TYPE OF SUBMITTAL PETROLEUM REIMBURSEMENT FUND PHASE Workscope/Budget Technical Report X Reimbursement Request Monitoring Result (Pre-permit) Monitoring Result (Post-permit) Initial Response Action Free product Removal Initial Site Characterization X Supplemental Site Investigation Remedial Action Plan Remedial Design Plan Remedial Implementation/O+M Groundwater Management Permit Initial Site Characterization Albro Estate 102 Prouty Hill Road Sunderland, VT Prepared For: Patricia Ludwig Executor, George W Albro 3 rd Estate 1416 Sunderland Hill Road Arlington, VT 05250 Phone: (802) 375-6965 Prepared By: Harper Environmental Associates, Inc. 1811 Hale Hollow Road, Bridgewater Corners, VT 05035 (802) 672-6112 fax (802) 672-6227 Cliff Harper, Principal April 1, 2009
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Initial Site Characterization Albro Estate 102 Prouty Hill ...
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TYPE OF SUBMITTAL PETROLEUM REIMBURSEMENT FUND PHASE
Workscope/Budget Technical Report X Reimbursement Request Monitoring Result (Pre-permit) Monitoring Result (Post-permit)
Initial Response Action Free product Removal Initial Site Characterization X Supplemental Site Investigation Remedial Action Plan Remedial Design Plan Remedial Implementation/O+M Groundwater Management Permit
Initial Site Characterization
Albro Estate 102 Prouty Hill Road
Sunderland, VT
Prepared For: Patricia Ludwig
Executor, George W Albro 3rd Estate 1416 Sunderland Hill Road
Arlington, VT 05250 Phone: (802) 375-6965
Prepared By: Harper Environmental Associates, Inc.
1811 Hale Hollow Road, Bridgewater Corners, VT 05035 (802) 672-6112 fax (802) 672-6227 Cliff Harper, Principal
April 1, 2009
April 1, 2009 Mr. Chuck Schwer, Section Chief Sites Management Section, VTDEC Waste Management Division 103 S. Main St./West Building Waterbury, Vermont 05671-0404 SUBJECT: Results of the Subsurface Investigation at the Albro Estate Residential Property, 102 Prouty Hill Road, Sunderland, VT. (Expressway Form Submitted) Dear Mr. Schwer, An intrusive field investigation was completed at the Albro Residence in Sunderland Vermont on March 17, 2009. Harper Environmental Associates, Inc. (HEA) is pleased to submit a summary of our field procedures, and the results from the groundwater & soil sampling event due to a release of fuel oil from a leaking underground storage tank (LUST). This report is subject to the limitations found in the Appendices. Site BackgroundAlan Hess of Able Realty, Arlington, VT, contracted Harper Environmental Associates (HEA) to oversee the removal of one 1,000-gallon UST from the above referenced site. Jason Homes of Home Property Maintenance completed all the excavation work and all environmental field activities were conducted by HEA on March 12, 2009. During the UST closure, by removal, petroleum hydrocarbon contamination was discovered in soils below the base of the UST. The tank was found to be in poor condition with multiple, corrosion holes along the bottom and welded end seams of the tank. Onsite soil screening for volatile organic compounds (VOCs) using a Photoionization Detector (PID) indicated soil readings as high a 185 parts per million (ppm) at approximately 6 feet below grade along the center line of the UST. Free product was not encountered in the excavation. The excavation was extended to a depth of approximately 9 feet below grade and no groundwater was encountered. Bedrock was not encountered during the excavation. The full extent of the contamination was not identified at the time of removal. The site was surveyed for sensitive receptors. Potential receptors included indoor air, soil, groundwater, nearby drinking water well and Peters Brook approximately 150 feet north of the UST. During the UST closure, contaminated soil was encountered below the bottom of the UST. Contaminated soil was excavated from the pit and placed on a dump truck. Excavated soils from below the UST cradle were visually impacted by fuel oil and exhibited a strong fuel oil odor, with PID readings greater than 100 ppm at nine feet below grade. Approximately 1.5 yards of contaminated soil was removed from the excavation.
