Geosynthetics October/November 2020 - 20

CCR landfill final cover test pad-Part 2

was constructed with cushion geotextile
beneath the IDS geomembrane and the
first 18 inches (45.7 cm) of cover soil,
with a maximum particle size of 4 inches
(10.2 cm); the other half had no cushion
geotextile and cover soil with a maximum particle size of 9 inches (22.9 cm).
The resulting combinations of materials
tested in the various test pad subareas are
presented in Table 1.

2016 temporary access
road construction and
investigation
After the initial 18 inches (45.7 cm)
of soil was placed using an LGP dozer
over the lower bench of the test pad, an
additional 18 inches (45.7 cm) of nonprocessed (maximum 9-inch [22.9-cm]
particles) soil was placed on lower bench
Subareas C, D, E and F, for a total cover
thickness on the bench of 3 feet (0.9 m).
A fully loaded Cat 745C articulated truck
with Michelin 29.5R25 tires at 65 psi
(448 kPa) tire pressure then made 100
passes over the bench with the 3-foot
(0.9-m) thickness of cover (Figure 1 on
pages 18-19).
Afterward, portions of the trafficked
bench were exhumed. GAI Consultants
Inc. (GAI) observed the geotextile was

FIGURE 2 Exhuming cover soil at Subarea D. No damage to geotextile was observed.
The geotextile is being cut to allow observation of the geomembrane.

Test Pad
Portion

Maximum
Angular Subgrade
Protrusion
inches (cm)

First Lift1

Second Lift1

Third Lift2

inches (cm)

inches (cm)

inches (cm)

Cover Soil
Maximum
Rock Size,
First Lift
inches (cm)

Cover Soil Lift Thickness

Cushion Geotextile
Between Subgrade
and Geomembrane?

Tested as
Haul Road?

A

1 (2.5)

12 (30.5)

6 (15)

NA

4 (10)

No

No

B

1 (2.5)

18 (46)

NA

NA

9 (23)

No

No

C&E

1 (2.5)

12 (30.5)

6 (15)

18 (46)

4 (10)

Yes

Yes

D&F

1 (2.5)

18 (46)

NA

9 (23)

9 (23)

No

Yes

NA = Not applicable

1Tracked

with low ground pressure dozer

2Tracked

with 100 passes of fully loaded 45-ton truck

TABLE 1 Combinations of materials tested
20

Geosynthetics | October November 2020

1020GS_p18-25.indd 20

9/22/20 12:51 AM



Geosynthetics October/November 2020

Table of Contents for the Digital Edition of Geosynthetics October/November 2020

Geosynthetics October/November 2020 - Cover1
Geosynthetics October/November 2020 - Cover2
Geosynthetics October/November 2020 - 1
Geosynthetics October/November 2020 - 2
Geosynthetics October/November 2020 - 3
Geosynthetics October/November 2020 - 4
Geosynthetics October/November 2020 - 5
Geosynthetics October/November 2020 - 6
Geosynthetics October/November 2020 - 7
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Geosynthetics October/November 2020 - 16
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Geosynthetics October/November 2020 - 47
Geosynthetics October/November 2020 - 48
Geosynthetics October/November 2020 - Cover3
Geosynthetics October/November 2020 - Cover4
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 1
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 2
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 3
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 4
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 5
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 6
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 7
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 8
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