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Page 1 of 2 <br /> Mike Infurna [EH] <br /> From: Barclay, Diane [Diane.Barclay@stantec.com] <br /> Sent: Friday, April 30, 2010 10:29 AM <br /> To: Mike Infurna [EH] <br /> Cc: Lathrop, Shelby S (Shaw Environmental, Inc.); Shook, Laura; Lawson, Erik <br /> Hello Mike, <br /> It was good to finally be onsite at 7647 Pacific, Stockton on April 16 and for our staff to see you there. We have <br /> now been able to evaluate the current condition of the remediation system, findings below: <br /> SVE System: <br /> • Veriflame box missing <br /> • Key missing for keyed switches <br /> • Flame eye missing <br /> • Pressure gauges on gas inlet missing <br /> • Pressure gauges on blower outlet missing <br /> • Chart recorder in poor condition, missing paper <br /> • KO glass missing <br /> • Catalytic cell in poor condition, missing insulation between cells, hole in center <br /> • LEL meter in place <br /> • Pressure switches are on blower outlet <br /> • Blower spins freely <br /> • Combustion blower spins freely <br /> • Eclipse valves operable <br /> GWE System: <br /> • Missing groundwater pumps <br /> • Missing air compressor <br /> • Some piping repair necessary <br /> • 4 carbon vessels appear to be in good shape <br /> The electrical conduit will need to be replaced and inspected by PG&E before it can be connected to the meter. <br /> We have inquired and found that this work will require a building permit, which we are requesting. <br /> After receiving the monitoring results, we have evaluated options to replace, repair, or redesign the system. Due <br /> to the extensive damage and loss of parts to the SVE system, repair of the existing SVE unit does not appear <br /> feasible. Groundwater concentrations are such that groundwater remediation will likely be required to continue. <br /> While we're evaluating the existing GWE system to see if we want to continue with GWE or pursue another form <br /> of groundwater remediation such as air sparging, we're restarting SVE with another unit to check for vapor <br /> rebound as requested by your agency. <br /> We have an SVE unit that we will be bringing to the site from another location in Fort Bragg and will expedite <br /> obtaining a new air discharge permit from the San Joaquin Valley Air Pollution Control District, which we <br /> anticipate will take 5-7 weeks. Our preliminary path forward is to run the SVE system for approximately one to <br /> two quarters to help lower dissolved concentrations in the wells, evaluate the concentrations, and then consider <br /> path forward for GW cleanup. <br /> Pending approval of permits, a PG&E inspection, and mobilizing and connecting the Fort Bragg unit, we anticipate <br /> to have the SVE system running in June 2010. <br /> Your letter of April 5, 2010 had indicated that we should repair the system and initiate rebound testing in April <br /> 2010; however, as I'm sure you saw when you were onsite, this will not be possible due to condition of the <br /> system. Please let me know if this proposed path forward and anticipated schedule is acceptable to you. <br /> s IZniNn i n <br />