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<br /> <br />and sedimentation from areas bordering the mining zone. <br />4 <br />5 <br />Methods of Stormwater Collection and Discharge <br />No paved surfaces are found at the site. Stormwater <br />which does not soak into the porous gravel surface of the <br />mining and stockpile area drains across the working area <br />from South to North into tfie main drainage ditch running <br />along the highway ROW. The ditch is also located in <br />course gravel which allows some storniwater t_o seep into <br />the material underlying the ditch. <br />Just above the culvert drain pipe at the intersection of <br />US 50 and CR 37, a sediment control structure is planned. <br />This structure is intended to detain sediment which may <br />be carried along the main drainage ditch during <br />infrequent intense rainfall. The strucr_uT'e will be a <br />minimum of 1000 sq ft in surface area with a 4' berm <br />stabilized with river rock to allow a slowing of runoff <br />velocities along the main drainage ditch before entering <br />tt~e culvert and 'flowing tf~e final 500' distance to the <br />Sand Gulch drainage. <br />Fugitive Dust <br />Fugitive dust caused by crushing and screening operations <br />is controlled as described in the individual Air <br />Pollution and Fugitive Dust Control Plan for that <br />particular Mobile Crushing grid Screening Plant, including <br />the use of water truck operation to dampen all roadways <br />and work areas to minimize fugitive emissions due to <br />truck and loader traffic. <br />Under normal pit operating conditions, minimal fugitive <br />dust controls are necessary due to the relatively course <br />particle sizes handled and limited truck traffic. <br />6. Vehicle Service and Cleaning Areas <br />At the present time, no major service or repair <br />maintenance is performed on the property. No <br />steamcleaning or equipment washdown is performed. <br />There are plans for a maintenance shop to be constructed <br />in the area directly South of the scales and past of CR <br />37 sometime in 1995 ar 1596. Where constructed, the <br />facility will include handstand and catchment for <br />equipment washdown and liquid materials handling, oil; <br />water separator insr_alled in shop floor drainage system, <br />and sanitary septic system in operation meeting all <br />applicable local regulations. Roof and gutr_er drains <br />will flow into the Sand Gulch drainage via an appropriate <br />sediment control structure. <br />-6- <br />