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Home My WebLink AboutMO-29991_49076_CA_UST-61_20230425 100 East Ruffin Street · Mebane, North Carolina 27302 Telephone (919) 563-9091 · Facsimile (919) 563-9095 www.terraquestpc.com April 25, 2023 Trudy Beverly NCDEQ DWM-UST Section Morrisville Regional Office 610 East Center Avenue, Suite 301 Mooresville, NC 28115 Re: UST Closure Summary Letter Marilyn E. Ryan Heirs 541 Hedrick Dr. Statesville, NC 28677 Dear Mrs. Beverly: Terraquest Environmental Consultants, P.C. (Terraquest) has supervised the excavation and permanent closure of a heating oil underground storage tank (UST) formerly located at the Marilyn E. Ryan Heirs property at 541 Hedrick Dr. in Statesville, Iredell County, NC (subject property). The purpose of this letter is to document the UST closure activities performed at the residence by Terraquest. The location of the property is depicted in the attached Figure 1. On April 6, 2023, Terraquest personnel supervised the closure of the UST by excavation. The steel UST was located off the east side of the residence approximately 2 feet from the building’s foundation and was buried approximately 16 inches below ground level (BGL). The UST dimensions were 46 inches in diameter by 76 inches long for an approximate capacity of 550 gallons. The former UST formerly supplied heating oil to the residence’s furnaces. Given the size and former uses of the UST, the UST is considered non-commercial and non-regulated. The UST had approximately 6 inches of residual liquid. Prior to the excavation, Herr, LLC of Thomasville, NC vacuumed out the UST and hauled the residual liquid offsite for proper disposal. A copy of the liquid waste manifest is attached. Pictures of the UST before and during removal are attached. During the excavation, sandy lean clay was encountered surrounding the UST down to a depth of 7 feet BGL. A soil sample (BE1) was collected from beneath the UST at a depth of 6.5 to 7.0 feet BGL on April 6, 2023. The soil sample was screened using a photoionization detector (PID) and revealed the presence of heating-oil type contaminants with a detected measurement of 287 parts per million (ppm). This screening measurement coupled with the stained soil surrounding the UST and noted holes in the UST indicates a release of heating oil had occurred from the UST. The BE1 soil sample collected for analysis was placed in the proper laboratory-prepared sampling containers, labeled with the project name, project number, sample identification, required analysis, and date and time of collection. The sample was analyzed for heating oil-type contaminants by a UVF Trilogy unit for TPH Diesel-Range Organics (DRO) and Gasoline-Range Organics (GRO). Marilyn E. Ryan Heirs 541 Hedrick Dr. Statesville, NC April 25, 2023 Page 2 Analytical results of the BE1(6.5-7.0) soil sample revealed contaminant concentrations above the North Carolina Department of Environmental Quality Division of Waste Management UST Section (NCDEQ DWM-UST) Actions Limits for both the TPH GRO {50 milligrams/kilogram (mg/kg)} and TPH DRO (100 mg/kg) methods. No groundwater was encountered during the UST excavation. The attached Table 1 summarizes the sample depth and detected concentrations of the BE1 soil sample. The locations of the BE soil sample and UST are depicted in the attached Figure 2. A copy of the UST-61 24-Hour Release and UST Leak Reporting Form is attached. The soil analytical report is attached. Water Supply Well Inspection & Surface Water Bodies After the removal of the UST and the discovery of a release incident, Terraquest inspected the subject and surrounding properties within a 150-ft. radius of the former UST. No water supply wells were identified on the subject or surrounding properties. An intermittent stream was noted within a 150-ft. radius along the southern subject property boundary. Flowing water was present during the site visit. Conclusions The following conclusions can be made after a review of the soil data collected during the April 6, 2023 UST closure event: • The BE1 soil TPH GRO and DRO results reveal the presence of heating oil-type concentrations above the NCDEQ DWM-UST Action Limit of 50 mg/kg and 100 mg/kg, respectively. • Given the non-commercial classification of the UST, further cleanup or assessment of the release incidents is not necessary given the absence of water supply wells within a 150- ft. radius of the USTs. • A Notice of Residual Petroleum (NRP) will need to be completed for the property prior to the closure of the release incident. • Once an the NRP and public notification are completed, the release incident will be eligible for closure. If you have any questions regarding this letter, please call me at (919) 563-9091 (office) and (919) 906-0707 (mobile). Marilyn E. Ryan Heirs 541 Hedrick Dr. Statesville, NC April 25, 2023 Page 3 Sincerely, TERRAQUEST ENVIRONMENTAL CONSULTANTS, P.C. Jonathan R. Grubbs, P.G. Vice President Attachments: Table 1: Summary of Soil Sampling Results Figure 1: Site Location Map Figure 2: Site Layout and UST Location Map Liquid Waste Manifest Pictures of UST Excavation UST-61 24-Hour Release and UST Leak Reporting Form Analytical Report Table 1 Date: 4/7/23 TP H 3 5 5 0 TP H 5 0 3 0 Date Collected (ppm)Sample Depth 12,300 204 Bold Analytical Method Sample ID TP H D R O TP H G R O ONSULTANTS, P.C.CENVIRONMENTAL 541 Hedrick Dr. Statesville, NC Picture 1: Location of 550-gallon heating oil UST prior to removal at 541 Hedrick Dr. in Statesville, NC Picture 2: Fill and vent port of uncovered 550-gallon heating oil Picture 3: Former 550-gallon heating oil UST with noted holes Picture 4: Former 550-gallon heating oil UST with noted holes UST-61 24-Hour Release and UST Leak Reporting Form. For Releases in NC This form should be completed and submitted to the UST Section’s regional office following a known or suspected release from an underground storage tank (UST) system. This form is required to be submitted within 24 hours of discovery of a known or suspected release (DWM USE ONLY) Incident # ________ Risk (H,I,L,U)_______ Received On ________ Received By ________ Reported by (circle one): Phone, Fax or Report Region _______ Suspected Contamination? (Y/N) ________ Confirmed GW Contamination? (Y/N) ______ Confirmed Soil Contamination ?