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HomeMy WebLinkAboutWARD ALTERNATIVE ENERGY - PDP - PDP160002 - SUBMITTAL DOCUMENTS - ROUND 1 - EROSION CONTROL LETTER/REPORT (3)Sediment and Erosion Control Report For Ward Alternative Energy Fort Collins, Colorado Prepared for: Ward Alternative Energy, LLC c/o Paul Nelson 5660 E. 58th Avenue Commerce City, CO 80022 Prepared by: 908 Laporte Avenue Fort Collins, CO 80521 (970) 219-2834 January 13, 2016 1 SECTION 1 - RESPONSIBLE PARTIES AND CONTACT INFORMATION Project/Site Information Project/Site Name: Ward Alternative Energy Project Street/Location: 614 East Vine Drive, Fort Collins, Colorado Latitude: 40° 35.777'N Longitude: 105° 4.060'W Owner/Developer: Civil Engineer: Ward Alternative Energy, LLC Apex Engineering 5660 E. 58th Avenue 908 Laporte Avenue Commerce City, CO 80022 Fort Collins, CO 80521 (720) 941-2791 (970) 219-2834 Contractor and SWMP Administrator: Company Name: Company Address: Company Telephone: Project Manager/Cell: Site Supervisor/Cell: Emergency SWPPP Contact/Cell: 2 SECTION 2 - EXISTING CONDITIONS AND SITE INFORMATION Nature and Sequence of Construction Activity The proposed land development project is a natural gas fueling station consisting of 5 fuel islands with canopy covers and a masonry enclosure on a 1.07 acre lot. The project includes removal of an existing metal building and asphalt paving, minor storm drainage, utilities and site improvements such as parking areas, drive aisles, hardscape and landscaping. The project will be constructed in one phase, and is expected to have a duration of approximately 6 months. A detailed sequence of construction and preliminary schedule is included in the appendix.  Estimated Project Start Date: 06/2016  Estimated Project Completion Date: 12/2016 Soils, Slopes, Vegetation and Drainage Patterns The existing surface soils on-site consist of Nunn Clay Loam. These soils are typically set in terraces. These soils are well-drained, with parent material comprised of mixed alluvium and/or eolian deposits. Slopes on the site average 0.5%, falling generally northeast to southwest. Existing vegetative cover consists of native plants and weeds. Existing vegetative cover density is approximately 60%, as shown on the aerial photo included above. 3 The site is currently in use by Larimer County for fleet operations. There are no known site contamination or environmental features to be protected. The following are estimates of the construction site:  Construction Site Area to be disturbed via grading 2.3 acres  Total Project Area 2.3 acres  Percentage impervious area before construction 40 %  Percentage impervious area after construction 70 % Receiving Waters The project lies within the lower portion of the Dry Creek Basin. The project site drains to existing storm drainage systems located in Redwood Street. There are no streams, wetlands or other water bodies on the project site. Site Features and Sensitive Areas The site is simple vacant land with no unique site features such as streams, stream buffers, wetlands, specimen trees, natural vegetation, or steep slopes. There are no sensitive areas within the property limits requiring protection. The site drains to existing storm sewer systems. Potential Sources of Pollution The construction activities include installation of water and sewer services, grading and the construction of parking areas and hardscape. No asphalt concrete batches are planned. Sources of potential pollution and the applicable BMP include: Pollution Source BMP Treatment  Grading to include excavation and fill Silt Fence, Inlet protection, Perimeter Swale, Vegetation  Saw cutting activities Removal of saw cut waste and water  Vehicle tracking of sediments Vehicle Tracking Control  Loading and unloading operations Silt Fence, Inlet protection  Outdoor storage activities Silt Fence, Inlet protection  Vehicle and maintenance and fueling Spill Control Plan  Dust Temporary/Permanent Vegetation, Watering  Concrete truck and equipment washing Concrete Washout Area  Non industrial waste such as worker trash Various Good Housekeeping BMPs and portable toilets There are no contaminated soils identified within the project limits. No asphalt or concrete batch plants shall be placed on the project site. 4 SECTION 3 - EROSION AND SEDIMENT CONTROL BMPS The structural and vegetative BMPs to be implemented to control sediment and pollutants in stormwater discharges include the following:  The installation of a vehicle tracking pads for construction vehicles exiting the site.  Perimeter silt fencing to control overland sediment transport to adjacent properties.  