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FIRST QUARTER 1998 GROUND WATER MONITORING REPORT San Joaquin County Montgomery Ward Auto Service Center Public Health Services Department 5400 Pacific Avenue Stockton, CA Site Code 2163 ' 8260 for volatile organic compounds which Include benzene, toluene, eth lbenzene, xylenes, methyl tertiary butyl ether (MTBE), Tertiary Butyl Alcohol (TBA), DI-Isopropyl ether ' (DIPE), Ethyl Tertiary Butyl Ether (ETBE) and Tertiary Amyl Methyl Ether (TAME) The samples were also tested for total petroleum hydrocarbons as gasoline (TPH-G) using modified EPA Method 8015 The results of this testing are shown in Table 2 and Figure 3 ' 4.0 DISCUSSION ION 1 The current gauging data Indicate that the ground water elevations in the wells have risen on ' average approximately 4 feet as compared to the previous quarter's measurements (see Table 1) Interpretation of the ground water elevation map Indicates that the predominant direction of ground water flow below the Montgomery Ward site, at the time of measurement, was generally easterly at a hydraulic gradient of approximately 0 008 foot/foot (see Figure 2) The ' ground water flow direction for previous quarters for which data are available is as follows PERIOD FLOW DIRECTION First Quarter 93 East-Southeasterly Second Quarter 93 South-Southwesterly Third Quarter 93 South-Southwesterly Fourth Quarter 93 East-Southeasterly First Quarter 94 Easterly ' Second Quarter 94 Southerly Third Quarter 94 Southerly Fourth Quarter 94 Southeasterly ' First Quarter 95 East-Southeasterly Second Quarter 95 West-Southwesterly Third Quarter 95 West-Southwesterly ' Fourth Quarter 95 Easterly First Quarter 96 Easterly Second Quarter 96 Southwesterly Third Quarter 96 Southwesterly Fourth Quarter 96 Undetermined ' First Quarter 97 Northeasterly Second Quarter 97 Southwesterly Third Quarter 97 Southwesterly Fourth Quarter 97 Easterly First Quarter 98 Easterly Project No 1232 - 3 - ENVIRONMENTAL AUDIT, INC