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Soil Sampling Workplan Former Manufactured Gas Plant—Lodi,California 2.0 BACKGROUND The following sections briefly describe current Site conditions, the Site history, site-specific geology and hydrogeologic conditions, and the known nature and extent of impacts encountered on-site during previous investigations, as reported in the RI Completion Report (Stantec, 2010a), Revised Remedial Refinement Investigation Report (Stantec, 2011a), and Draft Final RAW (Stantec, 2011b). More detailed information related to the Site history, results of previous investigations, and Site conditions are presented in the Draft Final RAW(Stantec,2011b). 2.1 SITE LOCATION AND DESCRIPTION The Site is located at 712 South Sacramento Street in an industrial area of the City of Lodi, California, San Joaquin County. The Site and vicinity are zoned for heavy industrial uses, and the Site is currently classified by the City of Lodi as a developed vacant industrial land. The Site is bordered by Jorge's Auto Body to the north, South Sacramento Street to the west, Union Pacific Railroad to the east,and a vacant lot to the south owned by Lodi Iron Works (Figure 2). The closest residences are situated west of the Site across Sacramento Street. The Site is secured with a perimeter chain-link fence,and access to the Site is via a gate at Sacramento Street. The Site is listed by San Joaquin County with assessor parcel number(API) 045-036-600. The Site (an approximate 0.73 acre lot) is situated at 47 feet above mean sea level and is generally flat with a regional west to southwest topographic gradient. The Site is currently vacant and unoccupied. The only physical features present at the Site include several concrete pads associated with former Site features (Figure 2). The majority of the Site surface consists of dirt, and a small portion of the Site near the gated entrance consists of degraded asphalt. The concrete footing associated with the former general shop and store room building is visible in the northwest corner of the Site and the top of the concrete foundation associated with former gas holder#3 is present in the southwest section of the Site between the surface and 0.5 feet below grade. Concrete footings associated with the former gas holder#1 and the former automobile garage located in the northeast corner of the Site, are still present. Miscellaneous trees, shrubs, and vegetation are located along various sections of the Site perimeter. 2.2 SITE HISTORY An MGP operated at the Site from 1913 until 1928 when it was decommissioned due to the availability of natural gas in the area. The MGP occupied the Site, referred to as Parcel B, and an approximate 25-foot wide section of South Sacramento Street located along the Site's west property limit, referred to as Parcel A (Figure 3). The general MGP process included the production of gas from crude oil in generators and retorts, scrubbing in purifiers, and temporary storage of gas in gas holders. MGP facilities that were present at the Site included: two gas holders along the west property limit at South Sacramento Street; general shop and store room building (meter house) in the northwest corner of the Site;lampblack separators located in the southeast quadrant of the Site; a generator and boiler building and sump in the central portion of the Site; and, three purifiers, a third gas holder, a water tank with two water supply wells, an auto garage building, and two former TERRA PACIFIC GROUP Page 6 October 19, 2012