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Ile This quarter we completed the testing for Oxygenates in the wells The results are shown on Table 3B The wells which have MtBE in their water are BM-1, BM-3 and BM-5, The test also tests for Tert-butanol (TBA) and it was found in well BM-1, BM-3, BM-5, BM-6, BM-7, BM-8 and BM-9 The well with the highest amount of TBA is well BM-3 This well had contamination in April and July of 1995 but very little in the testing during this quarter The well is located west of the original tank pit and the reason for the presence of this chemical is unknown Dissolved oxygen levels were recorded this quarter at this site The levels were measured with a calibrated YSI model 51 B meter by placing the sensor 5 feet below the surface of the water table before any bailing or other well disturbance occurred The measured levels are shown on Table 3A The oxygen levels indicate the OCR is working since all of the wells where it is placed I have high amounts of dissolved oxygen Attached is a Hazardous Waste manifest shoring that 55 gallons of purged water was removed from this site The purged water was from the testing last quarter VAPOR EXTRACTION SYSTEM I The site has been under remediation since July 1997 The weekly readings of the entenng vapor stream are listed on Table 5 and shown on Figure 2 The vapor stream is . slowly falling The extraction system was shut down from January 19 to February 4, 1998 I due to equipment failure At present the system is operating properly There was a rise in the vapor level on February 4, 1998, this was due to the shutdown Conclusions We will continue to monitor this site The next monitoring event will take place in April I 1998 Yours truly, N C John Cussen � y RG #6506 Nm 0506 Incl 6 Tables 2 Figures OF CA I 2 Laboratory Reports and Chain of Custody's 11 Sample Sheets Cc Mr Roger Liston, Darpetro, Inc Mr G L Boggs, RWQCB I i� i i