EASTERN MUNICIPAL WATER DISTRICT SMALL SEWAGE LIFT STATION GUIDELINES, STANDARD DRAWINGS, AND SPECIFICATIONS

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1 Last Update: 07/12/16 EASTERN MUNICIPAL WATER DISTRICT SMALL SEWAGE LIFT STATION GUIDELINES, STANDARD DRAWINGS, AND SPECIFICATIONS EASTERN MUNICIPAL WATER DISTRICT 2270 TRUMBLE ROAD PERRIS, CALIFORNIA (951) Prepared by KRIEGER & STEWART, INCORPORATED 3602 UNIVERSITY AVENUE RIVERSIDE, CALIFORNIA (951)

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3 TABLE OF CONTENTS

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5 Last Update: 07/12/16 TABLE OF CONTENTS SECTION PAGE I. Introduction 1 II. Procedures 1 III. General 6 IV. Capacity 7 V. Sewage Lift Station Site 8 VI. Force Main 9 VII. Lift Station 10 VIII. Electrical and Controls 13 IX. Emergency Power 13 X. Telemetry Equipment 15 APPENDIX A Sample Design Calculations TABLES Table 1 Related District Standard Drawings DETAILED PROVISIONS Refer to the latest Standard Detailed Provision Sections located at the following web site ( Section Section Section Section Section Section Section Section Section Section Section General Safety Requirements Maintenance Manual Requirements Temporary Sewage Lift Station Demolition Construction Methods & Earthwork Control Density Fill Asphalt Concrete Paving Formwork for Cast-in-Place Concrete Reinforcing Cast-in-Place Concrete Concrete Masonry Units Chemical Resistant Coatings i

6 Last Update: 07/12/16 TABLE OF CONTENTS (Continued) Section Section Section Section Section Small Submersible Sewage Lift Station with Emergency Standby Power Generation Small Submersible Sewage Lift Station without Emergency Standby Power Generation Electrical Panel Sunshade Structure Plug Valves Electrical Short Circuit/Coordination Study, Arc Flash Hazard Study, and Field Testing of Electrical System Refer to the latest Standard Detailed Provision Sections located at the following web site ( SMALL SEWAGE LIFT STATION STANDARD DRAWINGS (11 x 17) DRAWING FILE Title Sheet G-1 D Typical Site Plans C-1 D Wet Well Plans, Section, and Detail (120 gpm to 260 gpm capacity) M-1A D Wet Well Plans, Section, and Detail (260 gpm to 500 gpm capacity) M-1B D Miscellaneous Wet Well Details and Sections M-2 D Wet Well Structural Plans, Sections, and Details (120 gpm to 260 gpm capacity) Wet Well Structural Plans, Sections, and Details (260 gpm to 500 gpm capacity) Electrical Panel Sunshade Structure Foundation Plan, Elevation, and Section S-1A D S-1B D S-2 D Electrical Symbols, Abbreviations, and Lighting Fixture Schedule E-1 D Single Line Diagram (With Standby Generator), MCC Plan and Elevations E-2A D ii

7 Last Update: 07/12/16 TABLE OF CONTENTS (Continued) SMALL SEWAGE LIFT STATION STANDARD DRAWINGS (11 x 17) DRAWING FILE Single Line Diagram (Without Standby Generator), MCC Plan and Elevations E-2B D Control Diagrams E-3 D RTU Status/Alarm Signal Wiring Diagrams E-4 D MCC and Sunshade Grounding Plan and Service Pedestal Detail E-5 D Miscellaneous Details ME-1 D Typical Temporary Small Lift Station Demolition Site Plan D-1 D Demolition Plan, Section, and Details D-2 D iii

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9 GUIDELINES

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11 Last Update: 07/12/16 EASTERN MUNICIPAL WATER DISTRICT SMALL SEWAGE LIFT STATION GUIDELINES I. Introduction Sewage collection within the District service area shall be provided by the construction of gravity sewers, except where it is demonstrated unfeasible and pumping is required. If a sewage lift station is proposed, it shall be the developer's responsibility to provide the services of a licensed civil engineer to demonstrate to the District that a sewage lift station is the most feasible method for sewage conveyance. These guidelines present basic concepts and general criteria for small sewage lift station facilities with capacities not exceeding 500 gpm. Each lift station shall be reviewed and approved by the District from concept through design, construction, and start-up. Detailed Provision Sections 11200, 11210, and and the Standard Drawings are provided to present lift station construction requirements. Detailed Provision Section and the Standard Drawings are provided to present demolition requirements for temporary lift stations. The District reserves the right to modify and supplement these guidelines, specifications, and drawings to require additional facilities, depending upon the specific project location, limitations, and changes in government regulations and standards. II. Procedures Prior to the District's approval and acceptance of a temporary or permanent sewage lift station, developer and developer's engineer shall comply with the following requirements: A. Design and Construction of Temporary or Permanent Small Sewage Lift Stations 1. Developer's engineer shall acquire and review these guidelines; Detailed Provision Sections 11200, 11210, and 13123, and other Detailed Provision Sections referenced in these guidelines; and the Standard Drawings. 2. Developer and engineer shall request a concept meeting with District staff to demonstrate the need for a sewage lift station and to review requirements, guidelines, criteria, right-of-way, and location of specific project facilities. District will provide list of approved materials. 1

