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140, <br /> San Joaquin County <br /> F�U�N Environmental Health Department DIRECTOR <br /> Donna Heron,REHS <br /> e: -- 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,RENS <br /> Jeff Carruesco,REHS,RDI <br /> • 6' . - P Website: www.sjgoorg/ehd Kasey Foley,REHS <br /> v. <br /> Phone: (209) 468-3420 Linda Turkatte,REHS <br /> Fax: (209)464-0138 <br /> September 24, 2012 <br /> Carl Knowles, Successor Trustee <br /> Knowles Family Trust Agreement <br /> P.O. Box 640 <br /> Woodbridge, CA 95258 <br /> Subject: Knowles-Roek/Roek Bros Construction <br /> 102 South Wilson Way <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Modified <br /> Remedial Action Plan (Modified RAP), dated June 25, 2012, submitted on your behalf by <br /> Stratus Environmental, Inc. (Stratus). In the Modified RAP, Stratus proposed several objectives <br /> of work listed below: <br /> 1) Properly destroy a remediation well (VW-6) that is obstructed approximately 30 feet <br /> below surface grade (bsg). <br /> 2) Reduce concentrations of groundwater contaminants near and down-gradient from the <br /> former northern USTs using ozone injection, a form of insitu chemical oxidation (ISCO). <br /> 3) Drill and install the remediation wells required to deliver ozone into the saturated zone. <br /> In order to accomplish these objectives Stratus is proposing the following scope of work: <br /> 1) Over-drill well VW-6 to a total depth (60 feet bsg) using 10-inch diameter hollow stem <br /> augers and backfill to surface with neat cement. <br /> 2) Drill and install five dual completion injection wells (IW-1 A/B through IW-5 A/B) using 8- <br /> inch diameter hollow stem augers. The 2-foot screened sections will be installed <br /> between approximately 45 and 50 feet bsg (A), and between 70 and 75 feet bsg (B). <br /> 3) Collect soil samples during the advancement of well borings IW-1 A/B through IW-5 A/B <br /> for chemical analyses, Iithological evaluation, and to assist in the construction of the <br /> ozone injection wells. <br /> 4) Mobilize and construct an ozone injection system at the property and begin sparging <br /> ozone into the subsurface using wells, IW-1 A/B through IW-5 A/B. <br />