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Home My WebLink About12A Offsite Erosion & Sediment ControlUri *!!i! ilk v j al s I a► al ar at y 9 20 y Si. 31 al I al at al al al al al ai al al al al al al ai a► at al m al al a 31 a! al al ar 31 y a, 116TH STREET 0 =•^r— f Overall Watershed: Williams Creek (HUC *05120201090060) Design Criteria: Adjoining land conditions: 10 -Year 24 Hour Storm Event: Potential Pollutant Sources: North: Residential South: Pond East: Open Residential West: Open Residential Silt, Automotive Grease, Oil, Antifreeze, Brake Fluid, Fuel, Hydrocarbons, Brake Dust, Grit and Sand, Concrete "Washout Paint, Solvents, Miscellaneous Trash, Fertilizer, Pesticides, Detergents \t t t CHATEAUX DE MOULIN PART OF THE E 1/2, NE 1/4 SEC 3- T17N -R3E LATITUDE 39° 5814" N LONGITUDE 86°10'07" W HAMILTON COUNTY, INDIANA SITE CHARACTERISTICS Existing Soil Name Characteristics: CrA Crosby (C) This is a somewhat poorly drained soil. Permeability is very slow. The pH of the surface layer in non limed areas is 5.1 to 6.5. This soil responds well to tile drainage; it is potentially highly erodible. This has a high water table of 0.5 -2.0 FT Br Brookston (13/0) This is a poorly drained soil. Permeability is moderately slow. The pH of the surface layer in non -limed areas is 6.0 to 7.3. This soil is hydric. Basements are not recommended because of wetness concerns. This soil responds well to tile drainage; it is not highly erodible. This has a high water table of 0 -1.0 FT MoC3 Miami (B) This is a well drained soil. Permeability is moderate to moderately slow. The pH of the surface layer in non limed areas is 5.6 to 7.3. This soil is potentially highly erodible. Addressed Soil Limitations Several of the soils listed above have a normally high water table. To combat this, sub surface drains have been added under the roadway. Drain stubs have also been added at each lot for use by the home builder. As stated above, these soils respond well to tile drainage. Site Drainage Analysis: After review of soil types and on site characteristics, we have determined that there are two major drainage basins draining this parcel. Woods line the property on three sides. Our design will maintain as much of this wooded area as possible. The center of the property is made up of farmland. One portion of the property drains south to an existing pond. The other portion drains east over adjacent property then into the previously mentioned pond. The pond eventually discharges into Williams Creek. Proposed Drainage Analysis: In its developed state the site will maintain only two drainage basins. One will drain east overland, and the other will drain south to the pond shown. This pond will then outlet into an existing pond south on adjacent property. From there the water makes its way through an unnamed waterway to Williams Creek. Basin Pre Developed 10 -Yr 24 Post Developed 10 -Yr 24 Hr (cfs) Hr (cfs) 18.3 4.58 Basin A (East) Basin B 9.85 5.28 (South) CONSTRUCTION STORM WATER POLLUTION PREVENTION PLAN General Construction Site Pollution Management: Sediment Control -Care should be taken to keep silt from leaving the site either through the storm water collection system or overland flow. Install silt fences as shown on the erosion control plan. Use mulch bags or an adequate substitute to eliminate sediment escape through curb inlets. Construction Entrance -A properly constructed construction entrance is crucial to keep dirt from leaving the site on tire treads. Make sure the construction entrance is stabilized. Add stone and gravel when needed to ensure proper functionality of the entrance. Concrete "Washout Initially place the concrete washout area as shown on the erosion control pion. Once this location needs to be moved, do t e followings Keep the washout area at least 50 ft. from the property line, waterbody, waterway, channel, ditch, sub- surface drain, u derground tile, etc. Place the washout area so it will see a limit d amount of storm water runoff. Always install a sign th• t designates where the concrete washout area is. Construction St shown on the p amount of uplan waterbody. Con keep polluted r materials store Any storm wat staging area sh hydrocarbons. construction st sure to have s as kitty litter o Fueling Petrole m Area -Keep the fueling area close to, or within the constructio staging area limits. Use temporary berms to contain spills. uels should be stored in approved containers. Also, have sawd st or another type of absorbent material such as kitty litter on h a nd to soak up spills that do occur. Waste Collectio Area -Have a designated waste collection area. Limit the amou t of upland runoff the collection area is exposed to. Schedule w ste collection to prevent containers from overfilling. Collect, remove, and dispose of all construction site wastes at uthorized disposal areas. Hazardous Mat consulted abou hazardous mat containers befo the original pro information. AI disposal. Never them. Pesticides -Folio apply to the u handle the mat in a dry cover pesticides in c application rate materials availa in order to co T NON- ACCESS EASEMENT ging Area -Use the construction staging area as ans. This are should be placed so it limits the runoff, and does not drain directly into a truct temporary berms around the staging area to noff from leaving the site. Keep hazardous inside the construction staging area and sealed. r inlets that may see runoff from the construction uld be equipped with absorbent strips to catch ehicle maintenance should be done in the ging area whenever possible. If spills occur be wdust or another type of absorbent material such hand to soak up spills that do occur. rials -Local waste management authorities should be the requirements for disposing and storing of rials. Empty and clean all hazardous waste e disposing of to prevent leaks. Never remove uct label. It contains important safety ays follow the labels recommendation for use and mix hazardous materials before disposing