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"�"s s,,.:�. a mr+ vs�- x.qr ;fie -.sem a s:. �k �s.��-x .7-�- '' , �'�' -'�s"•.K.a �zF �- .:� <br /> 3 <br /> r . <br /> 2.7 FLOW UTAGRAM <br /> The flow diagram of the propound VETS hac been shown in Figure 3. <br /> - 2.8 EQUIPMENT DRAWINGS AND PILOT TESTING <br /> Figure 8 shown the size and shape of the VETS equipment proposed <br /> for contaminated soil vapor extraction and traatmont at the <br /> T former Chevron site on East Harding Way, Stockton, California. A <br /> broth re from King, Buck and Associates iu attached in `.ppendix <br /> C. <br /> On 24 April 1989, EA conducted a pilot-scale toot to determine <br /> design parameters for the proposed VETS. A 30-cfm vacuum com- <br /> pressor was attached individually to vepor extraction wells VZ, <br /> V4, and V5. Samples of the vacuum discharger were collected and <br /> analyzed onsite using EA's mobile HNU gas chromatograph. TPH <br /> concentrations and flow calculations are included as Appendix D. <br /> The concentrations of TPH at times up to 60 minuten after testing <br /> - began vera as follows: <br /> -' Time (min): < 1 15 30 45 60 <br /> �. V4 12,7010 37,500 40,100 74,000 63,600 <br /> VS 22,500 21 ,800 17,500 13,700 <br /> V2 . -- 4,500 <br /> Samples from V4 contained TPH concentrations ranging between <br /> P 40,000 and 74,000 ppm, and samples from VS averaged approximately <br /> Y' 16,000 ppm TPH. The test of V2 was ended at 15 minutes to avoid <br /> exceeding the permI tted total hydrocarbon emissions; the two <br /> samples taken indicated appreciably lover values at that point. <br /> --� ---In-addition-to-va r--concentration-mea€urements.-the-a -- --- - T <br /> Po pparent- - J <br /> transmissivity of the soil to vapor was tested on the same day. To <br /> .. that end, hollov steel soil vapor probes were driven to depths of <br /> approximately 15 feet and 25 Suet below ground surface at 5 and <br /> c:52/91918/txt 7 <br />