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like to know what these MDL's are in order to verify that the MDL is low <br />enough to be below the suitability level for each constituent. <br />5. Based on Division inspections, is all of the rock at the Paonia sewage lagoons <br />really sandstone? If it all is (or at least appears to be) that is fine. If, however, <br />there are other rock types, additional samples and analyses may be warranted. <br />The two most important analyses for determining whether a material is acid forming are <br />pyritic sulfur and acid base potential (ABP). Based on the reported results, there is no <br />pyritic sulfur (none detected) and the ABP is 62 tons CaC03/1,000 tons material. An <br />ABP greater than -5 tons CaC03/1,000 tons material is considered acceptable. In the case <br />of the sample from the Bowie No. 2 sandstone, there is a net neutralization potential (a <br />positive number for the ABP) which is acceptable. BRL also analyzed for other forms of <br />sulfur including sulfate, organic sulfur and total sulfur. All of these forms of sulfur have <br />a limited potential for forming acid mine drainage. In all three analyses (sulfate, organic <br />sulfur and total sulfur) there was none detected. Based on these analyses, the Division <br />can conclude that the sample from the sandstone material transported to the Paonia <br />Sewage lagoons is not acid forming. <br />The next consideration is whether the sandstone transported from the Bowie No. 2 Mine <br />vent shaft excavation is toxic. Potential toxicity is determined by analyzing for various <br />metals, pH and sodium absorption ratio (SAR). Below is a chart with these constituents, <br />their concentration in the sandstone sample and the suitable level for each constituent. <br />Constituent Concentration Suitable Level Units Determination <br /> <br />pH 8.2 5.5-8.5 Std Units OK <br />Elec. Conductivity 309 8,000 umhos/cm OK <br />Combustible Solids NDA <10 % OK <br />Saturation % 28.4 2580 % OK <br />SAR 1.06 0-10 NUB OK <br />Cadmium (Cd) NDA NLEc m k o OK <br />Copper Cu) 0.1 NLEc mg/kg OK <br />Arsenic (As) NDn 2.0 mg/kg OK <br />Boron B 0.045 5.0 mg/kg OK <br />Iron (Fe) 9.4 NLEc mg/kg OK <br />Lead Pb) 0.6 20 mg/kg OK <br />Manganese Mn) 2.49 60 mg/kg OK <br />Mercury (H) NDA 0.5 mg/kg OK <br />Molybdenum Mo NDn 1.0 mg/kg OK <br />Selenium (Se) NDn 0.1 mg/kg OK <br />Zinc (Zn) 0.4 NLEc mg/kg OK <br /> <br />A = None Detected - Detection Limit Not Given <br />B = No Units - This is a Dimensionless Value <br />C = No Limit Established <br />D = mg/kg = arts/million ( m)