for the associated ES survey unit. The extent of the remediation area is bounded by those samples that do not exceed the release criteria. Additional characterization will be performed, as necessary, to reduce the volume of soil placed in low-level radioactive waste (LLRW) bins for off-site disposal. Following remediation, 18 systematic soil samples will be plotted using VSP and collected followed by laboratory analysis. This iterative process will continue until no contamination is identified in the sample results or until three phases of 18 systematic soil samples have been collected and analyzed with continued radiological contamination found in the third phase of sample results. ES survey units that have undergone three phases of systematic sampling and analysis with continued radiological contamination identified in the third phase may be disposed of in their entirety as LLRW with the concurrence of the RASO. Soil samples collected from ES survey units and analyzed by the Curtis and Tompkins satellite laboratory that indicate concentrations of Cs-137 at or above its release criterion will be analyzed by the TestAmerica St. Louis laboratory (TestAmerica St. Louis), a DoD ELAP and CDPH NELAP accredited laboratory for total strontium or Sr-90. If the laboratory results indicate the presence of total strontium or Sr-90 concentrations at or above the release criterion, additional analysis for isotopic plutonium and uranium may be performed. RMAC Fn Execution Plan.doc 2-6 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

23 To facilitate operation of the RSY, the ES survey unit screening analytical data will be provided to the RASO with a request for concurrence to stage the material in the stockpile area designated by the DON CSO pending receipt of the definitive data from Curtis and Tompkins satellite laboratory. No excavated soil will be removed from the RSYs without the RASO s concurrence. Once concurrence from the RASO is received, the affected ES survey unit will be transferred to the stockpile area and marked with its unique ES survey unit number and applicable IR Program site designation. The locations and status of each ES survey unit will be tracked in the TtEC database management program Excavated Soil Survey Units With the RASO s concurrence that the ES survey unit can be staged pending receipt of the definitive data, the final 18 ES survey unit systematic soil samples will be reanalyzed by gamma spectroscopy after bismuth-214 (Bi-214) approaches secular equilibrium with Ra-226 (typically 21 days) for definitive analysis under chain-of-custody procedures as identified in Worksheet #27 of the SAP (Attachment 1). Once the definitive data (including chemical results, as applicable) are received and reviewed, TtEC will determine whether the soil meets the release criteria or if additional remediation is required. The definitive data will be sent to the RASO for concurrence to 1) use the soil as backfill material, or 2) stage the ES survey unit pending off-site disposal as non-llrw or LLRW (if additional contamination is identified) by the appropriate DON waste contractors. TtEC will be responsible for third-party data validation of the Curtis and Tompkins satellite laboratory and TestAmerica St. Louis results (except waste classification data) associated with each ES survey unit. Data validation will be performed in accordance with Worksheet #29 of the SAP (Attachment 1) Waste Classification Sampling Excavated soil derived from IR Program sites will be generated during field activities and will require sampling for proper classification. Waste characterization and disposal are not included in the current scope for TtEC, but chemical sampling of excavated IR Program site soils to determine suitability for use as backfill material is required. Excavated soil generated from IR Program sites will be sampled and analyzed for the associated chemicals of concern. Sampling and analysis for each IR Program site will be performed as identified in Worksheet #17 of the SAP (Attachment 1). Based on chemical sampling analytical results, material not suitable for backfill may be consolidated for off-site disposal once the ES survey unit has been radiologically free released. Radiologically surveyed and released ES survey units derived from IR Program site soils that meet the chemical sampling analytical criteria may be used as backfill. RMAC Fn Execution Plan.doc 2-7 Final Parcel C Phase II Execution Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO No. 0012

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26 Base Realignment and Closure Program Management Office West 1455 Frazee Road, Suite 900 San Diego, California CONTRACT NO. N D-0809 CTO NO FINAL DESIGN PLAN DCN: RMAC November 2012 PARCEL C PHASE II RADIOLOGICAL REMEDIATION AND SUPPORT HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CALIFORNIA

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28 TABLE OF CONTENTS PAGE ABBREVIATIONS AND ACRONYMS... iii 1.0 INTRODUCTION SYSTEM DESCRIPTION BACKGROUND PARCEL C STORM DRAIN AND SANITARY SEWER SYSTEMS FIELDWORK IMPLEMENTATION PERMITS AND NOTIFICATIONS ENVIRONMENTAL RESOURCES SURVEY VEGETATION REMOVAL GEOPHYSICAL SURVEY MOBILIZATION EXCAVATION AND SYSTEM REMOVAL Installation Restoration Site Integration Excavation Approach STORMWATER, SEDIMENT, AND EROSION CONTROL RADIOLOGICAL SURVEYS AND SAMPLING FINAL STATUS SURVEYS TRENCH BACKFILL SITE RESTORATION DECONTAMINATION AND FREE-RELEASE SURVEYS WASTE CLASSIFICATION, STORAGE, AND DISPOSAL DEMOBILIZATION REFERENCES TABLES Table 3-1 Groundwater Monitoring Wells Potentially Affected by Phase II Storm Drain and Sanitary Sewer Removal FIGURES Figure 1-1 Work Area Location Map RMAC Parcel C Phase II Design Plan.doc i Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

29 TABLE OF CONTENTS (Continued) APPENDICES Appendix A Appendix B Appendix C Design Drawings Construction Specifications Hunters Point Shipyard Project Backfill Review and Acceptance Procedure RMAC Parcel C Phase II Design Plan.doc ii Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

30 ABBREVIATIONS AND ACRONYMS BRAC COC CSO CTO DON EP ES HPNS IR PAH PCB RASO RPM SFRA SVOC TOG TPH TPH-d TPH-e TPH-g TPH-mo TPH-p Triple A TRPH VOC WA Base Realignment and Closure chemical of concern Caretaker Site Office Contract Task Order Department of the Navy extraneous pipe excavated soil Hunters Point Naval Shipyard Installation Restoration (Program) polynuclear aromatic hydrocarbon polychlorinated biphenyl Radiological Affairs Support Office Remedial Project Manager San Francisco Redevelopment Agency semivolatile organic compound total oil and grease total petroleum hydrocarbons total petroleum hydrocarbons quantified as diesel total petroleum hydrocarbons extractable total petroleum hydrocarbons quantified as gasoline total petroleum hydrocarbons quantified as motor oil total petroleum hydrocarbons purgeable Triple A Machine Shop, Inc. total recoverable petroleum hydrocarbons volatile organic compound Work Area RMAC Parcel C Phase II Design Plan.doc iii Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

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32 1.0 INTRODUCTION This Design Plan describes the scope and approach for storm drain and sanitary sewer removal in Parcel C Phase II Work Areas (WA)-31, WA-33, WA-34, and WA-35 (Figure 1-1) at Hunters Point Naval Shipyard (HPNS) in San Francisco, California. The Department of the Navy (DON), Naval Facilities Engineering Command Southwest and the Radiological Affairs Support Office (RASO) are directing this removal action. A total of 22,917 linear feet of storm drain and sanitary sewer lines was removed within Parcel C under Contract No. N D-0809, Contract Task Order (CTO) No Removal of the remaining approximately 14,300 linear feet will be executed under CTO No.0012 under the same contract. HPNS is located in the southeastern part of San Francisco on a long promontory that extends east into San Francisco Bay. Presently, HPNS encompasses approximately 866 acres, including approximately 420 acres on land. The land portion of HPNS was purchased by the DON in 1939 and leased to Bethlehem Steel Corporation. At the start of World War II in 1941, the DON took possession of the property and operated it as a shipbuilding, repair, and maintenance facility until 1974 when the DON deactivated HPNS. From 1976 to 1986, the DON leased HPNS to Triple A Machine Shop, Inc. (Triple A), a private ship repair company. In 1986, Triple A ceased operations and the DON resumed occupancy through In 1991, HPNS was placed on the DON s Base Realignment and Closure (BRAC) list, and its mission as a DON shipyard ended in April A 1998 BRAC decision requires full closure and cleanup of HPNS. Essentially, this entails removal of buildings and structures, including subsurface systems, as well as removal of contaminated materials. HPNS was divided into 12 parcels: A, B, C, D-1, D-2, E, E-2, F, G, UC1, UC2, and UC3. Parcel A, consisting of the most inland 75 acres, was transferred to the San Francisco Redevelopment Agency (SFRA) in The remainder of HPNS will be conveyed to the SFRA once the environmental cleanup is complete. This Design Plan will be implemented in accordance with the construction, radiological screening, waste management, and site restoration strategies defined in the Basewide Radiological Management Plan (TtEC 2012a). This Design Plan addresses the project-specific requirements and includes detailed design drawings and technical specifications (Appendices A and B, respectively) for performing the removal action at Parcel C Phase II. Exceptions to the approach and procedures delineated in the Basewide Radiological Management Plan, if any, are identified in this Design Plan. If, over the course of the project, the Basewide Radiological Management Plan is updated, the most current revision will supersede the older version. RMAC Parcel C Phase II Design Plan.doc 1-1 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

