4.6 PCSR 01-14-2014 - Laserfiche WebLink

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January 10,2014 Page 5 of 8 Other materials that are not considered hazardous but may be expected to be onsite during operations include engine oil, grease,hydraulic fluid,anti-freeze, diesel fuel and generator(s). The vx p0X materials will be stored in an elevated,portable trailer in compliance with state requirements and c‘,, d/ regulations. Due to the portable nature of the trailer,the location of the trailer is subject to change throughout the duration of the project and therefore, a location is not indicated on Sheet C2, Excavation Plan. The trailer contains a spill contain kit consisting of sorbent pads, containment booms and other sorbent materials such as floor dry. Front end loaders and skid steer loaders are available onsite to excavate any contaminated soils. Fueling occurs from the AST located in the secondary containment for equipment associated with the hot mix asphalt plant. Equipment associated with sand and gravel mining and processing is fueled by fuel service trucks. The location of the fuel service truck is subject to change on a daily basis and therefore,a location is not indicated on Sheet C2,Excavation Plan. The fuel service trucks contain spill containment kits. In some instances equipment i sf ueled from portable ot�" 1 tanks brought to the site with the portable processing equipment. The portable tanks are all double 1 walled and will be located very near the portable trailer mentioned above which contain a spill containment kit. i \. (9)Plans for drainage, wind and water erosion control, sedimentation and dust control, °(, maintenance of security on the proposed extraction site, control of access to open extraction and control of weeds and unsightly vegetation. Comment: The information is provided on page 7 of the application. The applicant should identib, contingency procedures for mechanical sweeping in the event that sediment removal on public roadways is deemed appropriate by the City of Elk River. The applicant must provide a more detailed plan which identifies the placement of control measures for water runoff and sediment erosion for all areas which do not drain to the interior settling ponds. This must include description of control measures and locations where they are placed. Appropriate control measures are temporary vegetative seeding, mulch, buffer zones, earthen dikes, drainage swales, sediment traps, riprap, sediment basins and silt fencing. Response: During facility operations,the site is routinely watered to keep dust down.The facility's impervious areas(access driveway)are swept weekly by a company-owned sweeper truck. The roadway areas adjacent to the entrances/exits are also swept weekly to aid in reduction of tracking material off site by truck traffic. When weather and/or hauling conditions are such that tracking onto roadways is induced,entrances/exits and roadways are swept more frequently as needed. Stonnwater generated from the facility is authorized under National Pollutant Elimination System (NPDES)/State Disposal System(SDS)General Permit MNG490000 for Nonmetallic Mining and Associated Activities issued by the MN Pollution Control Agency. The facility operates under a Spill Prevention Control and Countermeasure Plan as well as a Stormwater Pollution Prevention Plan. All stonnwater runoff from disturbed or exposed soils are directed internally and is contained onsite.As areas are stripped and incorporated into the active mining operations,diversion berms and ditches or swales will be constructed as necessary to divert stormwater internally into the floor