DOCSLIB.ORG

Waitara Sewer Outfall Pump Station (NPDC-144)

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Waitara Sewer Outfall Pump Station (NPDC-144) Notice of Requirement – Waitara Sewer Outfall Pump Station (NPDC-144) New Plymouth District Council gives notice of its requirement for the following designation for a public work (or in respect of any land, water, subsoil, or airspace where a restriction is necessary for the safe or efficient functioning or operation of a public work) under Sections 168A, 181(4) and Form 20 of the Resource Management Act 1991. New designation Yes Lapsed designations requiring a new designation N/A 1. Introduction The New Plymouth District Council (as Requiring Authority) is seeking to designate an existing sewer outfall pump station in order to increase public awareness of the asset, streamline any future work in accordance with the designated purpose, being ‘Pump station outfall’ and effectively provide for the long term protection of the asset. 2. The sites to which the requirement applies are as follows: The site is located within the Open Space B Environment Area within the Operative District Plan and within overlays H2c (Flood Plain), H3 (Volcanic) and the Coastal Policy Area. In addition, the site is located within an existing Designation (L1), which is for the purpose of Coastal Esplanade. As a result of the Waitara Lands Act and subsequent declaration under the Public Works Act 1981, the subject land has become part of the legal road reserve. Approximate location of sewer outfall pump station Figure 1: Operative District Plan Map A41 3. The nature of the proposed work is: The New Plymouth District Council proposes to designate a site containing the existing Waitara Sewer Outfall Pump Station. The Waitara Sewer Outfall Pump Station is an integral part of the Waitara sewer system. This pump station only operates in emergency situations. It is connected to the Waitara Sewer Pump Station. If the Waitara Sewer Pump Station fails then the Waitara Sewer Outfall Pump Station will pump wastewater out to sea. Resource consent (7861-1) is held by the Council which enables wastewater and stormwater to be discharged at a location approximately 1250 metres off shore from the mouth of the Waitara River during emergency situations. The resource consent allows for discharges to occur only as a consequence of high rainfall events when the instantaneous pump rate at the pump station exceeds 280 litres per second, or when the inflow to the pump station exceeds 18,800m³ of wastewater in the previous 24 hours. Up to 8000m3 of wastewater can be stored in an above ground tank and 700m³ of wastewater can be stored in an underground pipe. New Plymouth District Council proposes to designate the site containing this existing infrastructure for the purpose of providing for the protection of this asset, providing increased visibility within the District Plan and providing flexibility to modify infrastructure as required to meet changing requirements or new technology. Designating the site also provides certainty for adjacent properties as the designation signals the intended and ongoing use of the site. The designation of the site will not alter the existing use of the site. 4. The nature of the proposed conditions that would apply is: No conditions are considered necessary given the nature of the designation as the infrastructure has already been established on the site. 5. The effects that the public work will have on the environment, and the ways in which any adverse effects will be mitigated, are: Visual Effects The site is located off Marine Park Road which branches off West Beach Road (see figure 2 below). The site contains the Waitara Sewer Outfall Pump Station which was constructed on the site in 1977. The site forms a part of the larger Marine Park. The site is located to the north east of the Waitara Boating Club which also is accessed from Marine Park Road. Waitara Sewer Outfall Pump Station Figure 2: Location of Waitara Sewer Outfall Pump Station Figure 3: Proposed Designation Boundaries The proposed designation contains the Waitara Sewer Outfall Pump Station. The area to be designated consists of a building with an area of approximately 175m² containing three large pumps which enable discharge offshore in an emergency situation. A smaller pump is also located within the building which pumps wastewater back into the reticulated system. As the infrastructure already exists the designation of the site will not result in a change to the existing use that would give rise to any adverse effects on character and amenity. Figure 4: Waitara Sewer Outfall Pump Station from Marine Park Road Noise The Waitara Sewer Outfall Pump Station only operates in emergencies and is therefore used infrequently. When in operation noise generated from the existing site is limited and does not result in adverse noise effects beyond the boundaries of the proposed designated site. Any noise generated achieves compliance with the requirements of the Operative District Plan. As the infrastructure already exists the designation of the site will not result in an increase in noise from the site or