Baltimore_ANGB_NPDES_Restoration_Compliance_SOW_18_July_2014.docx

STATEMENT OF WORK

NPDES CHESEAPEAKE BAY RESTORATION COMPLIANCE

AND IMPERVIOUS SURFACE EVALUATION

MARYLAND AIR NATIONAL GUARD

BALTIMORE (MARTIN STATE) AIR NATIONAL GUARD BASE

BALTIMORE, MD

21 July 2014

1.0 INTRODUCTION

In November 1990, federal stormwater discharge requirements were promulgated as part of the National Pollutant Discharge Elimination System (NPDES) under the Clean Water Act (55 Federal Register 48062-48901). These regulations, as stated in 40 Code of Federal Regulations (CFR) Parts 122, 123, and 124, require the owners of "facilities that discharge storm water associated with industrial activity" to apply for a stormwater permit if stormwater is discharged to (1) waters of the United States or (2) separate storm sewer systems. In accordance with Federal stormwater permitting requirements, industrial users must certify that all stormwater outfalls have been surveyed and the survey data have been evaluated for the presence of non-stormwater discharges.

The 175th Wing of the Maryland Air National Guard (MANG) in Baltimore, Maryland is an Air Force Installation whose mission is to provide air combat forces and theater airlift aircraft to America's Unified Combatant Commands, and it operates and maintains C-130J and A-10 aircraft to achieve this mission. The base is comprised of primarily impervious surfaces with a variety of industrial activities that include aircraft, equipment, and vehicle maintenance and cleaning operations; bulk fuel and chemical storage and dispensing locations; and hazardous material and hazardous waste storage areas.

Industrial stormwater discharges from MANG fall into Sector S, Air Transportation, as defined in Maryland Department of the Environment’s (MDE) General Discharge Permit for Storm Water Associated with Industrial Activities, No. 12-SW, which became effective on 1 January 2014. The installation was previously covered under permit No. 02-SW, but continued NPDES coverage under the new permit requires the submittal of a Notice of Intent (NOI), Stormwater Pollution Prevention Plan (SWPPP), and fee payment within six (6) months of the effective date. The base submitted its application package in February 2014, but it was rejected by MDE due to non-compliance with Part III, Stormwater Management Requirements, Section A, Chesapeake Bay Restoration Requirements.

Under Part III, A of the 12-SW general permit, MANG is required to “select, design, install, and implement restoration of 20% of the untreated impervious surface area at your facility or equivalent measures for the reduction of nutrients”. The industrial activities described above occur within four primary drainage areas that discharge to four corresponding outfalls on Base property. The two drainage areas that contain most of the industrial activity, DA-001 and DA-002, are estimated to be approximately 85% and 75% impervious, respectively. While recent construction projects (including the new Fire Station (Bldg. 3150), the new Main Gate, and the new Headquarters facility) have incorporated best management practices (BMPs) and low-impact development (LID) in their design, the majority of the impervious surfaces in DA-001 and DA-002 remain untreated. Consequently, MANG is required to comply with the provisions set forth in Part III, A of permit 12-SW.

2.0 DESCRIPTION OF WORK

The contractor shall perform an evaluation of the impervious surface cover at the MANG to compare the untreated impervious surfaces that existed at the facility on 1 January 2006 to the current impervious surfaces. In addition, the contractor will evaluate all practices implemented since 1 January 2006 that capture and/or otherwise treat any portion of the Water Quality Volume (WQv) through structural (e.g., rain gardens, bioretention areas, etc.) and non-structural (e.g., street sweeping, reduced fertilizer use, etc.) BMPs to determine if the base has met the required 20% requirement. If the base does not meet the requirement, the contractor will develop a Restoration Plan that provides recommendations to meet permit requirements and a schedule for implementation. In order to complete this work, the contractor shall perform the following tasks:

Task 1 – Kickoff and Site Visit

A project kickoff conference call will be held between the contractor and base POC. The contractor shall prepare an agenda and record meeting minutes and any action items. The contractor shall coordinate with the base to collect information and schedule the site visit. The initial data needs may include CAD and/or GIS data (depending on availability) from the baseline year (2006) and the current year, descriptions of practices implemented at the base to reduce nutrient (nitrogen and phosphorous) and sediment loading to the receiving waters, and information regarding active BMPs constructed on base. The site visit is expected to last one day and will include a walkthrough of the installation (including outfalls, industrial areas, stormwater management structures, and BMPs), a review of pertinent base documents, and interviews with appropriate base personnel (such as Civil Engineering and Environmental staff).

