MEMORANDUM - Regional Municipality of Haltonwebaps.halton.ca/Planning/Dufferin Aggregates Acton Quarry/Techni… · Ron Glenn, Region of Halton Tom Farrell/Steve Strong, MNR Nancy

651 Colby Drive, Waterloo, Ontario, Canada N2V 1C2 Telephone: (519) 884-0510 Fax: (519) 884-0525 www.CRAworld.com

MEMORANDUM

TO: Tom Renic, Region of Halton Diane Bloomfield, CH Liam Marray, CVC Brigid Burke, MOE

REF. NO.: 030193-10

FROM: Nicholas Fitzpatrick/Richard Murphy/kf/84 DATE: October 27, 2014

CC: Ron Glenn, Region of Halton Tom Farrell/Steve Strong, MNR Nancy Mott, NEC John Kinkead, CVC Mark Kluge, Town of Halton Hills Enzo Bertucci/Bill Galloway, Dufferin Brian Zeman, MHBC

RE: Revised Quarry Water Budget Update Acton Quarry Extension, Town of Halton Hills

1.0 Introduction

Conestoga-Rovers & Associates (CRA) has prepared this document to provide an update of the groundwater modelling, quarry design water budget, and lake filling time for the proposed Acton Quarry Extension. These results revise and update the material in the CRA Memorandum of August 23, 2012 to reflect the removal of Phase 7 and requested changes to the Phase 4 and Phase 5/6 West extraction limits. The findings described herein are consistent with previous reporting and discussions. The groundwater modelling results indicate the effectiveness of the proposed mitigation and rehabilitation measures. This information is presented in the following order: • Updated groundwater modelling results (updated simulations for the scenarios originally presented in

the Geology and Water Resources Assessment [GWRA] report [CRA, 2008] Section 10.3, with the current proposed extraction footprint)

• Updated quarry design water budget calculations and averaged lake filling time (GWRA Tables 10.2 to 10.6 plus J.11)

CRA MEMORANDUM Page 2

2.0 Updated Groundwater Model Results

The groundwater modelling presented in the August 23, 2012 memorandum was updated to reflect changes to the footprint. Phase 7 was removed from the footprint, and minor changes were made to the Phase 4 and Phase 5/6 West extraction limits. The mitigation for the full extraction condition and rehabilitation condition were adjusted accordingly. Minor refinements to the groundwater modelling simulations that have been implemented since August 2012 are also incorporated 1 but do not affect the basic results or conclusions from the analyses. The groundwater model results continue to show the effectiveness of the proposed mitigation measures and rehabilitation measures in maintaining groundwater levels to protect water resources and related ecological features from the potential drawdown effects associated with the proposed Extension. Further, in a number of areas, the proposed measures would also result in some increases in current approved (future) groundwater levels that will tend to beneficially increase groundwater discharge and support to nearby water resources and related ecological features. These results can most clearly be seen by looking at the drawdown figures that compare the proposed Extension conditions to the approved Existing Quarry approved conditions (Figures 4 and 6 as described below). The four principal conditions that have been simulated and are presented in this update, include: i. Approved Existing Quarry full extraction conditions ii. Approved Existing Quarry rehabilitation conditions iii. Proposed Existing plus Extension Quarry full extraction with mitigation conditions iv. Proposed Existing plus Extension Quarry rehabilitation conditions These enclosed results for these conditions are described below. i. The approved Existing Quarry full extraction conditions are presented with Figure 1 showing the

simulated groundwater elevation contours. Under these conditions, Phases 1, 2, and 3 are fully quarried out. They are represented as dry extraction cells with no major surface water present in the extraction areas.

ii. The approved Existing Quarry rehabilitation conditions are presented with Figure 2 showing the simulated groundwater elevation contours. Under these conditions, Phases 1, 2, and 3 are fully quarried out and rehabilitated to vegetated areas with a surface water body (approximately 47 hectares [ha]) present in Phase 1.

