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Page 3 of 6 <br /> �.►� N./ <br /> 25 Cupania Circle I Monterey Park, California 91755 <br /> 323-517-9780 tel 1 323-517-9781 fax I www.atcass9c_tes_..Gom <br /> ATC is a leader in developing innovative Environmental, Geotechnical/CMT/Special Inspections and Health &Safety <br /> solutions. View our video link to learn more. PLEASE NOTE: This message, including any attachments, may <br /> include privileged, confidential and/or inside information. Any distribution or use of this communication by <br /> anyone other than the intended recipient is strictly prohibited and may be unlawful. if you are not the <br /> intended recipient, please notify the sender by replying to this message and then delete it from your <br /> computer. <br /> From: Mike Infurna [EH] [mailto:MInfurna@sjcehd.com] <br /> Sent: Tuesday, June 28, 2011 1:05 PM <br /> To: Ben Chevlen <br /> Subject: RE: TOC-CP # 5449 <br /> Ben, <br /> for wells NOT to be hooked up to remediation lines, the grout seal must be inside <br /> the traffic box and NON permeable. any liquid that may get into a traffic box must <br /> NOT be allowed to migrate down. <br /> sand is NOT impermeable and is UNacceptable as a grout seal for NON <br /> remediation wells. <br /> even remediation wells must have an impermeable seal. <br /> NO SAND is to be left inside the well vault unless it is ON top of a impermeable <br /> seal. <br /> clear? <br /> have the sand removed please so I can verify that an impermeable seal is present <br /> INSIDE the box/vault. <br /> mike <br /> From: Ben Chevlen [maiIto:ben.chevlen@atcassociates.com] <br /> Sent: Tuesday, June 28, 2011 11:57 AM <br /> To: Mike Infurna [EH] <br /> Subject: RE: TOC-CP # 5449 <br /> Mike—Welcome back from your vacation. I haven't seen photos of the well boxes, but the <br /> ATC staff that were on-site for GW sampling indicated that they were some of the nicer ones <br /> she had seen; but not sure if they are going to meet your requirements. My understanding <br /> is that the inside of the vaults is not sealed, but were completed in the following manner: <br /> • Vault set around well casing with the bottom of the flashing resting on native soil. <br /> • A concrete pad, approximately 6-inches thick, was emplaced, which was going to be <br /> flush with the surrounding asphalt. <br /> • Clean sand was placed inside the well vault. <br /> If you would like the inside of the vaults sealed, ATC can go out to the site, remove the clean <br /> sand, and emplace cement grout to form a seal approximately 4 to 6 inches thick. Please <br /> Qit cunt � <br />