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CLEARWATER r G R O U P, I N C I4.2 Groundwater Sample Analytical Results Neither TPHg nor BTEX compounds were detected in concentrations exceeding Imethod detection limits in samples collected from any of the four monitoring wells A summary of groundwater elevations and analytical results is presented on Table 1 Hydrocarbon concentrations are displayed graphically on Figure 4 A copy of the ' laboratory reports and chain-of-custody forms are attached as Appendix B I5.0 SOIL VAPOR EXTRACTION SYSTEM OPERATION 5.1 Soil Vapor Extraction System Installation and Start-up The SVE was installed in February 1995 The system consisted of a moisture separator, particulate filter, two granular activated carbon vessels (in series) and a vacuum blower rated at 200 feet per minute (cfm) The system :s connected, via 2" schedule 80 PVC piping, to vapor wells VW-1, VW-2, VW-3, VW-4 and VW-5 (Figure 5) Soil vapor extraction commenced on February 9, 1995 from VW-4 and VW-5 only The SVE system operated continuously until March 16, 1995, when it was shut down to add VW-1, VW-2 and VW-3 to the vapor treatment stream as requested by PHS/EHD The carbon units were removed from the system, permission to run the system without the carbon was granted verbally by the SJVLJAPCD on April 19, 1995 The SVE system was restarted on April 20, 1995 and has been operating continuously (using all five vapor wells) since that date. ' The system currently consists of a 200 cubic feet per minute (cfm) regenerative vacuum blower with inline moisture separator and particulate filter, mamfolded to ' vapor wells VW-1, VW-2, VW-3, VW-4 and VW-5 5.2 Soil Vapor Extraction System Monitoring ' Table 2resents data derived from measurements of air flow, vacuum and P , hydrocarbon vapor concentrations using a flame ionization detector (FID). FID ' measurements were taken at the well heads, as well as at the system effluent ports Equivalent hexane concentrations are included because the FID equipment is ' calibrated to methane Flow rates are reported in standard cfm (scfm) because the equipment used automatically converts the actual cfm (acfm) to scfm. On September 15, 1995, vapor samples were collected from the each well sample port and the SVE effluent The samples were collected in clean tedlar bags, labeled and documented on a chain-of-custody form All air samples were analyzed by Trace D-102 3Q95 3 October 23, 1995 1