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HomeMy WebLinkAbout3_Storm_Drainage_Plan_pg 79-96_03-07-2018 V:17007_02_Storm_Drainage_Plan_030716_SC 13 (03/07/18) SN/jil Appendix E INFILTRATION DATA Encased Falling Head Test Results On Third Trial Time (min)Depth (in)in/hr Time (min)Depth (in)in/hr Time (min)Depth (in)in/hr 0 24 0 24 0 24 0.18 12 4000.00 0.3 20 800.00 0.35 20 685.71 0.22 11 1500.00 0.45 19 400.00 0.38 19 2000.00 0.4 10 333.33 0.53 18 750.00 0.41 18 2000.00 1.06 9 90.91 1.04 17 117.65 0.43 17 3000.00 1.5 8 136.36 1.12 16 750.00 0.47 16 1500.00 2.41 7 65.93 1.2 15 750.00 0.5 15 2000.00 3.4 6 60.61 1.3 14 600.00 0.53 14 2000.00 5 5 37.50 1.43 13 461.54 0.57 13 1500.00 6.22 4 49.18 1.56 12 461.54 1 12 139.53 8.04 3 32.97 2.1 11 111.11 1.07 11 857.14 10.28 2 26.79 2.28 10 333.33 1.14 10 857.14 12 1 34.88 2.48 9 300.00 1.2 9 1000.00 14.07 0 28.99 3.05 8 105.26 1.27 8 857.14 3.25 7 300.00 1.38 7 545.45 Average 102.35 3.49 6 250.00 2.19 6 74.07 4.17 5 88.24 2.56 5 162.16 4.5 4 181.82 3.18 4 96.77 5.36 3 69.77 3.58 3 150.00 6.22 2 69.77 5.01 2 41.96 7.07 1 70.59 5.58 1 105.26 8.22 0 52.17 6.57 0 60.61 Average 175.18 Average 219.18 Southwest Corner Northwest Corner Northeast Corner V:17007_02_Storm_Drainage_Plan_030716_SC 14 (03/07/18) SN/jil Appendix F MAINTENANCE PLAN July 25, 2017 Updated March 6, 2018 Project No. 17007.02 STORM DRAINAGE FACILITY MAINTENANCE PLAN FOR ICON APARTMENT HOMES AT FERGUSON FARM BOZEMAN, MONTANA OVERVIEW NARRATIVE The purpose of this maintenance plan is to outline the necessary details needed to determine who is responsible for the maintenance of the facilities, when the facilities need to be maintained and who owns the storm drainage facilities. The City of Bozeman Design Standards and Specifications Policy , dated March 2004. The site stormwater improvements have been designed with the intent to meet the current City of Bozeman drainage regulations for the entire site to the extent feasible. Specific site information and criteria are described below: I. Ownership of all facilities Public access easements and public city park: The street public access easements and the city park access easement will include ADS StormTech chamber infiltration systems, inlets, and storm drain piping. The City of Bozeman will own all the stormwater facilities within their easements. Apartment Community: Bozeman Apartment Group, LLC will be own all stormwater facilities, including the ADS StormTech chamber systems, pervious pavers, dry wells, inlets and storm drain piping within Lot 3A of Minor Subdivision 365 that is not within the public access easements. II. Inspection Thresholds for Cleaning ADS Chamber System: If average depth of sediment exceeds 3 inches, clean ADS Chamber System. Refer to Isolator Row Maintenance Plan attached. Pervious Pavers: V:17007.02_SD Maintenance Plan 2 (03/07/18) SH/JL If average depth of sediment exceeds 2 inches, clean paver system. Refer to PaveDrain specifications attached. Dry Wells: If sediment in sump exceeds 5 inches or grate is more than 25% clogged with debris, clean grate and/or structure. Storm Drain Inlets and Manholes: If sediment in sump exceeds 5 inches or grate is more than 25% clogged with debris, clean grate and/or structure. Storm Drain Piping: If sediment in sump exceeds 2 inches, clean pipe. III. Cleaning: ADS Chamber System: To clean ADS Chamber Systems used the JetVac process outlined in the Isolator Row Inspection/Maintenance plan attached. PaveDrain: To clean PaveDrain use an approved vacuum outlined in the PaveDrain specifications attached. Nearby Owner of Vacuum Head: David – Rocky Mountain Super Vac 73 Morning Glory Lane Kalispell, MT 59901 406-257-4639 Manholes, Inlets, Dry Wells: To clean grate of structure, remove and dispose of debris clogging the grate. To clean structure, use catch basin vacuum to remove sediment and debris. Pipes: To clean pipes, flush pipe at inlet structure and ensure that debris is captured at outlet structure and is removed. IV. Schedule: ADS Chamber System: Inspection: Every 6 months Vacuum Manholes/Chambers: Every 5 years or as needed based on inspection Note: Refer to Isolator Row Maintenance Plan attached. Pervious Pavers: Inspection: Every 6 months Vacuum pavers every 5-7 years or as needed based on inspection. Note: PaveDrain specifications attached. Dry Wells: Inspection: Every 6 months Vacuum Drywells: Every 5 years or as needed based on inspection V:17007.02_SD Maintenance Plan 3 (03/07/18) SH/JL Storm Drain Inlets and Manholes: Inspection: Every 6 months Vacuum Inlets/Manholes: Every 5 years or as needed based on inspection Storm Drain Piping: Inspection: Inspect inverts and outlet inverts every 6 months Flush pipes every 5 years or as needed based on inspection and condition of inlet or manhole. V. Responsible Party: Public access easements and public city park: The City of Bozeman will be responsible for the inspection and maintenance of the stormwater inlets, manholes and pipes within their easements. Apartment Community: Bozeman Apartment Group, LLC will be responsible for all stormwater facilities located within Lot 3A of Minor Subdivision 365. And will be responsible for maintaining any ADS StormTech Chambers within the public access easements. This includes the chamber system design to retain the deficient volume from the Ferguson Farm subdivision to the south. PERMEABLE ARTICULATING CONCRETE BLOCK (P-ACB) SPECIFICATION FOR PARKING LOTS, DRIVEWAYS, ALLEYS AND ROADWAYS PART 1: GENERAL A. Definitions Contract Documents – the Contract Documents establish the rights and obligations of the parties and include the Agreement, Addenda (which pertain to the Contract Documents), CONTRACTOR’s Bid (including documentation accompanying the Bid and any post Bid documentation submitted prior to the Notice of Award) when attached as an exhibit to the Agreement, the Notice to Proceed, the Bonds, the General conditions, the Supplementary Conditions, the Specifications and the Drawings as the same are more specifically identified in the Agreement, together with all Written Amendments, Change Orders, Work Change Directives, Field Orders, and ENGINEER’s written interpretations and clarifications issued on or after the Effective Date of the Agreement. Approved Shop Drawings and the reports of subsurface and physical conditions are not Contract Documents. Only printed hard copies of the items listed in this paragraph are Contract Documents. Files in electronic media format, of text, data, graphics, and the like that may be furnished by OWNER to CONTRACTOR are not Contract Documents. CONTRACTOR – The individual or entity with whom OWNER has entered into the Agreement. Drawings – That part of the Contract Documents prepared or approved by the ENGINEER which graphically shows the scope, extent, and character of the Work to be performed by the CONTRACTOR. Shop Drawings and other CONTRACTOR submittals are not Drawings as so defined. ENGINEER- The individual or entity named as such in the Agreement. OWNER – The individual, entity, public body, or authority with whom the CONTRACTOR has entered into the Agreement and for whom the Work is to be performed. Project – The total construction of which the Work to be performed under the Contract Documents may be the whole, or part as may be indicated elsewhere in the Contract Documents. Resident Project Representative – The authorized representative of the ENGINEER who may be assigned to the Site or any part thereof. Samples – Physical examples of materials, equipment, or workmanship that are representative of some portion of the Work and which establish the standards by which such portions of the Work will be judged. Shop Drawings – All drawings, diagrams, illustrations, schedules, and other data or information which are specifically prepared or assembled for the CONTRACTOR and submitted by the CONTRACTOR to illustrate some portion of the Work. Site – Lands or areas indicated in the Contract Documents as being furnished by the OWNER upon which the Work is to be performeed, including the rights-of-way and easements for access thereto, and such other lands furnished by OWNER which are designated for the use of the CONTRACTOR. Specifications – That part of the Contract Documents consisting of written technical descriptions of materials, equipment, systems, standards, and workmanship applied to the Work and certain adminstrative details applicable there to. Subcontractor – An individual or entity having a direct contract with CONTRACTOR or with any other Subcontractor for the performance of a part of the Work at the Site. Supplier – A manufaturer, fabricator, supplier, distributor, material man, or vendor having a direct contract with CONTRACTOR or with any Subcontractor to furnish materials or equipment to be incorporated in the Work by the CONTRACTOR or Subcontractor. Work- The entire completed construction of the various separately identifiable parts thereof required