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Page 4 of 7 <br /> Ben, <br /> for wells NOT to be hooked up to remediation lines, the grout seal must be <br /> inside the traffic box and NON permeable. any liquid that may get into a <br /> ;{ traffic box must 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 <br /> impermeable seal. <br /> clear? <br /> have the sand removed please so I can verify that an impermeable seal is <br /> present INSIDE the box/vault. <br /> mike <br /> From: Ben Chevlen [mailto: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, <br /> but the ATC staff that were on-site for GW sampling indicated that they were some of <br /> the nicer ones she had seen; but not sure if they are going to meet your <br /> requirements. My understanding is that the inside of the vaults is not sealed, but <br /> were completed in the following manner: <br /> • Vault set around well casing with the bottom of the flashing resting on native <br /> soil. <br /> • A concrete pad, approximately 6-inches thick, was emplaced, which was <br /> going to be 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 <br /> the clean sand, and emplace cement grout to form a seal approximately 4 to 6 inches <br /> thick. Please advise. Also, the wells have been surveyed, and the initial groundwater <br /> samples (along with the semi-annual groundwater sampling event) were performed <br /> .last week. <br /> Ben Chevlen, PG I Senior Project Manager I ATC.Associates Inc. I Los Angeles <br /> 805-496-1217 direct 1 916-425-4849 mobile <br /> 25 Cupania Circle I Monterey Park, California 91755 <br /> 323-517-9780 tel ( 323-517-9781 fax I www.atcassociates.com <br /> ATC is a leader.in developing innovative Environmental, Geotechnical/CMT/Special Inspections and <br /> Health&Safety solutions. View our video link to learn more. PLEASE NOTE: This message, <br /> 8/19/2011 <br />