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• • Workplan for Phase it Subsurface Investigation 3190 Auto Center Circle Stockton,California 95212 Partner Project Number 81147 March 10,2009 Page ( 3 Soil samples will be prepared for laboratory analysis by cutting approximately 0.5-foot long sections of the liners at the desired sampling depths using a hacksaw. Samples will be collected from each cut liner using a disposable plastic syringe and will be retained in two sodium bisulfate-preserved volatile organics analysis(VOA)vials in accordance with Environmental Protection Agency(EPA)Method 5035 sampling protocol. The cut liners will then be capped on either end with Teflon tape and plastic caps. The capped liners and VOAs will be labeled for identification and stored in an iced cooler. The soil in the remaining liner sections will be exposed by removing a lengthwise panel of the liner with a splitting tool. The soil column will be visually inspected for discoloration, monitored for odors, and classified in accordance with the Unified Soil Classification System (USCS). Select intervals will be placed in sealable plastic bags and field-screened with a photoionization detector (PID) calibrated to isobutylene. The boreholes will be backfilled with neat cement and capped with asphalt or concrete patch to match existing ground cover,as applicable,upon completion of soil sampling. Laboratory Analyses Partner will collect a total of 24 soil samples, which will be transferred under proper chain-of-custody protocol to Alpha Scientific Corporation (ASC), a state-certified laboratory [California Department of Health Services (DHS) Environmental Laboratory Accreditation Program (FLAP) certificate number 2633] in the City of Cerritos, California, for analysis. Based on field-screening results, one soil sample from each boring (six samples total) will be analyzed for VOCs via EPA Method 8260B and for carbon chain total petroleum hydrocarbons (TPH-cc) via EPA Method 8015M. Additionally, two samples will be analyzed for California Administrative Manual(CAM) 17 Metals via EPA Method 6010B/747IA. Waste Disposal All soil cuttings and decontamination water generated during drilling activities will be stored on-site in properly labeled drums to await proper disposal. Upon receipt of the necessary laboratory analysis results,the waste drums will be properly classified, manifested, and transported to an appropriate facility for disposal. Local Geology and Hydrogeology Based on a review of the United States Geological Survey (USGS), Lodi South, California Quadrangle 7.5 minute series topographic map was reviewed for this ESA. According to the contour lines on the topographic map, the subject property is located at approximately 26 feet above mean sea level (amsl). The contour lines in the area of the subject property indicate the area is sloping gently to the southwest. According to a review of the United States Department of Agriculture's Web Soil Survey for San Joaquin County,the near surface soil association underlying the subject property belongs to the Stockton Urban Land Association. The soils of this association occur on basin floors between elevations from 10 to 40 feet. Stockton soils have clay surface layers about 37 inches thick underlain by a clay loam to a depth of 60 inches. Based on regional topography,the assumed flow direction of groundwater at the subject property is to the southwest. According to the State Water Resources Control Board (SWRCB) GeoTracker website, the nearest Leaking Underground Fuel Tank(LUFT) site with active groundwater monitoring wells is located on the