1 The refinements implemented include:

a) The recharge rate used over the Extension-related lake areas (Phases 3 to 6) for the proposed Existing plus Extension Quarry rehabilitation conditions was reduced from 250.4 millimetres per year (mm/year) to 180.4 mm/year reflecting the revised 694.7 mm/year lake evaporation rate identified in CRA’s August 9, 2012 memorandum.

b) The MODFLOW re-wetting specifications were revised to prevent double-counting of recharge over dry quarry areas in the extraction scenarios.

c) Refinement of local boundary conditions specifications and model precision to enhance solution convergence and leading to reduced model volumetric budget residual.


iii. The proposed Existing plus Extension Quarry full extraction with mitigation conditions are presented with Figure 3 showing the groundwater elevation contours. Under these conditions, Phases 1 through 6 are fully quarried out as dry cells with a surface water body (approximately 47 ha) present in Phase 1. Figure 4 shows the drawdown or mounding under these conditions relative to the approved Existing Quarry full extraction conditions (i). Note most areas exhibit mounding, with the small areas of drawdown limited to upland areas adjacent to the extraction area.

iv. The proposed Existing plus Extension Quarry rehabilitation conditions are presented with Figure 5 showing the groundwater elevation contours. Under these conditions Phases 1 through 6 are fully mined and rehabilitated to a “lakes full” condition – specifically: a) Phase 1 – vegetated with a surface water body (below surrounding groundwater levels) b) Phase 2/5 East – vegetated with a surface water body (below surrounding groundwater

levels) c) Phase 3/5/6 West – rehabilitated to a lake supporting surrounding groundwater levels d) Phase 4 – rehabilitated to a lake supporting surrounding groundwater levels

Figure 6 shows the drawdown or mounding under these conditions relative to the approved Existing Quarry rehabilitation conditions (ii). Note most areas exhibit increased groundwater elevations (mounding) in Extension influenced areas with the only exception being a localized neutral (no appreciable mounding or drawdown) area west of Phase 4 where the only water resources features are fully protected by the continued seasonal use of mitigation measures as described in the AMP (i.e., diffuse surface water discharge). 3.0 Updated Quarry Water Budget

The quarry design water budget presented in the August 23, 2012 memorandum, and originally in Section 10.3 (and Appendix J) of the GWRA was also further updated and refined. In addition to the changes related to the groundwater model described above, there were some minor refinements to the areas used to extract data from the model, and to calculate volumes in the budget, in order to increase accuracy and make sure that all the areas were consistent with the groundwater modelling and hydrologic water balance work. The revised results are presented in updated versions of the GWRA Tables 10.2 through 10.5 and Table J.11 (from Appendix J of the GWRA). Figure 7 is provided along with these tables to illustrate the groundwater discharge zones referenced in the tables. The lake filling time estimate from the GWRA was also updated and is presented herein as a revised version of the corresponding Table 10.6. Previously the lake filling time was calculated from lake volumes that conservatively assumed the lake area had an average depth based on the Site Plans and no backfilling of slopes. The estimated lake filling time has now been calculated to account for the soil placement within the quarry cell (hydraulic buttresses and, rehabilitation slopes, etc.) and refinement of the quarry/floor elevations in the Existing Quarry. These refinements result in somewhat lower water filling volumes and times compared to previous calculations.


These water budget results indicate that there is sufficient water for all mitigation, operations, and lake filling requirements with substantial water remaining for surface water discharge during extraction, lake filling and under long‐term conditions. The filling time calculations are based on 50 percent of the available water (after mitigation and operational demands are met) being used for lake filling while the remaining 50 percent is discharged downstream consistent with the agreed upon water hierarchy and allocation. The lake filling time calculated in Table 10.6 is 31 years after the end of extraction and start of lake filling in Phase 4, assuming storage volume remains available throughout the filling period following extraction of Phase 4. It is noted that the groundwater modelling provides a conservatively high estimate of the potential mitigation flow requirements. The modelling represents annual average conditions; however, mitigation flows may only be needed seasonally, particularly for the diffuse surface water discharges. In the event that shorter mitigation operation times are suitable (as agreed with the agencies during AMP meetings in 2014), additional water will be available to be allocated to lake filling and off‐site discharge. For a very simplistic example, the surface water discharges for the Extension and Existing Quarry mitigation case total approximately 830,000 cubic metres per year (m3/year) (“Wetland Recharge” in Table 10.4). If it is assumed that only half this flow/duration is actually necessary to protect water resources, there would be an additional 415,000 m3/year of available water. If realized, this amount of water would significantly increase the rate of lake filling estimated above (more than one‐third higher) and is therefore an important consideration in the establishment of Performance‐Based Targets (PBTs) for the AMP as has been discussed with the agencies in the establishment of PBTs. The potential difference is much smaller under long‐term rehabilitation conditions. Note: Water allocation and hierarchy considerations included in the August 23, 2012 Memorandum were previously updated and reported in the CRA Memorandum of June 10, 2013. A further update is being provided in a separate CRA Memorandum to reflect the modifications described herein and to account for the revision of the watershed boundary delineation following agreement by Credit Valley Conservation and Conservation Halton to the culvert reinstated across 22nd Sideroad by the Town of Halton Hills in fall 2012. List of Attachments: Figure 1 Simulated Groundwater Elevation Existing Quarry Approved Extraction Condition Figure 2 Simulated Groundwater Elevation Existing Quarry Approved Rehabilitation Condition Figure 3 Simulated Groundwater Elevation Full Existing and Extension Extraction with Mitigation Figure 4 Simulated Groundwater Level Change Full Existing and Extension Extraction with Mitigation Figure 5 Simulated Groundwater Elevation Full Existing and Extension Rehabilitation Condition Figure 6 Simulated Groundwater Level Change Full Existing and Extension Rehabilitation Condition Figure 7 Water Management Areas – Key Plan Table 10.2 (Updated) Water Budget‐Existing Quarry Approved Extraction Condition Table 10.3 (Updated) Water Budget‐Existing Quarry Approved Rehabilitation Condition Table 10.4 (Updated) Water Budget‐Full Existing and Extension Extraction with Mitigation Table 10.5 (Updated) Water Budget‐Full Existing and Extension Rehabilitation Table 10.6 (Updated) Full Rehabilitation Sequential Lake Filling Time Estimate Table J.11 (Updated) Simulated Groundwater Discharge to Surface Water

PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1

22ND SIDEROAD22ND SIDEROAD

GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W4

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-dW10-b

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

BLACK CREEK

TRIB

UTARY

A TRIB

UTAR

Y B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

ACTON SWAMP(NORTH)

ACTON SWAMP(SOUTH)

354

352

350

344342

344

344

342

352

350

348 346

338342346

350352

348

350

348

354

352

350

356

356

354

352

350

348

344

338

340

346344

342

EXISTING LICENCE LIMIT

BRUCE TRAIL (APPROXIMATE)

OTHER PROPERTY BOUNDARYDUFFERIN OWNED PROPERTY LIMIT

PROVINCIALLY SIGNIFICANT WETLAND (MNR OCTOBER 2011)

ROAD

UNCLASSIFIED WATERCOURSE

EPHEMERAL FLOW

CHANNELIZED/DITCHED EPHEMERAL FLOWPERENNIAL FLOW

DIFFUSE WETLAND/WOODLOT/FIELD EPHEMERAL FLOW

INTERMITTENT FLOW

CHANNELIZED/DITCHED INTERMITTENT FLOW

PROPOSED EXTRACTION LIMIT

LEGENDRAILROAD

EXISTING EXTRACTION LIMIT





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD


SOURCE: BASE MAPPING OBTAINED FROM NORTHWAY PHOTOMAPINC., DERIVED FROM NOVEMBER 22, 2001 AERIAL PHOTOGRAPHY.

SIMULATED GROUNDWATER ELEVATION CONTOUR (m AMSL)350

figure 1SIMULATED GROUNDWATER ELEVATION

EXISTING QUARRY APPROVED EXTRACTION CONDITIONACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA001 JUL 16/2014

NOTE: SIMULATION FE117.

0 250 375m125

PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1


GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W4

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-dW10-b

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

FLOODEDLAND

BLACK CREEK

TRIB

UTARY

A TRIB

UTAR

Y B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

ACTON SWAMP(NORTH)

ACTON SWAMP(SOUTH)

342

352

350 348

346

344

348

346

344342

340

354

352

350

346

342

356

354

352

350

348

346

344342

344

354

352

350

356

350

350

350

348

348

350

356

354

352





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD






ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD




EXISTING QUARRY APPROVED REHABILITATION CONDITIONACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA002 JUL 16/2014



0 250 375m125

PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1


GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W4

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-dW10-b

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

BLACK CREEK

TRIB

UTARY

A TRIB

UTAR

Y B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

PHASE 4 - (3)

PHASE 4 - (1)

PHASE 4 - (2)

PHASE 6 - (1)

PHASE 5 - (2)

PHASE 5 - (1)

