MTI_-_Bonneville_County_Pit_Source_Expansion.pdf

Environmental Services Geotechnical Engineering Construction Materials Testing Special Inspections

1230 N Skyline Drive, Suite C Idaho Falls, ID 83402 (208) 529-8242 Fax (208) 529-6911 www.mti-id.com mti@mti-id.com

MATERIALS

TESTING &

INSPECTION

AGGREGATE SOURCE APPROVAL

Expansion of Irwin Pit

3329 Swan Valley Highway Swan Valley, Idaho

Prepared for:

Bonneville County 605 North Capital Avenue Idaho Falls, ID 83402

MTI File Number E180174g

17 September 2018 Page # 2 of 19 e180174g - irwin pit source expansion

Environmental Services Geotechnical Engineering Construction Materials Testing Special Inspections www.mti-id.com mti@mti-id.com Copyright © 2018

Materials Testing & Inspection

TABLE OF CONTENTS

Authorization Scope of Investigation Project Description and Site Location Exploration and Sampling Procedures Laboratory Testing Program Soil and Sediment Profile Warranty and Limiting Conditions Summary of Suitability Testing Sieve Analysis Specific Gravity and Absorption of Fine Aggregate Specific Gravity and Absorption of Coarse Aggregate Sulfate Soundness Fine Aggregate Sulfate Soundness Coarse Aggregate Durability Index Fine Durability Index Coarse LA Abrasion of Small Size Coarse Aggregate Sand Equivalent Value Appendices

Geotechnical General Notes Geotechnical Investigation Test Pit Logs Vicinity Map Site Map

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Authorization

Authorization to perform this exploration and analysis was given in the form of a written authorization to proceed from Steve Rounds of Bonneville County, Public Works Director to Brenda Stevens of Materials Testing and Inspection (MTI).

Scope of Investigation

The scope of this investigation included a visual site reconnaissance of the immediate site, subsurface exploration, field and laboratory testing of materials collected, and this report per requirements outlined in the email dated 25 July 2018.

Project Description and Site Location

The existing borrow and aggregate source is north of Irwin northeast of US Highway 26 in Bonneville County, Idaho. It is located within the NW¼, SE¼ of the SE¼ of Section 17, Township 1 North, Range 44 East, Boise Meridian. The proposed expansion area is approximately 7.1 acres in size.

The site is accessed from US Highway 26 to the access road directly south of 3325 US-26, Swan Valley, ID. The site lies on the north side of the access road, approximately 0.15 mile east of the highway.

Exploration and Sampling Procedures

Field exploration conducted to determine engineering characteristics of subsurface materials included a reconnaissance of the project site and investigation by test pit. Test pit sites were located in the field by means of a Global Positioning System (GPS) device and are reportedly accurate to within 15 feet. Upon completion of investigation, each test pit was backfilled with loose excavated materials.

In addition, samples were obtained from representative soil strata encountered. Samples obtained have been visually classified in the field by a staff geologist, identified according to test pit number and depth, placed in containers, and transported to our laboratory for additional testing. Subsurface materials have been described in detail on logs provided in the Appendix. Results of field and laboratory tests are also presented in the Appendix.

MTI recommends that these logs not be used to estimate material quantities.

Laboratory Testing Program

Along with our field investigation, a supplemental laboratory testing program was conducted to determine additional pertinent engineering characteristics of subsurface materials. Laboratory tests were conducted in accordance with current applicable American Association of State Highway and Transportation Officials (AASHTO) specifications, and results of these tests are to be found on the accompanying logs located in the Appendix.

Samples were obtained from 5 evenly spaced depths in each of the 5 test pits. Each of the 5 samples from each test pit was then combined to create 1 composite sample from each test pit.

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Soil and Sediment Profile

The profile below represents a generalized interpretation for the project site. Note that on site soils strata, encountered between test pit locations, may vary from the individual soil profiles presented in the logs, which can be found in the Appendix.

Silty sand sediments were encountered at ground surface. These sediments were found to be brown, dry, and dense to very dense with fine-grained sand. Below the overburden material, poorly graded gravel with sand was encountered. These gravels were brown to light gray, dry to saturated, and dense to very dense, with fine to coarse-grained sand, fine to coarse-grained gravel, and 24-inch-minus boulders.

