Laserfiche WebLink
Canepa's Car Wash <br /> 6230 Pacific Avenue, Stockton, California December 30, 1993 <br /> Interim Status Report, Phase II Investigation Page: S <br /> method 602 for BTX&E compounds, method 3550 for gasoline range <br /> hydrocarbons and method 601 for 1,I,1, trichloroethane because this compound <br /> was found in the soil spoils pile test sequence Following the initial sampling, <br />' PHS/EHD will evaluate the need to continue the volatile organic compound <br /> analysis. All analyses were conducted by Geo-Monitor, Inc , a State certified <br /> laboratory <br /> 4.0 Soil Conditions <br /> The Soil Surveycompleted p in 1988 by the U S Department of Agriculture, Soil <br /> Conservation Service, generally classify the soil types as being Jacktone, Hollenbeck or <br />' Stockton types Generally, these soils are somewhat poorly to moderately well-drained, <br /> fine texture soils that are moderately deep to deep, down to a cemented hardpan <br /> Analysis of soil samples show boring B-1 to be contaminated from 35 feet down to the <br /> water table at approximately 55 feet below ground level MW-1 is only 8 feet from B-1 <br /> and was not laboratory sampled Two intervals of less than 100 ppm were detected in <br /> MW-2 with a portable PID MW-3 was "none-detected" for BTEX, Gasoline and TCE, <br /> but had traces of chloroform in the samples at 50 and 55 feet (Table 5) <br /> 5 0 Groundwater Conditions <br /> The water table was approximately 53 to 55 feet below ground level as the borings were <br /> tieing drilled Subsequent water sampling of all monitoring wells recorded water levels as <br /> shown in Table 1 & Appendix G <br /> Analyses of groundwater samples from the monitoring wells show benzene, toluene, <br />' xylene and gasoline contamination in MW-1, 2 and 4 MW-3 only had gasoline (Table 7) <br /> The groundwater measurements from the in-tial sampling event of November 1, 1993 were <br /> used to construct the gradient map shown as Figure 8 The groundwater contours <br /> indicate a trough dipping due North and averaging 0 009 ft/ft The wells were measured <br /> again on December 7, 1993 and another gradient map was constructed as Figure 9 The <br /> gradient directinn had d moved 60 derâ–ºrPAc o +i,- s..n. A w-A flattened . <br /> b...... t.. ai <br />