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i♦ <br /> A.Teichert&Son Inc.Mobile Equipment Shop 103 N.'E'St.Stockton.CA. <br /> Remedial Action Plan March.1994 <br />�. These system requirements are met by several commercially available systems utilizing <br /> specialized high-vacuum regenerative or rotary lobe positive-displacement blowers and <br /> or secondary or auxiliary blowers. The dilution of inlet air with ambient atmosphere is <br /> required to raise the oxygen content of the oxygen-deficient inlet air from the subsurface. <br /> This dilution also lowers the concentration of TPH ppmv to below the lower explosive limit. <br /> We expect, however, for the 02 content of the process air to increase over time as <br /> stagnant formation air is replaced with atmospheric air. Specific system recommendations <br /> are contained in Section 4.0 <br /> 3.2 System Emissions and Effluent Monitorin <br /> Existing data was collected from a four hour pilot test. We recommend that operational <br /> data generated by continued system operation be utilized to update and supplant the <br /> current pilot test estimates. We recommend FID sampling weekly for the first 4 weeks of <br /> operation. We propose weekly air sample collection from the inlet and exhaust of the <br />' system for laboratory analysis for the first month. Monthly monitoring and sampling is <br /> recommended thereafter. The air samples will be submitted to a State-Certified analytical <br /> laboratory. The purpose of the air sample analysis is to document hydrocarbon removal <br /> and to verify treatment system effectiveness. The air sample analysis will be incorporated <br /> into existing quarterly monitoring reports. <br /> 3.3 APCD Permitting <br /> The system should be constructed and installed subsequent to securing an authority to <br /> construct permit from the APCD. Finalized system design elements, in addition to <br /> preliminary air sample analytical results should be submitted to appropriate government <br /> agencies as they become available. The results should be documented in ensuing <br /> quarterly monitoring reports. <br /> 4.0 Recommendations <br /> 4.1 System Design Recommendations <br /> As discussed above, an SVE system generating a minimum of 98-inches water column <br /> vacuum with an attendant flow of approximately 36 CFM is recommended. These <br /> minimum requirements are necessary to achieve the radius of influence desired. The high <br /> r vacuum-low flow conditions generated by subsurface conditions require that care be <br /> exercised in selecting a blower, or any other mechanism to power the system. Suitable <br /> commercial regenerative blowers or positive-displacement pumps are available. The <br /> blower selected must also provide sufficient dilution air to allow combustion in a treatment <br /> module. The dilution air may be provided by the extraction blower, or by a secondary unit. <br /> Sufficient dilution air must be added, initially, to the inlet air to raise the inlet oxygen <br /> i <br />