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PILOT TEST RESULTS <br /> Vacuum readings derived from the extraction wells (EX, P1 and P9) <br /> show a tight fccmation (high vacuum) . Also vacuum readings <br /> obtained from the ground water monitor wells (used as vacuum <br /> influence observation wells) `show vacuum influence covering most <br /> of the site with the exception of MW-6, see Figure 6A. <br /> The bag samples obtained from the exhaust of the blower indicate <br /> that 59.2 pounds per day of total fuel hydrocarbons can be <br /> produced from the three extraction wells with an average flow rate <br /> of 30 cubic feet per minute from the formation. This vapor stream <br /> contains 0.92 pounds per day of Benzene, 2.04 pounds per day of <br /> Toluene, 0.74 pounds per day of Ethyl Benzene and 11.3 pounds per <br /> day of Xylenes, indicating an aged petroleum product <br /> contamination problem. A total of 1160 pounds of gasoline range <br /> hydrocarbons were removed during the pilot test. <br /> r4 <br /> INTERIM VAPOR EXTRACTION <br /> VAPOR EXTRACTION SYSTEM DESIGN <br /> Wells P1, P3, EX, MW1 and MW5 have been manifolded to a vapor <br /> extraction system with xndividualed valved crifices for flow <br /> control and measurement from the individual wells, see Figure 7 <br /> and Appendix A-Figures 5B1 (3/22/91) , 5B2 (3/22/91) and 5B1 <br /> (4/10/91) . The indivift-U walls were fitted with a PVC "T" meads <br /> (4" reducing to 20) with a locking air tight cap, for well access. <br /> The "T" lateral (2") was fitted with a 1/4" pipe to tubing fitting <br /> for obtaining vacuum/pressure and temperature readings. A pipe to <br /> hose 2" union was then placed between the "T" and the 2" PVC flex <br /> hose that goes from the well to the extraction manifold. At the <br /> manifold the individual wells are connected to their own 2" PVC <br /> - riser (36" in heigth) with an orifice plate and a gate valve at <br /> the top of the riser. Vacuum/pressure ports are located an either <br /> side of the orifice plate. <br /> m Gaul I s ag avA <br /> the exp ract ors we 1 area saniPol�ded together above the <br /> gate valve to a set of two orifice risers that are in parallel <br /> prior to the vacuum pumps, see Figure ')D. Ap t the Yip Ess, X14 <br /> le Y mei d i CoWs� au�1mai �rn �d ��Irb� s <br /> i� urlp� urea o+ min" � <br /> Wr <br /> W <br /> ago r e�ttt � � ,dresp ¢ant <br /> At the initial start up of the system a "Cyclo-Purge" unit was <br /> used for mositure dropout (4/26/91-5/23/91 ) . It was later decided <br /> a to utilize two 55 gallon 17E drums with galvanized piping as <br /> } <br /> page 7 <br />