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Lor Xiong [EH] <br />From: Matt Taylor <mtaylor@wallace-kuhl.com > <br />Sent: Tuesday, April 10, 2018 3:33 PM <br />To: Lor Xiong [EH] <br />Subject: RE: Well Installation Permit for 29650 South Corral Hollow Road, Tracy <br />Good afternoon Lor, <br />As discussed. As discussed, we are installing 7 soil vapor probes that will most likely remain active for at least one month <br />and two ground water monitoring wells at the proposed Tracy Hills Elementary School located at 29650 South Corral <br />Hollow Road in Tracy, CA. <br />The well construction details summarized below are intended to match the figures submitted with the Well Permit <br />Application. <br />Soil Gas Sampling Probe Installation (7) <br />Seven soil borings will be converted into 5-foot and 10-foot deep nested soil gas sampling probes (see attached Figure <br />6). Each soil boring will be converted into a temporary soil gas sampling probe using the methods below. <br />5-foot Deep Soil Gas Sampling Probes <br />Install a 1-inch stainless steel implant with a 50-micron filtration rating attached to a 'A-inch <br />diameter Teflon tubing into each of the 10 foot deep borings at 9.5 feet bgs <br />Install a 1-inch stainless steel implant with a 50-micron filtration rating attached to a 1/4 inch <br />diameter Teflon tubing into each of the 5 foot deep borings at 4.5 feet bgs <br />The stainless steel implant will be centered within a 1-foot long sand filter pack composed of #2/12 <br />clean sand <br />A sand pack (#2/12) will be placed from 10 feet bgs to 9 feet bgs <br />A 1-foot long transitional seal composed of dry granular bentonite will be installed above the sand <br />filter from pack and hydrated for at least 2 hours from a depth of 9 feet bgs to 8 feet bgs <br />A 2-foot surface seal of neat cement will be placed above the transitional seal from a depth of 8 feet <br />bgs to 6 feet bgs <br />A 1-foot long transitional seal composed of dry granular bentonite will be installed above the sand <br />filter from pack and hydrated for at least 2 hours from a depth of 6 feet bgs to 5 feet bgs <br />A 1-foot section of sand (#2/12) will be placed from above the bentonite from a depth of 5 feet bgs <br />to 4 feet bgs <br />A 1-foot long transitional seal composed of dry granular bentonite will be installed above the sand <br />filter from pack and hydrated for at least 2 hours from a depth of 4 feet bgs to 3 feet bgs <br />A 3-foot surface seal of neat cement will be placed above the transitional seal to surface grade <br />A traffic grade flush mount well box will be installed at the surface for each boring <br />1