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It`Board) staff concur with the des ction of the damaged or buried we#(KP-5S, KP-5D, KP-10S and <br /> KP-BG-1) and with the location of the new monitoring wells (KP-10S-R and KP-4D). <br /> In the well destruction description, CH2M Hill proposes to overdrill the wells and backfill with a grout <br /> mixture. The language is not clear as to the height of the grout backfill. Since the damaged wells are <br /> in areas in which earth disturbance appears to be a regular event, the grout should extend to about <br /> three feet below the soil surface and the boring should be backfilled with earth to the ground surface. <br /> In the location of KP-5S and KP-5D, where an earth ramp has been built above the well heads, the <br /> grout should extend to about three feet below the lower predominate earth surface. <br /> Central Valley Water Board staff conditionally concur with the August 2010 Monitoring Well <br /> Abandonment and Construction Work Plan provided that the implementation is conducted to the <br /> satisfaction of San Joaquin County Environmental Health Department, and, if practical, three feet of <br /> earth fill is placed between the ground surface and the top of the grouted well bore. <br /> Scheduling: <br /> Koppel has proposed to conduct the work in September, to coincide with the annual groundwater <br /> sampling event which is to occur in the third quarter per Monitoring and Reporting Program No. <br /> R5-2004-0835. In view of San Joaquin County's limited staffing capabilities for oversight of field <br /> work, Central Valley Water Board staff suggest that Koppel schedule the monitoring well destruction <br /> and installation in early October. To maintain Koppel and CH2M Hill's efficiency in light of this <br /> suggestion to schedule the work in early October, Central Valley Water Board staff agree to permit <br /> Koppel to conduct the annual monitoring event in October instead of September, and will allow the <br /> Annual Report to be delivered by 30 November 2010. In considering this extension of the third <br /> quarter sampling period, Central Valley Water Board staff assume that early October will continue to <br /> be representative of the dry season. <br /> Koppel may combine the well destruction and installation reports with the Annual Report which shall <br /> be due 30 November 2010, if the monitoring well work is scheduled for early October. <br /> Thank you for providing the means to destroy the damaged well, providing suitable replacement <br /> wells, and considering this suggestion to schedule the work in October. A copy of the Work Plan is <br /> attached for your convenience. If you have any questions, you may contact me by telephone at (916) <br /> 464-4680, or by email at aterrell@waterboards.ca.gov. <br /> Amy Terrell <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive Suite 200 <br /> Rancho Cordova, CA 95670-6114 <br /> (916) 464-4680 <br /> aterrell@waterboards.ca.gov <br /> To comply with the Governor's order calling for furloughs, the Central Valley Regional Water Quality <br /> Control Board office and offices of the California Environmental Protection Agency are closed the <br /> 2nd, 3rd, and 4th Friday of every month. I apologize for any inconvenience this may cause. <br /> 2 <br />