Project Area: Outfall IJKL

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Asher Curtis
5 years ago
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1 Project Area: Outfall IJKL Outfall IJKL is a stormwater drainage pipe at the west end of Crissy Field. Location of Extended Outfall Restricted Beach Access Work Area Manhole Modification CRISSY FIELD DRAINAGE IMPROVEMENT PROJECT

What s Happening Now Sand buildup caused by tides and weather buries the

Current beach outfall after excavation Outfall manhole access on Crissy

problems upstream in the Crissy Field and Mason Street areas.

2 What s Happening Now Sand buildup caused by tides and weather buries the existing pipe and necessitates frequent excavation. Current beach outfall after excavation Outfall manhole access on Crissy Beach Existing Outfall The blocked pipe contributes to ongoing flooding problems upstream in the Crissy Field and Mason Street areas. Maintenance of the outfall is difficult and time-consuming due to a narrow access manhole. PURPOSE & NEED

3 The Proposed Solution Widen the existing drainage pipe (Outfall IJKL ) and extend it into the bay. Increase drainage capacity, reducing sand buildup and alleviating flooding problems. Accommodate stormwater runoff from the Presidio Parkway project and future parkland improvements, and take into account the 50-year projected beach accretion. Enlarge the access manhole on Crissy Field, facilitating future maintenance and protection of the area. Existing Outfall Extended Outfall QUICK FACTS Work Area Manhole Modification Length of extension: 296 feet Total length of completed pipeline: 466 feet Diameter of new pipe: 54 inches PROJECT PROCESS & SCHEDULE

4 Installation Process & Schedule Stage 1 May 15 July 31, 2015 Stage 2 June 1 July 31, 2015 Stage 3 June 1 September 15, 2015 BEACH ZONE INTERTIDAL & OFF-SHORE ZONE BAY ZONE Removal of existing pipe and installation of the first section of extended pipe Installation of the second section of extended pipe Installation of the last section of pipe Existing Manhole Existing Outfall Pipe Existing Beach Outfall Signage on the terminal pile will indicate the presence of a submerged pipe. Intertidal Zone High Tide (MHHW) Low Tide (MLLW) Extended Outfall Pipe Bay Bottom Profile View BEACH ZONE Existing Piles to be Modified INTERTIDAL ZONE OFF-SHORE ZONE New Piles BAY ZONE The staged installation of the outfall is scheduled to avoid impacts to wildlife, particularly the Snowy Plover, and to comply with complex land access restrictions. May 2015 June 2015 July 2015 August 2015 September 2015 STAGE 1: Beach Zone STAGE 2: Intertidal Zone STAGE 3: Bay Zone PROJECT PROCESS & SCHEDULE

5 Installation Process & Schedule Stage 1 May 15 July 31, 2015 Stage 2 June 1 July 31, 2015 Stage 3 June 1 September 15, 2015 BEACH ZONE INTERTIDAL & OFF-SHORE ZONE BAY ZONE Removal of existing pipe and installation of the first section of extended pipe Installation of the second section of extended pipe Installation of the last section of pipe Timber Mat Turbidity Curtain Barge Outfall Pipe San Francisco Bay Existing Manhole Piles Air Bubbles Piles High Tide (MHHW) Tug Boat Barge Bird s Eye View Low Tide (MLLW) BEACH ZONE INTERTIDAL & OFF-SHORE ZONE BAY ZONE The staged installation of the outfall is scheduled to avoid impacts to wildlife, particularly the Snowy Plover, and to comply with complex land access restrictions. May 2015 June 2015 July 2015 August 2015 September 2015 STAGE 1: Beach Zone STAGE 2: Intertidal Zone STAGE 3: Bay Zone PROJECT PROCESS & SCHEDULE

6 Installation Stage 1: May 15 July 31, 2015 Stage 1 activities primarily occur on the beach area and will include removal of the old pipe and installation of the first section of the extended pipe. Timber Mat High Tide (MHHW) Outfall Pipe Existing Manhole Piles Bird s Eye View BEACH ZONE INTERTIDAL & OFF-SHORE ZONE BAY ZONE INSTALLATION ACTIVITIES AND EQUIPMENT: ENVIRONMENTAL PROTECTION MEASURES: Temporary fencing Removal of the existing Sand dune protection Beach restoration, and signage outfall pipe fencing including dune re grading, at the Timber mat Modification of 14 existing conclusion of Stage 1 piles to support the The timber mat provides access and protects the beach from construction equipment. extended outfall pipe First section of pipe Off-shore barges Off-shore barges will provide access, construction staging and temporary stockpile storage. PROJECT PROCESS & SCHEDULE

7 Installation Stage 2: June 1 July 31, 2015 Stage 2 activities occur in the intertidal and off-shore zones and will include the installation of environmental protection measures and the second section of the extended pipe. Turbidity Curtain Air Bubbles Piles Outfall Pipe High Tide (MHHW) Low Tide (MLLW) Bird s Eye View INTERTIDAL & OFF-SHORE ZONE INSTALLATION ACTIVITIES AND EQUIPMENT: ENVIRONMENTAL PROTECTION MEASURES: Off-shore barges Fourteen piles to support the extended outfall pipe Second section of pipe A turbidity curtain (inwater cloth screen) will contain turbid water and minimize impacts to the environment. Underwater air bubble systems will minimize underwater construction noise and prevent fish and marine wildlife from entering pile-driving areas. Turbidity curtain and air bubble system Removal of the turbidity curtain, air bubble system and construction access at the conclusion of Stage 2 PROJECT PROCESS & SCHEDULE

