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Cross Gold Mine <br />December 2024 G2-2 <br /> <br /> <br /> <br />Table 1. Ore Parameters <br />Parameter Lowest CDPHE Groundwater Limit <br />(mg/L) <br />Arsenic, dissolved 0.01 <br />Cadmium, dissolved 0.005 <br />Conductivity N/A <br />Copper, dissolved 0.05 <br />Fluoride 2 <br />Iron, dissolved 0.3 <br />Lead, dissolved 0.05 <br />Manganese, dissolved 0.05 <br />Mercury, dissolved 0.002 <br />Nickel, dissolved 0.1 <br />Nitrate/Nitrite as N 10 <br />pH 6-9 <br />Total Dissolved Solids (TDS) 1800 <br />Sulfate 250 <br />Vanadium, dissolved 0.1 <br />Zinc, dissolved 2 <br />Acid-Base Accounting (ore only) N/A <br />3. Ore and Tailings Sampling Protocol <br />EPA soil sampling procedures, as outline below, will be followed for ore: <br />• A clean pair of new, non-powdered, disposable gloves will be worn each time a different location <br />is sampled, and the gloves should be donned immediately prior to sampling. The gloves should <br />not contact the media being sampled and should be changed any time during sample collection <br />when their cleanliness is compromised. <br />• Special care must be taken not to contaminate samples. This includes storing samples in a <br />secure location to preclude conditions which could alter the properties of the sample. <br />• Samples shall be custody sealed during long-term storage or shipment. <br />• Always sample from the anticipated cleanest, i.e., least contaminated location, to the most <br />contaminated location. This minimizes the opportunity for cross-contamination to occur during <br />sampling. <br />• Collected samples must remain in the custody of the sampler or sample custodian until the <br />samples are relinquished to another party. <br />• If samples are transported by the sampler, they will remain in his/her custody or be secured until <br />they are relinquished. <br />• Shipped samples shall conform to all U.S. Department of Transportation (DOT) rules of <br />shipment found in Title 49 of the Code of Federal Regulations (49 CFR parts 171 to 179), and/or <br />International Air Transportation Association (IATA) hazardous materials shipping requirements <br />found in the current edition of IATA’s Dangerous Goods Regulations. <br />• Documentation of field sampling is done in a bound logbook.