HomeMy WebLinkAboutC406 - SWPP INFORMATIONCrA Crosby silt loam, 0 to 3 percent slopesThis is a somewhat poorly drained soil with a seasonal high water table at 0.5 to 2.0 ft. This soilis located on rises on till plains; slopes are 0 to 3 percent. The native vegetation is hardwoodforest. The surface layer is silt loam and has moderately low to moderate organic mattercontent (1.0 to 3.0 percent). Permeability is very slow (<0.06 in/hr) in the most restrictive layerabove 60 inches. Available water capacity is moderate (6.2 inches in the upper 60 inches).The pH of the surface layer in non-limed areas is 5.1 to 6.5. Droughtiness and wetness aremanagement concerns for crops production. This soil responds well to tile drainage; it isdesignated potentially highly erodible (class 2) in the Highly Erodible Land (HEL) classificationsystem.Br Brookston silty clay loamThis nearly level soil is in depressions, on flats, and in narrow drainageways between betterdrained soils on broad, undulation plains. Slopes are 0 to 2 percent. In some small areas, thissoil has a silt loam or clay loam surface layer. Runoff is very slow. Wetness is the mainlimitation. Because of wetness, the soil has severe limitations for nonfarm uses. Most areasare cultivated. A few are wooded. Wooded areas support fair stands of hardwoods, but someare heavily pastured. Permeability is moderate (0.6 to 2 in/hr) in the most restrictive layer above60 inches. Available water capacity is high (12 inches in the upper 60 inches). The pH of thesurface layer in non-limed areas is 6.6 to 7.3.MmB2 Miami silt loam, 2 to 6 percent slopes, erodedThis is a moderately well drained soil with a seasonal water table at 2.0 to 3.5 ft. This soilis located rises on till plains; slopes are 2 to 6 percent. The native vegetation is hardwoodforest. The surface layer is silt loam and has moderately low organic matter content (1.0 to 2.0percent). Permeability is very slow (<0.06 in/hr) in the most restrictive layer above 60 inches.Available water capacity is moderate (6.1 inches in the upper 60 inches). The pH of the surfacelayer in non-limed areas is 5.1 to 6.5. Droughtiness and water erosion are managementconcerns for crop production. This soil is designated potential highly erodible (class 2) in theHighly Erodible Land (HEL) classification system.SECTION BStormwater Pollution Prevention PlanConstruction ComponentsThe construction component of the SWPPP includes stormwater quality measures to addresserosion, sedimentation, and other pollutants associated with land disturbance and constructionactivities. Proper implementation of the plan and inspections of the construction site arenecessary to minimize the discharge pollutants. The project Site Owner should be aware thatunforeseen construction activities and weather conditions may affect the performance of apractice or the effectiveness of the plan. The plan must be a flexible document, with provisionsto modify or substitute practices as necessary.B1 Description of potential pollutants sources associates with the construction activities:Silt and sediment from exposed soils, leaves, mulch, vehicular sources such as leaking fuelor oil, brake fluid, brake dust, trash, and debris, biological agents found in trash, fertilizers,herbicides, pesticides, acid rain, lime dust and concrete washout.B2 Sequencing of storm water quality implementation relative to land disturbance activities: This plan has been created in an effort to eliminate or reduce sediment from leaving theProject during construction while protecting the adjoining properties and the offsite stormsewer system. If measures specified in these plans are implemented the chance thatsediment will leaving the site will be reduced.Pre-Construction Activities:1.Schedule Pre-Con with City of Carmel Engineering Department before commencingwork.2.Call the Indiana Underground Plant Protection Systems, Inc. ("Holey Moley") at1-800-382-5544 to check the location of any existing utilities. They should be notifiedtwo working days before construction takes place3.Install silt fencing at the edges of the project site as indicated on plans. Preservation ofexisting grass strips upstream and downstream of silt fencing greatly reduces sedimenttransport offsite.4.Maintain a 10' minimum grass filter strip along the site perimeter adjacent to publicstreets wherever possible.5.Install