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<br />B&B Excavating, /nc. -Montgomery Grave! Pit Stormwater Management Plan <br /> <br /> <br /> <br /> <br /> <br />Page 4 <br />B.. MATFRi:At C MANAGEMIIVT PRACTICES ::. <br />1. All materials are handed in accordance with Occupational Safety & Health <br />Administration (OSHA) requirements and/or manufacturers instructions. <br />2. Petroleum products aze stored in bermed azeas. If drip pans are used, they are cleaned <br />on a regular basis. <br />3. The amount of fuel stored on-site will be reasonable to support daily operations. <br />Redundant or unnecessary tanks will be removed from the site. Empty tanks and drums <br />will be refilled or disposed of properly. <br />4. Waste oil will be beneficially used as burner fuel at the B&B asphalt plant located near <br />Edwazds, Colorado. The waste oil will be burned to generate heat for the processing of <br />asphalt. The use of waste oil for heat energy is performed in compliance with air <br />pollution emission standards by filtering the exhaust air through an efficient bag house <br />filtration system. <br /> <br />1 <br /> <br /> <br />C.:. ' HISTORY OF SPII.LS AND SPECIFIC: LEAKS. OF TOXIC:. <br />OR HAZARDOUS SUBSTANCES <br />No spills or leaks of toxic or hazardous substances have been reported to have occurred on the <br />site. <br />., .. <br />•:•:..: . <br />D...::.:: BASIN DESCRIPTIONS FOR AREAS. OF INDUSTRIAI:: ACTIVITY.; .::.::' <br />Offsite Sources <br />Three potential off-site stormwater sources exist: (1) Eagle River, (2) Skillman Gulch, <br />and (3) the CKP Ditch. According to FEMA floodplain maps, the Fagle River 100-year <br />floodplain boundaries do not encroach operation areas in Basins A and B. Skillman <br />Gulch is an ephemeral stream with a 100-year flood flow rate of approximately 50 cfs. <br />The 100-yeaz depth of flow in Skillman Gulch is estimated to be about 1.5 feet and, <br />therefore, would not breach the 3-foot high berm required by a Special Use Permit to be <br />placed at the 6,460-foot contour. It is important that the berm extending up Skillman <br />Gulch be maintained to avoid the possibility of Skillman Gulch water mixing with on-site <br />water. This will likely require periodic regrading where vehicles travel to cross the <br />channel. <br />