33 This Design Plan is organized as follows: Section 1.0 Introduction provides project background information and describes the relationship between this Design Plan and the Basewide Radiological Management Plan (TtEC 2012a). Section 2.0 System Description describes the Parcel C storm drain and sanitary sewer systems. Section 3.0 Fieldwork Implementation describes the fieldwork scope, procedures, and methods applicable to the storm drain and sanitary sewer removal action in WA-31, WA-33, WA-34, and WA-35. The detailed information in Section 3.0 supplements the information provided in Section 5.0 of Attachment 1, Basewide Storm Drain and Sanitary Sewer Removal Plan, to the Basewide Radiological Management Plan (TtEC 2012a). Section 4.0 References lists the references cited in this Design Plan. Appendix A Design Drawings. Appendix B Construction Specifications. Appendix C Hunters Point Shipyard Project Backfill Review and Acceptance Procedure. RMAC Parcel C Phase II Design Plan.doc 1-2 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

34 2.0 SYSTEM DESCRIPTION 2.1 BACKGROUND Until 1958, the storm drain and sanitary sewer systems at HPNS were combined. All flow through the systems was directed to outfalls that discharged to San Francisco Bay. In 1958, the first of three separation projects was completed. The separation projects provided for installation of dedicated sanitary sewer piping and pump stations that discharged sanitary sewer effluent offsite to a publicly owned treatment works operated by the City and County of San Francisco. The last of these projects was completed in To varying degrees, each of the three separation projects involved work within Parcels C and D; however, inspection of the systems has revealed that some cross-connections between the two systems may still exist. 2.2 PARCEL C STORM DRAIN AND SANITARY SEWER SYSTEMS The design drawings (Appendix A) identify the storm drain and sanitary sewer systems to be removed under this plan and provide information on pipe size, flow direction, material type, and length. The identification numbers assigned to each system component and trench will be used for tracking purposes during the removal action. The system description provided above and detailed in the design drawings is based on the 1995 engineering drawings provided by the DON. In some cases, other sources of historical data may provide differing details regarding system construction and configuration. Actual conditions will be verified in the field and taken into account during the removal action. Deviations from the details provided in this Design Plan will be documented in the post-excavation reports. Existing topographic data for the WAs are available in the HPNS, San Francisco, California Base Map (44 Sheets) dated November 1, 1993 (Gahagan and Brian 1993). These data are adequate to begin the storm drain and sanitary sewer line removal action, and preconstruction surveys will not be required. RMAC Parcel C Phase II Design Plan.doc 2-1 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

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36 3.0 FIELDWORK IMPLEMENTATION This section describes the scope, procedures, and methods applicable to preparing for and executing the fieldwork. The fieldwork will encompass the items listed below and as described in this section: Permits and notifications Environmental resources survey Vegetation removal Geophysical survey Mobilization Excavation and system removal Stormwater, sediment, and erosion control Radiological surveys and sampling Final Status Surveys Trench backfill Site restoration Decontamination and free-release surveys Waste classification, storage, and disposal Demobilization 3.1 PERMITS AND NOTIFICATIONS Permitting and notification requirements are defined in the Basewide Radiological Management Plan (TtEC 2012a). Stormwater management will comply with the General Construction Activity Stormwater Permit program set forth by the California Regional Water Quality Control Board General Permit No. CAS000002, Water Discharge Requirements for Discharges of Storm Water Runoff Associated with Construction Activity. Details of the stormwater protection can be found in the Stormwater Pollution Prevention Plan provided as Attachment 5 to the Execution Plan (TtEC 2012b). Tetra Tech EC, Inc., will maintain a current annual excavation permit from the California Occupational Safety and Health Administration, and the 5-day notification requirement will be fulfilled before excavation begins. Underground Service Alert ( ) will be notified before intrusive activities are begun. RMAC Parcel C Phase II Design Plan.doc 3-1 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

37 Portions of the excavation will be inside state-recognized archaeologically sensitive zones. Notification to the State Historical Preservation Office is required. Details of the notification requirements are presented in the Basewide Archaeological Monitoring and Discovery Plan (TtEC 2012c). Because the removal action will be conducted along well-traveled streets, the Remedial Project Manager (RPM), Caretaker Site Office (CSO), Resident Officer in Charge of Construction, HPNS tenants, and HPNS security will be notified of any road closures and changes to traffic flow that will be necessary to support the work. 3.2 ENVIRONMENTAL RESOURCES SURVEY An environmental resources survey will be completed prior to mobilizing. Because the removal action will be confined to the asphalt-paved streets of an industrial area, no impact to sensitive habitats or special-status species is anticipated, and long-term monitoring during construction is not currently planned. 3.3 VEGETATION REMOVAL Limited areas of vegetation exist within the planned WAs. The vegetation will be cleared from the affected area prior to beginning intrusive activities. 3.4 GEOPHYSICAL SURVEY Prior to the initiation of intrusive activities, a records review will be performed and a geophysical survey will be conducted to identify utilities in the WA. Active utilities identified during the geophysical survey will be isolated or otherwise protected from being damaged, as necessary. 3.5 MOBILIZATION Mobilization activities will include site preparation, transfer of equipment and material to the work site, and orientation and training of field personnel. Prior to mobilization, the appropriate DON personnel, including the RPM, RASO, and CSO, will be notified regarding the planned schedule. 3.6 EXCAVATION AND SYSTEM REMOVAL The project site for this Design Plan is divided into four WAs: WA-31, WA-33, WA-34, and WA-35. The piping in WA-32 was completely removed under CTO No The design drawings in Appendix A identify the piping and system components to be removed during Phase II. The following estimates apply: RMAC Parcel C Phase II Design Plan.doc 3-2 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

38 The piping and system components to be removed total approximately 14,131 linear feet (1,497 in WA-31, 5,861 in WA-33, 3,221 in WA-34, and 3,552 in WA-35). If additional piping is encountered, this piping will be removed until the scoped linear footage of 14,300 is obtained. Excavation depths are expected to range between approximately 3 to 18 feet below ground surface. A majority of the remaining storm drain and sanitary sewer piping within Parcel C will be removed under this Design Plan. However, limited piping may be left in place permanently or addressed at a later date: Piping under the footprint of radiologically impacted buildings and outdoor areas will be evaluated as part of characterizing each building/area and will not be removed under this Design Plan. These pipe segments are identified in Appendix A. Removal activities will be terminated 10 feet from the impacted building. Piping laterals originating at non-radiologically impacted buildings will initially be removed only within the first 10 feet of their union with a main trunk line. If no radiological contamination is present in this segment of the line, the exposed ends of the lateral will be capped or plugged and the remaining portions left in place. If evidence of radiological contamination is encountered, the remaining lateral will be removed in 10-foot sections until the line is determined to be free of radioactive contamination or until the face of an existing building is encountered, whichever comes first. This approach will be used in areas where excavations will not affect return access if pipe samples are elevated. Work activities to be performed will follow the processes or procedures identified in the Basewide Radiological Management Plan (TtEC 2012a). First, the asphalt and road base material in the vicinity of the storm drain and sanitary sewer line excavation activities will be removed and stockpiled for reuse during site restoration activities to the maximum extent practicable. This material will be stockpiled within Parcel C at a location designated by the DON. Because the surface streets are not radiologically impacted, no initial surface scan is required before this road material is removed. After removal of the surface paving, the soil overlying each storm drain and sanitary sewer line (the excavated soil [ES]) will be removed and transported to the designated radiological screening yard for subsequent survey and sampling activities. Soil that meets the criteria specified in the Sampling and Analysis Plan provided as Attachment 1 to the Execution Plan (TtEC 2012b) may be reused as backfill material. Soil that does not meet the specified criteria will be disposed of by the DON waste disposal contractor. RMAC Parcel C Phase II Design Plan.doc 3-3 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

