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4191- PPower inn Road,Sacramento,CA 95826 (916)452-2901 <br /> 14po/1001 GeoSystems • Fremont •Costa Mesa •Sacramento <br /> November 17, 1987 <br /> J'A N 1 I 19'S�3 1117RPHI <br /> AGS Job No. 87048-2 <br /> ENvrROMe!vraL HEALrH <br /> FERMrrj5ERVICE$ <br /> Mr. Robert Phillips <br /> Sharbob, Inc. <br /> 11490 Alpine Road <br /> Stockton, California 95212 <br /> Subject: Analyses of ground-water samples from monitoring wells <br /> at Beacon Station No. 675, 13975 Highway 88, Lockeford, <br /> California <br /> Mr. Phillips: <br /> At your request, Applied GeoSystems personnel were present at the <br /> above-referenced site on October 7, 1987 to collect ground-water <br /> samples from the four monitoring wells on site. The samples were <br /> analyzed at Applied GeoSystems' laboratory in Fremont, California <br /> for total volatile hydrocarbons and the volatile hydrocarbon <br /> constituents benzene, ethylbenzene, toluene, and total xylene <br /> isomers by Environmental Protection Agency Method 8020. These <br /> analyses were requested to allow more efficient evaluation of <br /> subsurface conditions at the site. The site location is shown on <br /> the Site Vicinity Map, Plate P-1, and the configuration of the <br /> monitoring wells with respect to station facilities is shown on <br /> the Generalized Site Plan, Plate P-2 . <br /> The Applied GeoSystems geologist made an initial water-level <br /> measurement using a Solinst electronic water-level indicator. A <br /> bailer cleaned with detergent and deionized water was then <br /> lowered halfway through the air/water interface to obtain a <br /> sample from the water surface. This sample was inspected for <br /> subjective evidence of hydrocarbon contamination. No floating <br /> product, sheen, or hydrocarbon odor was detected. Each well was <br /> then purged of approximately three well volumes using a <br /> submersible air-lift pump. After the well recovered to near <br /> static conditions, a ground-water sample was collected by <br /> lowering the bailer to a point 7 to 10 feet below the ground- <br /> water surface. The water was then slowly transferred to two <br /> laboratory-cleaned 40 milliliter, glass volatile organic analysis <br /> vials, and the vials were sealed with Teflon-lined caps. Three <br /> to four drops of concentrated hydrochloric acid were added as a <br /> preservative. The sample vials were then labeled and placed in <br />