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Ms. Nancy Vukelich <br /> February 26, 1991 <br /> Page 2 <br /> Water purged from the well points prior to sampling and rinsate from the steam cleaning of the soil <br /> sampling core barrels was contained in a 55-gallon steel drum. This drum was labeled and is currently <br /> retained on site. All cuttings generated during soil coring were placed in another drum, which is also on <br /> site. Both drums will be held until appropriate disposal can be arranged. <br /> All soil and water samples were transported under Chain-of-Custody Manifest to Clayton Laboratories, a <br /> State of California-certified facility in Pleasanton, California, for laboratory analyses. Soil samples from <br /> approximately 2-feet below grade were analyzed for polychlorinated biphenyls (PCB) and organochlorine <br /> pesticides (OP) by U.S. Environmental Protection Agency (EPA) Method 8080. Soils collected from just <br /> above the zone of saturation in each sampling hole were analyzed for benzene, toluene, ethylbenzene, <br /> and xylenes (BTE)O, and for total petroleum hydrocarbons (TPH)-as-gasoline using EPA Methods <br /> 8015/8020. Water samples were analyzed for PCBs, Ops, BTEC, and TPH-as-gasoline using the same <br /> EPA Methods. <br /> Sample analyses indicated no detectable concentrations of BTEC, TPH-as-gasoline, or PCBs in the soil <br /> or groundwater beneath this site. Analytical results reported that the water sample from PC-1 contained <br /> 0.08 parts per billion (ppb) Endosulfan sulfate and the water from PC-4 contained 0.03 ppb of the same <br /> compound. Except for PC-5, all the 2-foot deep soil samples contained detectable concentrations of 4,4 <br /> DDE. Four of the samples also contained 4,4 DDT. The concentrations of 4,4 DDE ranged as high as <br /> 64 ppb, and the concentrations of 4,4 DDT as high as 42 ppb. A copy of the analytical report is <br /> attached. <br /> Endosulfan sulfate, 4,4 DDE, and 4,4 DDT are all pesticides. The levels encountered are low and most <br /> likely reflect residual concentrations left in the soil from agricultural use of the subject site. None of <br /> these compounds are regulated on the Federal or State Department of Health Services level. Based on <br /> these considerations, these levels of pesticide residues are unlikely to prevent the development of this <br /> site as a gasoline service station. <br /> If you have any questions regarding the contents of this letter report, please contact our Concord office <br /> at (415) 671-2387. <br /> Sincerely, <br /> GROUNDWATER TECHNOLOGY, INC. <br /> L. Mitchell ED GFG, <br /> Proj�,Mt roge st e�\�P�EN B.STpy� <br /> Al �. Std i Exp. <br /> No 4394 <br /> Registered Geo ist <br /> No. 4394 <br /> GLM:ABS:lf TF OF CAt- 0 <br /> Enclosures <br /> LR3327A.GLM } <br /> GROIJNDWAXI'X <br /> f�L-7f_ i TECHNOL <br />