Loading...
HomeMy WebLinkAboutOM ManualSWINLEY FOREST OPERATIONS & MAINTENANCE MANUAL BMP TYPE:ConTech Cascade CS-4 Extended Dry Detention BMP OWNER: Swinley Forest, LLC Contact Person: Mark Gradison 6330 East 75th Street, Suite 156 Indianapolis, IN 46250 Contact Phone Number: (317) 506-1037 Contact Email: mgradison@gradison.net PREPARED BY: Stoeppelwerth & Associates, Inc. Contact Person: Brian M. Brown, P.E., C.F.M. 7965 East 106th Street Fishers, Indiana 46038 Contact Phone Number: (317) 570-4704 Contact Email Address: bbrown@stoeppelwerth.com DATE PREPARED: June 25, 2025 “I affirm, under the penalties for perjury, that I have taken reasonable care to redact each social security number in this document, unless required by law.” ______________________________ Brian M Brown Cross-Reference is hereby made to the secondary play, recorded as Instrument Number _______________. OPERATIONS AND MAINTENANCE MANUAL SWINLEY FOREST JOB# 111895GBC TABLE OF CONTENTS OPERATIONS AND MAINTENANCE MANUAL PURPOSE AND BACKGROUND STORM WATER QUALITY CONTROL REQUIREMENTS INSPECTION AND MAINTENANCE REFERENCES APPENDIX A – BMP DESCRIPTIONS PURPOSE & BACKGROUND INSPECTION & MAINTENANCE ACTIVITIES EMERGENCY CONTACT INFORMATION REFERENCES APPENDIX B BMP LOCATION MAP DETAIL DRAWINGS APPENDIX C INSPECTION & MAINTENANCE CHECKLIST INVASIVE PLANT SPECIES APPENDIX D OWNER ACKNOWLEDGMENT AGREEMENT OPERATIONS AND MAINTENANCE MANUAL SWINLEY FOREST PURPOSE AND BACKGROUND Each year thousands of acres of Indiana land undergoes disturbance and/or is converted for the construction of subdivisions, commercial and industrial centers, highways, and other land uses. Agriculture and urban development are the two major types of land-disturbing activities in Indiana. Both are very important to the economic well being of the citizens of the state. Without proper planning and the wise selection of storm water management measures, these areas of soil disturbance are very vulnerable to accelerated erosion and sedimentation. Whenever vegetation is removed from the land’s surface, the soil becomes exposed to the erosive effects of wind and water. Although erosion is a natural process, it can be greatly accelerated by human action that disturbs the land’s surface. While it is true that the tons of soil eroded on agricultural lands is much greater, it has been proven that the amount of soil eroded on a per-acre basis can be many times greater on active construction sites. The loss of soil through erosion commonly results in the loss of good topsoil and the associated minerals and nutrients required for plant establishment and growth. Soil erosion not only causes on-site damage problems, but can also negatively impact water quality downstream through sediment pollution. It has been shown that sediment is the number one water quality pollutant by volume in Indiana. Sediment damage can take many forms. Sediment accumulation in wetlands can reduce their capacity to retain storm water and its value to wildlife. Sediment deposition in storm sewers can reduce their efficiency and capacity. Sediment and accompanying nutrients often reaches lakes and leads to algal blooms, a decrease in lake depth, and a decrease in the recreational and aesthetic value of the lake. In addition to erosion and sediment damage, the building of residential subdivisions, shopping centers, industrial parks, schools, recreational attractions, etc. can have a significant effect on the patterns and amounts of storm water runoff during and after construction takes place. This often leads to water quality degradation and more frequent flooding events. The final land use associated with many projects will also contribute to the discharge of pollutants. These pollutants will typically be generated by the activities that are associated with the final land use. It is important to practice effective storm water management and treatment of storm water runoff before, during, and after construction. Otherwise, the landowner and/or public may end up paying more for project reconstruction and replacement/maintenance of existing infrastructure. Furthermore, public environmental awareness demands that land users work with nature, and not against it, to protect Indiana’s land and water resources. There are many ways to minimize the impacts of urbanization and protect the integrity of Indiana’s natural resources. One method is through careful planning and inclusion of proven storm water management measures in a project’s construction and development plans. Careful planning can prevent or at the very least alleviate much of the damage caused by erosion and sedimentation and the