39 To the extent practicable, the trench sidewalls will be cut vertically to minimize the quantity of soil to be handled, scanned, and sampled. No one will be allowed into the trenches unless it is deemed safe by a designated competent person. Following removal of the ES, the storm drain and sanitary sewer pipelines will be removed. The pipes will be removed intact and stockpiled separately. If the piping cannot be extracted separately, as may be the case for terracotta pipe, the piping will be stockpiled, sampled, and surveyed as ES. Excavated piping will be considered radiologically contaminated until survey and sampling data prove otherwise, and it shall be controlled as radiologically contaminated material and handled accordingly. If sufficient material is present within these components, sediment and solid samples will be collected and analyzed in accordance with the Basewide Radiological Management Plan (TtEC 2012a). Open sewer or storm drain lines left in place during the removal process will be plugged to prevent water from entering or exiting pipes and to eliminate the release of any contamination that may be present in the lines. In no case will sediments from removal or installation work be allowed to enter the San Francisco Bay. Previously unidentified extraneous pipes (EPs) may be encountered within the limits of the trench excavations. EPs with the historical potential to have carried fluids will be identified and marked. These EPs will be tapped and scanned for radiological contamination and, if sediment or solid material is present in sufficient quantity, a sample will be collected for radiological analysis. Swipe samples will be collected from the interior surfaces of the EPs and analyzed for radiological contamination. If contamination is identified, the EPs will be removed. Uncontaminated EPs and non-fluid-bearing lines will be identified on the record drawings but left in place. There are 23 groundwater monitoring wells within Parcel C Phase II that are proximate to planned excavations and, as a result, may be at risk of loss or damage during pipe removal activities. The IDs for these wells are listed in Table 3-1. Based on the existing utility maps, no wells were found to be at risk in WA-31. RMAC Parcel C Phase II Design Plan.doc 3-4 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

40 TABLE 3-1 GROUNDWATER MONITORING WELLS POTENTIALLY AFFECTED BY PHASE II STORM DRAIN AND SANITARY SEWER REMOVAL Well ID Work Area Northing Easting IR28MW150A IR28MW171A IR28MW171B IR28MW200A IR28MW201F IR28MW298A IR29MW48A IR29MW56F IR29MW59F IR50MW13F PA50MW04A IR28MW221A IR28MW221B IR28MW353B PA50MW03A IR06MW34A IR06MW42A IR06MW47F IR06SG IR06SG IR06SG IR06SG IR64MW05A All efforts will be made to ensure that these groundwater monitoring wells and vapor monitoring points remain intact. If the storm drain and sanitary sewer pipe removal activities will adversely impact them, the DON will be notified. Well destruction and reinstallation are not part of this scope of work Installation Restoration Site Integration Storm drain and sanitary sewer removal in Parcel C Phase II encompasses part of nine Installation Restoration (IR) Program sites, the limits of which are shown on the Appendix A RMAC Parcel C Phase II Design Plan.doc 3-5 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

41 drawings. The nonradiological chemicals of concern (COCs) for these sites have been identified as follows: WA-31 IR-57. Metals, polychlorinated biphenyls (PCBs), semivolatile organic compounds (SVOCs), total oil and grease (TOG), total petroleum hydrocarbons (TPH) quantified as diesel (TPH-d), volatile organic compounds (VOCs), and waste oil WA-33 IR-28. Metals, polynuclear aromatic hydrocarbons (PAHs) PCBs, pesticides, SVOCs, TOG, TPH-d, TPH quantified as gasoline (TPH-g), TPH quantified as motor oil (TPH-mo), TPH quantified as purgeable unknown hydrocarbons (TPHp), and VOCs IR-29. Metals, PAHs, PCBs, pesticides, SVOCs, TOG, TPH-d, TPH quantified as extractable unknown hydrocarbons (TPH-e), TPH-p, and VOCs WA-34 IR-28. See WA-33. WA-35 IR-06. Metals, PAHs, PCBs, SVOCs, TOG, TPH-d, TPH-g, and VOCs IR-10. Metals, PAHs, PCBs, pesticides, SVOCs, TOG, TPH-d, TPH-g, total recoverable petroleum hydrocarbons (TRPH), and VOCs IR-24. Metals, PCBs, SVOCs, TOG, TPH-d, TPH-e, TPH-g, TPH-p, and VOCs IR-25. Metals, PAHs, PCBs, TOG, TPH-d, TPH-e, TPH-mo, TPH-p, and VOCs IR-27. Metals, SVOCs, TOG, TPH-d, and TPH-g IR-58. Metals, PAHs, PCBs, pesticides, SVOCs, TOG, TPH-d, TPH-e, TPH-p, and VOCs COC-specific sampling and analysis will be performed on non-radiologically affected soil in accordance with the Sampling and Analysis Plan provided as Attachment 1 to the Execution Plan (TtEC 2012b) to assess the soil s suitability for reuse Excavation Approach The excavation approach identified in the Basewide Radiological Management Plan (TtEC 2012a) will be followed for the activities in Parcel C Phase II. No exceptions are anticipated. RMAC Parcel C Phase II Design Plan.doc 3-6 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

42 3.7 STORMWATER, SEDIMENT, AND EROSION CONTROL Stormwater, sediment, and erosion controls will comply with the Stormwater Pollution Prevention Plan provided as Attachment 5 to the Execution Plan (TtEC 2012b) and attached Specification (Appendix B). To facilitate drainage of the WAs, 1,500 linear feet of swales will be constructed to direct stormwater to existing outfalls in Parcel C. The swale engineering details are provided in Appendix A. The surface swales for Phase II tie into the surface swales constructed during Phase I. 3.8 RADIOLOGICAL SURVEYS AND SAMPLING The radiological survey and sampling protocols for excavation and the excavated material, which are specified in the Basewide Radiological Management Plan (TtEC 2012a) and Sampling and Analysis Plan provided as Attachment 1 to the Execution Plan (TtEC 2012b), will be followed. No exceptions are anticipated. The potential radionuclides of concern associated with the storm drain and sanitary sewer line activities in Parcel C are expected to be limited to cesium-137, radium-226, and strontium-90. Removal of the storm drain and sanitary sewer lines will be conducted within the footprints of the impacted buildings and sites. The potential radionuclides of concern for the work conducted within the footprints of impacted buildings and sites will be specified in Task-specific Plans developed for these sites and are not covered under this Design Plan. Radiological survey and sampling will be conducted in accordance with Task-specific Plans. 3.9 FINAL STATUS SURVEYS The Final Status Survey and sampling requirements identified in the Basewide Radiological Management Plan (TtEC 2012a) will be followed. No exceptions are anticipated TRENCH BACKFILL Backfilling will begin only when the results of the radiological surveys and sampling activities confirm that no contamination is present above the radiological remedial objectives and RASO concurrence is obtained. Backfill material sources and placement, including compaction, will conform to the requirements of the Basewide Radiological Management Plan (TtEC 2012a) and attached Specification (Appendix B). No exceptions to the procedures specified in the current Basewide Radiological Management Plan are anticipated SITE RESTORATION Restoration will be performed to bring trench surfaces back to grade. Erosion and dust control measures will be employed to ensure a stable finished surface. These may consist of capping RMAC Parcel C Phase II Design Plan.doc 3-7 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

43 with gravel/recycled asphalt, revegetation, or paving. Future stormwater will be collected and directed to outfalls via temporary swales. No other restoration activities are planned DECONTAMINATION AND FREE-RELEASE SURVEYS Free-release survey activities are specified in the Basewide Radiological Management Plan (TtEC 2012a). No exceptions are anticipated WASTE CLASSIFICATION, STORAGE, AND DISPOSAL Waste materials generated as a result of the removal action will be managed in accordance with Waste Management Plan provided as Attachment 6 to the Execution Plan (TtEC 2012b). No exceptions are anticipated DEMOBILIZATION Upon completion and acceptance of the fieldwork, the radiological contractor will demobilize from the site in accordance with the methods and standards specified in the Basewide Radiological Management Plan (TtEC 2012a). No exceptions are anticipated. RMAC Parcel C Phase II Design Plan.doc 3-8 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

44 4.0 REFERENCES Gahagan and Brian Hunters Point Naval Shipyard, San Francisco, California Base Map. 44 sheets. Prepared for the DON Western Division. November 1. TtEC (Tetra Tech EC, Inc.). 2012a. Basewide Radiological Management Plan, Hunters Point Naval Shipyard, San Francisco, California. February b. Execution Plan, Parcel C Phase II Radiological Remediation and Support, Hunters Point Naval Shipyard, San Francisco, California. November c. Basewide Archaeological Monitoring and Discovery Plan, Hunters Point Naval Shipyard, San Francisco, California. In Process. RMAC Parcel C Phase II Design Plan.doc 4-1 Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

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46 FIGURES RMAC Parcel C Phase II Design Plan.doc Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

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48 P:\CTO-12 CAD Files (Rad EMAC)\Work Areas\CTO12_WA-Fig 1-1.dwg 7/31/12 BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN RADIOLOGICAL REMEDIATION AND SUPPORT FIGURE 1-1 WORK AREA LOCATION MAP HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA

49 APPENDIX A DESIGN DRAWINGS RMAC Parcel C Phase II Design Plan.doc Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

51 MATCH LINE SEE SHEET 2 OF 3 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 31 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA PARCEL C ENLARGED AREA B A TRENCH ID XX-XXX-XX-XX

52 MATCH LINE SEE SHEET 1 OF 3 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 31 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA MATCH LINE SEE SHEET 3 OF 3 PARCEL C ENLARGED AREA B A TRENCH ID XX-XXX-XX-XX

