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3.0 TREATMENT/DISPOSAL GUIDELINES <br /> The treatment and disposal guidelines for these contaminated soils are provided by "Information <br /> Regarding the Management of Petroleum Contaminated Soil", CDPHE (February, 1996). <br /> 4.0 CONTAMINATED SOIL TREATMENT <br /> 4.1 Treatment Area Layout <br /> The treatment area layout is shown in the attached drawing titled "Deremo-Snyder Mine <br /> Group, Snyder Mine Plan View." <br /> The treatment area is located on the top of the recontoured mine spoils pile at the D-2 Mine <br /> site. The surface of the treatment area is mine waste, and is at least 15 f-et in depth. <br /> Beneath the mine waste pile is natural earthen material from approximately 0 to 5 feet thick <br /> underlain by Dakota formation bedrock. The depth to groundwater in this area is unknown. <br /> The closest water well has a static water level of 25 feet. <br /> The treatment area will be will be posted "PETROLEUM CONTAMINATED SOILS - NO <br /> SMOKING". <br /> Surface water diversion structures will be constructed as shown in drawing 1 to divert run- <br /> on away from the treatment area and to collect all run-off from the treatment area. <br /> Stormwater collected within the treatment facility exceeding 12 inches in depth will be <br /> pumped back onto the treatment area. <br /> 4.2 Treatment Process <br /> The contaminated soils will be moved to the treatment area using conventional <br /> earthmoving equipment. During the removal process, contaminated soils will be monitored <br /> visually and with a photo ionization detector. The removal of the contaminated soil from <br /> the spill site will be verified by sampling and analyses, as summarized in Table 1. <br /> The contaminated soils will be placed in the treatment area in a single lift not to exceed six <br /> (6) inches thick. Large rocks from the contaminated area will be stored either within the <br /> bermed area of the treatment facility or left in the excavation. <br /> After a minimum two-month weathering period during summer months, samples will be <br /> taken of the contaminated soil at a rate of at least one sample per quarter acre. The <br /> sampling frequency and analytical requirements during the time of treatment are <br /> summarized in Table 2. <br /> D-2PETROLEUM CONTAMINATED SOILS <br /> Page 2 <br />