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Drainage Plan for Rtz Industrial

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Drainage Plan for Rtz Industrial DRAINAGE PLAN FOR RTZ INDUSTRIAL, LLC Prepared by: Zancanella & Associates, Inc. 1011 Grand Avenue Glenwood Springs, CO 81601 (970) 945-5700 (970) 945-1253 - fax November 2008 TABLE OF CONTENTS SECTION PAGE INTRODUCTION 1 MAJOR BASINS 2 OFF-SITE BASINS 2 IRRIGATION DITCHES 2 HYDROLOGY 3 ONSITE DRAINAGE 3 EROSION CONTROL 3 SUMMARY 4 FIGURE 1 Project Location Map (8 1/2" x 11 ") 2 SCS Soils Map w/ Drainage Basins (11" x 17") 3 Drainage Basin Map (11" x 17") 4 Drainage Plan (11" x 17") 5 NOAA Atlas 25 Year (24 hr.) Precip 6 NOAA Atlas 100 Year (24 hr.) Precip. TABLE: Hydrology Summary Table APPENDIX A: Calculations APPENDIXB: Soil Information APPENDIXC: Mining Plan APPENDIX D: Reclamation Plan APPENDIX E: Stormwater Management Plan APPENDIX F: National Pollution Discharge Elimination System 1 INTRODUCTION The proposed RTZ Industrial, LLC is located along the southerly side of Interstate 70 approximately 7.5 miles easterly of the DeBeque interchange. See Project Location Map, Figure 1. The property is a gently sloping, triangle-shaped tract of some 103 acres that is bounded on the north by Interstate Highway 70, the Union Pacific Railroad and State Highway 6 and 24. On the east side of the property is County Road 300, across which is a currently operating sand and gravel operation. To the southwest of the proposed operation is the Colorado River. The proposed site has received some limited sand and gravel extraction in the past and was permitted as the L.G. Everist Pit. The property is generally at an elevation of 5000 feet above sea level. Although the site development has been divided into three phases, reclamation will occur more or less continuously as mining is completed. This will accomplish three main goals: 1. Begins reclamation on any one area as early as is practical 2. Reduces potential for fugitive dust emissions 3. Reduces material handling costs As overburden and topsoil are removed for mining from one area they can be placed in areas that are being reclaimed, reducing the need for material stockpiles. The proposed operation is intended to mine, crush and screen sand and gravel from the alluvial materials adjacent to the Colorado River. The operation will process approximately 150,000 tons of material per year, a portion of which will be sold and hauled offsite. Depending on the market for the products sold, the operation will have and expected life of ten years. As sand and gravel pits normally go, this operation will be a relatively small one. There will be no asphalt or concrete mixing operations involved. Excavators, front-end loaders, strippers and off-road haul vehicles will be the primary means of mining and moving materials to and from the crushing and screening plants. The specific types and capacities of the equipment are provided in the Emissions Permit. Although the mining plan divides the site into three phases, reclamation will occur continuously as mining is completed. This will accomplish five main goals: Begins reclamation on any one area as early as is practical to do so, Reduces visual impacts of the mining operations, Reduces potential for fugitive dust emissions, Reduces material handling costs, and Increases the potential for reduced bonding requirements. As overburden and topsoil are removed for mining from one area they can be placed in areas that are being reclaimed, reducing the need for material stockpiles. The reclamation will include two ponds as a water feature and residential lots. Mining and Reclamation plans are included as Appendices C and D, respectively. The adjacent land uses are primarily industrial and transportation related uses. A sand and gravel operation similar to the proposed RTZ operation is currently in operation on the east side of the RTZ tract. Highways, railroad tracks and industrial storage/staging area for gas development border the property to the north. It is believed that the proposed land use will not significantly impact those adjacent areas. The south side of the property is bordered by the Colorado River. A 200 foot wide buffer zone along the river has been built into the mining plan so that there will be no visual impact from river level. The north side of the property is bordered by the Railroad and has a 200 foot offset from the pit boundary to the Railroad Right of Way. Appendix E is a Stormwater Management Plan which addresses the Construction Dewatering Plan, Stormwater Runoff Plan, Best Management Practices ang Materials Handling and Spill Prevention details how potential pollutants will be kept from entering state waters. In addition, Appendix F contains the NPDES permit which further specifies how water pollution will be prevented at the RTZ site. MAJOR BASINS: The property is affected by the 100 year floodplain of the Colorado River as established by the Corps of Engineers. The floodplain and floodway, as determined by the Corps of Engineers drawings dated December 1982, and found on the Garfield County website, are