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' Report—Vapor Extraction/Air Sparge Remedial System Pae 3 P P P g Y g Former Manna Pro Site l Project No 207 3 ie September 26,2003 ' mitigating the release, but that additional engineering data was needed before large sums of money should be committed ' On June 18, 2002, Geo-Phase Environmental Inc issued a document entitled Report, Corrective Action, First Phase Remedial System Installation & Operation This report documented the construction and 90 days of operation of the first phase of the final t remedial system This system consisted of a single vapor extraction well and two air sparge wells and the associated surface equipment and pipe runs tThe first phase of system operation was deemed successful in removing at least 600 pounds of gasoline petroleum hydrocarbons from the subsurface Based on the results of ' the work, an addendum to the CAP was prepared on August 12, 2002 that recommended certain changes the final system The LOP agency accepted the addendum and work a budget was prepared to cover the anticipated costs, and the California Underground ' Storage Tank Clean-up Fund approved the costs on February 13, 2003 Construction of the system commenced on April 7, 2003 ' 1.2 Scope of Work The tasks described below were completed during this phase of work r • Renamed the vapor extraction well VEW-1 as VEW B-2 • Drilled and constructed 8 new sparge wells and 10 new vapor extraction wells r • Installed the surface equipment needed to operate the new sparge and vapor extraction wells and one previously constructed vapor extractor This included the installation of necessary conveyance piping and manifold system centrally located to assure radequate control of the remedial system r r r r • r2937 Veneman Ave, #13240 Geo-Phase Environmental Inc Phone (209)569-0293 Modesto, CA 95356 Fax(209)569-0295 r