City of Lenexa Kansas Coon Creek #16 Monticello Lake

Transcription

1 City of Lenexa Kansas Coon Creek #16 Monticello Lake Storm Water Pollution Prevention Plan for Storm Water Discharges Associated with Construction Activity July 2003

2 Signatory Authorization I, Tom A. Jacobs, Stormwater Engineer of the City of Lenexa, Kansas, hereby authorize Coon Creek #16 Monticello Lake Project Construction Manager, as my representative, to sign all reports required by this NPDES General Permit for storm water discharges associated with construction activity, or provide other information requested by the Director of the EPA or Director of the Kansas Department of Health and Environment regarding storm water discharges. Signed: Tom A. Jacobs, P.E. Date:

3 Certification Statement "I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." Signed: Donald W. Baker Project Manager Date:

4 Record of Plan Amendments Amendment Date of Number Amendment Description of Amendment

5 Table of Contents 1.0 Purpose of Plan Site Evaluation Topography and Drainage Soils Climate Runoff Water Quality Receiving Stream Site Construction Plan Construction Activities Construction Sequence Storm Water Management Plan General Description of Storm Water Management System Runoff Coefficient Plant Site Potential Storm Water Pollutant Sources and Control Measures Construction Silt and Dust Offsite Sediment Tracking Petroleum Products Sanitary Wastes Hazardous Wastes Fertilizers Paints Concrete Trucks Waste Materials Allowable Non-Storm Water Discharges TC-1

6 6.0 Best Management Practices Good Housekeeping Hazardous Products Spill Prevention and Response Inspection, Maintenance and Record Keeping Procedures Erosion and Sediment Controls Non-Storm Water Controls Record Keeping Certification of Compliance Contractor Certifications Project Completion Following Figure 1 Project Location Drawing S1001 Site Arrangement Drawing S3000 General Notes/Legend Sheet Drawing S3001 Grading and Drainage Plan Drawing S3013 Erosion and Sediment Control Plan Inspection Form Inspection Form Appendix A - Record of Construction Activity Appendix B - Completed Inspection Forms Appendix C - Construction Permit Language TC-2

7 1.0 Purpose of Plan The purpose of this Storm Water Pollution Prevention Plan (Plan) is to demonstrate compliance with the requirements of the National Pollutant Discharge Elimination System (NPDES) in consideration for issuance of a General Permit for storm water discharges associated with construction activity. The General Permit requires the preparation and implementation of such a plan to prevent, as much as practicable, the release of pollutants in storm water runoff from the construction site to waters of the United States. This Plan provides information concerning the City of Lenexa, Kansas, Monticello Lake site. Administrative requirements and potential storm water and non-storm water pollutant sources are identified. Best management practices to prevent the discharge of non-storm water materials in storm water runoff are also described. The Monticello Lake project site includes the construction of a 33 acre lake, three stormwater wetlands with a total area of 15.8 acres, and three stream restoration project s for a total of 2,750 linear feet on acres of land that the City is acquiring. The project is bordered by Kansas 10 highway on the south, Kansas 7 Highway on the west, 83 rd Street on the north and Woodland Road on the east. The site is located in the portions of Sections 34 and 35, Township 13 South, Range 23 East, and Sections 2 and 3 Township 12 South, Range 23 East in Johnson County. Te proposed facilities will be constructed within existing stream corridors. No wetlands are present on the site. Site access will be from Monticello Road, Prairie Star Parkway and 91 st Street. A project location map follows as Figure

8 K-7 LONE ELM Preferred Alternative W N E 83RD S Site 4 Site 3 MONTICELLO 91ST Site 6 Site 2 PRAIRIE STAR Site 1 K-10 Watershed Boundary Parcels Stream Classification AA-TYPE2 (Higher Quality) AA-TYPE3 AA-TYPE4 AA-TYPE5 (Low Quality) Alternative E (option 2) Flood Pools Alternative E (option 2) Permanent Pools New Monticello Road Road Centerlines Buildings Existing Storage 10-foot Contours Feet Figure 1 Location Map 1-2

