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� '�i �..�a..s max, 3a.: .-ey' '�,: �...—.—_ Y•".. � - _ _. u �� �'r _, <br /> 15 <br /> s <br /> 3330 Data Drive <br /> to Suite 100 <br /> Environmontal Rancho Cordova,CA 95670 <br /> P. Consultants,lnc. 915.+638.2085 <br /> FAX:916,638.8385 <br /> RKU1 <br /> FEB 2 6 ISU <br /> ENVIRONMEN FAl_ HEALTH <br /> PERMIT/SERVICES <br /> February 6, 1992 <br /> Ms.Marla Guensler <br /> Marketing Division <br /> Exxon Company U.S.A. <br /> 2300 Clayton Road, Suite 1250 <br /> Concord, California 94520 <br /> Subject: Quarterly Monitoring Report, Fourth Quarter of 1991 <br /> Exxon Station RIS No. 7-3708 <br /> 2705 Country Club Boulevard,Stockton,California <br /> Delta Project No. 40-91-838 <br /> Dear Ms. Guensler: <br /> Delta Environmental Consultants, Inc. (Delta),has been authorized by Exxon Company U.S.A. <br /> (Exxon), to conduct quarterly monitoring at the:Exxon service station located at 2705 Country Club <br /> Boulevard, Stockton,California (Figure 1). This letter report contains the latest quarterly ground <br /> water analytical results and water level data for this site. Ground water samples and water level <br /> measurements were collected from three on-site monitoring wells (MW-I, MW-2, and MW-3)on <br /> December 13, 1991. Monitoring wells and facility locations are illustrated in Figure 2. All field <br /> activities were conducted using procedures described in Enclosure A. <br /> Ground water levels measured in the monitoring wells MW-1, MW-2,. and MW-3 since <br /> August 23, 1991,are compiled in Table 1. Depth to ground water measured on December 13, 1991, <br /> ranged from 15.40 to 16.81 feet below grade. The elevations of the monitoring wells were surveyed <br /> using a California Department of Transportation bench mark(No. 1618L)which has an elevation of <br /> 0.728-feet above mean sea level. Between August 29 and December 13, 1991, the ground water <br /> elevations decreased--0.12-to..0.1.7-foot-in-monitoring-wells-MW-I-through-MW-3,--Ground-water ---- -------- -- <br /> leve'-measurements collected on December 13, 1991,indicate the direction of ground water flaw <br /> across the site.is to the northeast:with a gradient of approximately 0.001 (Figure 3). <br /> [ <br /> Delta Delivers Solutions <br /> r�ir1 <br />