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N <br /> Advanced <br /> GeoEnvironmental , Inc . o >� <br /> 14 November 2014 <br /> I <br /> AGE Project No . 07- 1529 <br /> Mr. Mike Smith <br /> California Regional Water Quality Control Board - Central Valley Region <br /> 11020 Sun Center Dr #200 <br /> Rancho Cordova, CA 95670 <br /> Subject: Waste Discharge Permit Application — Addendum & <br /> Well Installation Work Plan <br /> APACHE PLASTICS ( Former) <br /> 2050 East Fremont Street, Stockton, California <br /> Dear Mr. Smith : <br /> On behalf of Mr. Bill Stoermer, Advanced GeoEnvironmental , Inc. (AGE) has prepared <br /> this Waste Discharge Permit Application — Addendum for the site located at 2050 East <br /> Fremont Street, Stockton , California (Figure 1 ) . The addendum addresses comments in <br /> the Central Valley Regional Water Quality Control (CVRWQCB) letter, dated 23 October <br /> 2014 (Appendix A) . Below, AGE has responded (in italics) to each RWQCB comment <br /> and/or concern as stated in the October 2014 letter: <br /> CVRWQCB Comment 1 : During the ISCO pilot studies in August and September 2013, <br /> chemical oxidants were injected into site monitoring and extraction wells including <br /> MW-9 and MW- 13. In the NOt AGI also proposes to utilize wells MW-9 and MW- 13 for <br /> ISCO injections. <br /> The last groundwater sampling event occurring on 9 October 2013, and current data is <br /> needed to assess groundwater conditions and evaluate the effects of the ISCO <br /> injections on water quality at the Site. Please collect groundwater samples from all <br /> available monitoring wells, including previously identified vapor extraction wells that can <br /> yield representative water quality data. <br /> Please note, utilizing the monitoring wells for the ISCO applications makes them <br /> unsuitable for evaluating water quality in the aquifer. During the remediation project, the <br /> monitoring wells should only be used to monitor the progress and effectiveness of the <br /> ISCO applications. Additional injection wells will be needed for ISCO applications in the <br /> water bearing zone targeted by MW-9 and MW- 13. <br /> 837 Shaw Road • Stockton, CA 95215. <br /> Telephone (209) 467- 1006 • Fax (209) 467- 1118 <br />