9 2.0 Site Evaluation The following sections describe existing conditions at the site. 2.1 Topography and Drainage The project site is a lowland area located within the Central Lowland province of the Interior Plains. Site topography is very hilly with drainage direction being generally to the north east. Storm drainage through the project area begins as sheet flow near the tops of the hills and ends with concentrated channel flow in the streams that run through the project site The existing area is mix of residential land use, abandoned pasture land, and native forested areas within the project area. 2.2 Soils Based on the Soil Survey of Johnson County (USDA, 1979), there are a variety of soils types within the project area. The hillsides are predominantly Polo Silt Loam, Oska-Martin silty clay loam, and Vinland-Rock outcrop complex. The valleys are primarily comprised of Kennebec silt loam, Martin silty clay loam, and Sogn-Vinland complex. The soils are derived from the parent bedrock material that consist of shales and limestones. A geologic profile for the project area is shown in Figure 2. Fill material for the lake and wetland dams will be taken from soils present in the basins of the lake and wetland facilities. 2.3 Climate The climate of the area is considered continental with common fluctuations in temperature and precipitation. The winter daily average is 32.3 degrees F., while the summer average temperature is 76.0 degrees F. Annual precipitation averages nearly inches with inches falling between April and September. The average annual snowfall is 19.0 inches. 2.4 Runoff Water Quality No long-term surface water quality data is available from the site. A water quality monitoring plan was developed for the City as part of the watershed management plan. The City has since implemented the monitoring plan and has some limited preliminary data. Due to the field nature of the site, runoff could be expected to contain significant amounts of suspended solids. 2.5 Receiving Stream Site runoff flows to the east and west branches of Coon Creek. Coon Creek flows northeasterly through the Whispering Hills subdivision to its confluence with Mill Creek near 83 rd Street. 2-1

10 Figure 2 Geologic Cross-Section 2-2

11 3.0 Site Construction Plan The following sections describe the proposed facility and site construction plan. 3.1 Construction Activities The proposed facilities will be constructed to manage flooding to the Whispering Hills subdivision located downstream of proposed lake, and to improve water quality and protect and enhance habitat in the Coon Creek watershed. The site will require earthwork to construct the lake and wetland dams and lake fisheries structures. Soil disturbing activities will include: grubbing, rough grading, excavating, filling, and final grading. Monticello Road, Prairie Star Parkway, Lone Elm Road, and 91 st Street will be used during construction for access to the construction area. The energy dissipation facilities for each of the wetlands and one stream restoration project will function as temporary erosion and sediment control facilities. Rock check dams with perforated pipe outlets and a sedimentation pool will be used to capture sediment-laden water in the streams. Silt fence or other suitable erosion and sediment control facility will be used to capture sediment leaving the site outside of the stream. In addition, the project contractor will be required to utilize acceptable erosion and sediment control facilities on any waterway leaving the project site that does not pass through the primary erosion and sediment control facilities. Any disturbed area that will be left dormant for more than 14 days will be temporarily seeded. A record of the site construction activities must be maintained as part of this Plan. Appendix A includes a form and instructions to record such information on an ongoing basis. 3-1

12 4.0 Storm Water Management Plan This storm water management system was designed following EPA guidelines. Control of site runoff will be the main means of storm water management. Storm water controls will be installed prior to construction. 4.1 General Description of Storm Water Management System The potential for storm water runoff pollution will be present during project construction. This risk will be minimized through the use of several control measures implemented during the construction sequence. The storm water management system was designed in accordance with the EPA's guidance document entitled Storm Water Management for Construction Activities - Developing Pollution Prevention Plans And Best Management Practices (EPA 832-R , September 1992). Detention is the main means of storm water management. Storm water control measures are described and shown on Figure 3 through Figure 6. These drawings are also part of the construction plans. It will be the responsibility of the Construction Manager to revise the Erosion and Sediment Control plan sheets, if the location or types of control measures indicated are changed in the field. These documents will supercede the figures shown in this plan. 4.2 Peak Flows This project will not impact the impervious area of the watershed. As a result, the peak flows will remain unchanged as well. As part of the project design, peak flows were calculated for existing and future developed conditions for the watershed. All facilities were designed to convey the future developed condition flows. 4.3 Stabilization Practices Temporary and permanent stabilization methods will be used within the project area. Two major practices include preserving existing vegetation where possible, and disturbing only the area needed to construct the facilities. Disturbed portions of the site will be stabilized within 14 days after construction activity has temporarily or permanently ceased, with two exceptions: snow cover precludes construction, or construction will resume within 21 days. Stabilization practices may include temporary or permanent seeding, mulching, geotextiles, sodding, or aggregate surfacing. Site access facilities (entrances/exits, parking or equipment laydown areas) will be aggregate surfaced to reduce sediment tracking. Stockpile and spoil areas will also be seeded. 4-1

