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' FOURTH QUARTER 1998 GROUND WATER MONITORING REPORT San Joaquin County <br /> Montgomery Ward Auto Service Center PubhL Health Services Department <br />' 5400 Pacific Avenue,Stockton,CA Site Code 2163 <br /> 3.0 ANALYTICAL TESTING <br />' The samples were delivered for analytical testing to American Scientific Laboratories (ASL), a <br /> state certified hazardous waste testing laboratory (Certificate No 2200) ASL is certified for all <br /> tests completed as part of this investigation The samples were tested using EPA Method 8260 <br /> for volatile organic compounds including benzene, toluene, ethylbenzene, xylenes, methyl <br /> tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), di--Isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) The samples were also <br />' tested for total petroleum hydrocarbons as gasoline (TPH-G) using modified EPA Method 8015 <br /> The results of this testing are shown in Table 2 and Figure 3 <br />' 4.0 DISCUSSION <br /> IThe current gauging data indicate that the ground water elevations in the wells have raised on <br /> average approximately 6 feet as compared to the previous quarter's measurements (see Table 1) <br /> Interpretation of the ground water elevation map indicates that the predominant direction of <br /> ground water flow below the Montgomery Ward site, at the time of measurement, was generally <br /> easterly at a hydraulic gradient of approximately 0 003 foot/foot (see Figure 2) The ground <br /> wa er ow direction for previous quarters for which data are available is as follows <br /> PERIOD FLOW DIRECTION <br /> First Quarter 93 East Southeasterly <br /> Second Quarter 93 South Southwesterly <br /> Third Quarter 93 South Southwesterly <br /> Fourth Quarter 93 East Southeasterly <br /> First Quarter 94 Easterly <br /> Second Quarter 94 Southerly <br /> Third Quarter 94 Southerly <br /> Fourth Quarter 94 Southeasterly <br /> First Quarter 95 East Southeasterly <br /> I Second Quarter 95 West Southwesterly <br /> Third Quarter 95 West Southwesterly <br /> Fourth Quarter 95 Easterly <br /> First Quarter 96 Easterly <br /> Second Quarter 96 ,Southwesterly <br /> Third Quarter 96 Southwesterly <br /> Fourth Quarter 96 Undetermined <br /> First Quarter 97 Northeasterly <br /> Second Quarter 97 Southwesterly <br /> Third Quarter 97 Southwesterly <br /> Fourth Quarter 97 Easterly <br /> First Quarter 98 Easterly <br /> IProject No 1232 - 3 - ENVIRONMENTAL AUDIT, INC <br />