of all federal, state, and local regulations that e, handling or disposal of pesticides. Do not rials any more than necessary. Store pesticides d area. Construct berms or dikes to contain se of spillage. Follow the recommended and methods. Have equipment and absorbent le in areas where pesticides are stored and used tain and clean up any spills that occur. Fertilizers -Apply fertilizers at the minimum rate and to the minimum area needed. Work the fertilizer deeply into the soil to reduce exposure of nutrients to storm water runoff. Apply fertilizer at lower application rates with higher application frequency. Limit hydroseeding, which is the simultaneous application of lime and fertilizers. Ensure that erosion and sediment controls are in place to prevent fertilizers and sediments from bein trans orted off -site. 8 51✓ Potential Pollutant Sources: Storm Water Quality Measures: iiarurvemxi��sca Utz I Maintenance of Storm Water Quality Measures: APPARENT EX/STING R/W r 11 a al al al s al al ai al al al al al s a a a s ct: Detergents -Use detergents only as recommended, and limit their use onsite. Wash water containing detergents should not be dumped into the storm drain system. It should be directed to a sanitary sewer or be otherwise contained so that it can be treated at a wastewater treatment plant. Spill Prevention Plan Follow the above suggestions for treating minor spills involving: fuel, oils, paints, solvents, detergents and other listed hazardous materials. For all spills, especially those involving a significant amount of material, or a materi not identified above contact local agencies immediately for assistance. These agencies include, but are not limited to the local police department, local fire department, hospitals, publicly owned treatment works. Have phone numbers posted for these agencies. POST CONSTRUCTION STORM WATER POLLUTION PREVENTION PLAN Impervious Areas- Impervious areas such as roads, driveways, and rooftops will contribute small amounts of pollutants. They include, but are not limited to grease, oil, antifreeze, brake fluid, hydrocarbons, brake dust, grit, and miscellaneous trash. Homeowners -Local homeowners will also contribute pollutants to the development. They include, but are not limited to fertilizer, pesticides, herbicides, paints, solvents, detergents, fuel, and miscellaneous trash. Forebay -The forebay installed at the entrance of the wet pond during construction was sized per the Indianapolis Stormwater Manual. It will contain the first 0.1" of runoff from the contributing impervious area. Containing this volume allows large sediment to drop out, and solvents or fuels to be contained within the forebay. The wetland plantings will assist in the treatment of these pollutants. Alternate Turnaround -The impervious area was limited by designing an "island" within the cul -de -sac. Reducing the impervious area reduces both the amount of runoff, and the amount of pollutants in the runoff. Buffer Zones Buffer zones have been left intact along the outside of the property. They contain an existing fence line, along with mature trees. The way the buffer zones are situated will limit the amount of runoff and pollutants exiting the property, as well as coming onto the property. Wet Ponds -The wet pond installed on the south end of the property during construction will help the storm water drop out fine sediment before proceeding downstream. Along with this, the wet pond retains water, and discharges it at a slower rate, thus eliminating significant erosion downstream. Vegetated Swales -The vegetated swales installed in various places throughout the development during construction will slow runoff. Slowing the runoff will not only allow sediment to drop out, but also limit the ability for the storm water to erode and carry pollutants downstream. Forebay -The forebay should be checked monthly to ensure proper performance. If the forebay has loose trash it should be removed. When the forebay's capacity has been compromised by over 50X it should be cleaned. To keep the forebay operating properly the wetland plantings, berm, and weir should be maintained. if the plantings die a wetland specialist should be contacted to re- plant. The local landowners are responsible for these tasks. sasassssamsa aamaaaaas J 851 x Alternate Turnaround Little maintenance is needed for the alternate turnaround. Only miscellaneous trash removal, mowing of the grass, or pruning of trees should be needed. The local landowner will be responsible for this maintenance. Buffer Zones Buffer zones will need to have the grass mowed, and trees pruned. The local landowner will be responsible for this maintenance. Wet Ponds- The wet pond should be checked monthly to ensure proper performance. Inlets and outlets should be checked to make sure they are free of debris. Banks should be checked for erosion, and repaired if necessary. Sediment should be removed from the pond once it becomes eutrophic. This usually occurs after 20 -50 years. The local landowners are responsible for these tasks Vegetated Swales-The vegetated swales should be checked semi- annually for issues related to performance. During this time trash should be removed, plants placed if necessary, and any erosion problems addressed. The grass in the swale should be kept at a 3 -4" height. Maintenance associated with the vegetated swale is the responsibility of the local landowner. y rea CD MULCH BAG 0 50' LEGEND WETLAND PLANTINGS EROSION CONTROL BLANKET (NORTH AMERICIAN GREEN S -150) PERMANENT SEEDING MULCHING RIP -RAP REQ'D. (7" 15" THICK) CHECK DAM LOCATION SILT FENCE TEMPORARY SEEDING MULCHING CURB INLET PROTECTION DROP INLET PROTECTION STREET NAME CHART LINE A STREET NAME CHATEAUX DRIVE 100' E 0 Sheet No: 0 LC) N U 0 N CD J 0 E Z 0 (i) U Z W W Z O 0 w w O O E !LTD O U co2 Z 4j" '1) 'SI 0 1 10ft 4.1 LU1 I 13 Dc,?,-.0 W 44 Z zi' AN C k 0 ct OVo' k cl. co M If q) jW m Project No: 03146 l2A 17 \03146 \conplans \03146esc2.dcn 5/27/2004 3:10:25 PM