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HomeMy WebLinkAboutMaster Site Plan Storm Maintenance Plan1 Bridger Point Stormwater Maintenance and Inspection Plan 1. Purpose This plan outlines inspection, maintenance, and recordkeeping requirements to ensure the stormwater collection, treatment, and storage systems function as designed and remain in compliance with applicable regulations. 2.Applicability This plan applies to all on-site stormwater facilities, including: •Curb and grate inlets and stormwater mains •Hydrodynamic separator inlets (Contech model) •Underground stormwater storage/treatment facility 3. Responsible Party The Condominium Association and/or the Unit Owners, or an assigned maintenance contractor, are responsible for implementing this plan, scheduling inspections, performing maintenance, and retaining records. 4. Inspection Schedule Facility Type Routine Inspection Frequency Additional Inspection Triggers Stormwater inlets & mains Twice per year (spring and fall) After any storm > 0.5 inches in 24 hrs Hydrodynamic separator (Contech) Twice per year After major storms or visible sediment accumulation Underground stormwater facility Annually After major storms or system back-up events 5. Maintenance Tasks & Frequency A. Stormwater Inlets and Mains •Tasks: 2 o Remove sediment, trash, and debris from inlet grates and sumps. o Check for structural damage, corrosion, or misalignment. o Flush mains as needed to prevent blockages. • Frequency: Semi-annual + post-storm checks. B. Hydrodynamic Separators The inlets immediately prior to the underground stormwater storage facility are all Hydrodynamic Separators. *The attached Contech Maintenance Manual should be utilized in conjunction with this plan to ensure proper maintenance. * • Tasks: o Inspect access covers, gaskets, and safety grates. o Measure sediment depth with a calibrated probe. o Remove sediment and oils using a vacuum truck when sediment depth ≥ 50% of sump capacity. o Dispose of material at an approved disposal facility. • Frequency: Semi-annual inspections, cleaning as needed (typically 1–2 times/year). C. Underground Stormwater Facility *The attached Contech Maintenance Manual should be utilized in conjunction with this plan to ensure proper maintenance. * • Tasks: o Inspect access hatches and risers for security and watertightness. o Visually inspect interior for sediment buildup and structural condition. o Clean chambers with vacuum truck when sediment depth ≥ 3 inches or per manufacturer guidelines. o Check and clean pretreatment structures upstream to reduce frequency of underground system cleaning. o Ensure the outlet of the system and site discharge culvert is ensured to flow free without debris, trash, or anything that could block the flow of water. • Frequency: Annual inspection; cleaning as needed. 3 6. Recordkeeping • Maintain a Stormwater Maintenance Log including: o Date of inspection/maintenance o Inspector name/company o Findings and corrective actions o Volume and disposal location of removed material • Records must be retained for a minimum of 5 years and made available to regulatory agencies upon request. 7. Safety • Follow confined space entry procedures when accessing underground facilities. • Use appropriate PPE, including gloves, safety glasses, and fall protection where applicable. 8. Example Maintenance Log Table Date Facility Inspected Findings Action Taken Disposal Location Inspector STORAG E RE: KITCH E N FOR SH E L V I N G IN THIS A R E A HOTE L (180 R O O M S ) STM STM STM STM STM STMSTMSTMSTMSTMSTMSTMSTM STM STM STM STM STM STM STM STM STM STMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTM STMSTM STM STM STM STM STM STM STM STM STM STM STM STM STM STM STM STMSTM STMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTM STM STM HOTE L (180 R O O M S )<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>J GAS GASGASGAS GAS GAS GAS COMM COMMCOMMCOMM COMM COMM2''WGAS GAS GAS GAS GAS GAS GAS GAS GASCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMCOMMUGEUGEUGEUGEUGEUGEUGEUGEUGE JJ U G E U G E U G E U G E UGEUG E UGE UGE UGEUGEUGEUGEG A S G A S G A S G A S GASG A S G A S GASGASGAS GASGASC O M M C O M M C O M M C O MM C OM M C OMM COMM COMMCOMMCOMMCOMMOSWW VWWWWWWWWWWWWWSSSSCOMMGASUGESSSSC OCOSSCOCOWUGEUGEUGEUGEUGEUGEUGEWWSTM STM STM STM STM STMSTMSTMSTMSTMSTMSTMSTM STM STM STM STM STM STM STM STM STM STMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTM STMSTM STM STM STM STM STM STM STM STM STM STM STM STM STM STM STM STMSTM STMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTMSTM STM STM <><><><><><><> < > < > < > < > < > < > < > < > < > < > < > < > <> < > < ><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>U G S T O R M W A T E R FA C I L I T Y S E R V I N G P H A S E 2 UG S TO RMW A T ER F A C I L I T Y S ER V I NG P H A S E 1N 19TH AVEH W Y 9 0 O N R A M P H W Y 9 0 PHASE 1/CFA SEE PH 1 SITE PLAN PLANS FOR MORE DETAILED INFORMATION PHASE LINE PHASE LINEPHASE LINEPH 2 FUTURE DEVELOPMENT GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GAS GASGAS GAS GAS GAS GAS GAS GAS GAS GASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASGASUGP UGP UGP UGP UGP UGPU G P UG P UG P UG P U G P UG P U G P U G P UG P U G P U G P U G P UG P UG P U GP UGP UG P UGP UGP UGP UG P UGPUG P UGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPSWRSWRSWR SWRSW R SW R SW R SW R SWR SW R SW R SW R SW R SWR SW R SW R SW R SW R SWR SWR SW R SW R SW R SW R SWRSW R SW R SW R SW R S WR SW R SW R SW R SW R S W R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW R SW RWWWWWWWWWWWWWWWWWWWWWWWWWGAS GAS GAS GAS GAS GAS GAS UGP UGP UGP UGP UGP UGPUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIB UG-FIB UG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUG-FIBUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPUGPWW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WWWWEXISTING CULVERT TO REMAIN INV IN 4672.18 INV OUT 4671.37 FUTURE PH 2 APPROX. LOCATION OF STORMWATER DISCHARGE EXT'G 24" CULVERT N 19TH AVE ℄ EXT'G 24" CULVERT TO REMAIN INV IN 4667.09 PROPERTY LINE EXT'G HWY 90 ONRAMP ROADSIDE DITCH PH 1 STORMWATER DISCHARGE 105.00' 17.16' 24.00' 49.90' 42.95' 30.00' 30' 10' WIDE TELECOM EASEMENT 5' SIDE SETBACK 10' FRONT SETBACK 10' FRONT SETBACK CATCH BASIN 1 CATCH BASIN (TYP), DETAILED PLANS SUBMITTED WITH PH 1 SITE PLAN STORMWATER MAIN (TYP) STORMWATER MAIN (TYP) STORMWATER MAIN (TYP) OPEN AREA DRIVE-THRU (CONCRETE) PARKING LOT (ASPHALT) L AND SCAPED L A ND S C A P ED PATIO (TYP) PROPOSED 24" CULVERT CATCH BASIN 2 CATCH BASIN 3 CATCH BASIN 4 CATCH BASIN 6 CATCH BASIN 7 CATCH BASIN 9 CATCH BASIN 10 CATCH BASIN 11 HYDRODYNAMIC SEPERATOR CATCH BASIN 5 HYDRODYNAMIC SEPERATOR CATCH BASIN 12 HYDRODYNAMIC SEPERATOR 0 30'60' SCALE 1" = 30' N JLS 08/12/25 PROJECT NO: DATE: ENGINEER: REVISIONS DATENO.DESC. 325-05MASTER SITE PLANSTORMWATER MAINTENANCEBOZEMAN, MONTANABRIDGER POINT Underground stormwater detention and infiltration systems must be inspected and maintained at regular intervals for purposes of performance and longevity. Inspection Inspection is the key to effective maintenance of CMP detention systems and is easily performed. Contech recommends ongoing, quarterly inspections. The rate at which the system collects pollutants will depend more on site specific activities rather than the size or configuration of the system. Inspections should be performed more often in equipment washdown areas, in climates where sanding and/or salting operations take place, and in other various instances in which one would expect higher accumulations of sediment or abrasive/corrosive conditions. A record of each inspection is to be maintained for the life of the system. Maintenance CMP detention systems should be cleaned when an inspection reveals accumulated sediment or trash is clogging the discharge orifice. Accumulated sediment and trash can typically be evacuated through the manhole over the outlet orifice. If maintenance is not performed as recommended, sediment and trash may accumulate in front of the outlet orifice. Manhole covers should be securely seated following cleaning activities. Contech suggests that all systems be designed with an access/inspection manhole situated at or near the inlet and the outlet orifice. Should it be necessary to get inside the system to perform maintenance activities, all appropriate precautions regarding confined space entry and OSHA regulations should be followed. Systems are to be rinsed, including above the spring line, annually soon after the spring thaw, and after any additional use of salting agents, as part of the maintenance program for all systems where salting agents may accumulate inside the pipe. Maintaining an underground detention or infiltration system is easiest when there is no flow entering the system. For this reason, it is a good idea to schedule the cleanout during dry weather. The foregoing