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I <br /> Well BM-8 this quarter had no contamination, since the well was drilled in August 1993 <br />' Figure 3 shows the approximate contour pattern for the TPH plume and again well BM-4 <br /> is free of contamination, however, the wells west (upgradient) of this well are <br /> contaminated This again indicates the groundwater on the west side of our site is <br />' contaminated from sites west of our site <br /> MtBE was detected in BM-1, BM-2, BM-3, BM-4 and BM-5 BM-1 is located in the old <br /> tank pit and the level of MtBE contamination was taken from the EPA 602 water analyses <br /> where as all of the other wells were taken from EPA 8260B We actually had the water <br /> from BM-1 tested with EPA 82606, however, the results were reported at fess that 250 <br /> ug/L We believe this MtBE is related to gasoline coming from the ARCO station <br /> Dissolved oxygen levels were recorded this quarter at this site The levels were <br /> measured with a calibrated YSI model 51 B meter by placing the sensor 5 feet below the <br /> surface of the water table after the bailing of the wells The measured levels are shown <br /> on Table 3A The readings of dissolved oxygen are between 1 8 at well BM-1 and 5 1 at <br /> well SM-2 The levels of the other wells are around 3 mg/L Aerobic activity has <br /> occurred at this site and is still occurring around the old tank pit The fact that all of the <br /> water east of this site is now free of contamination is evidence that aerobic activity has <br /> and is taking place <br /> VAPOR EXTRACTION SYSTEM <br />�• The site has been under remediation since July 1997 A total of 42,549 pounds of <br /> gasoline has been removed since the beginning of this project <br /> The vapor extraction was shut down on February 5, 1999 because no BTEX chemical was <br /> being recovered This quarter we drilled vapor extraction well VW-7 and found soil <br /> contamination in this well The air pollution board requested that we apply for a new <br /> operating permit We have applied and are waiting for this boards approval We expect <br /> to restart the vapor extraction system along with air sparging in the old tank pit this <br /> quarter <br /> Conclusions <br /> We will continue to monitor this site The next monitoring event will take place in January <br /> 2000 <br /> Attached are two Hazardous Waste Manifests showing that the purged water and one <br /> Hazardous Waste Manifest showing the drill cuttings were disposed of properly <br /> Yours truly, <br /> John Cussen <br /> . RG #6506 �X506 <br /> 9�'OFc�.�F° <br />