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v <br />California Regional Water Quality Control Board <br />Central Valle Re ion <br />Winston H. Hickox <br />Secretatyfor <br />Environmental <br />Protection <br />19 May 2000 <br />Mr. Bob Cochran <br />Chevron Products Co. <br />PO Box 6004 <br />San Ramon, CA 94583 <br />Steven T. Butler, Chair <br />Sacramento Main Office <br />Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br />3443 Routier Road, Suite A, Sacramento, California 95827-3003 <br />Phone (916) 255-3000 • FAX (916) 255-3015 <br />Ivem and Roger Baffoni <br />1175 Orangewood Drive <br />Lodi, CA 95240 <br />ADDENDA TO 7APRIL 2000 WORKPLAN, REMEDIAL WELL INSTALLATIONAND <br />ADDITIONAL SITE ASSESSMENT, FORMER CHEVRON STATION #9-5775, <br />301 WEST KETTLEMAN LANE, LODI, SAN JOA Q UIN CO UNTY <br />CLEANUP AND ABATEMENT ORDER NO. 5-00-704 <br />(a <br />Gray Davis <br />Governor <br />A 7 April 2000 Workplan For Monitoring Well Installation (Workplan) was submitted by Gettler-Ryan <br />Incorporated (GR) and approved by the San Joaquin County Environmental Health Division. GR is <br />currently providing consulting services to Chevron Products Company until the soil vapor extraction <br />system and the groundwater extraction system are installed. After this phase of work, consulting <br />services will be provided by Secor International Incorporated (Secor). Secor subsequently submitted two <br />addenda to the GR Workplan on 27 and 28 April 2000 to install remedial oxygen diffusion wells and an <br />additional well pair at the site. Although the remedial oxygen diffusion wells are premature at this time, <br />I reviewed the addenda submitted. <br />The 27 April 2000 Addendum and the 28 April 2000 Addendum describe installing a pair of monitoring <br />wells southeast of the site and eight 4 -inch diameter oxygen diffusion wells along the southern perimeter <br />of the site. The monitoring well pair will be installed across Kettleman Lane, and will further define the <br />extent of dissolved hydrocarbon contamination in the proposed downgradient direction. The installation <br />of the monitoring well pair is approved. <br />The oxygen diffusion wells are proposed as a remedial measure to confine the dissolved hydrocarbon <br />plume at the site. This application is a patented method developed at Waterloo University that uses <br />oxygen to increase biological activity and the biodegradation of petroleum hydrocarbons. The <br />application involves installing an oxygen cylinder and polyethylene tubing into each of the remedial <br />wells, and charging the polyethylene tubing with 60 psi of oxygen. The oxygen diffuses passively <br />through the wall of the polyethylene tubing into groundwater without bubbling or changing into the gas <br />phase. A low -flow pump installed at the bottom of each well circulates water through the well column. <br />Secor states that the oxygen diffusion wells will increase biodegradation of TPH, BTEX, and MtBE in <br />groundwater at the site. <br />The remedial oxygen diffusion wells are not approved at this time. As presented in the Tri -Regional <br />Recommendations, a feasibility study must be conducted to evaluate remedial alternatives and submitted <br />as part of the Problem Assessment Report (PAR). Regional Board Cleanup and Abatement Order <br />California Environmental Protection Agency <br />Ca Recycled Paper <br />