a change to the nature of the site. Traffic and Parking Access to the site is currently gained via Marine Park Road which extends off West Beach Road. Vehicle movements to the site are infrequent with the site being accessed less than once a month for maintenance purposes. The designation of the site will not generate additional vehicle movements to the site or result in a change to the existing access arrangement. Maintenance vehicles park on the access driveways at the outfall pump station. No changes are proposed to the existing parking and access arrangement. As the infrastructure already exists the designation of the site will not impact adversely on traffic or parking. District Plan Objectives and Policies The proposal will not be inconsistent with the National, NZ Coastal or Regional Policy Statements, Proposed Regional Policy Statements, District Plan or Proposed District Plan. The following objectives and policies of the Operative District Plan are considered of relevance in regard to the proposed designations: Character and Amenity • Objective 1: To ensure activities do not adversely affect the environmental and amenity values of areas within the district or adversely affect existing activities. • Policy 1.1: Activities should be located in areas where their effects are compatible with the character of the area. • Policy 1.2: Activities within an area should not have adverse effects that diminish the amenity of neighbouring areas, having regard to the character of the receiving environment and cumulative effects. Network Utilities • Objective 3: To ensure public works and network utilities do not adversely affect the health and safety of the community. • Policy 3.1: The establishment, operation, maintenance and upgrading of public works and network utilities should not compromise public health or safety. The proposed designation relates to a site within which infrastructure has already been established. Given this, the designation of the site will not result in adverse effects on the character or amenity of the surrounding area and compliance with objective 1 and policies 1.1 and 1.2 will be achieved. The proposed designation falls within the definition of a network utility under the Operative District Plan. Designation of the site will provide for the protection of existing assets and will not result in adverse effects on the health and safety of the community in line with objective 3 and policy 3.1 of the District Plan. The protection of the outfall pump station via designation will ensure that the assets can continue to provide positive health and safety benefits for the community. 6. Alternative sites, routes, and methods have been considered to the following extent: No alternative sites, routes or methods have been considered as the proposed designation relates to a site owned by New Plymouth District Council containing existing infrastructure. 7. The public work and designation (or alteration) are reasonably necessary for achieving the objectives of the territorial authority because: Consideration must be given as to whether the work and designations are reasonably necessary for achieving the objectives of the requiring authority. The public work is essential to the New Plymouth District Council meeting its obligations under the Local Government Act 2002 (LGA) which specifies Council’s obligations and restrictions relating to provision of wastewater services. The Waitara Sewer Outfall Pump Station is necessary to provide the community of Waitara with wastewater services that can continue to function safely during emergency situations. The 2018-2028 Long Term Plan for the New Plymouth District addresses the importance of the wastewater reticulation network in collecting domestic and industrial wastewater before this is treated at the central New Plymouth Wastewater Treatment Plant. For the following reasons it was considered appropriate to pursue a designation: . A designation will enable flexibility to modify infrastructure at later stages as may be required due to changing requirements or new technology; . A designation will allow land required for the works to be clearly identified in the District Plan, clearly indicating the intended use of the land and; . A designation will prevent land uses and/or development that may hinder or prevent the works. The proposed designation will provide for the continued use protection of the Waitara Sewer Outfall Pump Station in line with the Long Term Plan for New Plymouth District Council. 8. The following resource consents are needed for the proposed activity and have (or have not) been applied for: New Plymouth District Council holds consent 7861-1 (6794) to discharge untreated municipal wastewater into the Tasman Sea via the Waitara Marine Outfall during high flow events at the Waitara Sewer Outfall Pump Station (previously the Waitara Wastewater Plant). This resource consent expires on 1st June 2041. In addition, New Plymouth District Council and Methanex are the consent holders for a consent to erect, place and maintain a structure known as the “Waitara Marine Outfall” and to occupy the associated space in the coastal marine area (4599).
