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VVAT A S S O C I A T E S I N C ANALYTICAL RESULTS The groundwater samples collected from wells MW 1, MW2, MW4, MW5, MW6, and MW9 and contained detectable concentrations of TPHg and BTEX constituents The groundwater samples collected from MW5 contained detectable concentrations of TPHg and benzene The groundwater samples collected from wells MW3 and MW8 and the on-site domestic well contained no detectable concentrations of TPHg, TPHd, or BTEX The groundwater sample collected from well MW6 contained the highest concentration of MTBE The groundwater samples from wells MW1 and MW5 contained detectable concentrations of MTBE The groundwater samples collected from wells MW2, MW3, MW4, MW8, and MW9 contained no detectable concentrations of MTBE although the reporting limit for MW2 was elevated due to dilution The groundwater samples from wells MW1, MW3, MW5, MW6, and MW9 contained detectable concentrations of 1,2-DCA The groundwater samples from MW1, MW5, MW6, and MW9 contained detectable concentrations of TBA The groundwater samples collected from wells MW2, MW4, and MW8 and the on-site domestic well did not contain detectable concentrations of ETBE, DIPE, TAME, 1,2-DCA, and EDB Analytical results of groundwater samples are summarized in Table 2 and laboratory data sheets are contained in Attachment 2 ADDITIONAL SITE ACTIVITIES On the week of September 29, 2003, ATC personnel performed vapor extraction pilot testing at the site and noticed that MW8 had been knocked over apparently when the field was recently plowed ATC probed the MW8 standpipe and dug to find the well casing in an attempt to repair the well The casing was folded over at the concrete grout interface approximately 1 foot bgs, but the remainder of the casing did not appear to be damaged The vapor pilot test results will be submitted under separate cover On September 23, 2003, approximately 600 gallons of monitoring well purge water was disposed of at Crosby and Overton in Los Angeles, California On September 24, 2003, approximately twenty-five 55-gallon drums containing soil cuttings from previous site investigations were disposed of at Crosby and Overton in Los Angeles, California RECOMMENDATIONS Based on the results of the third quarter 2003 monitoring event, we recommend the following i • Continue quarterly monitoring and analyze samples from the monitoring wells for TPHg, BTEX, MTBE, ETBE, DIPE, TBA, TAME, 1,2-DCA, and EDB S IEnviromentai12529IVeports\3QR-2003 doc 3