inlet protection measures at all existing inlets as shown on the plans6.A construction entrance shall be placed per the plan location.Project Information:Project Name: Clay Center Road ElementaryAddress: Clay Center Road, Carmel, Indiana 46032County: HamiltonCivil Township: Clay Quarter: SW Section: 34 Township: 18-N Range: 3-ELatitude: 39°57'43''NLongitude:86°10'40''WProject Location: 11905 Clay Center Road, Carmel, Indiana 46032Project Site Owner and Contact Information:Company Name (if applicable): Carmel Clay SchoolsName (Individual): Ron Farrand Jr., RAPosition: Director of Facilities and TransportationAddress: 5201 East 131st StreetCity: Carmel State: IN Zip: 46033Phone: (317) - 815 - 3962Project Narrative:New Elementary School with parking spaces, bus loading / unloading area, playgrounds andbaseball fields. Storm Water utilities needed for operation of the development are also includedwith this project.SECTION AStorm Water Pollution Prevention Plan ElementsAssessment of Construction Plan Elements for Technical Review and CommentThis section is to address technical review and comments of the Construction/StormwaterPollution Prevention Plan for the Project.A1Plan Index Provided on this sheetA211 x 17 Plat boundaries: The Plat boundaries for this property are included as Sheets 1and 2 of the ALTA survey included with this plan set.A3Project Narrative:This school project will be built on existing agricultural land. The proposed 106,400 S.F.building footprint will be constructed along with 148 parking spaces, , 17 bus parkingspaces, and vehicle/bus maneuvering drives. Several play areas and four baseballdiamonds are also included in this project.A4Vicinity Map: Denoted on Sheet C-100A5Legal description of project site: The legal description is on Sheet 3 of the survey.A6Location of all proposed site improvements: Denoted on Sheets: and C-501-C504A714 Digit Hydrologic Code:05120201090060A8State or Federal Water Quality Permits: NoneA9In the pre-developed condition, storm runoff flows southeast across the site to a stormsewer system that discharges to Ames Run, a tributary to Williams Creek. In postconstruction conditions, runoff will continue to drain southeast via storm sewer pipes to anew wet detention pond at the SE property corner that discharges into the same existingstorm sewer system that discharges into Ames Run.A10Location of all wetlands, lakes & water courses on and adjacent to site: See TopograhicSurvey Sheets 1, 2 & 3.A11Receiving Waters:Ames Run, a tributary to Williams Creek.A12Identification of potential discharges to groundwater: Excavation pits can be potentialsources of discharge into groundwater. There is a potential for discharges intogroundwater from sediment resulting from exposed soils, leaves, mulch, and vehicularsources if a significant ain event occurs while excavations are open.A13100 Year Floodplains, Floodways and Flood Fringes: NoneA14Pre-Construction and Post-Construction Peak Discharge10 year Pre-Construction Peak Discharge = 55.9510 year Post-Construction Peak Discharge = 31.17A15Adjacent Land Use: See Plan Sheet C406 for more detailNorth:PUD, ResidentialSouth: S-1, ResidentialEast: PUD, ResidentialWest: S-1, ResidentialA16Locations and approximate boundaries of all disturbed areas: See Plan Sheet C-401,C-403.A17Identification of existing vegetative cover: See Topographic Survey Plan Sheets 1 & 2.A18Soils Map including descriptions and limitations: See Plan Sheet C-406 for soils map,descriptions and limitations.A19Locations, size and dimensions of proposed storm water systems:See Plan Sheets C-501-C504 for proposed storm sewer systemA20Locations, size and dimensions of any proposed off-site construction activitiesassociates with this project: NONE.A21Locations of Soil Stockpiles: See Sheet C401 & C402.A22Existing site topography: See Topographic Survey Plan Sheets 1 & 2, and C-101 forexisting site topographyA23Proposed final topography: See Plan Sheet C-301 - C-304 for proposed site grading anddrainage patternsA24Name, Contact Info, and Qualifications of the individual in charge of SWPPPimplementation.Trained Individual Responsible for SWPPP Inspections:Company Name: Carmel Clay SchoolsContact Person:Ron Farrand Jr., RATitle/Position:Director of Facilities and TransportationAddress:5201 East 131st StreetCity: Carmel State: IN Zip: 46033Phone: (317)815-3962BMP - Wet Pond with Native BanksMonthly Inspection MaintenanceUndesirable vegetative growth:Remove undesirable vegetation along pond banks including but not limited to tree seedlings, cattails, etc.Remove Floatable debris and visible pollution:Remove any floatable debris if present.Inspect pond and banks for erosion, failure, etc.:Fill and repair any rills or eroded areas from concentrated sheet flow runoff. Repair any eroded soils around outlet and inletstructures. Reseed all disturbed areas and areas of insufficient vegetative cover.Inspect and note sediment. Remove when measurements indicate removal is required:Note and measure the sediment in the pond bottom relative to the indicated minimum depth listed in the post constructionOperation and Maintenance Manual. Remove sediment when pond depth reaches minimum allowed.Remove debris at storm inlets, outlets, Headwalls, endwalls and spillways:Remove all trash. Leaves and debris.Complaints from residents: Note and address any complaints from residents.Public Hazards:Note and address any current or potential Public Hazards.Annually and after major storms Inspection MaintenanceVegetation:Remove undesirable vegetation along pond banks including but not limited to tree seedlings, cat-tails, etc. Mow as necessary.Erosion on embankment:Fill and repair any rills or eroded areas from concentrated sheet flow runoff. Repair any eroded soils around outlet and inletstructures. Reseed all disturbed areas and areas of insufficient vegetative cover.Animal Burrows:If present, obtain services of pest control or other company to have animals removed.Cracking, bulging or sliding of dam:Inspect pond and forebay banks for erosion, failure, leaks, seeps or slope protection failure. If failures are present obtain theservices of a Licensed Professional Civil or Geotechnical Engineer for soil repair recommendations.All Drains clear and functioning:Inspect all inlet drains and remove any silt or debris as necessary.Outlet Structure: Inspect and check the Low Flow orifice for blockage, Trash rack for debris and corrosion. Excessive buildup, cracks, spaldingand repair as necessarySECTION CStormwater Pollution Prevention PlanPost Construction ComponentThe post construction component of the SWPPP includes the implementation of storm waterquality measures to address pollutants that will be associated with the final land use. Postconstruction storm water quality measures should be functional upon completion of the project.Long term functionality of the measures are critical to their performance and should be monitoredand maintained.List of Water Quality units:1. Aqua-Swirl AS-10.2. Wet pond with native banks.C1Description of pollutants and their sources associated with the proposed and use:Silt and sediment from expose soils, leaves, mulch, vehicular sources such as leaking fuel or oil, brake fluid, brake dust, grease, antifreeze, metals, rubber fragments, road grit, salts and sands, construction trash and debris, fertilizers, household items including but not limited to cleaning agents, chemicals, paint, miscellaneous home improvement materials, toys, clothing and animal waste, elevated storm runoff temperatures, acid rains, pesticides and pathogens.C2Sequence describing storm water quality measure implementation:1.Inspect and maintain all erosion control measures as detailed in the Storm Water Pollution Prevention Measures Maintenance Requirement beginning immediately after installation and continuing until vegetation has been sufficiently establishedand all construction activities completed.2.Remove all individual inlet protection, coir fiber log check dams, silt fences, etc. only after seeding/sodding and sufficient vegetative growth has been established in each area to a point where sediment/pollutants will not enter the detention basin or storm sewer system.3.Inspection and maintenance of all common area and infrastructure improvements is the responsibility of the owner/developer or his designee until improvements are accepted for maintenance by local agencies.C3Description of proposed post-construction storm water quality measures: Site and facility design for storm water quality protection on this site employs a multi-levelstrategy consisting of:1.Controlling sources of pollutants.2.Filtering Runoff through a hydrodynamic filter then a wet water quality detention basin.3.Permanent erosion control seeding/sodding and plantings.C4Location, dimensions, specifications and construction details of storm water quality measures. The hydronamic filter is located NW of the wet detention basin. The detention basin is located at the SE propserty corner.C5Description of maintenance guidelines for proposed water quality measures:LOCATION MAPSOILS MAPELEMENTDESCRIPTIONSHEETA1INDEXA211x17 EXHIBITA3NARRATIVEA4VICINITY MAPA5LEGAL DESCRIPTIONPG. 