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I< MAY 2 2 'M ENVIRONMEIN Tref JIFF 3330 Data Drive + 1 H Suite 100 Delta PCERM!T/,,L., +r Rancho Cordova CA 95670 Envcronntenta! 9161638 2085 Consultants,Inc FAX 9161638 8385 May 5, 1992 Mr. Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 1 Subject Quarterly Monitoring Report, First Quarter 1992 Beacon Station No 695 900 South Cherokee Lane, Lodi, California Delta Project No 40-91-831 Dear Mr Earnest Delta Environmental Consultants, Inc (Delta), has been authorized by Ultramar Inc (Ultramar) to conduct a hydrogeologlc investigation at Beacon Station No 695 located at 900 South Cherokee Lane, San Joaquin County, Lodi, California (Figures 1 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 letter report contains the results of the quarterly ground water monitoring and sampling performed at the site on March 4, 1992 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-20, MW-21, MW-22, MW-23, MW-24, MW-25, MW-27 and recovery well RW-1, contained measurable ground water on March 4, 1992 Ground water was not present in the other wells at the site The depth to ground water was approximately 65 to 67 5 feet below the top of the well casings Ground water levels in the monitoring wells have Increased approximately 1 5 feet since the previous monitoring event in December 1991 A summary of ground water levels recorded at the site since June 1991 is Included In Table 1 Enclosure B contains ground water level data since January 1988 Ground water elevation contours based on the March 4, 1992, data Indicate an inferred direction of ground water flow to the south-southeast, as Illustrated in Figure 3 The hydraulic gradient across the site was approximately 0 004 The Inferred ground water flow direction and hydraulic gradient are consistent with previous data Water level measurements for monitoring wells MW-8 and MW-22 were not used In constructing the ground water contour map Monitoring well MW-8 contained 0.06 foot free product and monitoring well MW-22 had an anomalously high ground water level The total depth of monitoring well MW-22 Is approximately 59 feet below grade, therefore, the water level measured In this well Is not considered representative of conditions at the site Delta Delivers Solutions