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ENVIRONMENTAL HEALTODEPARTMENT <br /> °p4u� SAN JOAQUIN COUNTY <br /> 2' <br /> Q• ,a Donna K Heran,R.E.H.S. Unit Supervisors <br /> " Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> c4,• • �v Program Manager Douglas W.Wilson,R.E.H.S. <br /> ��FOR� Laurie A.Cotulla,R.E.H.S. Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> DANIEL SILVA OCT Q 3�4►v!a <br /> WEST CLAY PROPERTIES <br /> PO BOX 6152 <br /> STOCKTON CA 95206 <br /> RE: West Clay Properties Site Code: 1065 <br /> 639 West Clay Street <br /> Stockton, CA 95206 <br /> San Joaquin County Environmental Health Department(EHD)has reviewed Ozone Injection Pilot Study Work <br /> Plan(the work plan)dated January 4,2005 prepared by your consultant Advanced GeoEnvironmental,Inc. <br /> (AGE). AGE proposed installing 10 ozone injection wells at the site and an ozone generator system in the area <br /> of the former underground storage tanks(USI) cluster located to the north of the above-referenced•property, <br /> and to perform a 24-week pilot study to evaluate the efficacy of an in-situ ozone injection system. EHD had <br /> not approved or disapproved the work plan because a bench scale study or a biochemical study of the effect of <br /> the ozone is now required by the Central Valley Regional Water Quality Control Board(CVRWQCB). <br /> EHD has previously received a copy of the results of various analytical tests of the soil samples and grab <br /> groundwater samples collected on April 5,2005. No title page,tables,or discussion accompanied the lab data. <br /> Based on communication with AGE on May 12,2005,EHD was informed that the data was related to the <br /> bench-scale study. On September 6,2005,CVRWQCB via electronic mail recommended that AGE provide a <br /> letter report that included tables,summary,and a conclusion along with the lab data. CVRWQCB also <br /> recommended AGE submit a work plan for the pilot study which summarizes and draws on the bench-scale <br /> study. <br /> EHD has discussed the work plan and the bench scale study with CVRWQCB on September 30,2005. <br /> CVRWQCB stated the work plan previously submitted should be revised to include information and <br /> conclusions drawn from the bench-scale study. CVRWQCB also considered 10 ozone injection points to be a <br /> full remediation system,rather than a pilot study. A pilot study should be a small-scale investigation to see if <br /> the proposed remediation system is effective in reducing the contamination at the site. Please submit by <br /> November 5,2005 a revised work plan that includes the bench-scale study results and conclusions,and a scope <br /> of work that is reflective of a pilot study not a full remediation system. <br /> Please direct any questions to Jeffrey Wong at(209)468-0335. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> #�, C�effreWJ y , r REHS Margaret agorio,REHS <br /> LOP/Site Mitigation Unit Supervisor <br /> Cc: CVRWQCB,Central Valley Region—James L.L.Barton,PG <br /> Cc: Advanced GeoEnvironmental,Inc.—Bill Little,PG <br />