53 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 31 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA PARCEL C ENLARGED AREA B A TRENCH ID XX-XXX-XX-XX MATCH LINE SEE SHEET 2 OF 3

55 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA MATCH LINE SEE SHEET 4 OF 4 PARCEL C ENLARGED AREA B A TRENCH ID MATCH LINE SEE SHEET 1 OF 4 PARCEL C PHASE II DESIGN PLAN RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 33 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA XX-XXX-XX-XX

61 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA MATCH LINE SEE SHEET 2 0F 4 PARCEL C ENLARGED AREA B A TRENCH ID MATCH LINE SEE SHEET 3 OF 4 PARCEL C PHASE II DESIGN PLAN RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 34 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA XX-XXX-XX-XX

62 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 35 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA MATCH LINE SEE SHEET 2 OF 4 ENLARGED AREA PARCEL C B A TRENCH ID XX-XXX-XX-XX

63 MATCH LINE SEE SHEET 3 OF 4 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 35 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA MATCH LINE SEE SHEET 1 OF 4 ENLARGED AREA PARCEL C B A TRENCH ID XX-XXX-XX-XX

64 MATCH LINE SEE SHEET 2 OF 4 MATCH LINE SEE SHEET 4 OF 4 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 35 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA ENLARGED AREA PARCEL C B A TRENCH ID XX-XXX-XX-XX

65 MATCH LINE SEE SHEET 3 OF 4 PARCEL C PHASE II DESIGN PLAN HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA RADIOLOGICAL REMEDIATION AND SUPPORT WORK AREA 35 HUNTERS POINT NAVAL SHIPYARD SAN FRANCISCO, CA ENLARGED AREA PARCEL C B A TRENCH ID XX-XXX-XX-XX

66

67 CALCULATION COVER SHEET (Continued) PAGE 2 OF 19 REVISION HISTORY Rev No. Affected Pages Description of Change Technical Basis for Change 0 All Original Calculation Original Calculation

68 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 3 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN TABLE OF CONTENTS TABLE OF CONTENTS INTRODUCTION AND PURPOSE ACCEPTANCE CRITERIA RESULTS SUMMARY INPUTS CODES, STANDARDS, AND REGULATIONS LITERATURE DATA DESIGN INPUTS OTHER INPUTS ASSUMPTIONS METHODOLOGY REFERENCES CALCULATION DETAILS FIGURES Figure 1 Proposed Swale Layout Figure 2 Swale Detail 1 of 4 Figure 3 Swale Detail 2 of 4 Figure 4 Swale Detail 3 of 4 Figure 5 Swale Detail 4 of 4 Figure 6 Drainage Areas 3 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

69 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 4 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN 1.0 INTRODUCTION AND PURPOSE The existing sanitary sewer and storm drain lines on Blandy St and Lockwood St, Hunters Point Naval Shipyard, San Francisco, California will be removed as part of the removal action by Tetra Tech EC, Inc (TtEC) as detailed in the Parcel C Phase II Radiological Removal and Support Design Plan (TtEC 2012). In order to provide replacement drainage, TtEC is proposing to install drainage swales along Blandy St and Lockwood St (see Figure 1). The scope of this calculation includes the design of the drainage swales to be installed along Blandy St and Lockwood St to facilitate drainage. 2.0 ACCEPTANCE CRITERIA Peak flow is estimated using the rational formula. The discharge rate is computed based on the Manning s equation. If the drainage swale or pipe full flow capacity is equal to or larger than the estimated peak flow, the drainage swale or pipe sizing is considered acceptable. 3.0 RESULTS SUMMARY Two drainage swales were designed to drain Blandy St and Lockwood St (see Figure 1). Perforated or elbow pipes will be installed at the end of each swale to divert the water to existing active outfalls. Details of the drainage swales and underground piping are shown in Figures 2 through 5. Figure 6 shows the drainage areas for each swale. Drainage Swale and Underground Pipe Dimensions: Drainage Swale Tributary Drainage Area(ft 2 ) PeakFlow Rate(ft 3 /s) Drainage Swales Minimum Slope Bottomof SwaleWidth (ft) Topof Swale Width(ft) Swale Depth (ft) Swale Capacity (ft 3 /s) % % Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

70 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 5 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN Minimum Slope Numberof pipespipe Diameter(in) Pipes PipeFlow Capacity (ft 3 /s) PeakFlow Rate(ft 3 /s) 1.00% 124" INPUTS 4.1 CODES, STANDARDS, AND REGULATIONS Caltrans Highway Design Manual Open Channels (2006) Federal Highway Administration (FHWA) Design of Roadside Channels (2005) San Francisco Public Utility Commission (SFPUC) Stormwater Design Guidelines (2010) 4.2 LITERATURE DATA No literature data was used. 4.3 DESIGN INPUTS The up-gradient Water Quality Flow Rate WQ f (ft 3 /sec) of Parcel C Phase I and Parcel C Phase II was used to determine the size of each drainage swale. The swales along Blandy St and Lockwood St will have a bottom slope of 0.1% and 0.15% respectively. Since the drainage swales will drain paved areas with an impervious Runoff Coefficient of 0.8 and the buildings with an impervious Runoff Coefficient of 0.85, a composite Runoff Coefficient of was used. Based on the data of previous years, the average rainfall intensity (i) for a ten year storm for San Francisco is 1.72 in/hr (Golden Gate Weather Services 2009). 4.4 OTHER INPUTS No other design inputs were used 5 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

71 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 6 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN 4.5 ASSUMPTIONS The areas used to estimate the flow rate for each section of the swale are based on the existing topography and previous drainage system in the area. Flow into the existing active drainage system is governed by gravity flow and backflow from high tide conditions is minimal due to the elevation difference between the tie-in point (see Figure 1) and the outfall to San Francisco Bay. Therefore, backflow/cross contamination at the tie-in point is not expected. 5.0 METHODOLOGY The methodology used for designing the swales along Blandy St and Lockwood St was obtained from the Caltrans Highway Design Manual, SFPUC Stormwater Design Guidelines, and the FHWA Design of Roadside Channels. The locations of the swales were determined based on an initial study of the topography of the road and previous drain locations along Blandy St and Lockwood St. See Figure 1 for the locations of the swales. The WQ f was calculated using the following equation from the SFPUC Stormwater Design Guidelines: Where: WQ f = Water Quality Flow Rate (ft 3 /sec) C c = Composite Runoff Coefficient, which is the weighted average of all the C-factors for all the surfaces in the drainage area. i = Average Rainfall Intensity is equal to twice or more of the 85 th percentile hourly depth (in/hr). A = Drainage Area is obtained by measuring the areas that would have runoff upgradient of each Drainage Swale (ft 2 ) (see Figure 6) The Drainage Swales and Pipes were designed using the Manning s Equation: 6 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

72 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 7 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN Where: Q f = Design water flow rate passing through the stretch of swale (ft 3 /sec) A = Cross-sectional area of flow perpendicular to the flow direction (ft 2 ) S = Bottom slope of swale n = Manning roughness coefficient R = Hydraulic Radius (ft) The cross-sectional areas of the swales or pipes were calculated using the following formulas: For the Drainage Swales For the Pipes Where: A = Cross-sectional area of flow perpendicular to the flow direction (ft 2 ) H = Swale flow depth (ft) W t = Swale top width (ft) W b = Swale bottom width (ft) r = Pipe radius (ft) The wetted perimeters of the swales and the pipes were calculated by summing the length of surfaces of the swales or the pipes that will be dampened: For the Drainage Swales For the Pipes Where: P = Wetted perimeter of the swales or pipes (ft) H = Swale flow depth (ft) W b = Swale bottom width (ft) W t = Swale top width (ft) r = Pipe Radius (ft) The hydraulic radius is a measurement of the flow efficiency and can be calculated by: Where: R = Hydraulic Radius (ft) A = Cross-sectional area of flow perpendicular to the flow direction (ft 2 ) 7 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

73 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 8 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN P = Wetted perimeter of the swale (ft) The shear stress on the rock from the stormwater in the swale was also evaluated to ensure the stormwater flow will not dislodge the rock. The maximum shear stress from the stormwater is calculated using the following equation from the FHWA Design of Roadside Channels: Where: d = Shear stress in the swale at maximum depth (psf) w = Specific weight of water (62.4 lbf/ft 3 ) D = Depth of flow (ft) S = Bottom slope of swale The allowable shear stress the rock can handle is calculated from the following equation from the FHWA Design of Roadside Channels: Where: rock= Allowable shear stress (psf) F X = Shield s parameter s = Specific weight of the rock(lbf/ft 3 ) w = Specific weight of water (62.4 lbf/ft 3 ) D 50 = Mean rock size (in) 8 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

