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GeosyntecO <br /> consultants <br /> of wastewater containing dissolved dry-cleaning fluids into the sanitary-sewer lines <br /> connected to each of the facilities (LFR, 1999). The historical waste-disposal activities <br /> and documented spills have affected soil and groundwater beneath the site. Hazardous <br /> substances, primarily tetrachloroethene (PCE), migrated downward to groundwater <br /> beneath each of the former dry-cleaning facilities and beneath the sanitary-sewer lines, <br /> through leaks and cracks in the sewer lines serving the former dry-cleaning facilities <br /> (LFR, 1999). Impacts to groundwater associated with these releases extend from <br /> Gettysburg Place to east of Inglewood Avenue in the A- and B-Zone aquifers. The <br /> groundwater plume also contains PCE degradation products including trichloroethene <br /> (TCE), 1,2-dichloroethene(1,2-DCE), and vinyl chloride. <br /> The highest concentrations of PCE and other VOCs are reported in the A-Zone aquifer. <br /> As a result of the construction of former groundwater monitoring well MW-02113, <br /> hazardous substances appear to have migrated from the upper part to the lower part of <br /> the B-zone aquifer. Similarly, migration of groundwater containing certain dissolved <br /> hazardous substances from the A-Zone aquifer to the C-Zone aquifer appears to have <br /> been caused for a limited period of time by a damaged well casing in the former <br /> municipal-water-supply well known as Lincoln Village Maintenance District <br /> (LVMD)#1. LVMD #1 was abandoned to mitigate further migration of hazardous <br /> substances(LFR, 1999). <br /> 2.2.1 Summary of Interim Remedial Actions <br /> IRAs at the site have been implemented in phases beginning with Phase I initiated in <br /> 1998 through Phase V completed in 2008. The GWETS, including wells installed as <br /> part of Phase I and Phase III remedial actions, and the subsurface conditions associated <br /> with the Phase V injection well area are the subject of this Work Plan and are discussed <br /> below. <br /> 2.2.1.1 Groundwater Extraction Treatment System <br /> Construction of the Phase I GWETS was completed in September 1998, and full-scale <br /> operation began in November 1998 (LFR, 1999). The Phase I IRA groundwater <br /> extraction system consists of 17 A-Zone groundwater extraction wells (GEW-1 to <br /> GEW-17) spaced at approximately 100-foot intervals along the eastern property <br /> boundary of Lincoln Center, adjacent to Pacific Avenue. The groundwater is pumped <br /> via a double-contained conveyance pipeline that connects the 17 groundwater extraction <br /> wells to the Treatment System Compound (TSC) located on Lincoln Center near the <br /> northeastern comer of Douglas Avenue and Gettysburg Place. Groundwater discharge <br /> from the GWETS is currently governed by the National Pollutant Discharge <br /> Pre-Design Investigation Work Plan 7 18.05.12 <br />