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1 <br /> mom <br /> Ema RLEINr-ELDER <br /> 1 4.3 GROUND WATER MONITORING WELL INSTALLATION <br /> + Three ground water monitoring well; were drilled and installed at the project site at the <br /> ,R approximate Iocations shown on Plate Z. The monitoring wells were installed into 8 3/4. <br /> inch diameter boreholes through the hollow-stem auger. Monitoring well construction <br /> F details are shown on the boring logs (Appendix A). Ground water monitoring wells were <br /> installed in accordance with our"Ground Water Monitoring Well Installation Procedures" <br /> (Appendix B). <br /> i <br /> 4.4 GROUND WATER MONITORING WELL DEVELOPMENT <br /> F. Well development is performed to remove accumulated sediment and repair borehole <br /> , damage due to drilling. The three ground water monitoring wells were developed by <br /> 4 „ surging andum in . <br /> p P g Muds and water generated during well development were s <br /> containerized ill 55-gallon drums with tight lids and stored on-site for future disposal. <br /> . t 4.5 GROUND WATER SAMPLING <br /> In order to obtain a representative sample of the ground water;stagnant.water within the t <br /> well casing and filter material must be removed and fresh formation water all to i <br /> a <br /> replace the stagnant water. The removal of the stagnant water waa•accornplished by the x <br /> pumping of the water contained in the well casing. The purge water was containerized in <br /> 55-gallon drums. Final disposal of the water generated during the development,purgin <br /> sand sampling procedures will be s <br /> conducted in ac,ordance with local regulatory a <br /> requirements and will be responsibility of the client. Ground water samples were i <br /> ` p collected a <br /> on two,oceasroos, dune 6, 1989 and October 4, 1989. During the October sampling, a � <br /> 1 <br /> p� representative of EBMUD collected duplicate samples for analysis. The .arnpling of <br /> M J, ground water monitoring wells was done in accordance with our"Ground Water Sampling i <br /> 2 Procedures"(Appendix B). Table 1 presents our purging and sampling logs. Results of the ; <br /> analyses(Kieinfelder)are press.-ted in Table 4. <br /> 4 fi <br /> EBMUD-002-89-001 <br /> f <br /> 6 <br /> i <br /> :. .. .. ! <br /> fie+ <br />