pollutants that will be associated with the final land use. However, careful planning and incorporation of appropriate storm water quality measures into a project’s construction plans is not enough. These measures must be deployed and maintained on the site throughout all construction phases. (Indiana Storm Water Quality Manual, 2007) This manual provides engineers, developers, builders, contractors, government officials, and other with guidance on the inspection and maintenance of installed post-construction storm water quality measures for Swinley Forest. STORM WATER QUALITY CONTROL REQUIREMENTS BMP OWNER CONTACT INFORMATION Swinley Forest, LLC Contact Person: Mark Gradison 6330 East 75th Street, Suite 156 Indianapolis, IN 46250 Contact Phone Number: (317) 506-1037 Contact Email: mgradison@gradison.net The project site owner must submit to City of Carmel a Storm Water Pollution Prevention Plan (SWPPP) that would show the placement of appropriate BMP(s) specified in the City of Carmel Stormwater Technical Standards Manual. The noted BMP(s) must be designed, constructed, and maintained according to guidelines provided or referenced in the City of Carmel Stormwater Technical Standards Manual. It is the policy of the City of Carmel that the water quality management program be performance- based. To that end, a best management practice (BMP) approved for use in the City will be capable of meeting the Maximum Extent Practible (MEP) removal target for TSS whether the control be a single structure or a series of controls. In addition to TSS removal, a BMP must also be designed to store and treat the water quality volume (WQv). The water quality volume is the storage needed to capture and treat the runoff from the first inch of rainfall. INSPECTION AND MAINTENANCE It is essential that any approved BMP be properly inspected and maintained in order to assure the TSS removal performance. Therefore, an inspection and maintenance plan is required. The City encourages the use of a high-efficiency, low maintenance BMP(s) that has the potential for removal of multiple storm water pollutants. The City of Carmel will perform annual inspections of permanent BMP(s) to ensure compliance. Routine monthly and annual inspections are the responsibility of the BMP owner. The BMP owner shall be financially responsible for any maintenance or repairs required by the City and/or its representatives during the City ’s inspections. The City and/or its representatives have the right to enter the property to inspect the BMP(s). 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 BMP owner 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 maintenance or repairs and bill the BMP owner for the actual costs for the work. Annual inspection reports are required to be submitted to City of Carmel. The first report is due one year after construction is completed, with subsequent reports due each year within the same month of the initial report. If there are any deficiencies found during the inspection, these should be addressed. If the inspection report is not received within the month it is due, if there are deficiencies which were not included in the report, or if any deficiencies included in the report are not addressed in a timely manner, the BMP owner faces enforcement action from the City. REFERENCES 1. Indiana Storm Water Quality Manual - October 2007 2. City of Carmel Technical Standards Manual - June 2007 APPENDIX A BMP DESCRIPTIONS DRY DETENTION BASIN SWINLEY FOREST PURPOSE & BACKGROUND The BMP for Swinley Forest is a dry detention basin. Dry detention basins are constructed basins that collect, temporarily hold, and gradually release excess storm water from storm events. Detention is achieved through the use of an outlet control structure that regulates the rate of storm water outflow. Unlike wet ponds, dry detention basins are designed to drain completely between storm events, thereby attenuating peak flows associated with storm events. Dry extended detention basins are particularly effective at reducing downstream streambank erosion related to increased peak discharge associated with urbanization. Dry basins are usually designed to drain in less than 24 hours. Dry basins are limited in ability to retain sediment. Sediments that settle out are subject to resuspension. Dry extended detention basins are designed with a minimum retention time of 24 hours. Through careful design, dry extended detention basins can be effective at removing urban pollutants. Treatment is primarily achieved by the sedimentation process where suspended particles settle to the bottom of the basin. Based on this information, dry