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ENVIRONMENTAL HEALTH <br /> EN DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> o , . <br /> ?' °G Carl Borgman,R.E.H.S. <br /> 2r Z� Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor <br /> Mike Huggins,R.E.H.S.,R.D.I. <br /> N: < Director <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • a Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> qtP Fo �� Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> Program Manager <br /> MAR 19 2002 <br /> SATNAM SINGH ETAL � <br /> GET-N-GO MART <br /> 574 W GRANT LINE ROAD 5 <br /> TRACY CA 95376 <br /> RE: 574 W. Grant Line Road. SITE CODE: 1405 <br /> Tracy, CA <br /> San Joaquin County Environmental Health Department(EHD) is the lead agency <br /> providing the oversight of the investigation and cleanup of releases from underground <br /> storage tanks (USTs)within San Joaquin County. EHD has a contract with the California <br /> State Water Resources Control Board to conduct a UST corrective action program. The <br /> above referenced site was placed in the EHD Local Oversight Program (LOP) in <br /> December, 1998. <br /> A soil and groundwater investigation has been completed and a corrective action <br /> feasibility study performed at the above referenced site. EHD has received and reviewed <br /> the Soil and Groundwater Assessment and Corrective Action Plan report prepared by <br /> your consultant Aqua Science Engineers Inc. and has the following comments. <br /> The feasibility testing for corrective action included: a groundwater step draw down <br /> pumping test, a groundwater constant rate pumping test, a vapor extraction test, and an <br /> air sparging test. Data gathered during the groundwater pumping test indicated a <br /> relatively low contaminant concentration at a constant rate of removal. The report <br /> discusses that with an 8.8 gallon per minute constant pumping rate, large volumes of <br /> waste containing low gasoline concentrations would be generated during remediation and <br /> disposal costs would be very high. The vapor extraction and air sparging test data <br /> indicated low soil permeability and low flow rates. The test results showed a small radius <br /> of influence and small capture zone between vapor extraction points. The report states <br /> this technology should not be considered based upon the results from the feasibility test. <br /> In the Soil and Groundwater Assessment and Corrective Action Plan,Aqua Science <br /> evaluated the above technologies and others and have selected ozone sparging as the <br /> remedial alternative. No on-site pilot study has been completed to evaluate and <br /> determine the effectiveness of this technology. Before EHD agrees with ozone sparging <br /> as a remediation technology, a pilot test must be completed to demostrate its <br /> effectiveness. <br /> Please submit a Work Plan(WP) to perform an on-site pilot test using ozone sparging for <br /> interim remediation. The WP must include a specific design for an ozone sparging <br />