SODA ASH SYSTEM MONITORING PLAN Rev I (1).pdf

USCG Kodiak Water Treatment Plant

Soda Ash System Modifications

Soda Ash Monitoring Plan

Prepared For:

United States Coast Guard Kodiak, Alaska

Prepared By:

Stantec 2353 130th Avenue, NE, Suite 200

Bellevue, Washington United States of America

October 26, 2017

USCG Page i July 2017

Monitoring Plan

TABLE OF CONTENTS

INTRODUCTION

1.1. Sampling Locations

1.1.1. Housing, End of Distribution and Wastewater Treatment Plant

1.1.2. Coupon Stations

1.2. Sampling Frequency

1.3. Data Collection

LIST OF APPENDICES

Appendix A Sampling Location Map

USCG Page 1 October 2017

INTRODUCTION

This sampling and monitoring plan is being established to assess the effectiveness of the modified soda ash mixing and delivery system recently installed and commissioned for the United States

Coast Guard (USCG) at Base Kodiak. The plan will utilize samples collected from a combination of existing coupon stations, housing, locations near the end of distribution piping, and the municipal waste water treatment plant (WWTP) to evaluate how the new soda ash system has impacted overall drinking water quality and establishing an effective corrosion control treatment for the facility. The monitoring plan will assess the effectiveness of the soda ash system in reducing the corrosiveness of the drinking water, preventing lead and copper dissolution from pipes and fittings, and verifying if scaling if occurring.

1.1. Sampling Locations

Water samples will be collected and analyzed from various locations across the facility. These locations include some housing, end of the potable water distribution system, WWTP, and multiple existing coupon stations.

1.1.1. Housing, End of Distribution and Wastewater Treatment Plant

Base Kodiak has made several modifications to the piping within facility housing, barracks, and other support buildings. Recent monitoring has indicated a few locations are still showing increased concentrations of lead in potable water. Soda ash addition and elevated pH is a known method for controlling soluble concentrations of lead in drinking water. By monitoring the impacts of soda ash and elevated pH on water quality samples collected from these few locations, Stantec

Consulting Services Inc. “Stantec” and the USCG will be able to evaluate the effectiveness of the modified system at reducing soluble lead in potable water.

The following locations which show continuing high concentrations of lead in potable water will be monitored:

Building 7 Barracks 4 room 202, Building 7 Barracks water fountain located on the second floor, Building N45 Ready Crew Berthing rooms 4, and

Building N45 Ready Crew Berthing rooms 12

In addition to determining the impacts on lead concentrations, Stantec recommends evaluating the pH stability of the potable water across the drinking water system. For this reason additional water samples will be collected from the furthest ends of the potable water distribution system.

We have identified the wastewater treatment plant (potable water supply), fuel pier far, and building 3 (galley sink) as the points furthest away from any of the domestic water storage tanks.

Stantec will evaluate the drop in pH across the system as well as impacts on chlorine residual.

Chlorine residual analysis will be used to evaluate impacts on system disinfection at the elevated pH.

USCG Page 2 October 2017

Historic data of the municipal WWTP effluent indicates elevated concentrations of copper are present. Another way to measure effectiveness of soda ash is to monitor the WWTP effluent for changes in copper concentrations. A drop in copper would be indicative of reduced metals leaching within the potable water and wastewater piping systems. Samples of WWTP effluent will be routinely collected and analyzed for changes in copper concentration as well as lead and zinc.

1.1.2. Coupon Stations

Nine existing coupon stations will be used to collect water samples and will be used to further monitor and validate the effectiveness of the soda ash treatment system. Each coupon station consists of a copper and a steel coupon. The following existing coupon stations shall be used:

Building N-23 Water Treatment Plant

Building N-2 Wastewater Treatment Plant

Building 559 Buskin Lake Pumphouse

Building N-1 Public Works Garage

Building 576 ESU/LORSTA Offices

Building N-44 Nemetz Gazebo

Building N-41 Child Development Center

Building N-24 Steam Plant

Building 15 AIRSTA Hanger #3

1.2. Sampling Frequency

The housing, end of distribution, and WWTP effluent will be monitored once soda ash is fully implemented. The system pH will be monitored and adjusted in a step wise fashion until the soluble lead concentration is below regulatory action limits. The pH will be adjusted to 8.5, 9.0, and 9.4 to evaluate the impacts on soluble lead concentrations. This will allow for the USCG to slowly increase the pH of the potable water system over time. The data collected from various pH set points will be used to help establish the optimum operating pH to obtain effective corrosion control in the potable water system. Once the final system operating pH has been identified and soluble lead concentrations have been consistently below the regulatory action limits, the system will be monitored for no less than nine consecutive months to gather data to support achieving optimum corrosion control within the drinking water system. Samples will be collected once a month for nine months. This will provide adequate data for USCG, Stantec, and Alaska

Department of Environmental Conservation (ADEC) to evaluate if optimum corrosion control has been achieved.

Once lead concentrations are below regulatory action limits, the coupon stations will be monitored once a month for nine months. At the end of nine months, the coupons will be collected and sent

USCG Page 3 October 2017 off for analysis. New coupons will be installed at the start of the nine month monitoring cycle as part of the ongoing corrosion control monitoring plan.

Sample protocol

Six to eight hours prior to sampling, the faucets will be flushed for a period of 5 minutes, then they shall be sealed and labeled to prevent use of the faucet. After the six to eight hour waiting period, a sample will be taken.

1.3. Data Collection

Housing and End of Distribution System (WWTP, Fuel Pier Far, and Galley sink)

All location samples will be collected and analyzed on-site for:

pH

Temperature

Residual Chlorine

All location samples will be collected and shipped off-site for:

Alkalinity

Lead

Copper

Zinc

WWTP (wastewater)

WWTP Samples collected at the WWTP shall be measured in the field for:

pH

Temperature

Oxidation Reduction Potential (ORP)

Conductivity

DO

WWTP samples shall be collected and sent off-site for:

Copper

Lead

Zinc

Coupon Stations

Water samples collected from the coupon stations shall be measured in the field for:

USCG Page 4 October 2017 pH

ORP

Conductivity (EC)

DO

Temperature

Residual Chlorine

Additional samples collected at the coupon stations shall be sent off-site for laboratory analyses of:

Alkalinity, Lead, Low range iron

Copper, and

Zinc.

At the end of one year, the various scale coupons, steel and copper, shall be analyzed by an off-site laboratory to evaluate for corrosion and scaling.

Previous reports have made suggested improvements to the scale coupon monitoring which should be implemented to improve the accuracy of the study, these improvements include:

Measuring any pit depths if pitting occurs on the scale coupon

Ensure each coupon is centered, perpendicular to flow and not touching the pipe

Check the pipe flow is between 3 to 5 ft/s

Use plastic hardware to attach the coupons to prevent galvanic reactions and false high readings of corrosion.

The tables below are a summary of the sampling schedule and locations, and field and laboratory analyses for each sample.

USCG Page 5 October 2017

USCG Soda Ash Water Quality Sampling

Sampling

Date Stantec COC

SGS

Laboratory

Report

Number Th ir d D ra w

B u ild in g N

-1

P b lic

W o rk s

G ar ag e

B u ild in g

-2

W as te w at er

T re at m en t

B u ild in

A

IR

ST

A

H an ga r ild in g N

W at er T re at m en t P la n t

B u ild in g N

St ea m P la n t

B u ild in g N

-4

C h ild D ev el o p m en t C en te r

B u ild in g N

-4 em et z

G az eb o ild in g sk in

L ak e P u m p h o se ild in g

ES

U

/L O

R

ST

A O ff ic es

- - - 3/22/2017 17KOD002 1171209 x x x x x x x x x x x x x x x x x x x x x x x x x

- - - 3/29/2017 17KOD003 1171324 x x x x x x x x x x x x x x x x

- - - 4/5/2017 17KOD004 1171458 x x x x x x x x x x x x x x x x x x x x x x x x x

- - - 4/12/2017 17KOD005 1171597 x x x x x x x x x x x x x x x x

- - - 4/19/2017 17KOD006 1171716 x x x x x x x x x x x x x x x x

- - - 5/31/2017 17KOD010 1172879 x x x x x x x x x x x x x x x x x x x x x x x x x

6/1/2017 - -

6/1/2017 8/22/2017 83

- - - 6/5/2017 17KOD009 1173017 x x x x x x x x x x x x x x x x

- - - 6/7/2017 17KOD011 1173095 x x x x x x x x x x x x x x x x

- - - 6/14/2017 17KOD012 1173415 x x x x x x x x x x x x x x x x

- - - 6/21/2017 17KOD013 1173635 x x x x x x x x x x x x x x x x

- - - 7/12/2017 17KOD014 x x x x x x x x x x x x x x x x x x x x x x x x x

- - - 8/2/2017 x x x x x x x x

- - - 8/9/2017 x x x x x x x x x x x x x x x x x

- - - 8/16/2017 x x x x x x x x

8/22/2017 - -

8/22/2017 10/20/2017 60

- - - 8/23/2017 x x x x x x x x

- - - 8/30/2017 x x x x x x x x

- - - 9/6/2017 x x x x x x x x x x x x x x x x x

- - - 9/13/2017 x x x x x x x x

- - - 9/20/2017 x x x x x x x x

- - - 9/27/2017 x x x x x x x x

- - 10/4/2017 x x x x x x x x

- - 10/11/2017 x x x x x x x x x x x x x x x x x

- - 10/18/2017 x x x x x x x x

10/20/2017

10/20/2017 12/1/2017 43

- - - 10/25/2017 x x x x x x x x

- - - 11/1/2017 x x x x x x x x

- - - 11/8/2017 x x x x x x x x x x x x x x x x x

- - - 11/15/2017 x x x x x x x x

- - - 11/22/2017 x x x x x x x x

- - - 11/29/2017 x x x x x x x x

12/1/2017

12/1/2017 2/2/2018 64

- - - 12/6/2017 x x x x x x x x x x x x x x x x x

- - - 12/13/2017 x x x x x x x x

- - - 12/20/2017 x x x x x x x x

- - - 12/27/2017 x x x x x x x x

- - - 1/3/2018 x x x x x x x x x x x x x x x x x

- - - 1/10/2018 x x x x x x x x

- - - 1/17/2018 x x x x x x x x

- - - 1/24/2018 x x x x x x x x

- - - 1/31/2018 x x x x x x x x

2/2/2018

2/2/2018 10/31/2018 272

- - - 2/28/2018 x x x x x x x x x x x x x x x x x

- - - 3/28/2018 x x x x x x x x x x x x x x x x x

- - - 4/25/2018 x x x x x x x x x x x x x x x x x

- - - 5/30/2018 x x x x x x x x x x x x x x x x x

- - - 6/27/2018 x x x x x x x x x x x x x x x x x

- - - 7/25/2018 x x x x x x x x x x x x x x x x x

- - - 8/29/2018 x x x x x x x x x x x x x x x x x

- - - 9/26/2018 x x x x x x x x x x x x x x x x x

- - - 10/31/2018 x x x x x x x x x x x x x x x x x

11/1/2018 11/30/2018 30

Start Date End Date Duration in Days

Sampling Suspended

Sampling Suspended

Fuel Pier Coupons Bldg 7 Barracks RCB WWTP Bldg 3

Soda Ash system consistently running at pH=8.5

End of pH=8.5 setpoint run

Data summary report on monitoring plan to USCG and ADEC

Evaluate pH 9.0 results to date. Continue sampling for 1 additional month with increased flushing of several sample locations pH setpoint adjusted to 9.0

Weekly sampling

Sampling Resumed

Weekly sampling

Monthly monitoring resumes

Evaluate pH 9.0 results to date. pH step change to 9.4 if lead results are not showing consistenly below action levels at all locations

Weekly sampling

Evaluate pH 9.4 results

USCG Page 6 October 2017 lk al in it y

C o p p er

Le ad

Zi n c

E.

C o li

To ta l C o lif o rm

Te m p p H p H m V

O R

P

EC

m

S/ cm

EC

u

S/ cm

D O

Fr ee

C h lr o in e

To ta l C h lo ri n e

Fr eq u en cy

D ra ti n

Building 7 Barracks 4

Room 202 37 47 47 47 - - 47 47 47 47 47 47 47 47 47 Weekly 7

Mar-17 to

Jan-18

Building 7 Barracks 4

Upstairs Drinking Water Fountain 37 47 47 47 - - 47 47 47 47 47 47 47 47 47 Weekly 7

Mar-17 to

Jan-18

Building N45

Ready Crew Berthing Room 4 37 47 47 47 - - 47 47 47 47 47 47 47 47 47 Weekly 7

Mar-17 to

Jan-18

Building N45

Ready Crew Berthing Room 12 37 47 47 47 - - 47 47 47 47 47 47 47 47 47 Weekly 7

Mar-17 to

Jan-18

Building 7 Barracks 4

Room 202 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

Building 7 Barracks 4

Upstairs Drinking Water Fountain 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

Building N45

Ready Crew Berthing Room 4 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

Building N45

Ready Crew Berthing Room 12 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

End of Distribution System 2

Fuel Pier Far 37 57 57 57 12 12 57 57 57 57 57 57 57 12 12 Weekly 7 Mar-17 to

Jan-18

Building 3 Galley

Galley Prep Sink 37 47 47 47 12 12 47 47 47 47 47 47 47 12 12 Weekly 7

Mar-17 to

Jan-18

Wastewater Treatment Plant

Laboratory Sink 37 47 47 47 12 12 47 47 47 47 47 47 47 12 12 Weekly 7

Mar-17 to

Jan-18

Fuel Pier Far 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

Building 3 Galley

Galley Prep Sink 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

Wastewater Treatment Plant

Laborattory Sink 9 9 9 9 - - 9 9 9 9 9 9 9 9 9 Monthly 8 Feb-Oct

Wastewater Treatment Plant

Wastewater Effluent

- 37 37 37 - - 37 37 37 37 37 37 37 - - Weekly 7

Mar-17 to

Jan-18

Wastewater Treatment Plant

Wastewater Effluent

- 9 9 9 - - 9 9 9 9 9 9 9 - - Monthly 8 Feb-Oct

Potable Water Duplicates (weekly) 9 37 59 59 59 - - - - - - - - - - - Weekly 7 Mar-17 to

Jan-18

Potable Water Duplicates (monthly) 9 9 9 9 - - - - - - - - - - - Monthly 8 Feb-Oct

Field MeasurementsLaboratory Analytical Samples

Wastewater Treatment Plant Effluent 3

Residences 2

USCG Page 7 October 2017 lk al in it y

C o p p er

Le ad

Zi n c

E.

C o li

To ta l C o lif o rm

Te m p p H p H m V

O R

P

EC

m

S/ cm

EC

u

S/ cm

D O

Fr ee

C h lr o in e

To ta l C h lo ri n e

Fr eq u en cy

D ra ti n

Coupon Stations

Building N-1

Public Works Garage 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building N-2

Wastewater Treatment Plant 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building 15

AIRSTA Hangar #3 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building N-23

Water Treatment Plant (Laboratory Sink4) 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building N-24

Steam Plant (Janitor Mop Sink5) 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building N-41

Child Development Center 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building N-44

Nemetz Gazebo 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building 559

Buskin Lake Pumphouse 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Building 576

ESD (Kitchenette sink 1st floor6) 18 18 18 18 - - 18 18 18 18 18 18 18 18 18 Monthly 8 18 Months

Coupon Station duplicates (monthly) 18 18 18 18 - - - - - - - - - - - Monthly 8 18 Months

Total Samples 548 696 696 696 36 36 610 610 610 610 610 610 610 449 449

9 - Weekly Potable Water Duplicates collected from one first draw sample during each weekly sampling round. Additional duplicates were collected from second and third draw samples from the first 10 sampling rounds until they were discontinued.

1 - Alkalinity and E.Coli and Total Coliform samples collected from the first draw only. E. Coli and Total Coliform Samples discontinued after 8-2-2017 sampling round on instruction from ADEC.

3 - Wastewater Treatment Plant Effluent collected from dipper into direct discharge 4 - Water Treatment Plant Coupon Stations currently not in place (to be installed by KSS), water sample collected from laboratory sink which runs continually until installed

5 - Steam Plant Coupon Station discharge innaccesible and under steel floor plate, sample collected from janitorial mop sink which is continuously running.

6 - Building 576 Coupon Stations currently not in place (to be installed by KSS), water sample collected from kitchenette sink on first floor until installed

7 - Weekly sampling events in 2017 conducted on: Mar 22 & 29, Apr 5, 12, & 19, May 31, Jun 7, 14, & 21, Jul 12, Aug 2, 9, 16, 23, & 30, Sep 7, 14, 20, & 27, Oct 4, 11, 17, & 25, Nov 1, 8, 15, 22, & 29, Dec 6, 13, 20, & 27. Weekly sampling events in 2018 conducted on: Jan 3, 10, 17, 24, and 31.

8 - Monthly coupon sampling events in 2017 conducted on: Mar 22, Apr 12, May 31, Jul 12, Aug 9, Sep 7, Oct 11, Nov 8, Dec 6; Monthly Samples in 2018 (Potable and Coupons) to be collected during the last week of each month.

Field Measurements

2 - Residences' Samples collected after 6-hours still, First Draw and Second draw (5 minute flush) samples from each. Building 7 Barracks 4 Upstairs Drinking

Water Fountain second sample was collected immediately after first draw. Fuel Pier Far initially had three samples, First Draw, Second Draw (30 second flush), and third draw (5 minute flush). Second and third draw samples discontinued after 7-12-2017 sampling on instruction from ADEC.

Laboratory Analytical Samples

USCG Page 8 October 2017

Appendix A

Sampling Location Map

W O M

E

S

Dev il' s C re ek Lake Louise

B A Y

LAKE

BUSKIN

BUSKIN

RIVER

Lake Catherine (USGS) Genevieve Lake (NAVY)

P

O

N

D

P

O

N

D

N-44 Nemetz Gazebo

N-41 Child Development Center

N-24 - Steam Plant

N2 - Wastewater Treament Plant

N1 - Public Works Garage

576 - ESU/LORSTA Offices

559 - Buskin Lake Pumphouse

15 - AIRSTA Hangar #3

N23 - Water Treatment Plant

BUILDING 3 GALLEY

FUEL PIER

BUILDING 7 BARRACKS 4

BUILDING N45