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Former Wood Treating Site
Salisbury, Maryland
Recovery Well
Highlights

FTS successfully petitioned the MDEP to eliminate annual groundwater sampling in the former spray field area and to reduce the frequency of residential sampling from semi-annual to annual. The impact of these scope changes is a $17,000 annual cost reduction. The related cost would have been incurred annually for the life of the client’s monitoring obligation.

FTS successfully petitioned the MDEP to terminate operation of Northeast air sparge treatment system. FTS subsequently, replaced the existing 25hp air compressor with a 7.5 horse power claw air compressor capable of sustaining the calculated SCFM consumption of the remaining air sparge well network.  Annual cost savings associated with the system optimization are estimated at $25,000 for the life of the treatment system’s operation.

Regulatory Agency

Maryland Department of Environmental Protection/Administrative Consent Order

COC

Creosote (DNAPL), PAHs, chromated copper arsenate (CCA), pentachlorophenol

Project Description

The former wood treating facility was originally constructed in 1933 and was operated until 1983. The facility utilized creosote, pentachlorophenol, and copper-chromium-arsenic (CCA). The Site is located approximately seven miles west of Salisbury, Maryland on the Wicomico River.  The Site, consisting of eight parcels, encompasses approximately 216 acres. The property is located within the Chesapeake Bay Critical Area.

Site operations and maintenance activities address the following remediation components: a subsurface barrier, a dense non-aqueous phase liquid (DNAPL) recovery system, in-situ bioremediation systems, a phytoremediation system, surface covers, and wetland mitigations. All groundwater is re-injected via recirculation wells or infiltration galleries.  

Current Activities Performed
  • Daily operation of the groundwater recovery system ensuring target extraction rates are achieved;
  • Manual DNAPL recovery as required;
  • Weekly water and DNAPL level measurements at all 11 DNAPL recovery wells;
  • Routine operation of bioremediation areas including air injection flow rates and monthly dissolved oxygen readings in the sparging areas (38 points);
  • Routine flow and conductivity probe adjustment in the infiltration galleries and the recirculation wells to maximize site DNAPL recovery;
  • Complete compressor service of the gate and northeast compressors;
  • Routine maintenance of all recovery system components;
  • Phyto-remediation monitoring;
  • Annual monitoring of 28 monitoring wells, parameters analyzed include PAHs, total phosphorus, nitrate, nitrite, total nitrogen and plate count;
  • Annual monitoring of 3 deep zone wells, parameters analyzed include VOCs, PAHs and total metals;
  • Semi-annual monitoring of 4 residential wells, parameters  analyzed include PAHs, pentachlorophenol and total metals;
  • Semi-annual monitoring of 11 DNAPL recovery wells, parameters analyzed include oil and grease;
  • Annual inspection and gauging of 103 monitoring wells;
  • Annual inspection and maintenance of the facility and cap;
  • Permit compliance activities including onsite review of Manifest’s and LDR’s, SAP, HASP, training records, financial assurance documentation, annual review and updates to the OM&M manual and PPC Plan;
  • Preparation and submittal of the semi-annual progress reports, annual residential monitoring report and individual resident letters, and semi-annual water withdrawal reports; and,
  • Waste management activities including hazardous storage area inspections, preparation of monthly waste inventory report, handling and labeling of waste, schedule and coordinate shipping of waste to disposal facility and recertification of waste profiles.

 

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