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it <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> PQ�'N•. SAN JOAQUIN COUNTY Unit Supervisors" <br /> u p <br /> ervisors <br /> a ,i: Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> 0.$ - Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. StOCktori, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> l P.• Program Manager 'Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4�i.g6W Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (2Q9) 464-0138. - ,-. Mark Barcellos,R.E.H.S. <br /> ROBERT COCHRAN NOV 18 2004 <br /> CHEVRON PRODUCTS COMPANY <br /> P O BOX 6004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station 9-1452 <br /> 334 East Main Street <br /> Ripon, California <br /> By letter.dated September 14, 2004, San Joaquin County Environmental Health Department <br /> (EHD) directed you to conduct a feasibility study that would evaluate at least two alternative <br /> methods for restoring groundwater to beneficial use at the above-referenced-site. In a <br /> telephone conversation with Vicki McCartney of EHD on November 15, 2004,David Evans <br /> of Secor International Incorporated (Secor)proposed that an ozone-sparging pilot test be <br /> conducted at this site prior to submitting the feasibility study. EHD concurs that data <br /> collected from the ozone-injection pilot test will provide needed information for the <br /> feasibility study. Therefore, EHD directs you to submit a work plan for an ozone-injection <br /> pilot test by December 15, 2004, and implement the pilot study within sixty days of EHD's <br /> approval of the work plan. Please contact the Central Valley Regional Water Quality Control <br /> Board concerning bench-scale studies involving oxygen injections prior to submitting the <br /> work plan. <br /> If you have any questions regarding this letter,please contact Vicki McCartney at <br /> (209) 468-3456, or by electronic mail at vmccartney@sjcehd.com. <br /> Donna Heran;REHS,Director <br /> Environmental Health Department <br /> Vicki McCartney,REHS Nuel C. Henderson,Jr., RG <br /> Unit IV-Site Mitigation Unit IV- Site Mitigation <br /> c: David Evans - Secor <br /> James L.L. Barton- CVRWQCB <br /> _ i <br />