ARCHIVED REPORTS - GROUNDWATER MONITORING WELL INSTALLATION AND LIMITED SOIL SAMPLING

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' KLEINFELDER ' • Gasoline oxygenates and additives; • Volatile and Semivolatile Organic; • Cam 17 suite of Metals; • Poly Aromatic Hydrocarbons; • Poly Nuclear Aromatics; ' • Poly Chlorinated Biphenyls. Groundwater on site is located at approximately 26 feet below ground surface (bgs). WHF, Inc., Environmental Engineering Group (WHF) of Oakdale, California previously conducted a Phase H Site Assessment for the site dated March 16, 2001 for the Elks Lodge Property located at 317 South Center Street, Stockton, California. WHF completed a boring to determine groundwater ' depth and soil and groundwater contamination (metals and hydrocarbons) on site. The following conclusions were made by WHF: ' 0 The groundwater contains MTBE and gasoline above the acceptable limits. • Motor oil was present in groundwater at 23 mg/L; • The soil column at B-1 from 10"to 25' was free from contamination for those parameters ' analyzed except for the priority metals; • The priority metals are all below the maximum acceptable limits for both the groundwater and soil; • Groundwater was encountered at 26'below ground level; • There was an auto wrecking yard, ACME Auto Wrecking located at 325 South Center from 1949 to 1955. In 1955 to 1956 the business on this property became ACME Auto and Truck Parts. After 1956 the business no longer existed. In 1960 the site was cleared; ' 0 Oxygenates, including MTBE, were not used prior to 1975, therefore, it is logical to assume that the gasoline and MTBE contamination present in the groundwater underlying the site is from an off-site source since this site was cleared 15 years prior to the ' introduction of oxygenates into gasoline; • There is no published standard for Motor Oil in groundwater and is reviewed on a site specific basis as to impact. ' WHF, Inc. also conducted a Site Characterization Report of Findings dated August 9, 2001 for the site. WHF collected ten soil samples at three different depths (composited) to evaluate the lead ' concentration in soils. The following conclusions and Recommendations were made by WHF. • Based on preliminary data developed during this scope of work it is evident that ' significant lead contamination is present in the soils on-site. Due to such high levels of lead the soils are classified as a Class I Hazardous Waste and must be disposed of at a Class I Hazardous Waste Disposal Facility. WHF has estimated the contaminated soil mass to be approximately 1,700 cubic yards. ' Kleinfelder prepared a proposal/workplan dated July 3, 2003 for First Service of Northern California. That proposal/workplan was later revised on March 30, 2004. The proposed scope of ' work was implemented, and the results of that investigation are detailed in this report. ' 42162.E01 /ST04R854 Page 8 of 22 ' Copyright 2004,Kleinfelder,Inc. July 1,2004