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Wendy L. Cohen • -2- • 1 December 1984 <br /> Comment: The report implies that the proposed site assessment was not conducted but does <br /> not state why not. <br /> 4. Page 1-4, Item 1.3.3, Tasks 5 and 6, CPT and Hydropunch Program <br /> Report: The downgradient extent of dissolved petroleum hydrocarbons was not estimated to <br /> the east of PS/CPT-5 in the C-zone. D-zone impacts were partially defined in the vicinity of <br /> PS/CPT-4. <br /> Comment: The extent of contamination in these areas needs to be defined. Definition can be <br /> done independently of the remediation program that initially is addressing the A-zone <br /> contamination which has been defined already. <br /> 5. Page 1-5, Item 1.3.4, Task 7, Monitoring Well (MW) Installation <br /> Report: Fifteen MWs up and downgradient from STTC facilities were proposed but only nine <br /> wells within STTC lease property were installed. The locations of uninstalled wells are shown <br /> in Drawing No. 4. <br /> Comment: The report should state the rationale for the proposed location of these uninstalled <br /> wells to allow us to determine whether or not these wells should still be installed. <br /> 6. Page 2-4, Item 2.3.2, Historical Evaluation of Land Use, POSSEF Power Company <br /> Report: EMCON recommends obtaining WDRs for this company. <br /> Comment: The WDRs for the POSSEF Power Company are enclosed. <br /> 7. Page 2-4, Item 2.3.3, Historical Evaluation of Land Use, The Learner Lease Company <br /> Report: Leamer Lease is an unlikely contributor to STTC contamination because it is <br /> downgradient of STTC facilities. <br /> Comment: Nonetheless, EMCON and I should get a copy of the preliminary endangerment <br /> assessment report. <br /> 8. Page 2-4, Item 2.3.4, Historical Evaluation of Land Use, Unocal Bulk Terminal <br /> Report: Based on PHS files and Environmental Risk Information and Imaging Services report, <br /> it appears that the Unocal Bulk terminal is a potential contributor to the STTC plume. <br /> However, the RWQCB recommended site closure dated 6 June 1994. <br /> Comment: The STTC has all the investigation reports for Unocal. I consulted with EMCON <br /> and STTC Chairman Roy Thun regarding Unocal's request for closure. Both EMCON and <br /> Mr. Thun concurred with my position that Unocal did not appear to be a contributor to the <br /> STTC plume. <br /> 9. Page 2-5, Item 2.3.5, Historical Evaluation of Land Use, Riverside Cement Co. <br /> Report: It appears that the ground water at the site is not impacted and is not a current <br /> contributor to the STTC plume. <br />