354

352

350

348

346

344

356

354

352

350

348

342

344

354

356352

334

336

348334

348

332

330

350346

354

356

354

352

350

350

350

348

348

356

354

352

350

342

344

344

348

346

358

340





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD


DIRECT MITIGATION





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD


DIRECT MITIGATION


SIMULATED GROUNDWATER350figure 3

SIMULATED GROUNDWATER ELEVATIONFULL EXISTING AND EXTENSION EXTRACTION WITH MITIGATION

ACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA003 JUL 21/2014


SIMULATED RECHARGE WELL

DIRECT MITIGATIONAREA FOR WATER BUDGET CALCULATIONSPHASE 3 - (2) AS PRESENTED IN TABLE 10.4

0 250 375m125

ELEVATION CONTOUR (m AMSL)

PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1


GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W4

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-d

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

BLACK CREEK

TRIB

UTARY

A TRIB

UTAR

Y B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

PHASE 4 - (3)

PHASE 4 - (1)

PHASE 4 - (2)

PHASE 6 - (1)

PHASE 5 - (2)

PHASE 5 - (1)

1.0

0.2

0.52.0

4.0

-4.0

-15.0-2.0

-6.0

-1.0

-10.0

1.0

0.2

0.5

4.0

6.0

-2.0-10.0

2.0

0.2

0.5

1.0 -6.0

-0.5-1.0-2.0

2.0





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD


DIRECT MITIGATION





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD


DIRECT MITIGATION


figure 4SIMULATED GROUNDWATER LEVEL CHANGE

FULL EXISTING AND EXTENSION EXTRACTION WITH MITIGATIONACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA004 JUL 21/2014

NOTE: WATER LEVEL CHANGE IS RELATIVE TO THEEXISTING APPROVED EXTRACTION CONDITION.

SIMULATED RECHARGE WELLNEGATIVE CONTOURS: WATER LEVEL DECREASE (m)-1.0POSITIVE CONTOURS: WATER LEVEL INCREASE (m)1.0

NOTE: SIMULATION FE185-FE117.

DIRECT MITIGATION

0 250 375m125

PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1


GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W6

W4

W9-b

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-dW10-b

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

BLACK CREEK

TRIB

UTARY

A TRIB

UTAR

Y B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

356

356

354

354

352

352

350

350

348

348

352

352

350

350

354

354

352

350

344342

346

344

342

342

344

348350

352

358

354

352350

354

348

346

344





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD






ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD




FULL EXISTING AND EXTENSION REHABILITATION CONDITIONACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA005 JUL 16/2014

NOTE: SIMULATION FR182.


0 250 375m125

PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1


GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W4

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-d

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

BLACK CREEK

TRIB

UTARY

A TRIB

UTAR

Y B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

7.0

5.03.02.0

1.0

4.0

0.50.2

6.0

-0.2

1.0

0.5

0.2

1.0

0.5

0.5

1.0

0.2

2.0

3.04.05.06.0

7.08.010.011.0

0.20.5

1.02.0

3.04.0

6.0

4.0

2.0

1.0





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD






ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD



figure 6SIMULATED GROUNDWATER LEVEL CHANGE

FULL EXISTING AND EXTENSION REHABILITATION CONDITIONACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA006 JUL 16/2014

NOTE: WATER LEVEL CHANGE IS RELATIVE TO THEEXISTING QUARRY APPROVED REHABILITATION CONDITION.

SIMULATED RECHARGE WELLNEGATIVE CONTOURS: WATER LEVEL DECREASE (m)-1.0POSITIVE CONTOURS: WATER LEVEL INCREASE (m)1.0

NOTE: SIMULATION FE182-FE119.

