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• <br />Advanced <br />Ge o Environmental, Inc. <br />12 December 2014 <br />AGE Project No. 12-2169 <br />Mr. James Barton <br />California Regional Water Quality Control Board - Central Valley Region <br />11020 Sun Center Dr #200 <br />Rancho Cordova, CA 95670 <br />Subject: In -Situ Chemical Oxidation Pilot Test Work Plan - Addendum <br />THE TRANSMISSION STORE <br />515 West Charter Way, Stockton, California <br />Dear Mr. Barton: <br />On behalf of Mr. Don Rodgers, Advanced GeoEnvironmental, Inc. (AGE) has prepared <br />this, In -Situ Chemical Oxidation Pilot Test Work Plan — Addendum, for the site located <br />at 515 West Charter Way, Stockton, California (site). The addendum addresses <br />comments in the Central Valley Regional Water Quality Control (CVRWQCB) letter, <br />dated 07 November 2014 (Appendix A). Below, AGE has responded to each RWQCB <br />comment and/or concern as stated in the November 2014 letter: <br />CVRWQCB Comment 1: Prior to initiating the proposed scope of work, a contingency <br />plan must be submitted to the Central Valley Water Board for review and concurrence. <br />The contingency plan must include corrective actions for addressing potential <br />mobilization of adverse byproducts of the injection event. The contingency plan must <br />have established background concentrations for hexavalent chromium and bromate as <br />well as proposed action levels that will trigger the contingency plan. <br />In addition to cessation of injections, if unacceptable conditions are observed during <br />progress/compliance monitoring, all monitoring wells showing negative effects will be <br />pumped in bulk until WQO's are deemed acceptable by the RWQCB. Additionally, <br />future injection events will be suspended until further comment and approval by the <br />RWQCB. As part of the contingency plan, monitoring frequency will be altered to a <br />monthly schedule, following discovery of adverse conditions for the detrimental by- <br />product, to verify that bulk pumping has addressed the negative effects of any <br />injections. <br />837 Shaw Road • Stockton, CA 95215 <br />Telephone (209) 467-1006 • Fax (209) 467-1118 <br />