Weak to strong calcium carbonate cementation was observed in the upper portions of the gravel. Groundwater was encountered in all test pits at depths ranging between 15.5 to 17.0 feet below existing ground surface (bgs).

Warranty and Limiting Conditions

MTI warrants that findings and conclusions contained herein have been formulated in accordance with generally accepted professional engineering practice in the fields engineering, soil mechanics, and engineering geology only for the site and project described in this report. These engineering methods have been developed to provide the client with information regarding apparent or potential engineering conditions relating to the site within the scope cited above and are necessarily limited to conditions observed at the time of the site visit and research.

Field observations and research reported herein are considered sufficient in detail and scope to form a reasonable basis for the purposes cited above.

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Summary of Suitability Testing

The following table has been prepared to summarize test results of aggregate suitability testing of samples obtained during the onsite exploration activities. Testing was performed on uncrushed aggregates. More detailed explanation of test results has been presented in the appendix of this report.

Test Standard Results

TP 1 TP 2 TP 3 TP 4 TP 5

Specific Gravity – Fine

AASHTO T-84

2.537 2.537 2.544 2.510 2.526

Specific Gravity – Coarse

AASHTO T-85

2.633 2.627 2.631 2.586 2.631

Sulfate Soundness – Fine

AASHTO T-104

1.2 0.9 1.4 1.2 1.0

Sulfate Soundness – Coarse

AASHTO T-104

0.0 0.0 0.0 0.0 0.1

Durability Index – Fine

AASHTO T-210

58 69 71 63 67

Durability Index – Coarse

AASHTO T-210

90 87 90 90 87

LA Abrasion

AASHTO T-96

14 17 19 15 14

Sand Equivalent

AASHTO T-176

55 52 51 43 50

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Sieve Analysis

Source and Description: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: X AASHTO T2: ASTM D421: X AASHTO T87:

Test Standard: ASTM C117: X AASHTO T11: ASTM D1140: ASTM D5444:

ASTM C136: X AASHTO T27: ASTM D422: AASHTO T88:

SIEVE

SIZE

PERCENT PASSING

TP 1 TP 2 TP 3 TP 4 TP 5

7” 100 100 100 6” 91 95 100 97 5” 87 95 100 96 93 4” 86 87 90 91 89 3” 77 75 76 78 74 2” 68 57 61 66 63

1 1/2” 60 50 54 59 55 1” 48 41 43 46 42

3/4” 40 35 36 38 35 1/2” 30 29 28 28 25 3/8” 26 26 24 25 21 #4 22 20 18 19 16 #8 19 17 15 14 13

#10 19 16 14 14 13 #16 18 15 13 12 12 #30 17 13 13 11 12 #40 16 13 12 11 11 #50 13 11 10 10 9

#100 5 4 4 5 3 #200 2.3 2.2 2.2 3.0 1.5

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Specific Gravity and Absorption of Fine Aggregate

Source: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: AASHTO T2: X ASTM D421: X AASHTO T87:

Test Standard: ASTM C128: AASHTO T84: X

Sample TP 1 TP 2 TP 3 TP 4 TP 5 Bulk Specific Gravity 2.537 2.537 2.544 2.510 2.526 Bulk SSD Specific Gravity 2.588 2.587 2.592 2.574 2.583 Apparent Specific Gravity 2.672 2.676 2.673 2.681 2.679 Oven Dry Density (lb/ft3) 157.9 157.9 158.4 156.2 157.2 Absorption (%) 2.0 2.1 1.9 2.5 2.3

Specific Gravity and Absorption of Coarse Aggregate

Source: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: AASHTO T2: X ASTM D421: X AASHTO T87:

Test Standard: ASTM C127: AASHTO T85: X

Bulk Specific Gravity 2.633 2.627 2.631 2.586 2.631 Bulk SSD Specific Gravity 2.648 2.645 2.648 2.601 2.647 Apparent Specific Gravity 2.673 2.675 2.678 2.625 2.675 Oven Dry Density (lb/ft3) 163.9 163.5 163.8 161.0 163.8 Absorption (%) 0.5 0.7 0.7 0.6 0.6

