ARCHIVED REPORTS_XR0007502 CASE 1

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� •tri`. D�� 3330 Data Drive Suit�a Ran 108 Rancho Cordova GA 95670 . En��ronmentai 9161638-2885 Consultants,Inc FAX 9161638 8385 December 13, 1993 Mr Wade Broughton General Mills Post Office Box 3002 Lodi, California 95241-1906 Subject Quarterly Monitoring Report, Third Quarter 1993 General Mills Facility 2000 West Turner Road Lodi, California Delta Project No 40-92-708 Dear Mr Broughton Delta Environmental Consultants, Inc (Delta), has been authorized by General Mills Incorporated (General Mills),to conduct a hydrogeologic investigation and assessment of the former underground fuel oil tank location at the General Mills facility located at 2000 West Turner Road, Lodi, San Joaquin County,California The location of the site is shown in Figure I and site features are shown in Figure 2 Introduction This letter report presents the results of the most recent quarterly monitoring activities which consisted of ground water table elevation measurements in the three existing ground water monitoring wells (MW- 1,MW-2,and MW-3) According to a letter from the San Joaquin County Department of Public Health Services, Environmental Health Division, dated July 27, 1993, ground water sampling and chemical analysis is only required on a semi-annual basis provided that no contaminants are detected Since analytical results from the March 23, 1993 sampling event, displayed in Table 2, did not indicate the presence of petroleum hydrocarbon constituents in any of the wells,sampling and chemical analysis was not conducted during the November 10, 1993, monitoring event The next quarterly monitoring and sampling is scheduled for December 1993 Ground Water Table Elevation Measurements A total of three on-site monitoring wells were measured for depth to ground water on September 10, 1993 (Figure 2) The ground water table was measured at the site between approximately 39 65 and 39 80 feet below the surface Ground water table measurements recorded to date are compiled in Table I Ground water table measurements collected on September 10, 1993,were used to construct the water table contour map shown in Figure 3 Currently the inferred direction of ground water flow is toward the south-southwest with a hydraulic gradient of approximately 0 003 Discussion Current ground water elevation measurements indicate that the ground water elevation beneath the site has decreased approximately 0 25 feet between March 1993 and September 1993 The decreased ground water elevation is probably attributed to the decrease in rainfall over this time period Delta Delivers Solutions 0061