TRI Environmental Rainfall Erosion Testing of APS Series 700 Siltstop and Soilworks Soiltac using Site Specific Soil

C. Joel Sprague, P.E. Technical Director – TRI South Carolina
2021-06-21
Golder Associates, Inc.

TRI Environmental 

TRI-MAPP Report

MAPP - BI 2021-001

Rainfall Erosion Testing

(via ASTM D7101) of 

APS Series 700 Siltstop and 

Soilworks Soiltac using Site Specific Soil

Issued June 2021

 

Final Report

Submitted to:

Golder Associates, Inc.

18300 NE Union Hill Road, Suite 200 Redmond, WA 98052

 

Attn: Scott Stoneman

E-mail: Scott_Stoneman@golder.com

 

 

Submitted by:

TRI Environmental, Inc.

9306 Bee Cave Rd. Austin, TX 78733

 

 

Prepared by:

C. Joel Sprague, P.E.

Technical Director – TRI South Carolina (864) 346-3107

jsprague@tri-env.com

 

 

Date Submitted:

June 21, 2021

continue reading...

June 21, 2021

 

Mr. Scott Stoneman Golder Associates, Inc.

18300 NE Union Hill Road, Suite 200 Redmond, WA 98052

 

E-mail: Scott_Stoneman@golder.com

 

REPORT: Rainfall Erosion Testing (via ASTM D7101) of APS 710 Silt Stop and

Soilworks Soiltac Polymers Using Site Specific Soil

 

The testing reported herein was performed in general accordance with ASTM D7101 using a site specific soil, Sample ID: “NW - Pit Sample, 5-7-21”, and two unique polymer tackifier products: APS 710 Silt Stop and Soilworks Soiltac. The tested tackifier products were applied in accordance with the manufacturer’s recommendations and exposed to the simulated runoff. The APS 710 Silt Stop application rate was 20 lbs of product in 3000 gallons of water per acre. The Soilworks Soiltac application rate was 290 gallons of product in 2600 gallons of water per acre.

The testing established the following performance characteristics (Soil Loss Ratio “SLR” and C-Factor) for the tested tackifier products by comparing product-protected soil loss to an unprotected or control scenario using the same site specific soil. A higher SLR value and lower C-Factor value represent better performance in controlling soil erosion under the tested conditions.

 

Product Identification

Soil Loss Ratio (Avg. 2”, 4”, 6”)

Average C-Factor (Avg. 2”, 4”, 6”)

Soilworks Soiltac

5.70

0.172

APS 710 Silt Stop

0.97

1.04

 

 

 

C. Joel Sprague, P.E. Technical Director TRI-South Carolina


James E. (Jay) Sprague, CPESC Laboratory Director

TRI-South Carolina

 

 

Bench-scale Slope Testing Report Evaluation of Erosion Control Products

 

TEST PROGRAM OBJECTIVES

 

Bench-scale “indexed” performance tests are a class of tests that have been developed to focus on testing the erosion control product (ECP) / soil system under carefully controlled “standard” conditions.   Since performance of an ECP relies on the complex interaction of the ECP structure with the soil and the water impact/flow, it is helpful and beneficial to be able to examine the effects of the product/soil system under relevant conditions. Bench- scale testing offers relevant conditions for evaluating relative product performance and comparing products while still facilitating lower costs and quicker testing than full-scale outdoor testing.

 

TESTING EQUIPMENT AND PROCEDURES

 

Overview of Test and Apparatus

 

The testing reported herein was performed at TRI Environmental, Inc.'s (TRI's) erosion and sediment control testing facility located at the Roads to Rivers Research Institute in Greenville, SC. The testing reported herein was performed in accordance with ASTM D7101, on 3:1 slopes using a site-specific soil sample provided by the client; “NW-Pit Sample 5/7/21”. Simulated target rainfall intensities of 2, 4, and 6 in/hr were applied in sequence for 30 minutes each. The sediment loss from the ECP-protected slopes was compared to that from unprotected “control” slopes to characterize performance.