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Sulfate Soundness Fine Aggregate

Source: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: AASHTO T2: X ASTM D421: AASHTO T87: X

Test Standard: ASTM C88: AASHTO T104: X Solution: Sodium: X Magnesium: Fresh Prepared: Previously Used: X

TP 1

Sieve Size Weight of Test Fraction Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

#4 #8 99.9 0.9 0.3 #8 #16 100.1 1.1 0.1 #16 #30 99.9 1.4 0.2 #30 #50 100.0 1.3 0.6

Total 1.2

TP 2

Sieve Size Weight of Test Fraction Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

#4 #8 100.0 1.0 0.3 #8 #16 100.1 1.1 0.2 #16 #30 100.1 0.9 0.2 #30 #50 99.9 0.8 0.2

Total 0.9

TP 3

Sieve Size Weight of Test Fraction Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

#4 #8 100.0 1.3 0.5 #8 #16 100.1 1.2 0.3 #16 #30 99.9 0.9 0.0 #30 #50 100.0 1.5 0.6

Total 1.4

TP 4

Sieve Size Weight of Test Fraction Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

#4 #8 100.0 1.3 0.7 #8 #16 100.0 0.7 0.2 #16 #30 100.0 0.5 0.1 #30 #50 99.9 1.5 0.2

Total 1.2

TP 5

Sieve Size Weight of Test Fraction Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

#4 #8 100.1 0.8 0.3 #8 #16 99.9 1.0 0.1 #16 #30 100.0 0.8 0 #30 #50 100.0 1.3 0.6

Total 1.0

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Sulfate Soundness Coarse Aggregate

Source: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: AASHTO T2: X ASTM D421: AASHTO T87: X

Test Standard: ASTM C88: AASHTO T104: X Solution: Sodium: X Magnesium: Fresh Prepared: Previously Used: X

TP 1

Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

4” 3.5” 7294.9 0.1 0 3.5” 3” 6541.7 0.1 0 3” 2.5” 6957.4 0.1 0

2.5” 2” 3155.9

0.2 0

2” 1.5” 2188.2 1.5” 1.0” 9888.8

0.1 0 1.0” ¾” 494.4 ¾” ½” 672.4

0.2 0 ½” 3/8” 329.0

3/8” #4 298.8 0.1 0 Total 0

TP 2

Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

4” 3.5” 7051.3 0.1 0 3.5” 3” 6941.9 0.1 0 3” 2.5” 6900.1 0.1 0

2.5” 2” 3257.1

0.2 0

2” 1.5” 2071.3 1.5” 1.0” 1007.9

0.2 0 1.0” ¾” 500.7 ¾” ½” 662.7

0.3 0 ½” 3/8” 329.7

3/8” #4 301.4 0.1 0

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TP 3

Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

4” 3.5” 6951.4 0.1 0 3.5” 3” 6155.4 0.1 0 3” 2.5” 7497.4 0.1 0

2.5” 2” 3004.3

0.2 0

2” 1.5” 194.3 1.5” 1.0” 1041.8

0.4 0 1.0” ¾” 491.6 ¾” ½” 670.4

0.1 0 ½” 3/8” 333.3

3/8” #4 297.7 0.3 0

TP 4

Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

4” 3.5” 6154.7 0.1 0 3.5” 3” 6743.9 0.1 0 3” 2.5” 7144.8 0.1 0

2.5” 2” 3147.9

0.2 0

2” 1.5” 1904.6 1.5” 1.0” 994.7

0.4 0 1.0” ¾” 475.9 ¾” ½” 678.3

0.1 0 ½” 3/8” 329.3

3/8” #4 304.7 0.2 0

TP 5

Before Test

% Passing Designated Sieve After Test

Weighted % Loss Passing Retained

4” 3.5” 7943.2 0.0 0 3.5” 3” 7059.7 0.1 0 3” 2.5” 7089.3 0.1 0

2.5” 2” 2904.1

0.1 0

2” 1.5” 2051.3 1.5” 1.0” 1037.6

0.4 0.1 1.0” ¾” 501.9 ¾” ½” 670.4

0.2 0 ½” 3/8” 326.4

3/8” #4 296.1 0.1 0 Total 0.1

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Durability Index Fine

Source: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: AASHTO T2: X ASTM D421: AASHTO T87: X