to be provided under the Contract Documents. Work includes and is the result of performing or providing all labor, services and documentation necessary to produce such construction and furnishing, installing, and incorporating all materials and equipment into such construction, as required by the Contract Documents. B. Scope of Work The contractor shall furnish all labor, materials, equipment, and incidentals required and perform all operations in connection with the installation of the Permeable Articulating Concrete Block (P-ACB) in accordance with the lines, grades, design and dimensions shown on the Contract Drawings and as specified herein. C. Submittal The contractor shall submit to the engineer all manufacturer's performance research results and calculations in support of the permeable articulating concrete blocks P-ACB system and geotextile proposed for use. The contractor shall furnish to the engineer all manufacturer's specifications, literature, and installation drawings of the P-ACB. D. Preconstruction Conference Within 2 weeks prior to the installation of the P-ACB, a conference attended by CONTRACTOR, ENGINEER, Supplier, and others as appropriate will be held to establish a working understanding among the parties as to the Work and to discuss the schedules, procedures for handling Shop Drawings and other submittals, processing Applications for Payment, and maintaining required records. PART 2: PRODUCTS A. GENERAL Permeable Articulating Concrete Blocks (P-ACB) shall be premanufactured of individual concrete blocks with specific stormwater runoff and storage capacities. Blocks shall be hand-placed or mechanically installed with the use of a clamping or suction lifting device. Individual blocks in the P-ACB shall be staggered, beveled, and interlocked for enhanced stability. The blocks shall be constructed of closed cell blocks with an arched storage chamber for additional stormwater runoff as shown on the contract drawings. Each row of blocks shall be laterally offset by one-half block width from the adjacent row so that any given block is interlocked to four other blocks (two in the row above and two in the row below). Six adjacent blocks shall also surround each block. Each block shall incorporate interlocking surfaces that prevent lateral displacement of the blocks. The interlocking surfaces shall not protrude beyond the perimeter of the blocks to such an extent that they reduce the flexibility or articulating capability of the system. Backfilling of the joints between the P-ACB with rock chips or sand is not required and shall not be done or included in the Work. Infiltration Performance: The P-ACB will only be accepted when accompanied by documented third party infiltration performance characteristics based on ASTM C1701/C1701M-09, or C1781. The infiltration rate shall be no less than 1,000 inches per hour on an outdoor working surface, with typical base material utilized for the test. Structural Performance: The design of the P-ACB shall be capable of supporting AASHTO H-25 and HS-25 truck loading. The blocks shall be analyzed as unreinforced concrete arches supporting a uniform truck tire load with impact per AASHTO standards. The subgrade soil, geosynthetic and base preperation for the P-ACB shall be properly designed by a Registered Professional Engineer and inspected by the ENGINEER or the Resident Project Representative during and following the installation of the Work. B. Cellular Concrete Blocks Materials Cementitious Materials - Materials shall conform to the following applicable ASTM specifications: Portland Cements - Specification C 150, for Portland Cement. Blended Cements - Specification C 595, for Blended Hydraulic Cements. Hydrated Lime Types - Specification C 207, for Hydrated Lime Types. Pozzolans - Specifications C 618, for Fly Ash and Raw or Calcinated Natural Pozzolans for use in Portland Cement Concrete. Aggregates shall conform to the following ASTM specifications. Normal Weight - Specification C 33, for Concrete Aggregates. Visual Inspection All units shall be sound and free of defects that would interfere with the proper placing of the unit or impair the strength or permanence of the construction. Surface cracks incidental to the usual methods of manufacture, or surface chipping resulting from customary methods of handling in shipment and delivery, shall not be deemed grounds for rejection. Cracks exceeding 0.25 inches in width and/or 1.0 inch in depth shall