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i <br /> • on Table 3A The Y9 <br /> readings of dissolved oxygen are between 1 2 at well BM-1 and 8 2 at <br /> iwell BM-7 These numbers indicate that aerobic activity is taking place at this site <br /> i VAPOR EXTRACTION SYSTEM <br /> The site has been under remediation since July 1997 The weekly readings of the <br /> entering vapor stream are listed on Table 5 and shown on Figure 5 The vapor <br /> icontamination level remained the same this quarter A total of 41,384 pounds of gasoline <br /> has been removed since the beginning of this project <br /> Prior to the downtime of the system, the extracted vapor amount went down to 15 78 <br /> i <br /> pounds per da The resent level is 18 to 19 pounds per da <br /> P P Y p P P Y <br /> iConclusions <br /> " We will continue to monitor this site The next monitoring event will take place in January <br /> i1999 <br /> We had originally believed the proposed new well suggested by the EHS near well BM-3 <br /> i might provide substantial information about incoming contamination We now feel this <br /> well is not necessary as long as well BM-3 is sampled every quarter <br /> Included is a manifest showing the purged water was removed from this site <br /> I <br /> Yours i truly, y,C��SD Gt J <br /> �a �\A Cess �'sa <br /> John ussen No.6506 <br /> RG #6506 <br /> Enclosures 9�i OF CR1.�F��`r <br /> 5 Tables <br /> 5 Figures <br /> i 1 Laboratory Report and Chain of Custody <br /> 11 Sample Sheets <br /> 1 Manifest <br /> Cc Mr Roger Liston, Darpetro, Inc <br /> Mr G L Boggs, RWQCB <br /> • <br /> r <br />