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e KLtINIELDER ENT,CUrIVE SUNINIARY CH3 Construction acting as an agent for Santa Fe Pacific Realty Company,inundhe ropery owner, contracted with Kleinfelder. Inc., to further evaluate soil and g conditions at the site where a 2000-gallon fuel storater ge tank had been removed at 1515 west Weber Avenue in Stockton, California. Petroleum hydrocarbons were detected in soil and ground water samples collected from the tank excavation by FGL Environmental, a previous consultant. at the site, einfelder To further evaluate soil and ground watt cd ons subtmitted one sampleefrom each boring for s an soil-gas survey-, drilled three soil boring measured chemical analysis; installed, developed, and samltheed tdirect tionhree of grounditoring The the depth to ground water in the wells to locateles collected. soil-gas survey detected petroleum hydrocarbon constituents in six of 15 same in the h Petroleum hydrocarbons were not detected ip analysis, from B-3. Petroleum hydrocarbons with the exception of 5.5 ug/1 toluene in the p s. were not detected in each of the samples�il Sam lected r at 1600 1600 the three monitoring most probable Humbler However, coliform was detected in the M p (MPN)/100 mi -- possibly due to MW-1's proximity to a sewer line. Measured ground f water elevations ranged from 83.43 to 85.03 feet, and the ground water gradient and direction at the time of the sampling was 1.15 percent to the southwest. lleinfelder's conclusions and recommendations are based on these findings. ,ne results of the soil-gas survey and soil assessment indicate that soil and ground water adjacent to the excavation are affected by petroleum hydrocarbons. Kleinfelder recommends quarterly monitoring of the ground water quality and gradient to assess the I effects of seasonal variations and to assess the possibility afc o soil,grthe(hallow f water spreading laterally as well as downgradtent due to permeability ground water gradient, and gradient fluctuations due to tides and/or seasonal changes. Kleinfelder recommends that affected soil and ground water around the excavation be remediated. Soil remediation options that include the treatment of ground water should be considered because of the-shallow-nature of tie ground water - This executive summary is subject to limitations stated in this report. Fu_90.tot t Copyright 1990 Kteinfewer, Inc.