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WerAy L. Cohen • -3- • 1 December 1994 <br /> Comment: It also is unlikely that the site was a contributor to the STTC plume in the past <br /> because the overexcavated area showed no TPH as gasoline ('IPHg) or benzene, toluene, <br /> ethylbenzene or xylene (BTEX) in soil and ground water samples. If Riverside Cement <br /> Company was a contributor, residual soil and ground water contamination would have been <br /> detected in the excavation. <br /> 10. Page 2-5, Item 2.3.6, Historical Evaluation of Land Use, Stockton Petroleum <br /> Report: EMCON recommends that additional information be obtained, if possible, from the <br /> PHS regarding the status of the site investigation. <br /> Comment: During a recent discussion with Ms. Diane Hinson of PHS, she said that she <br /> would send me a copy of a report of recent investigations at the site. I requested that she also <br /> send a copy to the S 17C. Nevertheless, EMCON should follow up on the status of the <br /> investigation report with the PHS. <br /> 11. Page 4-3, Item 4.1.4, C-Zone Geology <br /> Report: The lateral extent of C-zones has not been defined to the north and west of the STTC <br /> facilities. <br /> Comment: The report should explain the significance of these undefined areas. <br /> 12. Page 4-3, Item 4.1.5, D-Zone Geology <br /> Report: The lateral extent of the D-zone sands has not been defined. <br /> Comment: The report should provide recommendations to define the D-zone extent. <br /> 13. Page 4-8, Item 4.3.4, Dissolved Petroleum Hydrocarbons <br /> Report: Figures 8-11 represent TPHg isoconcentration maps. <br /> Comment: The report also should include BTEX isoconcentration maps. <br /> 14. Page 4-8, Item 4.3.4, Dissolved Petroleum Hydrocarbons, A-Zone <br /> Report: The southern downgradient limit of the dissolved petroleum hydrocarbons may <br /> extend beneath the Learner Lease scrap yard. Ground water may be impacted by the scrap <br /> yard operations. <br /> Comment: The Leamer Lease location is identified on page 2.2, Item 2.2.2, in the 1979 <br /> photo where a scrap metal yard is described as Area E. Item 2.2.3, which describes the 1992 <br /> photo says in part that the scrap metal yard south of the terminals still exists. Based on these <br /> photos and descriptions which identify Learner Lease as south (downgradient) of the terminals, <br /> and ground water results which show nondetectable concentrations of petroleum hydrocarbons <br /> in downgradient MWs UP/MW-1, PS/WC-4,S,M, and PS/MW-17, Learner Lease does not <br /> appear to be a contributor to the STTC plume. <br /> 15. Page 4-10, Item 4.3.4, Dissolved Petroleum Hydrocarbons, B-Zone <br /> Report: MW PS/MW-2M has been inaccessible since the third quarter. <br />