Inlet protection consisting of gravel inlet filters for existing and proposed storm inlets receiving drainage from the project site  The installation of a concrete truck washout pit.  Permanent vegetation such as grass sod and grass seeding.  Good housekeeping BMPs as described in the appropriate section below These BMPS will be inspected bi-weekly and after every rainfall event to determine the condition of the BMPs. An evaluation will be made of the structural integrity of the individual BMPs and the sediment loading on each. Once any BMP receives sediment loading representing one half of the total sediment storage capacity, it will be cleaned out and restored to original condition. Any BMP’s that are found to have failed will be replaced as necessary. All sediment control, erosion control and vegetative stabilization shall be performed in accordance with the current versions of City of Fort Collins Storm Drainage Design Criteria and Construction Specifications and the Urban Storm Drainage Criteria Manual. Volume 3, Best Management Practices. Establish Stabilized Construction Exits A vehicle tracking pad will be installed at both proposed new entrance to the project. This will allow for the removal of accumulated sediment on construction vehicles prior to exiting the site. Sediment tracked onto Redwood Street or Vine Drive will be swept on an as-needed basis as determined by the City erosion control inspector. Any sediment tracked onto Redwood Street will drain towards the adjacent proposed inlets, where gravel inlet filters will be placed. Establish Perimeter Controls and Sediment Barriers Perimeter silt fencing will be installed on all sides of the property. These areas receive little flow from the site, and will serve primarily to collect small amount of sediment and establish the limit of disturbance in these areas. Protect Storm Drain Inlets There is one existing inlet in Redwood Street that will receive stormwater runoff during construction. The inlet will have a gravel filter installed prior to construction. All gravel filters remain in- place until the contributing drainage areas are stabilized. 5 Stabilize Soils The majority of the proposed project consists of buildings, parking lot and associated hardscape. As such, much of the project area will be stabilized with structure. Other portions of the site will be stabilized using landscape material such as trees, shrubs and mulch. The balance of the disturbed area will be stabilized with seeding once construction is complete. Formal landscape areas will be stabilized with trees, shrubs and landscape mulch in accordance with the Landscape Plan for the project. The balance of the vegetated areas will be permanently stabilized with seed and mulch, as follows:  Sideoats Grama 2.8 PLS/acre  Buffalograss 6.2 PLS/acre  Blue Grama 0.6 PLS/acre  Inland Saltgrass 0.9 PLS/acre  Bottlebrush Squirreltail 1.8 PLS/acre  Prairie Junegrass 0.2 PLS/acre  Wester Wheatgrass 3.2 PLS/acre  Alkali Sacaton 0.3 PLS/acre Areas for vegetative stabilization shall be provided with 4” of topsoil which over subgrade which has been scarified to a depth of 8”. Top soil material, amendments and placement shall meet the requirements of Section 12-130-132 of the Fort Collins Municipal Code. Seed shall be distributed evenly over disturbed areas at the rates shown. Seed shall be sown using a mechanical type 3 drill. Irrigation shall be provided as necessary by the contractor. Mulch will be applied immediately after seeding. Grass hay or straw will be anchored to the soil by a crimper that will crimp the fiber four inches or more into the soil or mulch netting installed according the manufacturer’s instructions. Areas of soil to remain bare for more than 30 days shall be reseeded with a temporary seed mix, as depicted blow. Top soils for seeded areas shall be fertile, friable, sandy loan or loam, free from stones and noxious weeds. Soil shall be amended with100% humus organic matter in accordance with the Criteria.. Annual ryegrass is to be drilled at 20 lbs seed per acre and hybrid sudan grass is to be drilled at 15 lbs seed per acre depending on the time of seeding, as follows: Seeding Season Seed Type Jan - Feb do not seed Mar - May 15 annual ryegrass May 16 - May 31 hybrid sudan grass June - July hybrid sudan grass Aug - Sep annual ryegrass Oct - Dec do not seed 6 Final stabilization is reached when all ground surface disturbing activities at the site have been completed, and uniform vegetative cover has been established with a vegetative plant density of a least 70% of pre-disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. SECTION 4 - GOOD HOUSEKEEPING BMPS Management of Soils and Waste Trash and waste products