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.. _ - fir/ �✓ <br /> Vicki McCartney [EH] <br /> From: Jim Barton Ubarton@waterboards.ca.gov] <br /> Sent: Tuesday, July 05, 2005 6:33 AM <br /> To: Dan.Wynne@shawgrp.com <br /> Cc: Vicki McCartney[EH] <br /> Subject: Re: FW: re Parkinson's Arco Site Code 2224, Stockton <br /> Dan, <br /> Thank you for your inquiry. Regional Board staff .now require additional work prior to <br /> implementation of injections for Insitu Oxidation. Specifically, we need to evaluate <br /> whether Waste Discharge Requirements (WDRs, or permits) are applicable to the discharge. <br /> Our WDRs evaluation requires reviewing either a Geochemical Evaluation or a Bench Scale <br /> Test , prior to a Pilot Study. <br /> The Geochemical Evaluation requires analyzing site-specific soil and groundwater for all <br /> metals, including hexavalent chromium, and all general minerals. Using this data, ,a <br /> chemist or geochemist determines whether adverse reactions can occur (i.e. , oxidation of <br /> trivalent chromium to hexavalent chromium, or precipitation of iron oxides that would foul <br /> an oxidant injection system, etc. ) . The report would be signed by the chemist or <br /> geochemist, stating that: <br /> 1) a bench scale study would be needed to determine whether potential adverse reactions to <br /> water quality would be reversed, including the. time required for reversal, or <br /> 2) no adverse reactions would be expected with this site -specific soil chemistry, and a <br /> pilot study would be appropriate. <br /> Workplans would be submitted to this office and the local oversight agency for approval, <br /> prior to conducting the bench scale and pilot studies. <br /> Please contact me by phone or email if you have additional questions or comments. <br /> Jim Barton <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> office (916) 464-4615 <br /> fax (916) 464-4704 <br /> >>> "Wynne, Dan" <Dan.Wynne@shawgrp.com> 07/01/05 12: 46PM >>> <br /> Mr. Barton: <br /> Vicky McCarntney @ SJ County EHD suggested Shaw contact you in a letter <br /> of May, in which the County conditionally approved Shaw's CAP for 3250 <br /> West Hammer Lane, Stockton. This is a fuel leak LOP site with a <br /> dissolved gasoline plume near in-use retail gasoline UST systems. Shaw <br /> proposed ozone microsparge for the property. <br /> I understand that the Central Valley has implemented a policy of greater <br /> caution regarding insitu oxidation, whether by permanganate or ozone. I <br /> expect that there are concerns we'll need to address regarding the <br /> potential for localized mobilization of metals. <br /> 1 <br />