3 OF SURVEYA6IMPROVEMENTSC-201 & C-301A7HYDROLOGIC CODEC-406A8STATE OR FEDERAL PERMITSNONEA9STORM WATER DISCHARGE POINTSA10WETLANDS, LAKES, AND WATER COURSESA11RECEIVING WATERSSURVEY PG.'s 1&2, C-406A12DISCHARGE TO GROUND WATERA13FLOODPLAIN, FLOOD WAYS, & FLOODWAY FRINGENONEA14PEAK DISCHARGESA15ADJACENT LAND USEA16CONSTRUCTION LIMITS C-401,C-402A17EXISTING VEGETATIVE COVERA18SOILSA19PROPOSED STORM WATER SYSTEMSA20OFFSITE ACTIVITIESA21SOIL BORROW OR STOCKPILESA22EXISTING TOPOGRAPHYA23FINAL TOPOGRAPHYC301-C304B1POTENTIAL POLLUTANTSB2SEQUENCE DESCRIBING STORMWATER QUALITYB3CONSTRUCTION ENTRANCEB4SEDIMENT CONTROL FOR SHEET FLOWB5SEDIMENT CONTROL FOR CONCENTRATED FLOWB6SEDIMENT CONTROL FOR SEWER INLET PROTECTIONB7RUNOFF CONTROL MEASURESB8STORMWATER OUTLET PROTECTIONB9GRADE CONTROL STRUCTURENONEB10DETAILS FOR EACH STORM WATER QUALITY MEASUREB11TEMPORARY STABILIZATION METHODSB12PERMANENT STABILIZATIONB13MATERIAL HANDLING AND SPILL PREVENTIONB14MONITORING & MAINTENANCE GUIDELINESB15EROSION & SEDIMENT FOR INDIVIDUAL LOTSN/AC1POLLUTANTS & SOURCES ASSOCIATED WITH LAND USEC2SEQUENCE FOR STORM WATER QUALITY MEASURESC3POST CONSTRUCTION STORWATER QUALITYC4DETAILS FOR EACH STORM WATER QUALITY MEASUREC5DESC. MAINTENANCE FOR POST CONSTRUCTION SWQ MEASURESSWPPP ELEMENT INDEXC-406C501-C504NONE C-401,C-402C-401-C-406C-405C-401-C402C-403C-406C-405C-405C-406C-406C-406C-406C-406NONEC-10018095Project Number:Drawing Number:Certified By:Checked ByDrawn ByIssue DateRevisions:PROJECT:Scope Drawings:CARMEL, INDIANA
NEW
FOR
CARMEL CLAY SCHOOLS
CARMEL ELEMENTARY SCHOOLSDrawing Title:06-21-19SOMKRev. #RevisionDescriptionIssueDate1ADDENDUM7/9/20193ASI #18/28/2019SECTION C continued:Stormwater Pollution Prevention PlanPost Construction ComponentBMP - Stormwater Quality Treatment Unit (AQUA-SWIRL, AS-10Basic OperationThe Storm water Quality Treatment Unit ( SQTU ) is a hydrodynamic separator designed to enhance gravitational separation offloating and settling materials from storm water flows. Storm water flows enter the unit tangentially to the grit chamber, whichpromotes a gentle swirling motion. As polluted water circles within the grit chamber, pollutants migrate toward the center of theunit where velocities are the lowest. The majority of settleable solids are left behind as storm water exits the grit chamberthrough two apertures on the perimeter of the chamber. Next, buoyant debris and oil and grease are separated from waterflowing under the baffle wall due to their relatively low specific gravity. As storm water exits the System through the flowcontrol wall and ultimately through the outlet pipe, it is relatively free of floating and settling pollutants.Over time a conical pile tends to accumulate in the center of the unit containing sediment and associated metals, nutrients,hydrocarbons and other pollutants. Floating debris and oil and grease form a floating layer trapped in front of the baffle wall.Accumulation of these pollutants can easily be assessed through access manholes over each chamber. Maintenance istypically performed through the manhole over the grit chamber.Inspection of SQTUSQTU should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate atwhich the System collects pollutants will depend more heavily on site activities than the size of the unit, e.g., unstable soils orheavy winter sanding will cause the grit chamber to fill more quickly but regular sweeping will slow accumulation.Inspection is the key to effective maintenance and is easily performed. Quarterly inspections of the accumulated sediment.Pollutant deposition and transport may vary from year to year and quarterly inspections will help insure that Systems arecleaned out at the appropriate time. Inspections should be performed more often in the winter months in climates wheresanding operations may lead to rapid accumulations, or in equipment wash down areas. It is very useful to keep a record