shown on Figure 4, Floodplain Map. OFFSITE DRAINAGE BASINS The three drainage basins shown on Figure 2, Basin Map, could affect the site. Basin A crosses the interstate and the railroad to enter the site near the westerly end. The existing channel for that basin is being preserved and thus the runoff from Basing A will be routed through the site and on to the Colorado River. The other two basins, B & C, also cross under the interstate and the railroad, but follow a route that cuts across the extreme northeast corner of the site and then continues southeasterly on to the river. No on-site culverts are necessary, so calculations showing the channel size necessary to convey the 100 year flow are enclosed in the calculations appendix. The runoff calculations for each basin are also included in the appendix. IRRIGATION DITCHES No irrigation ditches affect this property. HYDROLOGY The hydrologic methods for the minor basins in this study are as outlined in the Soil Conservation Service publication "Procedures for Determining Peak Flows in Colorado" (1980). Peak flows in this area will be primarily rainfall derived since the whole site as well as most of the offsite basin are below 8000 feet in elevation. Therefore, the storm drainage system will be more than adequate to handle spring snowmelt runoff, as it typically has much lower peaks, even though of longer duration. The precipitation amounts for the 25 and 100 year, 24 hour storms were taken from the NOAA Atlas 2, Volume 4, published by the National Weather Bureau (copies with the site location plotted are included in the Calculations Appendix). Runoff calculations are included in the Appendix, and a summary table of the results is provided at the end of this text. The hydrologic characteristics were based on information from the Soil Survey of Rifle, Colorado with parts of Garfield and Mesa Counties. The typical Hydrologic Soil Group was "D" for Basins A, and Basin B. A general Curve Number of 89 was used for Range Ground in Poor Condition. ON SITE DRAINAGE On site drainage patterns are shown on Figure 4, the Drainage Plan. The estimated flows that could affect the proposed residential lots are minor and will be short lived as well as diffuse. Since the flows will be relatively shallow and diffuse, the possible damage to buildings can be mitigated with a proper site grading plan. This could be no more elaborate than a berm or benn/ditch combination on the uphill side of each building, or across the top of the whole building envelope, or by elevating the finished floor sufficiently to allow flow away from the building in all directions. Note that the existing and proposed building sites are amply spaced to allow storm runoff flows to be diverted around each site without significantly affecting adjoining sites. Detention is not proposed for this development because the runoff can be conveyed directly to the river without affecting any other properties. EROSION CONTROL See NPDES permit for information on erosion control. The plan and details of that plan are included as an attachment to the general application. Proper drainage of Basin A will require that the existing 9'x12' and 8'x8' box culverts on the Northwest edge of the subject parcel be properly maintained and undisturbed by the mine plan construction. The project dewatering pond will discharge to the unnamed drainage as illustrated in the Stormwater management plan. Drainage of Basin B will be maintained by the usage of the existing drainage ditch on the eastern boundary of the subject parcel. An existing 48 inch CMP diverts runoff from Basin B into an open ditch across the subject parcel. This open ditch will be maintained for the duration of the project. See the attached Figure 4 for specific site details. SUMMARY Impacts to proposed building areas due to on and off site runoff can be mitigated by routing flows through the site with reasonable care. Additional storm runoff generated from the development of the RTZ Industrial, LLC will be insignificant due to the large lot areas and small impervious areas in relation to the lot size. .... 0.. (;r <t: ,)5 Z""' w ~ Ji " ::iE w «< z ili Q 0 i= <t: 0 0 _J t- 0 w....., 0 0:: 0.. •• H i~ ~. <a: ~~ 0:: (/) Q .. I iN ~ ..... <I(~ (.) ~ VI 0 cs i I FIGURE NO. FLOODPLAIN AND FLOODWAY RTZ Grovel Pit DELI NEATION PLAN SHEET: :SOf-4 DRAWIN G: 3 .dwg PROJECT: 26419 N ! I ! { ·•\ '\. \ .\ ·..., .... DRAINAGE SITE PLAN RTZ Gravel Pit 4 APPENDIX A: CALCULATIONS RTZ INDUSTRIAL HYDROLOGY SUMMARY TABLE ~ AREA CURVE NO. TiC E-!l5 YR Q-25 VB P-100 YR Q-100 YR (acres) (hours) (inches) (cfs) (Inches) (cfs) A !50 88 0.34 2.2 166 2.7 232 8 140 88 0.34 2.2 156 2.7 218 EFH-2 ESTIMATING RUNOFF AND PEAK DISCHARGE Version 1.1.0 Client: RTZ Industrial County: Garfield State: CO Practice: Z & A Calculated By: tpb Date: 3/12/2008 Checked By: ____ Date: _____ Drainage Area: 150 Acres (provided from RCN Calculator) Curve Number: 88 (provided from RCN Calculator) Watershed Length: 5280 Feet Watershed Slope: 20 Percent Time of Concentration: 0.34 Hours (calculated value) Rainfall Type: II .
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