Task 2 – Impervious Surface Evaluation

Part III, A.2 of the permit outlines the steps for evaluation of impervious surfaces at the installation and for the development of a Restoration Plan. The contractor shall complete this evaluation conducting a desktop assessment of impervious surface area as of January 1, 2006, as determined to the best of your ability. The total area of impervious surface as of this data will be used as the baseline for determining the applicable about of control measures necessary to meet permit requirements. The contractor may utilize a combination of available CAD and GIS files and historical aerial imagery to complete this task.

The contractor shall use the baseline impervious surface area to calculate the total impervious surface area subject to the 20% control measure requirement for treatment under conditions of the permit.

Task 3 – Draft and Final Restoration Plan

After determining the area of impervious cover subject to the 20% requirement, the contractor will evaluate methods of meeting the base’s needs, including:

· Restoration control measures using the “Maryland Stormwater Design Manual, Volumes I & II (Design Manual)” and/or Stormwater controls approved through the Department’s Review Process for New Technologies as described in the Department’s 2005 Proprietary Stormwater Practice Guidance titled “Facts About …. Maryland’s Stormwater Program & Proprietary Practices”;

· Control measure alternatives from the “Accounting for Stormwater Wasteload Allocations and Impervious Acres Treated” dated June 2011; and

· Equivalent control measures as described in the permit.

The contractor will evaluate practices from the resources listed above that may be implemented at the Base to comply with the control measure requirement of the permit, determined in Task 2. BMPs and equivalent measures selected to meet the control measurement requirement must be documented including calculations that shown the approach used to achieve nutrient reduction.

A schedule for implementation of the selected BMPs and equivalent measures must be provided as well as appropriate routine maintenance schedules for all proposed BMPs. If any existing BMPs at the Base do not have a routine maintenance schedule already developed, the contractor is responsible to developing a schedule for each. Procedures for inspection and a method for documentation of inspection for each BMP, both structural and non-structural, and any equivalent control measures will be included in the maintenance schedules developed for this project.

The contractor will develop a draft Restoration Plan to be included as an Appendix to the base’s existing SWPPP (dated March 2013) that outlines its recommendations for BMPs and a schedule for implementation. The draft deliverable will consist of two hard copies and one electronic copy and will be submitted for government review. The contractor shall incorporate all government review comments/corrections in the final Restoration Plan. Upon receipt of the review comments from the base, the contractor shall be required to respond and change the plan, as appropriate. Once comments have been received, two hard copies and one electronic copy of the final Restoration Plan deliverable shall be submitted.

3.0 RESOURCES

The following documents and sources will be considered a minimum of documents applicable to this project:

· A copy of the application package sent to MDE for coverage under General Permit 12-SW;

· Communications between MDE and MANG regarding the application package;

· Current SWPPP, including any changes made since the March 2013 publication date;

· Stormwater sampling data;

· Engineering drawings (CAD) and/or geospatial data (GIS) of the installation’s storm sewer system including outfalls, monitoring stations, and impervious areas from 2006 and 2014;

· Design or as-built schematics for installed BMPs or stormwater management structures;

· Data for any hydrologic studies conducted at the base; and

· Existing facility backflow prevention device (BPD) inventory, testing results, or other BPD records.

4.0 PREREQUISITES

The selected contractor shall have extensive documented experience working with the Air National Guard and with the base. The contractor will have recent experience in water resources engineering and NPDES compliance for ANG bases.

5.0 SCHEDULE / PERIOD OF PERFORMANCE

The contractor shall develop a schedule for delivery of the draft and final Restoration Plan to be approved by the Baltimore ANGB. The site visit date(s) will be approved by Baltimore ANGB. The period of performance will be four months from the date of award.