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W� itDeBoer Truck Lines, Inc. 201 West Sth Street, Ripon, California Phase I Report of Findings September.9, 199„A � Page: ;4 Soil samples collected for analysis were analyzed using EPA method 3550ALUFT for 11 diesel range petroleum hydrocarbons and EPA method 8020 for BTX&E compounds. �- The minimum detection limits used for each analyte were .005 mg/kg for BTX&E anti 5.0 mg/kg for diesel. Analyses were conducted by GeoAnalytical Laboratories r Inc. a State-certified lab in Modesto, California. ' U ii 3.5 Groundwater Sampling A travel blank provided by the laboratory accompanied the sample vials from the time they are picked up from the lab to the time they are delivered to the lab. This travel' blank was listed on the Chain of Custody but will be analyzed only if all samples; contain the same contaminants. ,i A11 sampling-equipment including the pump, bailer, and cables, used by sampling;; personneI, were disassembled, if appropriate, and steam-cleaned prior to commencement of sampling. These procedures were also followed between each well,? sampling point, and at the end of the sampling day. De-ionized or organic-free water p (also provided by the laboratory)was then introduced into the pump or bailer as a final stage of cleaning. This water was then pumped or gently poured into sample vials to!, be used as pump or bailer blanks. These blanks were tested only iftheir corresponding " -' samples were found to contain contaminants. u Immediately prior to sampling, water levels and well depth measurements were !; recorded in all wells at the site. Each well was evacuated using either a stainless steel bladder pump, which does not introduce air into the water column, or a;Teflon bailer. The pI-L temperature, and electrical conductivity of the water was monitored with instruments calibrated to known standards as the wells were evacuated. These parameters are noted on field logs (Table 4, Appendix D). At least 5 well volumes II were evacuated from each well, or more, as necessary, until the above parameters had stabilized. The wells, or other sampling points, were sampled in order of the least to the most contaminated, as best known or estimated. The samples were pumped from a !� stainless steel bladder pump or carefully poured from a Teflon bailer into clean glass vials with-Teflon-lined screw caps and half gallon plastic containers provided by the laboratory. Care was taken to ensure that no air space exists 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 and method 3510 for diesel range hydrocarbons. The minimum detection limits used for each analyte were 0.5 pg/kg for BTX&E and 0.5 mg/kg for diesel. Analysis were conducted by GeoAnalyticai Laboratories, Inc., a State-certified lab in Modesto, California. 4 ' ii