Newman Lake Water Quality Background Information Megan Rounds - - PowerPoint PPT Presentation

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Newman Lake Water Quality Background Information Megan Rounds - - PowerPoint PPT Presentation

May 29, 2023 217 likes •601 views

Newman Lake Water Quality Background Information Megan Rounds Marianne Barrentine Colleen Little Ecology Spokane County Spokane County Tonights agenda Overview of Newman Lake Water Quality Wastewater treatment pilot study

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SLIDE 1

Newman Lake Water Quality

Background Information

Megan Rounds

Ecology

Colleen Little

Spokane County

Marianne Barrentine

Spokane County

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SLIDE 2

Tonight’s agenda

  • Overview of Newman Lake Water Quality
  • Wastewater treatment pilot study
  • Benefits of a successful pilot study

photo via newmanlake.com

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SLIDE 3

Aspiration

When I was young, my ambition was to be

  • ne of the people who made a difference

in this world. My hope is to leave the world a little better for having been there.

~Jim Henson ~Jim Henson

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SLIDE 4
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SLIDE 5

Findings

  • Algae blooms are

caused by nutrient loading.

  • Phosphorus and
  • Phosphorus and

nitrogen feed algae, causing rapid growth of algae blooms.

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SLIDE 6

Recommendations

Reduce loading to the lake from:

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SLIDE 7

Newman Lake Drainage

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SLIDE 8

Spokane County Parcel Map

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SLIDE 9
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SLIDE 10

What are we doing now?

  • Watershed management plan: Carried
  • ut by the District.
  • Public education: Resident associations

formed to educate property owners. formed to educate property owners.

  • Septic system survey: Completed by

Spokane Regional Health District in 1990.

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SLIDE 11

Septic Survey Findings

  • Most residences constructed before 1940 as

seasonal cabins

  • 307 lakefront homes
  • 550 total residences in watershed
  • 40% occupied year round
  • 40% occupied year round

photo via newmanlake.com

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SLIDE 12

Wastewater disposal system types

  • Outhouse
  • Cesspool
  • Septic tank with drain field
  • Leach bed or absorption pit
  • Holding tank
  • Holding tank
  • Portable toilet
  • Incinerator toilet
  • Drywell
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SLIDE 13

How A Septic System Works

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SLIDE 14

Spokane Regional Health District:

“An improperly designed, located, constructed

  • r maintained septic system can allow bacteria,

viruses, household chemicals and other contaminants into groundwater, creating the potential for serious human illness.”

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SLIDE 15

Water Cycle

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SLIDE 16

Groundwater and surface water flow toward the lake

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SLIDE 17

Groundwater Flow

20,000,000.00 25,000,000.00 30,000,000.00 35,000,000.00 40,000,000.00 CUBIC FEET/MONTH

  • 5,000,000.00

0.00 5,000,000.00 10,000,000.00 15,000,000.00 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec CUBIC FEET/MONTH DATE

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SLIDE 18

Phosphorus Test Results

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SLIDE 19

Clarity Readings

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SLIDE 20

Honeymoon Bay Pilot Project

Lindsay Chutas Kennet Bertelsen

Spokane Conservation District Morrison Maierle

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Why a pilot?

  • Lake water quality improvements
  • Need for a new septic option
  • Proving new options satisfy requirements
  • Demonstrate costs to homeowners
  • Demonstrate costs to homeowners

photo via newmanlake.com

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SLIDE 22

Project locations

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SLIDE 23

Honeymoon Bay Project Locations

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SLIDE 24

Busse MBR Pilot Site

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SLIDE 25

BioMicrobics MBR Pilot Site

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SLIDE 26

Small-Scale Enhanced Wastewater Treatment Systems

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SLIDE 27

Why Enhanced Treatment?

  • Significant increase in

effluent quality

  • Does not rely on soil for

treatment

  • Smaller physical footprint
  • Smaller physical footprint
  • Lower sludge production
  • Facilitates high level

disinfection

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SLIDE 28

Pilot Study Installation

  • Busse unit will be in a

Conex type container

  • BioMicrobics will retrofit

existing tankage

  • Plumbed inline with
  • Plumbed inline with

existing system, monitoring valve

  • Utilize existing discharge

location

Busse Packaged System BioMicrobics Retrofit

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SLIDE 29

Monitoring Program

  • Coordinated with state DOH
  • Monitoring per WAC 173-219
  • Limited disruption
  • Proposed sampling:

– WK 1: 1 daily – WK 2: 3-4 – WK 2: 3-4 – WK 3-4: Weekly – MO 2: Biweekly – MO 3-9: Monthly

  • System Treatment Abilities

– Nitrogen: 97.9% – Phosphorous: 98.1% – Fecal Coliforms: 99.99%

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System Costs (Estimate)

  • Units cost $30,000 - $40,000,

installed with anticipated life of 25-35 years

  • Distribution and disposal
  • Distribution and disposal

construction costs dictated by site conditions

  • Engineering and permitting

costs vary by complexity

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SLIDE 31

Pilot Project Outcomes

Megan Rounds

Ecology

Gary Garrett

Sacheen Lake resident

Sheila Pearman

Sacheen Lake resident

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SLIDE 32

Sacheen Lake

  • 314-acre lake
  • Maximum depth 40

feet

  • High rate of algae

Newman Lake

  • 1,272-acre lake
  • Maximum depth

30 feet

  • High rate of algae
  • High rate of algae

blooms

  • Eastern Washington

University completed lake study in 1991

  • High rate of algae

blooms

  • WSU completed

lake studies in 1974, 1986

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SLIDE 33

Sacheen Lake Lake

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SLIDE 34

Water Cycle

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SLIDE 35

What Does Success Look Like?

  • Potential for fewer algae blooms
  • Potential for higher clarity readings
  • Beautiful lake shore experience
  • Safe recreation
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SLIDE 36

Questions & discussion Questions & discussion

photo via newmanlake.com

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SLIDE 37

Lake Clarity and Nutrients