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I � � n i int ideal laboratory conditions with a maximum theoretical initial soil;vapor TPHg concentration of 222,000 mg/m3. One can see from this plot that if removal of 99%1 of the petroleum hydrocarbons requires, for example, 20 months, then the influent concentration will decline to less than 10% of the initial concentration within one month.I'Thus,'j�sizing an oxidizer for the high initial influent concentration may not be economical. It is considered prudent to size the oxidizer for the total well flow rate and initially operate erate at a reduced well flow rate. Thus, an oxidizer sized for 200 m3/hr(120 scfm) is appropriate. I; Typical standard oxidizer ratings are 100 scfm, 250 scfm, 500 scfm and 1,000 scfm. Oxidizers Ir i may be available which are sized for 255 m3/hr(l 50 scfm). If a used, but serviceable, oxidizer is available in the size range of 170 m3/hr(100 scfm) to 425 m3/hr(2 50 scfm), significant cost savings can be obtained. Outside this range, operating expenses increase significantly. Smaller units will increase the operating time and, consequently labor and sampling costs. Larger units will increase fuel costs. Therefore, a new 255 m3/hr (150 scfm) oxidizer or a used 170 in (100 scfm) to 425 M3/hr(250 scfm) oxidizer will be used, depending on availability. An oil-free air compressor will be used to supply the sparge air. S Figure 10 is a simplified Process Flow Diagram for the SVE,and air sparging systems. 4.2 Permits To complete the proposed remedial alternative for the site, the following permits are necessary j from regulatory agencies and organizations: , • San Joaquin County Public Health Services, Environmental Health Division—well permits. } • San Joaquin Valley Air Pollution Control District (APCD)—authority to construct permit, i� IR permit to operate, and soil and groundwater remediation supplemental application. 0 City of Stockton—building permit. �} 'F f 4.3 Construction A licensed well driller will install the proposed vapor extraction and air sparge wells. During the installation of the SVE wells, soil samples will be collected for analyses every 3 in (10 ft) starting at 4.6 m(15'ft) until total depth is achieved. See monitoring section for analyses. �r } &wDP-N ksac0nM0PRJIRl8IMWa28942ab.doe 4-2 M T0200W) 'i