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Jim Pinasco <br /> Page 6 <br /> August 1, 1989 <br /> Comment 10 <br /> The proposed monitoring well LM 81 should be screened at a <br /> depth similar to the screened interval (or stratigraphic <br /> horizon) of LM 56. This screened interval is recommended to <br /> aid in defining the lateral extent of contamination detected in <br /> LM 56 . <br /> Comment 11 <br /> On page 2-14 and 2-15, paragraph 2 .4.3 , the Draft RI/FS states: <br /> "Shallow soil samples were taken in the unsaturated zone <br /> above the water table for two purposes: to search for <br /> contaminated soils which may require remediation on their <br /> own, and to search for contaminated soils which may serve <br /> as sources to the groundwater. A total of 90 soil borings <br /> were made, with each sampled at 9 to 10 feet and 13 to 14 <br /> feet depths. . . Generally the results were spotty, <br /> reflecting the relatively high detection limit in soil <br /> data, 50 ug/kg. " <br /> Clarification is requested as to whether on-base contaminated <br /> soils are expected to continue releasing hazardous chemicals <br /> into groundwater. - <br /> Comment 12 <br /> TSSU requests clarification as to why the 1986 aquifer analysis <br /> used the Boulton method for unconfined aquifers, while the 1989 <br /> test used the Hantush leaky aquifer method. <br /> OTHER CONCERNS <br /> Comment 13 <br /> On page 3-16, paragraphs 3 . 6. 2 . 1 and 3 . 6 . 2 .2 , reference is made <br /> to the "Old River. " TSSU requests clarification as to the <br /> definition of the Old River. <br /> Comment 14 <br /> Regarding Table 3 . 6-1, Summary of Borehole Hydraulics Test <br /> Results, TSSU has the following remarks: <br />