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• <br /> Soil Vapor Extraction and Treatment from Dual Phase Extrachon <br /> The Soil Vapor Extraction(SVE)portion of the system would utilize existing combination <br /> groundwater morntonng/vapor extraction well MW-1 and two proposed vapor extraction <br /> wells VW-1 and VW-2 Proposed vapor extraction wells VW-1 and VW-2 will be drilled <br /> using a hollow stem auger drill ng to a depth of 20 feet below ground surface (Ibg) and <br /> constructed with 2-inch diameter PVC casing, slotted at the appropriate intervals <br /> depending upon location and slotted for both vapor and groundwater withdrawal The <br /> three wells will be connected by 2-inch diameter underground piping to a collection <br /> manifold located in the treatment compound <br /> On the basis of preliminary design review the following approach to the on-site system <br /> would be used The SVE should use a positive displacement blower, or the equivalent, <br /> with a capacity of at least 250 standard cubic feet per minute (scfm) Given the <br /> concentrations and volume of hydrocarbons in the subsurface, a thermal/catalytic <br /> oxidation unit is recommended Installation of the VES would commence after obtaining <br /> the following approvals and permits <br /> • Approval of this CAP by the RWQCB-CVR and PHS-EHD, <br /> • An authority to construct (ATC) and permit to operate (PTO) from the San Joaquin <br /> Valley Unified Air Pollution Control District (SJVUAPCD) for the selected treatment <br /> equipment, and <br /> o A City of Tracy Building Permit <br /> ® Pre-Approval from Underground Storage Tank Clean Up Fund(USTCF) <br /> Immediately after obtaining the appropriate permits and approvals, the following tasks will <br /> be performed <br /> + Procure all treatment system equipment and materials, and <br /> • Install the treatment system and treatment compound <br /> Monitoring of the vapor extraction system would consist of the following measurements <br /> • VOCs in extracted vapors, <br /> • Total flow rate of extracted vapors, <br /> + System vacuum generated by the blower, <br /> • VOCs of vapors after treatment, and <br /> • System operating temperature <br /> Penodic testing for TPHG and BTEX from individual extraction wells would be collected, <br /> and adjustments will be made to the system to minimize the duration of the cleanup The <br /> VES will be designed for continuous operation, 24 hours per day, 7 days per week, until <br /> the concentration of hvdrocarbons in the soil is reduced to asymptotic levels A detailed <br /> descnption of the selected VES will be contained in the ATC permit application <br /> Page 13 <br />