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HomeMy WebLinkAboutFULLO&M Manual-11180 Westfield Blvd REV 02.05.2021OPERATIONS AND MAINTENANCE MANUAL FOR BMP at Story Development Plot Plan 11180 Westfield Blvd. Carmel, IN 46032 Prepared: December 18, 2020 Prepared by: CrossRoad Engineers, P.C. 3417 Sherman Drive Beech Grove, IN 46107 phone: (317) 780-1555 fax: (317) 780-6525 email: info@crossroadengineers.com 2 TABLE OF CONTENTS BMP OWNER/CONTACT INFORMATION ...................................................................3 BMP LOCATION AND DESCRIPTION .......................................................................3 MAINTENANCE AND INSPECTION GUIDELINES ..........................................................3 ROUTINE MAINTENANCE ........................................................................................ 4 REMEDIAL MAINTENANCE ....................................................................................... 4 BMP INSPECTION .............................................................................................. 5 STATEMENT OF COMPLIANCE .............................................................................6 APPENDIX A ..................................................................................................8 BMP SITE DRAWINGS .......................................................................................... 8 APPENDIX B ...................................................................................................9 MAINTENANCE PLAN AND INSPECTION FORMS ................................................................... 9 APPENDIX C ................................................................................................. 10 CONTECH CASCADE SEPARATOR CS-4 INFORMATION .......................................................... 10 3 BMP Owner/Contact Information C Morgan 11180 WESTFIELD LLC PO Box 4342 Carmel, IN 46032 Phone: (317) 223-8563 Email: 11180westfieldblvd@gmail.com The BMP Owner is responsible for all costs associated with the maintenance and inspection of all BMPs as required by the City of Carmel. BMP Location and Description The proposed project includes the construction of a BMP treatment train system. A dry detention pond with plantings with a stone trench along the pond bottom and a Contech Cascade Separator CS-4 online mechanical treatment unit are being utilized as the stormwater BMP for the development of 11180 Westfield Blvd. plot plan project. The dry detention pond is located on the eastern portion of the site. The Contech Cascade Separator CS-4 mechanical unit is located at the northwest corner of the dry detention pond. Storm sewer infrastructure including drain basins and storm sewer pipe convey runoff to and from the dry detention pond. The dry detention pond shall provide stormwater quantity treatment for the site. The following information addresses the proper inspection and maintenance of the dry detention pond. Please refer to Appendix A: “BMP Site Drawings” for the dry pond details and Appendix B: “Maintenance Plan and Inspection Forms”. The Contech Cascade Separator CS-4 unit shall remove pollutants from the runoff before conveying the treated water to the detention facility. Please refer to Appendix C: “Contech Cascade Separator CS-4 Information” for the Contech Cascade Separator CS-4 details and for the Contech Cascade Separator CS-4 O&M Manual. The dry detention pond shall also have plantings and a stone trench installed along the bottom of the pond to act as a secondary post-construction BMP. The intent is for the installed plantings to naturalize and provide water quality benefit via infiltration and naturalization. The following operations and maintenance information shall be utilized to properly inspect and maintain the detention pond and storm sewer infrastructure. Maintenance and Inspection Guidelines Maintenance and inspection as described below is the responsibility of the BMP owner. Any additional procedures deemed necessary by annual City inspections shall be incorporated into these guidelines. 