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Case Number:
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BLD2009-00368
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Received Date:
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10/28/2009
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Description:
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Stormwater Permit with SEPA: The proposal is a 24.7-acre expansion of Miles Sand and Gravel Company's Shine Facility. The expansion is comprised of Reclamation Segments Z1 (10 acres), Z2 (10 acres) and Z3 (4.7 acres). Sand and gravel will be extracted from this new acreage and then conveyed to existing facilities for processing.
Native material will be utilized to finish ground slopes in preparation for reclamation. The cut and fill method will be used at this site. Final grades will have a 2.5:1 (40%) average slope at mining boundaries.
West Shine Creek, approximately 0.75 miles east and some 200-feet lower than the acreage proposed, flows into Squamish Harbor, which lies approximately 1 mile east of the proposed expansion area. Pheasant Lake is approximately 0.75 miles southwest of the proposed expansion, Mud Lake lies approximately 0.60 miles south of the proposed expansion and Twin Lakes is approximately 0.40 miles west of the proposed expansion.
Depending on market demands, mining operators and aggregate truck operators at the Shine Facility, process and haul sand and gravel upwards to 24 hours a day, 7 days per week. Noise is generated by mining and processing equipment (i.e. loaders, bulldozers, rock crushers, wash plants, conveyors and other equipment) and haul trucks. A study of the noise level generated by the Shine Facility operations and received by the neighboring properties was done in October 2002 (Environalysis 2002). A supplemental study was done in 2004 when a new rock crusher was added to the operation (Environalysis 2004). Both studies confirmed that the operations at the Shine Pit (including extraction) do not exceed the Washington State Department of Ecology Noise Standards as adopted by Jefferson County Unified Development Code (UD) during any time of the day, night or weekend. A 48-hour Noise Monitoring study was conducted from June 27-29, 2006 (Environalysis, 2006). This study re-confirmed acceptable noise levels within the pit and therefore, implicitly on Shine and South Point Roads. Moving to this proposed mining area will not create noise not already generated by existing operations. Because of the location and surrounding topography of the proposed mining area, what noise (if any) neighboring properties receive from current mining extraction activities will likely be lowered.
Miles is currently working under Department of Ecology (DOE) San and Gravel Permit No. WAG 50-1120. This stormwater report covers a further expansion to Miles' Department of Natural Resources (DNR) Reclamation Permit, as required by DOE. As of May 2000, permit coverage was extended to Ace Paving Company for an asphalt batch plant located adjacent to and subleased from Miles. Ace Paving Company has subsequently received a separate permit, WAG 50-1237. Both Ace Paving and Miles will continue to monitor discharges from the Ace Paving portion of the permitted site. Stormwater generated within the Ace Paving permit area is discharged to process water ponds for the mining operation and is ultimately discharged to the northerly infiltration pond where infiltration to groundwater occurs. Miles monitors all discharges to groundwater that result from mining operations. All Stormwater generated on-site is infiltrated to groundwater per the existing permit. No discharge to surface water is anticipated at this project location. Type 1 Stormwater, generated off-site to the west, is also infiltrated on-site. Type 2 Stormwater from the actively mined portion of the project is infiltrated within the excavation area. Grading in the active mining area prevents stormwater from leaving the site, allowing infiltration for the entire area of exposed soils within the excavation area. Type 2 Stormwater from stockpile areas is intercepted and directed to the infiltration areas. Stormwater quality enhancement treats Type 3 Stormwater from the impervious areas surrounding the operations facilities. A sedimentatio
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Issued Date:
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4/22/2010
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Case Status:
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F
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Expiration Date:
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4/22/2011
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Final Date:
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5/1/2017
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Permit Applicant:
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MILES SAND & GRAVEL CO
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Parcel No:
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721062001
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Case Notes:
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Building Type:
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SWT
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Water Supply:
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Existing:
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Main Fl:
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Type of Improvement:
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C&G
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Sewage Disposal:
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Proposed:
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Add Fl:
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Type of Construction:
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Total:
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Heated Basement:
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Units:
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Unheated Basement:
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Height:
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Other:
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Stories:
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Garage/Carport:
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Heat Type:
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Decks:
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Estimated Cost:
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Existing:
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ShBnkHt:
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LndBnkHt:
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Make:
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Proposed:
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ShSetBk:
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LndSetBk:
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Yr:
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Total:
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Size:
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