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. Quarterly ground water samples were obtained on June 21, 1995 see Table 1 These samples were collected by a WEGE Geo-technician 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 801.5/5030 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 September, 1995 GROUND WATER SAMPLE RESULTS The latest sample results showed an overall decline in contaminant levels associated with the ground water at this site, see Table 1 VAPOR RECOVERY OPERATIONS AND RESULTS The original REMOX unit operated for 14452 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 will remain shut down until and inspection and if necessary repair can be performed As of June 7, 1995 an estimated 74612 pounds of gasoline range hydrocarbons have been destroyed, see Table 2 , Chart-Figure 7 and Appendix C - Air Monitoring Report Since March 11 , 1993 the vapor recovery/destruction has been declining when above 100 pounds per day of gasoline range hydrocarbons where being removed, down to 1 27 pounds per day on June 7 , 1995 Presently, the system has been shut down for repairs 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 Prior to shut down on June 7 , 1995 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 the site, across Pacific Avenue Two source tests, of two hours each, were conducted on MW8 The well is near the leading edge of the plume and results • indicate that a two hour vacuum extraction once a week will help control the migration of the plume and will enhance biodegradation by removing CO2 and enhancing oxygen transfer PAGE 2 R603 UPDATE-40 8/29/95