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Landsburg Facility Development Project Preliminary ... · PDF file 6/1/2011  · LANDSBURG FACILITY DEVELOPMENT PROJECT PRELIMINARY ENGINEERING REPORT DRAFT JUNE 2011 Prepared for:

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  • Landsburg Facility Development Project

    Preliminary Engineering Report

    DRAFT

    June 2011

  • LANDSBURG FACILITY DEVELOPMENT PROJECT

    PRELIMINARY ENGINEERING REPORT

    DRAFT

    JUNE 2011

    Prepared for: Seattle Public Utilities

    700 Fifth Avenue, Suite 4900 Seattle, WA 98124

    Prepared by:

    Project #135-12476-10001

  • i

    Seattle Public Utilities

    Landsburg Facility Development Project Preliminary Engineering Report

    Title Page No.

    Executive Summary .......................................................................................................................1 Background ................................................................................................................................................... 1 Landsburg Site Description ........................................................................................................................... 1 Master Plan Program Verification ................................................................................................................ 1 Site Investigations ......................................................................................................................................... 2 Utilities .......................................................................................................................................................... 3 Functional Requirements .............................................................................................................................. 3

    Chlorination System......................................................................................................................... 3 Fluoridation System ......................................................................................................................... 4 SCADA, Site Telecom and IT Systems ........................................................................................... 4

    Hatchery Integration ..................................................................................................................................... 4 Security Analysis .......................................................................................................................................... 4 Legal and Regulatory Requirements ............................................................................................................. 5 Site Development Alternatives ..................................................................................................................... 5 Evaluation of Alternatives ............................................................................................................................ 6 Recommendations ......................................................................................................................................... 6

    Highest Recommended Alternative ................................................................................................. 6 Second Highest Recommended Alternative .................................................................................... 7 Include the Sodium Hypochlorite Work in the Landsburg Permitting/Construction ....................... 7

    Chapter 1. Project Overview ........................................................................................................1 Objective ....................................................................................................................................................... 1 Landsburg Site Description ........................................................................................................................... 1 Project Approach .......................................................................................................................................... 2 Changes in Project Scope and Approach ...................................................................................................... 2

    Chapter 2. Program Verification ..................................................................................................1 2008 Master Plan Review ............................................................................................................................. 1 Site Tour ....................................................................................................................................................... 1 Interview Results .......................................................................................................................................... 6

    Operations ........................................................................................................................................ 6 Fish Program .................................................................................................................................... 8 Water Transmission and Treatment ................................................................................................. 9 SCADA and Communications ....................................................................................................... 10 Shared Facilities ............................................................................................................................. 11 Storage Facilities ............................................................................................................................ 11 Parking Requirements .................................................................................................................... 12 Circulation Requirements .............................................................................................................. 13 Landsburg Park Requirements ....................................................................................................... 13

    Updated Program ........................................................................................................................................ 13 Program Matrix .............................................................................................................................. 13 Recommended Changes to the Facility Inventory at Landsburg ................................................... 13

  • …TABLE OF CONTENTS

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    Chapter 3. Site Investigations .......................................................................................................1 Planning Zones.............................................................................................................................................. 1 Site Geotechnical Conditions ........................................................................................................................ 2

    Geotechnical Information ................................................................................................................ 2 Implications for Future Development .............................................................................................. 2

    Site Topographic Conditions ........................................................................................................................ 3 Site Surface Water Conditions ...................................................................................................................... 4

    Surface Water Flow and Management ............................................................................................. 4 Floodplain Mapping ......................................................................................................................... 4 Flood Control Plans ......................................................................................................................... 4 Wetlands .......................................................................................................................................... 4 Rainfall ............................................................................................................................................. 4

    Application of LEED Principals ................................................................................................................... 5 Site Transportation Features ......................................................................................................................... 7

    9 Road/Landsburg Road Intersection ............................................................................................... 7 9 Road .............................................................................................................................................. 8 Park Road ......................................................................................................................................... 8 Dam/Treatment Site ......................................................................................................................... 9

    Environmental Investigation ....................................................................................................................... 11 Assessment Methods ...................................................................................................................... 11 Findings ......................................................................................................................................... 12 Mitigation Opportunities and Restrictions ..................................................................................... 15

    Sunlight ...................................................................................................