Laserfiche WebLink
v <br /> awron <br /> NVR, T4 S��TA L A,_T11 Chevron <br /> �.iY} S iJ `�: f <br /> PC(� i i :. VI1, <br /> 93 OCT - ! PM 2: 05 <br /> Chevron U.S.A.Products Company <br /> 2410 Camino Ramon <br /> September 29, 1993 San Ramon,CA 94583 <br /> Marketing Department <br /> Phone 510 842 9500 <br /> Ms. Mary Meays <br /> San Joaquin County Environmental Health Department <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Former Chevron Station #9-7780 3246 East Fremont Street Stockton CA 95205 <br /> Attached Environmental Assessment Report(GTI, 9116193) <br /> Dear Ms. Meays: <br /> Please find attached an environmental assessment report dated, September 16, 1993, which was <br /> prepared by Chevron's consultant, Groundwater Technology, Inc. (GTI), to describe the <br /> installation and sampling of two groundwater monitoring wells at the subject site on May 3, 1993. <br /> The attached report also describes procedures and results of soil sampling performed beneath <br /> former product piping that was discovered during exploratory trenching. <br /> All soil samples collected during the site assessment work were analyzed for the presence of <br /> TPHGas and BTEX constituents. Soil samples collected from soil boring/monitoring well 13- <br /> 5MW-5 and from beneath the former product piping were below the method detection limits for <br /> TPHGas and BTEX. Soil samples collected from soil boring/monitoring well B-4/MW-4 detected <br /> TPHGas (130 ppm) at fifteen feet below grade only. Trace levels (¢ 0.05 ppm) of BTEX were <br /> detected to thirty five feet below grade. <br /> Site monitoring wells MW-4, MW-5, and EA-6 were sampled and analyzed for TPHGas and <br /> BTEX. Groundwater samples from these wells were all below the method detection limits for these <br /> constituents. Monitoring wells EA4 and EA-5 could not be located. Monitoring wells EA-1, EA- <br /> 2, and EA-3 were all dry. <br /> The soil analytical data acquired during this site assessment work confirms that the source of <br /> contamination on site was limited to the former fuel tank area. The vertical and lateral extent of <br /> TPHGas in the soil has been defined at fifteen feet below grade at the MW-4 location. The trace <br /> levels of ethylbenzene and xylene present to thirty five feet below grade at MW-4 do not represent a <br /> continual source of groundwater contamination. <br /> The absence of any detectable TPHGas and BTEX below thirty five feet in MW-4, MW-5, EA-6, <br /> and SB-1 demonstrates that no residual hydrocarbons remain in shallow soils as a result of <br /> groundwater levels dropping nearly thirty feet since 1988. <br /> These latest data obtained by GTI have demonstrated that there are no continual sources of <br /> groundwater contamination remaining beneath the subject site and there continues to be no <br /> l��f <br />