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. Soil Remediation Feasibility Study Work Plan - Unocal Station No 0187 April 30, 1996 Emission Coniml System The rated destruction efficiency for the IC engine is greater than 95% at concentrations higher than 10,000 milligrams per cubic meter (mg/m3), and greater than 90% at concentrations below 10,000 mg/m3 During the course of the VET we estimate the overall average destruction efficiency will be greater than 95% The IC engine is capable of effectively treating up to 150 scfm of soil vapor from the extraction well The supplemental fuel to be used for proper operation of the IC engine is propane The IC engine is capable of automatically controlling the quantity of supplemental fuel (propane) and wellhead vapor concentrations supplied to the IC engine Influent and effluent hydrocarbon vapor samples, process temperature, and effluent temperature will all be measured as required for permit compliance and to ensure reliable operation of the system Treatment ComMund and Piping A 6-foot high, chain-linked fence with slats (approximately 15 feet by 25 feet) will be placed around the IC engine and piping manifold Construction of the treatment equipment compound will meet applicable local building codes and fire department regulations The VES compound will be placed in the southeast corner immediately adjacent to vapor extraction well UV-1, as shown on Figure 2 All aboveground piping, tees, points, valves and other soil vapor extraction components will consist of 2-inch diameter schedule $0 PVC A sampling port will be installed dust before the manifold to allow sampling of the influent vapor stream and measurement of the flow rate and vapor concentrations from the extraction well Permitting Permits will be acquired as necessary from the local building department, fire department, and San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) The proposed treatment system will reduce the observed influent concentrations to discharge limits acceptable to the SJVUAPCD An application to conduct the VET will be prepared and submitted to the SJVUAPCD and approved before startup Long Term Monitonn The long-term VET monitoring will include system maintenance and data collection twice a month, collection of influent and effluent vapor samples monthly, and recording vacuum measurements from the observation wells monthly Influent and effluent vapor stream samples will be analyzed for TPHg and BTEX • UNO187 SRW 4827 05-1 6