SITE INFORMATION AND CORRESPONDENCE

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TOuc'ty Characteristic Leaching Procedure (TCLP) in 40 CF-R Pmt 261 Appendix II as amtended June 29, 199a The excavated area should then be backfilled with clean suitable fill material. See Figures B-1 and B-2 for required and recommended soil sample locations. Case C: Drywells, cesspools or drainage wells accepting industrial and sanitary wastewaters, or only industrial wastewaters. The contents of the drywell, cesspool or drainage well (identified hereafter as "well") should be removed and disposed of appropriately. It is required that the well casing be removed if it is practicable. Any visibly or potentially contaminated soil underlying the contents of the well should be removed. Soil samples should be taken in the center of the bottom of the well in the manner described in "Sampling Methods and Procedures" under "Sample Collection" and analyzed by a certified analytical laboratory. If taking samples from the bottom of the well is not feasible, samples should be taken on opposite sides of the well, at a distance not to exceed one foot away from the borehole, and starting at a depth that is equivalent to the depth of the bottom of the well. It is recommended that soil samples be taken at other suspected worst-case locations such as elbows and joints in pipe lines, floor drains and clarifiers. All soil samples should be analyzed according to the methods in "Sampling Methods and Procedures". In addition, at least two soil sample; taken at the worst-case location, mast be both analyzed for total concenbaliors and prepared in accordance with the methods for the Toxicity Chmnderistic Leaching Procedure (TCLP) in 40 CRR Pmt 261 Appendix II as amended June 29, 1990. The remaining hole where the well has been removed should then be filled with grout and sealed with asphalt or cement. See Figures C-1 and C-2 for required and recommended soil sample locations. Case D: Leachrield/infiltration gallery accepting sanitary and industrial wastewaters, or only industrial wastewaters. The practice of disposing sanitary and/or industrial wastewaters directly to a leachfield/filtration gallery without the use of a septic tank is unacceptable. The leachfield should be excavated, and all visibly or potentially contaminated soils removed and disposed of appropriately. Soil samples must be taken along every twenty feet of drainfield or leachfield in the manner described in "Sampling Methods and Procedures" under "Sample Collection" and sent to a certified laboratory for analysis. It is recommended that soil samples be taken at other suspected worst-case locations such as elbows and joints in pipe lines, floor drains and clarifiers. All soil samples should be analyzed according to the methods in "Sampling Methods and Procedures". In additiory at least two soil sanpleA taken at the worst-case locations in the droinfield or leachfneld, must be both analyzed for total concentrations and prepared in accordance with the methods for the Taxi* Chmnaffistic Leachb><q Procedure (TCLP) in 40 C_RR Pmt 261 Appendix If as amended June 29, 1990. The area should be regraded using clean fill. See Figures D-1 and D-2 for required and recommended soil sample locations. 9