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ENVIRONMENTAL HEALTAEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> �, oL Unit Supervisors <br /> s r 2 Donna K. Heran, R.E.xs. 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> a ` Director Mike Huggins,R.E.H.S., R.D.I. <br /> At Olsen, R.E.H.S. StOCICtOri,California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Program Manager Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ <br /> GEORGE AND MEI TERANISHI DEC 0 1 2005 <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> RE: GEORGES SERVICE Site Code: 1550 <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Work Plan Addendum, In Situ Remediation Pilot Test (Addendum Plan), dated <br /> 17 November 2005, prepared on your behalf by your consultant Geological Technics, <br /> Inc. (GTI). <br /> The Addendum Plan modified the previously approved Feasibility Work Plan, In Situ <br /> Remediation Pilot Test (Plan), dated 14 June 2005, by proposing installation of two <br /> observation wells, rather than one, immediately down-gradient of the two proposed <br /> ozone injection wells, moving the observation wells to within 10 feet of the injection <br /> wells, collecting and analyzing soil samples for various gasoline constituents by EPA <br /> Method 8015/8260, reduce the sampling interval during the pilot test from daily to every- <br /> other-day and to analyze groundwater samples for dissolved trivalent and hexavalent <br /> chromium. <br /> The Addendum Plan is approved. In addition to the proposed analytical regimen, please <br /> include all analyses required by the Regional Water Quality Control Board for their <br /> approval of injecting oxidizing agents into the subsurface. <br /> Questions or comments may be directed to Nuel Henderson at (209)468-3436. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., PG <br /> Unit IV- Site Mitigation <br /> C: James L.L. Barton, PG —CVRWQCB <br /> Ray Kablanow, PG —Geological Technics Inc. <br />