74 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 9 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN 6.0 REFERENCES Caltrans Highway Design Manual Chapter 860 Open Channels. FHWA (Federal Highway Administration) Design of Roadside Channels with Flexible Linings Hydraulic Engineering Circular (HEC) Number 15, Third Edition. Golden Gate Weather Service Climate of San Francisco, Rainfall Return Periods. SFPUC (San Francisco Public Utility Commission) Stormwater Design Guidelines. 9 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

75 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 10 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN 7.0 CALCULATION DETAILS Swale Design for Drainage Area 1: CompositeRunoffCoefficient(C) (0.8forasphaltand0.85forroofs) Drainagearea(A 1 ) squarefeet AverageRainfallIntensity(i) 1.72 inches/hour WaterQualityFlowRate(WQ f )=CxA 1 xi/ Cubicfeetpersecond WaterQualityFlowRate(WQ f )fromparcelcphasei 7.80 Cubicfeetpersecond TotalWaterQualityFlowRate(WQ f ) Cubicfeetpersecond Bottomslopeofswale(S) ManningroughnessCoefficient(n) FlowDepth(H) 2.25 Feet SwaleTopWidth(W t ) Feet SwaleBottomWidth(W b ) 3.00 Feet Swalecrosssectionalarea(A) Squarefeet SwaleWettedperimeter(P) Feet HydraulicRadius(R) 1.29 Feet DesignWaterFlowRate(Q f )=(1.49xAxR 2/3 xs 1/2 )/n Cubicfeetpersecond Swale Design for Drainage Area 2: CompositeRunoffCoefficient(C) (0.8forasphaltand0.85forroofs) Drainagearea(A 2 ) squarefeet AverageRainfallIntensity(i) 1.72 inches/hour WaterQualityFlowRate(WQ f )=CxA 2 xi/ Cubicfeetpersecond WaterQualityFlowRate(WQ f )fromparcelcphasei Cubicfeetpersecond TotalWaterQualityFlowRate(WQ f ) Cubicfeetpersecond Bottomslopeoftheswale(S) ManningroughnessCoefficient(n) FlowDepth(H) 2.00 Feet SwaleTopWidth(W t ) Feet SwaleBottomWidth(W b ) 3.00 Feet Swalecrosssectionalarea(A) Squarefeet SwaleWettedperimeter(P) Feet HydraulicRadius(R) 1.18 Feet DesignWaterFlowRate(Q f )=(1.49xAxR 2/3 xs 1/2 )/n Cubicfeetpersecond 10 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

76 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 11 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN Pipe Sizing: Pipeslope(S) ManningroughnessCoefficient(n) Pipediameter(D) 2.00 Feet Pipecrosssectionalarea(A) 3.14 Squarefeet Pipewettedperimeter(P) 6.28 Feet HydraulicRadius(R) 0.50 Feet DesignWaterFlowRate(Q f )=(1.49xAxR 2/3 xs 1/2 )/n Cubicfeetpersecond A 24-inch smooth corrugated pipe will be used to connect the Drainage Swales to the existing active storm drain lines. For a 24-inch smooth corrugated pipe with a minimum slope of 1%, the flow capacity is 24.6 ft 3 /s, which is greater than the maximum flow rate 20.1 ft 3 /s of Drainage Swale 1. Rock Shear Stress Check: Shear stress at maximum depth: Allowable shear stress: 11 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

77 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 12 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN Since The stormwater flow will not dislodge the drain rock. The 1.5 in drain rock is suitable for use in the swale. 12 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

78 PROJECT: CTO 12 CALC. NO: CALC-CTO REV. 0 DATE: PAGE 13 OF 19 SUBJECT: PARCEL C PHASE II DRAINAGE DESIGN 13 Verify before each use when using uncontrolled printed copy. Copyright 2003 by Tetra Tech EC Incorporated Distribution and use subject to restrictions on cover page.

79 P:\CTO-12 CAD Files (Rad EMAC)\Parcel C Phase II Swale\PARCEL C Phase II_Swale Key Plan_ dwg BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN PROPOSED SWALE LAYOUT FIGURE 1 HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA

80 P:\CTO-12 CAD Files (Rad EMAC)\Parcel C Phase II Swale\PARCEL C Swale Details_ dwg EXISTING SEDIMENT TRAP DETAIL C D LOCKWOOD ST. C EXISTING SWALE SWALE 2 D SWALE 2 EXISTING SWALE SECTION C-C SWALE 2 SECTION D-D BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN SWALE DETAIL 1 of 4 FIGURE 2 HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA.

81 SEDIMENT TRAP DETAIL (TPY.) P:\CTO-12 CAD Files (Rad EMAC)\Parcel C Phase II Swale\PARCEL C Phase II_Swale Details_Figure 3.dwg G G SECTION G-G BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN SWALE DETAIL 2 of 4 FIGURE 3 HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA.

82 P:\CTO-12 CAD Files (Rad EMAC)\Parcel C Phase II Swale\PARCEL C Swale Details_Figure 4.dwg SECTION H-H BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN SWALE DETAIL 3 of 4 FIGURE 4 HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA. I I H H EXISTING OUTFALL /TIE-IN POINT (TYPICAL) SECTION I-I

83 P:\CTO-12 CAD Files (Rad EMAC)\Parcel C Phase II Swale\PARCEL C Swale Details_ dwg E SECTION E-E F F BLANDY ST SWALE DETAIL 3 / TIE-IN POINT E SECTION F-F BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN SWALE DETAIL 4 of 4 FIGURE 5 HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA.

84 P:\CTO-12 CAD Files (Rad EMAC)\Parcel C Phase II Swale\PARCEL C Phase II_Swale Key Plan_ dwg BASE REALIGNMENT AND CLOSURE PROGRAM MANAGEMENT OFFICE WEST SAN DIEGO, CALIFORNIA PARCEL C PHASE II DESIGN PLAN DRAINAGE AREAS FIGURE 6 HUNTERS POINT NAVAL SHIPYARD, SAN FRANCISCO, CA

85 APPENDIX B CONSTRUCTION SPECIFICATIONS RMAC Parcel C Phase II Design Plan.doc Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

87

88 REVISION LOG Revision Date Revision No. Prepared By Description of Changes Affected Pages 2/09/ Senda Ozkan Original Issue All 12/02/ Timothy Lai 1. Incorporated two previous FCRs (2009- CTO and 2009-CTO70-001) pertaining to compaction requirements in Non-traffic and Traffic Areas (Earthwork Section 3.5 B and C). Added plate compactor for difficult to access areas. 2. Removed target 90% compaction statement for Main Arterial Roads (below 3 of pavement) as procedures for deep trenches are already cited (Earthwork Section 3.5 F). 3. Clarified prevention of sediment discharge into the San Francisco Bay. 4. Soil stockpile stabilizer/dust control spray (such as Soiltac ) added in Section 3.3 C. Silt fencing added as an option in Section 3.3 E. 5. Utility poles can be supported with an approved engineering system (Section 3.2A). 6. Clarified time frame for inspection/repair of erosion and sediment control measures. 7. Clarified gradation submittal only for / /2

89 backfill soil to be used for areas requiring in-situ compaction testing (Section 1.2A). Removed Section 2.2, Borrow Source Characterization. 8. Removed reference to 20-mil liner in temporary drainage swales (Section 3.6). 9. Added rope and other delineators in Section 3.2 D to prevent unauthorized entry into excavation areas /25/ Richard Weingarz 10. Clarified reference to the Base-wide Work Plan in the Earthwork Section (02300) as the Base-wide Storm Drain and Sanitary Sewer Removal Work Plan. 1. Add reference of applicable SWPPP 2. Incorporate inspection requirements of revised SWPPP 3. Capitalized Field Engineer, Resident Engineer, and Engineer/Engineering. Changed feet to foot. 4. Clarified Backfill and Compaction requirements Throughout /17/10 3 Shanti Montgomery 1. Add reference to Hunters Point Shipyard Project Backfill Review and Acceptance Procedure HPO-Tt

90 07/27/ Sam Ho 1. Added submittal requirements for import soil and clarified requirements for import soil for use in traffic and main arterial designated areas. Added flexibility in acceptance of other types of imported soil based on evaluation by the Engineer. 2. Updated the Storm Water Pollution Prevention Plan inspections requirements. 07/26/ Sam Ho 1. Updated the Stormwater Pollution Prevention Plan (SWPPP) referenced location in Section Plan 1 A. 2. Updated the Waste Management Plan referenced location in Section B 3. Updated the Base-wide Storm Drain and Sanitary Sewer Removal Project Work Plan to Basewide Radiological Management Plan in Section and 3.2 B. 4. Updated the Waste Management Plan referenced location in Section

91 TABLE OF CONTENTS SPECIFICATION SECTIONS Section Number Title Rev Number Temporary Erosion, Sediment and Stormwater Runoff Control Earthwork 5

