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ENVIRON-AIENTAL HEALTROEPARTMENT <br /> oPe �" c SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.F.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Sorgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • <br /> Program Manager Douglas W.Wilson, R.E.H.S. <br /> cQ�i k oaa•c 8 Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> UL,TRAMAR INC APR 0 4 2006 <br /> 685 WEST THIRD STREET <br /> HANDFORD CA 93230 <br /> SAYED & ZAKIA ABDELWAHED <br /> 740 WEST OAK ST <br /> STOCKTON CA 95203 <br /> Re: ZE AUTO REPAIR <br /> 2255 SOUTH AIRPORT WY <br /> STOCKTON CA 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Results of Additional Site Investigation and Remedial Testing dated October 18, 2005 <br /> prepared by Horizon Environmental Inc. (Horizon). In May 2005, soil vapor <br /> extraction (SVE) and air sparge (AS) pilot studies were conducted at the <br /> above-referenced site. Soil vapor was extracted from only one vapor well VW- <br /> 1 during the first 4 hours, and during the second 4 hours SVE was performed <br /> from both VW-1 and MW-1. Influent flow was as high as 31.6 standard cubic <br /> feet per minute (scfm), and analytical results of the influent vapor sample was <br /> 12,000 parts per million by volume (ppmv) of Total Petroleum Hydrocarbons <br /> as gasoline "H-g) during the first 4 hours, and as high as of 23,000 ppmv of <br /> TPH-g during the second half. Horizon calculated a vapor extraction rate of <br /> 124.18 pounds per day (ppd) of TPH-g during the first half of the SVE test, <br /> and 472.78 ppd for the second half. For the radius of influence (ROI), <br /> Horizon reported variable distances of 38 feet to the north of VW-1, and 53 <br /> feet to the south of VW-1, and 72 feet to the southwest of VW-1. The AS test <br /> was performed as a separate test using sparge well SW-1 as the air injection <br /> point for a period of 7 hours, and the SVE was subsequently turned on at the <br /> 6.5 hour mark for a period of 1.25 hours. After 3 hours of air sparging, air <br /> pressure stabilized at 19 scfm at 13 pounds per square inch (psi) air pressure. <br /> Based on rises in concentrations of dissolved oxygen (DO), Horizon estimated <br /> the AS ROI at 24 feet to the north. The AS ROI to the south may be very <br />