extended detention basins are the preferred option when choosing between an extended basin and a conventional dry basin. (Indiana Storm Water Quality Manual, 2007) INSPECTION & MAINTENANCE ACTIVITIES The performance of a dry detention pond is highly dependant on the inspection and maintenance of the basin. If the basin is not properly maintained, the ability to remove pollutants will decrease. The BMP owner agrees to the following monthly inspection program: Inspection Item Inspection Procedure 1. Vegetation  Some species of plants are considered invasive and should be eradicated within one month of discovery. Invasive species include reed canary grass (Phalaris arundinacea), purple loosestrife (Lythrum salicaria), common reed (Phragmites australis), and narrowleaf cattail (Typha angustifolia.). The Appendix contains photos of these four common invasive species.  If invasive volunteer trees appear, they should be documented for removal.  Landscaped area of the banks that are eroded or have exposed bare earth shall be restored to proper grade, stabilized and re-seeded with the appropriate native seed mixtures. 2. Floatable Pollutants  Remove all floatable debris.  Note visible pollution such as oily sheens, discoloration, and cloudy or muddy water.  Remove shoreline pollution such as trash or oily liquids.  Remove miscellaneous debris. 3. Erosion  Inspect inlet, outlet, headwall and endwall areas for erosion and undercutting. If erosion is occurring, additional scour protection measures will need to be employed.  Areas of severe erosion or other conditions that may constitute a public hazard should be corrected as soon as possible and prior to the next monthly inspection. 4. Outlet  All basin outlets shall be inspected and checked for debris and obstructions that disrupt the flow within the storm water management system. If any pipes are obstructed, they must be cleared. 5. Embankment  Animal burrows should be controlled or removed when present in densities that endanger the integrity of the embankment. Damage caused by animal burrows must be repaired as soon as possible. Any burrowing control effort will need to be carefully planned and executed to avoid negative impacts on adjacent habitats and wildlife. Such measures will be confined to the embankment. Animals that may be on concern are beavers and muskrat.  Inspect the slopes of the BMP for any sliding or displacement of scour protection. Please note location and describe failure. Maintenance responsibilities shall remain in effect for the life of the BMP from the date the construction is completed. Inspections must be documented on the inspection form included in this Operations and Maintenance Manual. Maintenance Item Maintenance Procedure 1. Vegetation Although the dry detention BMP is expected to develop into a system that will eventually require little or no vegetation maintenance, some vegetation maintenance will be required in the first 2 years following construction in order to give the new vegetation communities a chance to become well established. Precautionary measures must be taken to prevent invasive species from establishing. These species should be either physically removed or treated with herbicide by qualified plant maintenance professional. Physical removal is strongly preferred above the application of herbicide. If herbicide is used, it must be applied by State Chemists Office approved applicators and any application must be approved by the City of Carmel Utility Department prior to application. Replant or reseed vegetation when damaged, vandalized or removed in compliance to original planting specifications. 2. Mowing Plan If turf grass surrounds BMP, once established, turf grass height shall be maintained at a minimum height of four (4) inches to control weeds. Not more than ½ of the grass leaf shall be removed by the initial cuttingor subsequent cutting. Do not mow any live native herbaceous plant area. 3. Fertilizer No fertilizer is to be used unless soil testing has found specific deficiencies in nutrients. Herbicide and Pesticide Guidance Throughout the first year, treat any weeds, non-native or invasive species with glyphosate herbicide approved for use around water (Rodeo) by spot-spraying or other means that minimize incidental herbicide drift. Herbicide application should be conducted on, windless days so that the chemical does not spread or volatize. Re-seed and/or replant any die-back resulting from incidental treatment with herbicide. Pre-emergent herbicides to be used on upland areas adjacent to stormwater management BMPs and other native landscape areas without native seed, or at least one year following seed installation, consist of prodiamine herbicides such as Barricade. Pre-emergent herbicides shall not be applied to plantings located in standing water. All herbicides must be applied by State Chemists Office approved applicators and any application must be approved by the City of Carmel Utility Department prior to application. 