santa barbara county department of public works and 14 sludge drying beds would be required when...

Download Santa Barbara County Department of Public Works and 14 sludge drying beds would be required when wastewater

If you can't read please download the document

Post on 11-Jun-2020

0 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Santa Barbara County Department of Public Works Resource Recovery and Waste Management

    PROJECT PROPONENT: Laguna County Sanitation District

    620 Foster Road Santa Maria, California 93455

    Contact: Martin Wilder - (805) 739-8755

    PREPARED BY: Padre Associates, Inc.

    1861 Knoll Drive Ventura, California 93003

    Proposed Final Mitigated Negative Declaration 13NGD-00000-00001

    Laguna County Sanitation District Wastewater Treatment Plant

    Sludge Drying Beds Upgrade Project

    June 10, 2013

    Project site

    Treatment Plant

  • LCSD Trea tmen t P lan t S ludge Beds Upgrade June 10 , 2013 M i t i ga ted Nega t i ve Dec la ra t ion Page i

    TABLE OF CONTENTS Section Page

    1.0 REQUEST/PROJECT DESCRIPTION ................................................................... 1

    1.1 Background ................................................................................................. 1

    1.2 Project Objectives ....................................................................................... 1

    1.3 Project Components .................................................................................... 1

    1.4 Construction Methods ................................................................................. 2

    1.5 Public Comments ........................................................................................ 3

    2.0 PROJECT LOCATION ............................................................................................ 3

    3.0 ENVIRONMENTAL SETTING ................................................................................. 4

    3.1 Physical Setting ........................................................................................... 4

    3.2 Environmental Baseline ............................................................................... 4

    3.3 Cumulative Projects .................................................................................... 4

    4.0 POTENTIALLY SIGNIFICANT EFFECTS CHECKLIST .......................................... 6

    4.1 Aesthetics/Visual Resources ....................................................................... 6

    4.2 Agricultural Resources ................................................................................ 8

    4.3 Air Quality .................................................................................................... 9

    4.4 Biological Resources ................................................................................... 13

    4.5 Cultural Resources ...................................................................................... 20

    4.6 Energy ......................................................................................................... 23

    4.7 Fire Protection ............................................................................................. 24

    4.8 Geologic Processes .................................................................................... 25

    4.9 Hazardous Materials/Risk of Upset ............................................................. 28

    4.10 Historic Resources ...................................................................................... 31

    4.11 Land Use ..................................................................................................... 32

    4.12 Noise ........................................................................................................... 34

    4.13 Public Facilities ............................................................................................ 35

    4.14 Recreation ................................................................................................... 36

    4.15 Transportation/Circulation ........................................................................... 37

    4.16 Water Resources/Flooding .......................................................................... 39

  • LCSD Trea tmen t P lan t S ludge Beds Upgrade June 10 , 2013 M i t i ga ted Nega t i ve Dec la ra t ion Page i i

    TABLE OF CONTENTS (CONTINUED) Section Page

    5.0 INFORMATION SOURCES .................................................................................... 43

    5.1 County Departments Consulted .................................................................. 43

    5.2 Comprehensive Plan ................................................................................... 43

    5.3 Other Sources ............................................................................................. 43

    5.4 References .................................................................................................. 44

    6.0 PROJECT-SPECIFIC AND CUMULATIVE IMPACT SUMMARY ........................... 46

    6.1 Significant Unavoidable Impacts ................................................................. 46

    6.2 Significant Mitigable Impacts ....................................................................... 46

    7.0 MANDATORY FINDINGS OF SIGNIFICANCE....................................................... 47

    8.0 PROJECT ALTERNATIVES ................................................................................... 48

    9.0 INITIAL REVIEW OF PROJECT CONSISTENCY WITH APPLICABLE SUBDIVISION, ZONING AND COMPREHENSIVE PLAN REQUIREMENTS ................................. 49

    9.1 Land Use Development Code ..................................................................... 49

    9.2 Land Use Element ....................................................................................... 49

    9.3 Agricultural Element .................................................................................... 51

    9.4 Orcutt Community Plan ............................................................................... 51

    10.0 RECOMMENDATION BY LEAD AGENCY STAFF ................................................. 52

    11.0 DETERMINATION BY ENVIRONMENTAL HEARING OFFICER ........................... 53

    12.0 ATTACHMENTS ..................................................................................................... 53

    TABLES Table Page

    1. Special-Status Plant Species of the Project Area ................................................... 14

    2. Special-Status Wildlife Species of the Project Area ................................................ 16

    APPENDICIES A Response to Comments

  • LCSD Trea tmen t P lan t S ludge Dry ing Beds Upgrade June 10 , 2013 M i t i ga ted Nega t i ve Dec la ra t i on Page 1

    1.0 REQUEST/PROJECT DESCRIPTION

    1.1 BACKGROUND

    The Laguna County Sanitation District (District) provides municipal wastewater collection, treatment and disposal for the unincorporated community of Orcutt and unincorporated portions of the city of Santa Maria as well as some incorporated areas of the city of Santa Maria. The District’s Wastewater Treatment Plant (Plant) is located at the western terminus of Dutard Road (see Figures 1 and 2).

    Currently, bio-solids (sewage sludge) from the primary and secondary clarifiers are stabilized in an anaerobic digester and pumped to drying beds comprised of rectangular areas surrounded by earthen berms. Bio-gas generated by the digester is cleaned to remove siloxane and hydrogen sulfide, and combusted in micro-turbines and/or a boiler to generate hot water to maintain the digester temperature at approximately 96 oF.

    The drying beds are located in the northern portion of the Plant (see Figure 2). The sludge is allowed to air dry, with excess water retained within the sludge drying beds. When the moisture content of the sludge is sufficiently reduced, the sludge is transported to a regional composting facility (Engel & Gray) on Ray Road in Santa Maria for the production of soil amendments. Sludge production is currently approximately 575 tons per year, based on an influent (wastewater) rate of 2.1 million gallons per day. Sludge production is anticipated to increase to approximately 1,370 tons per year, based on an influent rate of 5.0 million gallons per day by 2030.

    1.2 PROJECT OBJECTIVES

    The objectives of the project are to:

    1. Reduce the risk of groundwater contamination from percolation of sludge liquids to the underlying groundwater aquifer; and

    2. Improve sludge handling under current and future wastewater flows.

    1.3 PROJECT COMPONENTS

    The existing un-lined central sludge drying beds would be replaced with 14 concrete- lined beds at the same location (see Figure 3). The project footprint would be approximately 4.0 acres, within the existing 24 acre Wastewater Treatment Plant. Each new sludge bed would be would be 32 feet wide and 162 feet long. A 2.5 foot-tall concrete wall would be located parallel to each sludge bed to contain the sludge. A 12 foot-wide ramp would be located on the ends of each sludge bed, and would contain the sludge inlets. A below-grade, concrete-lined channel would be provided in the center of each sludge bed to capture decanted wastewater draining from the wet sludge. A 6 inch diameter perforated polyvinyl chloride pipe would be placed in the drain channel of each sludge bed and backfilled with pea gravel.

  • LCSD Trea tmen t P lan t S ludge Dry ing Beds Upgrade June 10 , 2013 M i t i ga ted Nega t i

Recommended

View more >