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f P,ECE�VE� �J <br /> MAY 1 ` <br /> �---- �NVIRONMENTAL HEALTH DEPARTMENT '� <br /> SAN JOAQUIN COUNTY <br /> L. <br /> Donna K. Heran,R.E.H.S. UnitSjjpervisors <br /> 1` 304 East Weber Avenue, Third Floor Carl Bergman,R E.H,s. <br /> Al Olsen!R.E.H.S. Stockton, California .95202-270$ Mikc Huggins,RI.H.S.,KC <br /> • �'•�—."`P ' Progral iW nrn er Douglas.W.-Wilson,R.E.H.; <br /> 4Z,F&A s Telephone. (209):468-3420 <br /> ° Laurie A„Cotulla,R.E.H.S. vta[garerLagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert Mcc:ellon,RE.H.S, <br /> Mark Barcellos,R.E.H.S. <br /> JERRY MOORS <br /> MOORE PETROLEUM ` MAY ? „? 200¢ <br /> 976 W MARIPOSA AVE <br /> STOCKTON CA 95204 <br /> I <br /> E <br /> RE: Work Plan for Ozone Sparging } <br /> And Workplan for a Limited Subsurface Site Investigation <br /> E 5491 F Street , <br /> Banta CA 95304 i <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 Envirotebh,. 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 sail vapor extraction. (SVE) remediation off and on since 1 995.. - <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'AEl - I <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 /> r ground water. The model is based on a uniform coarse sand as the soil media'. l <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 slumber and <br /> spacing of the ozone sparge points are situated to address impacted ground I <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 l <br /> and the' $89.00 fee for each parcel to be investigated and access "agreements <br /> f and/or encroachment permits as appropriate. <br />