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i <br /> j=::: asMw <br /> Working to Restore Nature <br /> iQuarterly Well Pumping <br />' As agreed upon with the San Joaquin County Public Health Services (SJCPHS), <br /> groundwater is pumped out of monitoring well MW-5 on a quarterly basis as an interum <br /> remedial measure (RESNA, November 1991). For this quarter, well MW-5 was pumped <br />' on May 5, 1994 As agreed, prior to pumping, a groundwater sample designated as MW-5A <br /> was collected from the well After pumping well MW-5 for about 3 hours and extracting <br /> approximately 400 gallons of water, another groundwater sample designated as MW-5B was <br /> collected <br /> The groundwater extracted from well MW-5 was transported by Erickson Inc , a licensed <br /> trucking company from Richmond, California,to Gibson Environmental, a licensed recycling <br /> facility located in Redwood City, California. A copy of the Erickson Customer Service <br /> Order and non-hazardous waste manifest are included in Appendix A <br />' Groundwater Sampling <br /> On June 21, 1994, groundwater samples were collected from five of the seven monitoring <br />' wells (MW-1R, MW-2, MW-5, MW-b, and MW-7) in accordance with RESNNs field <br /> protocol (Appendix B). In November 1992, the SJCPHS approved semiannual sampling of <br /> monitoring wells MW-3 and MW-4 (SJCPHS, November 17, 1992) and in February 1993, <br /> they approved discontinuing sampling of these wells (Personal Communication, February 2, <br /> 1993) Groundwater purged from the wells and equipment decontamination water were <br /> placed in a licensed, trailer-mounted container and disposed of at Gibson Environmental, <br /> a licensed recycling facility located in Redwood City, California The Non-Hazardous <br /> Waste Manifest and Gibson Environmental Receipt Ticket are included in Appendix C <br /> Well and water depth information are shown on the Field Report/Data Sheets and, the <br /> volume of groundwater removed from each well and other measured sampling parameters <br /> are noted on the Well Purge Data Sheets, included in Appendix D <br />' Laboratory Analyses <br /> The groundwater samples were transported to Sequoia Analytical, a state-certified <br /> laboratory, located in Redwood City, California Samples were analyzed for the presence <br /> of TPHg and BTEX following Environmental Protection Agency(EPA) Methods 5030/8015 <br /> 1 Mod /8020 The laboratory analytical reports and chain-of-custody records are attached in <br /> Appendix E. <br /> F7132 94/Q24 2 <br />