Soilworks products are the industry’s top standard due to our insistence on creating high performance soil stabilization and dust control products that stand up to rigorous testing – both in the lab and in the field. Our commitment to quality and performance has led to our involvement and testing in hundreds of real-world situations. The following library of reports, presentations, specifications, approvals and other similar documents provide you, our customer, the transparency and dependable assurance that is expected from Soilworks.
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
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:
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.
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
Corporate Lab: 9063 Bee Caves Road, Austin, TX 78733 / www.geosynthetictesting.com.com Southeast Labs: 112 Martin Rd., Greenville, SC 29607 / www.erosiontest.com
Control Test Using “NW Pit Sample 5-7-21” Test Soil
Tested Products
Soiltac Application
Silt Stop After 6″ Rain Event
Soiltac After 6″ Rain Event
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
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
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
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
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
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
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
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
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
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 #:
|
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
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
Copyright Soilworks, LLC 2003-. All Rights Reserved. Soilworks®, Soiltac®,
Gorilla-Snot®, and Durasoil® are registered trademarks of Soilworks, LLC.
Copyright Soilworks, LLC 2003-. All Rights Reserved. Soilworks®, Soiltac®,
Gorilla-Snot®, and Durasoil® are registered trademarks of Soilworks, LLC.