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HomeMy WebLinkAboutMiscellaneous APPLICANT 6/23/2011 • • STORMWATER OPERATION AND MAINTENANCE PLAN FOR 51St-52nd and Main Street Redevelopment 5175 & 5195 Main Street Springfield, OR June 23, 2011 Prepared For OBO Enterprises, LLC 1390 Grosbeak Court Redmond, OR 97756 \���p PROpee 2 r 3800PE Branch Engineering, Inc. WREN 310 5th Street C'•F dO/ 09 200' ,1:t" Springfield, OR 97477 QoRY A. 0° Phone (541) 746-0637 Fax (541) 746-0389 6199/2r3/-/L aBranch Engineering, Inc. PROJECT# 09-159 Date Received: JUN 2'3 2011 Final Submittal I Branch Engineering , Inc . Corporate Headquarters Salem Engineering Office Principals (541)746-0637 (503)779-2577 M.Lane Branch,PE 310 5°'Street 147 Commercial Street NE,Suite 10 Damien Gilbert,PE Springfield,OR 97477 Salem,OR 97301 Renee Clough,PE, PLS,AICP Rene'Fabricant,PE,SE www.BranchEngineering.com Ronald J. Derrick.PE TECHNICAL MEMORANDUM Date: June 23, 2011 To: OBO Enterprises, LLC —Nick Boyles cc: City of Springfield From: Branch Engineering Re: Operation and Maintenance of OBO Enterprises, LLC 51st-52"d & Main Street Redevelopment on-site stormwater treatment system Branch Project No. 09-159 The stormwater operations and maintenance plan was prepared for the 51st-52' & Main Street Redevelopment located at 5175 & 5195 Main Street in Springfield, Oregon. City of Springfield's Conditions of Approval for this development requires a stormwater treatment system operations and maintenance plan. The stormwater treatment system is two vegetated infiltration basins with overflows and double chambered catch basins. The operation and maintenance log and schedule are attached. • • Simplified Operations and Maintenance Specifications for Basins C. Simplified Operations and Maintenance Specifications for Catch Basins C. Simplified Operations and Maintenance Specifications for Pervious Pavers • Specifications for Maintenance of Flo-Gard +Plus Catch Basin Insert Filters • Stormwater Management Facility Inspection & Maintenance Log Drainage Basin Map Responsibility City of Springfield's Conditions of Approval for this development requires a responsible party be named for operating and maintaining the system. The current owner shall be responsible for operating and maintaining the stormwater system. The responsibility shall be transferred to the future owner if the land is sold or donated. Date Received: JUN 232011 CIVIL STRUCTURES TRANSPORTATION GEOTECHIJICAL SURVEYING Simplified Operations and Maintenance Specifications BASINS What To Look For What To Do Structural Components, including inlets and outlets/overflows, shall freely convey stormwater. > Clogged inlets or outlets > Remove sediment and debris from catch basins, trench drains, curb inlets, and pipes to maintain at least 50% conveyance capacity at all times. > Cracked drain pipes or grates > Repair/seal cracks. Replace when repair is insufficient. > Check dams > Maintain 4- to 10-inch-deep rock check dams at 12-to 20-foot intervals. Vegetation shall cover 90%of the facility. > Dead or strained vegetation > Replant per original planting plan, or substitute from SWMM Appendix F.4 plant list. > Irrigate as needed. Mulch banks annually. DO NOT apply fertilizers, herbicides,or pesticides. > Tall grass and vegetation > Cut back grass and prune overgrowth 1-2 times a year. > Weeds > Manually remove weeds. Remove all plant debris. Growing/Filter Medium, including soil and gravels, shall sustain healthy plant cover and infiltrate within 48 hours. > Gullies > Fill, lightly compact, and install plant vegetation to disperse flow. > Erosion > Replace splash blocks or inlet gravel/rock. r Slope slippage > Stabilize 3:1 slopes/banks with plantings from SWMM Appendix F.4. > Ponding > Rake,till,or amend to restore infiltration rate. Maintenance Schedule: Summer. Make any structural repairs. Improve filter medium as needed. Clear drain. Irrigate as needed. Fall. Replant exposed soil and replace dead plants. Remove sediment and plant debris. Winter. Monitor infiltration/flow-through rates. Clear inlets and outlets/overflows to maintain conveyance. Spring. Remove sediment and plant debris. Replant exposed soil and replace dead plants.Mulch. All seasons. Weed as necessary. Maintenance Records: Record date, description, and contractor(if applicable) for all structural repairs, landscape maintenance, and facility cleanout activities. Keep work orders and invoices on file and make available upon request of the City inspector. Access: Maintain ingress/egress, including access roads, to design standards. Infiltration/Flow Control: All facilities shall drain within 48 hours. Record time/date, weather, and site conditions when