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U <br />• Standard Methods for the Examination of Water and Waste - <br />(American Public Health Association et al., <br />16th edition, 1985) <br />• Test Methods for Evaluation of Solid Waste: Ph i a]_[ <br />Chemical Methods (U.S. EPA, EPA SW -846, 3rd edition, <br />November 1986) <br />Specific procedures and techniques for sample collection, sample pres- <br />ervation and shipment, analytical procedures, and chain -of -custody <br />control are presented in Appendix A. <br />B. PROCEDURES FOR EVALUATING GROUND -WATER MONITORING DATA <br />Section 2556(x)(4) of Subchapter 15 requires quarterly determination <br />of velocity and flow direction of ground water under waste management <br />units. Ground -water level data collected during sampling events will <br />be analyzed quarterly and used to (1) prepare a ground -water contour <br />map, (2) determine the ground -water flow direction(s), and (3) esti- <br />mate the ground -water flow velocity. Ground -water flow velocity will <br />be calculated according to the equation: <br />V = Ki <br />n <br />Where v = Average ground -water velocity <br />K = Hydraulic conductivity <br />i = Hydraulic gradient <br />n = Porosity (0.20) <br />The hydraulic conductivity (K) of the aquifer was determined by con- <br />ducting a slug test in Well G-1. The porosity (n) of the aquifer <br />materials was assumed to be 0.20 based on values presented by the EPA <br />in its manual entitled Criteria for Identifyil3g Areas of Vulnerable <br />drogeology Under RCRA. Statutory Interpretive Guidance Manual, <br />Interim Final. Julv 1986. <br />PJ9 9390207.00D 16 <br />