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f <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street <br /> Escalon,California 95320-1927 <br /> Telephone:(209)838-9888 RECENEDD <br /> Facsimile:(209)838-9883 <br /> FEB 0 8 2010 <br /> February 5, 2010 ENVIRONMENT HEALTH <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Monitoring Well Destruction Permit Applications <br /> M&L Commodities(Former Southwest Hide Company)Facility <br /> 11651 Palm Lane, Manteca, California <br /> Dear Ms. Duncan: <br /> Enclosed herewith are two sets of completed drilling permit applications and the associated fee for <br /> the destruction of eight (8) groundwater monitoring wells located at the subject site and one (1) <br /> groundwater monitoring well located off site (Figure 1). The offsite well (MW4) is located in <br /> County right-of-way on the corner of the East Highway 99 Frontage Road and Olive Avenue <br /> intersection in Manteca, CA. An Encroachment Permit has been issued by the San Joaquin County <br /> Department of Public Works for drilling in County right-of-way. A copy of the Encroachment <br /> Permit can be provided upon request. The work will be conducted in accordance with Ground <br /> Zero's January 21, 2010, Workplan for Destruction of Groundwater Monitoring Wells, which was <br /> approved by the California Regional Water Quality Control Board (RWQCB) in correspondence <br /> dated January 28,2010,both of which have been included in Attachment A. <br /> Well destruction activities will be conducted by V&W Drilling, Inc. (C57-720904) under the <br /> supervision of a Ground Zero geologist. Groundwater monitoring wells MW4, MWS, MW7, <br /> MW8, MW 15, MW 16, MW 17, MW 19R and MW21 will be destroyed by pressure grouting with <br /> neat cement grout. Prior to destruction, the total depth of each well will be measured to ensure no <br /> obstructions are present. Neat cement grout will then be pumped into each well through tremie <br /> equipment in one continuous operation until each well is completely full. Additional cement will <br /> then be added under pressure to force the grout through the well screen and into the filterpack, <br /> and subsequently checked for subsidence. If the grout level is observed to have dropped, <br /> additional cement will be added under pressure until stable. Upon stabilization, the well box and <br /> upper three feet of well casing will be removed from each well by overdrilling with a bit at least <br /> one foot in'diameter larger than the originally drilled hole. At least one foot of grout will be <br /> placed in the hole followed by clean soil to grade. The surface will be restored to match the <br /> surrounding pavement. Monitoring well construction details are summarized in Table 1. The <br /> locations of the monitoring wells are shown on the site plan provided as Figure 2. <br /> GAGROUNDZE\SWHIDE\Permits\Well Dest Permit Cvr.doc <br />