13 Figure 3 Monticello lake Erosion & Sediment Control 4-2

14 Figure 4 East Wetland Sediment & Erosion Control 4-3

15 Figure 5 North Wetland Erosion & Sediment Control 4-4

16 Figure 6 South Wetland Erosion & Sediment Control 4-5

17 4.4 Structural Practices Temporary and permanent structural devices to divert, store, or limit runoff from disturbed areas will be used at the project site. Such devices may include silt fences, sediment traps, straw bale dikes, drainage swales, or culvert inlet/outlet protection (rock or rip-rap). Details of the structural control measures are shown in Figure 7 through Figure Outfall Structure Location The outfall locations for each of the facilities are located at the same location as the primary erosion and sediment control facilities. 4-6

18 Figure 7 Erosion and Sediment Control Details 4-7

19 Figure 8 Erosion & Sediment Control Details 4-8

20 Figure 9 Erosion & Sediment Control Details 4-9

21 5.0 Potential Storm Water Pollutant Sources and Control Measures Pollutants from various sources have the potential to enter the storm water system during project construction. A description of these potential pollutants and control measures to reduce the risk of storm water contamination is provided below. 5.1 Construction Silt and Dust The lake dam, wetlands and stream restoration projects will be constructed in this area with access road to Monticello Road, Prairie Star Parkway, Lone Elm Road and 91 st Street. Site earthwork will generate silt and fugitive dust. Silt barriers (fences) will be installed in the floodplain and upland areas located downstream of the disturbance limits of each wetland, the main lake facility, and the stream restoration project located east of Lone Elm Road. The silt barrier will be installed prior to the clearing and grubbing necessary for floodwall construction. The silt barrier will remain in place until the construction sites are stabilized. If construction in a particular area will cease temporarily, temporary soil stabilization will be implemented no more than 14 days after the construction has ceased unless activity will resume in that area within 21 days. Permanent stabilization will take place no later than 14 days after construction activities have permanently ceased in an area. Fugitive dust may be generated during dry weather conditions. Dust control will be directed by the Construction Manager and implemented by the Contractor. Water sprays will be used for dust control. 5.2 Offsite Sediment Tracking Monticello Road, Prairie Star Parkway, Lone Elm Road, 91 st Street and other local roads adjacent to the site will be kept relatively free of excess mud, dirt, and rock tracked from the site. Site access roads will be aggregate surfaced to reduce offsite sediment. 5.3 Petroleum Products Construction equipment will require diesel fuel and oil on a regular basis. The potential exists for spills or leaks. All onsite vehicles will be monitored for leaks and receive regular preventative maintenance to ensure proper operation and reduce the chance of leaks. No "topping off" of gas tanks will be allowed to reduce the possibility of spills. Vehicle refueling and maintenance will occur in a designated, contained area. Petroleum products will be stored in clearly labeled and tightly sealed containers or tanks. Any asphalt used onsite will be applied according to the manufacturer's recommendations. 5-1