inspection and maintenance efforts help ensure underground pipe systems used for stormwater storage continue to function as intended by identifying recommended regular inspection and maintenance practices. Inspection and maintenance related to the structural integrity of the pipe or the soundness of pipe joint connections is beyond the scope of this guide. Contech® CMP Detention Inspection and Maintenance Guide CMP MAINTENANCE GUIDE 2/17 PDF © 2017 Contech Engineered Solutions LLC All rights reserved. Printed in USA. ENGINEERED SOLUTIONS 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 CMP DETENTION SYSTEMS Underground stormwater detention and infiltration systems must be inspected and maintained at regular intervals for purposes of performance and longevity. Inspection Inspection is the key to effective maintenance of CMP detention systems and is easily performed. Contech recommends ongoing, annual inspections. Sites with high trash load or small outlet control orifices may need more frequent inspections. The rate at which the system collects pollutants will depend more on- site specific activities rather than the size or configuration of the system. Inspections should be performed more often in equipment washdown areas, in climates where sanding and/or salting operations take place, and in other various instances in which one would expect higher accumulations of sediment or abrasive/ corrosive conditions. A record of each inspection is to be maintained for the life of the system. 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. CMP MAINTENANCE GUIDE 10/19 PDF © 2019 CONTECH ENGINEERED SOLUTIONS LLC, A QUIKRETE COMPANY ALL RIGHTS RESERVED. PRINTED IN USA. Maintenance CMP detention systems should be cleaned when an inspection reveals accumulated sediment or trash is clogging the discharge orifice. Accumulated sediment and trash can typically be evacuated through the manhole over the outlet orifice. If maintenance is not performed as recommended, sediment and trash may accumulate in front of the outlet orifice. Manhole covers should be securely seated following cleaning activities. Contech suggests that all systems be designed with an access/inspection manhole situated at or near the inlet and the outlet orifice. Should it be necessary to get inside the system to perform maintenance activities, all appropriate precautions regarding confined space entry and OSHA regulations should be followed. Annual inspections are best practice for all underground systems. During this inspection if evidence of salting/de-icing agents is observed within the system, it is best practice for the system to be rinsed, including above the spring line soon after the spring thaw as part of the maintenance program for the system. Maintaining an underground detention or infiltration system is easiest when there is no flow entering the system. For this reason, it is a good idea to schedule the cleanout during dry weather. The foregoing inspection and maintenance efforts help ensure underground pipe systems used for stormwater storage continue to function as intended by identifying recommended regular inspection and maintenance practices. Inspection and maintenance related to the structural integrity of the pipe or the soundness of pipe joint connections is beyond the scope of this guide. Contech® CMP Detention Inspection and Maintenance Guide ENGINEERED SOLUTIONS CMP DETENTION SYSTEMS CDS® Inspection and Maintenance Guide ENGINEERED SOLUTIONS Maintenance The CDS system should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate at which the system collects pollutants will depend more heavily on site activities than the size of the unit. For example, unstable soils or heavy winter sanding will cause the grit chamber 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 (e.g. spring and fall) however more frequent inspections may be necessary in climates where winter sanding operations may lead to rapid accumulations, or in equipment washdown areas. Installations should also be inspected more frequently where excessive amounts of trash are expected. The visual inspection should ascertain that the system components are in working order and that there are no blockages or obstructions in the inlet and separation screen. 