ARCHIVED REPORTS_XR0007979 - Laserfiche WebLink

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QUARTERLY GROUND WATER MONITORING Site Code 2163 Montgomery Ward Auto Service Center 5400 Pacific Avenue,Stockton,CA ' 23 SAMPLING EQUIPMENT CLEANING PROTOCOL The submersible pump and hose system (Equipment), used only to purge the wells prior ' to sampling, was decontaminated between each event using the following procedure ■ The Equipment was flushed in a solution of Alconox detergent and tap water and ' ■ The Equipment was flushed with tap water 24 EFFLUENT HANDLING ' All effluent generated during purging, sampling and equipment decontamination activities was sealed in labeled 55-gallon drums The drums were stored in a secured area 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 using EPA Method 8010, benzene, toluene ethylbenzene, and xylenes using EPA Method 8020, and total petroleum hydrocarbons as gasoline using modified EPA Method 8015 The results of the testing are shown on Table 2 and in Figure 3 The laboratory reports are contained in Appendix C Please note that the holding time of 14 days was exceeded prior to the samples being tested Therefore, the results should be evaluated considering this factor 4.0 DISCUSSION The current gauging data indicate that the round water elevations in the wells have risen on g g g g average approximately 5 8 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 eas 1 t a h draulic radient of approximatel see F1 ure 2) This represents I a change from t e most recent quarter y monitoring periods where the direction of ground «ater flow was reported to be west-southwesterly 5.0 FUTURE SITE ACTIVITIES Pursuant to a request from the County, four hydropunches (HP-1 through HP-4) were drilled at the Montgomery Ward site on January 31, 1996 On February 1, 1996, monitoring well MW-7 was drilled and installed at a location near hydropunch HP-3 Well MW-7 will be developed, purged, and sampled as part of the first quarter (January through March) 1996 ground «ater . monitoring for the Site, which will be conducted in March 1996 Project No 1232 2 ENVIRONMENTAL AUDIT, INC