REPAIR AND MAINTAIN STORMWATER STRUCTURES

PMIS 320885 ROCR July 6, 2026 PERFORMANCE WORK STATEMENT (PWS) for Repair and Maintenance of Stormwater Structures and Pervious Pavement 1.0 Background 1.1 The Contractor shall furnish all equipment, materials, tools, and labor necessary to perform the maintenance tasks for approximately 4.5 miles of pervious trails and parking lot pavement in Rock Creek Park and Fort Reno Park. The pervious surface area of the pavement is approximately 228,300 square feet. The contractor will be responsible under this contract for work to provide maintenance services as described in this document. 1.2 All work shall conform to Section 3.5.7 of the District Department of Energy & Environment (DOEE) “Stormwater Guidebook Permeable Pavement Systems.” 1.3 A Schedule of Tasks will be included in the appendix to indicate the frequency of each task/activity. 1.4 The performance requirement for the work as outlined above is to maintain 100% functionality of the Permeable Pavement System. 2.0 Scope 2.1 The Contractor will provide periodic maintenance services for pervious paving to keep the systems and assemblies operating to original performance specifications. The work may involve the use of specialized cleaning and debris collection equipment, as well as any other necessary materials needed to perform work under the terms of this PWS. 2.2 This contract will be between the National Park Service and the Contractor. The contractor shall be responsible for assuring that any subcontractor(s) perform the work as stated in this PWS as outlined. 2.3 Contractor shall submit work plan to include means and methods of performing tasks to the Contracting Officer’s Representative (COR) for approval prior to the commencement of any work. 3.0 Work to be Performed – The following are the tasks that will be performed by the contractor on a monthly, seasonal, and annual basis to fulfill this contract, as outlined in the Quality Assurance and Surveillance Plan and Schedule of Tasks in the appendix. 3.1 Permeable Pavement Maintenance 3.1.1 Routine maintenance 3.1.1.1 Inspection: Conduct visual inspection of pavement to determine that it is clean of debris and sediment and that it is dewatered quarterly, or as needed at least four times annually. -- 1 of 51 -- PMIS 320885 ROCR July 6, 2026 Inspect pavement after any major weather events such as rain or snowstorms of more than 1 inch of precipitation.; these inspections are in addition to the four annual inspections. 3.1.1.2 Maintenance: 3.1.1.2.1 Monthly: Remove leaves and sediment so that it does not become ground down into the surface. Any materials blown off pavement need to be collected by the Contractor, weighed, and taken off site. 3.1.1.2.2 As needed: Dry out any ponding or moist areas of pavement if moss is observed and use a lime mortar mix to kill the moss and vacuum clean the surface. 3.1.2 The performance requirement for the work as outlined above is to maintain 100% functionality of the Permeable Pavement System. 3.1.3 Locations: See 4.0 as well as Schedule of Locations which is in the appendix for details on the locations of work. 3.1.4 Contractor must maintain a maintenance log that records the following: • Date of service. • Name of individual/company performing service. • Type of maintenance performed. • Amount (lbs.) and type(s) of sediment/debris/other material removed as result of cleaning. • General observations and record of pavement condition. • Name/signature of individual completing the inspection. • Additionally, if ASTM C1701 is performed (see Section 7.0 of this Scope of Work), the test results and locations should be included in the report. • The log must be submitted to the COR each month for approval. 3.2 Permeable Pavement Repairs 3.2.1 If inspections reveal repairs are needed to the pervious pavement, notify the COR within 24 hours of discovery. This contract does not involve repair to the pervious pavement infrastructure; reporting only. 3.3 Inspect, Repair and Maintain Stormwater Structures at all locations shown in Paragraph 4 3.3.1 Debris Accumulation 3.3.1.1 Inspect for fallen leaves, debris, and litter accumulation. 3.3.1.2 Maintain: Remove these foreign materials. Especially before winter and in early spring, remove sediment especially when -- 2 of 51 -- PMIS 320885 ROCR July 6, 2026 more than two inches deep of if shown to impact the growth of required vegetation. 3.3.1.3 Scheduled Service: Spring and Fall, Monthly, and after major storm events. 3.3.2 Entry points and Pretreatment Areas 3.3.2.1 Inspect: Area such as filter strips, and Bioswale floor for excessive deposition of sediment, rocks, etc. Inspect monthly for erosion at inflows or ponding areas. 3.3.2.2 Maintain: Remove sediment and stabilize any eroded areas quarterly using methods approved by the and the NPS COR. Reestablish vegetations that conforms with original plant materials if needed, reseed and restore all filter strips. 3.3.2.3 Scheduled Service: Inspect monthly and after major storm events, and in the spring and fall. Maintain spring and fall, monthly during the growing season, and after major storm events. 3.3.3 Culverts 3.3.3.1 Inspect: All locations where culverts are part of the Bioswale system annually to ensure that erosion has not occurred at the outfall of said culverts. 3.3.3.2 Maintain: Repair eroded areas, replace or move to original locations all stone, grave, and revetment materials. Remove any debris that was not part of the original construction. 3.3.3.3 Scheduled Service: Inspect annually, Maintain When repair is needed as documented by inspections. 3.3.4 Check Dams 3.3.4.1 Inspect: Annual inspection to check dams for excessive deposition of sediment, rocks. Inspect condition of any choker layer materials on the front side of rock checks. 3.3.4.2 Maintain: Clear all debris and bring Check Dams back to original operational specification. 3.3.4.3 Scheduled Service: Inspect Annually, Maintain when inspection shows repa…