ofeach inspection.The SQTU system should be cleaned when inspection reveals that the sediment depth has accumulated to the determinedelevation or depth. This determination can be made by taking 2 measurements with a stadia rod or similar measuring device.Cleaning of SQTU StructuresMaintaining the SQTU is easiest when there is no flow entering the Systems. For this reason, it is a good idea to schedule theclean out during dry weather. Clean out of the SQTU with a vacuum truck is generally the most effective and convenientmethod of excavating pollutants from the System. If such a truck is not available, a "clamshell" grab may be used, but it isdifficult to remove all accumulated pollutants with such devices.Oil or gasoline spills should be cleaned out immediately. Motor oil and other hydrocarbons that accumulate on a more routinebasis should be removed when an appreciable layer has been captured. To remove these pollutants, it may be preferable touse adsorbent pads since they are usually cheaper to dispose of than the oil water emulsion that may be created byvacuuming the oily layer. Trash can be netted out if you wish to separate it from the other pollutants.Accumulated sediment is typically evacuated through the manhole over the grit chamber. Simply remove the cover and insertthe vacuum hose into the grit chamber. As water is evacuated, the water level outside of the grit chamber will drop to thesame level as the crest of the lower aperture of the grit chamber. It will not drop below this level due to the fact that the bottomand sides of the grit chamber are sealed to the tank floor and walls. This "Water Lock" feature prevents water from migratinginto the grit chamber, exposing the bottom of the baffle wall. Floating pollutants will decant into the grit chamber as the waterlevel there is drawn down. This allows most floating material to be withdrawn from the same access point above the gritchamber.If maintenance is not performed as recommended, sediment may accumulate outside the grit chamber. If this is the case, itmay be necessary to pump out all chambers. It is a good idea to check for accumulation in all chambers during eachmaintenance event to prevent sediment build up there.Manhole covers should be securely seated following cleaning activities, to ensure that surface runoff does not leak into the unitfrom above.After a storm event, treated runoff is decanted out of the SQTU at a controlled rate, restoring the water level to a lowdry-weather volume. This reveals a conical pile of accumulated sediment in the center of the grit chamber. Besides facilitatinginspection and cleaning through the unobstructed access, the low water level significantly reduces maintenance costs bydecreasing pump-out volume.Note: As the generator, the landowner is ultimately responsible for the proper disposal of materialremoved from water quality treatment structures.Quarterly inspections of the SQTU shall include observation of the accumulated sediment. Pollutant deposition andtransport may vary from year to year and quarterly inspections will help insure that the systems are cleaned out at theappropriate time. Inspections should be performed more often in the winter months in climates where sanding operationsmay lead to rapid accumulations, or in equipment wash down areas.C-406PG. 1-2 OF SURVEYPG. 1-2 OF SURVEYC501-C504PG. 1-2 OF SURVEYC-401-C-403SECTION B - continuedStormwater Pollution Prevention PlanConstruction ComponentsConstruction ActivitiesB1For reference & sequencing see sheets C401 & C402.B2 Stable construction entrance location(s) and specifications: See Plan Sheet C-401 -C402.B3 Sediment control measures for sheet flow areas: See Plan Sheet C-401, 402.B4 Sediment control measures for concentrated flow areas: C-401, 402.B5 Storm sewer inlet protection measures, locations and specifications: See Plan Sheets C-401, 402.B6 Runoff control measures: See Plan Sheets C-401, 402.B7 Storm water outlet protection specifications: See Plan Sheets C401-C403.B8 Grade control structure locations and specifications: None.B9 Location, dimensions, specifications and construction details of each storm water qualitymeasure: See Plan Sheet C404-C406.B10 Temporary Surface stabilization methods appropriate for each season: See Plan Sheets C401-C402.B11 Permanent surface stabilization specifications. See Plan Sheet C-406.B12 