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f � Soo, 99 ,,QQ <br /> 4 DEQ i <br /> CLEARWATER <br /> G R O U P, I N C. <br /> En ai ro ne,,w Se,vicr <br /> vapor flow rate of approximately 3 times the air sparge flow rate should suffice. <br /> Considering that vapor flow rates and hydrocarbon recovery rates will be much <br /> lower, Clearwater recommends using a small blower and activated carbon to process <br /> and treat soil vapors during this last phase of remediation. <br /> Project Status <br /> Clearwater proposes to complete a detailed remediation system design plan and <br /> specifications package prior to the solicitation of bids from construction firms. As <br /> requested by the SJCPHS/EHD, Clearwater will continue quarterly groundwater <br /> monitoring and will begin preparation of an Authority to Construct permit for <br /> submission to the San Joaquin Valley Unified Air Pollution Control District <br /> (SJVUAPCD). <br /> Proposed Order for Corrective Action Tasks <br /> The proposed order for corrective action tasks is provided to identify the sequence <br /> key tasks to be completed for site clean-up: <br /> • Obtain Pre-Approval from Underground Storage Tank Clean-Up Fund for tasks <br /> leading through the solicitation of construction bids, installation of proposed <br /> vapor well PVW-4, and continued quarterly groundwater monitoring; <br /> • Prepare Detailed Remediation System Design and Specifications Package; <br /> • Obtain Authority to Construct permit from SJVUAPCD; <br /> • Bid out installation and monitoring of remediation system; <br /> • Apply for appropriate construction and well permits; <br /> • Install remediation system - obtain electric power drop, construct compound, <br /> install utility trench and horizontal well PHVW-1, install PVW-4, reconfigure <br /> wellheads, plumb wells to remedial compound; and pave site to provide surface <br /> seal to increase the effective radius of influence of soil vapor extraction; <br /> • Start-up system to extract soil vapor from RW-1, VW-1, VW-2, VW-3, PVW-4, <br /> MW-1, and MW-2 with a vacuum between approximately 30 and 50 in. w.c. if <br /> water table is low (extract vapors from PHVW-1 if water table is high), air sparge <br /> into SW-1 at a pressure of approximately 3 to 5 psi, treat vapors with thermal <br /> oxidizer, monitor soil vapor extraction and discharge as required by permits; <br /> • As influent hydrocarbon concentrations decrease with time after start-up, <br /> convert thermal oxidizer to catalytic oxidizer based on cost effectiveness; <br /> Ruiz.4491 W.Durham Ferry.Tracy.CA 4 November 12,1996 <br />