22 Any soil contaminated by fuel or oil spills will be removed and disposed of by the Contractor to an approved disposal site. 5.4 Sanitary Wastes All sanitary wastes will be collected from the portable units by a licensed sanitary waste management contractor. The units will be maintained on a regular basis. 5.5 Hazardous Materials All hazardous materials and wastes will be stored and disposed of in the manner specified by local or state regulation or manufacturer. Site personnel will be instructed of these procedures and the Construction Manager will be responsible for implementing these practices. 5.6 Fertilizers Fertilizers will be applied as recommended by the manufacturer. Once applied, the fertilizer will be worked into the soil to limit exposure to storm waters. Fertilizers will be stored in a covered area or in water tight containers. Any partially used bags or containers will be properly sealed and stored to avoid spills or leaks. 5.7 Paints All containers will be tightly sealed and properly stored to prevent leaks or spills. Excess paint will not be discharged to the storm water system. Unused paints will be disposed of according to local or state regulations or the manufacturer's guidelines. Spray painting will not occur on windy days, and a drop cloth will be used to collect and dispose of drips and overspray. 5.8 Concrete Trucks Concrete trucks will be allowed to discharge surplus concrete or drum wash water on the site in such a manner that prevents contact with storm waters discharged from the site. Dikes or barriers will be constructed around such an area to contain these materials until stable, at which time the materials will be disposed of in the proper manner. 5.9 Waste Materials All construction waste material will be collected and stored in metal dumpsters from a licensed solid waste management contractor. All trash and construction debris will be deposited in the dumpsters. No construction waste will be buried onsite. Any burning will be conducted in accordance with local or state regulations. All site personnel will be instructed by the Construction Manager of the proper waste disposal procedures. 5-2

23 5.10 Allowable Non-Storm Water Discharges The following sources of non-storm water discharges may be combined with storm water discharges from project construction activities. Waters used to wash vehicles or to control dust. Pavement washwaters not containing toxic or hazardous substances. Uncontaminated dewatering discharges. Fire fighting waters. Vegetation watering. Potable or spring water discharges. 5-3

24 6.0 Best Management Practices Chemicals, petroleum products, and other materials will be used and stored at the construction site. Best Management Practices, such as good housekeeping measures, inspections, containment, and spill prevention practices will be used to limit contact between storm water and potential pollutants. 6.1 Good Housekeeping The good housekeeping practices listed below will be followed to reduce the risk of potential pollutants entering storm water discharges. All construction personnel will be responsible for monitoring and maintaining housekeeping tasks, or notifying the appropriate person of a problem. Store only enough product required to do the job. Store all materials in a neat and orderly manner in the appropriate containers and, if possible, under a roof or within an enclosure. Keep products in the original container with the original manufacturer's label. Do not mix products unless recommended by the manufacturer. Use all of a product before disposing of the container. Use and dispose of products according to the Construction Manager's direction or manufacturer's recommendations. Perform regular inspections of the storm water system and the material storage areas. When and where appropriate, use posters, bulletin boards, or meetings to remind and inform construction personnel of required procedures. 6.2 Hazardous Products Storage areas for hazardous materials such as oils, greases, paints, fuels, and chemicals, must be provided with secondary containment to ensure that spills in these areas do not reach wetlands or waters of the State. Contingencies for the proper disposal of contaminated soils shall be established (use of licensed hauler, approved landfill) early in the construction period. 6.3 Spill Prevention and Response In addition to the housekeeping and hazardous materials storage procedures described above, spill prevention and cleanup practices will be as follows. Construction personnel will be informed of the manufacturer's recommended spill cleanup methods, and the location of that information and cleanup supplies. Materials and equipment for the cleanup of small spills (<100 gal) will be kept in the materials storage area. These facilities may include brooms, rags, gloves, shovels, goggles, sand, sawdust, plastic or metal trash containers, and protective clothing. All containers will be labeled, tightly sealed, and stacked or stored neatly and securely. 6-1

25 Spill response procedures will be as follows. Step 1. Upon discovery of a spill; stop the source of the spill, if safe. Step 2. Cease all spill material transfer until the release is stopped and waste removed from the spill site. Step 3. Initiate containment to prevent spill from reaching State waters. Step 4. Notify a Supervisor or the Construction Manager of the spill. Step 5. The Construction Manager will coordinate further cleanup activities. Step 6. Any significant spill of toxic or hazardous material will be reported to the appropriate state and/or local agencies at the following numbers: National Response Center State Contacts: KDHE (Days) (Evenings and weekends) Adjutant General Local Contacts: Johnson County Environmental Department Police and Fire 911 Step 7. Review the storm water pollution prevention plan and amend if needed. Record a description of the spill, cause, and cleanup measures taken. 6-2

