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GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon, California 95320-1927 Telephone: (209)838-9888 RD IJ tl E Facsimile: (209)838-9883 IJ tl U FEB 2 6 2004 February 24, 2004 ENVIRONMENT HEALTH PERMIT/SERVICES Ms. Margaret Lagorio San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject: Abandonment of Groundwater Monitoring Wells Former Southwest Hide Company Facility 11651 Palm Lane, Manteca, California Dear Ms. Lagorio: Enclosed herewith is a completed well destruction permit application along with the associated fee for the destruction of eleven groundwater monitoring wells at the facility referenced above (Figure 1). This work is directed by the California Regional Water Quality Control Board, Central Valley Region (Regional Board) as part of Waste Discharge Requirements (WDR) Order No. R5-2004- 0018 for Post-Closure of Southwest Hide Wastewater Ponds, which was adopted by the Regional Board at a Public Meeting on January 30, 2004. EHD will be notified at minimum 48 hours prior to conducting fieldwork. SCOPE OF WORK A C-57 licensed drilling contractor will destroy wells MW3, MW6, MW7A, MW713, MW9, MW10, MW11, MW12, MW14, MW18, and MW20 by pressure grouting with neat cement. Prior to abandonment, the total depth of each well will be measured to ensure no obstructions are present. Neat cement grout will be pumped into each well through tremie equipment in one continuous operation until each well is completely full. Additional cement will then be added under pressure to force the grout through the well screen and into the filterpack, and subsequently checked for subsidence. If the grout level is observed to have dropped, additional cement will be added under pressure until it stabilizes. Upon stabilization, the well box and upper three feet of well casing will be removed by overdrilling. Neat cement grout and/or native soil will be used to GAGROUNDZE\SWHIDE\REPORTS\Well Destruction WP.doc