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I • ' Beacon Cardlock Station Number 610 SSB 92-1001-01 3300 Waterloo Road Page 2 Stockton, California 2.2 Project History A preliminary subsurface environmental investigation was conducted by Applied Geos stems in PP Y March and April of 1987 Four approximately 65 foot monitoring wells were constructed cross and down-gradient from an underground gasoline storage tank cluster Two 12 foot soil borings were drilled immediately adjacent to the tank cluster Locations of the monitoring wells, soil borings, and fuel tank cluster are presented on Plate 2 ILaboratory analysis indicated the presence of low level hydrocarbon concentrations in the soil of each monitoring well boring and the ground water in each monitoring well Increased hydrocarbon f concentrations were detected in the soil of the two 12 foot soil borings The results of these laboratory analyses are presented in Table 1 TABLE 1 RESULTS OF LABORATORY ANALYSES OF CONTAMINATED SOIL AND GROUND-WATER SAMPLES Beacon Cardlock Station Number 610 3300 Waterloo Road ' Stockton, California Sample Number Date Sampled B T E X THCV THCE i Soil Samples S-40-31 3/10/87 ND 013 ND Oil 035 ND S-40-132 3/11/87 ND 013 ND ND 039 ND IS-40-B3 3/11/87 ND 013 ND 010 035 ND S-12-114 3/16/87 ND 008 ND 035 1075 42 S-12-B5 3/16/87 ND 010 ND 047 149 ND S-35-B6 4/10/87 ND ND ND ND 040 ND Water Samples W-45-MW1 4/13/87 ND ND ND ND 00022 ND W-45-MW2 4/13/87 ND 00024 ND 00007 00171 ND W-45-MW3 4/13/87 ND 00007 ND 00016 00083 ND W-45-MW4 4/13/87 00012 00051 ND 00016 00599 ND LT alues listed are in milligrams per kilogram (parts per million) Benzene, T = Toluene, E = Ethylbenzene, X = Xylenes, ND = None Detected HCV = Total Volatile Hydrocarbons, THCE = Total Extractable Hydrocarbons SSB ENVIRONMENTAL CONSULTANTS, INC