0 250 375m125





ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD






ROAD


EPHEMERAL FLOW



INTERMITTENT FLOW



LEGENDRAILROAD


PRIMARY CRUSHER

SCALES

LOWER SETTLING POND

UPPER SETTLING POND

PHASE 3 PHASE 2

PROCESSINGAREA

4TH

LIN

E

3RD LINE

PHASE 1


GLEN LAWSON ROAD

3RD

LIN

E

RE

GIO

NA

L R

OA

D 2

5

YARD

LOWERPLANT

PHASE5 EAST

PHASE5 WEST/6 WEST

PHASE 4

U2

U3

U11

U16

U17

U5

U1

U13

U12

U4

U25

U26

U24

U23

U27

U18

U19

U20

U29

W4

W9-a

W10

W2-N

W2-S

W3

W1

W5

W10-a

W10-d

BCA-1

BCA-2

BCA-3

W9-S

W9-N

W9-X

U6

U7

U30U8

U32

U31

U15

F/L

FLOODEDLAND

BLACK C

REEK

4TH LIN

E TRIBU

TARY TO

BLACK CREEKTR

IBUTA

RY A TR

IBUT

ARY

B

TRIB

UTA

RY

C

CREEKTO BLACK

TRIBUTARY

FAIRY LAKE

AREA D

AREA B

AREA L

AREA N

AREA G

AREA E

AREA I

AREA J

AREA C

AREA O

AREA F

AREA M

AREA K

B3

B2B1

A1

A2

D1

D2

I1

I2

M1

M2

AREA A

figure 7WATER MANAGEMENT AREAS - KEY PLAN

ACTON QUARRY EXTENSION

30193-10(MEMO084)GN-WA007 JUL 17/2014


0 250 375m125

TABLE 10.2(Updated from GWRA)

WATER BUDGET - EXISTING QUARRY APPROVED EXTRACTION CONDITIONACTON QUARRY EXTENSION

TOWN OF HALTON HILLS, ONTARIO

Page 1 of 1October 27, 2014

CRA 030193Memo84

Available Water from Precipitation

(Runoff and/or Infiltration)(m³/year) (m³/year) (m³/year)

560,377 250,100 810,478458,007 105,965 563,972

175,089 238,171 413,260 1,193,473 594,237 1,787,710

Total Available Water = 1,787,710

Notes:

(1) Runoff (Precipitation - Evapotranspiration) was used as water available from rainfall in dry quarry area.(2) Drainage to quarry phase, infiltration to vegetated area in quarry, and runoff in dry quarry areas are considered as available water for discharge.(3)

(4) Phase 1 and 2 consist of dry quarry and vegetation (no lake in Phase 1).(5) Phase 3 consists of dry quarry only.

Phase 2Phase 3

As a long-term condition, runoff of 575.1 mm/yr was used for dry quarry, 358.7 mm/year was used for Phase 1 vegetation, and 367.2 mm/year was used for Phase 2 vegetation.

Simulated Groundwater Inflow Total Available Water in PhaseLocation

Phase 1


WATER BUDGET - EXISTING QUARRY APPROVED REHABILITATION CONDITIONACTON QUARRY EXTENSION


Page 1 of 1 October 27, 2014

CRA 030193Memo84

Available Water from Precipitation

(Runoff and/or Infiltration)(m³/year) (m³/year) (m³/year)

271,030 166,346 437,376301,113 106,325 407,438

111,794 265,885 377,679 683,937 538,555 1,222,492

Total Available Water = 1,222,492

Notes:

(1) Runoff (Precipitation - Evapotranspiration) was used as water available from rainfall in dry (revegetated) quarry area.(2) Drainage to quarry phase, infiltration to vegetated area in quarry, and runoff in dry quarry areas are considered as available water for discharge.(3)

(4) Phase 1 consists of the lake and vegetation.(5) Phases 2 and 3 are assumed to be dry and fully vegetated.

Phase 2Phase 3

As a long-term condition, runoff of 575.1 mm/yr was used for dry quarry, 347.4 mm/year was used for Phase 1 vegetation, and 367.2 mm/year was used for Phase 2 and Phase 3 vegetation.

Simulated Groundwater Inflow Total Available Water in PhaseLocation

Phase 1


WATER BUDGET - FULL EXISTING AND EXTENSION EXTRACTION WITH MITIGATIONACTON QUARRY EXTENSION



CRA 030193Memo84

Precip - Evap (1)

(Runoff and/or Infiltration)

Groundwater Inflow

(m³/year) (m³/year)

Phase 1(3) 366,023 80,547Phase 2(4) and 5 (east) 466,590 164,985Phase 3, 5 (west), and 6 (west) 302,718 851,684Phase 4 146,852 577,583

Total Available Water =

Phase 4-(1)+(2) - W1-W2-NPhase 4-(3) - U5Phase 4 - U3, U4 ,and U31 (replace runoff)(6)

Phase 5-(1) - W3-W4Phase 5-(2) - W2-S

Phase 6-(1) - U6-U7-U8

North of Phase 4South of W3 (H3)South of Phase 5/6W (H4)East of Phase 6 (H10)

Total Mitigation Recharge =

Available Surplus Water (=Total Available Water - Total Mitigation Recharge) (m3/year) = 1,545,302 (7)

Existing Approved Extraction Condition

Extension Mitigation Condition

(m³/year) (m³/year)