92 PART 1 PART 2 GENERAL SECTION TEMPORARY EROSION, SEDIMENT AND STORMWATER RUNOFF CONTROL A. This work shall consist of furnishing, installing, constructing, and maintaining temporary erosion-control measures during construction to prevent sediments from entering the bay in accordance with the Stormwater Pollution Prevention Plan (SWPPP) provided as an attachment to the Parcel-specific Execution Plan (or most current revision). B. Temporary erosion and sediment control measures shall be constructed and maintained in accordance with these specifications and in compliance with the details shown in the SWPPP. C. Stormwater runoff control measures shall be implemented to prevent unsafe ponding in low lying traffic sections and to divert storm water into the ground or to the San Francisco Bay. PRODUCTS 2.1 GENERAL Temporary erosion and sediment control materials that are shown in Parcel-Specific drawings shall be used. 2.2 STORMWATER POLLUTION PREVENTION PLAN A. A SWPPP has been developed for work being conducted at Hunters Point Shipyard. The SWPPP addresses construction phases and proposed pollution-prevention measures during construction and outlines the sequence of implementation of the erosion and sediment control measures. B. Tetra Tech EC, Inc. (TtEC) shall review temporary erosion control measures to be used at the pre-construction conference. PART 3 EXECUTION 3.1 GENERAL A. Construct temporary erosion, sediments, and stormwater runoff control measures specified in the Parcel-Specific Design Drawings. B. Temporary erosion and sediment control measures shall be used, as applicable, for all construction activities. 1. Temporary erosion and sediment control measures shall also be used as necessary to correct unforeseen conditions not anticipated in the SWPPP that develop during construction Rev 5

93 SECTION TEMPORARY EROSION, SEDIMENT AND STORMWATER RUNOFF CONTROL 2. Provide any Engineering approved type and configuration of the particular measure unless otherwise designated in the contract. In all cases, the method of filtering runoff shall effectively prevent the discharge of sediment into the San Francisco Bay, and shall comply with the requirements of the SWPPP. 3. Temporary erosion and sediment control features shall remain in place until permanent erosion-control measures are in place and operational to a point that will prevent erosion of the finished grades. 3.2 SEQUENCE OF OPERATIONS A. Conduct an on site review of the SWPPP before starting construction operations. B. Earth-disturbing operations shall not be initiated until the sequence and method of operations have been approved by Engineering. 3.3 PROTECTION OF WATERCOURSES A. Schedule and conduct construction operations to prevent sediments from flowing to the bay adjacent to the project in full compliance with the SWPPP. B. Temporary storage and staging areas and construction roads shall be located and constructed in a manner that will prevent sediments from entering the San Francisco Bay and that will permit effective application of erosion and sediment control measures. C. A 10-mil (or thicker) plastic liner (HDPE, PVC, or equivalent) shall be used to cover stockpiles at the end of each day and during rainy weather and/or windy conditions. Sandbags or other applicable ballast shall be used to weigh down the cover. Alternatively, a soil stockpile stabilizer/dust control spray (such as Soiltac ) can be used instead. D. The excavated soil (potentially contaminated), manholes, and pipes shall be spread out on a temporary lay down/staging area consisting of a minimum two 10-mil (or 1 20-mil) layers of HDPE, PVC liner or solid polyethylene trays. A minimum 10-mil liner can be used when the potentially contaminated item is placed on asphalt, concrete, or leveled/compacted ground (where the probability of liner puncture is lower). E. Straw wattles shall be used as a berm to be built around the stockpiles and reinforced with sandbags as necessary. Alternatively, the stockpile area may be protected by silt fencing. F. Outfall structure construction shall be conducted at low-tide and adequate erosion and sediment control measures shall be applied Rev 5

94 SECTION TEMPORARY EROSION, SEDIMENT AND STORMWATER RUNOFF CONTROL 3.4 INSPECTION AND MAINTENANCE A. Inspect stormwater control structures, Best Management Practices for erosion and sediment control, and non-stormwater control structures weekly, plus quarterly and 48 hourrs before (prediction of), at least once each 24-hour period, and following (measurement of) each qualifying rain event, defined as 0.5 inch of rain or more at the time of discharge, in accordance with the SWPPP. B. Repair any erosion and sediment control measures immediately following the inspection during which damage is noted or at any time following notification by the Qualified SWPPP Practitioner (QSP) that repairs are required. C. Repairs shall be initiated within 24 hours of discovering damage to erosion-control measures that could result in a discharge of sediment into the bay. D. All temporary erosion and sediment control measures shall be maintained by cleaning or replacing as needed, or as directed by the QSP. E. Measures to remain following completion of the work shall be maintained until final acceptance of the project. 3.5 REMOVAL OF CONTROL MEASURES A. Biodegradable erosion and sediment control features may remain in place after construction operations are completed unless otherwise designated in the contract. B. Dispose of waste materials in accordance with the Waste Management Plan provided as an attachment to the Parcel-specific Execution Plan. 3.6 RECORD DRAWINGS Actual locations of temporary swales may deviate from issued design drawings. The Field Engineer with the assistance of a licensed surveyor shall plan actual locations of the swales to take advantage of site topography. The Field Engineer is responsible for maintaining record drawings. END OF SECTION Rev 5

95 SECTION EARTHWORK PART 1 GENERAL 1.1 SUMMARY A. The work described in this section includes the following: 1. Excavation of storm water and sewer lines. 2. Pipeline sealing. 3. Disposal of excavated materials. 4. Backfill and compaction. 5. Installation of new drainage system. 1.2 SUBMITTALS A. For imported materials, the following test reports will be submitted and approved. 1. Grain Size Distribution [American Society for Testing Materials (ASTM) D ] provided by the supplier. This is only required for backfill soils that will be used in areas requiring in-situ compaction testing (See Section 3.5F). If not available, a competent TtEC person will evaluate the gradation of imported material for acceptance. 2. Test reports shall be provided by a laboratory that is independent of the supplier. B. Laboratory test results for backfilled soil (See Section 3.5F). 1. Optimum moisture content and maximum density (ASTM D 1557 Standard Methods of Test for Moisture-Density Relations of Soils, Using 10-lb Hammer and 18-in. Drop). C. In-situ field compaction test results (See Section 3.5F). 1. Use either ASTM D 1556 (Standard Method of Test for Density of Soil in Place by the Sand Cone Method) or ASTM D 2922 (Density of Soil and Soil Aggregate in Place by Nuclear Methods (Shallow Depth). 1.3 QUALITY ASSURANCE A. Sampling, testing and inspection for compliance with the Contract documents shall be in accordance with the requirements specified herein Rev 5

96 PART 2 PRODUCTS SECTION EARTHWORK 2.1 GENERAL Materials shall be of the quality, size, shape, and gradation or equal to those as specified in this specification, design drawings and/or Basewide/Task Specific Work Plans. PART 3 EXECUTION 3.1 GENERAL Excavation and other earth work activities shall conform to the design drawings, Parcel Specific Design Plan, and Basewide Radiological Management Plan as specified. 3.2 EXCAVATION OF STORM WATER AND SEWER LINES A. Preparation activities before excavation includes the following: (1) Underground utility locate shall be conducted prior to excavation; (2) Groundwater monitoring wells and soil vapor monitoring points (if any) to be properly abandoned if they are within the excavation limits; (3) Remove trees, utility poles and other obstructions if they exist within the excavation limits. Alternatively, utility poles can be supported with an approved engineering system. B. All trenches and other excavations can have near vertical sides to facilitate pipe removal. If entry or exit from trenches is required, trenches and other excavations shall be protected against collapse by means of shoring in conformance with the applicable CAL-OSHA requirements. Sloping/benching or shoring must be approved by a California-state Registered Engineer or his/her designated competent person as stated in the Basewide Radiological Management Plan. C. Excavation shall stop at approximately 10 feet from an existing building. Obtain approval from Engineering to excavate closer than 10 feet. D. TtEC shall take adequate measures to prevent unauthorized entry into excavation areas. The measures shall include installing guard railing, solid or chain link fencing, rope, and/or other delineators. 3.3 PIPELINE SEALING A. Pipelines will be closed by sealing the upstream and/or downstream ends of the lines with a common cement mixture (grout) or by using a mechanical plug as shown in design drawings. The closure should ensure that no water enters the lines. The downstream closure should be performed after the line is completely drained. A temporary plug can be used during the removal actions. B. The cement plugs shall be a minimum of 12-inches thick with a suitable backing to hold the plug in place. The front of the plug shall overlap the edge of the pipe to form a lip to hold the plug in position during backfill operations Rev 5

