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REG 603 UPDATE-6 2/21/92 test >16 MPN/100ml. All other wells wells tested below detection limits of 2 . 2 MDL/100ml . All wells (MW-2, MW-3 , MW-4, MW-5 , MW-7 and MW-8 ) tested below the detection limits of 2. 2 MDL/100ml from the January, 1992 sampling. B. SOIL: As has been shown in the "Update Status Report, February 23 , 1990" soil contaminated with gasoline range hydrocarbons exists beneath the underground storage tank excavation from the 25 foot depth to top of ground water and at the 40 foot depth to top of ground water around monitor well MW10 . The capillary fringe area ( 50 foot depth) shows the spread of contaminant out to monitor wells MW1, MW2 and MW3, see Figure 6B. C. VAPOR: VAPOR RECOVERY SYSTEM AND MONITORING As stated in Update Status Report #5, monitoring wells MWl, MW2, • MW3, MW10 and the excavation 6 inch (EX-411) have been manifolded to a vapor extraction system with individuated valved orifices for flow control sampling and vacuum and flow measurements from the individual wells. MW2 and MW3 are manifolded together with 2" tubing Tled at the wells, but can be individually tested by placing a packer below the extraction T of the well to seal that well from the vacuum system, see Figure 7 . The individual wells are fitted with a PVC "T" heads with a air tight cap, for well access. The "T" lateral (211 ) is fitted with a 1/4" pipe to tubing fatting for obtaining vacuum/pressure and temperature readings. Wells MW2, and EX-4" are fitted with a pipe to hose 211 fitting placed between the "T" and the 2" PVC flex hose that goes from the well to their individual condensate drop outs that hook into the extraction manifold. The 3" SCH 40 PVC lateral from MW3 as also fitted with a 211 pipe to hose fitting where at enters the traffic box near MW2 and is T' ed to the 2" tubing from MW2 at that point. MW1 as fitted with a 211 PVC Y to allow access to the well off the straight leg of the Y and vapor recovery off of the angled leg of -Wk— V R$,— rr».-- r•� —Troyer r�i int r�.-r �rr.m }}�Z C r� i "+- r1 ceC 7 fGG� 4. J;— j . 1LiG YS3V 4L64LK iG Y—. .y t.It./l lly it V449 I kA-- Ll-1114 LiJr,.J • i +�'� into the air prior to an 90 degree elbow connecting 211 PVC pipe at a slight incline towards the eastern fence of the compound, 8 feet above the surface. At this point the PVC pipe drops into the condensate drop out tank for MWI, prior to the vacuum extraction manifold. MW10 is manifolded to the treatment compound via SCH 40 PVC pipe underground west towards the store. Once the pipe reaches the store it connects into a condensate drop out tank (Approximately 5 gallon capacity) prior to heading over the roof of the store with 2" galvanized pipe. The condensate tank is below ground in a concrete lined traffic box. The condensate PAGE 7