4. Spill Response Plan The proposed land use will consist of single family residential houses. The pollutants and sources of each pollutant normally expected from these types of land uses are listed below:  Pollutant Source: Passenger vehicles, delivery vehicles, and trucks Type of Pollutant: Oil, gasoline, diesel fuel, any hydrocarbon associated with vehicular fuels and lubricants, grease, antifreeze, windshield cleaner solution, brake fluid, brake dust, rubber, glass, metal and plastic fragments, grit, road de-icing materials  Pollutant Source: Residence Type of Pollutant: Cleaning solutions or solvents, leaks from HVAC equipment, grit from roof drainage, aggregate or rubber fragments from roofing system  Pollutant Source: Roadway Type of Pollutant: Any pollutant associated with vehicular sources, grit from asphalt wearing surface, bituminous compounds from periodic maintenance (sealing, resurfacing and patching), pavement de-icing materials, wind-blown litter from off-site sources, and elevated water temperatures from contact with impervious surfaces  Pollutant Source: Lawn and landscape areas Type of Pollutant: Fertilizers, herbicides, organic material (leaves, mulch, grass clippings) and pesticides. EMERGENCY CONTACT INFORMATION City of Carmel Engineering Department - (317) 571-2441 City of Carmel Fire Department - (317) 571-2600 Hamilton County Surveyor’s Office - (317) 776-8495 Indiana Department of Environmental Management (IDEM) - (317) 232-8603 REFERENCES 1. Indiana Storm Water Quality Manual - October 2007 2. City of Carmel Stormwater Technical Standards Manual - June 2007 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 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. A vacuum truck excavates pollutants from the systems.A Cascade Separator unit can be easily cleaned 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 2.5 0.8 0.7 0.5 CS-5 5 1.3 3 0.9 1.1 0.8 CS-6 6 1.8 3.5 1 1.6 1.2 CS-8 8 2.4 4.8 1.4 2.8 2.1 CS-10 10 3.0 6.2 1.9 4.4 3.3 CS-12 12 3.6 7.5 2.3 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 APPENDIX B 85 1 846 85 0 84 9 84 8 84 7 845 844 84 7 84 6 84 5 84 4 84 3 846 845 8 4 4 8 4 2 LO T 1 MF F : 8 3 6 . 7 MA X . L O T CO V E R A G E : 10 , 0 0 0 s q . f t . LO T 2 MF F : 8 3 9 . 8 MA X . L O T CO V E R A G E : 11 , 0 0 0 s q . f t . LO T 4 MF F : 8 4 7 . 0 MA X . L O T CO V E R A G E : 15 , 0 0 0 s q . f t . 7' S P I L L W A Y @ 8 2 8 . 0 3 ' DR Y B A S I N 2- y r E L . 8 2 5 . 8 7 10 - y r E L . 8 2 6 . 7 6 10 0 - y r E L . 8 2 8 . 0 3 2' R I B B O N C U R B 2' R I B B O N CU R B 2' R I B B O N C U R B 2' R I B B O N CU R B 4' B E R M @ 8 3 0 ' 4' B E R M @ 8 3 0 ' ML A G : 8 3 0 . 5 MF P G : 8 3 0 . 5 ML A G : 8 2 6 . 0 MF P G : 8 2 6 . 0 ML A G : 8 2 6 . 0 MF P G : 8 2 6 . 0 ML A G : 8 3 4 . 8 MF P G : 8 3 4 . 8 ML A G : 8 2 6 . 0 MF P G : 8 2 6 . 0 ML A G : 8 3 7 . 8 MF P G : 8 3 7 . 8 MLAG:846.4 MFPG:846.4 ML A G : 8 2 6 . 0 MF P G : 8 2 6 . 0 MO N O N F A R M S C O N D O M I N I U M S Pl a t C a b i n e t 3 , S l i d e 6 5 1 In s t . N o . 2 0 0 5 0 0 0 3 9 3 4 5 MO N O N F A R M S C O N D O M I N I U M S Pl a t C a b i n e t 3 , S l i d e 6 5 1 In s t . N o . 2 0 0 5 0 0 0 3 9 3 4 5 Mo n o n F a r m s L a n e LO T 3 MF F : 8 4 4 . 9 MA X . L O T CO V E R A G E : 12 , 0 0 0 s q . f t . 8 4 3 84585 0 84 4 84 684784884 9 85 1 83 5 84 0 83 6 83 7 83 8 83 9 84 1 84 0 845 84 1 84 2842842 843844 838 839 8 3 5 8 3 2 832 833 834 8 3 6 837 830 831 8 3 2 8 3 0 8 3 5 83 1 8 3 2 8 3 3 8 3 4 8 3 6 837 8 3 5 8 3 6 8 3 7 838 8 3 5 84 0 836 8 3 7 8 3 8 8 3 9 84 1 8 4 2 8 4 0 84 1842842842843843843 84 3 843 843 8 4 3 8 4 3 843 84 0 82 5 830830 8 2 6 8 2 7 8 2 7 827828 829 829 8 2 9 82 9 835 840 83 6 837 838 839 8 4 1 84 2 84 3 84 4 FWF F W F F WF FWF FWF F W F F W F BMP Basin #403 2.45 Ac. CN=95.1 ToC=19.0 HYDRODYNAMIC SEPARATOR EXTENDED DRY DETENTION DYH E.T. E A C S S S LEGEND EXISTING STORM SEWER BASIN BREAKLINE PROPOSED STORM SEWER LAKE NORMAL POOL 0 GRAPHIC SCALE ( IN FEET ) 100'50'100' 1" = 100 FT DRAWN BY: CHECKED BY: FIELDWORK DATE: DATE DRAWN: PAGE OF SHEETS JOB NO. 111895GBC NES BMB 12/17/2024 1 1 BMP SIZING MAP SWINLEY FOREST OVERALL CARMEL HAMILTON CO, IN S T O E P P E L W E R T H A L W A Y S O N 7965 East 106th Street, Fishers, IN 46038-2505 phone: 317.849.5935 fax: 317.849.5942 2-YR EL: 