97 3.4 DISPOSAL OF EXCAVATED MATERIAL SECTION EARTHWORK All waste materials generated as a result of excavation activities shall be controlled and managed in accordance with the Waste Management Plan provided as attachment to the Parcel-specific Execution Plan (or in the applicable Task-specific Work Plan). 3.5 BACKFILL AND COMPACTION Excavated trenches shall be backfilled to approximately their original grade prior to excavation. In areas where a new drainage swale will be installed, backfilling shall be to the level indicated in the design drawings. A. Backfill Material 1. Chemically and radiologically tested and cleared excavated material including crushed clay pipes and objects can be used as backfill. Boulders or objects larger than 6 shall not be used within 4 feet of the final surface elevation or near installed pipes. 2. Imported soil shall be clean (chemical/rad levels shall be acceptable) and specification sheet submitted to the engineer for approval in accordance with Hunters Point Shipyard Project Backfill Review and Acceptance Procedure HPO- Tt Submittals shall include, but not limited to, gradation, sand equivalent (SE) value, Unified Soil Classification System (USCS) designation, and compaction characteristics (maximum dry density and optimum moisture content). Import soil particles shall be less than 2 inches in diameter. Soil used within 3 feet of final grade of main arterial roads and within 2 feet of final grade for traffic areas shall preferably be well-graded (GW or SW), but other types of soil might be acceptable after further evaluation of its gradation, SE value, expansive characteristics, and plasticity. All new import materials shall be evaluated and approved by the Engineer. Traffic areas and main arterial roads shall be designated by the Engineer and shall at least conform to the grading in the table below for consideration for use as backfill material. Sieve Sizes Percentage Passing No No Caltrans Standard Specifications, Section 19 Earthwork, Poorly graded river rock and crushed stone can be laid (instead of excavated material) in trenches without specific compaction requirements. 4. Small boulders, rock, and stone can be used to stabilize the base of deep trenches when groundwater is encountered Rev 5

98 SECTION EARTHWORK B. Non-traffic Areas - Backfill shall be placed in 2 foot thick (loose) lifts. Compaction shall be achieved by pressing the soil down using heavy equipment such as an excavator or dozer (2 to 3 passes). The final 2 foot lift shall be compacted using compaction equipment compatible to the backfill soil as described in the Navy Design Manual [DM 7.2 (September 1986, Table 5, p and 49)]. A maximum 2 foot lift can be used in Non-traffic Areas. No in-situ testing is required. C. Traffic Areas - Backfill shall be placed in 2 foot thick (loose) lifts until within the final 2 feet of final grade. Compaction shall be achieved by pressing the soil down using heavy equipment such as an excavator or dozer (2 to 3 passes). Soil used in the final 2 feet shall be placed in maximum 12 inch lifts. Procedures from the Navy Design Manual shall be followed. For example, a crawler tractor (or equivalent) with contact pressure not less than 10 psi can be used. Compacted lift thickness shall be 6 to 10 inches (maximum) and 4 passes. Other equipment such as a sheepsfoot or vibratory roller may be used as long as it is compatible with the type of backfill compacted and procedures (lift size/compaction effort) from the Navy Design Manual are followed. For difficult to access areas, a power tamper/plate compactor or rammer (30-lb minimum weight) shall be used. Lifts shall be 4-6" for silt or clay and 6" for coarse grained soils and at least 2 passes are required. The Navy guidelines provide for compaction of 95 to 100% Standard Proctor Maximum Density. No insitu testing is required in traffic areas not designated as main arterial roads. D. Near Installed Pipes (pipe bedding and cover) Backfill shall be placed in 12 inch lifts. Compaction shall be achieved by using a handheld plate compactor (Wacker Packer Plate Compactor model WP1550A or equivalent) with 2 passes as a minimum. A minimum of 3 feet cover shall be placed prior to heavy equipment compaction. If this is not possible, controlled density fill (CDF) [or lean concrete] shall be used. E. Deep trenches Groundwater is expected in deep trenches (more than 4 feet deep). Small boulders and gravel may be placed until the base of the trench is stabilized (slightly above the water table). No compaction requirements are specified for the small boulders and gravel under water. Use a vibratory or needle/wheel compactor attachment with the backhoe/excavator to compact the soil above the stabilized base. The vibratory/impact energy required (number of passes/size of attachment) will depend on the trench size and condition, type of soil and shall be evaluated by Engineering. F. Main arterial roads (shown on the design drawings or as designated by Engineering) A relative compaction of not less than 95% is required throughout each layer/lift (one foot thick) of backfill within 3 feet of pavement subgrade, or adjacent ground (City and County of San Francisco Standard Specification Section ). A minimum of one compaction sample shall be taken every 50 feet of trench. Laboratory tests for maximum dry density and optimum moisture content are required for each batch/source of backfill material. A minimum of one sample for every 5000 cubic yards is required. Additional samples may be requested by Engineering. For areas Rev 5

99 SECTION EARTHWORK below 3 feet of pavement subgrade, no in-situ testing is required. Procedures for traffic areas and deep trenches should be followed. 3.6 INSTALLATION OF NEW STORM DRAINAGE SYSTEM A surface drainage swale system will be constructed with non-woven geotextile and drain rock and discharging through rock apron outfalls per the design drawings. A. Installation of the Liner and Erosion Control Rock for Drainage Swales 1. Geotextile and/or geomembrane shall be installed in drainage swales and outfalls as specified in design drawings and according to manufacturer s requirements. 2. Geotextile fabric shall be 8 ounces/yard non-woven type conforming to AASHTO Specification M Placement shall be made in a manner that will produce a smooth blanket with minimum 3 foot overlap at seams working out any wrinkles. Displacement of geotextile shall be repaired or corrected prior to covering it with rock. Liner shall be inspected for damage and movement after storm events and repaired if needed. 4. Dense, sound, clean, durable rock with dimensions between ¼ inch to two-inch in diameter shall be placed on prepared surface providing a dense mass with a minimum thickness of three inches conforming to the grades and dimensions as shown in the design drawings. Installed rock shall be inspected for damage and movement after storm events and repaired if needed. B. Erosion Control Riprap for Outfalls: 1. Riprap shall be solid, durable rock with sufficient smaller rock to provide a dense mass. 2. Average minimum rock size, D 50, and minimum thickness of rock apron are specified in the design drawings. END OF SECTION Rev 5

100 APPENDIX C HUNTERS POINT SHIPYARD PROJECT BACKFILL REVIEW AND ACCEPTANCE PROCEDURE RMAC Parcel C Phase II Design Plan.doc Final Parcel C Phase II Design Plan Radiological Remediation and Support Hunters Point Naval Shipyard, San Francisco, California DCN: RMAC CTO 0012

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103 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 2 of 9 REVISION HISTORY Revision (Date) Rev. No Prepared By Description of Changes December 14, Slattery/Holman New Procedure All April 12, Schneider/Slattery Editorial changes, revised form All Affected Pages backfill R1.doc

104 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 3 of 9 TABLE OF CONTENTS PAGE REVISION HISTORY... 2 TABLE OF CONTENTS PURPOSE SCOPE MAINTENANCE RESPONSIBILITIES DEFINITIONS AND ABBREVIATIONS PROCEDURE DETAILS GENERAL PROCEDURE PROCESS Initial Data and Standards Compilation Data Evaluation Results Designation Regulatory Specialist Review Quality Control Review Approval Site Acknowledgement RECORDS... 9 backfill R1.doc

105 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 4 of PURPOSE This procedure describes the individual roles, responsibilities, and the procedural requirements to ensure that backfill materials are adequately reviewed and accepted prior to being brought onsite. This procedure addresses the requirements for chemical, geotechnical and radiological review and acceptance, as appropriate, for the specific material. 2.0 SCOPE This procedure will be implemented prior to the import or use of any material intended for backfill at Hunters Point Shipyard (HPS). This procedure does not provide the specific acceptance criteria but does define the process to ensure that the appropriate acceptance criteria are both determined and applied. 3.0 MAINTENANCE The Project Quality Control Manager (PQCM) is designated the procedure owner and is responsible for updating this procedure. Approval authority rests with the Project Manager (PjM). 4.0 RESPONSIBILITIES Project Manager - The PjM is responsible for implementation and compliance with this procedure during project operations. The PjM or designated Task Manager (1) ensures that activities adhere to the requirements of this document and (2) is the final authority for approving the import of backfill material. In instances where this procedure or jobspecific guidance documents are not being followed, the PjM will stop the work. Construction Manager (CM) - The CM or designated Superintendent is responsible to ensure that (1) material intended for backfill will not be imported without being approved in accordance with the requirements specified in this procedure and (2) imported backfill material is only used for the application(s) identified in the Backfill Review and Acceptance Form. Project Chemist - The Project Chemist is responsible for evaluating non-radiological chemical data from potential import fill sources relative to the acceptance criteria in the applicable work plan. Project Engineer - The Project Engineer is responsible for evaluating geotechnical data from potential import fill sources relative to the acceptance criteria in the applicable work plan. backfill R1.doc