12 Last Update: 07/12/16 3. Developer shall submit all documentation requested by the District in order to demonstrate the need for a sewage lift station, including the following: a. Complete calculations for sewage flows within the entire drainage area tributary to the lift station. b. Preliminary drawings showing planned gravity collection system within the lift station drainage area, including point(s) of connection to existing or future gravity interceptor sewers, if any. c. Determination whether the proposed lift station will be temporary or permanent. d. Calculations establishing the required lift station capacity for initial planned development and ultimate development. e. Preliminary drawings showing the proposed alignment for the lift station force main including point of discharge. 4. If the District concurs that a lift station is required, developer's engineer shall submit design calculations, drawings, and specifications for District approval as follows: a. Preliminary design calculations and information including required capacity, hydraulic analyses, pump selections, and system curves, and preliminary site layout. Sample design calculations are included in Appendix A. Depending upon location, the District will establish site improvements such as masonry block wall or chain link fence, asphalt concrete or concrete pavement, lighting, access, etc. District will provide specialty specifications to be used. b. Submit 75% complete construction drawings. c. Submit legal plat and description for proposed property in fee title and/or easements for lift station site and force main (if applicable). Legal plats and description shall conform to EMWD's standards. Contact District's Right-of-Way Department for details. Note, final plans will not be signed until this information is received and reviewed for conformance to site plan. 2

13 Last Update: 07/12/16 d. Submit final design and 100% complete construction drawings. As a minimum, construction drawings prepared by the developer shall include a title sheet and detailed site plan. The title sheet shall include a summary of project specific requirements and data (see sample title sheet provided herein). As a minimum, the lift station site plan shall show the following: Location of all proposed facilities (referenced to site property lines or easement boundary). Location of gravity sewer and manholes. Provide bearings and distances along each gravity sewer segment shown on the Site Plan. Provide invert elevations (inlet and outlet) at each manhole. Gravity sewers shall be labeled with pipe size and material. Manholes shall be labeled with size and Standard Drawing reference. Location of emergency bypass manhole directly adjacent to wet well. All collection sewers entering the lift station site shall terminate at the emergency bypass manhole. Emergency bypass manhole shall be provided with a 36" diameter fiberglass reinforced plastic (FRP) manhole cover. Provide invert elevations at bypass manhole inlet and outlet. Location of force main and emergency bypass connection. Provide bearings and distances along each force main segment shown on the Site Plan. Provide center grade elevations at each horizontal and vertical point of inflection (HPI and VPI). Force main shall be labeled with pipe size, material, and class. Location of each electrical conduit, pull box, junction box, and SCE service and transformer. Refer to Conduit Schedule on Electrical Drawings for conduit destinations. Label all conduits shown in the Conduit Schedule. 3

14 Last Update: 07/12/16 Location of all site improvements, including site fencing or masonry block walls and access gate(s). Where masonry block walls are selected for site security, label top of wall and top of footing for each wall segment. Walls shall be constructed level. Walls shall step as required to provide a minimum of 6'- 0" height from outside finished grade. Provide a construction detail for masonry block wall and concrete footing showing all dimensions, reinforcing steel, block type, and grouting requirements. Provide details for site fencing and access gates if District standard fencing and gates are not used. Finished grades for all proposed facilities and site improvements. As a minimum, grades (elevations) shall be provided for all concrete slabs and roofs, asphalt concrete paving (along pavement edges and flow lines, adjacent to concrete slabs and roofs, etc.), masonry block walls and footings, and finish grading adjacent to site improvements. Location of microwave and radio communications antenna and tower for District SCADA communications. Developer shall coordinate with District during final design so that District can survey the site to determine if an antenna tower will be required based on the site's location. District will provide required antenna mounting height and details for antenna tower for developer's engineer to include on Construction Drawings. Developer will pay all costs for construction of antenna. 5. Prior to construction submit signed final design "approved for construction" SCE service plan to District. 6. Prior to construction (installation), shop drawing submittals for all proposed equipment and materials shall be submitted to the District for approval. 7. Construction of facilities shall be in accordance with approved construction drawings and District specifications. District will provide inspection of facilities, witness start-up, and provide final inspection of facilities. District staff shall receive final operation and maintenance manuals for all equipment a minimum of 10 working days prior to receiving training for station operation and equipment operation. A factory trained equipment manufacturer's representative shall provide the training. 4

15 Last Update: 07/12/16 B. Demolition of Temporary Small Sewage Lift Stations Plans for temporary lift stations shall include construction drawings and demolition drawings. Submittal of demolition documents (drawings and specifications) for District review shall coincide with submittal of the corresponding construction documents. Procedures required for District approval of temporary lift station demolition documents are as follows: 1. Developer's engineer shall acquire and review Detailed Provision Section and the Standard Drawings. 2. Developer and engineer shall request a concept meeting with District staff to discuss future diversion of sewage flow from the temporary lift station to a gravity sewer, de-activation and demolition of lift station facilities, and the anticipated schedule for performing the work. 3. Submit 75% complete demolition drawings and specifications (if requested by District). 4. Submit 100% complete demolition drawings. As a minimum, demolition drawings prepared by the developer shall include a detailed site plan. A sample demolition site plan is included herein for reference.. The demolition site plan shall show the removal of all facilities not addressed by the Standard Drawings. As a minimum, the site plan shall show demolition of site improvements including fencing, walls, gates, paving, driveways, lighting, electrical, and drainage facilities. 5. Submit 100% complete demolition checklist per Detailed Provision Section 02051, Exhibit A. 6. Submit a detailed cost estimate for performing the lift station demolition work. Demolition requirements shown on the Standard Drawings, and contained in Detailed Provision Section represent minimum District requirements. Depending upon the proposed re-use of the temporary lift station site, developer may elect to require more extensive demolition, including the complete removal of all below grade facilities. 5