Test Standard: ASTM D2419: AASHTO T210: X

Fine Durability Index 58 69 71 63 67

Durability Index Coarse

Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5 Sampling and Preparation: ASTM D75: AASHTO T2: ASTM D421: AASHTO T87:

Test Standard: ASTM D7344: AASHTO T210: X

Fine Durability Index 90 87 90 90 87

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LA Abrasion of Small Size Coarse Aggregate

Source: Irwin Pit Gravel Source Testing Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5

Test Standard: ASTM C131: AASHTO T96: X

Nominal Maximum Size of Aggregate 6” 5” 5” 4” 5” Grading Designation A A A A A Percent Loss by Abrasion 14 17 19 15 14

Sand Equivalent Value

Date Obtained: August 24, 2018

Sample ID: TP 1 – TP 5

Test Standard: ASTM D2419: AASHTO T176: X

Sand Equivalent Value 55 52 51 43 50

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Appendices

Geotechnical General Notes Geotechnical Investigation Test Pit Logs Vicinity Map Site Map

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Geotechnical General Notes

RELATIVE DENSITY AND CONSISTENCY CLASSIFICATION

Coarse-Grained Soils SPT Blow Counts (N) Fine-Grained Soils SPT Blow Counts (N)

Very Loose: < 4 Very Soft: < 2 Loose: 4-10 Soft: 2-4

Medium Dense: 10-30 Medium Stiff: 4-8 Dense: 30-50 Stiff: 8-15

Very Dense: >50 Very Stiff: 15-30 Hard: >30

Moisture Content Cementation Description Field Test Description Field Test

Dry Absence of moisture, dusty, dry to touch Weakly Crumbles or breaks with handling or slight finger pressure

Moist Damp but not visible moisture Moderately Crumbles or beaks with considerable finger pressure

Wet Visible free water, usually soil is below water table

Strongly Will not crumble or break with finger pressure

PARTICLE SIZE

Boulders: >12 in. Coarse-Grained Sand: 5 to 0.6 mm Silts: 0.075 to 0.005 mm Cobbles: 12 to 3 in. Medium-Grained Sand: 0.6 to 0.2 mm Clays: <0.005 mm Gravel: 3 in. to 5 mm Fine-Grained Sand: 0.2 to 0.075 mm

UNIFIED SOIL CLASSIFICATION SYSTEM

Major Divisions Symbol Soil Descriptions

Coarse-Grained Soils <50% passes No.200 sieve

Gravel & Gravelly Soils <50% coarse fraction passes No.4 sieve

GW Well-graded gravels; gravel/sand mixtures with little or no fines

GP Poorly-graded gravels; gravel/sand mixtures with little or no fines

GM Silty gravels; poorly-graded gravel/sand/silt mixtures

GC Clayey gravels; poorly-graded gravel/sand/clay mixtures

Sand & Sandy Soils >50% coarse fraction passes No.4 sieve

SW Well-graded sands; gravelly sands with little or no fines

SP Poorly-graded sands; gravelly sands with little or no fines

SM Silty sands; poorly-graded sand/gravel/silt mixtures

SC Clayey sands; poorly-graded sand/gravel/clay mixtures

Fine Grained Soils >50% passes No.200 sieve

Silts & Clays

LL < 50

ML Inorganic silts; sandy, gravelly or clayey silts

CL Lean clays; inorganic, gravelly, sandy, or silty, low to medium-plasticity clays

OL Organic, low-plasticity clays and silts

Silts & Clays

LL > 50

MH Inorganic, elastic silts; sandy, gravelly or clayey elastic silts

CH Fat clays; high-plasticity, inorganic clays

OH Organic, medium to high-plasticity clays and silts

Highly Organic Soils PT Peat, humus, hydric soils with high organic content

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Geotechnical Investigation Test Pit Logs

Test Pit Log #: TP-1 Date Advanced: 6 Aug 2018 Logged by: Troy A. Posio

Excavated by: Rockin’ T Excavation Location: See Site Map Plates

Latitude: 43.41336 Longitude: -111.29819

Depth to Water Table: 16.4 Feet bgs Total Depth: 19.0 Feet bgs

Depth (Feet bgs)

Field Description and USCS Soil and Sediment Classification

Sample Type

Sample Depth (Feet bgs)

Qp Lab

Test ID

0.0-1.7 Silty Sand (SM): Brown, dry, dense to very dense, with fine-grained sand.

