Post-Construction Stream Restoration Inspection, Crediting Analysis and Costing

Turkey Branch, Upper Marlboro, MD - Clean Streams LLC assessed ~1100 linear feet of stream stabilization,  in a suburban neighborhood of Upper Marlboro along Turkey Branch, a 1st order tributary to the Western Branch of the Patuxent River in the Atlantic Coastal Plain. This included field inspection of stabilization structures within the LOD as well as status of the stream within the entire study reach (using Utility Cloud), estimation of quantities of materials and services needed for repair, followed by a memorandum (short report) on Maryland State crediting protocols and finally a calculation of potential credits available for the stabilized reaches as well as the potential for additional credits within the entire study reach..

Hensen Creek, Fort Washington, MD - Post-construction monitoring of an unnamed tributary to Hensen Creek based on the requirements outlined in the U.S. Army Corps of Engineers (USACE) Chesapeake Bay TMDL Activities Regional General Permit (TMDL RGP Permit Number 2018-61504). USACE TMDL RGP requires post-construction monitoring for a period of five (5) years (five full growing seasons) to ensure the integrity of the restoration and successful establishment of planted vegetation. Monitoring will commence at the start of the growing season following construction and landscaping completion and will occur in years 1, 3, and 5. This includes reporting to USACE. Monitoring includes channel cross-section, pattern, and profile (monumented) longitudinal profile, vegetation survey,  stream habitat assessment EPA 's Rapid Bioassessment Protocol (RBP), visual assessment, photo documentation and identification of corrective measures.

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Federal Projects

US Army Garrison Fort Lee, VA. Clean Streams LLC provided support to the prime contractor, Environmental Resources Group LLC, on its environmental compliance contract with the US Army Garrison (USAG) which has an VPDES small MS4 permit. Tasks included a virtual training to ERG field staff on field verification of constructed stormwater BMPs and outfall types, followed by a QA QC of all field classifications using aerial imagery, photographs and field notes and respond to concerns by the USAG. Gap analysis of the BMP tracking spreadsheet used by USAG to report to VADEQ BMP Warehouse and finally, review and quality control of an outfall validation and assessment report meant to determine point sources associated with the Fort’s MS4 systems as defined by 40 CFR 122.2.

US Naval Surface Warfare Center, Carderock, MD. Inspection of stormwater management facilities (BMPs) as required by the National Pollution Discharge Elimination System (NPDES), Municipal Separate Storm Sewer System (MS4) permit using custom-developed inspection forms. BMPs varied from proprietary to generic designs including green roofs, drywells, dry swales, underground detention, surface sandfilters and bioretention

US Army Ft. George G. Meade, MD; Developed an inventory of the stormwater management facilities on the property in preparation for receipt of a new General Permit for a Municipal Separate Storm Sewer System (MS4). Deliverables included a summary report and database ready for submission to the state regulatory agency.

Boards of Education

Frederick County MD Public School System - Developed a response plan for the Chesapeake Bay Restoration Requirement for the Hayward Road Maintenance Facility with Industrial Permit 12-SW.

  • Provided industrial permit support, including SWPPP creation, inspections, and training to staff.

Arlington County VA Public Schools - Assisted APS at onset of first SMS4 permit, from Registration Statement preparation, to illicit discharge detection and elimination (IDDE) planning, Good Housekeeping to annual reporting.


City of Alexandria, VA - Managed, trained and led a team of junior staff in the inspection of 89 stormwater management facilities (BMPs) as required by the City’s NPDES MS4 permit on a 2-month, accelerated schedule in order to meet reporting requirements to the state. BMPs varied from Green Infrastructure (GI) such as bioretention (shallow media and deep media for canopy tree design), Filterra® tree boxes, engineered swales, engineered planter boxes, permeable pavements, vegetated filter strips, 1,000 - 10,000 gallon rain-harvesting cisterns for both emergency services use and landscape watering, green roofs (extensive and variable media depth designs) to specialized / custom sand filter designs including the Delaware Sand Filter, Alexandria Compound Sand Filter and Austin Sand Filter, and proprietary BMPs using filtration, sedimentation and or hydrodynamics such as the Contech CDS® Model CDS2015-4-C, Stormceptor® Model STC-1800, Stormceptor® Model STC-450i, Stormceptor® Model STC-11000S, Stormceptor® Model STC-2400, Stormceptor® Model STC-6000, Stormceptor® Model STC-1200, Vortechs® Model 4000, Vortechs® Model 7000 and StormFilter®, BaySeparator™ Model TT-SO, BaySeparator™ Model 1/2K, BaySeparator™ Model 3K. Some sites were “industrial stormwater” facilities with high risk drainages such as bus fleet maintenance facilities and public works yards.