16 Last Update: 07/12/16 III. General A. Raw sewage lift stations shall be designed and constructed in accordance with District guidelines herein, District standards (drawings and specifications), good engineering practice, applicable government regulations, Riverside County Health Services Department and State Water Resources Control Board, Division of Drinking Water (SWRCB DDW), Cal OSHA, Standard Specifications for Public Works Construction (Standard Specification), California Building Code, National Electric Code, Uniform Fire Code, and as approved by the District. B. Facilities shall be designed by a licensed civil engineer, registered in the State of California, experienced in the design of wastewater lift station facilities. Prior to commencing design, the Engineer shall submit to the District a statement of qualifications showing that he has designed a minimum of five sewage lift stations. The statement of qualifications shall include the name, client, capacity, and construction cost for each sewage lift station. Drawings and specifications shall be submitted for review and approval by the District. Soils investigation shall be performed for the lift station site and related interceptor sewer and force main. Sewer, force main, and lift station construction drawings shall be submitted simultaneously; sewer and force main shall include plan (1"=40') and profile (vertical 1"=4', horizontal 1"=40'), and lift station shall include site plan and standard drawings showing structural, mechanical, and electrical plans, sections, and details with project specific requirements. Sewer and force main plans shall be prepared in accordance with the District's "Guidelines for Sewer System Plans". C. All costs of temporary facilities shall be borne by the developer. D. Upon approval and acceptance by the District, facilities shall be owned by the District. Ownership shall include the lift station site and right-of-way for force main and gravity sewers. Gravity sewers and force main shall be constructed on District property, District right-of-way, or within public right-of-way whenever possible. Easements for gravity sewers and force main will only be considered under special conditions. All right-of-way and easement documents shall be submitted and approved by District prior to approval of the construction drawings. All right-of-way and easement documents shall be conveyed to the District and recorded prior to acceptance of facilities. 6

17 Last Update: 07/12/16 E. Prior to completion of the facility and District acceptance, complete records shall be furnished to the District including: 1. As-built record drawings. 2. Final approved shop drawings and submittals for all equipment and materials. 3. As-built electrical and control diagrams. 4. Minimum three copies of Operation and Maintenance Manuals for all equipment. 5. District staff training for station operation and equipment operation and maintenance. 6. Right-of-way, grant deed, and easement records. 7. All construction and operating permits. IV. Capacity A. The theoretical calculated peak flow shall be based on the development to be serviced with consideration of the entire drainage area and master planned facilities. The design flow shall be determined by increasing the theoretical calculated dry weather peak flow determined from entire drainage area by 20% (i.e. peak flow x 1.20 = design flow). Pumping units and wet well size shall be selected based on the design flow. Flows shall be provided for initial and ultimate conditions. If necessary, lift stations shall be located to maximize sewage collection for the entire drainage area and shall conform to the District's Wastewater Master Plan. Lift station pumping capacity may be dictated by minimum acceptable force main size and velocity criteria herein. B. Where Master Plan facilities have not been established, the developer shall be responsible to prepare wastewater flow projections for the drainage area. C. Hydraulic calculations and system/pump curves for pump sizing and required capacity shall be submitted for both initial and ultimate peak flows. System curves shall be developed for friction coefficients of C=120 and C=140. System curves shall include minor friction losses (i.e. fittings and valves in discharge piping at wet well and fittings in force main). Pumps shall be selected based on friction coefficient of C=140. Developer's engineer shall select a minimum of three District-approved pump manufacturers and plot C=120 and C=140 system curves on each pump curve. 7

18 Last Update: 07/12/16 D. Downstream sewers shall be evaluated to ensure adequate capacity is available for receiving lift station sewage flow. V. Sewage Lift Station Site A. Site shall be of adequate size to operate, maintain, and repair the lift station facilities incorporating access for truck cranes and sewer cleaning trucks (Vactor trucks). B. All permanent sewage lift station sites require the parcel to be deeded to the District. Before construction, a Grant Deed with legal description and plat map must be prepared, approved, and recorded by the District. Refer to District typical layout drawings for plat map preparation. C. As a minimum, site shall be secured by commercial grade 6-foot high chainlink fence with 3-strand barbed wire or a 6-foot high masonry block wall. Access gate(s) shall include minimum 20-foot wide double gate for vehicles. Chainlink fencing and gates shall be provided in accordance with District Standard Drawing D-672. D. Entire site shall be provided with asphalt concrete pavement or concrete pavement, and adequate drainage facilities. Access driveway(s) to the site shall be 20-foot wide (minimum) and constructed of asphalt concrete pavement or reinforced concrete pavement. Asphalt concrete pavement or reinforced concrete pavement shall be designed to accommodate AASHTO H20-44 vehicle loading. E. If required by the District, based on proximity of the facility to other public facilities, residences, or buildings, landscaping shall be provided in accordance with the surrounding area. F. Potable water shall be provided to the site by hose bibs with antisiphon devices, water meter, and a backflow prevention device as approved by the District and SWRCB DDW. G. All lift stations shall have a street address sign affixed to the fence at the front of the station. H. Site shall be provided with a lighting system designed to minimize off site impacts while maintaining functionality for maintenance personnel working on lift station components. As a minimum, each site shall be provided with an "area light" activated by a photocell and a 150W "work light" activated by a manual switch located in the Main Control Panel. "Area light" shall comply with County of Riverside Ordinance Number Regulating Light Pollution. 8

