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Y Y. f Project 02260.04 10 April 1991 piping and the piping will be connected to the manifold. The manifold will then be piped to the equipment area. Although much of the system piping will be installed below grade, the m-in line piping will be above grade (Detail ML-1, Figure 2). This above-ground main line pipe has been approvc-d by the Lodi Fire Department. Specifications for the temporary vapor extraction probes, 4- and 6-inch vapor extraction wells, and the manifold box are given in Details VEP-1, VW-1 and V-2, and M-1 of Figure 2, respectively. WELL INSTALLATION EVAX will arrange and Supervise the installation of two monitoring wells, one groundwater monitoring well, MW-25, and one vac'ose zone monitoring well, VW-26. The wells will be screened at depth intervals of 40 to 75 feet and 30 to 60 feet below grade, respectively. During drilling activities, EVAX will sample soils for laboratory analysis and log the soils° encountered in accordance with the Unified Soil Classification System. EVAX will arrange for transport of the soil samples, under chain of custody documentation, to an analytical laboratory. EQUIPMENT INSTALLATION The system equipment, including a 500 cubic feat per minute (cfm) catalytic incinerator, pumping unit, and accumulator/water knockout device, will be delivered to the site, installed or, an equipment pad, and connected to the extraction system. Specifications for the accumulator/water knockout device are given in Detail EQ-1 of Figure 2. OPERATION AND MAINTENANCE i Catalytic Incinerator Start-up The vapor extraction system operation will be initiated. The required ' source test,ng will be performed to ensure compliance with permitted emission conditions. Hydrocarbon concentration as vapor at each probe and well will be recorded to establish a baseline to gauge the progress of the remediation. Operation The catalytic incinerator will operate 24 hours per day, seven days per week. The system will be monitored and adjusted twice monthly. Monitoring will include analyzing the influent hydrocarbon concentrations --------- -- - - --- -- -to- -document-the--progres -of.--theremed.iatio - and compliance sampling of s -. the exhaust stream A the atmosphere ensure that system oper to ation-is —---- within permitted emission conditions. The individual extraction probes - 2 -