1.7-19.0

Poorly Graded Gravel with Sand (GP):

Brown to light gray, dry to saturated, dense to very dense, with fine to coarse-grained sand, fine to coarse-grained gravel, and 6-inch-minus cobble.

--Weak to strong calcium carbonate cementation noted to approximately 4.0 feet bgs.

--Walls started caving at 9.5 feet bgs.

Bulk

Composite sample composed from (5) evenly spaced depths

Test Pit Log #: TP-2 Date Advanced: 6 Aug 2018 Logged by: Troy A. Posio

Excavated by: Rockin’ T Excavation Location: See Site Map Plates

Latitude: 43.41415 Longitude: -111.29828

Depth to Water Table: 16.8 Feet bgs Total Depth: 19.0 Feet bgs

Field Description and USCS Soil and Sediment Classification

Sample Type

Sample Depth (Feet bgs)

Qp Lab

Test ID

0.0-1.7

1.7-19.0

Brown to light gray, dry to saturated, very dense, with fine to coarse-grained sand, fine to coarse-grained gravel, and 6-inch-minus cobble.

-- Weak to strong calcium carbonate cementation noted to approximately 4.1 feet bgs.

Bulk

Composite sample composed from (5)

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Test Pit Log #: TP-3 Date Advanced: 6 Aug 2018 Logged by: Troy A. Posio

Latitude: 43.41470 Longitude: -111.29780

Depth to Water Table: 15.5 Feet bgs Total Depth: 18.5 Feet bgs

Field Description and USCS Soil and Sediment Classification

Sample Type

Sample Depth (Feet bgs)

Qp Lab

Test ID

0.0-2.3

2.3-18.5

Brown to light gray, dry to saturated, dense to very dense, with fine to coarse-grained sand, fine to coarse-grained gravel, and 4-inch-minus cobble.

-- Weak to strong calcium carbonate cementation noted to approximately 3.5 feet bgs.

--Walls started caving at 15.5 feet bgs.

Bulk

Composite sample composed from (5)

Test Pit Log #: TP-4 Date Advanced: 6 Aug 2018 Logged by: Troy A. Posio

Latitude: 43.41419 Longitude: -111.29736

Depth to Water Table: 15.9 Feet bgs Total Depth: 17.0 Feet bgs

Field Description and USCS Soil and Sediment Classification

Sample Type

Sample Depth (Feet bgs)

Qp Lab

Test ID

0.0-1.0

1.0-17.0

Brown to light gray, dry to saturated, dense, with fine to coarse-grained sand, fine to coarse-grained gravel, and 5-inch-minus cobble.

-- Weak to strong calcium carbonate cementation noted to approximately 3.0 feet bgs.

--18-inch boulders noted below 15.0 feet bgs.

Bulk

Composite sample composed from (5)

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Test Pit Log #: TP-5 Date Advanced: 6 Aug 2018 Logged by: Troy A. Posio

Latitude: 43.41399 Longitude: -111.29659

Depth to Water Table: 17.0 Feet bgs Total Depth: 18.0 Feet bgs

Field Description and USCS Soil and Sediment Classification

Sample Type

Sample Depth (Feet bgs)

Qp Lab

Test ID

0.0-2.2

2.2-18.0

Brown to light gray, dry to saturated, dense to very dense, with fine to coarse-grained sand, fine to coarse-grained gravel, and 5-inch-minus cobble.

-- Weak to strong calcium carbonate cementation noted to approximately 1.5 feet bgs.

--24-inch boulders noted below 15.5 feet bgs.

Bulk

Composite sample composed from (5)