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• Page 1 of 2 <br /> Vicki McCartney [EH] <br /> From: Nuel Henders n [EH] <br /> Sent: Wednesday, ugust 29, 2012 3:29 PM <br /> To: Vicki McCartney [EH] <br /> Subject: FW: Comfort Air, 1607 Turnpike Rd., Stockton CA <br /> Attachments: Tables & Calc (App B) - ComAir Aquifer Pump Test- 0308.pdf, CA Figure 2 Site Plan.pdf; CA <br /> Figure 3 Geo X Seciton AA'-w.pdf; CA Figure 5 Adsorbed TPH-g AA'-.pdf <br /> Vicki, <br /> Go ahead and approve their CP P, They answered our questions, although I don't think dropping the water level in <br /> the well to say 35 feet bsg is th same as dropping it to 35' bsg in the surrounding impacted soil. <br /> Nuel <br /> From: Tim Cuellar [mailto:tcue lar@advgeoenv.com] <br /> Sent: Wednesday, August 29, 012 11:05 AM <br /> To: Vicki McCartney [EH] <br /> Cc: Bill Little; Nuel Henderson EH]; greg@comfortairinc.com <br /> Subject: Comfort Air, 1607 Tu-npike Rd., Stockton CA <br /> Vicki, <br /> AGE has reviewed furtlier the request within the EHD letter (dated 07/26/12) for <br /> the Comfort Air site. The letter states that the EHD has reviewed the Corrective <br /> Action Plan (CAP) date J 06/25/12, in which AGE concluded that high vacuum DPE <br /> was the most viable of tion to remediate the vadose zone, capillary fringe and <br /> upper saturated zone i.e. depths between 10' and 45' bsg). The CAP also <br /> recommended the Inst Ilation of 2 DPE wells screened at depths between 10'- <br /> 30' (DPE-1) and between 25'-45' (DPE-2). However in the letter, the EHD stated <br /> that additional information was needed to justify the proposed screen interval at <br /> depths between 25'-45', and that it was necessary to demonstrate to the EHD that <br /> draw-down will occur at DPE-2 to de-water the well for actual dual phase <br /> extraction to occur. <br /> In accordance with yoOr 07/26/12 letter, we would like to offer the following <br /> additional information for your consideration: <br /> . The core of hydrocarbon soil impact is located directly beneath the former <br /> UST area to depths of 45 feet bsg (see attached figure); the core of <br /> hydrocarbon dissolved impact appears to be located within the first <br /> hydrogeologic init (i.e. between 17' and 50'). <br /> . Remediation wells EW-1, EW-2 and DPE-1 are proposed solely to address <br /> the core of hyc rocarbon-impact at depths between 10' and 30'. Initially, a <br /> DPE-stinger wi I be slowly lowered to within a few feet of the bottom of <br /> each well casi g with the intent of completely de-watering each well and <br /> 8/29/2012 <br />