19 Last Update: 07/12/16 I. Odor control components include: concrete slab for emergency shower and eyewash station, concrete pad for District furnished chemical storage tank, 120v receptacle for District furnished chemical feed pump, and conduit sleeve from receptacle stanchion to wet well. Emergency shower and eyewash station slab shall be located on the side of the chemical tank pad where the chemical delivery truck will be logically positioned. J. If required by the District, based on the location of the facility, a microwave and radio communications tower shall be provided for District SCADA communications at developer's expense. VI. Force Main A. Force main size (diameter) shall be based on the following: 1. Lift station design flow rate (one pump operating) with minimum velocity of 3 fps and maximum velocity of 6 fps. 2. Minimum size shall be 4-inch inside diameter. Where 4-inch mains are required, two (2) parallel pipelines shall be constructed for system reliability. Each force main shall be provided with the necessary valves and fittings to allow operation of either force main or both force mains. 3. Where a single 4-inch force main is inadequate to convey the peak flow rate (i.e. force main velocity exceeds maximum allowable velocity), the next larger size pipe diameter shall be used. 4. Where force main length exceeds 6,000 L.F., two (2) parallel pipelines shall be constructed for system reliability. Each force main shall be provided with the necessary valves and fittings to allow for operation of either force main or both force mains. B. Material shall be PVC per ANSI/AWWA C900 (minimum DR-18). Pipeline shall be constructed using restrained joints per District Standard Drawing B-663. C. Pipeline profile shall avoid intermediate high points if feasible. All high points shall be provided with combination sewage air and vacuum valve installation and special corrosive resistant pipeline materials. D. Onsite pipe cover shall be minimum 36-inches. 9

20 Last Update: 07/12/16 E. Separation from water lines shall be in accordance with SWRCB DDW. Additionally, a minimum 10-foot horizontal clearance shall be provided from site walls, site fencing, electrical facilities, storm drain facilities, and gravity sewer. F. Where force main connects to a new or existing discharge manhole, the discharge manhole shall be lined per Standard Detailed Provision Section at developer's expense. The District may require multiple manholes be lined at developer's expense. VII. Lift Station A. Raw sewage lift station shall be the submersible type with 100% redundancy, electrical service, switchgear, emergency power (if required by the District), and appurtenances. Standard Drawings M-1A, M-1B, M-2, and ME-1 are provided to present equipment and piping plans, sections, and details for the lift station. B. Raw Sewage Pumps 1. Number of pumps furnished shall provide complete redundancy. Minimum of two identical pumps each sized for 100% station capacity shall be installed. Typically, constant speed pumps will be provided; however, discharge to the downstream system may require use of variable speed drives. 2. Pump Requirements a. Raw sewage non-clog submersible pumps. Pump impellers shall be enclosed single port, recessed vortex, or grinder type. The specific pump impeller type to be used for the project will be determined by the District based on application and availability. b. Minimum 4-inch discharge. c. Ability to pass minimum 3-inch diameter sphere. d. Maximum 1800 rpm explosion-proof submersible motor with moisture and temperature sensors. e. Motor and cooling rating suitable to run dry for 15 minutes without damage to the pump. f. UL or Factory Mutual explosion-proof rating without being submerged. 10

21 Last Update: 07/12/16 g. Constructed of corrosion resistant materials and provided with corrosion resistant factory coating. h. Acceptable manufacturers are Essco, Wilo-EMU, Fairbanks-- Nijhuis, Wemco Flowserve, Xylem-Flygt, and ABS. i. Prior to acceptance, pump tests shall be performed to verify pump curves and system head curves. 3. Pump Mounting and Removal a. Provide rail-type guide system with intermediate supports to allow pump removal without removal of discharge piping or entering the wet well. All materials to be 316 stainless steel. b. Provide 316 stainless steel cable or chain fastened to each pump. The District will utilize their crane truck for removal of pumps. c. Electrical cable(s) shall be spliced at a junction box located 30- inches above wet well roof and meet all provisions of the NEC. 4. Spare parts shall include one set of seals and bearings. C. Wet Well Requirements 1. Class IV reinforced concrete pipe (RCP) per ASTM C76 with two circular reinforcement cages (quadrant or elliptical cages will not be allowed) and flush bell and spigot joints. Bell and spigot joints shall be provided with rubber gaskets and shall be suitable for a hydrostatic head of 50 feet per ASTM C361. Wet well shall also include reinforced concrete base and cover. Wet well reinforced concrete base shall be placed on a 12-inch thick mat of crushed miscellaneous base per SSPWC Section , Fine Gradation. Interior concrete surfaces ( including wall and roof) shall be coated with a field applied 100% solids epoxy lining system by Carboline, Sauereisen, or Tenemec per District Standard Small Submersible Sewage Lift Station Specifications. Wet well bottom shall be provided with concrete fillets sloping towards the pumps. 2. Wet well shall be sized based on maximum pump motor cycling time of six starts per hour at 1/2 design capacity and to provide adequate spacing for installation of two pumping units (see Table on Standard Drawing G-1 for wet well size versus flow capacity). 11