ponding occurs. Pollution Prevention: All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater. Contact Spill Prevention& Citizen Response at 503-823- _7180 for immediate assistance responding to spills. Record time/date, weather, and site conditions if site activities contaminate stormwater. Vectors (Mosquitoes&Rodents): Stormwater facilities shall not harbor mosquito larvae or rats that pose a threat to public health or that undermine the facility structure. Monitor standing water for small wiggling sticks perpendicular to the water's surface. Note holes/burrows in and around facilities. Call Multnomah County Vector Control at 503- 988-3464 for immediate assistance to eradicate vectors. Record time/date, weather, and site conditions when vector activity observed. Date Received: JUN 2 3 2011 Chapter 3: Operations and Maintenance 3-12 Portland StormwatecManagement Manual—August 1, 2008 Final Submittal • Operations and Maintenance Specifications CATCH BASINS Catch Basins The performance of catch basins for removing sediment and other pollutants depends on routine maintenance to retain the storage available in the sump in order to capture sediment and most floatables. • Remove debris and sediment every 6 months (or when one-third full of sediment). > Dewater and dispose of sediment properly. Test sediment that has a heavy oil sheen and/or odors to determine the appropriate disposal. > Maintain the hooded outlet to prevent floatable materials, such as trash and debris, from entering the storm drain system. > Maintain the grate as designed for safety reasons and to prevent trash and debris from collecting in the catch basin. • Repair/seal cracks. Replace when repair is insufficient. > Keep a log of the amount of sediment collected and the date of removal. Date Received: JUN 21 2011 Final Submittal Chapter 3: Operations and Maintenance 3-17 Portland Stormwater Management Manual—August 1, 2008 • • Simplified Operations and Maintenance Specifications PERVIOUS PAVEMENT What To Look For What To Do Structural Components, including surface materials, shall evenly infiltrate stormwater. ➢ Clogged surface ➢ Vacuum sweep at least twice a year. ➢ Powerwash annually or as needed. Do not use surfactants. ➢ Cracked or moving edge restraints ➢ Repair per manufacturer's specifications. • S. Cracked or settled pavement Vegetation ➢ Large shrubs or trees ➢ Sweep leaf litter and sediment to prevent surface clogging and ponding. ➢ Prevent large root systems from damaging • subsurface structural components. ➢ Weeds ➢ Permeable pavers: manually remove weeds. Do not use herbicides. Mow,torch,or inoculate with preferred vegetation. Many pavers are designed to have pore space vegetation. Filter Medium ➢ Aggregate loss in pavers from settling and ➢ Replace paver pore space with aggregate from from powerwashing original design. Maintenance Schedule: Summer. Make necessary structural repairs. Fall. Vacuum sweep. Winter. Monitor infiltration rate. Spring. Powerwash, with proper disposal. Vacuum sweep. All seasons. Weed as necessary. Maintenance Records. Record date, description, and contractor(if applicable)for all structural repairs, landscape maintenance, and facility cleanout activities. Keep work orders and invoices on file and make available upon request of the City inspector. Infiltration/Flow Control: All facilities shall drain within 48 hours. Record time/date,weather, and site conditions when ponding occurs. Pollution Prevention: All sites shall implement best management practices to prevent hazardous or solid wastes or excessive oil and sediment from contaminating stormwater. Contact Spill Prevention & Citizen Response at 503-823-7180 for immediate assistance responding to spills. Record time/date, weather, and site conditions if site activities contaminate stormwater. Vectors(Mosquitoes& Rodents): Stormwater facilities shall not harbor mosquito larvae or rats that pose a threat to public health or that undermine the facility structure. Monitor standing water for small wiggling sticks perpendicular to the water's surface. Note holes/burrows in and around facilities. Call Multnomah County Vector Control at 503-988-3464 for immediate assistance to eradicate vectors. Record time/date, weather, and site conditions when vector activity observed. Date Received: JUN 2'3 2011 • Final Submittal Chapter 3: Operations and Maintenance 3-14 Portland Stormwater Management Manual—August 1, 2008 N$.IS ARi on preOlEC GENERAL SPECIFICATIONS FOR MAINTENANCE OF FLO-GARD+PLUS®CATCH BASIN INSERT FILTERS SCOPE: Federal, State and Local Clean Water Act regulations and those of insurance carriers require that stormwater filtration systems be maintained and serviced on