be deemed grounds for rejection. Physical Requirements At the time of delivery to the work site, the units shall conform to the physical requirements prescribed in Table 1, Physical Characteristics. TABLE 1: PHYSICAL CHARACTERISTICS Item Description Values Dimensions Length x Width x Height 12” x 12” x 5.65” (+/- 1/8”) Compressive Strength ASTM D-6684 / C-140 Avg. of Three: 4,000 psi min. Individual units: 3,500 psi min. Block Weight Arched Block: 45-50 lbs/sf Solid Block: 55-60 lbs/sf Loading Capabilities Truck Load Traffic Rating AASHTO H-20, HS-20, HS-25 Joint Filler Between Blocks Material Used NONE Required Percent Open Space Surface: 7% Storage: 20% Water Absorption (%) Density (lbs/cf) ASTM D-6684 Table 1 / ASTM C-140 9.1% Avg. of Three, 11.7% Individual 130 Avg of Three, 125 Individual Storage Capacity Above Aggregate Within Arch 0.0833 cf/block Post-Installation, Verified Surface Infiltration Rate ASTM C1701/C1701M-09 ASTM C1781 Ave of three tests: 1,000 inches/hour/sf (MIN. 3 tests) Sampling and Testing The OWNER, ENGINEER or their authorized representative shall be accorded proper access to the manufacturer to inspect and obtain samples of the Permeable Articulating Concrete Blocks at the place of manufacture from lots ready for delivery. Expense of Tests Additional testing and associated costs, other than that provided by the manufacturer, shall be borne by the OWNER. Manufacturer The Permeable Articulating Concrete Blocks shall be PaveDrain® or pre-approved equal, as represented or distributed by: LOCALY NATIONAL ACF West, Inc. PaveDrain, LLC PH. (800) 878-511500-597-2180 PH. (888) 575-5339 info@acfwest.com info@pavedrain.com http://www.acfwest.com www.pavedrain.com "Or-Equal" Items: If in ENGINEER's sole discretion an item of material or equipment proposed by CONTRACTOR is functionally equal to that named and sufficiently similar so that no change in related Work will be required, it may be considered by ENGINEER as an "or-equal" item, in which case review and approval of the proposed item may, in ENGINEER's sole discretion, be accomplished without compliance with some or all of the requirements for approval of proposed substitute items. A proposed item of material or equipment will be considered functionally equal to an item so named if: a. in the exercise of reasonable judgment ENGINEER determines that: (i) it is at least equal in quality, durability, appearance, strength, and design characteristics; (ii) it will reliably perform at least equally well the function imposed by the design concept of the completed Project as a functioning whole, and; b. CONTRACTOR certifies that: (i) there is no increase in cost to the OWNER; and (ii) it will conform substantially, even with deviations, to the detailed requirements of the item named in the Contract Documents. PART 3: FOUNDATION PREPARATION AND BLOCK INSTALLATION A. Foundation and Preparation General. Areas on which permeable articulating concrete blocks are to be placed shall be constructed to the lines and grades shown on the Drawings and to the tolerances specified in the Contract Documents. Any proposed changes shall be reviewed and approved by the ENGINEER. References. 1. Oregon DOT – 2015 Standard Specifications for Construction. 2. Washington DOT – 2016 Standard Specifications for Road, Bridge & Municipal Construction. 3. Idaho Transportation Dept – 2012 Standard Specification for Highway Construction 4. Utah DOT – 2017 Standards and Specifications 5. Nevada DOT – 2014 Standard Specifications for Road and Bridge Construction. 6. Montana DOT – 2014 Standard Specifications for Road and Bridge Construction. Subgrade. Unless required on the Drawings, compaction of underlying subgrade soil shall be avoided or minimized in order to encourage infiltration of stormwater. A Geotechnical Engineer should be consulted to determine the CBR values of the subgrade prior to the installation of the subbase materials and geotextile stabilizing fabrics and grids. Geotextile Separator or Geogrid Stabilization. Monofilament or multifilament geotextile, that include Mirafi RS380i or its equivalent, or other geotextile material as shown on the Drawings shall be installed on the bottom and sides of the excavation to prevent in – situ soil contamination of the clean aggregate subbase. A geogrid may be required for sub base stabilization, but is not recommended on the sides of the aggregate sub base to separate the in-situ soils from the clean sub base aggregate. Aggregate Subbase. If more than 6” of base aggregate is required, as shown on the Drawings,, only the top 4-6” shall be AASHTO #57 aggregate. The aggregate shall be clean, angular on all sides with no fines.As shown on the Drawings, this is the leveling course directly beneath the P-ACB blocks. Additional aggregate depth shall consist of either AASHTO #2 or #3 clean, angular on all sides, aggregate, or as shown on Drawings. Crushed Aggregate Base Course: Follow State Specifications Compaction: Standard compaction. 