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SEP -27 -1999 14:25 JOYCE ENGINEERING INC. 1 336 323'0093 P.03/04 <br />Envirorunental Service Companies and Consultants <br />October 6, 1995 <br />past <br />Please be advised that :slug:ta4 generally underesti=te-hydraulic conductivity. Therefore, <br />it is reconuncnded that soil/sedimgnt.-•samples. be colleetia from the saturated zone from the most <br />transmissive layers in which the weft are-screened and that these sarnples.be analyzed for grain size <br />distribution. Hydraulic conductivity a say;be.calculated from the =grain size distribution data using an <br />appropriate method [e.g., IWO (1911), March and Dewy (1966) or Sherard. Dunningan and ralbot <br />(1984)]. The slug test values should .then be compared to the grain size analysis hydraulic <br />conductivity values as well as topubhshed lrydraulie conductivity values for the specific soil/sedirnent <br />type, additionally. to detcrmiite the variability in hydraulic conductivity at a site, slug ?ests should <br />be performed is monitoring wells located in strata likely to exhibit differing hydrogeologic properties, <br />(The DEM will currently reimburse up to $1,500.00 for implernwtadon. of 0 necessary slug tests at <br />a site.) For purposes of modeling groundwater flow, the greatest hydraulic conductivity values <br />should then be used to ensure conservative model output <br />Y would h1ce to take this opportunity to'stress that the-DEM will not reimburse for slug tests <br />or any other aquifer tests that are-performed improperly. -If you have any questions or would like <br />further information concerning dug-tests, please contact Ruth Strauss at (519). 733.1330. <br />Sincerely, <br />Arthur Mouberry, P.E. <br />Chief, Groundwater Section <br />cc: Regional Mace Groundwater Supervisors <br />Burrie Boshoff <br />Bill Reid <br />George MatWs f <br />Ruth Strauss <br />