Chromium-6 Water Treatment

Facilities Project

PGA WEST Town Hall Meeting

Coachella Valley Water District

April 12, 2016

Agenda

• Introductions

• Objectives

• Chromium 6 (Cr6) Project Overview

• WBA Treatment Facility Components

• Architectural Renderings

• Project Schedule

• Questions

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Objectives

• The project will benefit the Coachella Valley by treating

groundwater to meet the new State of California

mandated chromium-6 drinking water regulation that

became effective July 1, 2014

• Provide information and establish a dialogue with PGA

WEST

• Solicit community input on the building architecture and

landscaping

• Coordinate construction activities to meet the State of

California mandated compliance schedule

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Public Outreach

• See www.cvwd.org/cr6 for information on

legislation, background, and related documents

• Desert Sun articles

• Notice of Preparation July 10 to August 8, 2015

• Meeting with City of La Quinta January 2016

• Meetings with PGA WEST beginning in late

January 2016

• Future meetings

4

California’s Path

to Regulate Cr6

5

V.

Widespread

Natural

Occurrence

April 15, 2014

Court Order Cr6

MCL is set at

0.010 mg/L

(10 ppb)

Cr-6 Levels

1968

2008

• Cr6 MCL of 10 parts per billion (ppb) effective July 1, 2014

• Existing well levels from <1 to 21 ppb

• 31 wells expected to have Cr6 levels above 10 ppb

• 25 wells expected to have Cr6 levels between 8-10 ppb

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Cr6 Occurrence in CVWD Wells

Source of Supply Study

• Evaluation of treatment and non-treatment

alternatives

• Assessment of treatment technologies

– Weak-base Anion Exchange (WBA)

– Strong-Base Anion Exchange (SBA)

– Reduction-Coagulation-Filtration (RCF)

– Reverse Osmosis (RO)

7

Selection of Ion Exchange Treatment

• Proven effective treatment method

• Flexibility in accommodating future water

quality regulations

• Efficient residuals management

• Cost effective

8

Weak-Base Anion Exchange (WBA)

Carbon dioxide

for pH reduction

Bag

filters

Resin

vessels

Aeration or

Caustic

Treated

Water Raw

Water

Operations

• Bag filter replacement

• Carbon dioxide refills

• Resin replacement

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WASTE BRINE TANKS

WASTE BRINE TANKS

Strong-Base Anion Exchange (SBA)

Operations

• Regeneration

• Residuals treatment

and disposal

Brine

Tanks

TREATMENT OF SPENT

BRINE AND DISPOSAL OF

BRINE AND SOLIDS

Waste

Brine

Tanks

OFF-SITE

REGENERATION

Raw

Water

Bag

Filters

Resin

Vessels

Treated

Water

10

Compliance Schedule

• Federal drinking water standards receive

five-year compliance period

• Compliance schedule approved by State:

Finish Date

Complete CEQA Certification/Design Substantially Complete Jun 30, 2016

Start Construction Jul 31, 2016

Complete Construction - ID8 Dec 31, 2018

Complete Construction - Cove Jun 30, 2019

Begin Operations Oct 31, 2019

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La Quinta WBA Facilities

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WBA Site Selection Criteria

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Location selected to balance

environmental, social, & economic

concerns: • Size of property

• Property is owned by CVWD

• Water quality of nearby wells

• Existing pipeline infrastructure

• Distance from nearby homes

• Ability to screen exterior of facility

• Meet state-mandated compliance

period

Design Features

• Site architecture has been designed to

match the surrounding area

• Facilities meet City zoning requirements

for building height

• Facility will comply with City noise

ordinance (LQMC Section 9.100.210)

• Facility will not produce odors

• Golf course perimeter will be landscaped

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15

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Architectural Rendering – Airport Blvd

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Existing Conditions at Tee box

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Architectural Rendering – Tee box

19

Existing View from Backyards

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Architectural Rendering –View from Backyards

November 2015

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Architectural Rendering –View from Backyards

April 2016

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IMPLEMENTATION TIMELINE

Compliance Plan

Financing

Design

Construction

2012 2013 2014 2015 2016 2017 2018 2019

Environmental Review

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Chromium-6 Water Treatment Project Schedule La Quinta Facility

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Summary

• CVWD must comply with the new State of

California chromium-6 drinking water

regulation by the earliest feasible date

• Provide ongoing information and outreach

• Solicit community input on the building

architecture, color, and roof tile

• Coordinate construction activities with

PGA WEST

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COMMENTS AND QUESTIONS?

Please visit

www.cvwd.org/cr6

for additional information

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