Pilot Test for Evaluating the Effectiveness of Enhanced In-Situ Biodegradation for Soil Remediation

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

Presented by GSI Environmental Inc., this popular and informative training series is a must for professionals who need a working understanding of TRRP and those needing to stay up-to-date with the latest TCEQ TRRP guidance and policies.

TRRP Training Course (2 Days): Provides an overview of the TRRP framework and step-by-step training on property assessment and response action procedures established under the TRRP rule

Attendees will become acquainted with rules, key guidance and policies covering affected property assessments, protective concentration levels, and response actions. The course material presents strategies for efficient project management in compliance with TRRP and explains the various report forms adopted by TCEQ.

Dates and Location

Dates

June 14th and 15th, 2022

Location

Crowne Plaza River Oaks 2712 SW Freeway Houston, Texas 77098 713.523.8448 http://www.crowneplaza.com/

Price and Registration

Early-Bird Price

(Paid by May 1, 2022)
$XXX

Standard Price

(Paid after May 1, 2022)
$XXX

TAEP Membership Price

$XXX

Government Price

$XXX

Lodging and meals are not
included in course cost

Authors: Charles J. Newell, John A. Connor, John T. Wilson

Published: September 1990 in Natioanal Groundwater Association (NGWA) pages 369-383.

Abstract

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A large scale pilot test was performed to determine if soil rinsing augmented by in-situ biodegradation will provide superior remediation results compared to soil rinsing alone. The remediation effort is directed at 4 acres of shallow fill soils (ranging from 3 to 8 feet in thickness) affected by a mixture of volatile organics. A conceptual remediation design using a computer biodegradation model indicated that in-situ bioremediation had the potential for significantly reducing the time required for the site clean-up: an estimated 8 years for soil rinsing alone, vs. 3 years for soil rinsing with in-situ biodegradation.

A site characterization program was conducted in January, 1990 to determine the distribution of volatile organics and dissolved oxygen at the site, and to measure key hydrogeologic parameters. The relatively low hydraulic conductivity of the fill soils (1 x 10-3 cm/sec to 1 x 10-4 cm/sec) prompted the selection of wellpoints to hydraulically control two test areas: a 200-foot by 20-foot biotest area, and a similarly sized soil rinsing only are. The injection water for the biotest area was designed to simulate indigenous microorganisms in the fill soil by controlling pH, removing residual chlorine, and adding nutrients and oxygen to the injection stream. A one-page soil rinsing system was employed to take advantage of inexpensive wastewater treatment capacity currently available at the site.

After 11 weeks of operation, the pilot test indicated soil rinsing was effective in removing organics from the fill soil, and that naturally occurring microorganism population were stimulated in the biotest area. As the pilot system will be operated indefinitely, a more detailed analysis of the relative performance of soil rinsing and in-situ biodegradation will be possible as new data are collected.

Modifications of the system operation schedule are now being evaluated to make the system more efficient, including such options as using nitrate as the nitrogen source and changing the soil rinsing flow pattern from a constant flow to a fill-and-draw system.