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(Y <br /> �i <br /> 4191-E Power Inn Road,6a(-amento,CA 95826 1916)452-2901 <br /> P `REMONT a IRVINE n HOUSTON o BOSTON •SACRAMENTO •CULVER CITY •SANJOSE <br /> — �; -- <br /> january 8, 1990 <br /> 1121gdem <br /> AGS 86102-4 <br /> j iVir. C-!-nn Dembruff <br /> UltramarInc. <br /> 525 Jest Third Street <br /> Hartford, California 93230 <br /> subject: l ettar u cP^r* on quarterly r�=� 4 5 groundwater monii,9r;P:n. third quarter 1989, at <br /> Beacon Station No. 492, 470 North Main Street, Manteca, California. <br /> Mr. Dembroff: <br /> At the request of Ultramar (formerly Beacon Oil Company), we are presenting this Ietter <br /> report summarizing the methods and results of the quarterly groundwater monitoring <br /> performed by Applied GeoSystems at the subject site. The site is at the southeast corner <br /> of North Main and Alameda Streets, as shown on the Site Vicinity Map (Plate P-1). The <br /> locations of the ground-water monitoring wells relative to site facilities are depicted on the <br /> Generalized Site PIan (Plate P-2). Previous work at the site by Applied GeoSystems is <br /> e� documented in the reports cited in the attached references!ist. <br /> 4 <br /> A geologist from Applied GeoSystems visited the site on October 11, 1989,and October 18, <br /> 1989, to collect ground-water samples from the three monitoring wells for laboratory <br /> analysis. The depth to the ground-water surface was measured, and water from each <br /> '.� monitoring well was analyzed subjectively by methods outlined in the attached Field <br /> Procedures. The geologist noted no subjective evidence of hydrocarbon product. Results <br /> of these and previous subjective analyses are summarized in Table 1. <br /> Ground water from each monitoring well was purged and sampled as outlined in the Field <br /> Procedures. The field geologist initiated a Chain of Custody Record that accompanied the <br /> samples to the analytical laboratory. A copy of that record is attached. The purge water <br /> from the wells was stored temporarily onsite in properly labeled,5S-gallon,17-E steel drums <br /> 'approved for that use by the Department of Transportation,pending removal by Ultramar. <br />