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` Work Plan Canepa's Car Wasb Ma) 28, 1997 IPage-3- through MW-8 (Figure 2, Appendix A) Moderate concentrations of gasoline were detected in the soil ' from MW-6 at 50 and 55 feet bgs and from MW-7 at 50 feet bgs Low to elevated concentrations of TPH-G and BTEX were detected in groundwater samples collected from MW-6, MW-7, and MW-8 A summary of the soil and groundwater analytical data are contained in Phase Il Site Chaiactei ization, by WHF Groundwater contouring indicated that a groundwater mound existed beneath the site Tliis result suggested that recharge of the groundwater in the vicinity of MW-I and MW-2 was occurring Three potential sources of recharge were Identified 1) the car wash water recycling pit system under the building, 2) a leaking or broken sewer line that crosses the area, and 3) a leaking water supply line An MBAS (Methyl Blue Active Surfactants) analysis was conducted on groundwater samples collected at the site in July, 1994, to investigate the presence of detergents MBAS was not detected in the samples Aquifer testing (24-hour pump test) was conducted at the site by WHF on December 22 and 23, 1994 MW-1 was used as a pumping well, and MW-4, MW-6, MW-7, and MW-8 were used as observation wells The results indicated an optimum pumping rate of 5 gpm with an effective radius of 140 feet Aquifer permeability was estimated at 126 gpd/ftZ In March, 1996, the PHS/EHD requested that the SVE system and the ICU at the site be evaluated for effectiveness In May, 1996, Condor was awarded the contract for the SVE evaluation and quarterly groundwater monitoring (Ref Quarterly Groundwater Monitoring Reports, prepared by Condor, 7/96 through 4/97) Condor conducted the SVE evaluation in July, 1996 Based on the results of the evaluation, Condor recommended that operation of the ICU be suspended since the system was not capable of meeting APCD permit conditions (i e , 95% destruction efficiency) at the time of Condor's investigation Condor recommended that a 150 SCFM (standard cubic feet per minute) catalytic oxidation system I (CAT-0X) be installed at the site to extract and treat the gasoline contamination in the vadose zone (Ref Soil Vapor Extraction System Evaluation, prepared by Condor, dated September 23, 1996) On February 5 1997, Mr Ronald Rowe of the PHS/EHD approved Condor's recommendations and requested a work plan for the installation and monitoring of the CAT-OX system 3 0 PROPOSED CATALYTIC OXIDATION (CAT-OX) SYSTEM 31 Description Thi- nrnnnce d CAT-()X system is manufactured by Global Technoloizies of Milwaukee, Wisconsin (Model I - Vapor Treatment Module) The system will be installed and connected to the existing SVE wells as shown in Figure 3, Appendix A The system specifications are shown in Appendix B of tills document The system is designed to be operated 24 hours per day, 7 days per week The CAT-OX system is expected to be operated continuously for at least one (1) year before minimal hydrocarbon concciltrations are reached The CAT-OX system will include a skid mounted platform, a water vapor knockout drum, a dilution air control valve, a system blower (5 HP, 230 VAC, 60 HZ, I PH), a flame arrestor, a supplemental fuel train a thermal combustion chamber, a catalyst, and an exhaust stack 1%to— �� CONDOR