106 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 5 of 9 Radiological Safety Officer (RSO) - The RSO is responsible for evaluating radiological data from potential import fill sources relative to the acceptance criteria in the applicable work plan. Regulatory Specialist (RS) The RS is responsible to review the acceptance criteria specified for the backfill material and ensure that the criteria are consistent, current, and acceptable. Project Quality Control Manager The PQCM is responsible to ensure that this procedure has been reviewed and approved prior to use and to verify compliance with this procedure. In instances where this procedure is not being followed, the PQCM will immediately inform the PjM and, as applicable, the assigned Task Manager. The PQCM is responsible for the maintenance of this procedure. Preparer A preparer will be assigned by the PjM or designated Task Manager once the need to import backfill materials has been identified. The preparer is responsible to compile relevant analytical, geotechnical and radiological data, complete the initial sections of the Backfill Review and Approval Form (Attachment 1) and provide complete data to the reviewers. Subsequently, the preparer is responsible to track the progress of the review process and ensure that the review is proceeding in accordance with the schedule established by the PjM or designated Task Manager. 5.0 DEFINITIONS AND ABBREVIATIONS Backfill - Any material used to refill an excavated area. 6.0 PROCEDURE DETAILS 6.1 GENERAL This procedure will be initiated when the need for imported backfill materials is first identified. Conformance with the procedure will be documented by completing the Backfill Review and Approval Form. 6.2 PROCEDURE PROCESS INITIAL DATA AND STANDARDS COMPILATION The PjM or designated Task Manager will assign a Preparer. The Preparer will complete initial sections of the Backfill Review and Approval Form by compiling the following applicable information: Identifying the backfill source backfill R1.doc

107 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 6 of 9 Specifying the relevant source sample numbers Identifying the planned use of the backfill Identifying the relevant sections from applicable work plan and SAP The Preparer will then attach copies of the applicable reference sections and data including: Sampling and Analysis Plan (SAP) sections/tables for chemistry SAP sections/tables/ for radiological constituents Work plan sections for geotechnical analysis Reports for relevant chemical, radiological, and/or geotechnical analyses DATA EVALUATION When initial section and the attachments are completed, the Preparer will provide the Backfill Review and Approval Form (with attachments) to the Project Chemist, RSO and Project Engineer for review (as applicable). Each reviewer will review the data relevant to their area of expertise. Data will be strictly reviewed against the established criteria. For chemical data, analytes without established criteria may be detected. The purpose of these evaluations is to review the data and determine if any exceedance of the established acceptance criteria exists and/or identify and evaluate other detected analytes without established acceptance criteria. In cases where a detected result was identified and an established acceptance criterion does not exist, the result will be provided to the RS for review and a determination of the significance of the result. The RS will specify the conclusion of their determination on the Backfill Review and Acceptance Form RESULTS DESIGNATION There are three possible evaluation designations that can result from the evaluation of the data. They are: backfill R1.doc

108 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 7 of 9 Chemical data evaluation Class 1 (1) Class 2 (1) Class 3 (2) Analytes are below established criteria AND Analytes without established standards are not detected Non-metal analytes are below established criteria AND Metal analytes are below HPAL (3) AND Detected analytes without established criteria are deemed acceptable by the RS N/A Radiological data Results are below evaluation established standards Geotechnical data Results are below N/A evaluation established standards (1) All chemical, data must meet the specified criteria in Class 1 or 2 for that class to apply (2) Class 3 will apply if any one (or more) of the Class 3 criteria are met. (3) HPAL (Hunters Point Ambient Level) One or more non-metal analytes exceeds established criteria OR One or more metal analytes exceeds HPAL (3) OR Detected analytes without established criteria are deemed unacceptable by the RS One or more results exceeded established standards One or more results exceeded established standards Each reviewer will mark the appropriate evaluation designation box ( Class 1, Class 2, or Class 3 ) on the Backfill Review and Approval Form and sign and date the form. The basis for a proposed Class 2 or Class 3 designation will be documented in writing by the reviewer. Any additionally required information will be either attached or noted on the form REGULATORY SPECIALIST REVIEW After the Project Chemist, RSO and Project Engineer have completed their evaluation, the RS will review the conclusions. The RS will concur in writing with any Class 2 designation and will explain the basis for concluding that a detected result for an analyte without established acceptance criterion should not be the cause to reject the backfill source. The RS will also review the established acceptance criteria against which the data were evaluated to assess if any applicable standards changed after the work plan documents were prepared. Any backfill source that is designated as Class 3 after this step will be rejected without further evaluation. This will be reported to the PjM (and designated Task Manager, if applicable), and the Backfill Review and Approval Form (including attachments) will be filed. backfill R1.doc

109 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 8 of QUALITY CONTROL REVIEW Backfill source that is designated as Class 1 or 2 after the technical and RS reviews are completed and the findings are reported/documented, the PQCM will perform the following: Confirm that the correct acceptance criteria in the work plan(s) and SAP(s) were provided to the reviewers Verify that frequency of samples collected and analysis performed are in accordance with the work plan(s) and SAP(s) Perform a 10% random spot check of analytical data against the acceptance standards Verify that all applicable reviews were completed and that the reviewers have signed off on the Backfill Review and Approval Form. Any deviations or errors identified in this step will be reported to the PjM (and designated Task Manager, if applicable). No backfill source will be approved until such time as identified deviations or errors are corrected APPROVAL The PjM, or designated Task Manager has approval authority for backfill materials. At no time will the PjM approve import of material that is designated as Class 3. The approval/rejection for Class 1 and Class 2 materials will be designated on the form and will meet the following requirements: 1. For backfill sources that are designated as Class 1, the PjM may approve import of the material without further consultation. The PjM will sign the form and notify the CM to proceed with importing the backfill. 2. For backfill sources that are designated as Class 2, the PjM may recommend approval to the Department of the Navy (DON). PjM approval of these materials may only be done with the concurrence of the DON, as documented by a DON representative s signature for acceptance on the Backfill Review and Approval Form, or in writing by or other acceptable means. Any DON approval aside from signing the form will be attached to the form. The PjM will notify the CM of the determination and acceptance or rejection of the materials SITE ACKNOWLEDGEMENT The PjM, or designated Task Manager, will provide a copy of the signed Backfill Review and Approval Form to the CM. Prior importing the material, the CM will review the form and sign it to acknowledge that the material has been approved for the specific use identified on the form. Prior to using the material for any other application, the CM must backfill R1.doc

110 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 Page 9 of 9 inform the PjM, or designated Task Manager. The PjM or Task Manager, will be responsible for ensuring that the material is re-approved for the proposed application in accordance with this procedure prior to allowing the new use. 7.0 RECORDS Complete the Backfill Review and Approval Form included as Attachment 1 and provide all necessary backup specified in this procedure. backfill R1.doc

111 Hunters Point Shipyard Project Backfill Review and Acceptance Revision 1 ATTACHMENT 1 BACKFILL REVIEW AND APPROVAL FORM backfill R1.doc

112 BACKFILL REVIEW AND ACCEPTANCE FORM Contract No. CTO No. Form No. Page 1 of 2 BACKFILL - Preparer: Date: Planned Backfill Usage: Source of Material: Sample I.D.: Sample I.D.: ATTACHMENTS Attached Not Applicable Specify Work Plan Section/Tables for geotechnical: SAP Section/Tables for Analytical: SAP Section/Tables for Radiological: Chemistry Data: Geotechnical Data: Radiological Data (onsite): Radiological Data (offsite): Other: CHEMISTRY DATA EVALUATION Class 1 Analytes are below established criteria AND Analytes without established standards are not detected Class 2 Non-metal analytes are below established criteria AND Metal analytes are below HPAL AND Detected analytes without established criteria are deemed acceptable by the RS Class 3 One or more non-metal analytes exceeds established criteria OR One or more metal analytes exceeds HPAL OR Detected analytes without established criteria are deemed acceptable by the RS Explanation for Class 2 or 3: (Attach additional sheet if necessary) Chemist Signature Date February, 2006

113 BACKFILL REVIEW AND ACCEPTANCE FORM (Cont.) Page 2 of 2 Contract No. CTO No. Form No. N D-5713 BACKFILL - RADIOLOGICAL DATA EVALUATION Class 1 Class 3 RSO Signature Date Results are below established standards One or more results exceeded established standards Explanation for Class 3 (Attach additional sheet if necessary) GEOTECHNICAL DATA EVALUATION Class 1 Class 3 Engineer Signature Date Results are below established standards One or more results exceeded established standards Explanation for Class 3 (Attach additional sheet if necessary) REVIEW Regulatory Specialist (Signature) Explanation Date Project QC Manager (Signature) Explanation (if any) Date APPROVAL Project Manager (Signature) Date DON Representative (Signature) Date Construction Manager (Signature) ACKNOWLEDGEMENT Date Backfill Rvw&ApprovalFormR1.doc February, 2006