4 Routine Maintenance The owner shall be responsible for the following minimum operations for maintaining the BMPs, in addition to maintaining and updating the BMP Operations and Maintenance Manual per the City of Indianapolis requirements: Dry Detention Pond  Removal of debris and litter from the dry basin, inlet and outlet structures, emergency spillway, pond outfall and Contech Cascade Separator CS-4 mechanical treatment unit  Mowing and/or trimming appropriate vegetation from detention pond side slopes. All clippings should be removed and properly disposed of.  Maintaining access to detention ponds via drainage and utility easements  Maintain and update the BMP Operations and Maintenance Manual as necessary.  Removal of sediment from dry basin, to be performed biannually. Storm Sewer Infrastructure  Remove trash and debris from inlet castings  Remove trash and debris from inside of any storm structures  Remove sediment deposits from structures and pipes when accumulated depth reaches 1/4 of pipe diameter  Remove debris from inlet and outlet structures Swales and Ditches  Mow and maintain vegetation to a maximum height of 5 inches  Maintain swales with uniform slopes and unobstructed by buildings and fences  Remove trash and debris from swales  Grade and reseed eroded areas Remedial Maintenance The owner shall be responsible for correcting and/or replacing any portions of the BMP and/or storm sewer infrastructure in unsatisfactory condition. This includes, but is not limited to:  Replacing end sections at all pond inlets and outlets  Replacing any portion of damaged storm sewer or underdrain pipes  Grading and reseeding eroded areas  Replacing riprap as necessary at the pond emergency spillway and pipe inlet locations 5 BMP Inspection Annual inspections of permanent BMPs shall be performed by the City. Routine inspections are the responsibility of the BMP owner. These inspections shall be accomplished as scheduled below: MAINTENANCE ITEM INSPECTION SCHEDULE Embankment and Emergency Spillway Annually and After Major Storms Contech Cascade Separator CS-4 Mechanical Treatment Unit Quarterly and After Major Storms Basin Side Slopes and Bottoms Quarterly and After Major Storms Storm Inlets, Pipes, and Swales Monthly and After Major Storms Pond Outlet and Principal Spillway Annually Miscellaneous Monthly Pond Sediment Removal Biannually The approved maintenance plan and inspection forms provided in Appendix B shall be used as guidance for performing maintenance and inspections activities. These forms shall be completed and retained by the BMP owner and produced upon request by the City. The City shall be notified of any changes in BMP ownership, major repairs, or BMP failure in writing within 30 days. Furthermore, an annual inspection report shall be submitted to the City of Carmel. Notification shall be addressed to: City of Carmel – Department of Engineering Attn: Stormwater Administrator One Civic Square Carmel, IN 46032 In the event that the City finds a BMP in need of maintenance or repair, the City will notify the BMP owner of the necessary maintenance or repairs and give the landowner a timeframe for completing the maintenance or repairs. If the maintenance or repairs are not completed within the designated timeframe, the City shall perform the repairs or maintenance and bill the landowner for the actual costs for the work. 6 Statement of Compliance I hereby certify that I am the ______________________________ and duly authorized agent of (title) ___________________________, and that I have read the preceding manual and shall comply (company/agency) with all terms and requirements stated herein. I understand that this BMP O&M Manual has been created per requirements of the City of Indianapolis Stormwater Design and Construction Specifications Manual. I recognize