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GROUNDWATER SAMPLE RESULTS These latest sample results show most of the wells continue to be below laboratory detection limits (MW1, MW4 , MW5, MW6, MW7, MW9 , and MW11) , and a decline in levels at MW2, MW3 , and MW10 . MW8 showed a slight increase while MW12 remained about the same in contaminant levels, see Table 1 and Appendix A VAPOR RECOVERY OPERATIONS AND RESULTS The original REMOX unit operated for 14452 hours out of a total of 21048 hours (69%) From August 18 , 1992 to March 5, 1996, the new replacement unit operated 18786 hours out of 31095 hours (60%) . As of March 5, 1996 an estimated 74849 pounds of gasoline range hydrocarbons had been destroyed by the TO (Thermal Oxidizer) . A request for Modification to the system was made, to remove the TO and replace it with activated carbon vapor scrubs This modification was approved, see Update #29-Appendix D. On March 6, 1996 , start-up of the Carbon Adsorbti.on system occurred Table 2 is a summary of the Carbon Adsorbtion Vapor Recovery System and shows approximately 172 pounds of gasoline range hydrocarbons have been removed as of March 18 , 1997 at a concentration ranging between 0 01 and 0 26 mg/Kg as gasoline range hydrocarbons, see Appendix C - Weekly VES monitoring notes and WEGE lab 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 the site, across Pacific Avenue Mr Mark Schonhoff of San Joaquin Valley Unified Air Pollution Control District has allowed Wickland to perform the weekly two hour venting of this well The weekly venting of MW8 commenced on Janaury 25 , 1995 and each lasts a duration of two hours The average flow rate calculated during during these venting events is 41 cfm with the average vapor stream containing 0 05 mg/L as gasoline and 1% carbon dioxide, see Table 3 The above results show that the weekly two hour venting of MW8 , is removing excess carbon dioxide and allowing oxygen transfer to occur A calculated 4 . 91 pounds of gasoline range hydrocarbons 4a and 346 pounds of carbon as CO2 has been removed from MW8 as of March 11, 1997, see Table 3 and Appendix D - Field Notes and Appendix E for methods and proceedures PAGE 2 R603 UPDATE-47 04/03/97