RELEASE TRACKING NUMBER December Prepared For: New England Gas Company P.O. Box 911 Fall River, Massachusetts

Transcription

1 RELEASE ABATEMENT MEASURE COMPLETION REPORT REGULATOR DECOMMISSIONING AND WATER SERVICE LINE REPAIR 120 CHARLES STREET FALL RIVER, MASSACHUSETTS RELEASE TRACKING NUMBER December 2010 Prepared For: New England Gas Company P.O. Box 911 Fall River, Massachusetts Prepared By: Innovative Engineering Solutions, Inc. 25 Spring Street Walpole, Massachusetts (508)

2 RELEASE ABATEMENT MEASURE COMPLETION REPORT REGULATOR DECOMMISSIONING AND WATER SERVICE LINE REPAIR 120 CHARLES STREET FALL RIVER, MASSACHUSETTS RELEASE TRACKING NUMBER December 2010 Prepared for: Prepared by: New England Gas Company P.O. Box 911 Fall River, Massachusetts Innovative Engineering Solutions, Inc. 25 Spring Street Walpole, Massachusetts Michael Lotti, L.S.P. Project Manager and LSP of Record License Number 4208 Joseph E. Higgins, P.E., L.S.P. Project Reviewer

3 Release Abatement Measure Completion Report Regulator Decommissioning and Water Service Line Repair 120 Charles Street Fall River, Massachusetts DEP Release Tracking Number: Pursuant to the Massachusetts Contingency Plan (MCP) (310 CMR ), this Release Abatement Measure (RAM) Completion Report has been prepared by Innovative Engineering Solutions, Inc. (IESI) on behalf of New England Gas Company (NEGC), a division of Southern Union Company. This RAM Completion Report presents the activities that were conducted at the 120 Charles Street property in Fall River, Massachusetts (the Property ) to manage soil generated during the decommissioning of a natural gas regulator and associated equipment (located along the southern edge of the Property) and to repair a leaking water service line (located along the northern edge of the Property). Refer to Figure 1 for a Site Locus and Figure 2 for a Site Plan of the Property. The Property is the location of a former manufactured gas plant (MGP) and is a Site as defined by the MCP. Response actions are ongoing, and the Site is listed as a Tier II Site in Phase II of the MCP. The content of this RAM Completion Report has been structured to address the specific information requirements set forth in 310 CMR (4)(a) through (f). The RAM Completion Report has been submitted electronically via edep. 310 CMR (4)(a) a description of the release or threat of release, site conditions, and surrounding receptors; Description of the Release The Property is a 15 acre parcel owned and operated by NEGC as a liquefied natural gas (LNG) storage and natural gas distribution facility. The Property has been owned and operated by NEGC since Prior to 2000, the Property was owned and operated by the Fall River Gas Company or its predecessor companies dating back to the early 1900s. The Property was operated as a MGP beginning in Operations included the manufacturing of coal gas and water gas. The plant was converted to natural gas operations in The excavation activities to facilitate the natural gas regulator removal and the water service line repair were conducted as a RAM because the proposed excavation areas are located within the Site boundary. As such, compounds associated with the former MGP operations could be present in soil and groundwater. Site Conditions The Property is located on 120 Charles Street in Fall River, Massachusetts. Universal Transverse Mercator (UTM) coordinates for the property are 4,617,145 meters north and 317,964 meters east. The 15 acre property contains 23 buildings associated with the operation of the LNG and natural gas distribution facility. A description of the buildings and the physical Site is presented in the Phase I Initial Site Investigation Report and Tier Classification prepared by ENSR Corporation and submitted to the MassDEP in November The excavation areas that are the subject of this RAM are shown on Figure 2. Access to the Property and RAM areas are restricted by a locked chain link fence that surrounds the entire property. O:\New England Gas\NEG100 - Charles St. Fall River\Regulator RAM Sep-2010\RAM Completion.docx Page 1 Innovative Engineering Solutions, Inc. February 2010