that it shall be the right of the City and authorized representatives to enter the property containing the BMP for maintenance and inspection purposes, and that this access shall be granted without hindrances by means of the utility and drainage easement previously described in this manual. _______________________________________________ (printed name) _______________________________________________ ____________________ (signature) (date) Owner Acknowledgement Agreement (“Agreement”) For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned owner (“Owner”) hereby submits this Operation and Maintenance Manual (“Manual”) to the City of Carmel, Indiana (“City”) as a written acknowledgement of Owner’s warranty and agreement to institute, maintain, and follow the water quality Best Management Practices (“BMPs”) listed below, and to follow and abide by the inspection schedule and maintenance activities listed in this Manual. The Owner also hereby agrees to provide, at Owner’s cost, all additional maintenance, repair, and/or replacement services reasonably necessary to maintain the function and longevity of the BMPs from and including the date this Agreement is executed by Owner to and including the date on which a new Agreement is filed with the City by another party who assumes all of the obligations and responsibilities of Owner as set forth herein. BMPs: ___________________________________________________ ___________________________________________________ ___________________________________________________ _______________________________ ________________________ Owner Signature Date _______________________________ ______________________________ Printed Name Company STATE OF INDIANA ) ) SS: COUNTY OF HAMILTON ) BEFORE ME, the undersigned, a Notary Public in and for said County and State, personally appeared _________________________________ Owner subscribed and sworn before this ____ day of __________________, ________. ______________________________ ______________________________ County of Residence Signature ______________________________ Commission Expiration Date ______________________________ Printed Name 8 APPENDIX A BMP Site Drawings STORY CUSTOM DEVELOPMENT PLOT PLAN 11180 WESTFIELD BLVD. EXHIBIT 1 - LOCATION AND VICINITY MAPS LOCATION MAP VICINITY MAP DEVELOPMENT CONSULTANTS TRANSPORTATION & BEECH GROVE, IN 46107 3417 SHERMAN DRIVE (317) 780-1555 CROSSROADENGINEERS.COM DECEMBER 17, 2020 PROJECT NORTH NORTH LOCATION PROJECT LOCATION 8x8 WOOD POST 8x8 WOOD POST BRICK VENEER ABOVE 10" CMU AND BRICK LEDGE INDICATED WITH GRAY FILL BRICK VENEER ABOVE 10" CMU WITH BRICK LEDGE INDICATED WITH GRAY FILL 2'-4" x 2'-4" CMU PIER W/ 4" BRICK LEDGE (TYP.) LINE OF BEARING WALL ABOVE FOOTING CMU FOUNDATION WALL 12x12 CMU 12x12 CMU LINE OF BEARING WALL ABOVE 2'-4" x 2'-4" CMU PIER W/ 4" BRICK LEDGE (TYP.) SHOWER LOCATION - RECESS SLAB. COORDINATE SIZE AND DEPTH WITH ACRYLIC SHOWER PAN MANUFACTURER. ALIGN N88°44'50"W 400.08' N00°48'09"E 125.28' S88°18'45"E 399.95' S00°43'35"W 122.24' WESTFIELD BLVD. FUTURE 45' HALF R/W (TO BE DEDICATED) STORY CUSTOM DEVELOPMENT PLOT PLAN 11180 WESTFIELD BLVD EXHIBIT 2: OVERALL SITE PLAN NORTH DEVELOPMENT CONSULTANTS TRANSPORTATION & BEECH GROVE, IN 46107 3417 SHERMAN DRIVE (317) 780-1555 Development Consultants Transportation & STORY CUSTOM DEVELOPMENT PLOT PLAN 11180 WESTFIELD BLVD. EXHIBIT 3: POND AND OUTLET STRUCTURE DETAILS OUTLET STRUCTURE (STR. NO. 5) DETAIL BASIN OVERFLOW ROUTE DETAIL DRY DETENTION BASIN DETAIL 9 APPENDIX B Maintenance Plan and Inspection Forms Outlet Control Structures 1. Low & High Flow Orifice 2. Trash Present A. Location B. Corrosion 3. Excessive Sediment Buildup 4. Concrete/Masonry Condition A. Cracks or Displacement B. Spalling 5. Outlet Pipe Condition 6. Outfall Channel Functioning 7. Other (Describe) Storm Sewer Structures w/ Sumps 1. Sediment/Trash Present 2. Concrete/Masonry/PVC Condition A. Cracks or Displacement B. Spalling 