95 percent maximum density determined by Modified Proctor. Allow ENGINEER to inspect prepared base course and to witness proof roll test by a fully loaded dump truck. Reconstruct where deflection is greater than ½ inch. Allowable deviation from design grade: ½ inch. The base course shall be firm and non-yielding, compacted until it does not creep or weave in front of the roller or compacting vehicle. The aggregate bedding layer shall be compacted to a smooth plane surface to ensure intimate and positive contact is achieved between the legs of the permeable articulating concrete blocks and the compacted aggregate subbase layer and the Geogrid Separator. AASHTO #2 or #3 subbase aggregate shall be compacted in 6-8” lifts with a roller- compactor. The AASHTO #57 aggregate leveling subbase shall be rolled and then compacted with a minimum 10,000 psi plate compactor in both the perpendicular and parallel directions in the area of coverage.The CONTRACTOR shall compact a 2” layer of the AASHTO #57 Aggregate into AASHTO #2 or #3 aggregate. Geogrid Separator. Install Naue Secugrid 20/20, (or equal) geogrid separator shall be directly on top of the compacted leveling course. The geogrid seperator may be installed prior to the compaction of the leveling course. This will create a “snow shoe” effect and minimize damage from foot traffic prior to placement of the P-ACB. Inspection. Immediately prior to placing the P-ACB the prepared area shall be inspected by the ENGINEER or Resident Project Representative, the OWNER’s representative, and or by the manufacturer's representative. No blocks shall be placed thereon until that area has been approved by the ENGINEER. B. Placement of Permeable Articulating Concrete Blocks General. Permeable articulating concrete blocks shall be constructed within the specified lines and grades shown on the Drawings. Placement. The P-ACB shall be placed on the geogrid separator so as to produce a smooth plane surface. No individual block within the plane of placed articulating concrete mats shall protrude more than one-quarter of an inch unless otherwise specified by the ENGINEER. Consultation. The Supplier will provide design and construction advice during the design and installation phases of the project. The Supplier will not supervise, direct, control, or have authority over or be responsible for CONTRACTOR's means, methods, techniques, sequences, or procedures of construction, or the safety precautions and programs incident thereto, or for any failure of CONTRACTOR to comply with Laws and Regulations applicable to the performance of the Work. Finishing. The joints between the P-ACB shall not be backfilled with smaller aggregates or sand in order to function properly. The joints shall be left open. This includes following maintenance of the P-ACB. If the joints are filled with smaller aggregates or sand, the CONTRACTOR shall be responsible for the removal of the material and perform infiltration tests to assure that the P-ACB meets the minimum infiltration tests described in this specification. Post Installation Certification. Upon completion of the P-ACB installation, the surface infiltration rate of the pavement shall be verified by ASTM C1701M-09 or ASTM C1781 to confirm the required infiltration rate of the pavement (per Table 1). If the system fails to perform as required in section Table 1 of this spec, it shall be removed and replaced at the supplier’s cost. C. Maintenance of Permeable Articulating Concrete Blocks General. The maintainabilty of the permeable articulating concrete blocks shall be based on a maintenance study of at least 24 months conducted by an independent or third party representation. - The study shall include multiple pre and post testing documentations in multiple locations of infiltration rates according to ASTM C1701 or a modified version of ASTM C1701 where the infiltration rate is recorded without a head pressure. - Subsurface aggregate