825.87 10-YR EL: 826.76 100-YR EL: 828.04 TOP OF BANK EL: 830.00 1 33 1 3 1 5' BERM5' BERM 1.00% 2.92% BOTTOM EL: 824.00 6" SUB-SURFACE DRAIN 6" SUB-SURFACE DRAIN RISER OUTLET CONTROL STRUCTURE #401 OUTLET CONTROL STRUCTURE #401 TC EL: 827.95 DRY BASIN CROSS-SECTION ('A-A') SCALE: NONE STRUCTURE TO BE INSTALLED ON 6" COMPACTED #8 AGGREGATE 6"6" OUTLET CONTROL STR. #401 DETAIL SCALE: NONE INV EL: 818.00 12 " R C P CL A S S I I I NP EL:824.00 2.75" ORIFICE EL: 824.00 6" SUB-SURFACE DRAIN EL: 821.50 2-YR EL:825.87 10-YR EL:826.76 100-YR EL:828.04 6"x6" NOTCH EL: 827.45 TC EL:827.95 6"6" 30"x30" R-4215-C TOP OF BERM EL: 830.00 SPILLWAY EL: 828.04 3 1 3 1 8' WIDE SPILLWAY DRY BASIN SPILLWAY DETAIL SCALE: NONE (4 ' - 0 " [ 1 2 1 9 ] ) SOLIDS STORAGE SUMP INLET PIPE (MULTIPLE INLET PIPES MAY BE ACCOMMODATED) OUTLET PIPE VA R I E S BB 2' - 3 " [ 6 8 6 ] 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: \ C O M M O N \ C A D \ T R E A T M E N T \ 2 1 C A S C A D E \ 4 0 S T A N D A R D D R A W I N G S \ D W G \ C S - 4 - D T L . D W G 1/ 2 2 / 2 0 1 9 9 : 3 4 A M 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 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: APPENDIX C Post-Construction BMP Inspection Checklist – Dry Detention Basin Dry Detention Basin Inspection - 1 of 3 Dry Detention Basin Operation, Maintenance, and Management Inspection Checklist Project: _________________________________________________________________ Address/Location:_________________________________________________________ Date/Weather: __________________________________Time: _____________________ Date of Last Inspection/Maintenance: _________________ Time: ____________________ Inspector: ___________________________ Title: ____________________________ Inspector Information: _____________________________________________________ Owner Information: _______________________________________________________ Signature: _______________________________________ Maintenance Item Satisfactory/ Unsatisfactory Comments 1. Embankment and emergency spillway Healthy vegetation with at least 85% ground cover No signs of erosion on embankment No animal burrows Embankment is free of woody vegetation Embankment is free of leaks or seeps Emergency spillway is clear of obstructions Sediment, little, floatables, and/or debris Vertical/horizontal alignment of top of dam “As- Built” Evidence of illicit discharges (odors, colored liquids, unusual vegetation, oily sheen, foreign substances, etc.) 2. Riser and principal spillway Trash rack is not blocked or damaged Riser is free of excessive sediment buildup Outlet pipe is in good condition Control valve is operational Post-Construction BMP Inspection Checklist – Dry Detention Basin Dry Detention Basin Inspection - 2 of 3 Maintenance Item Satisfactory/ Unsatisfactory Comments Outfall channels are stable and free of scouring 3. Permanent Pool (Wet Ponds) No evidence of undesirable vegetation No accumulation of floating or floatable debris No evidence of shoreline scour or erosion 4. Sediment Forebays Sediment is being collected by forebay(s) Forebay is not in need of cleanout (less than 50% full) 5. Dry Pond Areas Healthy vegetation with at least 85% ground cover No undesirable woody vegetation Vegetation Composition and Size According to Approved plan. No evidence of sediment and/or trash accumulation Sediment Depth (specify depth at which cleaning is required) Sediment Depth Channel 6. Low Flow Channel Clear of Obstructions Low flow outlet free of obstruction No riprap channel failures No evidence of slope erosion along channel 7. Condition of Outfall into Ponds No riprap failures No evidence of slope erosion or scouring Storm drain pipes are in good condition, with no evidence of non-stormwater discharges Endwalls/headwalls are in good condition Post-Construction BMP Inspection Checklist – Dry Detention Basin Dry Detention Basin Inspection - 3 of 3 Comments/Additional Notes/Actions to be taken: _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ 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. ©2021 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 06/21 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. APPENDIX D Owner Acknowledgment 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.). ConTech Cascade CS-4 Extended Dry Detention Owner Signature Date Printed Company (If applicable) STATE OF INDIANA ) ) SS: COUNTY OF _________ ) BEFORE ME, the undersigned, a Notary Public in and for said County and State personally appeared Owner/Agent subscribed and sworn before me this day of , . County of Residence Signature Commission Expiration Date Printed Name