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- � I <br /> r i <br /> MEETING: California Regional Water Control Board, Central Valley Region, <br /> Region 5 Sacramento Office. <br /> DATE: August 5, 2004 <br /> t <br /> TIME: 9:30AM <br /> ATTENDEES: James Barton, RWQCB <br /> Nuel Henderson, Jr. —San Joaquin County Environmental <br /> Health Department <br /> Jaff Auchterlonie — SECOR International <br /> Daniel J. Davis— SECOR International <br /> RE: Field Test Program for Evaluation of Oxidation Capacity of Groundwater <br /> l <br /> 7-Eleven Store #14117—2725 Country Club Road, Stockton, CA <br /> The meeting was conducted to discuss the specific plans and methods for evaluating <br /> potential impacts to groundwater quality through injection of oxygen for petroleum <br /> hydrocarbon remediation as presented in SECOR's Field Test Program for Evaluation of <br /> Oxidation Capacity of Groundwater. The particular concerns are: <br /> 1. Impairment of aquifer properties, e. <br /> p q p p g., precipitation of metal oxides and <br /> consequent degradation of permeability; and <br /> 2. Production of oxidized metal species with known detrimental health effects, e.g., <br /> hexavalent chromium (Cr+6 <br /> i <br /> It was agreed that an upfront analysis of the groundwater for general inorganic <br /> constituents and metals to define the baseline groundwater chemistry, followed by an <br /> evaluation and identification of potential constituents of concern would precede <br /> implementation of the field test program. Evaluation of the baseline groundwater <br /> chemistry would focus on potential oxidation reaction products and potential impacts to <br /> water quality and/or aquifer parameters.. <br /> ACTION: <br /> 1. Collect groundwater sample from MW-1 and analyze for general inorganic <br /> constituent and metals to establish baseline chemistry; and <br /> 2. Evaluate baseline chemistry for reaction products from oxygen injection that <br /> could impact aquifer properties and/or water quality.. <br /> Assuming evaluation of baseline water sample data indicates oxygen injection is unlikely <br /> to adversely affect the aquifer properties or groundwater quality, the RWQCB will then <br /> issue a letter approving SECOR's oxygen injection field test work plan. <br /> i <br /> F <br /> F <br /> E <br /> x <br /> File:7-11/14117-MEETING-RWQCB-08 05 04 <br /> 11 r <br /> r <br />