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' FOURTH QUARTER 1997 GROUND WATER MONITORING REPORT San Joaquin County <br /> Montgomery Ward Auto Service Center Public Health Services Department <br /> 5400 Pacific Avenue, Stockton, CA Site Code 2163 <br />' chilled until delivered to the laboratory for analytical testing All samples were logged on a <br /> chain of custody record form (see Appendix B) <br />' 2 3 SAMPLING EQUIPMENT CLEANING PROTOCOL <br /> The submersible pump and hose system (Equipment), used only to purge the wells prior to <br /> 1 sampling, was decontaminated between each event using the following procedure <br /> a The Equipment was flushed in a solution of Alconox detergent and tap water, and <br />' ■ The Equipment was flushed with tap water <br /> 2 4 EFFLUENT HANDLING <br /> All effluent generated during purging, sampling and equipment decontamination activities was <br /> sealed in labeled 55-gallon drums The drums were stored in a secured area on the <br /> Montgomery Ward site pending proper disposal <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 <br /> all tests completed as part of this investigation The samples were tested for halogenated <br /> volatile organic compounds using EPA Method 8010, benzene, toluene, ethylbenzene, xylenes <br /> (BTEX) and methyl tertiary butyl ether (MTBE) using EPA Method 8020, and total petroleum <br /> hydrocarbons as gasoline (TPH-G) using modified EPA Method 8015 The results of this <br /> testing are shown in Table 2 and Figure 3 <br /> 4.0 DISCUSSIQN � <br /> The current gauging data indicate that the ground water elevations in the wells have risen on <br /> average approximately 4 5 feet as compared to the previous quarter's measurements (see Table <br /> 1) Interpretation of the ground water elevation map indicates that the predominant direction <br /> Ul giULIIiU I Wdtel flow UC1UW t11C 1V10111'Vlllely YYdiLL 51tC, dt t11C Llllle Of 1I1CdSlllemCI1C, Wdb <br /> generally easterly at a hydraulic gradient of approximately 0 008 foot/foot (see Figure 2) The <br /> I ground water flow 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 /> I <br /> Protect No 1232 - 2 - ENVIRONMENTAL.AUDIT, INC <br />