 

Test Soil

 

The test soil used in the test plots had the following characteristics.

 

Table 1. Test Soil Sample “NW-Pit Sample 5/7/21” Characteristics

Soil Characteristic

Test Method

Value

% Gravel

 

ASTM D 422

3.5

% Sand

54.3

% Silt + % Clay

42.2

Maximum Dry Density, Lbs/Ft³

ASTM D 698

120.9

Optimum Moisture Content, %

10.9

Soil Classification

USCS

Silty Sand (SM)

 

Tested Product

 

There were two erosion control products, commonly called tackifiers, evaluated in this test program. Both products were provided by the client and are described as follows:

 

  • Soilworks Soiltac Vinyl Copolymer Soil Stabilizer & Dust Control Agent. The Soilworks Soiltac application rate was 290 gallons of product in 2600 gallons of water per acre.
  • Applied Polymer Systems, Inc. APS 710 Silt Stop. The APS 710 Silt Stop application rate was 20 lbs of product in 3000 gallons of water per acre.

 

Setup and Preparation of the Test Slopes

 

Test method ASTM D 7101, “Standard Index Test Method for Determination of Unvegetated Rolled Erosion Control Product (RECP) Ability to Protect Soil from Rain Splash and Associated Runoff under Bench-Scale Conditions” was followed in this program. This test method evaluates the ability of an ECP’s to protect soil from rain splash and immediate runoff- induced erosion. The critical element of this protection is the ability of the ECP to absorb the impact force of raindrops, thereby reducing soil particle loosening through “splash” mechanisms. The test method utilizes containers of both bare and ECP-protected soil that are exposed to simulated rainfall and immediate runoff for 30 minutes in the test apparatus. It is a sloped table enclosed by a curtain. Rainfall is simulated using a laboratory drip-type simulator capable of creating uniform drops with a median diameter of 3.0 to 3.5 mm from a drop height of 2.0±0.1 m and producing rainfall intensities as high as 150 mm/hr. The amount of soil that splashes or is washed out of the containers is collected, vacuum filtered, dried and weighed. From this data, an appropriate soil loss ratio (SLR) can be calculated by comparing the ECP-protected soil loss to the control. The inverse of the SLR is comparable to the C-factor which is more commonly used to relate to field performance.

 

Product Installation on Test Slope

 

The two erosion control products evaluated in this test program were installed per the instructions provided by the client. Both products were diluted in water at the recommended dilution ratio and applied to the surface of the individual soil cores using a pipette in an effort to uniformly apply the hydrated product at the recommended application rate. Both products were allowed to cure for 24 hours after application and prior to initiation of simulated rainfall event.

 

Specific Test Procedure

 

All three scenarios, Control or unprotected soil, soil protected with APS 710 Silt Stop and soil protected with Soilworks Soiltac, were subjected to unique rainfall simulations of 2”/hour, 4”/hour and 6”/hour for thirty minutes. The rainfall simulations were conducted using the prescribed test apparatus as outlined in ASTM D7101 “Standard Index Test Method for Determination of Unvegetated Rolled Erosion Control Product (RECP) Ability to Protect Soil from Rain Splash and Associated Runoff under Bench-Scale  Conditions.” All runoff was collected for each rainfall event. The collected runoff was vacuum filtered using a Whatman Grade 3 filter paper. The filtered soil runoff was then dried and mass of dry soil runoff determined. Pictures of test apparatus and setup are shown in Figures 1 and 2.

Picture PlaceholderPicture Placeholder

Figure 1 ASTM D7101 Test Apparatus                Figure 2 Close-up of Ramps and Collection

 

Test Results

 

The testing established the following performance characteristics (Soil Loss Ratio “SLR” and C-Factor) for the tested erosion control polymer products by comparing product soil loss to an unprotected or control scenario using the same site specific soil. A higher SLR value and lower C-Factor value represent better performance in controlling soil erosion under the tested conditions.