Material handling and spill prevention plan: Purpose: The intention of this Spill Prevention, Control and Countermeasures (PCC) is toestablish the procedures and equipment required to prevent the discharge of oil andhazardous substances in quantities that violate applicable water quality standards,cause a sheen upon or discoloration of the surface of Receiving water or adjoiningshorelines, or cause sludge or emulsion to be deposited beneath the surface of thewater or adjoining shorelines. The plan also establishes the activities required tomitigate such discharges (i.e. countermeasures) should they occur. Definitions: Pollutant: Means pollutant of any kind or in any form, including but not limited to sediment, paint, cleaning agents, concrete washout, pesticides, nutrients, trash, hydraulic fluids, fuel, oil, petroleum, fuel oil, sludge, oil refuse, and oil mixed with wastes other than dredged soil. Discharge: Includes, but is not limited to, any spilling, leaking, pumping, pouring,emitting, emptying or dumping.Receiving Navigable Waters: Means all waters of the United States that are connectedwith a Receiving stream, lake, or sea. [Note: this definition is usually interpreted tomean any wastewater even normally dry wash or storm sewer) that eventually drainsinto a Receiving stream. Plan Review Amendments:This plan shall be reviewed and/or amended, if necessary, whenever there is a change in the design of the site, construction, operation, ormaintenance which materially affects the site's potential for the discharge of regulatedmaterial.Prediction of Potential Spills: 1. Nearest Receiving Water:Williams Creek2. Drainage System: In the Pre Developed condition storm runoff flows southeastacross the site to a storm sewer system that discharges to Ames Run, a tributaryto Williams Creek. In post construction conditions, runoff will continue to drainsoutheast via storm sewer pipes to a new wet detention pond that will outlet atthe same existing storm sewer system that discharges into Ames Run.3. Possible spill sources (during and post-construction): Vehicular sources such as leaking fuel or oil, brake fluid, grease, antifreeze; construction trash and debris, biological agents found in trash and debris,fertilizers, household items including but not limited cleaning agents, chemicals,paint, herbicides and pesticides. 4. Groundwater contamination: The facility maintains NO above ground oil & separator or underground storagetanks at this site. Therefore, it is felt that there is little or no possibility of post-constructiongroundwater contamination. The facility does have city sanitary sewer and citywater.Alert Procedures for Spills: 1. Any personnel observing a spill will immediately initiate the following procedure: a. Notify the designated emergency coordinator for the project. 2. The Emergency Coordinator will then take the following actions: a. Barricade the area allowing no vehicles to enter or leave the spill zone. b. Notify the Indiana Department of Environmental Management, Office of Emergency Response by calling the appropriate telephone number. Office 317-233-7745 Toll Free 800-233-7745 Also the National Response Center at 800-424-8802 and provide the following information: - Time of observation of the spill - Location of the spill - Identity of material spilled - Probable source of the spill - Probable time of the spill - Volume of the spill and duration - Present and anticipated movement of the spill - Weather conditions - Personnel at the scene - Action initiated by personnel c. Notify the Carmel Fire Department : Phone 911 d. Notify the Carmel Police Department: Phone 911 e. Notify waste recovery contractor, maintenance personnel or other contractual personnel as necessary for clean up f. Coordinate and monitor clean up until the situation has been stabilized and all spills have been eliminated. g. Cooperate with the IDEM-OER on procedures and reports involved with the event.Cleanup Parameters: 1. The developer shall be continually kept informed, maintain lists of qualified contractors and available Vac-trucks, tank pumpers and other equipment readily accessible for clean-up operations. In addition, a continuallyupdated list of available absorbent materials and clean up supplies should be kept on site. 2. All maintenance personnel will be made aware of techniques for prevention of spills. They will be kept abreast of current development or new information on theprevention of spills and/or necessary alteration to this plan. 3. When spills occur which could endanger human life and this becomes primary concern, the discharge of the life saving protection function will be carried out by the local police and fire departments. 