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California Regional Water Quality Control Board %%piston H Hickox Stcretar3 ja Ent it ownenral Pi olecnon 19 May 2000 Mr Bob Cochran Chevron Products Co PO Box 6004 San Ramon, CA 94583 Central Valley Region Stet en T Butler, Chair Sacramento Main Office iniemet Address http /Avww swrcb ca goy/nvgcb5 3443 Routier Road Suite A, Sacramento, California 95827-3003 Phone (916) 255-3000 • FAX (916) 255-3015 Ivern and Roger Baffoni 1175 Orangewood Drive Lodi, CA 95240 ADDENDA TO 7APRIL 2000 WORKPLAN, REMEDIAL WELL INSTALLATIONAND ADDITIONAL SITE ASSESSMENT, FORMER CHEVRON STATION #9-5775, 301 WEST KETTLEMAN LANE, LODI, SAN JOA QUIN COUNTY CLEANUP AND ABATEMENT ORDER NO. 5-00-704 Gra\ DaN is Goieroof A 7 April 2000 Workplan For Monitoring Well Installation (Workplan) was submitted by Gettler-Ryan Incorporated (GR) and approved by the San Joaquin County Environmental Health Division GR is currently providing consulting services to Chevron Products Company until the soil vapor extraction system and the groundwater extraction system are installed After this phase of work, consulting • services will be provided by Secor International Incorporated (Secor) Secor subsequently submitted mo addenda to the GR Workplan on 27 and 28 April 2000 to install remedial oxygen diffusion wells and an additional well pair at the site Although the remedial oxygen diffusion wells are premature at this time, I reviewed the addenda submitted The 27 April 2000 Addendum and the 28 April 2000 Addendum describe installing a pair of monitoring; wells southeast of the site and eight 4 -inch diameter oxygen diffusion wells along the southern perimeter of the site The monitoring well pair will be installed across Kettleman Lane, and will further define the extent of dissolved hydrocarbon contamination in the proposed downgradient direction The installation of the monitoring well pair is approved. The oxygen diffusion wells are proposed as a remedial measure to confine the dissolved hydrocarbon plume at the site This application is a patented method developed at Waterloo University that uses oxygen to increase biological activity and the biodegradation of petroleum hydrocarbons The application involves installing an oxygen cylinder and polyethylene tubing into each of the remedial wells, and charging the polyethylene tubing with 60 psi of oxygen The oxygen diffuses passively through the wall of the polyethylene tubing into groundwater without bubbling or changing into the gas phase A low -flow pump installed at the bottom of each well circulates water through the well column Secor states that the oxygen diffusion wells will increase biodegradation of TPH, BTEX, and MtBE in groundwater at the site •The remedial oxygen diffusion wells are not approved at this time As presented in the Tri -Regional Recommendations, a feasibility study must be conducted to evaluate remedial alternatives and submitted as part of the Problem Assessment Report (PAR) Regional Board Cleanup and Abatement r j V\ h i California Environmental Protection Agency MAY C 4 r* Reri cleri Paper