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Page 3 of <br /> implemented. The go to GWE? The CVRWQCB was very interested in this. <br /> -what is the level of acceptance for attenuation of these compounds.. is 88% <br /> ok? 32 days ok? unanswered so far. Good question. I would think that an <br /> attenuation timeframe that showed attenuation prior to moving beyond the <br /> existing monitoring well field would be acceptable. We know that the <br /> groundwater within the immediate area is not currently being used. We could <br /> do some groundwater velocity calculations and show how far Cr-VI/bromate <br /> would travel before attenuating. <br /> -are vapor intrusion concerns valid for the houses nearby? vapor monitoring <br /> points needed? It would be prudent in install a vapor point at the north end of <br /> the area where ozone sparging was proposed. <br /> Due to the current un-established policy for how the EHD and the CVRWQCB <br /> handles BST reports, Margaret is planning on discussing BSTs- WDRs-Cap <br /> implementation at our July 16 meeting. <br /> I will probably be including these items in my response letter to the BST report. <br /> I'll also comment on the additional monitoring wells, the contingency plan as <br /> well as some other concerns. <br /> I recommend you prepare a draft work plan for additional wells (remed and <br /> monitoring) and I'll let you know how many of each the EHD will expect. Will <br /> begin preparation. <br /> Are you then going to submit a RAP (system design +) after I approve the well <br /> installation work plan? <br /> or do you have another approach? Would you mind if we submitted a <br /> combined RAP (will have system design drawings included) and work plan for <br /> remedial/monitoring wells? That way maybe just one final approval from EHD <br /> to get to the installation. <br /> From: Harms, Clint [mailto:clint.Harms@stantec.com] <br /> Sent: Tuesday, July 01, 2008 10:03 AM <br /> To: Mike Infurna [EH] <br /> Subject: Circle K 1205, Lathrop <br /> Mike—Attached is a figure the shows all the sparge wells previously proposed. I have added a <br /> couple of monitoring well locations at the down gradient end of the sparge well field. I think that with <br /> these additional well and wells MW-1, MW-2, MW-3, and MW-4 which will be close to sparge wells, <br /> we can adequately monitoring CrVI and Bromate. <br /> Clinton Harms <br /> Senior Scientist <br /> Stantec <br /> Ph: (916)861-0400 Ext.228 <br /> Fx: (916)861-0430 <br /> Cell: (916)826-4186 <br /> Clint.H arms@stantec.com <br /> stantec.com <br /> The content of this email is the confidential property of Stantec and should not be copied, modified, <br /> 7/16/2008 <br />