Load more

Recommended publications
  • Map Plan and Report for Proposed Sewer District
    MAP, PLAN AND REPORT SEWER DISTRICT FORMATION SCHOHARIE BUSINESS PARK TOWN OF SCHOHARIE, NEW YORK MARCH 11, 2020 197 ELM STREET PO BOX 610 COBLESKILL, NEW YORK 12043 TABLE OF CONTENTS 1 Introduction 1 2 Wastewater System History 1 3 Existing Conditions 1 4 Evaluation of Facilities 5 5 Proposed Sewer District Options 7 6 Conclusion and Recommendations 8 APPENDICES A Schoharie Business Park Mapping B NYSDEC Correspondence C Existing Sewer System Schematic D Water Production Data E Existing SPDES Permit F Mapping of Sewer District Options G Proposed Improvements H User Cost Calculations I Proposed Sewer District Map and Description Page 1 1 INTRODUCTION The Schoharie Business Park (SBP) consists of 13 tax parcels as indicated on the mapping in Appendix A. The Business Park is currently served by private water and sewer systems and a private road network. Recently, NYSDEC has urged the Town to consider forming a Sewer District so that certain administrative and ownership issues related to the sewer system can be addressed. While the water system and the road network also have some technical issues that need attention, the scope of this Map, Plan and Report (MPR) only includes the Sewer System. 2 WASTEWATER SYSTEM HISTORY The wastewater system for the Schoharie Business Park was issued a discharge permit from NYSDEC in March of 2001. In 2002, Schoharie Park Sewage Works, Inc. was formed to operate the wastewater system under the NYS Transportation Corporation Law. In 2017, when many properties within the Schoharie Business Park were sold, Schoharie Park Sewage Works, Inc. was dissolved. This has left two options for the proper administration of the sewer system: 1) the current owner of the Schoharie Business Park (7 Summits, LLC) can form a new Transportation Corporation or 2) the Town of Schoharie can form a Sewer District.
    [Show full text]
  • Infiltration/Inflow Task Force Report
    INFILTRATION/INFLOW TASK FORCE REPORT A GUIDANCE DOCUMENT FOR MWRA MEMBER SEWER COMMUNITIES AND REGIONAL STAKEHOLDERS MARCH 2001 INFILTRATION/INFLOW TASK FORCE REPORT A GUIDANCE DOCUMENT FOR MWRA MEMBER SEWER COMMUNITIES AND REGIONAL STAKEHOLDERS MARCH 2001 Executive Summary This report is the product of the Infiltration/Inflow (I/I) Task Force. It has been developed through the cooperative efforts of the 43 Massachusetts Water Resources Authority (MWRA) member sewer communities, MWRA Advisory Board, The Wastewater Advisory Committee (WAC) to the MWRA, Charles River Watershed Association (CRWA), Fore River Watershed Association (FRWA), Mystic River Watershed Association (MRWA), Neponset River Watershed Association (NRWA), South Shore Chamber of Commerce (SSCC), Massachusetts Department of Environmental Protection (DEP), United States Environmental Protection Agency (EPA), and MWRA. The I/I Task Force recommends implementation of the regional I/I reduction goals and implementation strategies detailed in this report. The report outlines a regional I/I reduction plan with appropriate burdens and benefits for stakeholders. The report is intended to be a guidance document for use by local sewer communities, as well as other regional stakeholders, who may tailor appropriate aspects of the report recommendations to their unique situations. Severe storms in October 1996 and June 1998 led to the unusual circumstance of numerous sanitary sewer overflows (SSOs) from local and MWRA collection systems. In the aftermath of these events, EPA and DEP began an aggressive effort to make MWRA regulate flows from community sewer systems. MWRA recommended cooperative efforts by local collection system operators, as well as regulators and environmental advocates, would be more effective than a prescriptive, enforcement based approach.
