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Geological Audit Services, Ince j 1803 W. March Lane, Suite A•Stockton, CA 95207 • (209)956-0264• FAX(209) 956-0700 say 25 March 1993 GeoAudit 663-S Deborah Reade APR 0 2 1993 i 100 E1 Rancho Road South Santa Fe, NM 87501 ENVIRONMENTAL HEALTH PERMIUSERVICES Subject: Quarterly Monitoring Report - Yellow submarine j 140 West Harding Way, Stockton, California i Dear Ms. Reade: At your request, representatives of Geological Audit Services, Inc. (GeoAudit) visited the property at 140 West Harding Way in Stockton, California (the site) to perform minimum quarterly monitoring procedures. On 16 March 1993 depth to groundwater measurements were collected for the four monitoring wells on the site. Mr. Michael Infurna of the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) was present to observe the measurements. MW-4 was surveyed relative to MW-1 and a casing elevation was • determined. Table 1 summarizes the results of the monitoring. No � groundwater samples were collected during this quarter. Groundwater gradient and direction were calculated using monitoring wells #1, #2 and #4 (MW-3 was improperly completed, and results from this well should be used with caution) . The gradient was calculated to be 0. 0020 ft/ft in a northeast direction (N 560 E) . Similar calculations were performed using monitoring wells #1, #2 and #3 . The resulting gradient was 0. 0140 ft/ft in a northeast direction (N 370 E) . While the gradient direction is similar in the two calculations, the gradient is significantly greater using monitoring wells #1, #2 and #3 . This discrepancy may be accounted for by the improper completion of MW-3 . Table 1 Groundwater Elevations 16 March 1993 Depth to Casing Groundwater Well No. groundwater Elevation Elevation 1 49 . 17 10. 395 --38. 775 2 50.83 11.957 -38. 873 3 50. 64 10. 812 -39 . 828 A •' 4 48 .87 10. 055 38. 815 1, Environmental Services•Hydrogeology•Geotechnical Services