3. Inlet/Outlet Pipe Conditions 4. Other (Describe) Vegetated Native Dry Detention Facilities & Vegetated Swales 1. Encroachment Into Basin A. Location B. Describe 2. Erosion Present A. Location B. Describe 3.Trash/Debris Present A. Location B. Describe 4. Vegetation A. Condition B. Invasive Species Presence C. Describe 5. Sediment Buildup Maintenance Item Operation, Maintenance, and Management Inspection Checklist for BMP Owners 11180 Westfield Blvd Owner Name & Address: Phone Number: Site Status: Date: Time: Inspector: Satisfactory/ Unsatisfactory Comments Embankment & Emergency Spillway 1. Leaks/Seeps A. Location B. Describe 2. Trash/Sediment/Debris Present A. Location B. Describe 3. Areas of Erosion A. Location 4. Vegetation 5. Animal Burrows 6. Drains Clear & Functioning 7. Spillway Clear of Obstructions Detention Ponds 1. Floatable Debris/Trash Present 2. Erosion Present A. Location B. Describe 3. Damaged Signage A. Location B. Describe 4. Vegetation A. Condition 5. Sediment Buildup 6. Visible Pollution Miscellaneous 1. Endsection Headwalls 2. Encroachment into Detention Areas 3. Complaints From Residents 4. Public Hazards (Describe) Additional Comments Actions to be Taken Maintenance Item Satisfactory/ Unsatisfactory Comments 10 APPENDIX C Contech Cascade Separator CS-4 Information (4'-0" [1219]) SOLIDS STORAGE SUMP INLET PIPE (MULTIPLE INLET PIPES MAY BE ACCOMMODATED) OUTLET PIPE VARIES B B 2'-3" [686] PLAN VIEW B-B NOT TO SCALE ELEVATION A-A NOT TO SCALE FIBERGLASS INTERNAL COMPONENTS FLOW CONTRACTOR TO GROUT TO FINISHED GRADE GRADE RINGS/RISERS A A 48" [1219] I.D. MANHOLE STRUCTURE TOP SLAB ACCESS (SEE FRAME AND COVER DETAIL) FLOW TOP OF CENTER CHAMBER (EXTENSIONS AVAILABLE AS REQUIRED) INLET PIPE(S) LOCATION MAY VARY WITHIN 260° PERMANENT POOL ELEVATION FRAME AND COVER (DIAMETER VARIES) NOT TO SCALE www.ContechES.com ® 800-338-1122 513-645-7000 513-645-7993 FAX 9025 Centre Pointe Dr., Suite 400, West Chester, OH 45069 CS-4 CASCADE SEPARATOR STANDARD DETAIL I:\COMMON\CAD\TREATMENT\21 CASCADE\40 STANDARD DRAWINGS\DWG\CS-4-DTL.DWG 1/22/2019 9:34 AM www.contechES.com CASCADE SEPARATOR DESIGN NOTES THE STANDARD CS-4 CONFIGURATION IS SHOWN. ALTERNATE CONFIGURATIONS ARE AVAILABLE AND ARE LISTED BELOW. SOME CONFIGURATIONS MAY BE COMBINED TO SUIT SITE REQUIREMENTS. CONFIGURATION DESCRIPTION GRATED INLET ONLY (NO INLET PIPE) GRATED INLET WITH INLET PIPE OR PIPES CURB INLET ONLY (NO INLET PIPE) CURB INLET WITH INLET PIPE OR PIPES GENERAL NOTES 1. CONTECH TO PROVIDE ALL MATERIALS UNLESS NOTED OTHERWISE. 2. FOR SITE SPECIFIC DRAWINGS WITH DETAILED STRUCTURE DIMENSIONS AND WEIGHT, PLEASE CONTACT YOUR CONTECH ENGINEERED SOLUTIONS LLC REPRESENTATIVE. www.ContechES.com Cascade Separator® Inspection and Maintenance Guide ENGINEERED SOLUTIONS Maintenance The Cascade Separator® system should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate at which the system collects sediment and debris will depend upon on-site activities and site pollutant characteristics. For example, unstable soils or heavy winter sanding will cause the sediment storage sump to fill more quickly but regular sweeping of paved surfaces will slow accumulation. Inspection Inspection is the key to effective maintenance and is easily performed. Pollutant transport and deposition may vary from year to year and regular inspections will help ensure that the system is cleaned out at the appropriate time. At a minimum, inspections should be performed twice per year (i.e. spring and fall). However, more frequent inspections may be necessary in climates where winter sanding operations may lead to rapid accumulations, or in equipment wash-down areas. Installations should also be inspected more frequently where excessive amounts of trash are expected. A visual inspection should ascertain that the system components are in working order and that there are no blockages or obstructions in the inlet chamber, flumes or outlet channel. The inspection