2026-01-21_REPORT - M1981043 (4)

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Glossary Condition of No Exposure: all industrial materials or activities are protected by a storm -resistant shelter to prevent exposure to rain, snow, snowmelt, andlor runoff. Industrial materials include: machinery, open containers, raw materials, intermediate products, by-products, final products or waste products. Final products may be stored outside without being considered to be exposed IF they would not be mobilized by stormwater discharge. (For example, rock salt or fine sediment would be mobilized, and so must be covered.) Grab Sample: A single "dip and take" sample that is re resentative of the water being monitored. However, the sample bottle must be full. Since Selenium samples are acidified, you do NOT want to dip with the actual sample bottles. Use the "scooper" bottle to dip and take, You may need to dip more than once if one dip does not fill the sample bottle. Inactive mining operations— Regulation 61.3(2)(e)(iii)(C) identifies that "inactive mining operations" are mining sites that are not being actively mined, but which have an identifiable owner/operator; inactive mining sites do not include sites where mining claims are being maintained prior to disturbances associated with the extraction, beneficiation, or processing of mined materials, nor sites where minimal activities are undertaken for the sole purpose of maintaining a mining claim). This term includes the following types of facilities that have an identifiable ownerloperator: • mineral mining and/or milling occurred in the past but is not covered by an active mining permit issued by DRMS; • operations are limited seasonally (i.e., intermittent operations), consistent with DRMS requirements for notification, only during the portion of the year when the facility is not active; or • operations cease for 180-days or more for reasons not associated with intermittent status, and still has reserves (consistent with temporary cessation status as defined by DRMS), only during the time period the facility is not active; or • exploration or extraction activities have ceased permanently. certification required for SWMP for Inactive and unstaffed facilities Permittee Signature: Title: Date: I certify under penalty of law that this site meets the conditions Inactive Mining Operations and is unstaffed. I am aware that there are significant penalties for providing false information, including the possibility of fine and imprisonment for knowing violations. Measurable Storm Event: A storm event that results in an actual discharge from the facility. storm event that results in an actual discharge from the facility ("measurable storm event"), which includes discharges to surface water within the facility permit boundary, and that follows the preceding measurable storm event by at least 72 hours (3 days). Monitoring Point: Samples and measurements taken for the respective identified monitoring points required in the permit certification shall be representative of the volume and nature of the wastestream and/or effluent. Monitoring points shall be so designed or modified so that a sample of the effluent can be obtained at a point after the final treatment process and prior to discharge to state waters. All samples shall be taken at the monitoring points specified in the permit certification and, when specified, before the effluent joins or is diluted by any other wastestream, body of water, or substance. Monitoring points shall not be changed without a modification request submitted to and approval by the Division. Monitoring Method: The permittee must select a test procedure that is "sufficiently sensitive" for all monitoring conducted in accordance with this permit. For COG502012, the required sensitivity is 1 uglL (or 1 ppb). Runoff Event: for a rain event means during, or within 24 hours after the end of, a measurable storm event; and for a snowmelt event, means at a time when a measurable discharge occurs from the facility. SWMP Administrator: individual(s) by name or by title whose responsibilities include: SWMP development, implementation, maintenance, and modification, CDPHE Web Page: htts:l/www.colorado. ovl acific/cd he/w cd-sand-and- ravel- eneral- ermit-renewal-meetin -notice Contacts with CDPHE: All Stafford 303-6914021 Maura McGovern 303-692-3392 Page 5 of 5