Title page for ETD etd-051499-130633


Type of Document Master's Thesis
Author Latimer II, Henry Augustus
Author's Email Address hlatimer@vt.edu
URN etd-051499-130633
Title An Ecotoxicological Evaluation of Active Coal Mining, Sedimentation and Acid Mine Drainage in Three Tributaries of the Leading Creek Watershed, Meigs County, Ohio
Degree Master of Science
Department Biology
Advisory Committee
Advisor Name Title
Cherry, Donald S. Committee Chair
Johnson, David M. Committee Member
Simmons, George M. Jr. Committee Member
Zipper, Carl E. Committee Member
Keywords
  • total dissolved solids
  • sodium
  • acid mine drainage
  • coal mine effluent
  • sedimentation
Date of Defense 1999-05-10
Availability unrestricted
Abstract
Three streams (Parker Run, Little Leading Creek and Thomas Fork) in the

Leading Creek watershed, Meigs County, Ohio were impacted by active coal mining,

agricultural and abandoned mined land sedimentation and acid mine drainage (AMD),

respectively. An ecotoxicological evaluation was performed using physical (water

chemistry and sediment depth analyses), toxicological (acute water column, chronic

sediment and 35-day in situ toxicity tests) and ecological (benthic macroinvertebrate

community sampling) parameters. Persistent acute toxicity (mean 48-hr LC50 of 30.3%

to C. dubia) due to low pH (mean of 5.4) and high concentrations of dissolved metals (ex:

Al ~ 10 mg/L) were responsible for the significantly depressed benthic macroinvertebrate

community sampled in Thomas Fork. Heavy sedimentation (>30 inches), with no

associated toxins, significantly decreased both abundance and diversity of benthic

macroinvertebrates in Little Leading Creek. High concentrations of sodium (mean of 910

mg/L), TDS (mean of 3,470 mg/L), and periodic acute water column toxicity (mean C.

dubia survival of 62% in 100% sample) were most likely responsible for the depressed

benthic macroinvertebrate community observed in Parker Run. In ranking the severity of

impacts, AMD was first followed by non-toxic sedimentation, and active coal mining

ranked last.

A catastrophic coal slurry spill significantly impacted the benthic

macroinvertebrate community in Parker Run in April 1997. Six sampling stations were

established to monitor the recovery of the stream’s benthic community and evaluate any

impact the active coal mine effluent had on the recovery time of the community. The

effluent, characterized by high concentrations of TDS (~4,200 mg/L), significantly

hindered benthic macroinvertebrate community recovery in Parker Run. The benthic

community at the initial spill site, which was above the active mine effluent, recovered to

levels measured at an upstream reference within 4-9 months. Benthic communities

impacted by both the slurry spill and the effluent still had not recovered 16 months after

the spill. Concentrations of TDS measured in the stream were significantly correlated (r

= -0.765 and -0.649 respectively) with both EPT richness and percent C. dubia survival

in water column toxicity tests.

Laboratory analysis of synthetic coal mine effluent, similar in composition to that

of the Parker Run effluent, was performed to determine toxicity thresholds for sodium,

sulfate, TDS and conductivity. Acute toxicity thresholds were found for sodium

(between 900 and 1,000 mg/L), TDS (4,200 and 6,400 mg/L), and conductivity (5,000 and 6,200 µmhos/cm). It was also determined that any toxic contribution of sulfate in

solution with high concentrations of sodium (~1,000 mg/L) and/or TDS (~4,200 – 6,400

mg/L) was secondary to that of the toxic effect of sodium or TDS in that solution.

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