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Would you like us to revise the Workin to indicate that the probe depths woulo determined at the time of <br />installation, based on groundwater depths at that time? <br />Joe <br />Joe Brusca <br />DBrusca <br />Associates, Inc. <br />E1ivirunm4ntal Engineering (: tvk*y <br />Brusca Associates, Inc. <br />1860 Sierra Gardens Drive, #332 <br />Roseville, CA 95661 <br />Phone (916) 677-1470 <br />Fax (916) 677-1471 <br />BruscaAssociates.com <br />From: Robert McClellon [EH] [mailto:RMcClellon@sicehd.com] <br />Sent: Thursday, November 2, 2017 9:45 AM <br />To: Joe Brusca <jbrusca@bruscaassociates.com> <br />Subject: RE: Murphy Parkway Lathrop Soil Gas Monitoring Workplan <br />Joe, I stand corrected. The depth of waste was approximately 14 feet. So single completion should do it. I think the <br />probes should be as deep as we can get them w/o being in water. Robert <br />From: Joe Brusca [mailto:jbrusca@bruscaassociates.com] <br />Sent: Tuesday, October 31, 2017 9:38 AM <br />To: Robert McClellon [EH] <br />Cc: 'Cybil Bryant' <br />Subject: RE: Murphy Parkway Lathrop Soil Gas Monitoring Workplan <br />Hello Robert, <br />Per T27CCR 20925 cited in your email, the probes should be installed above groundwater. Groundwater depth data for <br />the site are variable; depth data from the groundwater monitoring wells indicate historical depths typically on the order <br />of 14' to 15', and groundwater data from geotechnical drilling at the site indicate depths on the order of 11' to <br />14'. During our environmental drilling at the site earlier this year, groundwater was measured at depths on the order of <br />9' to 13'. Based on these data, I figured that a single -completion probe screened from about 4' to 10' would typically be <br />above the groundwater level, and appropriate. Let me know what you think. <br />Thanks, <br />Joe <br />Joe Brusca <br />