    [Show full text]
  • Recommended Standards for Wastewater Facilities
    RECOMMENDED STANDARDS for WASTEWATER FACILITIES POLICIES FOR THE DESIGN, REVIEW, AND APPROVAL OF PLANS AND SPECIFICATIONS FOR WASTEWATER COLLECTION AND TREATMENT FACILITIES 2014 EDITION A REPORT OF THE WASTEWATER COMMITTEE OF THE GREAT LAKES - UPPER MISSISSIPPI RIVER BOARD OF STATE AND PROVINCIAL PUBLIC HEALTH AND ENVIRONMENTAL MANAGERS MEMBER STATES AND PROVINCE ILLINOIS NEW YORK INDIANA OHIO IOWA ONTARIO MICHIGAN PENNSYLVANIA MINNESOTA WISCONSIN MISSOURI PUBLISHED BY: Health Research, Inc., Health Education Services Division P.O. Box 7126 Albany, N.Y. 12224 Phone: (518) 439-7286 Visit Our Web Site http://www.healthresearch.org/store/ten-state-standards Copyright © 2014 by the Great Lakes - Upper Mississippi River Board of State and Provincial Public Health and Environmental Managers This document, or portions thereof, may be reproduced without permission if credit is given to the Board and to this publication as a source. ii TABLE OF CONTENTS CHAPTER PAGE FOREWORD ..................................................................................................................................... v 10 ENGINEERING REPORTS AND FACILITY PLANS 10. General ............................................................................................................................. 10-1 11. Engineering Report Or Facility Plan ................................................................................ 10-1 12. Pre-Design Meeting ....................................................................................................... 10-12
    [Show full text]
  • Design Standards for Stormwater Detention and Retention for Pima County
    Pima County Regional Flood Control District Design Standards for Stormwater Detention and Retention Supplement to Title 16, Chapter 16.48, Runoff Detention Systems Floodplain and Erosion Hazard Management Ordinance Pima County Regional Flood Control District 97 E. Congress St., 3rd Floor Tucson, AZ 85701-1791 (520) 724 -4600 June 2014 _________________ Design Standards for Stormwater Detention and Retention for Pima County REVISIONS Because of ongoing regulatory and technical changes in the fields of floodplain and stormwater management, revisions to this manual will be required from time to time. Such revisions will be approved by the Floodplain Administrator. Hard copy (printed) revisions will not be distributed. It is the holder’s responsibility to keep the document current by periodically checking the Regional Flood Control District’s web page for new digital versions. The revision history of the document is listed below. Chronology of Publication, Updates and Revisions Description Date First Edition June 2014 Chapter 6 Revised to Include Benefits of February 2015 Multiple-Use Basins I _________________ Design Standards for Stormwater Detention and Retention for Pima County TABLE OF CONTENTS No. Description Page No. 1. INTRODUCTION ................................................................................................. 1 1.1 Purpose ......................................................................................................................1 1.2 Ordinance Overview and Detention Requirements ..................................................2
    [Show full text]
  • Type of Waste Treated Wastewater Outfall Number 001 Outfall Location
    Expiration Date: November 30, 2015 Permit Number: 101694 File Number: 71832 Page 1 of 16 Pages NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM WASTE DISCHARGE PERMIT Department of Environmental Quality Western Region - Salem Office 750 Front Street NE, Suite 120, Salem, OR 97301-1039 Telephone: (503) 378-8240 Issued pursuant to ORS 468B.050 and The Federal Clean Water Act ISSUED TO: SOURCES COVERED BY THIS PERMIT: City of Powers Outfall Outfall PO Box 250 Type of Waste Number Location Powers, OR 97466 Treated Wastewater 001 R.M. 28.0 FACILITY TYPE AND LOCATION: RECEIVING STREAM INFORMATION: Trickling Filter - High Rate Basin: South Coast POWERS STP Sub-Basin: Coquille 285 E CEDAR ST POWERS Receiving Stream: South Fork Coquille River LLID: 1241417430803 28.0 D Treatment System Class: Level II County: COOS Collection System Class; Level I EPA REFERENCE NO: OR0026930 Issued in response to Application No. 968383 received October 5,2010. This permit is issued based on the land use findings in jhe permit record. •7 Steve Sclmurbusch Acting Water Quality Manager Western Region North PERMITTED ACTIVITIES Until this permit expires or is modified or revoked, the permittee is authorized to construct, install, modify, or operate a wastewater collection, treatment, control and disposal system and discharge to public waters adequately treated wastewaters only from the authorized discharge point or points established in Schedule A and only in conformance with all the requirements, limitations, and conditions set forth in the attached schedules as follows: Page Schedule A - Waste Discharge Limitations not to be Exceeded 2 Schedule B - Minimum Monitoring and Reporting Requirements....
