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v <br /> OWN <br />`v. <br /> 401*d G'eoSYSMOMZ" 4191•E Power Inn Road, Sacramento,CA 95826 (916)452.29o1 <br /> FREMONT * IRVINE a HC' ,TON • BOSTON s SACRAMENTO a CULVER CITY a SAN JOSE <br /> October 19, 1989 <br /> 0823gdem <br /> AGS 86102-4 <br /> Mr. Glenn Dembroff <br /> Ultramar, lne, <br /> 525 gest Third Street <br /> Hanford, California 93230 <br /> Subject: Letter report on quarterly groundwater monitoring at Beacon Station No, <br /> 492, 470 North Main Street, Manteca, California. <br /> Mr. Dernbroff: <br /> At the request of Ultramar Inc. (Ultramar, formerly Beacon Oil Company), we are <br /> presenting this letter report summarizing the methods and results of the quarterly ground- <br /> water monitoring performed.by Applied GeoSystems at the subject site. The site is at the <br /> southeast corner of North Main and Alameda Streets as depicted on the Site Vicinity Map <br /> (Plate P-1). The approximate configuration of the station facilities, including three <br /> underground product-storage tanks, is depicted on the Generalized Site Plan (Plate P-2). <br /> Previous work at the site by Applied GeoSystems is documented in the reports cited in the <br /> 0. References. <br /> A geob ist from Applied GeoSystems visited the site on July 20, 1989, to collect ground- <br /> water s:-,i-nples from the three monitoring wells for laboratory g analysis. The depth to the <br /> ground-Mer surface was measured and water from each monitoring well was subjectively <br /> analyzed by methods outlined in the attached Field Procedures. The geologist noted no <br /> subjective evidence of hydrocarbon contamination in samples from wells MSV-2 and MW- <br /> 3; a slight sheen was noted on the sample frim MW-1. Results of these and previous <br /> subjective analyses are summarized in Table 1. <br /> Ground wafer from each monitoring well was purged and sampled as outlined in the Field <br /> Procedures. The purge water from the wells was temporarily stored onsite in properly <br /> labeled, 55-galIon, 17-E steel drums, approved for that. use by the Department of <br /> Transportation, pending removal by Ultrarlar. The field geologist initiated a Chain of <br /> ----- ---Custody-Record-that accompanied the-samples tc-the analytical laboratory.- A copy of <br /> record is attached. <br /> NEWII <br />