Notes

Outline

COMPARISON OF BEDROCK WELL WATER SAMPLING METHODS THOMAS P. BALLESTERO GONZALO PULIDO-SILVA KIMBERLY S. NEWMAN Bedrock Bioremediation Center University of New Hampshire

Acknowledgement Funding Source:  US EPA on contract   CR 827878-01-0 Pease Site Access: US Air Force Pease Development Authority

BBC Overall Objectives Improve / Develop Characterization Techniques for Groundwater Flow and Fracture Patterns Develop / Apply Innovative Microbial and Molecular Techniques to Accelerate and Monitor In Situ Bioremediation Develop Field / Lab Methods to Determine Bioremediation Rates Test/Evaluate Remediation Technologies for Organically Polluted Aquifers

Sampling Objective What are the differences in data, costs, personnel, and time for various bedrock well water sampling techniques?

Methodology Well Selection Water Quality Parameter(s) for Comparisons Sampling Methods Scheduling

Site Description Former Pease AFB – Newington, NH Overburden - as much as 30 ft. of glacial till and glaciomarine clays Bedrock - fractured metasandstones and metashales of the Silurian or Ordovician Kittery Formation TCE release into overburden and subsequent transport into bedrock

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Bedrock Wells and Soil Borings

Well Locations

Well BBC3 Competent Bedrock TCE (30-70 ug/L), DCE (100-200 ug/L), VC (4-7 ug/L), No Ethene DOC  2-4 mg/L TEAs Oxygen ? Nitrate non detect Fe+2  0.1-0.5 mg/L Sulfate  100-150 mg/L Methane  150-250 mg/L Little DOC , Mostly Sulfate and Methane Reducing Conditions-Electron Donor Limited

Most Common Site Well Water Quality Analysis VOC Analysis – EPA SW846, Third Edition Method 8260B

Well BBC 4

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Generic BBC4 Lithology 52 ft. of overburden (sand – clay – till) 19 ft. of weathered Kittery Formation 66 ft. of competent Kittery Formation 22 ft. of diabase dike 21 ft. of competent Kittery Formation

BBC4 Profile and Sample Zones

BBC4 Sample Zones Continuous – 5-FT. INTERVALS  81 – 86 ft 86 – 92 ft 92 – 97 ft 97 – 102 ft 102 – 108 ft 107 – 112 ft 113 – 118 ft 120 – 125 ft 126 – 131 ft 131 – 136 ft 137 – 142 ft 151 – 157 ft 161 – 167 ft

Sampling Methods straddle-packer low flow (EPA/540/S-95/504, December 1995) diffusion bag (Part 1: User’s Guide for Polyethylene-Based Passive Diffusion Bag Samplers to Obtain Volatile Organic Compound Concentrations in Wells, Vroblesky D.A., U.S. Geological Survey (2001) ) HydraSleeve™ ported FLUTe™

Straddle-Packer Sampling

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Low Flow Sampling

Diffusion Bag Samplers

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BBC4 with Deployed DBS’s

Removal of DBS

Hydrasleeve

FLUTe Concept

FLUTe Installation

BBC4 FLUTe Well Head

Sampling Schedule Packer – July 20 – Aug 9, 2001 Low Flow – Aug 17 – 21, 2001 Hydrasleeve – Aug 31, 2001 Diffusion Bags – Sep 20, 2001 Packer – Oct 2 – 10, 2001 FLUTe – Oct 15, 2001 Oct 23, 2001 Feb 14, 2002 Feb 26 – 27, 2002

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Cis-DCE Statistical Results

Results for cis-1,2-dichloroethene  Paired t-test differences

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Time Comparisons (For Sampling 10 zones at BBC4)

Other Considerations – part 1

Other Considerations – part 2

Other Considerations – part 3

www.bbc.unh.edu