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n <br />B&B Ecrnvnting, /nc. -Montgomery Grave! Pit Statmwater Management Plan <br /> <br />I <br /> <br /> <br /> <br /> <br />1 <br /> <br />1 <br /> <br />Page 6 <br /> <br />A summary of the industrial activity and drainage characteristics for the two basins is <br />presented below: <br />Ba. in it <br />A <br />15.0 Acres <br />B <br />E:.'::SiJ&IlbIARY'OF,ERISTING DISCHARGE SAMPLING DATA <br />25.4 Acres <br />Description of Activity <br />Sand and gravel mining <br />and crushing operations. <br />Processed aggregate is <br />stockpiled. Above ground <br />storage tanks are located <br />within Basin A and are <br />contained within individual <br />bermed enclosures. <br />Stockpiling of processed <br />aggregate. Concrete is <br />batched and loaded in miter <br />trucks. Asphalt is mixed and <br />loaded into trucks. Undis- <br />turbed areas to the east are <br />used for horse pasture. <br />Drainage Characteristics <br />Drains northerly but <br />contained by a berm <br />constructed at elevation <br />contour 6460 between <br />operations and the Eagle <br />River. The berm also extends <br />along Skillman Gulch to <br />isolate site stormwater <br />runoff from the Gulch. <br />Similar to Basin A. <br />Drains northerly but <br />contained by a berm <br />constructed at elevation <br />contour 6460 between <br />operations and the Eagle <br />River. The berm extends <br />along Skillman Gulch to <br />isolate site stormwater <br />runoff from the Gulch. <br />No data has been obtained to date. <br />F :::::bESCR1PTIOPF'OF PROPOSED SAMPLING P(3INT5.. <br />A perimeter berm is constructed and maintained to capture stormwater runoff and to isolate <br />stormwater from process water. For most years, no surface water discharge is anticipated. As <br />described in Section D, a berm will be constructed around ponds containing process water to <br />prevent commingling with stormwater. <br />