should also quantify the accumulation of hydrocarbons, trash and sediment in the system. Measuring pollutant accumulation can be done with a calibrated dipstick, tape measure or other measuring instrument. If absorbent material is used for enhanced removal of hydrocarbons, the level of discoloration of the sorbent material should also be identified during inspection. It is useful and often required as part of an operating permit to keep a record of each inspection. A simple form for doing so is provided in this Inspection and Maintenance Guide. Access to the Cascade Separator unit is typically achieved through one manhole access cover. The opening allows for inspection and cleanout of the center chamber (cylinder) and sediment storage sump, as well as inspection of the inlet chamber and slanted skirt. For large units, multiple manhole covers allow access to the chambers and sump. The Cascade Separator system should be cleaned before the level of sediment in the sump reaches the maximum sediment depth and/or when an appreciable level of hydrocarbons and trash has accumulated. If sorbent material is used, it must be replaced when significant discoloration has occurred. Performance may be impacted when maximum sediment storage capacity is exceeded. Contech recommends maintaining the system when sediment level reaches 50% of maximum storage volume. The level of sediment is easily determined by measuring the distance from the system outlet invert (standing water level) to the top of the sediment pile. To avoid underestimating the level of sediment in the chamber, the measuring device must be lowered to the top of the sediment pile carefully. Finer, silty particles at the top of the pile typically offer less resistance to the end of the rod than larger particles toward the bottom of the pile. Once this measurement is recorded, it should be compared to the chart in this document to determine if the height of the sediment pile off the bottom of the sump floor exceeds 50% of the maximum sediment storage. Cleaning Cleaning of a Cascade Separator system should be done during dry weather conditions when no flow is entering the system. The use of a vacuum truck is generally the most effective and convenient method of removing pollutants from the system. Simply remove the manhole cover and insert the vacuum tube A Cascade Separator unit can be easily cleaned A vacuum truck excavates pollutants from the systems. in less than 30 minutes. Model Number Diameter Distance from Water Surface to Top of Sediment Pile Sediment Storage Capacity ft m ft m y3 m3 CS-3 3 0.9 1.5 0.5 0.4 0.3 CS-4 4 1.2 1.5 0.5 0.7 0.5 CS-5 5 1.3 1.5 0.5 1.1 0.8 CS-6 6 1.8 1.5 0.5 1.6 1.2 CS-8 8 2.4 1.5 0.5 2.8 2.1 CS-10 10 3.0 1.5 0.5 4.4 3.3 CS-12 12 3.6 1.5 0.5 6.3 4.8 Note: The information in the chart is for standard units. Units may have been designed with non-standard sediment storage depth. Cascade Separator® Maintenance Indicators and Sediment Storage Capacities 800.925.5240 www.ContechES.com SUPPORT • Drawings and specifications are available at www.ContechES.com. • Site-specific design support is available from our engineers. ©2020 Contech Engineered Solutions LLC, a QUIKRETE Company Contech Engineered Solutions LLC provides site solutions for the civil engineering industry. Contech’s portfolio includes bridges, drainage, sanitary sewer, stormwater, and earth stabilization products. For information, visit www.ContechES.com or call 800.338.1122 NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH’S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION. Cascade Separator Maintenance 08/20 ENGINEERED SOLUTIONS Cascade Separator® Inspection & Maintenance Log Cascade Model: Location: Date Depth Below Invert to Top of Sediment1 Floatable Layer Thickness2 Describe Maintenance Performed Maintenance Personnel Comments 1. The depth to sediment is determined by taking a measurement from the manhole outlet invert (standing water