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ENVIRONivIENTAL HEALTH DEPARTMENT <br /> °per �o SAN JOAQUIN COUNTY <br /> v 2 Donna K Heron, R.E.H.S. Unit Supervisors <br /> < Director 304 East Weber Avenue, Third Floor Carl Borgman, R.E.H.S . <br /> Iw"iP <br /> • Laurie A. Cotolla, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S ., R.D.I. <br /> .. .`P Program Manager Douglas W. Wilson, R.E.H.S. <br /> Telephone: (209) 468-3420 Margaret Lagorio, RX.H.S. <br /> Fax : (209) 464-0138 Robert McClellan, R.E.H.S. <br /> Website: www.sjgov.org/ehd/ Jeff carruesco, R.E.H.S . <br /> VINCE ERARDI APR 2 4 2006 <br /> ERARDI VENTURES <br /> PO BOX 691000 <br /> STOCKTON CA 95269 - 1000 <br /> RE: ERARDI VENTURES SITE CODE: 1229 <br /> 715 NORTH HUNTER ST <br /> STOCKTON CA 95269 <br /> A soil-vapor/groundwater dual-phase extraction (DPE) pilot test was <br /> conducted at the above-mentioned site between March 13 and March 15, 2006 <br /> as was proposed in Site Assessment and Interim Remediation Work Plan dated <br /> August 10, 2005, prepared by your consultant Advanced GeoEnvironmental, <br /> Inc. (AGE) . San Joaquin County Environmental Health Department (EHD) <br /> has received the electronically submitted (to Geotracker) analytical results for <br /> the influent and effluent vapor samples collected during the pilot test. The <br /> highest concentration of contaminants on March 13`h was 8,300 micrograms <br /> per liter (ug/1) of total petroleum hydrocarbons as gasoline (IPH-g) and 760 <br /> ug/1 benzene, and 67,000 ug/l TPH-g and 4,400 ug/1 benzene on March 15" . <br /> According to the latest quarterly report Monitoring Welllnstalladon andQuarterly <br /> Report - Fourth Quarter 2005 (the report) dated April 11 , 2006, analytical results <br /> of the groundwater samples in monitoring well MW-3 were 520,000 ug/1 TPH- <br /> g and 130,000 ug/l benzene, and 450 ug/11 ,2-dicholoroethane (1 ,2-DCA) , <br /> continuing the trend of increasing dissolved contaminant concentrations in <br /> 2005 compared to 2003 and 2004. Analytical results of the soil samples <br /> collected 15 feet below surface grade (bsg) from the extraction well DPE- 1 <br /> boring (about 10 feet east of MW-3) were 1 ,200 micrograms per kilogram <br /> (mg/kg) of TPH-g, 8,600 mg/kg TPH-diesel, and 48 mg/kg benzene, and at <br /> 30 feet bsg the results were 2,400 mg/kg TPH-g, 5,200 mg/kg TPH-d, and 95 <br /> mg/kg benzene. Depth to groundwater (DTW) in MW-3 in November, 2005 <br /> was reported at 26. 64 feet bsg. EHD has not received the report of the pilot <br /> test as of April 242 2006. <br />