26 7.0 Inspection, Maintenance and Record Keeping Procedures Site inspection and facility maintenance are important features of an effective storm water management system. Qualified personnel will inspect disturbed areas of the site not finally stabilized, storage areas exposed to precipitation, all control measures, and site access areas to determine if the control measures and storm water management system is effective in preventing significant impacts to receiving waters. 7.1 Erosion and Sediment Controls The following procedures will be used to maintain erosion and sedimentation controls. All control measures will be inspected at least once a week and after any storm event of 1/2 inch or more. All measures will be maintained in good working order; if a repair is necessary, that repair will be initiated within 24 hours of the report. Sediment will be removed from the silt barriers when it has reached one-third of the height of the barrier. Silt barriers will be inspected for depth of accumulated sediment, tears, attachment to posts, and stability on a weekly basis. Temporary and permanent seeding and planting will be inspected for bare spots, washouts, and healthy growth. Inspect rip-rap and aggregate covered areas for bare spots and washouts. The Construction Manager will select individuals to be responsible for inspections, maintenance, repairs, and reporting. The designated inspectors will receive the necessary training from the Construction Manager to properly inspect and maintain the controls in good working order. An Inspection Form (Form 1) will be completed after each inspection. The completed Inspection Forms will be kept with this Plan in Appendix B. 7.2 Non-Storm Water Controls The following procedures will be used to maintain the non-storm water controls. All control measures will be inspected at least once a week and after any storm event of 1/2 inch or more. All measures will be maintained in good working order; if a repair is necessary, that repair will be initiated within 24 hours of the report. The Construction Manager will select individuals to be responsible for inspections, maintenance, repairs, and reporting. The designated inspectors will receive the necessary training from the Construction Manager to properly inspect and maintain the controls in good working order. An Inspection Form (Form 2) will be completed after each inspection. The completed Inspection Forms will be kept with this Plan in Appendix B. 7-1

27 7.3 Record Keeping Two inspection forms are provided on the following pages for recording inspections and maintenance of the control measures: Erosion and Sedimentation Controls (Form 1), and Non-Storm Water Source Controls (Form 2). All disturbed areas and materials storage areas require inspection at least every 7 days and within 24 hours of a 1/2 inch or more rainfall. After each inspection, the inspector completes an inspection report and inserts that report in Appendix B of this Plan. Any maintenance required is initiated within 24 hours of the inspection. A fully signed copy of this Plan and any supporting materials must be maintained at the construction site from the date of project initiation to the date of final stabilization. All records and supporting documents will be compiled in an orderly manner, and maintained for a period of three years following final site stabilization. The generation of reports, as part of the construction process and inspection or amendment procedures, provides accurate records which can be used to evaluate the effectiveness of this Plan and document compliance. Changes in design or construction of the storm water management system are documented and included with the Plan to facilitate Plan review or evaluation. Four forms have been developed to assist the Construction Manager with record keeping activities. Record of Plan Amendments Construction Activity Record Erosion and Sedimentation Controls Inspection Form Non-Storm Water Source Controls Inspection Form Plan amendments are documented on the form in the front of this Plan and on the drawings. A record of construction activities is maintained in Appendix A of this Plan. Completed inspection and maintenance forms are kept in Appendix B of this Plan. 7-2

28 Inspection Form 1 Erosion and Sedimentation Controls Visually inspect disturbed areas of the construction site that have not been finally stabilized. Inspections are to be completed every 7 days and within 24 hours of a rainfall event of 1/2 inch or more. Maintenance is to be performed within 24 hours of inspection. Inspector: Inspection Date: Date of last rainfall: Amount of last rainfall: inches Report on the condition of the erosion and sedimentation controls installed at the construction site. Check for tears in silt barriers, for securely attached fabric to fence posts, and for depth of sediment in front of the silt barriers. The depth of sediment should not exceed one-third of the barrier height. Seeding/planting areas and rip-rap/aggregate areas should be inspected for bare spots and washouts. Area Condition of Control Maintenance Required/Completion Date