will be removed as needed during construction. Waste material shall not be stored on site nor shall it be buried on site. There are no known contaminated soils currently on the project site. A temporary soil stockpile is provided. This stockpile will be used for temporary storage of topsoil strippings and other material to be reused during the project. It is not anticipated that a large stockpile area will be needed since waste soil will be minimal. Non-industrial waste such as trash and miscellaneous debris will be collected in trash receptacles for removal and disposal. No debris shall be allowed to accumulate in any area except trash receptacles suitable for the waste material. Loose trash shall be collected on a daily basis and the site shall be kept in an orderly state. Management of Building Material Storage and Delivery The project will require material such as pipe, manholes, drainage structures, and building materials. These materials will generally be delivered to the appropriate area of the project site where needed. Longer term storage of construction materials will be located within the area protected by the BMP’s discussed. Parking for construction personnel will be on the existing adjacent Larimer County Shops property. All construction traffic exiting the site will pass through the stabilized construction exit discussed above. Management of Vehicle Fueling and Maintenance There will be no vehicle fuel storage on site. It is not expected that major vehicle maintenance or fueling activities will be needed on site. On-site vehicle repair and minor maintenance will be performed within areas protected by the BMPs discussed. Care shall be taken to place containers under any operations involving fluids such as fuel, oil, grease, hydraulic fluid, or other hazardous substances for collection and immediate removal from the site. Dust Control Dust may be created during the earthmoving and grading operations. Dust exceeding acceptable levels will be mitigated as needed with watering or other acceptable methods. Spill Prevention and Control Plan Spill control procedures shall be implemented anytime chemicals and/or hazardous substances are stored. Substances may include, but are not limited to, the following:  Soil stabilizers/binders 7  Dusts  Herbicides  Growth inhibiters  Fertilizers  De-icing chemicals  Fuels or other petroleum distillates  Paints  Lubricants All hazardous or MSDS material shall be used and stored in accordance with the appropriate manufacture’s recommendations. Spill prevention plan/supplies will be located on-site. Spill control responsibility shall be the responsibility of the contractor. Groundwater and Dewatering The proposed buildings will be slab-on-grade. A geotechnical investigation provided by Terracon indicates groundwater is well below the lowest planned excavation. However, if groundwater is experienced, groundwater will be mitigated by the contractor in accordance with State and local requirements. SECTION 5 - INSPECTIONS and MAINTENANCE Inspections Regular inspections will be conducted by the contractor on a bi-weekly basis. Inspections will also be held after each significant (greater than 0.2 inches) rainfall event. These inspections will include all BMPs proposed for the project. The Contractor shall assign competent, qualified personnel to conduct the inspections. Maintenance of Controls Any BMP found to be damaged will be repaired or replaced within two days. BMP’s which are over half full of sediment (measured by volume) will be cleaned out and the material will be incorporated into on-site fill or taken off-site for disposal. Corrective Action Log Repair, replacement and maintenance of BMPs undertaken will be logged. A proposed Corrective Action Log is included in the appendix. SECTION 6 - RECORDKEEPING Recordkeeping The following records will be kept the project site available for inspectors to review: Dates of grading, construction activity, and stabilization A copy of the construction general permit Inspection reports Corrective action reports 8 Log of Changes to the SWPPP Changes to the SWPPP such as additions of new BMPs, replacement of failed BMPs, significant changes in the activities or timing of the project, changes in personnel, changes in inspections and maintenance procedures, and updates to maps will be logged. A proposed Log of Changes to the SWPPP is included in the appendix. 9 SWPPP APPENDICES  Vicinity Map  Inspection Reporting Form  Corrective Action Log  Sediment and Erosion Control Plan 10 Vicinity Map, NTS 11 CORRECTIVE ACTION REPORT – HICKORY COMMONS 12 DATE: CORRECTIVE ACTION REQUIRED: CORRECTIVE ACTION TAKEN: CORRECTIVE ACTION BY: