SITE INFORMATION AND CORRESPONDENCE

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Well Monitoring Program Quarterly report 42 due 12 November 1991 . DDRW-WB to send WCC all its data on well/crop sampling at Raspo property . The groundwater plume appears to be open at Banta Road . The TCE hit ( 10 PPB) at LM 76 suggests contamination may reach across Banta Road to local home owners - DTSC/RWQCB and DDRW-WB to get together and gosamplelocal drinking water wells for contaminants . RWQCB will run samples through their lab , DDRW-WB to check with Mr . Raspo and see if he can provide record of pesticides used on his land . To insure no break in quarterly monitoring program, COE needs guidance from RWQCB/DDRW-WB before February 1992 , in order to insure award of contract in time . WCC may propose placement of monitoring wells across Banta Road to define plume . DDRW-WB definitely opposed to this due to immense difficulty of obtaining land use/easement with property owners/Corps of Engineers Sacramento . DTSC and RWQCB expressed a desire for a full scale flow/contaminant transport model in the Site Wide RI/FS . COE stated RI/FS guidance does not require this and the issue was dropped . Interim Remediation Measure Commenced on 4 October 1991 and is running on a daily basis ( 10 hour shifts) , but not continually . It was anticipated everything to be debugged by 11 October 1991 . The week of 14 October 1991 , it should be running continually . Ensotech redeveloped injection well 2 and it is now taking more than wells 1 or 3 . The equipment is running fine , but there are a lot of small leaks in the piping . Ensotech has agreed to repair all leaks . The Ensotech report on the IRM System and February 1991 report delivery date was discussed . DTSC and RWQCB request that the flow model and contaminant model to be completed by the contractor be done by the contractor who will be doing the RI/FS . This may present more contracting problems which COE will have to solve . 2