29 Inspection Form 2 Non-Storm Water Source Controls Visually inspect material storage and construction areas. Inspections are to be completed every 7 days and within 24 hours of a rainfall event of 1/2 inch or more. Maintenance is to be performed within 24 hours of inspection. Inspector: Inspection Date: Date of last rainfall: Amount of last rainfall: inches Construction Dust - Is there excessive dust at the site that requires watering? Sediment Tracking - Are the County roads mostly free from mud, dirt, or rock? Is washdown required? Are graveled areas adequately covered? Petroleum/Chemical Products - Are spill containment structures secure? Product containers securely sealed? Sanitary Waste - Do portable sanitary units need service? Hazardous Waste - Are hazardous wastes stored and disposed of in compliance with state and local regulations?

30 Inspection Form 2 Non-Storm Water Source Controls (Continued) Construction Waste - Are all construction waste materials collected and stored in approved dumpsters? Material Storage Areas Exposed to Precipitation - Are materials handled and stored in a manner to prevent leakage and prevent pollutants from entering the storm water system? Other Non-Storm Water Discharges - Are waters from line flushing, pavement washdown, and dewatering directed to the storm water system prior to discharge? Maintenance Required Maintenance Completed Date

31 8.0 Certification of Compliance This Storm Water Pollution Prevention Plan reflects best management practices and erosion and sedimentation control measures for storm water management as recommended by the Environmental Protection Agency. 8.1 Contractor Certifications The Contractor Certification forms provided in this section indicate that each contractor working on the project site understands the terms, conditions, and intent of this NPDES General Permit for Storm Water Discharges Associated with Construction Activity and will implement the measures described in this Plan appropriate to his area of work

32 Contractor/Subcontractor Certification I certify, under penalty of law, that I understand the terms and conditions of the National Pollutant Discharge Elimination System (NPDES) General Permit that authorizes storm water discharges associated with construction activity from the site identified as part of this certification. Date Name/Title Firm Address Phone Nature of Contracted Service Construction Area(s)

33 Contractor/Subcontractor Certification I certify, under penalty of law, that I understand the terms and conditions of the National Pollutant Discharge Elimination System (NPDES) General Permit that authorizes storm water discharges associated with construction activity from the site identified as part of this certification. Date Name/Title Firm Address Phone Nature of Contracted Service Construction Area(s)

34 9.0 Project Completion Construction is considered complete when the site is 70 percent (density) stabilized. The City of Olathe may terminate the permit at this time. A Notice of Termination should be submitted to KDHE requesting termination of the General Permit. A suggested transmittal letter and partially completed Notice of Termination form are included in this section. Permanent storm water control measures incorporated into the project design include vegetated swales, and culvert inlet/outlet protection. Date Kansas Department of Health and Environment Bureau of Water Forbes Field, Building 283 Topeka, KS Gentlemen: The City of Olathe, Kansas, has completed construction of the Cedar Creek Wastewater Treatment Plant Flood Protection Project in 2003, and the construction site is now 70 percent stabilized. The City, therefore, submits the enclosed Notice of Termination requesting termination of General Permit. Very truly yours, Tom A. Jacobs, P.E. Stormwater Engineer 9-1

35 Appendix A Construction Activity Record 9-1

36 Construction Activity Record An accurate and up-to-date record of construction activity must be maintained as a part of this Plan. Record the information below on an ongoing basis. Dates when major soil disturbing activities occur. Dates when construction activities temporarily cease on a portion of the site. Dates when construction activities permanently cease on a portion of the site. Dates when stabilization measures are initiated. Date Activity 9-2

37 Construction Activity Record (Continued) Date Activity 9-3

38 Appendix B Completed Inspection Forms 9-4

39 Appendix C Construction Permit Language 9-5