    [Show full text]
  • Hydraulics Manual Chapter 13 APPENDIX F – STORM DRAINAGE
    Storm Drainage 13-F-1 APPENDIX F STORM DRAINS 1.0 Introduction This appendix provides information for the planning and hydraulic design of storm drainage systems. The methodology is intended for those with an understanding of basic hydrologic and hydraulic concepts and principles. Hydrologic concepts were discussed in Chapter 7. Important hydraulic principles include flow classification, conservation of mass, conservation of momentum, and conservation of energy. These elements were introduced in Chapter 8. Guidance on procedures to evaluate energy losses associated with storm drain systems is provided in Appendix G. A storm drain is that portion of the highway drainage system which receives surface water through inlets and conveys the water through a network of pipes to an outfall (see figure below). It is composed of different lengths and sizes of pipe connected by appurtenant structures. A section of pipe connecting one inlet or appurtenant structure to another is termed a "segment" or "run". Appurtenant structures include inlet structures (excluding the actual inlet opening), access holes, junction chambers, and other miscellaneous structures. LEFT BRANCH 4 RIGHT BRANCH 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 1 3 1 1 1 2 2 1 1. Lateral storm drain 5 2. Submain storm drain 3. Main or trunk storm drain 5 4. Intercepting storm drain 5. Outfall storm drain Manhole CREEK Typical Closed Conduit Storm Drain System Storm drain system design begins after inlet capacity and spacing (Appendix D) have been determined. Then, on a drainage system map, the connecting pipes, access holes, direction of flow, outfall location, existing drainage features and any necessary horizontal/vertical adjustments to avoid existing utilities would be documented.
    [Show full text]
  • Outfall Design and Construction
    OUTFALL DESIGN AND CONSTRUCTION CONTENTS: Drawing No. 1158-2413 Drawing No. 1158-2414 Drawing No. 1158-2415 Drawing No. 1158-2416 Drawing No. 1158-2417 Drawing No. 1158-241 8 Drawing No. 1 158-2419 Outline Description of Outfall Design and Construction For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 25-07-2013:22:43:47 - WWTP SITE BOUNDARY - PRIMARY DISCHARGE 1. ALL LEVELS SHOWN REWTETOORMiANCE IURYE" MWU AT MLLINHViD I I I I , Clnt For inspection purposes only. Consent of copyright owner required for any other use. LOUTH COUNTY COUNCIL DROGHEDA WASTE WATER DISCHARGE LICENCE APPLICATION PRIMARY D SCrlARGE PO hT COhSTR,CTION 8 DES GN <SECTION 1 ATTACHMENT C.2 L Pm* 0-r. MICHAEL F. GARRlCK EPA Export 25-07-2013:22:43:47 - WWTP SITE BOUNMRY I For inspection purposes only. Consent of copyright owner required for any other use. SECTION I ATTACHMENT CE EPA Export 25-07-2013:22:43:47 WWTP SITE BOUNDARY STORM WATER For inspection purposes only. Consent of copyright owner required for any other use. DROGHEDA WASTE WATER I DlSCnARGE LlCEhCE KEY PLAN SECTlONl#ZWtCHMENT C.B& mpnr(ql: cwSp we RK E S. SEPT '07 EPA Export 25-07-2013:22:43:47 WWTP SITE / CONCRETE APRON I BOUNDARY ON TlhdBER PILES % STDW WATER c OVERPLBW DWOHARGE For inspection purposes only. Consent of copyright owner required for any other use. DROGHEDA WMTE WRTER DISZHARGE LICEMCE rx. STORM WATER OVERFLOW DISCHARGE POIMTS CONSTRUCTION % DESIGN SHEET 1 OF 4 ,( ,( SECTIONd.ATPACHMENT l2.Z.k EPA Export 25-07-2013:22:43:47 STORM WATER OVERFLOWDISCHARGE POINTS For inspection purposes only.
