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__ pOR �• i z; 5 7 a L l 5 1S9Z 3 ao 00a D,,v,elfn Suite Enwironmentat "AL HEALTH Rancho Cordova .CA 95670� Const ¢ants,Inc. ( r 91608-2085 FAX:916.638.63F:i February 27, 1992 Mr. Kenneth Ea-rnesi Ultramar I.i!:. 525 West'Third Street Hanford, California 93230 Subject: Quarterly Monitoring Rcport,Fourth Quarter 1991 Beacon Station No.695 900 South Cherokee Lane, Lodi,Califorria Delta Project No. 40-91•-831 Dear MT. Earnest: Delta Environmental Consultants,Inc. (Deltas),has been authorized by Ultramar Inc. Ultramar), to conduct a hydrogeologic investigation at Beacon Station No.695 located at 900 South Cherokee Lane, San Joaquin County, Lodi, California (Figures I and 2). The purpose of this investigation is to monitor the ground water levels and the distribution of petroleum hydrocarbon constituents in the ground water beneath the site. This Ietter 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 site by Delta was performed in accordance with the field methods and procedures described in Enclosure A. SUMMARY A total of 23 ground water monitoring wells are present at the site. Monitoring wells MW-1,MW-8, MW-16, MW-17, MW-18, MW-21, MAV-24, MW-25, MW-27 and recovery well RW-1, contained measurable ground water on December 31, 1991, (Table 1). Ground water was not present in the remaining monitoring wells at the sire. A summary of ground water level measurements recorded at the site since January 1988 is presented in Enclosure B. Ground 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 of ground water flow to the east as illustrated in Figure 3. Water level measurements for monitoring } wells MW-1 and MW-17 were r- t.us.ed_in-constructingthe ground water-contour map.--Monitorin g.well MW-1 had-an anomalously high ground water level; probably due to soil venting that is currently being conducted at the site. 7be elevated water level witUn monitoring weli MINA is likely the result of localized vacumm induced soil venting,therefore not affecting the regional ground water. flow direction beneath the site. Also,monitoring well MW-17 was under pressure wher.the locking i cap was removed. Ground water samples collected on December 31, 1991,from monitoring wells MW-18, MW-21, MW-24, ,'LiW-27 and RW-1, were S."iniued to a California-certified laboratory for analysis of