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San Joaquin County <br /> OPa'UIN' .0 Environmental Health Department DIRECTOR <br /> ? - —� Donna Heran, REHS <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS,RDI <br /> Kasey Foley, REHS <br /> FORa` Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> Phone: (209) 468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser,REHS <br /> May 30, 2013 <br /> Mr. Steve Azevedo <br /> West Clay Properties/Knife River Corporation <br /> Post Office Box 6099 <br /> Stockton, California 95206 <br /> Subject: West Clay Properties <br /> 639 West Clay Street <br /> Stockton, California 95206 <br /> Dear Mr. Azevedo: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Remediation Feasibility Evaluation, dated 10 April 2013, prepared and submitted by your <br /> consulting firm, Advanced GeoEnvironrnental, Inc. (AGE), on your behalf for the above- <br /> referenced site. The EHD had directed the submittal of a feasibility study/evaluation to <br /> remediate the petroleum hydrocarbon contamination in the `Underground Storage Tank No. 3 <br /> area (the southeast petroleum hydrocarbon contaminant plume) by letters dated 15 September <br /> 2009, 19 December 2011, 05 April 2012 and 15 November 2012. <br /> In Remediation Feasibility Evaluation, AGE compared two remedial technologies, groundwater <br /> extraction and chemical oxidation by in-situ ozone sparging (IOS), to treat petroleum <br /> hydrocarbon contamination in groundwater. Of the two remedial methods, AGE recornmended <br /> IOS and proposed preparing an ozone injection remediation work plan. <br /> The EHD concurs with AGE's recommendation to prepare a work plan to install an ozone <br /> sparging system and directs that the work plan be submitted to this agency by 31 July 2013. As <br /> mentioned in the EHD letter dated 05 April 2012, you must submit a Notice of Intent for the <br /> injection permit to comply with the terms of General Waste Discharge (WDR), and a draft <br /> Monitoring and Reporting Program to the California Regional Water Quality Control Board <br /> Central Valley Region for their review and comment. <br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) 468- <br /> 9852, or by email at vrnccartney(d�sicehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Healt Specialist Engineering Geologist <br /> C'. Mr. William R. Little, PG, Advanced GeoEnvironmental, Inc., 837 Shaw Road, <br /> Stockton, California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />