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Dec 11, 2023 182 likes •602 views

Subregional Approach to Water Reuse Presented by: Andrew Gilmore, P.E. Who is Victor Valley Wastewater Reclamation Authority? Who is VVWRA? VVWRA Service Area VVWRA 215 sq. miles 200,000 residents 40.5 miles sewers 2 pump

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SLIDE 1

Subregional Approach to Water Reuse

Presented by:

Andrew Gilmore, P.E.

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Who is Victor Valley Wastewater Reclamation Authority?

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Who is VVWRA?

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VVWRA Service Area

VVWRA

  • 215 sq. miles
  • 200,000 residents
  • 40.5 miles sewers
  • 2 pump stations
  • 1 regional WRP
  • 18 mgd
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VVWRA from Centralized Treatment to Subregional Approach

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Subregional Approach Objectives

To reduce dependency

  • n groundwater

Implement regional water planning goals To conserve potable water

REDUCE

1st

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Subregional Approach Objectives

Benefit Member Agencies - reuse Provide additional treatment and collection capacity Relieve pressure on main interceptors

REDUCE

1st

Reduces need to expand Regional WRP

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Elements of the Subregional Project

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SLIDE 9
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Sewer force main (WAS and excess) Conversion force main to reuse line Modifications to existing Lift Station WRP, 1 mgd initial 4 mgd ultimate Percolation basins at golf course

01 02 03 04 05

Subregional Project Elements Town of Apple Valley

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Apple Valley WRP Was Sited in Brewster Park

Existing Park Existing Homes

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Otoe Rd lift station Existing sewer force main to be reused for reclaimed water Apple Valley WRP New reclaimed water force main to Golf Course New sewer forcemain POC to existing sewer

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Subregional Project Elements City of Hesperia

WRP , 1 mgd initial 4 mgd ultimate

01

Diversion from interceptor

02

Lift Station

03

Force Main

04

WAS force main

05

Percolation basins

06

Offsite Improvements

07

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Hesperia WRP Will be Located in Residential Area

Existing Retention Basin Future Homes Existing Homes Offsite Improvements

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Diversion Box Gravity Line Lift Station Sewage Force Main WAS Force Main

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Subregional WRPs Will Produce High Quality Recycled Water

CA Title 22 Disinfected Tertiary Recycled Water

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Parameter VVWRA Proposed Effluent Limit Title 22 Water Recycling Criteria Draft Regulation for Groundwater Recharge Reuse Recommended Effluent Design Criteria pH 6.5 - 8.5

  • 6.5 - 8.5

BOD5 (mg/L)

  • Avg. Monthly

10 10

  • Avg. Weekly

15 15

  • Max. Daily

30 30 TSS (mg/L)

  • Avg. Monthly

10 10

  • Avg. Weekly

15 15

  • Max. Daily

30 30 Total N (mg/L)

  • 5

8 / 4 a Turbidity (NTU)

  • 24-hr 5% of time sample max.

0.2 0.2 Any time max. 0.5 0.5 Total Coliform (CFU/100 mL)

  • 7-day median max.

2.2 2.2 30-day one sample max. 23 23 Single sample max. any time 240 240

5 8 / 4

Title 22 Reclaimed Water Quality with a Twist

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Unique Design Approach Used One-Plant Concept

  • Streamlined design

development & reviews

  • Reduced design &

construction costs

  • Common operations &

maintenance

  • Shared training, spare parts,

consumable

4

Benefits One design for both Member Agencies One set of construction documents & One Contractor Two separate plants

3 2 1

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Both WRPs Were Developed as One Design Model

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Brief History of the Path to the Subregionals

Sewer Master Plan Includes Subregional WRPs

1994

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Carollo Carollo Begins Prelim Design Logan Olds Hired as General Manager

2006 2008

RFP Issued for WRP Design

2009

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Percolation and Reuse Design Added WRPs at 100% Design

2011 2012 2013

Member Agency Conditional Use Permit Conditions Addressed

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Bidding Phase Commenses

2014 July

Funding Obtained

2014 June

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2011 WRPs at 100% Design 2012 Percolation and Reuse Design Added 2013 Member Agency Conditional Use Permit Conditions Addressed June 2014 Funding Obtained July 2014 Bidding Phase Commences

20 Years in the Making

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Prop 84 Mohave Water Agency Bureau of Reclamation State Revolving Funds

Funding Approach

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Prop 84 $3,000,000 SRF $4,000,000 BOR $5,000,000

VVWRA Obtained $12M in Funding

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Public Outreach and Member Agency Approvals

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Existing Influent Lift Station Future WRP Existing Park

Apple Valley WRP Incorporated Existing Facilities

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Focus on Blending into Park Settings

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What will I smell? What will I hear? What are the chemical hazards that could spill into

  • ur communities?

What will I see? Will there be fecal matter in the air?

Hesperia Community Comments

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Odor Control Approach

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SLIDE 32
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Hesperia WRP Proximity to Homes

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Illustration of Height

  • f WRP
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Site of Screening of Perc Ponds

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View of WRP Entrance

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View as Residents Leave for Work

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View as Residents Head Home from Work

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Questions

agilmore@carollo.com

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Thank You