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0 <br /> Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney[EH1 <br /> Sent: Thursday, May 03, 2012 10:42 AM <br /> To: 'Michael VanDenEnden' <br /> Subject: Well destructions at 5491 F Street <br /> Mike, <br /> Although the groundwater collected from monitoring well MW-18 does not appear to be contaminated, MW-18 is <br /> in an area of known contamination so this well can not be destroyed by pressure grouting. I checked the work <br /> plan for the installation of MW-18 and the report following the installation of MW-18. Neither explains what sized <br /> augers were used to install the conductor casing. Notes from the County inspector indicate that 15-inch augers <br /> were used to drill the hole for the conductor casing. <br /> I can tell you that if the conductor casing was installed using 15-inch augers, then the driller must use larger- <br /> diameter augers to drill out the grout in the annular seal to the total depth of the conductor casing. While the <br /> augers are still in the ground, the drillers can drill out the PVC casing inside the conductor casing using 8-inch <br /> augers to the total depth of the conductor casing. Then the drillers can pull out the conductor casing intact, <br /> section by section. After the conductor casing is removed, the driller can over-drill the well below the conductor <br /> casing to total depth and grout from the bottom upward. <br /> I have not been able to speak to our Program Coordinator about using explosives to destroy wells.,As I <br /> mentioned during our phone conversation today, our department is in the middle of moving from our old location <br /> on Main Street to our new location on Hazelton Avenue. Our Program Coordinator is busy with the move and has <br /> little time for anything else. <br /> If you need additional information, please let me know. <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 /> r. Email: vmccartneyC@sicehd.com <br /> K <br /> 5/3/2012 <br />