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by Superior Precision Analytical, Inc . , see Update #29-Appendix On December 12 , 1995, quarterly ground water samples were obtained from only those wells that exhibit gasoline range hydrocarbons in the past, see Table 1 and Appendix D. These samples were collected by a WEGE Geologist and "Chain of Custody,, delivered on ice to State certified testing laboratory, AMERICAN ENVIRONMENTAL NETWORK, INC DHS #1172 , for chemical analyses These samples were analyzed for TPH and BTEX concentrations using EPA Methods 8015/5030 and 602 respectively Since diesel has never shown up in the sample results, the samples obtained on 11/27/90 and later were analyzed using EPA methods 5030 and 602 for Total Fuel Hydrocarbons and BTEX The next quarterly sampling will occur in March, 1996 . GROUND WATER SAMPLE RESULTS Ground water samples were obtained from MW1, MW2 , MW3 , MW4 , MW8 , MW10 and MW12 This latest sample results showed levels declining at MW1, MW2 , MW3 , MW8 , and MW10 and MW12 increasing, see Table 1 and Appendix C VAPOR RECOVERY OPERATIONS AND RESULTS . The original REMOX unit operated for 1.4452 hours out of a total of 21048 hours (690) As of June 7, 1995 , the new replacement unit operated 13913 hours out of 22459 hours (62%) During the site visit on June 7, 1995, excessive noise generating from the blower prompted the noon shut down of the REMOX unit The unit remained off until September 23 , 1995 At that time the blower was replaced with 2 DR 505 Rotron blowers and the system was restarted As of December 19, 1995 an estimated 74727 pounds of gasoline range hydrocarbons have been destroyed, see Table 2, and Appendix A - Air Monitoring Report Since March 11, 1993 the vapor recovery/destruction has been declining when above 100 pounds per day of gasoline range hydrocarbons were being removed, down to 1 85 pounds per day on December 19, 1995 A request for Modification to the system has been made, to remove the TO and replace it with activated carbon vapor scrubs This modification has been approved, see Update #29-Appendix D MW-8 BIO-VENTING/OXYGEN TRANSFER On October 26, 1994 , a bio--venting source test was performed on MW-8 The purpose of this test was to evaluate the benefit of performing a once a week evacuation of the well to enhance oxygen transfer and remove residual CO2 The vapor extraction system at Former Regal Station 603 , PTO # N- 1090-1-0, was having only limited effect on the leading edge of the dissolved gasoline range plume that has traveled east from PAGE 2 R603 UPDATE-42 1/1.1/96