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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> M Donna Horan,REHS <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> N: < Stockton, California 95202-3029 Robert McClellon,REHS <br /> Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> a f F o Ra Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> April 26, 2011 <br /> Ken Gillies <br /> Gillies Trucking <br /> P O BOX 8303 <br /> Stockton CA 95208 <br /> Subject: Gillies Trucking <br /> 3931 Newton Road <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Re: Workplan for Soil Vapor Extraction (SVET) Pilot Study, dated 21 April 2011, <br /> prepared by your consultant, Stephen Muir of Stephen G. Muir, Consulting Geologist and <br /> Geophysicist (Muir). Based on the results obtained during feasibility testing on various <br /> monitoring wells, Muir has proposed to install six vapor extraction (SVE) wells to target <br /> impacted soil in the area of vadose soil zone contamination and to conduct a pilot test for <br /> extraction of total petroleum hydrocarbons quantified as diesel and gasoline (TPHd and <br /> TPHg) and volatile organic compounds benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX). <br /> The EHD has discussed the work plan with Muir and the plan has been modified as follows: <br /> • Instead of a pair of nested 4-inch SVE wells nested in three 18-inch soil borings, six <br /> individual 4-inch wells in 8-inch soil borings will be located as cluster pairs in three <br /> locations. <br /> • Unless modified during installation in response to field data collected during <br /> advancement of the soil pilot borings, the clustered wells will have the following <br /> screen intervals — GT SVE1: 35 to 45 feet below surface grade (bsg) and 55 to 70 <br /> feet bsg; - GT-SVE2: 35 to 55 feet bsg and 55 to 70 feet bsg; and GT-SVE3: 40 to 50 <br /> feet bsg and 60 to 75 feet bsg. <br /> • The location for proposed clustered well GT-SV1 will be moved to a point between <br /> wells GT-15 and GT-10, nearer to the well GT-15. <br /> Muir states his belief that the pilot testing will comply with the requirements of the San <br /> Joaquin Valley Air Pollution Control District (SJVAPCD) limiting pilot tests to 5 days. The <br /> EHD approves the extended pilot testing provided that all SJVAPCD requirements and <br /> limitations are strictly complied with. The EHD also approves laboratory analysis of the soil <br /> and air samples collected during the well installations and extended pilot test by methods <br /> 8260B, TO-3 and/or TO-15, as appropriate for TPHg, TPHd, BTEX, the five fuel oxygenates <br /> and lead scavengers. <br /> SVE Pilot Test WP Approval Letter 0411 <br />