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.. * ~, <br />COMMENTS FROM SCOTT G. MEFFORD <br />Ground Water Systems <br />1. [PanialJ It is unclear from t/re text if tl:e existing well M-9 is to be pump tested. <br />RESPONSE: As stated in JCHA's submittal for TR-08, "pump tests will be conducted at each <br />of three well sites (M-9 and the two new sites) to determine aquifer hydraulic <br />characteristics for input to a ground water model to evaluate what well <br />configuration and pumping rates will be necessary to control the ground water <br />gradient". BMR believes that it was clear in TR-08 that well M-9 would be <br />pump tested. <br />As confirmed in the second phase submittal for TR-08, a pump test was <br />conducted at M-9, and ttte results were reported in the August 6, 1992 submittal. <br />2. [Partial) [TJhere is no information in the docunrcrvs to suggest +vhat pumping <br />rates are being anticipated far the tests, or how long the tuts are to 6e <br />conducted. Short ternr "step tests" conducted on the rveAs prior to initiation of <br />1/re continuous discharge test would 6e helpfid in defining these pprmneters. (n <br />any event, tests should be of adequate duration and conducted at adequate <br />discharges [o allow a reasonable interpretation of aquifer pernteahility to be <br />developed within the full area benveen the three rvcllr, and to define any <br />boundary conditiotu wl:ic/t may exist. 77te tests s/rauld a/so bg o/' odegrtntc <br />durotion to overcome any delayed yield ef•[ects w/:ich may occur in the aquifer. <br />RESPONSE: As described in the August 6, 1992 second phase submittal for TR-d8, during the <br />development of each of the wells water level data were oblairred to evaluate the <br />best long-term pumping rate. While not a step test, it did provide t;uf6cient data <br />to allow evaluation of the appropriate pumping rate. <br />As described in 7CHA's first phase submittal for TR-08, it was proposed that the <br />two wells not being pumped during each pump test would be used as observation <br />wells to develop additional aquifer characteristics (storage coefficient). However, <br />due to the ]ow production rates and strict time schedule for re9portse to the <br />CDMG, observation wells were not used during these pump tests. 1$MR believes <br />that these tests have provided representative aquifer hydraulic characteristics and <br />that, because of the low permeability of the Sarrta Fe aquifer, steady-state <br />conditions will be achieved rapidly, making the value of the storage coefficient <br />a moot point. <br />-a- <br />