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ENVIRONTUENTAL HEALTH IIEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> _•,'. :� y Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,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 /> • p Program Manager Telephone: (209)468-3420 Douglas W.Wilson, R.E.H.S. <br /> q C I F O,R <br /> 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 /> AURANGZEB (ZEB) KHAN )MAY 18 30 <br /> ADVANCED GEOENVIRONMENTAL INC <br /> 837 SHAW ROAD <br /> STOCKTON CA 95215 <br /> DHILLON, CHARAN SINGH ETAL <br /> 2057 S EL DORADO <br /> STOCKTON CA 95206 <br /> RE: QUICK-N-SAVE #2 SITE CODE: 698 <br /> 2057 SOUTH ELDORADO AVENUE <br /> STOCKTON CA 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Gmund Water <br /> Pump Test and Soil Vapor Extraction Pilot Test Report (the report) dated April 11,2006 prepared <br /> by Advanced GeoEnvironmental, Inc. (AGE). The report documented the soil vapor <br /> extraction (SVE) and groundwater extraction (GWE) pilot tests performed at the above- <br /> referenced site in August and September of 2005,respectively. The 7-hour SVE pilot test <br /> was conducted using vapor well VW-3 (screened from 15 to 30 feet below surface grade) as <br /> the extraction point. The flow rate was between 30 and 32 standard cubic feet per minute <br /> (scftn),and induced vacuum pressure at VW-3 was between 67 and 69 inches of water. <br /> Based on the readings of the vacuum pressure observed at the surrounding wells (VW-1, <br /> VW-2,VW-4, and monitoring well MW-2),AGE calculated the SVE radius of influence <br /> (ROI) to be approximately 39.65 feet at an induced vacuum level of 0.10 inches of water, <br /> approximately 24.33 feet at an induced vacuum level of 1.0 inches of water, and <br /> approximately 9.01 feet at an induced vacuum level of 10.0 inches of water. The highest <br /> concentration of organic vapor measured at the field using a photo-ionization detector (PID) <br /> was 1,720 parts per million at 32 scfm,and the highest concentrations of the influent vapor <br /> samples analyzed at a laboratory were 17,000 micrograms per liter (ug/1) of Total Petroleum <br /> Hydrocarbons as gasoline (TPH-g), 200 ug/1 of Benzene, 200 ug/1 of Toulene, 58 ug/1 of <br /> Ethyl-benzene,260 ug/1 of Xylenes, and 43 ug/1 of methyl tert butyl ether. The GWE pilot <br /> test consisted of a variable rate and a constant rate test. Extraction well EW-1 which was <br /> screened from 30 to 50 feet below surface grade (bsg) was used as the point of groundwater <br /> extraction. During the variable rate test, the pumping rates varied from 0.6 gallons per <br /> minute (GPM) to 5.0 GPM over 10 hours 20 minutes. During the constant rate test <br /> approximately 2.5 GPM of water were extracted for 21 hours 10 minutes. AGE calculated <br /> transmissivity to be 120.7 square feet per day, the storativity value to be 0.068, the hydraulic <br /> conductivity value was 0.002 centimeters per second (cm/s), and GWE ROI at 56.7 feet. A <br /> total of 4,186 gallons of water were extracted between the variable and constant rate tests. <br /> Nine influent grab groundwater samples were collected before entering the baker tank <br /> during the GWE test. The highest concentrations were 460,000 ug/1 TPH-g, 43,000 ug/1 <br />