Harper Environmental Associates, 1811 Hale Hollow Road, Bridgewater Corners, VT 05035 (802) 672-6112 UNDERGROUND STORAGE TANK CLOSURE REPORT Report Date: October 27, 2011 SITE: Tenney Residence Location: 185 Twin Pond Road, N. Pomfret, VT Owner: Mr. Duncan Tenney, 26. W Cheyenne Mtn. Blvd, Colorado Springs, CO 80906 Harper Env. Project Mgr.: Cliff Harper, P.G. SCOPE OF WORK On October 7 and 13, 2011 the closure by removal of one 1,000-gallon fuel oil UST and removal of the vent and fill line was completed. Inspection of the UST, surrounding tank soils, and soil screening under the tank was performed by Harper Environmental. A report of soil conditions and UST condition was presented to the owner. Determined a release of fuel oil into soils associated with one 1,000-gallon UST. Tank cradle/soil screening had elevated PID readings and visual impact to the soil. PERSONNEL Cliff Harper, Hydrogeologist, Harper Environmental Associates, (802) 672 6112 Ross McCredy, Project Scientist, Harper Environmental Associates Mike Barry, Master Technician, HEA PROJECT NARRATIVE Date Completed: The 1,000-gallon UST was uncovered by the contractor for the owner during the beginning of October 2011. Harper Environmental Associates (HEA) conducted vacuum truck removal of liquids from the tank and tank pit, completed the tank pit inspection, and cut and cleaned the tank on October 13, 2011. Location of UST: The 1,000-gallon UST was located along the left (north side of the house. The centerline of the UST was parallel to the foundation wall and approximately 10 feet from the foundation wall. The top of the UST was located approximately 2 feet below grade and the base of the tank was at approximately 6 feet below grade. The location of the UST can be seen on the site sketch.
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UNDERGROUND STORAGE TANK CLOSURE REPORT Report Date: October 27, 2011
SITE: Tenney Residence Location: 185 Twin Pond Road, N. Pomfret, VT Owner: Mr. Duncan Tenney, 26. W Cheyenne Mtn. Blvd,
Colorado Springs, CO 80906 Harper Env. Project Mgr.: Cliff Harper, P.G.
SCOPE OF WORK On October 7 and 13, 2011 the closure by removal of one 1,000-gallon fuel oil UST and removal of the vent and fill line was completed. Inspection of the UST, surrounding tank soils, and soil screening under the tank was performed by Harper Environmental. A report of soil conditions and UST condition was presented to the owner. Determined a release of fuel oil into soils associated with one 1,000-gallon UST. Tank cradle/soil screening had elevated PID readings and visual impact to the soil.
PERSONNEL
Cliff Harper, Hydrogeologist, Harper Environmental Associates, (802) 672 6112 Ross McCredy, Project Scientist, Harper Environmental Associates Mike Barry, Master Technician, HEA
PROJECT NARRATIVE Date Completed: The 1,000-gallon UST was uncovered by the contractor for the owner during the beginning of October 2011. Harper Environmental Associates (HEA) conducted vacuum truck removal of liquids from the tank and tank pit, completed the tank pit inspection, and cut and cleaned the tank on October 13, 2011. Location of UST: The 1,000-gallon UST was located along the left (north side of the house. The centerline of the UST was parallel to the foundation wall and approximately 10 feet from the foundation wall. The top of the UST was located approximately 2 feet below grade and the base of the tank was at approximately 6 feet below grade. The location of the UST can be seen on the site sketch.
Surrounding Land Use: Rural, residential property with surrounding forested land. Geology/ Hydrogeology: Soil consisted of impermeable gray silt and clay with few cobbles. Groundwater was encountered in the pit and had to be removed with a vacuum truck prior to removing the UST. No bedrock was encountered during the completion of the excavation. Contaminant Investigation Results: Inspected soils from the tank cradle with a PID. PID readings from the wall of the tank pit were 97 ppm; soil from the center of the UST was screened at 85 ppm and rainbow sheens were observed in the accumulated groundwater in the tank pit. A release of fuel oil was determined. After the groundwater and UST contents were removed by a vacuum truck, sludge was also removed from the base of the tank pit with the vacuum line. The UST was removed and two soil samples were taken from the sidewall and floor of the excavation and analyzed for TPH-GC. TPH levels were relatively low, ranging from 390- 600 ppm. PID readings in the same locations ranged from 0-22 ppm in the sidewall to 0-18 ppm along the base of the excavation. Analytical Lab Results: Two soil samples were sent to the analytical laboratory after the groundwater was removed from the tank pit. (Lab Results attached) Results: TPH by GC Aromatic Volatiles (7 analytes) Base Sample 390 PPM ND (not detected) Sidewall Sample 600 PPM ND
Reason for Closure: Liability concerns UST Size/Contents/Age/Condition: 1,000-gallon/fuel oil/~20+ years/poor condition with corrosion holes along the bottom of the tank. The excavation was partially backfilled due to the pending soil analytical results. The tank was cut and cleaned of remaining fuel oil sludge and taken off-site for recycling. See attached photos.
Initial Site Characterization: Excavation Depth Excavation
Size LxW
Peak PID ppm
Depth of
Peak
Avg. PID
Reading
Bedrock? Groundwater? Soil Type
UST
6
12 X 7
98
4.5
56
no
yes
Gray Silt w/cobbles
Sensitive Receptor Discussion: Soil: Soils surrounding the UST were checked for VOC readings with a PID. Results were 0 to 98 ppm. Groundwater: Groundwater was encountered in the tank pit. Surface water: Two ponds are located west of the site along Twin Pond Road Drinking water: Onsite drinking water well located south of the former UST. Living Spaces: Basement located next to UST. Conclusions/Recommendations: A release of fuel oil from the UST was determined. After the groundwater and UST liquid contents were removed by a vacuum truck, sludge was also removed from the base of the tank pit. Two soil samples were taken from the sidewall and floor of the excavation and analyzed for TPH-GC. TPH levels ranged from 390- 600 ppm. PID readings in the same locations ranged from 0-22 ppm in the sidewall to 0-18 ppm along the base. We recommend sampling the onsite water supply, and receiving access to the residence to screen the lower level for VOCs with a PID.
Attn: Mr. Cliff HarperHarper Environmental Associates1811 Hale Hollow RdBridgewater Corners, VT 05035
Project ID: TENNEY RESIDENCE
This laboratory is in compliance with the QA/QC procedures outlined in EPA 600/4-79-019, Handbook for Analytical Quality in Water and Waste Water, March 1979, SW846 QA/QC and NELAC requirements of procedures used.
This report contains results for the parameters tested, under the sampling conditions described on the Chain Of Custody, as received by the laboratory.
A scanned version of the COC form accompanies the analytical report and is an exact duplicate of the original.
Sincerely yours,
Laboratory DirectorPhyllis Shiller
Enclosed are revised Analysis Report pages. Please replace and discard the original pages. If you have any questions concerning this testing, please do not hesitate to contact Phoenix Client Services at ext. 200.