22 Last Update: 07/12/16 3. Concrete roof shall have a hatch opening (one hatch for both pumps) for pump removal/installation. Hatches shall be all stainless steel construction as manufactured by U.S.F. Fabrication, Flygt, Bilco, or equal, with lockable diamond plate covers, safety chain, spring assisted hinges, and swing-out interior safety grating. Portable temporary handrail system (Railguard 200 by Garlock Safety Systems, or equal) shall be provided around hatch opening. 4. Discharge piping inside the wet well shall be flanged, Schedule stainless steel. All stainless steel piping, fittings, and flanges shall be shop welded (field welding not permitted except where noted on District Standard Drawings). All welds shall be pickled and passivated in the shop (pickling paste shall be applied to District approved field welds). Discharge piping shall be designed for a maximum velocity of 6 to 8 feet per second. Discharge piping shall be properly supported with pipe supports. 5. Pipe supports, brackets, and all other equipment and fasteners within the wet well shall be 316 stainless steel. 6. All collection sewers shall join and enter a single manhole just prior to entering the wet well. Only one sewer shall enter the wet well to allow the District to plug influent sewer and bypass around wet well for maintenance and repairs. D. Pump Discharge Piping Out of Wet Well 1. Discharge from each pump shall exit the wet well below grade, then rise above grade for location of check valves and isolation plug valves. 2. Each pump shall be provided with 150 lb swing check valve (AWWA C508 with bronze trim) and shut-off valves (eccentric non -lubricated plug valve). Sewage combination air and vacuum valves shall be provided at high points. 3. A bypass connection to the force main shall be provided for station bypass with portable pumps. 12

23 Last Update: 07/12/16 VIII. Electrical and Controls A. All electrical equipment shall be in accordance with the NEC and, where applicable, meet all requirements for hazardous locations. Developer shall coordinate with the electrical utility providing electrical service. Station shall be provided with a separate utility transformer and metering section with main circuit breaker. Utility transformer and metering section shall be located in a separate fenced-in area (see Typical Site Plan s). Primary power to the station shall be 480 volt, 60 Hz, 3-phase service per utility providers' standards. Singlephase 120-volt power shall be provided for lights, controls, convenience receptacles, and miscellaneous equipment. Provide a minimum of four spare 20A, 120-volt circuit breakers. All conduit shall be run concealed below grade or in concrete slabs, and shall not impose tripping or maintenance hazards. All exposed conduit shall be pvc-coated rigid steel pipe. B. Electric switchgear shall be mounted in a NEMA 1 gasketed enclosure (with NEMA 3R wrapper) Motor Control Center with removable buckets, and shall include, as a minimum, main circuit breaker, motor starters with thermal overload protection, selector switch (hand -off-auto), run and fail lights, and elapsed time meter as shown on Standard Drawings E-2A and E-2B. Switchgear shall be General Electric, Eaton/Cutler Hammer, Allen-Bradley, or Schneider Electric/Square D (no substitutes). The MCC doors shall face north or east. C. Complete controls for automatic pump operation shall be provided per Standard Drawing E-3. D. An electrical panel sunshade structure shall be provided per Standard Drawing S- 2. E. Separate sunshades shall be provided to protect any items that can deteriorate from exposure to the sun and are not protected by the electrical panel sunshade structure. F. An electrical short circuit/coordination study, arc flash hazard study, and field testing of the electrical system shall be performed. IX. Emergency Power If required by the District, lift station facilities shall include permanent emergency power generation facilities. These facilities shall consist of an engine driven emergency power generator with integral fuel storage tank and an automatic transfer switch. Lift stations not requiring permanent emergency power generation facilities shall be provided with a manual transfer switch that will allow connection of a District portable emergency power generator. 13

24 Last Update: 07/12/16 Permanent emergency power generation facilities shall conform to the following: A. Provide a prefabricated skid-mounted diesel engine driven, radiator-cooled, automatic emergency standby generator to power the lift station during normal power failure. B. Generator set shall be as manufactured by Olympian (supported by Caterpillar), Caterpillar, Cummins, or Generac. C. Generator set shall automatically start upon failure of normal power and be sized to operate lighting loads, and both pumping units (duty and standby) with maximum voltage DIP of 20 percent. D. Generator set shall be provided with a weatherproof sheet metal housing. Exhaust system shall be fully insulated and equipped with a critical grade silencer. E. Generator set shall be equipped with all sound attenuating equipment, enclosures, and devices necessary to conform with applicable city or county noise ordinances. Design Engineer shall supplement the requirements of Detailed Provisions provided herein (Section 11200) with all generator sound attenuating measures necessary to comply with the applicable noise ordinances. F. Fuel tank for generator shall be base type mounted with unit. Tank shall be double walled welded steel sized for a minimum of 24 hours of continuous operation at 100% of generator capacity. Tank shall have secondary containment and alarm floats for low fuel and fuel in secondary containment area. Facilities shall meet local fire department criteria. A full tank of fuel shall be provided at developer's expense at the completion of construction. G. Generator set shall be "pre-certified"/"pre-approved" by South Coast Air Quality Management District (SCAQMD) for emergency standby power service, and shall meet all current SCAQMD air emission regulations. A Level 3 diesel particulate filter (DPF) verified by California Air Resources Board shall be provided at the developer's expense if required to meet the emission requirements of SCAQMD Rule Developer's engineer shall determine whether a passive DPF or active DPF will be required. For a passive DPF to be considered, it must operate at exhaust temperatures that are low enough not to require a load bank for regeneration. Developer's engineer shall submit the DPF to the District along with technical data and supporting calculations for review and acceptance. 14