 

Product Identification

Soil Loss Ratio (Avg. 2”, 4”, 6”)

Average C-Factor (Avg. 2”, 4”, 6”)

Soilworks Soiltac

5.70

0.172

APS 710 Silt Stop

0.97

1.04

 

The detailed test results, including figures and tables are included in the appendix along with additional pictures of the testing.

 

Discussion

 

The experimental results of the   test   program   present   clear   evidence   that   the tested products performed very differently under the test conditions. The Soilworks Soiltac provided significant erosion protection when compared to an unprotected scenario while the APS 710 SiltStop did not provide any   significant   erosion protection under the conditions evaluated in this test program.

 

Appendix

 

 

 

Data and Figures

 

 


Erosion Control Product Testing Summary

ASTM D 7101:

STANDARD INDEX TEST METHOD FOR the DETERMINATION of UNVEGETATED ROLLED EROSION CONTROL PRODUCT (RECP) ABILITY TO PROTECT SOIL

FROM RAIN SPLASH AND ASSOCIATED RUNOFF UNDER BENCH-SCALE CONDITIONS

3:1 Slope

Raw Soil Loss Data (g)

Calculated Soil Loss Based on Regression (g)

Soil Loss Ratio & C-Factor Based on Regression Soil Loss

 

Surface Condition

Rain Intensity, mm/hr

Rain Intensity, mm/hr

Rain Intensity, mm/hr

50

100

150

50

100

150

50

100

150

CONTROL

46.7

88.9

159.4

46.7

88.9

159.4

 

 

 

Soilworks Soiltac

8.5

12.9

30.2

8.5

12.8

30.2

5.48

6.94

5.27

APS 710 Silt Stop

53.9

88.6

154.2

53.9

88.6

154.2

0.87

1.00

1.03

C-Factor (Soilworks SoilTac)

 

0.183

0.144

0.190

C-Factor (APS 710 Silt Stop)

 

1.156

0.996

0.968

* soil loss ratio = soil loss of unprotected surface (I.e. control) divided by soil loss with protected surface = 1 / C-Factor

 

 

 Chart Graph Placeholder

 

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

 

 

 

 

 

 Picture Placeholder                     

Control Test Using "NW Pit Sample 5-7-21" Test Soil 

Picture Placeholder

Tested Products

Picture Placeholder

Soiltac Application

Picture Placeholder

Silt Stop After 6" Rain Event

Picture Placeholder

Soiltac After 6" Rain Event

Picture Placeholder

Silt Stop Floc Formation on Filter Paper

 

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

 

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

RECP Slope Simulation Test

 Chart Graph Placeholder          

 

  

Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com

 

Particle Size Analysis of Soil

Revision No. 2

Revision Date: 08/29/17

 

ASTM D422

 

 

S&ME Project #:

Client Name:              TRI Environmental, Inc.

 

Address:                    112 Martin Road Greenville, South Carolina 29607

 

 

Project Name:


1426-19-038 (Ph. 10)

TRI Environmental On-Call Lab Testing


Report Date:

Test Date(s):


5/17/21

5/14 - 5/17/21

 

 

 

Boring #:

N/A

Log #:

51g

Sample Date:

subm. May 2021

Location:

NW - Pit Sample

Type:

Bulk

Depth:

N/A

Sample Description:                 silty SAND (SM) - yellow brown, medium to fine

Chart Graph Placeholder

 

 

 

Revision No. : 1 Revision Date: 07/25/17

S&ME Project #: 1426-19-038 (Ph. 10)

Report Date:            5/17/21

Project Name: TRI Environmental On-Call Lab Testing

Test Date(s): 5/15/21

 

Client Name:                TRI Environmental, Inc.

 

Client Address:            112 Martin Road Greenville, South Carolina 29607

 

Boring #: N/A

Log #: 51g

Sample Date: sub. May 2021

Location: NW - Pit Sample

Type:                 Bulk

Depth: N/A

Sample Description:            silty SAND (SM) - yellow brown, medium to fine

 Chart Graph Placeholder

 

Complete the form below to download this document now.
Fill out the form to get access to the complete article.