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f Canepa's Car Wash 6230 Pacific Avenue, Stockton, California April 29, 1994 Phase 11 Site Characterization Page: S introduced. into the Bader as a final stage of cleaning This water was then gently poured into sample vials to be used as bailer blanks These bailer blanks were not tested unless their corresponding samples contained contaminants EImmediately prior to sampling, water levels and well depth measurements were taken to all wells at the site Each was evacuated using a stainless steel bladder pump which does not introduce air into the water column The pH, temperature and electrical conductivity of the water were monitored as the well was evacuated These parameters are noted on the Field bogs (Appendix G) Instruments calibrated to known standards were used to monitor these parameters At least five (5) well volumes were evacuated from each well, and more, if necessary, until the above parameters were stabilized The samples were carefiAly poured from a Teflon bailer into half gallon plastic containers and clean glass vials with Teflon-lined screw caps provided by the laboratory Care was taken to ensure that no air -,pane existed in the vials by inverting to check for bubbles and re-sampling if necessary The samples were analyzed or extracted within 14 days according to their EPA methods Water samples collected for analysis were analyzed by EPA method 602 for BTX&E compounds, method 3550 for gasoline range hydrocarbons and on the first four wells, method 601 for 1,1,1, tnchloroe&.ane, because this compound was found in the soil spoils pile test sequence Following the initial sampling,PHS/EM will evaluate the need to continue the volatile organic compound analysts. All analyses were conducted by Geo-Monitor, Inc, a State certified laboratory 4.0 Soil Conditions E The Soil Survey completed in 1988 by the U S Department of Agriculture, Soil Conservation E Service, generally classify the sod types as being Jacktone, Hollenbeck or Stockton types Generally, these sods are somewhat poorly to moderately well-drained, fine texture soils that are moderately deep to deep, down to a cemented hardpan Analysis of soil samples show boring B-1 to be contaminated from 35 feet down to the water table at approximately 55 feet below ground level MW-1 is only 8 feet from bonng B-1 and was not laboratory sampled Two tntervals of le-m.than 100 ppm were detected in MW-2 with a portable PID MW-3 was ND ("none-detected") for BTEX, Gasoline and TCE, but had traces of chloroform in the samples at 50 and 55 feet(Table 5) MW-3, 4, 5 and 8 were ND Both MW-6&7 had contamination at 50 and 55 feet,the capillary fringe and water table at the time of drdhng The soil corttaiwanon plan map shows depths m feet below ground level to the top of the plume(Figure 10) E