performance of pre and post testing shall also be documented over a 24 month period. - The study shall show that following proper maintenance the original performance of the P-ACB can effectively be restored to at least 90% of its original performance. Inspection & Maintenance. The manufacturer’s representative of the P-ACB shall provide a minimum 36 month maintenance program; including a visual inspection report with photos and a recommended cleaning schedule with a Vacuum truck such as the Elgin® Whirlwind® or Megawind® or with the PaveDrain® Vac Head and associated combination sanitation vac truck. The visual inspection and recommended cleaning schedule shall be included with the price of the system. Maintenance utilizing a combination sanitation vaccum truck with the PaveDrain vac head will be quoted and supplied by others based on the maintenance program. Maintenance shall be required when either of the following are reached: a. The surface infiltration rates of more than 75% of the surface area fall below 10% of the rate required in Table 1. b. Surface ponding remains for 24 hours in an area larger than 10 square feet. Isolator ®Row O&M Manual StormTech ®Chamber System for Stormwater Management Save Valuable Land and Protect Water Resources Detention • Retention • Water Quality A division of 1.1 INTRODUCTION An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance. The StormTech Isolator Row is a patented technique to inexpensively enhance Total Suspended Solids (TSS) removal and provide easy access for inspection and maintenance. 1.2 THE ISOLATOR ROW The Isolator Row is a row of StormTech chambers, either SC-310, SC-310-3, SC-740, DC-780, MC-3500 or MC- 4500 models, that is surrounded with filter fabric and con - nected to a closely located manhole for easy access. The fabric-wrapped chambers pro vide for settling and filtra - tion of sediment as storm water rises in the Isolator Row and ultimately passes through the filter fabric. The open bottom chambers and perforated side walls (SC-310, SC- 310-3 and SC-740 models) allow storm water to flow both verti cally and horizon tally out of the chambers. Sediments are cap tured in the Isolator Row protecting the storage areas of the adjacent stone and chambers from sediment accumulation. Two different fabrics are used for the Isolator Row. A woven geotextile fabric is placed between the stone and the Isolator Row chambers. The tough geo textile provides a media for storm water filtration and provides a durable surface for maintenance operations. It is also designed to prevent scour of the underlying stone and remain intact during high pressure jetting. A non-woven fabric is placed over the chambers to provide a filter media for flows passing through the perforations in the sidewall of the chamber. The non-woven fabric is not required over the DC-780, MC-3500 or MC-4500 models as these chambers do not have perforated side walls. 2 Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 1.0 The Isolator ®Row The Isolator Row is typically designed to capture the “first flush” and offers the versatility to be sized on a vol - ume basis or flow rate basis. An upstream manhole not only provides access to the Isolator Row but typically includes a high flow weir such that storm water flowrates or volumes that exceed the capacity of the Isolator Row overtop the over flow weir and discharge through a manifold to the other chambers. The Isolator Row may also be part of a treatment train. By treating storm water prior to entry into the chamber system, the service life can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best management practices can be as simple as deep sump catch basins, oil-water separators or can be inno - vative storm water treatment devices. The design of the treatment train and selection of pretreatment devices by the design engineer is often driven by regulatory requirements. Whether pretreatment is used or not, the Isolator Row is recommended by StormTech as an effective means to minimize maintenance requirements and maintenance costs. Note: See the StormTech Design Manual for detailed information on designing inlets for a StormTech system, including the Isolator Row. ECCENTRIC HEADER MANHOLE WITH OVERFLOW WEIR STORMTECH ISOLATOR ROW OPTIONAL PRE-TREATMENT OPTIONAL ACCESS STORMTECH CHAMBERS StormTech Isolator Row with Overflow Spillway (not to scale) Looking down the Isolator Row from the manhole opening, woven geotextile is shown between