25 Last Update: 07/12/16 All SCAQMD permits, including payment of fees for the first year of operation shall be furnished by developer. Permits shall have no less than a 200 hour annual operating limit with no less than 50 hours for maintenance and testing. The SCAQMD permit to construct shall be transferred into a permit to operate prior to acceptance by the District. H. Generator shall have the highest available tier rating, in accordance with EPA Tier Certification requirements. I. Automatic transfer switch (ATS) shall be provided to switch from normal utility power to standby emergency power upon normal power fail, and switch back to normal power when restored. ATS shall have indicating lights for normal power, emergency power, and a digital panel indicating volts and amps. Acceptable manufacturers are Olympian, ASCO, or Russelectric. J. If the District requires the developer to provide a standby generator that is larger than what is necessary to support the proposed lift station equipment (based on future development flows to the lift station), then the developer shall provide a load bank sized to provide the difference between the proposed equipment load and the future equipment load. X. Telemetry Equipment District will furnish, install, and program telemetry equipment system, including remote telemetry unit (RTU) to transmit alarm conditions to existing SCADA system. Contractor shall terminate all alarm signals on terminal blocks in the Main Control Panel (MCP) as shown on Standard Drawing E-4. Contractor shall connect from MCP terminal blocks to District furnished RTU terminal block. 15

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27 APPENDIX A SAMPLE DESIGN CALCULATIONS

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39 TABLES

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41 Last Update: 07/12/16 TABLE 1 RELATED DISTRICT STANDARD DRAWINGS Refer to the latest Standard Drawings located at the following web site ( Standard Dwg. No. Description B-286B Trench Backfill (for PVC forcemain) B-590 5/8" Meter Service Connection, 1" Copper Tubing B-590A 5/8" Service Connection, 1" Copper Tubing B-591 1" Meter Service Connection, 1" Copper Tubing B-591A 1" Service connection, 1" Copper Tubing B-597 Backflow Prevention Assembly Installation Diagram B-656 Location Wire Installation B-663 Standard Restraint (Tee, Dead End, Bend) B-665 Guard & Marker Posts D-672 Chain Link Fence Details SB-08 Locking Type Manhole Cover & Frame SB-30 Reinforced Precast Shallow Manhole SB-53 Precast Reinforced Concrete, 48" & 60" I.D. Manhole SB-56 Precast Non-Reinforced Concrete, 48" I.D. Manhole SB-61 Manhole Cover & Frame SB-157 Pipe Zone Bedding for Sewer Pipe SB-158 Trench Backfill for Sewer Pipe SB-159 Classification of Pipe Zone Bedding for Sewer Pipe Sewer Guideline for Manhole Sizing *Refer to the latest Guideline Standards located at the following web site: (

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43 DETAILED PROVISIONS

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45 Revised 07/12/16 SPECIFICATIONS - DETAILED PROVISIONS Section Temporary Sewage Lift Station Demolition C O N T E N T S PART 1 - GENERAL DESCRIPTION REFERENCE SPECIFICATIONS, CODES, AND STANDARDS CONTRACTOR SUBMITTALS JOB CONDITIONS... 2 PART 2 - PRODUCTS IMPORTED FILL MATERIAL... 3 PART 3 - EXECUTION GENERAL POLLUTION CONTROL PROTECTION EQUIPMENT, PIPING, AND APPURTENANCES CONCRETE STRUCTURES AND IMPROVEMENTS SITEWORK EXISTING UTILITIES DISPOSAL OF DEMOLISHED MATERIALS PATCHING AND REPAIRING CLEANING SALVAGE... 9

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47 Temporary Sewage Lift Station Demolition SECTION TEMPORARY SEWAGE LIFT STATION DEMOLITION PART 1 - GENERAL 1.01 DESCRIPTION A. The Contractor shall furnish all labor, materials, and equipment necessary to perform and complete demolition work specified herein. B. The Work includes demolition of existing temporary sewage lift station facilities, abandonment of existing force main and gravity sewer, and re-construction of gravity sewer manhole(s). Existing lift station facilities to be removed and disposed, removed and salvaged, or to remain are summarized in Exhibit A attached at the end of these specifications. C. Contractor shall comply with the requirements of the District, government agencies, and utilities having jurisdiction over the work, such as, but not limited to: work in the public right-of-way (if applicable), hours of work, and removal of utilities. D. Re-construction of gravity sewer manhole(s) may require work to be performed within the public right-of-way. Contractor shall apply for and procure all permits and licenses, including encroachment permits required by the City or County having jurisdiction over the right-of-way. Contractor shall give all notices necessary and incidental to the prosecution of the work. It is the responsibility of the Contractor to contact the jurisdictional agency and make himself knowledgeable of their requirements. E. Demolition shall include the cost of "Final Disposal" of all debris, waste, and rubbish in a manner that complies with all local, state, and federal laws, regulations, and ordinances REFERENCE SPECIFICATIONS, CODES, AND STANDARDS The Work covered under this Section shall comply with current editions of the following specifications, codes, and standards: A. District Detailed Provisions Section 01000, General Safety Requirements B. California Building Code C. National Electrical Code

