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and Figure 5 The next quarterly sampling will occur in <br /> March, 1997 <br /> GROUNDWATER SAMPLE RESULTS <br /> These latest sample results showed decline in levels at MW8 , see <br /> Table 1, Figure 5, and Appendix A <br /> VAPOR RECOVERY OPERATIONS AND RESULTS <br /> The original REMOX unit operated for 14452 hours out of a total <br /> of 21048 hours (690-0 From August 18 , 1992 to March 5 , 1996 , the <br /> new replacement unit operated 18786 hours out of 31095 hours <br /> (600-. ) As of March 5 , 1996 an estimated 74849 pounds of <br /> gasoline range hydrocarbons had been destroyed by the TO (Thermal <br /> Oxidizer) <br /> A request for Modification to the system was made, to remove the <br /> TO and replace it with activated carbon vapor scrubs This <br /> modification was approved, see Update #29--Appendix D On March <br /> 6 , 1996, start-up of the Carbon Adsorbtion system occurred <br /> Table 2 is a summary of the Carbon Adsorbtion Vapor Recovery <br /> System and shows approximately 157 pounds of gasoline range <br /> hydrocarbons have been removed as of January 15 , 1997 at an <br /> average concentration of 0 01 mg/Kg as gasoline range <br /> hydrocarbons <br /> MW-8 BIO-VENTING/OXYGEN TRANSFER <br /> On October 26 , 1994 , a bio-venting source test was performed on <br /> MW-8 The purpose of this test was to evaluate the benefit of <br /> performing a once a week evacuation of the well to enhance oxygen <br /> transfer and remove residual CO2 <br /> The vapor extraction system at Former Regal Station 603 , PTO # N- <br /> 1090-1-0 , was having only limited effect on the leading edge of <br /> the dissolved gasoline range plume that has traveled east from <br /> the site, across Pacific Avenue Mr Mark Schonhoff of San <br /> Joaquin valley Unified Aar Pollution Control District has allowed <br /> Wickland to perform the weekly two hour venting of this well <br /> The weekly venting of MW8 commenced on Janaury 25 , 1995 and each <br /> lasts a duration of two hours The average flow rate calculated <br /> rliiranrf rl„r, nrr these vent 3 ng events 3_s 51 cfm with the average <br /> vapor stream containing 0 01 mg/L as gasoline and 1 2% carbon <br /> dioxide, see Table 3 <br /> The above results show that the weekly two hour venting of MW8 , <br /> as removing excess carbon dioxide and allowing oxygen transfer to <br /> occur A calculated 3 06 pounds of gasoline range hydrocarbons <br /> has been removed from MW8 as of June 27, 1996 , see Table 3 and <br /> . Appendix B - Field Notes and Appendix D for methods and <br /> proceedures <br /> PAGE 2 R603 UPDATE-46 02/04/97 <br />