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E �z. 3330 Data Drive �I �? 0 5 1(39 suite i00 .','Al-HF�,L i y Rancho Cordova,CA 95670 FAX:91&08 Environmental .ENIJlh't-' � �'�f t� J FAX:9t6;ti38.8385 Consultants,Inc. i 1 ;' ' ` February 27, 1992 Mr. Kenneth Earnest Tlttramar Inc. 525 Nest'Third Street Ila.Aord, California 93234 Subject: Quarterly Monitoring Report, Fourth Quarter '1991 Beacon Station No. 695 900 South Cherokee Lane,Lodi,Califaiaia Dela Project No. 44-91-831 Dear Mr. Earnest: Delta Environmental Consultants,Inc. (Delta), has been authorised by Ultramar Inc. (Ultramar),to conduct a hydrogeologic investigation at Beacon Station No.695 located at 900 Sourh Cherokee Lane, San Joaquin County, Lodi, California (F-ores I and 2). 'I1ie purpose of this investigation is to monitor il:e ground water levels and the distribution of petroleum hydrocarbon constituents in the ground water beneath the site. This letter report contains the results of the quarterly ground water monitoring and sampling performed at the site on December 31, 1991. Field work conducted at the ce with the field methods and procedures described in site by Delia was performed in accordan Enclosure A. SUMMARY A total of 23 groundwater monitoring wells are.present at the site. Monitoring wells MW-11 MW-8, MW-16, MW-17, MW-lg; MW-21,MW-24, MW 25, hfNV 27 and recovery well RW-1, contained measurable ground water on December 31, 1991, (fable 1). Ground water was not present in the remaining monitoring wells at the site. .A summary of ground water level measurements recorded zit the site since January 1988 is presented in Enclosure B. around water was present at the site between approximately 66 and 69 feet below the top of casings. Ground water elevation contours based on the December 31, 1991,data indicate an inferred direction i of ground water flow to the east as illustrated in Figure 3. Water levet measurements for monitoring wells MW-1 and MW-17 were not used in constructing the ground water contour map. Monitoring ground water level; probably due to soil venting that is well MW-1 had an anomalously high currently being conducted at the site. The elevated water level within mon'-toring well MW-1 is likely the result of localized vacumm induced soil venting,therefore not affectingthe regions!ground water flow direction beneath the site. Also,monitoring well MW-17 was under pressure when the lucking w ti cap was removed. Gnpund water samples collected on December 31, 1991, from monitoring wells MVV-18,,MW-21, MW-24, MW-27 and RW-1, were submitted to a California-certified laboratory for analysis of i?c;ta fJelr.;irrs Sohiti0t�s