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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> so.•_� ..coG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> U): �'I� Director <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> 1 ®r_ Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • .. >— Program Manager <br /> Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (2O9) 464-01.38 Mark Barcellos,R.E.H.S. <br /> JERRY MOORE MAY O 4 2004 <br /> MOORE PETROLEUM <br /> PO BOX 67 <br /> BANTA CA 95304 <br /> RE: Work Plan for Ozone Sparging <br /> And Workplan for a Limited Subsurface Site Investigation <br /> 5491 F Street <br /> Banta CA 95304 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Addendum to Workplan for Ozone Sparging (AWP) and Workplan for a <br /> Limited Subsurface Site Investigation (WPSSI), both dated 14 January 2004 and <br /> prepared by Apex Envirotech, Inc. (AEI). Both documents were prepared in <br /> response to EHD directives issued by letter dated 10 November 2003. The site <br /> has been under soil vapor extraction (SVE) remediation off and on since 1995. <br /> To date, an estimated 4,369 pounds of hydrocarbons have been removed from <br /> the vadose zone with the current remediation system. Dissolved contaminant <br /> concentrations have not responded as well as was expected, therefore AEI <br /> prepared a work plan dated 26 September 2003 to enhance the SVE system by <br /> adding an ozone sparging system to breakdown dissolved hydrocarbons and <br /> other fuel components. EHD requested justification of the proposed locations and <br /> depths of the ozone sparge wells. <br /> The AWP provides a model of a 25-foot radius of influence for the sparge points <br /> set at a depth of 10 feet below ground water level at an air pressure� of <br /> approximately 27 pounds per square inch. Therefore the sparge points are to be <br /> set at approximately 25 feet bsg, which is approximately 10 to 12 feet below the <br /> ground water. The model is based on a uniform coarse sand as the soil media. <br /> The site-specific general lithology in the shallow zone is commonly sand from 10 <br /> to 20 feet bsg, with silt more commonly at the target depth. The number and <br /> spacing of the ozone sparge points are situated to address impacted ground <br /> water and capillary fringe zone in the areas of highest impact and along the <br /> down-gradient margin of the site. EHD approves the ozone sparging work plan <br /> as modified by the addendum. Please submit an application for a drilling permit <br /> and the $89.00 fee for each parcel to be investigated and access agreements <br /> and/or encroachment permits as appropriate. <br />