level) to the top of the sediment pile. Once this measurement is recorded, it should be compared to the chart in the maintenance guide to determine if the height of the sediment pile off the bottom of the sump floor exceeds 50% of the maximum sediment storage. Note: to avoid underestimating the volume of sediment in the chamber, the measuring device must be carefully lowered to the top of the sediment pile. 2. For optimum performance, the system should be cleaned out when the floating hydrocarbon layer accumulates to an appreciable thickness. In the event of an oil spill, the system should be cleaned immediately. down through the center chamber and into the sump. The system should be completely drained down and the sump fully evacuated of sediment. The areas outside the center chamber and the slanted skirt should also be washed off if pollutant build- up exists in these areas. In installations where the risk of petroleum spills is small, liquid contaminants may not accumulate as quickly as sediment. However, the system should be cleaned out immediately in the event of an oil or gasoline spill. Motor oil and other hydrocarbons that accumulate on a more routine basis should be removed when an appreciable layer has been captured. To remove these pollutants, it may be preferable to use absorbent pads since they are usually less expensive to dispose than the oil/water emulsion that may be created by vacuuming the oily layer. Trash and debris can be netted out to separate it from the other pollutants. Then the system should be power washed to ensure it is free of trash and debris. Manhole covers should be securely seated following cleaning activities to prevent leakage of runoff into the system from above and to ensure proper safety precautions. Confined space entry procedures need to be followed if physical access is required. Disposal of all material removed from the Cascade Separator system must be done in accordance with local regulations. In many locations, disposal of evacuated sediments may be handled in the same manner as disposal of sediments removed from catch basins or deep sump manholes. Check your local regulations for specific requirements on disposal. If any components are damaged, replacement parts can be ordered from the manufacturer. 3. CASCADE SEPARATOR WATER QUALITY STRUCTURE SHALL BE IN ACCORDANCE WITH ALL DESIGN DATA AND INFORMATION CONTAINED IN THIS DRAWING. CONTRACTOR TO CONFIRM STRUCTURE MEETS REQUIREMENTS OF PROJECT. 4. CASCADE SEPARATOR STRUCTURE SHALL MEET AASHTO HS20 LOAD RATING, ASSUMING EARTH COVER OF 0' - 2' [610], AND GROUNDWATER ELEVATION AT, OR BELOW, THE OUTLET PIPE INVERT ELEVATION. ENGINEER OF RECORD TO CONFIRM ACTUAL GROUNDWATER ELEVATION. CASTINGS SHALL MEET AASHTO M306 AND BE CAST WITH THE CONTECH LOGO. 5. CASCADE SEPARATOR STRUCTURE SHALL BE PRECAST CONCRETE CONFORMING TO ASTM C478 AND AASHTO LOAD FACTOR DESIGN METHOD. 6. ALTERNATE UNITS ARE SHOWN IN MILLIMETERS [mm ]. INSTALLATION NOTES A. ANY SUB-BASE, BACKFILL DEPTH, AND/OR ANTI-FLOTATION PROVISIONS ARE SITE-SPECIFIC DESIGN CONSIDERATIONS AND SHALL BE SPECIFIED BY ENGINEER OF RECORD. B. CONTRACTOR TO PROVIDE EQUIPMENT WITH SUFFICIENT LIFTING AND REACH CAPACITY TO LIFT AND SET THE CASCADE SEPARATOR MANHOLE STRUCTURE. C. CONTRACTOR TO INSTALL JOINT SEALANT BETWEEN ALL STRUCTURE SECTIONS AND ASSEMBLE STRUCTURE. D. CONTRACTOR TO PROVIDE, INSTALL, AND GROUT INLET AND OUTLET PIPE(S). MATCH PIPE INVERTS WITH ELEVATIONS SHOWN. ALL PIPE CENTERLINES TO MATCH PIPE OPENING CENTERLINES. E. CONTRACTOR TO TAKE APPROPRIATE MEASURES TO ASSURE UNIT IS WATER TIGHT, HOLDING WATER TO FLOWLINE INVERT MINIMUM. IT IS SUGGESTED THAT ALL JOINTS BELOW PIPE INVERTS ARE GROUTED. SITE SPECIFIC DATA REQUIREMENTS STRUCTURE ID WATER QUALITY FLOW RATE (cfs [L/s]) PEAK FLOW RATE (cfs [L/s]) RETURN PERIOD OF PEAK FLOW (yrs) RIM ELEVATION PIPE DATA: INVERT MATERIAL DIAMETER INLET PIPE 1 INLET PIPE 2 OUTLET PIPE NOTES / SPECIAL REQUIREMENTS: