1081 Canada Avenue Duncan, BC V9L 1V2 P: 250.746.5545 …€¦ · 01/12/2015 · November 30, 2015...

DOSSIE R: 15. 03 43 MADRO NE ENVIRON MENT A L SERVICES LT D.

1081 C anada A venue

Duncan, B C V9L 1V2

P : 2 5 0 . 7 4 6 . 5 5 4 5

F : 2 5 0 . 7 4 6 . 5 8 5 0

www . madrone. ca

i n fo@ madrone. ca

MADRONEenvironm enta l se rvic es ltd.

November 30, 2015

Brian Farquhar

Manager, Parks and Trails Division

Planning and Development Department

Cowichan Valley Regional District

175 Ingram Street, Duncan, BC V9L 1N8

E-mail: [email protected] Madrone File: 15.0343

Dear Brian Farquhar:

Interim Report - Surface water monitoring and analytical test results – Lot A, West of

South Island Aggregates Ltd. soil facility, November 13, 2015 event

Introduction

Madrone Environmental Services Ltd. (Madrone) was retained by the Cowichan Valley Regional

District (CVRD), on November 13, 2015, to inspect and sample offsite surface water discharges

flowing from the South Island Aggregates Ltd. (SIA) contaminated soils treatment facility, located

at 693 Stebbings Road, south of Shawnigan Lake, B.C. The inspection and sampling work was

requested on Crown Land, managed as parkland by the CVRD Parks Department, abutting the

western SIA facility boundary (herein termed ‘the Site’)

This interim report describes Madrone’s observations of the November 13 inspection, and provides

the results of analytical testing conducted on water samples collected by Madrone. A complete

report will be filed, together with results covering a subsequent November 18, 2015 sampling

event, once those results are received from Exova Labs.

Background - Scope of Work

Madrone attended the Site on November 13, 2015, in the midst of a major multi-day rainstorm

event. We understand that the unplanned inspection request was made by the CVRD, further to

public reports of uncontrolled surface water discharges flowing across SIA’s western property

boundary onto Crown Land. Madrone hydrogeologist Thomas Elliot responded to the short-notice

call on a best-efforts basis, using equipment and sampling media available in Madrone’s existing

inventory. Mr. Elliot’s inspection observations are summarized below.

ATTACHMENT B

mailto:[email protected]

COWICHAN VALLEY REGI ONA L DIST RICT PAGE 2

SURFACE WAT ER MONIT O RIN G & ANALYT ICAL T E ST RESULT S NOV. 1 3, 20 15

CVRD PA RKLAND–WEST OF SOUT H ISLAND A GGRE GAT ES LT D. SOIL FAC IL IT Y NOVEMB ER 3 0, 20 15


Site Inspection Observations - November 13, 2015

At, or about, 1:15pm on Friday, the 13th of November 2015, Madrone was contacted by Brian

Duncan, Manager Inspections & Enforcement Division of Cowichan Valley Regional District

(CVRD). A request for overland flow and watercourse sampling on CVRD parkland adjacent to the

SIA site was discussed with Thomas R. Elliot, hydrogeologist. A brief history of the area and

occurrence of overland flow was provided by Mr. Duncan, who also agreed to have Mr. Rob Harris

(Enforcement Officer) guide Mr. Elliot to the Site for the sampling.

Based on Environment Canada’s nearby Shawnigan Lake climate station1, the local area had

received 49.4mm of precipitation in the previous 24 hours. The average daytime temperature was

8.8oC, with a maximum of 13oC occurring around the time of sampling. Skies were overcast to

partially sunny, with clear visibility.

Mr. Elliot arrived on site at the Site at 2:30pm with six sample jars (2x 1L PAH/PCH; 1x 1L PCB

& 3x 250mL total metals & general chemistry). At the time of arrival, three SIA employees were

working to divert the fugitive surface water discharges back onto SIA property.

The area of concern was situated along and immediately west of the western boundary of the SIA

contaminated soil facility, upslope to the south from SIA’s effluent treatment and settling pond, but

downslope from SIA’s contaminated soil encapsulation and disposal area. Overland flow was

observed emerging from the blast-rock floor of the SIA property, and discharging westerly off-

property onto the adjacent CVRD parkland, where it turned and flowed north, downslope to the

natural watercourse into which SIA discharges contents of its effluent treatment pond. The

uncontrolled overland flow observed by Mr. Elliot was clearly bypassing the SIA effluent treatment

system, and was discharging into the natural watercourse at a point below the treatment system.

Mr. Elliot first sampled upslope of the SIA diversion work in progress (station MSW-2; samples 1

& 3). A request was made by Mr. Harris to the SIA employees for a temporary halt to their

diversion work, to minimize sediment in the water samples to be taken by Madrone. The request

was declined. A replicate sample set (station MSW-2; samples 2 & 4) was then taken downslope of

the ongoing diversion work.

Mr. Elliot followed the overland flow downslope to the natural watercourse where it disappeared

into blast-rock set in place over the natural watercourse below the SIA effluent treatment pond.

1

http://climate.weather.gc.ca/climateData/dailydata_e.html?timeframe=2&Prov=BC%20%20

&StationID=97&dlyRange=1911-05-01|2015-11-28&Year=2015&Month=11&Day=29

Accessed November 27th

2015.

http://climate.weather.gc.ca/climateData/dailydata_e.html?timeframe=2&Prov=BC%20%20&StationID=97&dlyRange=1911-05-01|2015-11-28&Year=2015&Month=11&Day=29http://climate.weather.gc.ca/climateData/dailydata_e.html?timeframe=2&Prov=BC%20%20&StationID=97&dlyRange=1911-05-01|2015-11-28&Year=2015&Month=11&Day=29





Mr. Elliot sampled the natural streamwater flow at its emergence point out from the blast-rock

cover (station MSW-1; samples: 5 & 6).

All water samples were placed into a cooler equipped with ice packs, and driven to a courier pickup

point where sample custody was relinquished at 4:00pm of November, Friday 13th 2015. The

samples were received by EXOVA Labs of Surrey, B.C. on the following day, Saturday 14th 2015,

and were processed for analytical testing.

Interim Summary of Surface Water Sampling Lab Results

Surface water samples taken on November 13th 2015 were analyzed for general water chemistry,

hydrocarbons (PHC/PAHs), trace metals and PCBs. Parameters selected for analyses were partially

based on guidance from SIA’s facility permit PR105809, and on available sampling media at the

time of CVRD request.

Two surface water locations were sampled: one discretely within the receiving natural watercourse

(MSW-1) downstream from the SIA property; and one as a representative composite of the off-

property overland discharge flowing off the SIA property (MSW-2). Samples collected had sufficient

volume and sample-replication to provide results that can be validly compared to applicable

standards and guidelines provided by the B.C. Contaminated Site Regulations (BC CSR – Schedule

6), B.C. Approved Water Quality Guidelines (BCWWQG), as well as federal guidelines 2.

A summary of November 13 analytical results follows hereafter:

general chemistry of water presented normal values associated with rainwater, with neutral pH and semi-trace metal content;

hardness (indicated by CaCO3) was high in all samples, being considered Hard to Very

Hard3. The MSW-1 sample was 1.5x harder than the MSW-2 sample site.

concentrations of extractable petroleum hydrocarbons (EPH) were generally below method detection thresholds except;

heavy extractable petroleum hydrocarbons (EPHw19-32 and HEPHw, respectively) were

detected in the clear-running overland flow sample of MSW-2, but well below the

applicable BC CSR standards and BCWWQG;

2 Canadian Water Quality Guidelines,

www.ccme.ca/files/Resources/supporting_scientific.../cwqg_pn_1040.pdf accessed Nov 27

2015.

3 Hardness in groundwater. BC Ministry of Environment

www.env.gov.bc.ca/wsd/.../groundwater/.../hardness(020715)_fin2.pdf accessed Nov 27 2015.

http://www.ccme.ca/files/Resources/supporting_scientific.../cwqg_pn_1040.pdfhttp://www.env.gov.bc.ca/wsd/.../groundwater/.../hardness(020715)_fin2.pdf





trace metals (total) analyses for aluminum, copper and selenium yielded exceedances of BC CSR standards and the BCWWQG guidelines;

total aluminum concentrations (29,500 & 114,000 µg/L) exceeded human and aquatic

health levels in the overland flow samples obtained from station MSW-2. We note that;

· reported aluminum levels in B.C. fresh waters generally range from 6 –

9300 µg/L for similar pH levels;

· total aluminum obtained from the natural watercourse (MSW-1) was

elevated at 1060 µg/L, but did not exceed B.C. standards or guidelines;

total copper nominally exceeded BC CSR Aquatic Life freshwater standard in overland flow

MSW-2 samples;

· reported copper levels in BC fresh waters range from 1 – 80 µg/L for

similar regional surface waters.

Selenium exceeded the BCWWQG.

· Reported selenium levels in BC fresh waters range from 0.1 – 0.2 µg/L for

similar regional surface waters.

Polychlorinated biphenyls (PCBs) were undetectable within all samples analyzed.

Limitations of Investigations

An environmental site investigation can reduce, but not wholly eliminate, uncertainty regarding the

potential for contamination at a site, given reasonable limits of time and cost. Madrone

Environmental Services Ltd. (Madrone) has conducted this investigation and prepared this report in

a manner consistent with the level of care normally exercised by environmental professionals

currently practicing in the area under similar conditions and budgetary constraints. No other

warranties, either expressed or implied, are made. If unexpected environmental conditions are

encountered on the Site, Madrone must be notified in order that we may determine if modifications

to our findings are necessary.

The findings of this investigation and report are based in part on information provided to Madrone

by the client and other individuals or organizations, as referenced in this report. While Madrone

believes that this information was provided in good faith and has attempted to verify the

information where practical, Madrone does not accept any responsibility for any inaccuracies,

deficiencies, or omissions contained in this report, based on the use of this information.



CVRD PA RKLAND–WEST OF SOUT H ISLAND A GGRE GAT ES LT D. SOIL FAC IL IT Y NOVEMB ER 30, 20 15


The findings of this investigation and report are based in part on Madrone’s visual observations of

environmental site conditions. Our opinion cannot be extended to portions of the site that were

unavailable for direct observations due to circumstances reasonably beyond Madrone’s control.

We have made reasonable efforts to collect samples, if and where completed, which are

representative of conditions in the relevant portions of the Site; however, conditions may vary from

place to place and with time. Sample information and analytical chemical results pertain specifically

to the points and dates of sampling. Madrone investigated environmental conditions on the Site

only with respect to environmental regulations currently in effect within the applicable jurisdiction.

Madrone has prepared this report for the exclusive use of the Cowichan Valley Regional District.

Any third party use of this report, or reliance placed on it, or decisions taken based on it, is the

responsibility of such third parties. Madrone accepts no responsibility for any damages suffered by

any other such third party, or any claims made by any other such third party as a result of decisions

made or actions taken, based on this report.

Closure

We trust that this report meets your present requirements. Should you wish to discuss this further

please call the undersigned at (250) 746-5545.

Yours truly,

MADRONE ENVIRONMENTAL SERVICES LTD.

Prepared by: Reviewed by:

*This is a digitally signed duplicate of the official manually signed and sealed document.

Thomas Elliot, Ph.D, A.Ag, GIT Jim Richard, HBES, P.Ag

Hydrogeologist Senior Scientist

Attachments: Figure 1. General Location Plan

Figure 2. Site Sampling Plan

Tables

Exova Lab Report – Lot

Highway

1Shawnigan Lake Road

Stebbings Road

Shawnigan Lake

FinlaysonArm

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

FIGURE 1: General Location Plan

Pr oje ct Loc at i on

_̂

0 500 1,000 1,500mSca le 1: 30 0 00

Surface Water Monitoring - 693 Stebbings RoadSAMPLED BY: LOCATION:CVRD Parkland offsite of South Island Aggregates Ltd.

CLIENT:Cowichan Valley Regional District

DOSSIER NO:15.0343DRAWN BY:Johnathan Mack

PROJECT:

Thomas Elliot PhD, G.I.T., A.Ag., (Nov,13, 2015) µNovember 30, 2015MAPPING DATE:

Project:

Surface Water Monitoring – 693 Stebbings Road

Mapping Date:

November 30, 2015

Client:


Dossier No:

15.0343

Sampled By:

Thomas Elliot PhD, G.I.T., A.Ag.,

Sampling Date:

November 13, 2015

Location:

CVRD parkland offsite of South Island Aggregates Ltd. Soil Facility

Drawn By:

Jared Fath

Figure 2: Surface Water Sampling Plan

SIA Stebbings Road Soil Facility

CVRD Parkland

MSW-1 Nov 13 Samples #5&6



50m


Surface Water Monitoring - Analytical Test Results

CVRD Parkland - Offsite West of South Island Aggregates Ltd Soil Facility

November 30 2015

November 13 2015 Sampling Table 1. Petroleum Hydrocarbons in Surface Water

Sample Station >>>

Lab Lot Reference >>> 1106623-5 1106623-6 1106623-1 1106623-2 1106623-3 1106623-4

Madrone Sample I.D.>>> Sample 5 Sample 6 Sample 1 Sample 2 Sample 3 Sample 4 Aquatic Life Drinking Freshwater

Sampled Date >>> 2015\11\13 2015\11\13 2015\11\13 2015\11\13 2015\11\13 2015\11\13 (freshwater) Water Aquatic Life

PARAMETER

Monocyclic Aromatic

Hydrocarbons

Benzene ug/L - - - - - - 4000 5 40 *

Ethylbenzene ug/L - - - - - - 2000 2.4 200 *

Toluene ug/L - - - - - - 390 24 0.5

Xylenes (total) ug/L - - - - - - n.s. 300 30

Styrene - - - - - - 720 n.s. n.s.

Volatile Petroleum

Hydrocarbons - - - - - -

VHw6-10 ug/L - - - - - - 15000 15000 n.s.

VPHw ug/L - - - - - - 1500 1500 n.s.

Styrene ug/L - - - - - - n.s. n.s. n.s.

MTBE ug/L - - - - - - 34000 15 3400

Extractable Petroleum

Hydrocarbons

EPHw10-19 100 ug/L



CVRD Parkland - Offsite West of South Island Aggregates Ltd. Soil Facility

November 30 2015

November 13 2015 Sampling

Table 2. Polycyclic Aromatic Hydrocarbons in Surface Water

Sample Station >>>


Madrone Sample I.D.>>> Sample 5 Sample 6 Sample 1 Sample 2 Sample 3 Sample 4 Aquatic Life Aquatic Life Freshwater


PARAMETER

Polycyclic Aromatic

Hydrocarbons

Acenaphthene 0.1 ug/L




November 30 2015


Table 3. Routine Parameters & Semi-Trace Metals in Surface Water

Sample Station >>>




PARAMETER

Routine Water

Hardness mg CaCO3/L 1 - 285 - 1450 191 144 n.s. n.s. n.s.

pH - - - 7.55 - - n.s. n.s. n.s.

Elec. Conductivity dS/m at 25c - - - 0.425 - - n.s. n.s. n.s.

Semi-Trace Metals (Total)

Calcium mg/L 0.05 - 95.7 - - 49.5 40.9 n.s. n.s. n.s.

Iron mg/L 0.01 - 0.833 - - 73.2 31.6 n.s. 6500 ug/L * 1ST

Magnesium mg/L 0.05 - 11.3 - - 16.4 10.1 n.s. 100 mg/L n.s.

Manganese mg/L 0.005 - 0.0456 - - 2.66 0.751 n.s. 550 ug/L *

Potassium mg/L 0.1 - 3.17 - - 4.7 3.2 n.s. n.s. n.s.

Silicon mg/L 0.05 - 30.9 - - 84.4 58.8 n.s. n.s. n.s.

Sulfur mg/L 0.1 - 37 - - 42.5 52.4 n.s. n.s. n.s.

Sodium mg/L 0.02 - 66.5 - - 29.1 32.2 n.s. 200 mg/L n.s.

Titanium mg/L 0.001 - 0.0404 - - 5.54 3.19 1000 n.s. n.s.

Mercury ug/L 0.01 -




November 30 2015

November 13 2015 Sampling Table 4. Trace Metals (Total) in Surface Water

Sample Station >>>

Lab Lot Reference >>> 1106623-5 1106623-6 1106623-1 1106623-2 1106623-3 1106623-4 BCWWQG2



PARAMETER

Hardness mg CaCO3/L 1 - 285 191 144

pH - - - 7.55 - -

Trace Metals (Total)Aluminum ug/L 5 - 1060 - - 114000 29500 n.s 9500 5000Antimony ug/L 0.2 -




November 30 2015


Table 5. Polychlorinated Biphenyls in Surface Water

Sample Station >>>




PARAMETER

Polychlorinated Biphenyls

Aroclor 1016 ug/L 0.1 - - -

Report Transmission Cover Page

Exova#104, 19575-55 A Ave.Surrey, British ColumbiaV3S 8P8, Canada

(604) 514-3322(604) 514-3323

[email protected]:W: www.exova.com

T: +1F: +1

Bill To: Madrone Environmental Services

Report To: Madrone Environmental Services

1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot

Sampled By: Thomas Elliot

Madrone Env.Company:

Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Contact & Affiliation Address Delivery Commitments

Madrone Environmental Services

Phone: (250) 746-5545

Fax: (250) 746-5850Email: [email protected]

(COA) by Email - Single Report

On [Lot Verification] send

(COC, Test Report) by Email - Merge Reports

On [Report Approval] send

(Invoice) by Email - Single Report

On [Lot Approval and Final Test Report Approval] send

(COR) by Email - Single Report

On [Lot Creation] send

1081 Canada Avenue

Duncan, British Columbia V9L 1V2

Thomas Elliot

Madrone Environmental Services

Phone: (250) 746-5545

Fax: (250) 746-5850Email: [email protected]

(Test Report, COC) by Email - Merge Reports

On [Report Approval] send1081 Canada Avenue

Duncan, British Columbia V9L 1V2

Jim Richard

Notes To Clients:

An appropriately preserved sample was not received for Total Mercury analysis of samples 1106623-3,4,6. Analysis was performed on samplepreserved with Nitric Acid.

•

pH analysis was performed past the recommended holding time of 15 minutes from sample collection.•Unable to report pH from the W39BC package as samples were preserved for total metals upon receipt at the Lab.•

The information contained on this and all other pages transmitted, is intended for the addressee only and is considered confidential.If the reader is not the intended recipient, you are hereby notified that any use, dissemination, distribution or copy of this transmission is strictly prohibited.

If you receive this transmission by error, or if this transmission is not satisfactory, please notify us by telephone.

www.exova.com/about/terms-and-conditionsTerms and Conditions:

Analytical Report


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Reference Number 1106623-1 1106623-5

Sample Date Nov 13, 2015 Nov 13, 2015

Sample Time 15:00 15:00

Sample Location

Sample Description Sample 1 SIA Runoff Sample 5 SIA Runoff

Matrix Water Water

Analyte Units Results Results Results Nominal DetectionLimitExtractable Petroleum Hydrocarbons - Water

EPHw10-19 ug/L

Analytical Report


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Reference Number 1106623-2

Sample Date Nov 13, 2015

Sample Time 15:00

Sample Location

Sample Description Sample 2 SIA Runoff

Matrix Water

Analyte Units Results Results Results Nominal DetectionLimitPolychlorinated Biphenyls - Water

Aroclor 1016 ug/L

Analytical Report


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Reference Number 1106623-3 1106623-4 1106623-6

Sample Date Nov 13, 2015 Nov 13, 2015 Nov 13, 2015

Sample Time 15:00 15:00 15:00

Sample Location

Sample Description Sample 3 SIA Runoff Sample 4 SIA Runoff Sample 6 SIA Runoff

Matrix Water Water Water

Analyte Units Results Results Results Nominal DetectionLimitMetals Total

Calcium Total mg/L 49.5 40 95.9 .7 0.05

Iron Total mg/L 73.2 31 0.6 .833 0.01

Magnesium Total mg/L 16.4 10 11.1 .3 0.05

Manganese Total mg/L 2.66 0 0.751 .0456 0.005

Potassium Total mg/L 4.70 3 3.20 .17 0.1

Silicon Total mg/L 84.4 58 30.8 .9 0.05

Sulfur Total mg/L 42.5 52 37.4 .0 0.1

Sodium Total mg/L 29.1 32 66.2 .5 0.02

Titanium Total mg/L 5.54 3 0.19 .0404 0.001

Mercury Total ug/L 0.042 0

Analytical Report


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Reference Number 1106623-3 1106623-4 1106623-6

Sample Date Nov 13, 2015 Nov 13, 2015 Nov 13, 2015

Sample Time 15:00 15:00 15:00

Sample Location

Sample Description Sample 3 SIA Runoff Sample 4 SIA Runoff Sample 6 SIA Runoff

Matrix Water Water Water

Analyte Units Results Results Results Nominal DetectionLimitTrace Metals Total - Continued

Zinc Total ug/L 130 57 3 1

Zirconium Total ug/L 12 4 0.2 0.1

Mercury Total ug/L 0.042 0

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Metals TotalBlanks Units Measured Lower Limit Upper Limit Passed QC

mg/LCalcium -0.10 0.100.00217989 yes

mg/LIron -0.009 0.0090.000693992 yes

mg/LMagnesium -0.10 0.100.00390571 yes

mg/LManganese -0.0010 0.00104.73793e-005 yes

mg/LPotassium -0.10 0.100.0122761 yes

mg/LSilicon -0.05 0.05-0.00403385 yes

mg/LSodium -0.02 0.02-0.00172304 yes

Date Acquired: November 17, 2015

ng/LMercury -9.990 9.9900 yes


Upper LimitCalibration Check Units % Recovery Passed QCLower Limit

mg/LCalcium 99.82 yes90 110

mg/LIron 100.76 yes90 110

mg/LMagnesium 101.33 yes90 110

mg/LManganese 100.27 yes90 110

mg/LPotassium 100.35 yes90 110

mg/LSilicon 102.81 yes90 110

mg/LSodium 100.75 yes90 110

mg/LTitanium 100.46 yes90 110


mg/LCalcium 98.42 yes90 110

mg/LIron 99.38 yes90 110

mg/LMagnesium 102.60 yes90 110

mg/LManganese 100.37 yes90 110

mg/LPotassium 97.45 yes90 110

mg/LSilicon 102.34 yes90 110

mg/LSodium 97.30 yes90 110

mg/LTitanium 98.04 yes90 110


Units Passed QCClient Sample Replicates Replicate 1 Replicate 2 % RSD Criteria Absolute Criteria

mg/LCalcium 502 20 0.05503 yes

mg/LIron 0.062 20 0.050

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Routine WaterUnits Passed QCClient Sample Replicates Replicate 1 Replicate 2 % RSD Criteria Absolute Criteria

mg CaCO3/LHardness 1450 20 1.0001450 yes


pH 7.58 107.55 yes

dS/m at 25 CElectrical Conductivity 0.427 10 0.0050.425 yes


Control Sample Units Measured Lower Limit Upper Limit Passed QC

pH 10.8110.1 yes9.17

µS/cm at 25 CElectrical Conductivity 243216 yes165


pH 4.124.00 yes3.88


pH 8.127.89 yes7.88


µS/cm at 25 CElectrical Conductivity 15031430 yes1323


Extractable Petroleum Hydrocarbons -Water

Blanks Units Measured Lower Limit Upper Limit Passed QC

ug/mLEPHw10-19 -100 1000 yes

ug/mLEPHw19-32 -100 1000 yes



ug/mLEPHw10-19 94.20 yes85 115

ug/mLEPHw19-32 96.76 yes85 115


Units Passed QCReplicates Replicate 1 Replicate 2 % RSD Criteria Absolute Criteria

EPHw10-19 ug/L 1540 1720 40 500 yes

EPHw19-32 ug/L 1710 1870 40 500 yes


Matrix Spike Units Lower Limit Upper Limit Passed QC% Recovery

EPHw10-19 ug/L 94 128 yes79

EPHw19-32 ug/L 91 122 yes70


Polycyclic Aromatic Hydrocarbons -Water


ng/mLAcenaphthene -0.1 0.10 yes

ng/mLAcenaphthylene -0.1 0.10 yes


Page 6 of 13

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Polycyclic Aromatic Hydrocarbons -Water - Continued


ng/mLAcridine -0.05 0.050 yes

ng/mLAnthracene -0.1 0.10 yes

ng/mLBenzo(a)anthracene -0.01 0.010 yes

ng/mLBenzo(a)pyrene -0.01 0.010 yes

ng/mLBenzo(b)fluoranthene -0.01 0.010 yes

ng/mLBenzo(g,h,i)perylene -0.1 0.10 yes

ng/mLBenzo(k)fluoranthene -0.02 0.020 yes

ng/mLChrysene -0.1 0.10 yes

ng/mLDibenzo(a,h)anthracene -0.01 0.010 yes

ng/mLFluoranthene -0.1 0.10 yes

ng/mLFluorene -0.1 0.10 yes

ng/mLIndeno(1,2,3-c,d)pyrene -0.1 0.10 yes

ng/mLNaphthalene -0.1 0.10 yes

ng/mLPhenanthrene -0.1 0.10 yes

ng/mLPyrene -0.02 0.020 yes

ng/mLQuinoline -0.34 0.340 yes



ng/mLAcenaphthene 100.24 yes80 120

ng/mLAcenaphthylene 103.98 yes80 120

ng/mLAcridine 104.93 yes80 120

ng/mLAnthracene 104.01 yes80 120

ng/mLBenzo(a)anthracene 102.95 yes80 120

ng/mLBenzo(a)pyrene 101.62 yes80 120

ng/mLBenzo(b)fluoranthene 105.13 yes80 120

ng/mLBenzo(g,h,i)perylene 89.35 yes80 120

ng/mLBenzo(k)fluoranthene 99.67 yes80 120

ng/mLChrysene 100.16 yes80 120

ng/mLDibenzo(a,h)anthracene 95.32 yes80 120

ng/mLFluoranthene 104.17 yes80 120

ng/mLFluorene 103.28 yes80 120

ng/mLIndeno(1,2,3-c,d)pyrene 91.44 yes80 120

ng/mLNaphthalene 100.09 yes80 120

ng/mLPhenanthrene 96.53 yes80 120

ng/mLPyrene 104.32 yes80 120

ng/mLQuinoline 103.83 yes80 120



Acenaphthene ug/L 0.1 0.1 20 0.5 yes

Acenaphthylene ug/L 0.1

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Polycyclic Aromatic Hydrocarbons -Water - Continued


Anthracene ug/L

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

PAH - Water - Surrogate Recovery -Continued


%Naphthalene-d8 95.64 yes80 120



2-Fluorobiphenyl % 111 97 20 0 yes

p-Terphenyl-d14 % 110 104 20 0 yes

Naphthalene-d8 % 111 113 20 0 yes


Control Sample Units Measured Lower Limit Upper Limit Passed QC

%2-Fluorobiphenyl 130111 yes50

%p-Terphenyl-d14 130110 yes60

%Naphthalene-d8 130111 yes50


Polychlorinated Biphenyls - WaterBlanks Units Measured Lower Limit Upper Limit Passed QC

ug/mLAroclor 1016 -0.3 0.30 yes











ug/mLAroclor 1260 105.00 yes80 120


Polychlorinated Biphenyls - Water -Surrogate


%Decachlorobiphenyl 50 15084.4697 yes


Trace Metals TotalBlanks Units Measured Lower Limit Upper Limit Passed QC

ug/LAluminum -5 50.969594 yes

ug/LAntimony -0.2 0.20.0924988 yes

ug/LArsenic -0.2 0.20.00228318 yes


Page 9 of 13

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Trace Metals Total - ContinuedBlanks Units Measured Lower Limit Upper Limit Passed QC

ug/LBarium -1.0 1.00.00930864 yes

ug/LBeryllium -0.04 0.040.00595646 yes

ug/LBismuth -1.0 1.00.0163924 yes

ug/LBoron -5 50.507421 yes

ug/LCadmium -0.01 0.010.00330188 yes

ug/LChromium -0.4 0.40.0735234 yes

ug/LCobalt -0.02010 0.020100.00775805 yes

ug/LCopper -0.990 0.9900.00437679 yes

ug/LLead -0.099 0.0990.0066441 yes

ug/LLithium -1 1-0.0246707 yes

ug/LMolybdenum -0.20 0.200.0395719 yes

ug/LNickel -1 10.0195716 yes

ug/LSelenium -0.6 0.6-0.00257094 yes

ug/LSilver -0.01 0.010.00729421 yes

ug/LStrontium -1.0 1.00.0150667 yes

ug/LTellurium -0.1 0.10.0033966 yes

ug/LThallium -0.01 0.010.00774853 yes

ug/LThorium -0.40 0.400.198408 yes

ug/LTin -0.1 0.10.0550239 yes

ug/LTitanium -0.4 0.40.0842619 yes

ug/LUranium -0.4 0.40.0163848 yes

ug/LVanadium -0.10 0.100.010068 yes

ug/LZinc -1 10.0410885 yes

ug/LZirconium -0.1 0.10.0648675 yes


ng/LMercury -9.990 9.9902.8 yes



ng/LMercury 96.60 yes90 110


ug/LAluminum 102.25 yes80 120

ug/LAntimony 102.53 yes90 110

ug/LArsenic 93.95 yes90 110

ug/LBarium 99.87 yes90 110

ug/LBeryllium 98.92 yes90 110

ug/LBoron 84.17 yes70 130

ug/LCadmium 97.65 yes90 110

ug/LChromium 99.54 yes90 110

ug/LCobalt 95.16 yes90 110

ug/LCopper 99.80 yes90 110

ug/LLead 101.70 yes90 110


Page 10 of 13

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Trace Metals Total - ContinuedUpper LimitCalibration Check Units % Recovery Passed QCLower Limit

ug/LLithium 95.82 yes90 110

ug/LMolybdenum 94.47 yes90 110

ug/LNickel 97.32 yes90 110

ug/LSelenium 101.22 yes90 110

ug/LSilver 102.58 yes90 110

ug/LStrontium 91.90 yes90 110

ug/LThallium 105.25 yes90 110

ug/LThorium 104.09 yes90 110

ug/LTin 95.13 yes90 110

ug/LTitanium 99.42 yes90 110

ug/LUranium 103.15 yes90 110

ug/LVanadium 94.16 yes90 110

ug/LZinc 99.16 yes90 110


ug/LAluminum 95.98 yes80 120

ug/LAntimony 98.55 yes90 110

ug/LArsenic 94.03 yes90 110

ug/LBarium 95.09 yes90 110

ug/LBeryllium 99.70 yes90 110

ug/LBoron 97.22 yes80 120

ug/LCadmium 100.49 yes90 110

ug/LChromium 101.31 yes90 110

ug/LCobalt 93.77 yes90 110

ug/LCopper 98.66 yes90 110

ug/LLead 100.20 yes90 110

ug/LLithium 97.38 yes90 110

ug/LMolybdenum 94.74 yes90 110

ug/LNickel 96.34 yes90 110

ug/LSelenium 102.91 yes90 110

ug/LSilver 101.00 yes90 110

ug/LStrontium 94.45 yes90 110

ug/LThallium 100.22 yes90 110

ug/LThorium 101.41 yes90 110

ug/LTin 96.01 yes90 110

ug/LTitanium 103.39 yes90 110

ug/LUranium 101.62 yes90 110

ug/LVanadium 94.30 yes90 110

ug/LZinc 97.31 yes90 110


Certified Reference Material Units Measured Target Lower Limit Upper Limit Passed QC

ug/LMercury 0.0730.097 0.1210.101 yes



Page 11 of 13

Quality Control


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Trace Metals Total - Continued


Page 12 of 13

Methodology and Notes


(604) 514-3322(604) 514-3323


T: +1F: +1



1081 Canada Avenue

Duncan, BC, Canada

V9L 1V2

Attn: Thomas Elliot



Project:

ID:

Name:

Location:

LSD:

P.O.:

Acct code:

15.0343

Shawnigan

Lot ID:

Control Number:

Date Received:

Date Reported:

Report Number:

1106623

Nov 14, 2015

Nov 24, 2015

2061648

Method of AnalysisMethod Name Reference Method Date Analysis

StartedLocation

EPH - Water BCELM 17-Nov-15 Exova Surrey* Extractable Petroleum Hydrocarbons(EPH) in Water by GC/FID, EPH Water

Mercury Low Level (Total) in water(Surrey)

EPA 16-Nov-15 Exova Surrey* Mercury in Water by Cold Vapor AtomicFluorescence Spectrometry, 245.7

Metals SemiTrace (Total) in Water(Surrey)

US EPA 17-Nov-15 Exova Surrey* Metals & Trace Elements by ICP-AES,6010C

PAH - Water (Surrey) BCELM 17-Nov-15 Exova Surrey* Polycyclic Aromatic Hydrocarbons inWater by GC/MS - PBM, PAH Water

PCB - Water US EPA 17-Nov-15 Exova Calgary* Polychlorinated Biphenyls (PCBs) by GasChromatography, 8082A

Trace Metals (Total) in Water (Surrey) US EPA 17-Nov-15 Exova Surrey* Determination of Trace Elements inWaters and Wastes by ICP-MS, 200.8

* Reference Method Modified

ReferencesB.C.M.O.E B.C. Ministry of Environment

BCELM B.C. Environmental Laboratory Manual

EPA Environmental Protection Agency Test Methods - US

US EPA US Environmental Protection Agency Test Methods

Comments:An appropriately preserved sample was not received for Total Mercury analysis of samples 1106623-3,4,6. Analysis was performed on samplepreserved with Nitric Acid.

•

pH analysis was performed past the recommended holding time of 15 minutes from sample collection.•

Please direct any inquiries regarding this report to our Client Services group.Results relate only to samples as submitted.

The test report shall not be reproduced except in full, without the written approval of the laboratory.www.exova.com/about/terms-and-conditionsTerms and Conditions:

Page 13 of 13

Exova T: +1 (604) 514-3322

#104, 19575 - 55A Avenue F: +1 (604) 514-3323

Surrey, B.C. E: [email protected]

V3S-8P8, Canada W: www.exova.com

Hydrocarbon Chromatogram

Bill To: Madrone Environmental Services Ltd Project ID: 15.0343 Lot ID: 1106623Report To: Madrone Environmental Services Ltd Name: Shawnigan Control Number:

Location: Date Received: Nov 14, 20151081 Canada Avenue LSD: Date Reported: Nov 24, 2015Duncan, BC, Canada P.O.: Report Number: 2061648V9L 1V2

Attn: Thomas ElliotSampled by: Thomas Elliot

Company: Madrone Env.

Exova Number: 1106623-1 Sample Description: Sample 1 SIA Runoff Sample Date: Nov 13, 2015

Gasoline C4-C12 Kerosene C7-C16 Lubricating Oils C20-C40Varsol C8-C12 Diesel C8-C22 Crude Oils C3-C60+

Terms and conditions: www.exova.ca/terms&conditions.html

Product Carbon Number Ranges

Motor Oil (SAE 5W30)TYPICAL PRODUCT CHROMATOGRAMS

Unweathered CrudeWinter Diesel

min2.5 5 7.5 10 12.5 15 17.5

pA

0

100

200

300

400

500

FID2 B, Back Signal (Z:\EXTRACTABLES GROUP\CCME DATA STORAGE\13-14\DATA\121212TM\056B0301.D)

CARBON NUMBER

C10

- . -

C12

. . . -

C16

. . . -

C20

. . . -

C24

. . . -

C28

. . . -

C32

. . . -

C36

. . . -

C40

. . . -

C44

. . . -

C48

. . . -

C52

. . . -

C56

. . . -

C60

0 300

2.2e5

Sig. 1 in C:\H

PCH

EM

\...\016F0401.D

Time (min.)

CARBON NUMBER

| . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . .. | . ..| ...| ...|12 16 20 24 28 32 36 40 44 48 52 56 60

0 3 00

1 .6 e5

Sig. 1 in C

:\HPCHEM\...\012F

0401.D

T ime (min . )

CARBON NUM BER

| . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . .. | . .. | ...| ...|1 2 1 6 2 0 2 4 2 8 3 2 3 6 4 0 4 4 4 85 25 66 0

min2 4 6 8 10 12

pA

0

50

100

150

200

250

300

350

400

FID1 A, (151117\FID000020.D)

CARBON NUMBER

C10

- . -

C12

. . . -

C16

. . . -

C20. . . -

C24

. . . -

C28

. . . -

C32

. . . -

C36

. . . -

C40

Exova T: +1 (604) 514-3322

#104, 19575 - 55A Avenue F: +1 (604) 514-3323

Surrey, B.C. E: [email protected]

V3S-8P8, Canada W: www.exova.com

Hydrocarbon Chromatogram

Bill To: Madrone Environmental Services Ltd Project ID: 15.0343 Lot ID: 1106623Report To: Madrone Environmental Services Ltd Name: Shawnigan Control Number:

Location: Date Received: Nov 14, 20151081 Canada Avenue LSD: Date Reported: Nov 24, 2015Duncan, BC, Canada P.O.: Report Number: 2061648V9L 1V2

Attn: Thomas ElliotSampled by: Thomas Elliot

Company: Madrone Env.

Exova Number: 1106623-5 Sample Description: Sample 5 SIA Runoff Sample Date: Nov 13, 2015

Gasoline C4-C12 Kerosene C7-C16 Lubricating Oils C20-C40Varsol C8-C12 Diesel C8-C22 Crude Oils C3-C60+

Terms and conditions: www.exova.ca/terms&conditions.html

Product Carbon Number Ranges

Motor Oil (SAE 5W30)TYPICAL PRODUCT CHROMATOGRAMS

Unweathered CrudeWinter Diesel

min2.5 5 7.5 10 12.5 15 17.5

pA

0

100

200

300

400

500

FID2 B, Back Signal (Z:\EXTRACTABLES GROUP\CCME DATA STORAGE\13-14\DATA\121212TM\056B0301.D)

CARBON NUMBER

C10

- . -

C12

. . . -

C16

. . . -

C20

. . . -

C24

. . . -

C28

. . . -

C32

. . . -

C36

. . . -

C40

. . . -

C44

. . . -

C48

. . . -

C52

. . . -

C56

. . . -

C60

0 300

2.2e5

Sig. 1 in C:\H

PCH

EM

\...\016F0401.D

Time (min.)

CARBON NUMBER

| . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . .. | . ..| ...| ...|12 16 20 24 28 32 36 40 44 48 52 56 60

0 3 00

1 .6 e5

Sig. 1 in C

:\HPCHEM\...\012F

0401.D

T ime (min . )

CARBON NUM BER

| . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . .. | . .. | ...| ...|1 2 1 6 2 0 2 4 2 8 3 2 3 6 4 0 4 4 4 85 25 66 0

min2 4 6 8 10 12

pA

0

50

100

150

200

FID1 A, (151117\FID000021.D)

CARBON NUMBER

C10

- . -

C12

. . . -

C16

. . . -

C20. . . -

C24

. . . -

C28

. . . -

C32

. . . -

C36

. . . -

C40

December 1, 2015 File: 10368

Cowichan Valley Regional District 175 Ingram Street Duncan, BC V9L 1N8

Attention: Brian Farquhar, Manager Parks and Trails

STORM WATER MANAGEMENT OBSERVATIONS SOUTH ISLAND AGGREGATE, 640 STEBBINGS ROAD

Dear Mr. Farquhar:

Thurber Engineering Ltd. (Thurber) conducted a visual site assessment of part of the Water Management System (WMS) at South Island Aggregates (SIA) landfill including the sediment control pond infrastructure, ephemeral stream and nearby southwestern property boundary. The inspection was conducted from land owned by the Cowichan Valley Regional District (CVRD) following your verbal request of November 18th, 2015.

It is a condition of this proposal that Thurber’s performance of its professional services is subject to the attached Statement of Limitations and Conditions.

1. BACKGROUND

The South Island Aggregate facility operates under BC Ministry of Environment (BC MoE) permit PR-105809, which we understand, requires that all surface water (contact and non-contact water) be contained on the property and treated in accordance with the permit requirements (Ref. 4). SIA’s WMS is described within an as-built summary report produced by Active Earth Engineering Ltd. on December 6, 2013 (Ref. 2). For reference, a copy of the Figure 1 drawing from that report titled “Water Management System (As Built)” is appended following the text of this report.

The system includes a lined containment reservoir which receives water from the soil management area, storm water pipes which move the water to a water treatment plant, storm water diversion ditches and a sediment pond which is designed to receive treated and surface waters for discharge to a small ephemeral stream located to the west of the western property boundary. The ephemeral stream is part of the Shawnigan Lake Watershed and located on property owned by the CVRD. We are not aware if the ephemeral stream was a natural feature prior to the establishment of the rock quarry at the SIA site, or what its drainage characteristics may have been.

The Environmental Protection Division of the BC MoE conducted a compliance inspection at the SIA site on November 14th, 2015 and issued an inspection report and compliance letter to Cobble Hill Holdings (the permit holder) on November 18th, 2015 (Ref. 4). The letter notes two issues of non-compliance related to the uncontrolled discharge of storm water to CVRD land.

100, 4396 West Saanich Road, Victoria, BC V8Z 3E9 T: 250 727 2201 F: 250 727 3710 thurber.ca

ATTACHMENT A

Client: Cowichan Valley Regional District Date: December 1, 2015 File No.: 10368 Page 2 of 6 E-File: pjw_10368_ltr_Preliminary SIA Stormwater Observations.docx

We understand that Madrone Environmental Services Ltd. was on site on November 14 and 18th, 2015 to collect water samples from the ephemeral stream for submission to an environmental laboratory for analysis of potential contaminants of concern. We are not aware of the results of the environmental analysis conducted.

The occurrence of recent heavy rains has raised concerns regarding the effectiveness of the WMS at the SIA site. Rainfall amounts recorded at Shawnigan Lake (~7 km north of the SIA site) included over 50 mm of rain on November 12th to 14th and over 30 mm of rain on November 16th and 17th, 2015 as shown on the graph below.

Total Rainfall at Shawnigan Lake Weather Station

Source: http://www.victoriaweather.ca

2. METHODOLOGY

The site visit was conducted by Paul Wilson, M.Sc., P.Geo. of Thurber in the company of Nino Morano (CVRD Bylaw Enforcement Officer) on November 19th, 2015. The weather at the time of the site visit was clear and sunny.

Visual observations were made and photographs were taken of the site and WMS infrastructure from CVRD land by traversing along the western property boundary to just north of the ephemeral stream. The SIA property was not accessed at this time. A selection of site photographs taken on November 19th, 2015 have been included following Figure 1 at the end of the text of this report.

A listing of references cited as part of this assessment are included in Section 6.


3. OBSERVATIONS

Recent repairs had been made to the western end of a diversion ditch which had recently discharged storm water onto CVRD land in the vicinity of (A) as shown on the attached Figure 1 drawing and in Photos 1 and 2. It appeared that a small diversion trench had recently been excavated across a soil berm which redirected the westward flowing runoff away from the property line towards the active area of the landfill (Photo 11). Silt fencing had also been placed along the property boundary fence. No surface water was observed to be crossing the property boundary at (A) at the time of the site visit.

A little farther to the north along the property boundary from (A), a northward flowing swale had recently been excavated on SIA property. The swale was armoured with coarse blast rock (Photo 3). Surface water could be heard flowing within the swale under the armour. The swale terminated within the southern end of the sediment pond (Photo 4) where a small amount of water was observed to be flowing into the empty sediment pond basin. The swale appears to be intercepting westward flowing surface water and possibly shallow groundwater seepage.

It was observed that an approximately 6” diameter PVC pipe was discharging a small amount of water into the eastern side of the pond basin. The PVC pipe was assumed to be discharging treated water from the water treatment plant, although the connection between the plant and the discharge pipe was not observed (Photo 5). According to Figure 1, this water being treated by the plant is piped directly from the containment reservoir near the soil management area. It is estimated that the volume of water being discharged from the pipe at the time of our observations was roughly ~20 L per minute (i.e. approximately the same flow, or slightly more than is produced by a standard kitchen tap). This was observed to be approximately the same volume of water that was entering the pond basin from the property boundary swale noted above. No other surface water was observed to be entering the sediment pond basin. Despite the two observed sources of water entering the sediment pond basin and the recent heavy rainfall, the sediment pond basin did not contain any observable standing water at the time that the November 19th, 2015 site visit was conducted (Photo 6).

A photo of the sediment pond taken following a period of heavy rain by Nino Morano (CVRD) on November 13th, 2015 (Photo 7) shows approximately ~0.5 m depth of water in the pond at that time.

A large pool of surface water was observed within the northwestern portion of the rock quarry to the north of the sediment pond basin on November 19th, 2015 (Photo 8). No water control infrastructure was observed connecting this quarry pool to the sediment pond basin.

The sediment pond basin outlet pipe was not discharging water at the time of the November 19th site inspection (Photo 9) as the pond behind it did not contain any visible standing water. Based on the configuration of the outlet pipe intake, it is estimated that approximately 1.5 m depth of water would be required to be maintained within the pond for water to reach the outlet intake.

Despite the presence of the empty sediment pond basin, flowing water was observed within a shallow swale (ephemeral stream) approximately 15 m down slope (west) of the outlet pipe on


CVRD property (Photo 10). The stream consisted of relatively fast flowing water (~1 m wide by ~3 to 5 cm deep on average) that emerged from below a layer of rip-rap and coarse rock fill contained within the swale. It was estimated that the flow of water within the stream at the time of the site visit was at least an order of magnitude larger than the total volume of surface water observed to be flowing into the empty sediment pond basin from the 6” PVC pipe and the new rock-lined swale at its south end.

4. DISCUSSION AND CONCLUSION

It appears that the site of the previously observed overland flow at (A) on Figure 1 corresponds to the location of a planned discharge point for diverted surface waters contained within a series of diversion ditches. However, the recent mitigation by SIA includes the installation of new drainage diversions to redirect the diverted runoff water away from the property boundary. The new rock-filled swale discharges into the south end of the sediment pond.

It is apparent from our observations that the sediment pond basin is relatively porous and only able to hold water for relatively short periods of time following heavy rainfall. Despite more than 80 mm of rain falling during the previous week prior to our November 19th site visit, the presence of standing water within the pond 6 days earlier and the presence of water discharging into the pit at the time of the site visit, the pit was observed to contain no visible standing water.

The presence of the large volume of water emerging from under the rock armour at the head of the ephemeral stream indicates that runoff storm water sourced from the SIA site is bypassing the sediment pond (i.e. by flowing under it) and is being discharged directly onto the land owned by the CVRD.

The As-Built Water Management System summary letter produced for the BC Ministry of Environment (Ref. 2) notes that “Surface flows originating from precipitation within the active quarry are collected in a topographic low area and then channeled to the sedimentation pond as shown on Figure 1” and “Diverted surface waters report directly to the pond, and post treatment “contact water” also reports to the Sedimentation Pond from the water treatment plant”. However, the location of the “topographic low” is not shown on Figure 1 and the fate of infiltrating rainwater or infiltrating diverted waters on the site is also not directly discussed. We suspect that the “topographic low” referred to in the As-Build document may be the quarry pool shown in Photo 8.

Section 7.6 of the SIA Environmental Procedures Manual (Ref. 6) notes that:

“The final rock surface at the base of the quarry consists of a layer of broken rock from blasting. This broken rock layer has been levelled off with crush gravel to prepare a surface for the clay/till liner. The broken rock layer and crush gravel will have significant permeability, and will act as a drainage blanket for any groundwater seepage that may occur from the base of the pit and from the sidewalls. This groundwater seepage, if it occurs, will migrate through the subsurface to the ephemeral tributary to the west of the site.”


This transmissive broken rock layer is almost certainly the conduit for the water emerging at the head of the ephemeral stream. However, it is our opinion that the majority of the discharge volume contained within the stream is storm water that infiltrated into the shallow-subsurface on the SIA site, as well as storm and post-treatment water that infiltrated through the bottom of the sediment pond basin.

Documents produced by the BC Ministry of Environment indicate that all surface water (contact and non-contact water) is required to be “contained on the property and treated in accordance with the permit” (Ref. 4) and “Clean surface runoff will be kept separate from the active areas and diverted to the setting pond” (Section 3.2.2 of Reference 5). While SIA’s WMP includes some provisions to address “surface” water, the provisions for infiltrating rainwater (and any associated management requirements) are not clearly laid out. In our opinion, storm water from a facility that handles contaminated soil should be managed in a way that allows for contaminant sampling and controlled discharge.

Photo 11 shows the Cell 1 portion of the landfill area on November 19th, 2015. At least three excavators and a large number of workers were busy in the area working to move and cover exposed soil with poly sheeting. It is not clear from SIA’s WMP how rainfall falling within this portion of the site is contained and managed, particularly during intermittent filling stages prior to the final placement of the landfill cap. Ref. 3 notes that this portion of the site is underlain by “blast rock debris that has significant permeability”. Their discussions note the ability of this permeable layer to convey “any seepage that may occur into the pit bottom from groundwater flow through the underlying or adjacent bedrock” and “The seepage will be conveyed through the subsurface toward the west slope and may report to the ephemeral tributary”. However, the potential role of this layer in conveying infiltrating storm water, particularly during cell construction, is not directly discussed.

5. RECOMMENDATIONS

A more detailed assessment of the current water management practices at the SIA site, particularly in the area of Cell #1 (including during its construction) would be required to assess the environmental risk to CVRD property. The recommended assessment would require the cooperation of SIA (and their consultants) to answer specific detailed questions and facilitate access to their property and water management infrastructure in particular.

It is recommended that the CVRD bring our observations and concerns regarding SIA’s water management system to the attention of SIA and the BC Ministry of Environment. It is unclear if the apparent, relatively permeable nature of the sediment pond basin is consistent with its intended design and/or if the infiltration and uncontrolled discharge of storm water from the SIA site is compatible with the site’s discharge permit.

It is recommended that a weir be installed on the ephemeral stream so that the water discharge within the stream can be accurately measured and compared to local precipitation data and available SIA waste water discharge volumes. The small pond that will form behind the weir would facilitate future water sample collection.


6. REFERENCES

1. Active Earth Engineering. 2012. Technical Assessment for Authorization to Discharge Waste. Report submitted to the BC Ministry of Environment dated August 2012.

2. Active Earth Engineering. 2013. As-Built Summary – Water Management System Authorization to Discharge Waste Permit PR-105809 640 Stebbings Road, Shawnigan Lake, BC. Letter to the BC Ministry of Environment dated December 6, 2013.

3. Active Earth Engineering. 2013. Seepage Blanket Details, Authorization to Discharge Waste Permit PR-105809 640 Stebbings Road, Shawnigan Lake, BC. Letter to the BC Ministry of Environment dated December 10, 2013.

4. BC Ministry of Environment. 2015. Compliance with permit PR-105809. Letter with Inspection Record provided to Cobble Hill Holdings Ltd. dated November 18, 2015.

5. BC Ministry of Environment. 2013. Ministry Assessment, Permit Application. Report to Hubert Bunce from Luc Lachance dated August 20, 2013.

6. South Island Aggregates. 2015. Environmental Procedures Manual Waste Discharge Permit PR-105809. Report dated July 2015.

7. CLOSURE

We trust the above provides the information you require at this time. If you have any questions regarding this proposal, please contact the undersigned.

Yours truly, Thurber Engineering Ltd. Stephen Bean, M.Eng., P.Eng. Review Principal

Paul Wilson, M.Sc., P.Geo. Project Geoscientist Attachments Statement of Limitations and Conditions

Figure 1 Drawing Produced by Active Earth Engineering (not to scale) Site Photos

STATEMENT OF LIMITATIONS AND CONDITIONS

1. STANDARD OF CARE

This Report has been prepared in accordance with generally accepted engineering or environmental consulting practices in the applicable jurisdiction. No other warranty, expressed or implied, is intended or made.

2. COMPLETE REPORT

All documents, records, data and files, whether electronic or otherwise, generated as part of this assignment are a part of the Report, which is of a summary nature and is not intended to stand alone without reference to the instructions given to Thurber by the Client, communications between Thurber and the Client, and any other reports, proposals or documents prepared by Thurber for the Client relative to the specific site described herein, all of which together constitute the Report.

IN ORDER TO PROPERLY UNDERSTAND THE SUGGESTIONS, RECOMMENDATIONS AND OPINIONS EXPRESSED HEREIN, REFERENCE MUST BE MADE TO THE WHOLE OF THE REPORT. THURBER IS NOT RESPONSIBLE FOR USE BY ANY PARTY OF PORTIONS OF THE REPORT WITHOUT REFERENCE TO THE WHOLE REPORT.

3. BASIS OF REPORT

The Report has been prepared for the specific site, development, design objectives and purposes that were described to Thurber by the Client. The applicability and reliability of any of the findings, recommendations, suggestions, or opinions expressed in the Report, subject to the limitations provided herein, are only valid to the extent that the Report expressly addresses proposed development, design objectives and purposes, and then only to the extent that there has been no material alteration to or variation from any of the said descriptions provided to Thurber, unless Thurber is specifically requested by the Client to review and revise the Report in light of such alteration or variation.

4. USE OF THE REPORT

The information and opinions expressed in the Report, or any document forming part of the Report, are for the sole benefit of the Client. NO OTHER PARTY MAY USE OR RELY UPON THE REPORT OR ANY PORTION THEREOF WITHOUT THURBER’S WRITTEN CONSENT AND SUCH USE SHALL BE ON SUCH TERMS AND CONDITIONS AS THURBER MAY EXPRESSLY APPROVE. Ownership in and copyright for the contents of the Report belong to Thurber. Any use which a third party makes of the Report, is the sole responsibility of such third party. Thurber accepts no responsibility whatsoever for damages suffered by any third party resulting from use of the Report without Thurber’s express written permission.

5. INTERPRETATION OF THE REPORT

a) Nature and Exactness of Soil and Contaminant Description: Classification and identification of soils, rocks, geological units, contaminant materials and quantities have been based on investigations performed in accordance with the standards set out in Paragraph 1. Classification and identification of these factors are judgmental in nature. Comprehensive sampling and testing programs implemented with the appropriate equipment by experienced personnel may fail to locate some conditions. All investigations utilizing the standards of Paragraph 1 will involve an inherent risk that some conditions will not be detected and all documents or records summarizing such investigations will be based on assumptions of what exists between the actual points sampled. Actual conditions may vary significantly between the points investigated and the Client and all other persons making use of such documents or records with our express written consent should be aware of this risk and the Report is delivered subject to the express condition that such risk is accepted by the Client and such other persons. Some conditions are subject to change over time and those making use of the Report should be aware of this possibility and understand that the Report only presents the conditions at the sampled points at the time of sampling. If special concerns exist, or the Client has special considerations or requirements, the Client should disclose them so that additional or special investigations may be undertaken which would not otherwise be within the scope of investigations made for the purposes of the Report.

b) Reliance on Provided Information: The evaluation and conclusions contained in the Report have been prepared on the basis of conditions in evidence at the time of site inspections and on the basis of information provided to Thurber. Thurber has relied in good faith upon representations, information and instructions provided by the Client and others concerning the site. Accordingly, Thurber does not accept respons bility for any deficiency, misstatement or inaccuracy contained in the Report as a result of misstatements, omissions, misrepresentations, or fraudulent acts of the Client or other persons providing information relied on by Thurber. Thurber is entitled to rely on such representations, information and instructions and is not required to carry out investigations to determine the truth or accuracy of such representations, information and instructions.

c) Design Services: The Report may form part of design and construction documents for information purposes even though it may have been issued prior to final design being completed. Thurber should be retained to review final design, project plans and related documents prior to construction to confirm that they are consistent with the intent of the Report. Any differences that may exist between the Report’s recommendations and the final design detailed in the contract documents should be reported to Thurber immediately so that Thurber can address potential conflicts.

d) Construction Services: During construction Thurber should be retained to provide field reviews. Field reviews consist of performing sufficient and timely observations of encountered conditions in order to confirm and document that the site conditions do not materially differ from those interpreted conditions considered in the preparation of the report. Adequate field reviews are necessary for Thurber to provide letters of assurance, in accordance with the requirements of many regulatory authorities.

6. RELEASE OF POLLUTANTS OR HAZARDOUS SUBSTANCES

Geotechnical engineering and environmental consulting projects often have the potential to encounter pollutants or hazardous substances and the potential to cause the escape, release or dispersal of those substances. Thurber shall have no liability to the Client under any circumstances, for the escape, release or dispersal of pollutants or hazardous substances, unless such pollutants or hazardous substances have been specifically and accurately identified to Thurber by the Client prior to the commencement of Thurber’s professional services.

7. INDEPENDENT JUDGEMENTS OF CLIENT

The information, interpretations and conclusions in the Report are based on Thurber’s interpretation of conditions revealed through limited investigation conducted within a defined scope of services. Thurber does not accept responsibility for independent conclusions, interpretations, interpolations and/or decisions of the Client, or others who may come into possession of the Report, or any part thereof, which may be based on information contained in the Report. This restriction of liability includes but is not limited to decisions made to develop, purchase or sell land.

HKH/LG_Dec 2014

pwilsonTypewritten Text

pwilsonTypewritten Text(A)





Client: Cowichan Valley Regional District Date: December 1, 2015 File No.: 10368 Photo page 1 of 10 E-File: pjw_10368_photos for report.doc

PHOTO 1: Looking north at the recent water diversion works along the property line (A) on Figure 1.


PHOTO 2: Looking up east from (A) at the diversion ditch which caused water to cross the property boundary prior to the site visit.


PHOTO 3: New rock filled swale directing surface runoff into the sediment pond visible in the distance.


PHOTO 4: Looking south at the south end of the rock-lined swale along a portion of the western property boundary. A small amount of water was being discharged into the south end of the sediment pond basin at the location of the filter cloth.


PHOTO 5: Water treatment plant and discharge point on the eastern edge of sediment pond basin. Note small amount of water exiting the PVC pipe.

PHOTO 6: Empty sediment pond basin with no standing water observed.


PHOTO 7: Photo of water in sediment pond basin taken on November 13, 2015. Note relatively small discharge volume emanating from PVC pipe.


PHOTO 8: Pond of free-standing water at the northwestern corner of the quarry, immediately north of the sediment pond. Note the presence of gravelly soil and rock at the base of the quarry.


PHOTO 9: Sediment pond basin outlet


PHOTO 10: Ephemeral stream on CVRD land emerging from the rock-lined draw west of the SIA sediment pond.


PHOTO 11: Small, recently excavated diversion ditch (lower right foreground in shadow) that conveys water away from the property line towards the active landfill area (background). At least three excavators and a large number of workers were moving and covering exposed soil within the Cell 1 area at the time of the November 19th, 2015 site visit.

Madrone report CVRD December 1, 201515.0343 - 1 CVRD SIA Interim Ltr re Nov 13_Final To Client_SS15.0343 - EXOVA Lab Results Lot 1106623 to Client.pdfExova Results for 20151113 sampling - Lot 1106623-4

15.0343 - 2 CVRD Surface Water Chemistry Table 1 (Nov13 FINAL)15.0343 - 3 CVRD Surface Water Chemistry Table 2 (Nov13 FINAL)15.0343 - 4 CVRD Surface Water Chemistry Table 3 (Nov13 FINAL)15.0343 - 5 CVRD Surface Water Chemistry Table 4 (Nov13 FINAL)15.0343 - 6 CVRD Surface Water Chemistry Table 5 (Nov13 FINAL)15.0343 - 7 EXOVA Lab Results Lot 1106623 to ClientExova Results for 20151113 sampling - Lot 1106623-4

Thurber Report CVRD December 1, 2015

Date post:	09-Oct-2020
Category:	Documents
Upload:	others
View:	1 times
Download:	0 times