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• Standard Methods for th Examination of Water and Waste <br /> Aalu (American Public Health Association et al . , <br /> 16th edition, 1985) <br /> • Test MgjbDLL5 for Evaluation of Solid Waste: Physical/ <br /> C emical M _thidt (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 EVALUATIN - <br /> G GROUND WATER MONITORING DATA <br /> Section 2556(a) (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 Iden .ifyina Areas of VLlnerabIje <br /> Hvdroaeoloav Under RCRA, atatutory Interpretive Guidance Manual <br /> Interim Final . July 1986. <br /> PJ9 9390207.00D 16 <br />