48 Temporary Sewage Lift Station Demolition D. State and Federal Occupational Health and Safety Administration (OHSA) Standards 1.03 CONTRACTOR SUBMITTALS Contractor shall provide submittals in accordance with the General Conditions, Section F - Labor and Construction. Submittals shall include, but shall not be limited to, the following: A. Demolition Schedule Prior to commencing demolition activities, Contractor shall submit for District's approval a complete coordination schedule for all demolition work, including shut-off of lift station pumping units, and deactivation and removal of electric power service to ensure uninterrupted sewage conveyance. B. Encroachment Permit Where work is required to be performed in the public right-of-way, Contractor shall submit a copy of the encroachment permit obtained from the City or County agency having jurisdiction over the right-of-way. C. Preconstruction Video Contractor shall prepare a video recording in the presence of the District's Inspector showing the existing lift station site, lift station facilities, and condition of structures and improvements adjacent to areas of demolition and alteration. Copies of the video recording shall be submitted to the District's Inspector prior to commencing work. D. Insurance Certificates Contractor shall not commence work until he has obtained all insurance required under the District's General Conditions, Section F Labor and Construction. Contractor shall submit all necessary documents to demonstrate compliance with the District's insurance requirements, including Worker's Compensation Insurance Certificate and Certificate of Liability Insurance. E. Hot Work Permit Prior to initiating hot work, Contractor shall submit a Hot Work Permit application to the District. Hot work includes, but is not limited to, any work involving grinding, cutting, torching, welding, soldering, brazing, powder-actuated tools and all other similar applications producing a spark, flame, or heat that is capable of initiating fires or explosions JOB CONDITIONS District assumes no responsibility for actual condition of the existing lift station facilities to be demolished. The Contractor shall visit the site and inspect the existing facilities, to ascertain their condition and impact on demolition activities.

49 Temporary Sewage Lift Station Demolition Existing lift station facilities pump raw sewage from the District's gravity sewer collection system. Contractor shall assume that all lift station piping, wet well and associated appurtenances are filled with raw sewage, including grease, grit, and debris. Prior to commencing demolition of lift station facilities, Contractor shall dewater and clean said facilities as necessary and as specified herein. PART 2 - PRODUCTS 2.01 IMPORTED FILL MATERIAL All imported fill material shall be select soil material, non-expansive with an expansion index of less than 20, free of vegetative matter and other deleterious substances, granular with a Sand Equivalent (SE) greater than 30, and shall not contain rocks or other irreducible matter with a maximum dimension greater than 4 inches. Fill material shall be approved by the District prior to use onsite. PART 3 - EXECUTION 3.01 GENERAL A. Contactor shall not commence with lift station demolition activities until receipt of District's written direction to proceed. Contractor shall not interrupt sewage conveyance at any time during demolition work. The first demolition work activity shall consist of diverting sewage from the lift station wet well or onsite bypass manhole to the gravity collection system. Contractor shall reconfigure the diversion manhole to the lift station or onsite bypass manhole to block sewage conveyance to the lift station facilities and open up conveyance to the gravity collection system. Contractor shall maintain continuous conveyance of raw sewage throughout reconfiguring the manhole base. B. All demolition work shall be completed within 90 days, commencing from the time the new sewer is placed in-service. Prior to commencing demolition work, Contractor shall submit a written request to District for additional time if demolition work is anticipated to take longer than 90 days. C. Site grading and compaction shall be performed as specified herein. Relative compaction of 95% shall mean soil compacted to a dry density exceeding 95% of the maximum dry density in accordance with ASTM D Compaction testing will be provided by the District. However, any costs for retesting of compaction due to the Contractor's negligence shall be paid for by the Contractor.

50 Temporary Sewage Lift Station Demolition POLLUTION CONTROL A. Water sprinkling, temporary enclosures, chutes, and other suitable methods shall be used to limit dust and dirt rising and scattering in the air. Comply with government regulations pertaining to environmental protection. B. Water shall not be used when it creates hazardous or objectionable conditions such as erosion, flooding, or pollution. C. Water contaminated with sediment or hazardous or toxic materials shall not be allowed to run off into the public storm drain system (including street gutters). Such runoff shall be intercepted, collected and disposed of according to existing environmental regulations PROTECTION A. Contractor shall perform his operations so that existing improvements which have not been designated for demolition are not damaged, including roads and other paved surfaces adjacent to or in the vicinity of the work site. Contractor shall repair and restore any disturbed or damaged private or public improvements which results from his operations (except that which is specifically a part of the Contract Work) to the satisfaction of the District, or the agency having jurisdiction over said improvements, all at the Contractor's expense. B. Interior and exterior shoring, bracing, or supports shall be provided to prevent sudden collapse of structures to be demolished and to prevent movement, settlement or collapse of adjacent facilities to remain. C. Existing vegetation, landscaping materials, structures, and appurtenances, which are not to be demolished, shall be protected and maintained as necessary. D. Provide safeguards, including warning signs, barricades, temporary fences, warning lights, and other similar items that are required for protection of work personnel and public during demolition and removal operations. Maintain fences, barricades, lights, and other similar items around exposed excavations until such excavations have been completely backfilled and no longer constitute a hazard or dangerous condition. Excavations in the public right-of-way shall be completely backfilled or covered with vehicle safety plates at the end of each work day. E. During demolition activities, Contractor shall protect all nearby existing equipment such as the motor control center and main control panel from dust caused by demolition activities by covering with drop-curtains or other similar methods.

