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JVM ASSOCIATES <br />• WKA No 1735 02 <br /> July 16, 1993 <br /> Page 2 <br /> temperature, pH, and conductivity readings stabilized and/or the water cleared of sediment The <br /> water samples were then collected using a new polyethylene disposable bailer Water from the <br /> disposable bailer was decanted into appropriate sample containers provided by the laboratory <br /> The samples were immediately placed in an ice-chest with ice and submitted under chain-of- <br /> custody to a California-certified laboratory for analysis of Total Petroleum Hydrocarbons (TPH) <br /> using EPA method 8015, and Benzene, Toluene, Ethylbenzene and Total Xylenes (BTEX) using <br /> EPA method 602 <br /> The 3 1/2-inch diameter PVC bailer was cleaned prior to purging each well with a solution of <br /> trisodium phosphate and distilled water to minimize the potential for cross-contamination All <br /> water removed during sampling and purging operations was placed in sealed and labeled 55- <br /> gallon drums and stored on site <br /> No free product was observed in monitoring wells MW1 through MW3 Laboratory analytical <br /> results for water samples obtained from MW1 revealed a TPH-gasoline concentration of 53 µgIf <br /> However, Mr Joel Kiff, Senior Chemist at Western Environmental Science & Technology, <br /> indicated that this is not typical gasoline possibly due to the diesel interference in the <br /> chromatograph TPH as diesel and motor oil was detected in sample MW 1 at concentrations of <br /> 1100 µg/f and 460 µg/e, respectively Mr Kiff also indicated that a replicate of MW1 was <br /> analyzed as part of the laboratory's quality control Analytical results of this replicate sample, <br /> MW1-REP, revealed a TPH-diesel concentration of 810 µg/f and a TPH-motor oil concentration <br /> of 480 ug/f <br /> Analytical results for MW2 and MW3 revealed no detectable concentrations of TPH as gasoline <br /> or BTEX However, TPH diesel was detected at concentrations of 72 Ag/f and 87 gglf in MW2 <br /> and MW3, respectively TPH-motor oil was also detected in MW2 and MW3 at concentrations <br /> of 280 µgIf and 380 µg1f, respectively Laboratory analysis results for ground water samples <br /> obtained from the three on-site monitoring wells are summarized in Table 1 <br /> ID <br /> WALLACE XURL <br /> Recy,kdPQIWT &ASSQCIAVES[KC <br />