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1 <br /> Page 7 <br />' 4.3 WELL DEVELOPMENT <br /> On May 15, 1992, after allowing at least 72 hours for the grout to set, the monitoring wells were <br />' developed by surging with a fitted surge block Surging was effected for a minimum of ten <br /> minutes After surging, the wells were pumped out using a downhole pump fitted with disposable <br /> PVC tubing A minimum of three well volumes was extracted from each well to ensure that a <br /> representative sample of groundwater would be obtained All pumps were cleaned with Alconox <br /> wash and rinsed with deionized water to prevent cross contamination between wells Groundwater <br />' well development protocol is described in Appendix C <br /> Following the recharge of each well to at least 80% of the well's original volume, the parameters of <br />' temperature (T), electrical conductivity (}tmohs) and pH were measured Additional measurements <br /> of these three parameters were made to confirm well stabilization (stabilization is defined as two or <br />' more subsequent measurements whose values are within 10% of each other) See well production <br /> data, Appendix F <br />' The discharged effluent was drummed in DOT 17-H drums and labeled for disposal in a manner <br /> consistent with the Regional Water Quality Control Board (RWQCB) and all other regulatory <br /> agency regulations and guidelines <br /> 4.4 WELL SAMPLING <br /> i <br /> Groundwater sampling commenced after each well had stabilized The procedures for sampling <br />' and transporting samples are described in Appendix A, Standard Operating Procedure (SOP) The <br /> groundwater samples were transported to Chromalab, Inc of San Ramon, California, a State <br /> certified hazardous materials testing laboratory The samples were analyzed for TPH-g and BTXE <br />' by modified EPA Method 8020 and Total Lead <br /> 1 <br /> 1 <br /> i <br /> 100 Shoreline Hwy, Suite 295 B • Mill Valley, CA 94941 • (415)381-6456 FAX (415) 389-0423 <br />