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• Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Friday, September 06, 2013 4:14 PM <br /> To: 'Javad Masoudi' <br /> Subject: Frontier Transportation Facility 425 Larch Road, Tracy California <br /> Good afternoon Javad, <br /> Having reviewed Addendum to Proposed Work Plan for Groundwater Remediation, dated 27 August 2013, for <br /> Frontier Transportation Facility located at 425 Larch Road in Tracy, the following concerns still exist: <br /> You propose to install a temporary packer at approximately 13 feet below surface grade (bsg)and conduct two <br /> separate water pump tests using DPE3 and MW-3R as pumping wells to assess the petroleum hydrocarbon <br /> contamination in the shallow zone(above 13 feet bsg)versus the deeper zone(below 13 feet bsg). Both of these <br /> wells are screened between 5 and 20 feet below surface grade (bsg)with a filter pack from approximate 4 to 20 <br /> feet bsg. You have indicated that a confined clayey sand/silty sand exists from approximately 5 to 13 feet bsg. <br /> understand how the packer will prevent the flow of water within the well casing during the pumping <br /> test; however, how do you propose to purge four volumes of water from each section of the casing while <br /> preventing groundwater from entering the casing from the filter pack in the zone not being sampled? <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartnevnasicehd.com <br /> 9/6/2013 <br />