4. Absorbent materials, which are used in cleaning up spilled materials, will bedisposed of in a manner subject to the approval of the Indiana Department of Environmental Management. 5. Flushing of spilled material with water will not be permitted unless so authorized by the Indiana Department of Environmental Management.C-406C-406C406-C603C-406C-402, C-403C-401-C-403C-401-C-403C-401, C-402SECTION B - continuedStormwater Pollution Prevention PlanConstruction ComponentsB14Monitoring and maintenance guidelines for each proposed stormwater quality measure:Temporary gravel construction entrance maintenance requirements1.Inspect entrance pad and sediment disposal area weekly and after storm events or heavy use.2.Reshape as needed for drainage and runoff control.3.Top dress with clean stone as needed.4.Immediately remove mud and sediment tracked or washed onto streets by brushing or sweeping. Flushing should only be used if the water is conveyed into a sediment trap of basin.5.Repair any broken road pavement immediately.Coir Fiber Log Check Dam maintenance requirements:1.Inspect coir log check dams after each storm event and promptly remove any sedimentdeposits to insure adequate storage volume for the next rain, taking care not to undermine the entranced bales.2.Inspect periodically for deterioration or damage from construction activities and repair immediately.3.After the contributing drainage area has been stabilized, remove all coir logs and sediment deposits, bring the disturbed are to grade and stabilize.SILT FENCE Rock Check Dam Outlet:1.Inspect check dams and the reinforced silt fence after each storm event, and repair any damage immediately.2.If significant erosion occurs downstream from dams, install a riprap liner downstreamfrom the check dam.3.Remove sediment accumulated upstream from each dam as needed to maintain storagecapacity, to allow drainage through the dam, and to prevent large flows from displacing sediment.4.Add rock to the dams as needed to maintain design height and cross section.When the dams are no longer needed, remove the rock and stabilize with permanentseed and erosion control blanket as shown on the plans.Silt fence maintenance requirements1.Inspect the silt fence periodically and after each storm event.2.If fence fabric tears, starts to decompose or in any way becomes ineffective, replace the affected portion immediately.3.Remove deposited sediment when it reaches half the height of the fence at its lowest point or is causing fabric to bulge.4.Take care to avoid undermining the fence during cleanout.5.After the contributing drainage area has been stabilized, remove the fence and sediment deposits, bring the disturbed area to grade and stabilize.Inlet Protection, and Drop Inlet barrier maintenance requirements.1.Inspect after each storm event and repair if necessary.2.Remove sediment, without flushing, when it reaches half the height of barrier.3.Deposit removed sediment where it will not enter storm sewer drains.4.Replace or repair if torn or damaged in other ways.5.When contributing drainage area has been stabilized, remove and properly dispose of construction material and sediment, finish grade the disturbed area and stabilize.Erosion control blanket (surface applied) maintenance requirements1.During vegetative establishment, inspect after each storm event for any erosion belowthe blanket.2.If any area(s) shows erosion, pull back that portion of the blanket covering it, reseed the area and relay and staple the blanket.3.After vegetative establishment check the treated area periodically.Topsoil (Salvage and Utilization):1.Inspect newly topsoiled areas frequently until vegetation is established2.Repair eroded or damaged areas and re-vegetate.B15Erosion & sediment control specifications for individual building lots: NONE.All erosion and sediment control measures must be properly maintained throughoutconstruction. Temporary and permanent seeding should be watered as needed untilestablished. See Plan Sheets C403-C404.C406SWPPINFORMATION