    [Show full text]
  • Sewer Odor Control Master Plan
    CITY OF LOS ANGELES SEWER ODOR CONTROL MASTER PLAN Wastewater Engineering Services Division Bureau of Sanitation AUGUST 2011 2011 Odor Control Master Plan TABLE OF CONTENTS Chapter Title Page ACRONYMS AND ABBREVIATIONS......................................................................... 3 EXECUTIVE SUMMARY .............................................................................................. 5 INTRODUCTION ..................................................................................................................................... 5 EVALUATION OF THE COLLECTION SYSTEM................................................................................. 6 RECOMMENDATIONS/CONSIDERATIONS ....................................................................................... 7 1.0 INTRODUCTION................................................................................................. 9 1.1 HISTORY OF THE SEWER SYSTEM................................................................................................. 9 1.2 ODOR GENERATION ..................................................................................................................... 9 1.3 HISTORY OF ODOR CONTROL..................................................................................................... 10 1.4 COLLECTION SYSTEM SETTLEMENT AGREEMENT AND ORIGIN OF THE MASTER PLAN .............. 13 1.5 PURPOSE AND OBJECTIVES......................................................................................................... 13 1.6 TASK DESCRIPTIONS
    [Show full text]
  • Philadelphia Stormwater Manual V2.1 Philadelphia Stormwater Manual V2.1 This Pageintentionallyleftblank Simplified Approach Design Criteria Rooftop Systems
    7 Stormwater Management Practice Design Guidelines 7.1 Green Roofs 7.2 Rain Barrels and Cisterns 7.3 Filter Strips 7.4 Filters 7.5 Bioinfiltration / Bioretention 7.6 Detention Basins 7.7 Berms and Retentive Grading 7.8 Swales 7.9 Constructed Wetlands (see PA Stormwater BMP Manual) 7.10 Ponds & Wet Basins (see PA Stormwater BMP Manual) 7.11 Subsurface Vaults 7.12 Subsurface Infiltration 7.13 Porous Pavement 7.14 Pre-fabricated and Proprietary Designs (see PA Stormwater BMP Manual) 7.15 Inlet and Outlet Controls Philadelphia Stormwater Manual v2.1 This Page Intentionally Left Blank Philadelphia Stormwater Manual v2.1 Simplified Approach Design Criteria Rooftop Systems This section provides the following information about eco-roofs and roof gardens: S Typical cross section S Description S General specifications S Checklist of minimal information to be shown on the permit drawings S Construction inspection requirements and schedule S Link to landscaping requirements S Link to example landscaping plans S Link to operation and maintenance requirements S Link to photos 7.1 S Link to drawings 7.1 S Eco-roof Central City F.A.R. bonus guidelines Green roofs (vegetated roof/eco roof/roof garden) consist of a layer of vegetation that completely covers an otherwise conventional flat or pitched roof. The hydrologic response of a green roof bears closer resemblance to a lawn or meadow than impervious surface. The green roof system is composed of multiple layers including waterproofing, a drainage City of Portland, OR layer, engineered planting media, and specially selected plants. Vegetated roof covers can be optimized to achieve water quantity and quality benefits.
    [Show full text]
  • Wastewater Marine Disposal Through Outfalls on the Coast of São Paulo State – Brazil: an Overview
    artigos técnicos Wastewater Marine Disposal through Outfalls on the coast of São Paulo State – Brazil: An overview Jayme Pinto Ortiz* | Jacqueline Pedrera Yanes | Antonio Braulio Neto DOI 10.4322/dae.2016.015 Abstract According to the water’s fitness for bathing/swimming Report of 2011, São Paulo state coast has a population of over two million people, which can be duplicated in the summer and only reaches a wastewater collection rate of 56% on average. In the recent years, the investments of São Paulo government and of the Japan Bank have allowed a significant improvement in the collection rates and in the treatment of wastewater in the São Paulo coast. However, it remains necessary to improve the technical alternatives with a more wide vision of problem. The aim of this work is to present an overview of sewage disposal through submarine outfalls in the coast of São Paulo state, as well as, discuss new alternatives to be considered, to help the decision makers in the choose among wastewater treatment systems alternatives, taking into consideration the technical solutions, the cost benefit analysis, the environmental impact and the current environmental legislation, looking maximizing sus- tainable development in the region. Keywords: submarine outfalls, domestic wastewater, computational simulation, environment preservation, modeling. Sumário De acordo com o Relatório de balneabilidade de 2011, o litoral de São Paulo tem uma população de mais de dois milhões de pessoas, que pode ser duplicada no verão e só atinge uma taxa de coleta de águas residuais de 56% em média. Nos últimos anos, os investimentos do governo de São Paulo e do Banco do Japão têm permitido uma melhora significativa nas taxas de coleta e no tratamento de águas residuais na costa de São Paulo.
