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r } Ms. Mary Meays Quarterly Summary Report December 1, 1992 Page 2 SOIL REMEDIATION In November 1991, SEACOR installed a vapor extraction well (EW-1) approximately 5 feet from existing monitoring well MW-1A. A boring log and well construction diagram for vapor extraction well EW-1 are included as an attachment. In early April 1992, SEACOR installed a soil vapor extraction system at the site. The as-built system consists of vapor extraction well EW-1, a trailer- mounted regenerative blower with a 200 cubic feet per minute (CFM) capacity, and two in-line granular activated carbon vapor phase treatment vessels(2,000 pound and 200 pound capacity). The vapor extraction and treatment equipment are all housed within a paved and fenced compound. The treatment system layout is shown in the attached figure. SEACOR began operating the soil vapor extraction system on April 15, 1992. Prior to and during system start-up, a representative from the San Joaquin Valley Unified Air Pollution Control District (SJVUAPD) inspected the system and provided SEACOR with an approval to operate. SEACOR is currently monitoring system operation in accordance with the requirements of the permit to operate from SJVUAPD. Influent and effluent air concentrations are currently monitored on a monthly basis. Hydrocarbon concentrations in the influent vapor stream continue to show a decreasing trend and as of November 12, 1992 influent and effluent concentrations dropped below 50 parts per million. Also, as of November 12, 1992, an estimated 1033 pounds of gasoline had been removed from the subsurface soils. With the approval of the SJVUAPD, the granular activated carbon vessels were removed from the site by Northwestern Carbon on November 23, 1992. The system continues to operate with extracted vapors discharged directly to the atmosphere. SEACOR plans to operate the soil vapor extraction system until the end of December, at which time the system will be shut down. Following system shut down, SEACOR will advance a soil boring adjacent to the vapor extraction well and collect subsurface soil samples to evaluate residual hydrocarbon concentrations. PLANNED ACTIVITIES Soil Cuttings Disposal Approximately 1.5 cubic yards of soil cuttings generated during installation of the vapor extraction well are currently stored on-site in three (3) 55-gallon drums and a small stockpile adjacent to the treatment compound. As noted on the attached boring log for well EW-1, no odors or positive PID readings were observed in soil cuttings removed from the borehole. On November 1, 1991,following installation of well EW-1, SEACOR collected a sample (sample I.D. EW-1CG)from the soil cuttings pile and submitted the sample to GTEL for analysis of TPHg and BTEX. Laboratory analysis revealed no detectable concentrations of TPHg or BTEX. On September 15, 1992, SEACOR collected a discrete soil sample from each of the three 55-gallon drums containing soil cuttings NOV,QSR 50014-001-05 MK01