Laserfiche WebLink
i <br /> filled with a cement slurry from the top of the bentonite seal to <br /> the surface <br /> All soil & water samples were taken directly to the onsite lab <br /> after being collected & preserved by the RG, (Mr Hunter, ) and <br /> the custody chain was completed after each sample was delivered <br /> Both soil and water samples were analyzed for BTEX (EPA 8020, ) & <br /> TPHg (EPA 8015M. ) Copies of the laboratory analyses of soil & <br /> water samples, chain of custody, and QA/QC details are attached <br /> as EXHIBIT -D. <br /> RESULTS OF NINTH QUARTERLY SAMPLING OF MONITORING WELLS AT 1876 <br /> COUNTRY CLUB DRIVE CONDUCTED DECEMBER 8, 1995 • <br /> The five (5) groundwater monitoring wells were sampled on <br /> December 8 1995 by Del-Tech Geotechnical Support Services as <br /> erected by our o face A copy of the field logs, laboratory <br /> results & chain of custody is included at EXHIBIT E. Laboratory <br /> results from all sampling events are summarized on TABLE I <br /> Pertinent details are given below <br /> 1 Groundwater was measured at an average depth of 19 60 ' <br /> (-15 45 ' msl , ) a drop of 0 85 ' since the August sampling event <br /> 2 The hydraulic gradient is to the northeast at about 281 /1001 , <br /> this is slightly flatter than measured in Angus shows <br /> the potentiometric surface based upon the 12/8/95 event, with <br /> directions of all prior gradients A review of that plate <br /> reveals that six (6) of the eleven (11) measurements have been to <br /> the northeast , two (2) have been to the east, one (1) to the <br /> southeast, one (1) to the southwest, and one (1) to the north- <br /> west . <br /> 3 A summary of all laboratory results of water samples taken <br /> since monitoring began is shown on TABLE I . That data shows MW-1 <br /> continues to have the highest levels of BTEX & TPH-G, with MW-3 <br /> second highest MW-4, which had not recorded any contamination <br /> during the four prior sampla.ngs, measured minor amounts of BTEX <br /> from the 12/8/95 event . Because benzene & tolugnewere detected <br /> in the bailer blank for the well, (refer to EXHIBIT or <br /> details, ) those results cannot be considered valid. MW-5, also <br /> previously clean, revealed a minor amount of benzene . Again, the <br /> bailer blank showed contamination from benzene & toluene, <br /> suggesting that the results are not valid Bader blank "hits" <br /> were also detected in MW-1 & MW-2 The cause for that contam- <br /> ination is being investigated. <br /> DISCUSSION OF RESULTS OF WORK DONE ON 10/25 & 12/8/1995 <br /> 5 <br />