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Margaret Lagorio [EHI <br /> From: Amy Terrell [aterrell@waterboards.ca.gov] <br /> Sent: Thursday, November 09, 2006 5:29 PM <br /> To: (huff@huffnhuff.com <br /> Cc: rmarty@advgeoenv.com; Dan.Decker@conti.com; avanwaning@huffnhuff.com; <br /> jhuff@huffnhuff.com;jreynolds@huffnhuff.com; Margaret Lagorio [EH] <br /> Subject: 9405 harlan rd workplan <br /> Linda, <br /> I've received the 26 October 2006 work plan for the installation of one soil boring at the <br /> Continental Grain facility at 9405 Harlan Road. <br /> The work plan calls for obtaining 4 soil samples from a single boring for the purpose of <br /> obtaining subsurface soil characteristics to fine tune the groundwater model that you are <br /> developing for the site. The work plan calls for obtaining the soil samples from Shelby <br /> Tubes, which are thin walled open ended soil sample tubes that obtain undisturbed soil <br /> cores. The boring will be advanced to about 90 feet bgs. The boring will be advanced <br /> through two water-bearing zones. In the vicinity of the proposed boring (between MW-10B <br /> and MW-4B) both the first and the second water-bearing zone contain chloroform and carbon <br /> tetrachloride (CCL4) . The second zone contains higher concentrations of CCL4 than the <br /> first, and both zones contain similar concentrations of chloroform. <br /> Regional Water Quality Control Board staff conditionally concur with the proposed work <br /> plan subject to the following 2 conditions: <br /> 1. Grouting shall be achieved by tremie grouting while the auger bits are being removed. <br /> The auger shall not be removed before grout is placed. <br /> 2 . In addition to the proposed analyses of the soil samples, please record visual <br /> observations with an eye for indications of iron staining, sulfide deposits, or other <br /> indicators of reducing conditions relating to the zero valent iron injection. <br /> We look forward to seeing the resultant groundwater model and the supporting subsurface <br /> soil analyses. <br /> If you have any questions, you may contact me by phone at (916) 464-4680 or by email at <br /> aterrell@waterboards.ca.gov. <br /> Amy Terrell <br /> Regional Water Quality Control Board, Central Valley Region <br /> 11020 Sun Center Drive <br /> Rancho Cordova, CA 95670-6114 <br /> >>> "Linda Huff" <lhuff@huffnhuff.com> 11/9/2006 11:11 AM >>> <br /> Amy, <br /> We are planning to collect some Shelby tube samples next week to confirm <br /> the permeability of the soils within the different zones at French Camp. <br /> The ground water modeling has been completed but we think this would be <br /> helpful in substantiating the model results. San Joaquin County has <br /> been reluctant to issue the permit for the Shelby tubes because of Water <br /> Board involvement. <br /> Could you please email or call San Joaquin County to let them know this <br /> activity is acceptable? I have attached information regarding the <br /> location of the proposed Shelby tubes. <br /> 1 <br />