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. ham' zc� AIII placed in labeled 55 gallon 17H drums and stored on site for lr::.er disposition. Concurrent with the boring and sampling operations, soil samples and drilling spoils were monitored using a hard held Photo Ionizing Detector (PID) to identify the presence of Total Volatile Organics (TVO) . The results of the PID readings are presented in the PPM TVO VAPOR column of the Bore Hole Log. The PID was calibrated daily using a 25 ppm gasoline vapor standard. Based upon these TVO vapor readings selected soil samples (highest readings) were hand delivered to a State Certified Laboratory (McLaren Analytical Laboratories) via the proper Chain of Custody procedures for chemical analyses. Also, soil samples collected at each interval were tested for sieve, dilatancy, moiature, permeability and plasticity properties using ASTM D2486-84 field analysis procedures. Upon completion of drilling and sampling, the boring was converted to a permanent monitor well. well construction for each well consisted of 1) installing sterilized 4" Poly-Vinyl Chloride (PVC) casing; 2) filling the annulus with clean #3 Monterey sand and bentonite pellets; 3) back-filling with neat cement; and 4) securing a water tight traffic box over the well. For specific sand, pellet, and cement intervals see WEGE Monitor Well Construction Log attatched to this report (APPENDIX A) . San Joaquin County Environmental Health Division personnel were present during the cementing process for each well. Upon well construction completion all drilling eqil:pment (augers, bit, samplers, etc. ) were sterilized by steam cleaning. A Baker Poly tank located within the secured treatment compound, was used for containment of the rinsate. 2.3 MONITOR NEU DRVELOPHXh Well development for MW-2 and NW-4-10 commenced on April 11, 1989. MW-1 and MW-3 were not developed due to the presence of gasoline. product floating on top of the water. In order to develop each well, an electrical 4" diameter submersible pump was lowered down the well and into the water. Water was pumped from each well until pH, conductivity, and temperature parameters stabilized (approximately 40 to 50 gallons). Water that was removed from each well for development purposes was contained within the Baker Poly Tank. After development each well was allowed to stabilize for 48 hours before collecting the samples for the certified laboratory. A water sample collected from the Baker tank was analyzed for TPH & BTEX using EPA Methods 8015 and 602 respectively. After reviewing the chemical results from the tank samples, Glen D. Birdzell (Deputy Director of Municipal Utilities/Wastewater) on May 31, 1989, granted permission to discharge this water to the sewer system,see APPENDIX C.