the chamber and stone base. 2.0 Isolator Row Inspection/Maintenance Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 3 Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water noz - zle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, the captured pollutants are flushed back into the man - hole for vacuuming. Most sewer and pipe maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle will improve maintenance efficiency. Fixed nozzles designed for cul - verts or large diameter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45” are best. Most JetVac reels have 400 feet of hose allow - ing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by StormTech) over their angular base stone. 2.1 INSPECTION The frequency of Inspection and Maintenance varies by location. A routine inspection schedule needs to be established for each individual location based upon site specific variables. The type of land use (i.e. industrial, commercial, residential), anticipated pollutant load, per - cent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, StormTech recommends annual inspec - tions. Initially, the Isolator Row should be inspected every 6 months for the first year of operation. For sub sequent years, the inspection should be adjusted based upon previous observation of sediment deposition. The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports (as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to deter - mine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Isolator Row, clean-out should be performed. 2.2 MAINTENANCE The Isolator Row was designed to reduce the cost of periodic maintenance. By “isolating” sediments to just one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage bed. If inspection indicates the potential need for main - tenance, access is provided via a manhole(s) located on the end(s) of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a confined space entries. StormTech Isolator Row (not to scale) Examples of culvert cleaning nozzles appropriate for Isolator Row maintenance. (These are not StormTech products.) NOTE: NON-WOVEN FABRIC IS ONLY REQUIRED OVER THE INLET PIPE CONNECTION INTO THE END CAP FOR DC-780, MC-3500 AND MC-4500 CHAMBER MODELS AND IS NOT REQUIRED OVER THE ENTIRE ISOLATOR ROW. Step 1) Inspect Isolator Row for sediment A) Inspection ports (if present) i. Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod, measure depth of sediment and record results on maintenance log. iv. If sediment is at, or above, 3 inch depth proceed to Step 2. If not proceed to step 3. B) All Isolator Rows i. Remove cover from manhole at upstream end of Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet pipe 1. Mirrors on poles or cameras may be used to avoid a confined space entry 2. Follow OSHA regulations for confined space entry if entering manhole iii. If sediment is at or above the lower row of sidewall holes (approximately 3 inches) proceed to Step 2. If not proceed to Step 3. Step 2) Clean out Isolator Row using the JetVac process A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable B) Apply multiple passes of JetVac until backflush water is clean C) Vacuum manhole sump as required Step 3) Replace all caps, lids and covers, record observations and actions Step 4) Inspect & clean catch basins and manholes upstream of the StormTech system ADS “Terms and Conditions of Sale” are available on the ADS website, www.ads-pipe.com Advanced Drainage Systems, the ADS logo, and the green stripe are registered trademarks of Advanced Drainage Systems. Stormtech ®and the Isolator ®Row are registered trademarks of StormTech, Inc. Green Building Council Member logo is a registered trademark of the U.S. Green Building Council. © 2013 Advanced Drainage Systems, Inc. SO90809 02/13 3.0 Isolator Row Step By Step Maintenance Procedures 4 21) B) 1) A) StormTech Isolator Row (not to scale) Stadia Rod Readings Fixed point Fixed point Sediment Date to chamber to top of Depth Observations/Actions Inspector bottom (1) sediment (2) (1) - (2) 3/15/01 6.3 ft. none New installation. Fixed point is Cl frame at grade djm 9/24/01 6.2 0.1 ft. Some grit felt sm 6/20/03 5.8 0.5 ft. Mucky feel, debris visible in manhole and in rv Isolator row, maintenance due 7/7/03 6.3 ft. 0 System jetted and vacuumed djm Sample Maintenance Log 70 Inwood Road, Suite 3 Rocky Hill Connecticut 06067 860.529.8188 888.892.2694 fax 866.328.8401 www.stormtech.com Detention • Retention • Water Quality A division of