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. Access to the CDS unit is typically achieved through two manhole access covers. One opening allows for inspection and cleanout of the separation chamber (cylinder and screen) and isolated sump. The other allows for inspection and cleanout of sediment captured and retained outside the screen. For deep units, a single manhole access point would allows both sump cleanout and access outside the screen. The CDS system should be cleaned when the level of sediment has reached 75% of capacity in the isolated sump or when an appreciable level of hydrocarbons and trash has accumulated. If absorbent material is used, it should be replaced when significant discoloration has occurred. Performance will not be impacted until 100% of the sump capacity is exceeded however it is recommended that the system be cleaned prior to that for easier removal of sediment. The level of sediment is easily determined by measuring from finished grade down 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. Particles at the top of the pile typically offer less resistance to the end of the rod than consolidated particles toward the bottom of the pile. Once this measurement is recorded, it should be compared to the as-built drawing for the unit to determine weather the height of the sediment pile off the bottom of the sump floor exceeds 75% of the total height of isolated sump. Cleaning Cleaning of a CDS systems 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 covers and insert the vacuum hose into the sump. The system should be completely drained down and the sump fully evacuated of sediment. The area outside the screen should also be cleaned out if pollutant build-up exists in this area. 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 should be cleaned out immediately. 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. The screen 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 also to ensure that proper safety precautions have been followed. Confined space entry procedures need to be followed if physical access is required. Disposal of all material removed from the CDS system should be done in accordance with local regulations. In many jurisdictions, disposal of the sediments may be handled in the same manner as the disposal of sediments removed from catch basins or deep sump manholes. Table 1: CDS Maintenance Indicators and Sediment Storage Capacities 800.925.5240www.ContechES.com Support• Drawings and specifications are available at www.contechstormwater.com. • Site-specific design support is available from our engineers. ©2017 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, earth stabilization and wastewater treament products. For information, visit www.ContechES.com or call 800.338.1122 NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS AN EXPRESSED WARRANTY OR AN IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. SEE THE CONTECH STANDARD CONDITION OF SALES (VIEWABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION. The product(s) described may be protected by one or more of the following US patents: 5,322,629; 5,624,576; 5,707,527; 5,759,415; 5,788,848; 5,985,157; 6,027,639; 6,350,374; 6,406,218; 6,641,720; 6,511,595; 6,649,048; 6,991,114; 6,998,038; 7,186,058; 7,296,692; 7,297,266; 7,517,450 related foreign patents or other patents pending. ENGINEERED SOLUTIONS CDS Model Diameter Distance from Water Surface to Top of Sediment Pile Sediment Storage Capacity ft m ft m y3 m3 CDS1515 3 0.9 3.0 0.9 0.5 0.4 CDS2015 4 1.2 3.0 0.9 0.9 0.7 CDS2015 5 1.3 3.0 0.9 1.3 1.0 CDS2020 5 1.3 3.5 1.1 1.3 1.0 CDS2025 5 1.3 4.0 1.2 1.3 1.0 CDS3020 6 1.8 4.0 1.2 2.1 1.6 CDS3025 6 1.8 4.0 1.2 2.1 1.6 CDS3030 6 1.8 4.6 1.4 2.1 1.6 CDS3035 6 1.8 5.0 1.5 2.1 1.6 CDS4030 8 2.4 4.6 1.4 5.6 4.3 CDS4040 8 2.4 5.7 1.7 5.6 4.3 CDS4045 8 2.4 6.2 1.9 5.6 4.3 CDS5640 10 3.0 6.3 1.9 8.7 6.7 CDS5653 10 3.0 7.7 2.3 8.7 6.7 CDS5668 10 3.0 9.3 2.8 8.7 6.7 CDS5678 10 3.0 10.3 3.1 8.7 6.7 CDS Inspection & Maintenance Log CDS Model: Location: Water Floatable Describe Maintenance Date depth to Layer Maintenance Personnel Comments sediment1 Thickness2 Performed —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— 1. The water depth to sediment is determined by taking two measurements with a stadia rod: one measurement from the manhole opening to the top of the sediment pile and the other from the manhole opening to the water surface. If the difference between these measurements is less than the values listed in table 1 the system should be cleaned out. 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.CDS Maintenance Guide - 7/18 (PDF)