County Projects

Arlington County Virginia

  • Completed two years of stormwater management inspections to comply with MS4 permit BMP inspection-audit requirements for self-inspecting landowners. This included both a random audit component of 10% of all county BMPs and non-compliant landowners. Contacted landowners directly, completed inspections, generated a summary digital report, and sent results or violations letters to landowners with a summary of action items.​

  • New (2014) Virginia Stormwater Management Regulations Comparison Task, Arlington County Government - This task commissioned  by Arlington County, VA included comparing 5 existing permitted plans, 4  redevelopment projects and one new development project in Arlington County using the new Runoff  Reduction Method in order to evaluate the change in required detention volumes and the cost differential. The ability of the BMPs prescribed in the permitted plans to meet waters quality requirements under the new regulatory scenario was tested using the draft Virginia Runoff Reduction Method Compliance Worksheet (v2.7).

Howard County MD

  • Howard County MD Little & Middle Patuxent Watershed Assessments and Restoration Plans - The retrofit project, part of a larger county-wide effort sponsored by the County’s Storm Water Management Division, primed and managed by Versar with five subcontractors focused on the Middle and Little Patuxent watersheds. Versar: (1) assessed current conditions; and (2) recommend watershed restoration opportunities. This included field-evaluation, ranking for conceptual design of 71 exiting stormwater BMPs. Field assessment data were collected with mobile tablet devices through the ESRI ArcCollector application.​

  • Stormwater Pond & County Properties Retrofit for Howard County MD’s County-Wide Implementation  Strategy  - Led a team of civil engineers and GIS technicians that screened over 1,200  county-owned parcels for retrofit of new stormwater BMP and upgrade of almost 800 exiting stormwater  BMPs via desktop using an in-house methodology. Desktop analysis was followed by 240 field investigations which were ranked and screened and yielded 86 concept designs, 34 new retrofits on public property and 52 pond retrofits. Concept designs included computer- generated concept maps, detailed costs, modeled nutrient reduction estimations, and unified sizing criteria calculations in addition to planting plans for sites in need of additional forest canopy. Two summary reports were completed in 2013. The final product was integrated into the County-wide Implementation Strategy (CIS) also completed in 2013.   

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Utilities Projects

​WSSC (Washington Suburban Sanitary Commission)

  • Prepared the PATUXENT RESERVOIRS INTERIM WATERSHED MANAGEMENT REPORT – Developed an Interim Watershed Management Plan for the Washington Suburban Sanitary Commission’s (WSSC) Technical Advisory Committee (TAC), which consisted of 3 counties (Howard, Montgomery, Prince George’s) and Maryland state government. WSSC’s two reservoirs provide potable water for 1.8 million residents. The effort included a literature review of more than 30 reports characterizing watershed condition, GIS data analysis, two public meetings and recommendations for management of the Patuxent reservoirs watershed. The plan included a review of the current ability of the TAC to meet the 9 minimum elements required in a watershed plan in order to be considered for future EPA Clean Water Act, Section 319 funding for nonpoint source programs. 

​Ballenger McKinney WWTP, Frederick County MD

  • Stormwater Pollution Prevention Plan (SWPPP) Support - Provided on-going 02-SW and 12-SW industrial stormwater permit support for the Ballenger McKinney WWTP during renovations to 14MGD capacity, including preparation of new SWPPP, annual training, comprehensive annual inspections and identification of reporting deficits.

Clean Streams, a Limited Liability Company