    [Show full text]
  • Ephemeral Stormwater Outfall Restoration Park Drive RSC Fort Dupont Park (National Park Service), SE Washington DC Dcwater
    Ephemeral Stormwater Outfall Restoration Park Drive RSC Fort Dupont Park (National Park Service), SE Washington DC DCWater Project Goals: • Provide stable conveyance ofofof 100100100- 100 ---yearyear storm event through thethethe design ofofof boulder cascades andandand cobble riffles, thus minimizing sediment loading tototo receiving stream channel, • Minimize impacts tototo well vegetated, steep slopes past thethethe gully’s toptoptop ofofof bank • Maximize nutrient uptake andandand improve water quality tototo thethethe unnamed tributary ofofof thethethe Anacostia River bybyby promoting infiltration, detention, andandand seepage through thethethe sand/mulch fill,fill,fill, which increases denitrification andandand sediment filtering, • Dissipate energy atatat thethethe existing outfall discharge point through thethethe design ofofof aaa series ofofof dissipation poolspools. ... Additional Project Benefits: • Enhance thethethe ecological functions ofofof thethethe sitesitesite through thethethe recharging ofofof groundwater andandand creation ofofof riffle/pools complexes, • Attenuate stormwater peak discharges tototo thethethe downstream, unnamed tributary ofofof thethethe Anacostia River through thethethe conversion ofofof surface flow tototo subsubsub- sub ---surfacesurface flow, • Preserve valuable over story trees bybyby minimizing construction impacts tototo thethethe adjacent woodlands, • Install aaa viable demonstration project tototo showcase costcost- ---effectiveeffective andandand ecologically appropriate restoration techniquestechniques.
    [Show full text]
  • New Schedule Clarification for Sewage Pumping Stations Vs
    CLARIFICATION PUMPING STATIONS vs SEWAGE TREATMENT PLANTS Pumping Stations are sewage works located throughout the collection system that pump the sewage from a low area directly to a Sewage Treatment Plant or up into a gravity sewer so it can continue flowing to the Sewage Treatment Plant. They are generally comprised of a wet well, pumps and a forcemain and are often located in residential areas. The Municipal Class EA Project Schedules set out criteria to classify pumping stations, specifically; Schedule A ( 2) - Increase pumping station capacity by adding or replacing equipment where new equipment is located within an existing building or structure and where the existing rated capacity is not exceeded; Schedule A+ (3) - Increase pumping station capacity by adding or replacing equipment and appurtenances, where new equipment is located in an existing building or structure and where its existing rated capacity is exceeded; Schedule B (8) - Construct new pumping station or increase pumping station capacity by adding or replacing equipment and appurtenances, where new equipment is located in a new building or structure; and Schedule C - NA Sewage Treatment Plants are located at the end of the sewage collection system where they treat the sewage before discharge to the environment. They are generally located in an isolated area with a buffer to sensitive land uses. Sewage Treatment Plants are generally comprised of: headworks - where the sewage is lifted, screened and grit removed; clarifiers - tanks where solids in the sewage are settled and removed; Aeration tanks - tanks where air is added for the biological stabilization of organic matter; solid handling system - where solids, from sewage, are collected, dewatered, stabilized and then released into the environment; disinfection - where final effluent is treated before discharge; and outfall - pipe/conduit that discharges treated effluent to the environment.
    [Show full text]