51 Temporary Sewage Lift Station Demolition F. Demolition work involving grinding, cutting, torching, welding, or similar applications producing a spark, flame, or heat that is capable of initiating fires or explosions ( "hot work") shall be performed in conformance with OSHA 29CFR and NFPA 51B at a minimum. Prior to commencing any hot work, Contractor shall obtain a Hot Work Permit from the District and confirm that all fire prevention and protection requirements have been implemented EQUIPMENT, PIPING, AND APPURTENANCES A. All mechanical and electrical equipment shall be disconnected and removed. Mechanical and electrical equipment to be salvaged for the District is designated in Section 3.11 herein. Equipment and appurtenances not listed therein shall be considered waste and shall be disposed of by the contractor. B. All equipment, piping, and appurtenances inside the wet well shall be removed. Wet well discharge piping embedded in remaining wet well wall sections (deeper than 5 feet) shall be abandoned in-place. Contractor shall furnish and install blind flanges at the end of the remaining pipe spools. C. All above grade discharge piping, valves, and appurtenances shall be removed. Vertical pipe risers shall be removed to below grade transition with horizontal piping. Below grade horizontal piping runs deeper than 48 inches shall be abandoned in-place. The appropriate blind flanges, caps, threaded plugs, etc. shall be provided at the ends of all abandoned piping. Contractor shall flush the sewage force main piping to be abandoned with water, and then fill the piping with control density fill per District Detailed Provisions Section Contractor shall review the District's as-built drawings for the existing sewage force main(s) to determine the extent of the filling and conditions affecting same. Contractor shall plug the end of the sewage force main(s) at the discharge manhole to prevent any control density fill from entering the manhole and gravity sewage collection system. Contractor shall provide observation personnel at the discharge manhole during filling operations to ensure the integrity of the force main plug is maintained. D. All miscellaneous above grade mechanical and electrical appurtenances such as air valves, pipe supports, electrical receptacles, light fixtures, poles, and foundations, shall be removed and disposed. E. All electrical conductors shall be disconnected from the associated equipment and removed from the conduit. All above grade conduit shall be removed. Vertical conduit risers shall be removed to below grade transition with horizontal conduit. Below grade horizontal conduit runs deeper than 36 inches shall be abandoned in-place. Conduit caps shall be provided at the ends of all abandoned conduit.

52 Temporary Sewage Lift Station Demolition F. Voids created by removal of below grade facilities and appurtenances shall be backfilled with select fill material compacted to 95% minimum relative compaction CONCRETE STRUCTURES AND IMPROVEMENTS A. Demolition shall proceed in a systematic manner, in accordance with all permits and approved submittals. B. All concrete structures and improvements shall be demolished and disposed. As a minimum, concrete structures and improvements to be demolished include: wet well roof, upper 5 feet of wet well shaft, electrical panel foundation slab, standby generator foundation slab, discharge piping support slab, odor control chemical tank support slab, SCE transformer support slab, below grade electrical pull boxes and vaults, and site lighting pole foundations. At lift station installations where gravity sewage will no longer enter the site, the onsite bypass manhole shall be demolished, which shall consist of removal of the manhole roof/cone and the upper 5 feet of the manhole shaft. C. Concrete walls and roofs shall be demolished in sections. Contractor shall provide bracing and shoring as necessary to prevent structure collapse. D. Prior to commencing lift station wet well demolition, Contractor shall dewater and clean the wet well, and remove all equipment and appurtenances. Contractor shall then remove submersible sewage pumping units, including base elbows, guide rails and support brackets, access stabilizer, float switches and ultrasonic level transducer or bubbler system, discharge piping, pipe supports, and all related items. Following wet well cleaning and equipment removal, Contractor shall commence wet well demolition. Contractor shall remove wet well roof and upper wet well shaft sections to a minimum depth of 5 feet below existing or ultimate finished grade, whichever is greater. Contractor shall core drill the wet well foundation in 4 places, equally spaced. Each core drill shall be 12-inch diameter. Contractor shall fill the remaining wet well shaft with sand (minimum SE of 30) compacted to 90% relative compaction. The remaining wet well excavation (upper 5 feet or more) shall be backfilled with select fill material and compacted to 95% minimum relative compaction. E. Unless specified otherwise, footings, foundation walls, below-grade construction and concrete slabs on grade shall be demolished and removed to a depth which will not interfere with new construction, but not less than 24 inches below existing ground surface or future ground surface, whichever is lower. All below