Laserfiche WebLink
R603 UPDATE-11 11/19/92 <br /> • <br /> extraction on the ground water. <br /> 2. 2 GROUND WATER QUARTERLY SAMPLING <br /> Ground water samples have been collected since December 9, 1988, <br /> see Table 1. These samples were collected by a WEGE geologist and <br /> "Chain of Custody" hand delivered or, ice to a state certified <br /> testing laboratory (McLaren Analytical or Chemtech (MATRIX) <br /> Analytical Laboratories) for chemical analyses. These samples <br /> were analyzed for TPH and BTEX concentrations using EPA Methods <br /> 8015 and 602 respectively. Since diesel has never shown up in the <br /> sample results, the samples obtained on 11/27/90 and later were <br /> analyzed using EPA methods 5030 and 602 for Total Fuel <br /> Hydrocarbons and BTEX. The next quarterly sampling will occur in <br /> December, 1992. <br /> 3 . 0 RESULTS <br /> 3. 1 PRODUCT AND RECOVERY <br /> During the initial site assessment and subsequent site visits, <br /> floating product was observed in monitor wells MW-1, MW-3 and <br /> MW10 . Product thickness .in MW-1 has ranged from 0 . 01 ' to 1 .26 ' <br /> and from 0 . 17 ' to 1. 66 ' in MW-3 . Only a product sheen has been <br /> observed in MW10 during the March, June and September, 1991 and <br /> the March 10 , 1992 sampling. Observations made during this update <br /> status report period show that MW1 is free of any floating product <br /> and MW10 and MW3 have a sheen of floating product, see Figure 5 <br /> and Table 1. These reductions in product thickness can be <br /> attributed to the on going vapor extraction at this site. The <br /> recovered gasoline is amber yellow and appears to be fresh (no <br /> apparent degradation) . <br /> 3. 2 VAPOR RECOVERY <br /> VAPOR RECOVERY SYSTEM AND MONITORING <br /> As stated in Update Status Report #5 , mona-torj-ng wells MW1, MW2, <br /> MW3, MW10 and the excavation 6 inch (EX--411 ) have been individually <br /> .,ianifolded to a vapor extract-on system --nth i nd,��,dual �Talved <br /> orifices for flow control sampling and vacuum and flow <br /> measurements from the individual wells. MW2 and MW3 are <br /> manifolded together with 2" tubing T ' ed at the wells, but can be <br /> individually tested by placing a packer below the extraction T of <br /> the well to seal that well from the vacuarn system. The individual <br /> wells are fitted with a PVC "T" head with an air tight cap for <br /> well access. The "T" lateral ( 211 ) 1s fitted with a 1/4" pipe to <br /> tubing fitting for obtaining vacuum/pressure and temperature <br /> readings. wells MW2 , and EX-4" are fitted with a pipe to hose 2" <br /> PAGE 4 <br />