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4(9p�g_ <br /> Geological Audit Services, Inca EtIr t #TAL HEALTH <br /> -- Environmental Professionals ;t SERVICE{}VC[ <br /> Vbmw <br /> EW 1803W.March Lane,Suite A•Stockton.CA 95207-(209)956-0264 11; 22 <br /> November 17, 1994 <br /> SC-94-11-1047-02 <br /> Ms. Margaret Lagorio <br /> San Joaquin County PHS/EHD <br /> P.O. Box 388 <br /> Stockton, CA 95201 <br /> Subject: Soil Sample Collection <br /> Calkins Trucking <br /> 19501 North Highway 99, Acampo, California <br /> Dear Ms. Lagorio: <br /> On November 3, 1994, representatives of Geological Audit Services, Inc. (GeoAudit) <br /> collected three soil samples from the floor of the excavation at 19501 North Highway 99 in <br /> Acampo, California(the site). The soil samples were collected to determine if impacted soil <br /> was present in the excavation. <br /> Each sample was collected using a metric soil sampler pre-loaded with two clean 2 by 2-inch <br /> brass sleeves. The ends of the lead sleeve were then covered with aluminum sheets, capped <br /> and sealed with tape. The samples were transported under chain-of-custody to McCampbell <br /> Analytical, Inc. in Pacheco, California. Each sample was analyzed for total petroleum <br /> hydrocarbons (TPH as diesel) in accordance with EPA method 8030/8015m. Sample <br /> collection was witnessed by the San Joaquin County Public Health Services - EnvironmentaI <br /> Health Division (PHS/EHD). The laboratory report and chain-of-custody are attached. <br /> No TPH as diesel was detected in samples LC-S or LC-N, collected from the south and <br /> north ends of the excavation. However, TPH as diesel was detected in sample LC-W (west <br /> end of the excavation) at a concentration of 4,800 mg/kg (ppm). All samples were collected <br /> from depths between 25.5 feet and 27.5 feet below surface grade (bsg). <br /> It is our understanding that a soil boring was drilled near the center of the excavation. <br /> Samples collected from the boring indicated that no petroleum hydrocarbons were present <br /> at a depth of 35 feet. The excavation is presently approximately 25 feet in depth. Since <br /> hydrocarbons were only detected in one soil sample from the western portion of the <br /> excavation,we propose to excavate remaining impacted soil from the floor of the excavation. <br /> G IGRimt Mdd Suomi I.. 1 <br /> SC-91.11-10414MCALMM=SS <br /> Full Spectrum e=nvironmental Services• Hydrogeoiogy <br />