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' QUARTERLY GROUND WATER MONITORING Site Code 2163 Montgomery Ward Auto Service Center 5400 Pacific Avenue,Stockton, CA ' Each water sample was sealed in four 40-milliliter volatile organic analysis (VOA) vials with Teflon septa lined lids The VOA vials were completely filled so that no head space existed between the sample and the lids The samples were labeled with the sample point identification, ' preservative added, if any, date, time and EAI project number, and immediately placed into an ice chest chilled using frozen blue and crushed Ice The samples were kept chilled until delivered to the laboratory for analytical testing All samples were logged on a chain of custody record form (see Appendix B) 23 SAMPLING EQUIPMENT CLEANING PROTOCOL ' The steel bailer (Equipment), used only to purge the wells prior to sampling, was steam cleaned between each event as part of the decontamination procedures ' 2 4 EFFLUENT HANDLING All effluent generated during purging, sampling and equipment decontamination activities N;as sealed in labeled 55-gallon drums The drums were stored on the Montgomery Ward site ' pending proper disposal 3.0 ANALYTICAL TESTING The samples were delivered for analytical testing to BC Analytical, a state certified hazardous waste testing laboratory (Certificate No 1353) The samples were tested for halogenated volatile organic compounds (HVOCs) using EPA Method 8010, benzene, toluene, xylenes and ethylbenzene (BTEX) using EPA Method 8020, and total petroleum hydrocarbons as gasoline ' (TPH-g) using modified EPA Method 8015 The results of the testing are shown on Table 2 and Figure 4 The laboratory reports are contained in Appendix C ' 4.0 DISCUSSION ' The current gauging data indicate that the ground water elevations in the wells have risen on average approximately three feet as compared to the previous quarter's measurements (see Table 1) Interpretation of the ground water elevation maps indicates that the predominant direction of ' ground water flow, at the time of measurement, was generally east-southeasterly (i e , approximately S60°E) at a hydraulic gradient of 0 0025 feet/feet (see Figures 2 and 3) This represents a change from the previous quarterly monitoring periods where the direction of ' ground water flow was reported to be southeasterly 5.0 FUTURE SITE ACTIVITIES The second quarter (April through June) ground water monitoring for the Site will be conducted in June 1995 1 ' Project No 1232 2 ENVIRONMENTAL AUDIT, INC