8 Installation Stage 3: June 1 September 15, 2015 Stage 3 activities occur in the bay zone and will include the installation of the last section of pipe and site restoration. Turbidity Curtain Barge Outfall Pipe San Francisco Bay Air Bubbles Piles Tug Boat Barge Bird s Eye View BAY ZONE INSTALLATION ACTIVITIES AND EQUIPMENT: ENVIRONMENTAL PROTECTION MEASURES: Off-shore barges Installation and removal of the air bubble system Ten piles in the bay zone Final site clean-up and restoration Final section of pipe PROJECT PROCESS & SCHEDULE

Environmental Protection & Stewardship: Crissy Beach Crissy Beach includes natural northern foredunes, which host beach vegetation, such as

Habitat Protection Measures Photo: Will Elder, NPS Northern Foredunes Photo: Flickr/Tom Hilton Photo: Flickr/Tom Hilton Photo: Flickr/Tang Heng

The beach and any impacted northern foredunes will be restored by the National Park Service once construction is complete.

Staged construction will occur during the summer months when the Snowy Plover is not present.

9 Environmental Protection & Stewardship: Crissy Beach Crissy Beach includes natural northern foredunes, which host beach vegetation, such as sand-verbena, beach strawberry and beach primrose. During August through April, the Western Snowy Plover rests and forages in the foredune habitat. Habitat Protection Measures Photo: Will Elder, NPS Northern Foredunes Photo: Flickr/Tom Hilton Photo: Flickr/Tom Hilton Photo: Flickr/Tang Heng Sand Verbena Beach Primrose Western Snowy Plover Fencing will be installed on the beach to protect all environmentally sensitive areas (ESAs). The beach and any impacted northern foredunes will be restored by the National Park Service once construction is complete. All contractor and subcontractor personnel will be required to undergo ESA training prior to entering the jobsite. Staged construction will occur during the summer months when the Snowy Plover is not present. Prior to construction, some existing vegetation will be temporarily relocated by the National Park Service to a nursery until construction is complete. Wildlife specialists will be on site to monitor wildlife and habitat protection. ENVIRONMENTAL IMPACT MITIGATION

Environmental Protection & Stewardship: San Francisco Bay The San Francisco Bay is home to a wide array of fish, including green sturgeon,

Photo: Flickr/Roger Tabor, USFWS Steelhead Trout Pile Driver A turbidity curtain and air bubble system will be Turbidity Control Curtain Clean

pollution. Example of Turbidity Control Curtain Bubble Ring Aquatic safety zones will be established to monitor for impacts to marine wildlife.

10 Environmental Protection & Stewardship: San Francisco Bay The San Francisco Bay is home to a wide array of fish, including green sturgeon, steelhead trout, salmon and smelt. Underwater construction best practices will be in place to minimize impacts to underwater and tidal habitats. Photo: Flickr/Roger Tabor, USFWS Steelhead Trout Pile Driver A turbidity curtain and air bubble system will be Turbidity Control Curtain Clean Water installed in the bay to protect fish and marine wildlife from underwater construction impacts, Turbid Water Pile including water and noise pollution. Example of Turbidity Control Curtain Bubble Ring Aquatic safety zones will be established to monitor for impacts to marine wildlife. Example of Air Bubble System Wildlife specialists will monitor for aquatic sound pressure and water pollution containment. ENVIRONMENTAL IMPACT MITIGATION

Ba or e -S h O ff O ff -S h or e rg e Ba rg e Construction Overview Bo at STAGE 1 Tu g Extended Outfall Timber Mat STAGE 2 Extended Outfall Turbidity Curtain STAGE 3 Crissy Beach Extended

11 Ba or e -S h O ff O ff -S h or e rg e Ba rg e Construction Overview Bo at STAGE 1 Tu g Extended Outfall Timber Mat STAGE 2 Extended Outfall Turbidity Curtain STAGE 3 Crissy Beach Extended Outfall Presidio Pro menade Northern Foredunes Environmentally Sensitive Areas Stockpile Area Crissy Field Existing Manhole (To Be Modified) Maso n Stre et Construction Access CONSTRUCTION IMPACTS

What to Expect from Construction Construction is expected to begin in May and continue into September. During construction, access to the beach work area will be restricted.

Public access to the Presidio Promenade and Crissy Field will be maintained, with occasional traffic control on the Promenade path.

12 What to Expect from Construction Construction is expected to begin in May and continue into September. During construction, access to the beach work area will be restricted. Standard work hours are 7:00 a.m. to 7:00 p.m., Monday through Friday, but may vary according to Presidio Promenade tidal conditions. Some weekend work may occur. Public access to the Presidio Promenade and Crissy Field will be maintained, with occasional traffic control on the Promenade path. The existing outfall will be cleared daily; this activity normally occurs throughout the year before, during and after rainfall. On-site signage and advisories will be Presidio Promenade provided to inform pedestrians, bicyclists and interested stakeholders of construction Crissy Field activity and temporary impacts. Mason Street Northern Foredunes Disturbed dunes will be restored prior to the conclusion of Stage 1. Grass sod will be restored prior to the conclusion of Stage 3. Timber Mat Fence Restricted Beach Access Occasional Pedestrian & Bicycle Traffic Control Manhole Modification CONSTRUCTION IMPACTS

Trans Mountain Expansion Project Overview

Trans Mountain Expansion Project Overview 1 Proposed Expansion Project $6.8-billion capital cost Expand capacity to 890,000 bpd Project scope 980 kms new pipe 12 new pump stations 19 new tanks 3 new tanker