a recurring basis. The intent of the regulations is to ensure that the systems, on a continuing basis, efficiently remove pollutants from stormwater runoff thereby preventing pollution of the nation's water resources. These specifications apply to the FloGard+Plus Catch Basin Insert Filter. RECOMMENDED FREQUENCY OF SERVICE: Drainage Protection Systems (DPS) recommends that installed Flo-Gard+Plus Catch Basin Insert Filters be serviced on a recurring basis. Ultimately, the frequency depends on the amount of runoff, pollutant loading and interference from debris (leaves, vegetation, cans, paper, etc.); however, it is recommended that each installation be serviced a minimum of three times per year, with a change of filter medium once per year.DPS technicians are available to do an on-site evaluation,upon request. RECOMMENDED TIMING OF SERVICE: DPS guidelines for the timing of service are as follows: 1. For areas with a definite rainy season: Prior to,during and following the rainy season. 2. For areas subject to year-round rainfall:On a recurring basis(at least three times per year). 3. For areas with winter snow and summer rain: Prior to and just after the snow season and during the summer rain season. • 4. For installed devices not subject to the elements(washracks,parking garages,etc.): On a recurring basis(no less than three times per years). SERVICE PROCEDURES: 1. The catch basin grate shall be removed and set to one side. The catch basin shall be visually inspected for defects and possible illegal dumping. If illegal dumping has occurred,the proper authorities and property owner representative shall be notified as soon as practicable. 2. Using an industrial vacuum, the collected materials shall be removed from the liner. (Note: DPS uses a truck-mounted vacuum for servicing Flo-Gardt-Plus®catch basin inserts.) 3. When all of the collected materials have been removed, the filter medium pouches shall be removed by unsnapping the tether from the D-ring and set to one side. The filter liner, gaskets, stainless steel frame and mounting brackets, etc. shall be inspected for continued serviceability. Minor damage or defects found shall be corrected on-the-spot and a notation made on the Maintenance Record.More extensive deficiencies that affect the efficiency of the filter(torn liner, etc.), if approved by the customer representative, will be corrected and an invoice submitted to the representative along with the Maintenance Record. 4. The filter medium pouches shall be inspected for defects and continued serviceability and replaced as necessary and the pouch tethers re-attached to the liner's D-ring. See below. 5. The grate shall be replaced. Date Received: • JUN 23 2011 Final Submittal • • REPLACEMENT AND DISPOSAL OF EXPOSED FILTER MEDIUM AND COLLECTED DEBRIS The frequency of filter medium pouch exchange will be in accordance with the existing DPS-Customer Maintenance Contract. DPS recommends that the medium be changed at least once per year. During the appropriate service, or if so determined by the service technician during a non-scheduled service, the filter medium pouches will be replaced with new pouches. Once the exposed pouches and debris have been removed, DPS has possession and must dispose of it in accordance with local, state and federal agency requirements. DPS also has the capability of servicing all manner of catch basin inserts and catch basins without inserts, underground oiUwater separators, stormwater interceptors and other such devices. All DPS personnel are highly qualified technicians and are confined space trained and certified. Call us at (888)950-8826 for further information and assistance. Date Received: JUN 2;3 2011 Final Submittal • • STORMWATER MANAGEMENT FACILITY INSPECTION & MAINTENANCE LOG Property Address: Inspection Date: Inspection Time: Inspected By: Approximate Date/Time of Last Rainfall: Type of Stormwater Management Facility: Location of Facility on Site(In relation to buildings or other permanent structures): Water levels and observations(Oil sheen,smell,turbidity,etc.): Sediment accumulation&record of sediment removal: Condition of vegetation(Height,survival rates,invasive species present,etc.) &record of replacement and management(mowing,weeding,etc.): Condition of physical properties such as inlets,outlets,piping,fences,irrigation facilities, and side slopes.Record damaged items and replacement activities: Presence of insects or vectors. Record control activities: Identify safety hazards present.Record resolution activities: Date Received: JUN 23 2011 Final Submittal leI o I1 U c �JI �O��•, /�� ç hill CO G1 4iIiti m N W O Ck3 %S � a) ! 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