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An Expressway Investigation form was sent to VTDEC dated March 16, 2009, which indicated the need for further investigation at the site based on the contamination observed during the UST removal activities. Six-Geoprobe borings were completed at the site on March 17, 2009. All extracted soil samples were screened on site using a PID. Groundwater was encountered during the advancement of one of the borings and damp/saturated soils were encountered during the advancement of two other borings. Three one-inch diameter-monitoring wells were installed into the deeper soil borings to a depth of 8.1-10 feet below grade. No groundwater samples were collected on the day of drilling for laboratory analysis. Soil samples were collected from GP-1 and SB-3 during the installation of the soil borings. The locations of the monitoring wells and soil borings can be seen on the Figure 2: Site Map. General Site Description The Albro Estate is located at 102 Prouty Hill Road, Sunderland, VT (Figure 1: Site Location Map). One residential building and one two bay garage building are located on site. The former UST was positioned between the residential building and the septic tank as indicated in Figure 2: Site Map The properties surrounding the site are residential properties, and Prouty Hill Road is a quiet residential dead end street. Overhead electrical lines service the residential building. The property uses a private drinking water well and septic system. The drinking water well is located approximately 25 feet west of the residential building. The septic system is located between the former UST and Peters Brook. For more accurate locations see Figure 2, Site Map. Preliminary Activities Prior to field activities, HEA prepared a site-specific Health and Safety Plan in accordance with OSHA 29 Code of Federal Regulations 1910 and 1929. During the investigation, the plan was kept on-site and signed by all field staff. HEA walked the site prior to field activities and located the potential sampling locations. All subsurface utilities were marked-out prior to drilling through Vermont’s dig-safe services and the owner. Geoprobe Soil Boring/Monitoring Well Installation On March 17, 2009, HEA supervised the completion of six soil borings and three monitoring well installations at the site. The location of each of the soil borings and monitoring wells are depicted on Figure 2, Site Map. All borings (GP-1, 2, and 3, and SB-1, 2, and 3) were completed into the field around the site of the former UST. Drill logs were completed for each of the borings and can be found attached to this report. T+K drilling of Troy, NH installed the borings. A truck mounted Geoprobe drill rig was used for this project due to the position of the former tank cradle and the desired soil boring locations close to the septic tank and leach field.
Harper Environmental Associates April 1, 2009 Albro Estate, Sunderland, VT
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The monitoring wells were located in the following three positions: • GP-1, located approximately 5 feet west of the former UST cradle. • GP-2, located approximately 30 northwest of the former UST cradle. • GP-3, located into the tank cradle between the center and the easterly end of the
former UST. The soil borings were located in the following three positions:
• SB-1, located between GP-1 and GP-2, approximately 8-10 feet south of GP-2. • SB-2, located between GP-1 and GP-2, approximately 10 feet north west of GP-1 • SB-3, located approximately 30 feet northeast of GP-3, on the easterly side of the
chain link fence. During boring installation, continuous soil samples were collected using a 3-foot plastic lined sampler. All down hole drilling equipment was cleaned with water between holes. The soil samples were brought to the surface and visually classified by an engineer/geologist. All soil samples were screened in the field for volatile organic compounds (VOC) using a Mini Rae 2000 photoionization detector (PID). Field soil samples were collected in a sealed plastic bag or glass jars. The tip of the PID was inserted into the bag or jar to measure VOC content. Soils consisted of silty loam above sandy silts with pebbles, clay silts were detected between 3 and 6 feet below grade in GP-1 and GP-2. The site is located on a slope topographically gently sloping north towards Peters Brook. Refusal was encountered during the installation of the all six soil borings. The deepest boring extended to 10 feet below grade and the shallowest was installed to 5 feet below grade. Groundwater was detected in two of the three monitoring wells between 7.51 and 8.95 feet below grade. From visual interpretation of surface elevations, groundwater gradient would be expected to move in a northerly direction towards Peters Brook. Only two of the three monitoring wells contained water, consequently no groundwater gradient map could be generated. The two wells that contained groundwater, GP-2 and GP-3, had groundwater elevation of 89.95 and 89.9 feet respectively. One-inch PVC well screen + blank were installed into the three deepest boreholes. Sand was filled around the wells to an elevation above the top of the screen. Bentonte was used to seal a two-foot section of the borehole above the sand fill. Native fill was used to backfill the remainder of the well boring. A flush mounted road box was installed around each of the monitoring wells. Potential Receptors Identification of the potential receptors in proximity to the site was determined during this investigation. A relative degree of risk, from the contamination identified during this study, was assigned to each receptor. The potential receptors include groundwater, soil, surface water, indoor air, drinking water and subsurface utilities.