Re-Entrant Northwest Section(8) 131,832 133,560Re-Entrant Northeast Section(9) 95,869 105,059Escarpment South of Phase 2(10) 175,990 175,912 0%

Location

369,460

(%)

1%10%

Description

Area (5)Recharge Flow by

Wetlands/Recharge Wells

1,154,403724,434

Sum of Surface Water/Well Recharge

Net Available Flow (2)

(m³/year)

2,956,982

(m³/year)

446,570631,575

Flow

Su

mm

ary

Wet

land

Rec

harg

e

(m³/year)

203,691254,802

190,6675,294

175,359

458,493

198,098

175,359

2,137

Disc

harg

e Ra

tes

Com

paris

onW

ell

Rech

arge

115,830

Difference

369,460

115,83043,485

50,955

Discharge Rate Comparison along Re-Entrant and Escarpment

50,955

1,411,680

43,485


WATER BUDGET - FULL EXISTING AND EXTENSION EXTRACTION WITH MITIGATIONACTON QUARRY EXTENSION



CRA 030193Memo84

Notes:

(1) Surplus (Precipitation - Evapotranspiration) was used as water available from rainfall in dry quarry area.

(2) Available water in phase area.(3) Phase 1 consists of quarry, lake, and vegetation.(4) Phase 2 consists of quarry and vegetation.(5) Area definitions are on Figure 3.(6) Replace runoff from portion of catchment removed.(7)

(8) The section from the Black Creek springs to the west where the potential groundwater divide is.(9) The section from the Springs of the Black Creek to the east ending at Phase 1.(10) The section from the south edge of Phase 2 to 15th Sideroad.

Phase 2 seeps flow of 33,440 m³/year to be allocated from CVC/Black Creek portion of surplus (flow based on rate of 2.53 L/s for five months - 153 days).

Available water for dry quarry runoff is 575.1 mm/yr, 358.7 mm/yr (infiltration + runoff) for vegetation in Phase 1 and 367.2 mm for vegetation in Phase 2.


WATER BUDGET - FULL EXISTING AND EXTENSION REHABILITATIONACTON QUARRY EXTENSION



CRA 030193Memo84

Recharge (1)Groundwater

Inflow (2)

Phase LakeDewatering or

Top-up (3)

(m³/year) (m³/year) (m³/year)

Phase 1 271,030 393,014Phase 4 -116,459Phase 2 and 5 (east) 249,636 203,566Phase 3, 5 (west), and 6 (west) -133,465

Total Available Water (Beyond Top-up to Phase Lakes) =

Phase 4 - runoff makeup: (W2-N, W1, U31 - CVC) 4,216Phase 4 - runoff makeup: (U3, U4, U5 - CH) 8,647 Total Mitigation/Recharge = 12,863

Available Surplus Water (=Total Available Water - Total Mitigation/Recharge) (m3/year) = 854,460 (6)

Phase 3, 5 (west), 6 (west) to Phase 1 Phase 3, 5 (west), 6 (west) to Phase 2 and 5 (east)Phase 4 to Phase 1

Extension Rehabilitation Condition (8)

(m³/year)

Re-Entrant Northwest Section(9) 133,495Re-Entrant Northeast Section(10) 116,983Escarpment South of Phase 2(11) 175,900

Notes:

(1) Calculated based on the phase areas, if phase areas are inactive for flow in the model.(2) Simulated drainage to phase areas.(3)

(4) Net available water in phase lakes, beyond required amount for lake top-up. Negative value is the required top-up amount.(5) Mitigation recharge though selected sections of tributary wetland and top-up of Phase 4 wetlands equal to loss of runoff.(6)

(7) Simulated discharge rate along the Re-Entrant and Escarpment. Simulated discharge rates under the existing approved

(8)(9) The section from the Black Creek springs to the west where the potential groundwater divide is.(10) The section from the Springs of the Black Creek to the east ending at Phase 1.(11) The section from the south edge of Phase 2 to 15th Sideroad.

Simulated discharge under proposed Extension rehabilitation conditons.

157,786

Flow Between PhasesDescription

Phase 2 seeps flow of 33,440 m³/year to be allocated from CVC/Black Creek portion of surplus (flow based on rate of 2.53 L/s for five months - 153 days).

Discharge Rate Comparison along Re-Entrant and Escarpment

LocationDifference

(%)

Description(m³/year)

Flow to Wetlands (5)

106,651107,888

(m 3 /year)

-133,465867,322

(m³/year)

664,044-116,459453,202

Description

Phas

e Ar

ea F

low

Sum

mar

y

rehabilitation condition with Phases 1, 2, and 3 vegetated and a Lake in Phase 1.

Flux

In-

betw

een

Phas

es

Disc

harg

e Ra

tes

Com

paris

on

Top-up (negative) or dewatering (positive) rate to maintain the designed water levels. Actual volumes may vary as described in Section 10.3.

0%12%0%

Net Available Flow (4)

Wet

land

Re

char

ge

Existing Approved Rehabilitation Condition (7)

(m³/year)

132,987104,618175,996


FULL REHABILITATION SEQUENTIAL LAKE FILLING TIME ESTIMATEACTON QUARRY EXTENSION



CRA 030193Memo84

Phase LakesLake/Reservoir

Area (1)Final Lake Elevation

Lake Volume (1)(2)

Soil Volume Below Water (1)(3)

Water Volume to Fill (4)

(m²) (m AMSL) (m³) (m³) (m³) (years)

Phase 1 472,000 339.0 - 341.0 N/A N/A N/A(8) N/A

Phase 4 244,000 356.5 5,590,569 1,131,600 5,930,049 9.9 (9)

Phase 3/5 West/6 510,000 355.0 11,286,492 1,783,400 11,821,512 19.7

Phase 2/5 East 244,000 338.0 989,102 39,800 1,001,042 1.7

Total 1,226,000 17,866,163 2,954,800 18,752,603 31

Notes:

(1) From MHBC October 23, 2014 Acton Quarry, Consolidated Rehabilitation.(2) Doesn't include soil placed in quarry cell.(3) Soil placed in quarry cell. It is assumed that 30% of this volume will be filled by water (unsaturated porosity of 0.3).(4) Total lake volume + 30% of the soil volume.(5) Total available water under the full rehabilitation condition:(6) Total available water under the full extraction condition:(7) 50% of the average estimated available water (Note 5 & Note 6) was assumed to be available for lake filling: average rate of(8) Phase 1 assumed to have been previously filled to the rehabilitated level before the full extension.(9) Lake filling would be accelerated by approximately 1,000,000 m³ or 2 years using water accumulated in Phase 2 prior to start of Phase 4 lake filling.

1

2

SequenceTime to Fill Phase

Lakes (5)(6)(7)

854,460 m³/year.1,545,302 m³/year.

599,940 m³/year.

4

3

TABLE J.11(Updated from GWRA)

SIMULATED GROUNDWATER DISCHARGE TO SURFACE WATERACTON QUARRY EXTENSION



CRA 030193Memo84

Existing Quarry Approved Extraction (fe117)

Existing Quarry Approved Extraction and Rehabilitation

(fe119)

Full Existing and Extension Extraction with Mitigation

(fe130)

Full Existing and Extension Rehabilitation Condition

(fr167)(m³/year) (m³/year) (m³/year) (m³/year)

A1 0 323 0 1,480A2 24,584 46,008 56,362 73,487B1 26,406 38,890 45,124 42,187B2 0 0 155 0C 16,440 16,440 16,618 16,568

D1 8,119 9,481 28,043 28,035D2 51,365 52,468 90,496 80,794E 79,101 79,279 114,746 119,125F 3,786 3,790 4,361 5,405G 209,522 209,527 209,649 209,652H 139,357 139,357 139,448 139,556I1 72,810 72,837 98,657 98,833I2 75,095 75,096 75,207 75,431J 274,558 274,560 277,099 276,312K 1,788 988 2,101 1,251L 327 14 0 0

M2 0 0 0 18,081N 472 489 0 18,627O 0 0 0 0

983,731 1,019,547 1,158,066 1,204,826

-35,816 0 138,518 185,279

Note:

(1) Area definitions are presented on Figure 7. Only the surface drainage was accounted for (i.e., not model boundary along Escarpment/Re-Entrant which is reported in Tables J.13 and J.15 or Tables 10.4 and 10.5).

ScenarioAreas (1)

Total of Area Values

Difference Comparing to the Existing Approved Extraction and Rehabilitation Condition

Documents

MEMORANDUM - Regional Municipality of Haltonwebaps.halton.ca/Planning/Dufferin Aggregates Acton Quarry/Techni… · Ron Glenn, Region of Halton Tom Farrell/Steve Strong, MNR Nancy