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4: <br /> 6. Disconnect the drain lines from the well, pressure wash the drains and lines, fill <br /> them with grout or cement, and permanently seal them. All waste associated with <br /> cleaning the drains and lines should be disposed of' in accordance with federal, state, and <br /> local regulations. <br /> 7. Observe the following closure requirements for septic tanks and wells: <br /> Case A: Septic system accepting industrial and sanitary wastewater into a common <br /> septic tank and drainfield or leachfield. <br /> T <br /> The septic tank should have the contents removed and disposed of appropriately. If a <br /> P P <br /> visual inspection of the tank indicates cracks or leaks, the tank and any visibly or <br /> potentially contaminated soil in the vicinity should be removed and disposed of <br /> #_ appropriately. Soil samples should be taken belowthe bottom of the tank excavation in <br /> f the manner described in "Sampling Methods and P ocedures" under "Sample Collection" <br /> and analyzed by a certified analytical laboratory. If the tank does not have any cracks or <br /> leaks, soil samples may be taken at either end of the tank at a depth that is at least as <br /> deep as the bottom of the tank. The tank may then be used for sanitary waste only, and <br /> the drain pipes leading from the restrooms need not be disconnected. Soil samples must <br /> also be taken along every twenty feet of drainfield or leachfield and sent to a certified <br /> W laboratory for analysis. It is recommended that soil samples be taken at other locations <br /> &46, <br /> . where there is a potential for a high degree of contamination (worst-case locations) such <br /> as elbows and joints in pipe lines, floor drains and clarifiers. All soil samples should be <br /> analyzed according to the methods in "Sampling Methods and Procedures" under <br /> "Sample Analysis". M addition, at least two soil sarnples, taken at the worst-case location <br /> around either the tank or drainfield, must he both analyzed for total concentrations and <br /> w in accordance with the methods or the T <br /> � <br /> prepared f oxicity Characteristic Leaching Procedure <br /> (TCLP) in 40 CER, Part 261 Appendix II as amended June 29, 1990. See Figures A-1 <br /> and A-2 for required and recommended soil sample locations. <br /> ua:f. <br /> .uk�t <br /> Case B: Septic system accepting only industrial wastewater into a septic tank and <br /> F <br /> drainfield or leachfield. <br /> y . The septic tank and the contents should be removed and disposed.of appropriately. An <br /> P PY <br /> visibly or potentially contaminated soil in the vicinity of the tank should be removed and <br /> disposed of appropriately. Soil samples should be taken below the bottom of the tank. <br /> excavation in the manner described in "Sampling Methods and Procedures" under <br /> "Sample Collection" and analyzed by a certified analytical laboratory. Soil samples must <br /> also be taken along every twenty feet of drainfield or leachfield. It is recommended that <br /> soil samples be taken at other suspected worst-case locations such as elbows and joints in <br /> - pipe lines, floor drains and clarifiers. All soil samp es should be analyzed according to <br /> the methods in "Sampling Methods and Procedures'. In addition, at least two soil <br /> k samples, taken at the worst-case location around either the tank or drain Id, must be both <br /> analyzed for total concentrations and prepared in accordance with the methods for the <br /> 8 <br />