Harper Environmental Associates April 1, 2009 Albro Estate, Sunderland, VT
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Soil Soil screening data from the March, 2009 UST removal event indicated the presence of VOC’s in the soils beneath the former UST. The UST excavation extended to a depth of 9 feet below grade where PID readings were recorded greater than 100 ppm. Soils were screened using the PID during the installation of the soil borings on March 17, 2009. No PID readings were detected in any of the soil borings. Soil impacted by fuel oil-type hydrocarbons was not found in GP 1, 2, 3 or SB-1, 2, and 3. No visual indication of hydrocarbon impacts of soil was noted in any of the soil borings. Based on visual observation and PID measurements, the impacted soil zone appears to be concentrated proximate to the former LUST cradle and the bulk of the contaminated soils appear to have been removed during the soil excavation activities. Approximately 1.5 yards of soil was removed loaded directly onto a dump truck, for transportation to a treatment facility. High levels of petroleum-type hydrocarbon impact to soil represent a potential threat to human and environmental receptors including nearby buildings, children playing in the vicinity, and utility corridors. The routes of exposure would include direct contact during excavation, vapors emanating from uncovered soil and vapors entering utility corridors and basements. Since soil contamination was encountered well below the ground surface, exposure to humans through direct contact with soil is minimized. There is a potential risk of exposure to workers who may excavate the soil and have direct contact with the soil or breath vapors emanating from uncovered soil. Soil Analytical Results Two soil samples were collected during the completion of the soil borings and sent for laboratory analysis. One soil sample from GP-1, collected from 7 feet below grade, was analyzed for volatile organic compounds (VOC’s) and total petroleum hydrocarbons (TPH’s). The second soil sample was collected from SB-3, at 6 feet below grade, was analyzed for TPH only. No soil sample contained petroleum hydrocarbon contamination above the respective detection limits. Groundwater Groundwater was observed in two of the three monitoring wells during the groundwater sampling event. No groundwater was detected during the UST closure activities. A groundwater gradient map was not produced due to only two depth to water readings being available. Topographic slope and the position of Peters Brook suggests that groundwater would likely from in a northerly direction. Groundwater samples were collected from the two monitoring wells that contained water (GP-2 and GP-3) on March 20, 2009. The groundwater samples were analyzed for volatile organic compounds (VOC’s) using EPA Method 8021/8260. Not enough water could be collected for TPH analysis. No level of groundwater contamination was detected in any of the groundwater samples, consequently exposure from groundwater is minimal.
Harper Environmental Associates April 1, 2009 Albro Estate, Sunderland, VT
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Attachments: Figure 1: Site Location Map Figure 2: Site Map Appendix: Well Logs Photos
Phoenix Environmental Laboratory Report Expressway Notification Form Limitations
Harper Environmental Associates April 1, 2009 Albro Estate, Sunderland, VT
Sample Information Custody Information
Matrix:Location Code:
Rush Request:
P.O.#:
Collected by:Received by:
Analyzed by:
DRINKING WATER
HARPER
03/12/09
LDF
see "By" below
AW
Laboratory DataClient ID: SUNDERLAND LUST TAP
Phoenix I.D.: AR45698
03/17/09
0:00
10:30
Parameter Result RL Units Date By Reference
FOR: Attn: Mr. Cliff HarperHarper Environmental Associates1811 Hale Hollow RdBridgewater Corners, VT 05035