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10540 White Rock Road,Suite 180 <br /> Rancho Cordova,California 95670 <br /> Tei:(916)444-0123 <br /> Pax:(916)635-8805 C <br /> www.brownandcaldwell.com <br /> E1VUf4�0 V � <br /> PE��'1':TrS�;sJ4JE3 <br /> October 24, 2005 4Y <br /> s, 110 <br /> B R 0 W N AND <br /> _.:- -- Mr. Michael Infurna, R.E.H.S. <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue <br /> Stockton, California 95202 017/128253-200/1 <br /> Subject: Work Plan for Soil Vapor Extraction Well Installation and Soil Vapor <br /> Extraction and Air Sparge Pilot Tests,T&T Trucking Inc., <br />' U 11396 North 99 Highway,Lodi, California <br /> i <br /> t <br /> i Dear Mr. Infurna: <br /> On behalf of T&T TruckingInc. Brown and Caldwell C is leased to submit <br /> � ) p <br /> U <br /> this work plan for soil vapor extraction well installation and soil vapor extraction <br /> (SVE) and air sparge (AS) pilot tests at the subject site (Figure 1). <br /> Groundwater beneath the site has been impacted by petroleum hydrocarbons and <br />" U associated fuel oxygenates. Groundwater monitoring data indicate methyl-tertiary <br /> butyl ether (MtBE) and total petroleum hydrocarbons as gasoline (TPH-g) are the <br /> primary constituents of concern and the plume has been horizontally defined in <br /> F the Subsurface Investigation Results and Site Conceptual Model dated <br /> June 28, 2004. <br /> f The work proposed in this workplan will be conducted in two phases. The first <br /> phase of work will consist of the installation of two SVE wells to be used in the <br /> SVE pilot test. The second phase of work will consist of a SVE and AS pilot <br /> Ll testing using the new SVE wells (VEW-1 and VEW--2) and monitoring well <br /> MW-1. <br /> In SVE, a vacuum is placed on soil in the non-saturated zone. SVE technology <br /> serves to volatilize contaminants to the vapor phase and remove these vapor phase <br /> contaminants from the subsurface. Once the vapor is removed from the soil it is <br /> cleaned by either thermal, catalytic oxidation, or granular activated carbon (GAC), <br /> dependant on the concentration of hydrocarbons in the effluent from the blower. <br /> The purpose of this pilot test is to determine the concentration of hydrocarbons in <br /> irr the vapor removed from the soil, the radius of influence (ROI) of the SVE well, <br /> { and which SVE treatment technology is best suited for use on the site. <br /> PA28000\128253-T&1'Trucking SVE\Work Plan s e 2.doc <br /> r <br /> Environmental Engine e r s e✓ Consultants <br /> L <br />