Laserfiche WebLink
Analytical Results <br /> Eight samples were submitted to Superior from the first round of samples on September 17, <br /> 1992, and six samples were submitted from the second round on October 23, 1992. Superior <br /> is certified by the State of California Department of Toxic Substances Control (DTSC) for the <br /> requested analyses. The first round of samples were analyzed for: <br /> Total purgeable petroleum hydrocarbons (TPH-gasoline); <br /> ► Benzene, toluene, ethylbenzene and xylenes (BTEX); <br /> ► Ethylene dibromide (EDB); <br /> ► Total lead. <br /> The second set of samples were analyzed for: <br /> TPH-gasoline; <br /> ► BTEX; <br /> ► Total lead. <br /> Each set of samples was analyzed on a standard laboratory turnaround schedule requiring <br /> approximately five working days for the receipt of data. <br /> Benzene, ethylbenzene, gasoline, and EDB were not detected in any of the first round samples. <br /> Toluene was detected 1n Sample Nos. 74123 and 74128 at 4 and 3 ug/kg, respectively. <br /> Xylenes were detected in Sample No. 74122, 74123, 74126, and 74128 at 15, 14, 13, and 9 <br /> ug/kg, respectively. Lead was detected above the reporting limit in all but one of the samples <br /> (74127). However, only Sample No. 74128 contained lead at a concentration which <br /> Kleinfelder would consider slightly elevated (22 mg/kg). Due to San Joaquin County's <br /> interpretation of their contract with the State of California, these results are considered by San <br /> Joaquin County to be qualitative because a County representative was not present to direct the <br /> sample collection. <br /> In the second set of samples, lead was reported at the detection limit of 5 mg/kg in Sample <br /> Nos. 74153 and 74155, and xylenes were reported in Sample No. 74155 at 9 ug/kg. The <br /> remaining BTEX constituents, TPH-gasoline, and lead were not detected in the second round <br /> samples. <br /> The analytical data is summarized on the attached table, the chain-of-custodies, and the <br /> analytical laboratory reports are attached. <br /> Conclusions <br /> Fourteen samples were collected during two sampling rounds. With the exception of the lead <br /> concentrations reported in Sample No. 74128, concentrations were either non-detect <br /> (gasoline), non-detect to just above detection limits (BTEX), or background (lead). Sample <br /> No. 74156 was collected at approximately the same location as Sample No. 74128 but did not <br /> contain detectable concentrations of lead. The slightly elevated lead concentrations reported in <br /> Sample No. 75128 may be the result of a variety of naturally occurring or roan induced <br /> factors; however, based on the second sample (No. 74156) results, further work to explore <br /> these possibilities does not appear warranted. <br /> Based on the reported results, Kleinfelder requests closure of the site so that the stockpiled soil <br /> may be sent to Forward for bioremediation, and the excavation and remaining trenches may be <br /> backfilled. <br /> FR8-92-219 Page 2 of 3 24-220165-D00 <br /> Copyright 1992 Kleinfelder, Inc. <br /> KLEINFELDER 3077 Fite Circle, Sacramento, CA 95827 (916) 366-1701 <br />