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To determine the influence pumping from MW 10 had on surrounding wells, depth to water measurements were also obtained on October 5, 2005, five days after terminating pumping from MW10, on October 17, 2005, 17 days after terminating pumping from. MW10 and prior to restart of pumping from MW10 Depth to water measurements were obtained each time pumping of MW10 was terminated and prior to restarting pumping at MW 10, see Table 3 and charts Pump rates were decreased for each pumping sequence starting at 8 9 gpm on September 30, 2005, decreased to 4 gpm on October 21, 2005 and lowered to 2 gpm on November 29, 2005 Sanchez wells MW6A, MW6B, MW7A and MW7B were non accessible, covered by Mission Blvd, repaving between September 28 and October 5, 2005 At a pump rate of approximately 9 gpm, pumping from the excavation well MW10 influences the Country Club Food and Fuel wells A pump rate of 4 gpm also influence the Country Club Food and Fuel wells A pump rate of 2 gpm has little or no effect on the Country Club Food and Fuel wells, and also little or no effect on MW9A and MW9B, see Table 3 (November 29, 2005 measurements) and Charts in Appendix D COLLECTION AND CERTIFIED ANALYSES OF GROUNDWATER SAMPLES WEGE personnel collected quarterly groundwater samples from thirteen monitor wells at the site on October 20 and 21, 2005 See Appendix A for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling and analysis Following depth to water measurements, WEGE used a truck mounted electrical submersible (Reda Flow 2) adjustable speed pump and dedicated 112 inch diameter polyethylene tubing to purge each well of three volumes of water and until the water parameters, pH, conductivity and temperature stabilized Purging was conducted at pump rates adjusted to prevent the wells from being drawn down more than 20% of their original well volumes Dedicated polyethylene tubing was used for filling three 40 ml VOAs, with no headspace, from each well The VOAs contained 0 5 ml HCl acid as a preservative The samples were delivered with accompanying chain of custody documentation to KIFF Analytical LLC (DHS certified #2236) The laboratory analyzed the water samples from each monitor well for concentrations of TPH-G, BTEX, the five oxygenants and lead scavengers 1,2 DCA and 1,2 EDB using EPA method 8260B, see Appendix B - Laboratory Report DISPOSITION OF WASTEWATER 150 gallon of groundwater and fluids produced during Quarterly Sampling (October 20 — 21, 2005) was processed through the treatment system and then stored in the 22,000 gallon Baker Tank for later discharge to sewer The water treatment system consists of five in series activated water carbon units that contain approximately 180 lbs of activated . carbon each, with a 150 gallon capacity aeration tank situated between the #2 and #3 7 Sanchez QM 4ch 2005