4 Surrounding Receptors The residential population within a one-half mile radius is estimated at greater than 2,000 people. No institutions, as defined by of the MCP, are located within 500 feet. Commercial and industrial properties border the Site to the south with residential and vacant lots to the east and north. The nearest residence is located approximately 150 feet east of the Property. According to MassGIS, except for Mount Hope Bay, which borders the former MGP to the west, no surface water bodies, including vernal pools, ponds, lakes, streams, rivers, Outstanding Resource Waters, and reservoirs, are located within 500 feet of the Site. In addition, there are no Areas of Critical Environmental Concern, habitats for Species of Special Concern or Threatened or Endangered Species, or protected open spaces within 500 feet of the RAM area. The Site is not located within any Current or Potential Drinking Water Source Areas as defined by the MCP. Drinking water is supplied to the area by the City of Fall River. It is not known if private wells are located in the vicinity; however, it is unlikely that private water supply wells are located in the vicinity of the RAM area given the urban nature of the surrounding area. 310 CMR (4)(b) a description of the Release Abatement Measure completed at the disposal site, including work undertaken in response to any conditions of approval imposed by the Department; As detailed in the RAM Plan submitted in September 2010, this RAM was initiated to monitor, manage, and, if necessary, dispose of excess soil generated as part of the decommissioning of a natural gas regulator and associated equipment (located along the southern edge of the Site) and to repair a leaking water service line (located along the northern edge of the Site). On November 9, 2010, NEGC personnel began removal of the natural gas regulator located on the southern portion of the Property (see Figure 2). During the regulator removal a small (nine feet by five feet) area was excavated to five feet below grade to expose the piping and equipment associated with the natural gas regulator. During excavation, the ambient air was monitored for volatile organic compounds (VOCs) using a photoionization detector (PID) calibrated with an isobutylene standard to respond as parts per million (ppm) benzene. PID responses above background (0.0 ppm) were not observed in ambient air. In addition, soil samples were collected periodically and screened in the field for VOCs using a PID. There were no PID responses to soil headspace greater than background (ranged from 0.0 to 1.0 ppm). All soil excavated was returned to the excavation. Also on November 9, 2010, NEGC personnel excavated soil in the area of the leaking water line located on the northern edge of the Property (Figure 2). The area excavated was approximately four feet wide, 15 feet long and six feet deep. The larger excavation was necessary to locate the leak in the water line. As described above, during excavation, ambient air was monitored for VOCs using a PID. PID responses above background were not observed in ambient air. Soil samples were also collected periodically and screened in the field for VOCs with the PID. There were no PID responses to soil headspace greater than background (ranged from 0.0 to 1.0 ppm). During the repair work, approximately 50 to 100 gallons of water (likely a mixture of potable water leaked from the water line and groundwater) were pumped from the excavation and discharged to another small excavation located immediately up gradient (east) of the water line excavation. The leak was found, repaired and the excavation was backfilled immediately. All soil excavated was returned to the excavation. O:\New England Gas\NEG100 - Charles St. Fall River\Regulator RAM Sep-2010\RAM Completion.docx Page 2 Innovative Engineering Solutions, Inc. February 2010

5 310 CMR (4)(c) all investigatory and monitoring data obtained during the implementation of the Release Abatement Measure; The work associated with this RAM was conducted in accordance with a Site specific Health and Safety Plan which was included as part of the RAM Plan submittal. In accordance with the Health and Safety Plan, when subsurface soils were disturbed or managed, routine monitoring of the ambient air for total volatile organics was conducted with a PID. The PID was calibrated with a 100 ppm isobutylene reference standard to respond as benzene. There were no ambient air PID responses observed greater than background during the regulator removal or water line repair work. As stated above, soil samples were only collected for field screening. There were no soil samples collected for laboratory analysis. 310 CMR (4)(d) a succinct statement of findings and conclusions resulting from implementation of the Release Abatement Measure, including a statement as to whether the objectives of the Release Abatement Measure have been met; The objectives of this RAM were to monitor, manage, and, if necessary, dispose of excess soil generated as part of the regulator removal and water line repair. This objective was accomplished. 310 CMR (4)(e) details and documentation on the management of any Remediation Waste, Remedial Wastewater and/or Remedial Additives managed at the site as part of the Release Abatement Measure; As stated above, all excavated material was returned to the excavation. There was no remediation waste generated as part of these RAM activities. 310 CMR (4)(f) a description of any ongoing activities related to the Release Abatement Measure that will be conducted at the disposal site, including monitoring activities, and the maintenance of fences, caps, and other passive systems. No further activities associated with this RAM will be conducted at the Property. If additional information is needed or questions regarding this plan arise, please contact Michael Lotti by telephone at (508) x 231 or by at m.lotti@iesionline.com. O:\New England Gas\NEG100 - Charles St. Fall River\Regulator RAM Sep-2010\RAM Completion.docx Page 3 Innovative Engineering Solutions, Inc. February 2010

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