(Y/N) ______ Samples Taken?(Y/N) ______ Free Product? (Y/N) _____ If Yes, State Greatest Thickness ______________ Facility ID Number ______________ Date Leak Discovered ___________ Comm/Non-Commercial? ________ Reg/Non-regulated? _____________ INCIDENT DESCRIPTION Incident Name: Address: County: City/Town: Zip Code: Regional Office (circle one): Asheville, Mooresville, Fayetteville, Raleigh, Washington, Wilmington, Winston-Salem Latitude (decimal degrees): Longitude (decimal degrees) : Obtained by: Briefly describe suspected or confirmed release: (including but not limited to: nature of release, date of release, amount of release, amount of free product present and recover efforts, initial responses conducted, impacts to receptors GPS Topographic map GIS Address matching Other Unknown Describe location: HOW RELEASE WAS DISCOVERED (Release Code) (Check one) Release Detection Equipment or Methods During UST Closure/Removal Property Transfer Visual/Odor Water in Tank Water Supply Well Contamination Groundwater Contamination Surface Water Contamination Other (specify) _______________ SOURCE OF CONTAMINATION Source of Release (Check primary source) Cause of Release (Check primary cause) Type of Release (Check one) Product Type Released (Check primary product type released) Tank Piping Dispenser Submersible Turbine Pump Delivery Problem Spill Bucket Other Unknown Definitions presented on reverse Spill Overfill Corrosion Physical/Mechanical Damage Install Problem Other Unknown Definitions presented on reverse Petroleum Non-Petroleum Both Location (Check one) Facility Residence Other Gasoline/ Diesel/ Kerosene Heating Oil Other Petroleum Products Metals Other Inorganics Other Organics Diesel/Veg. Oil Blend Vegetable Oil 100% E10 – E20 E21 – E84 E85 – E99 Ethanol 100% E01 – E09 Ownership 1. Municipal 2. Military 3. Unknown 4. Private 5. Federal 6. County 7. State Operation Type 1. Public Service 2. Agricultural 3. Residential 4. Education/Relig. 5. Industrial 6. Commercial 7. Mining UST Form 61 (02/19) Page 1 of 2 Non-regulated Not Applicable Mecklenburg x Residence x x x x x N N Y N Y Non-Commercial pril 6, 2023 (Lab) Marilyn E. Ryan Heirs Property 541 Hedrick Dr. Statesville 28677 -80.9125451 W35.7948925 N soil sample collected from beneath a residential 550-gallon heating oil UST. Analytical results of the soil samples revealed TPH DRO & TPH GRO concentrations greater than the NCDEQ Action Limits. The date and amount of the release is unknown. The residence is connected to municipal water. x IMPACT ON DRINKING WATER SUPPLIES Water Supply Wells Affected? 1. Yes 2. No 3. Unknown Number of Water Supply Wells Affected __________________ Water Supply Wells Contaminated: (Include Users Names, Addresses and Phone Numbers. Attach additional sheet if necessary) 1. 2. 3. UST SYSTEM OWNER UST Owner/Company Point of Contact Address City State Zip Code Telephone Number UST SYSTEM OPERATOR UST Operator/Company Address City State Zip Code Telephone Number LANDOWNER AT LOCATION OF UST INCIDENT Landowner Address City State Zip Code Telephone Number Draw Sketch of Area (showing two major road intersections) or Attach Map Person Reporting Incident Company Telephone Number Title Address Date UST Form 61 02/19 Pa e 2 of 2 Definitions of Sources Tank: means the tank that stores the product and is part of the underground storage tank system Piping: means the piping and connectors running from the tank or submersible turbine pump to the dispenser or other end-use equipment (Vent, vapor recovery, or fill lines are excluded.) Dispenser: includes the dispenser and the equipment used to connect the dispenser to the piping (e.g., a release from a suction pump or from components located above the shear valve) Submersible Turbine Pump (STP) Area includes the submersible turbine pump head (typically located in the tank sump), the line leak detector, and the piping that connects the submersible turbine pump to the tank Delivery Problem: identifies releases that occurred during product delivery to the tank. (Typical causes associated with this source are spills and overfills.) Other: serves as the option to use when the release source is known but does not fit into one of the preceding categories (e.g., for releases from vent lines, vapor recovery lines, and fill lines) Unknown: identifies releases for which the source has not been determined Definitions of Causes Spill: use this cause when a spill occurs (e.g., when the delivery hose is disconnected from the tank fill pipe or when the nozzle is removed from the dispenser) Overfill: use when an overfill occurs (e.g., overfills may occur from the fill pipe at the tank or when the nozzle fails to shut off at the dispenser) Physical or Mechanical Damage: use for all types of physical or mechanical damage, except corrosion (e.g., puncture of tank or piping, loose fittings, broken components, and components that have changed dimension) Corrosion: use when a metal tank, piping, or other component has a release due to corrosion (e.g., for steel, corrosion takes the form of rust) Installation Problem: use when the problem is determined to have occurred specifically because the UST system was not installed properly Other: use this option when the cause is known but does not fit into one of the preceding categories (e.g., putting regulated substances into monitoring wells) Unknown: use when the cause has not been determined Jamie Braswell Same as above Same as above See attached figures Jonathan R. Grubbs Terraquest Environmental Consultants, P.C.919-563-9091 100 E. Ruffin St., Mebane, NC 27302V. President Marilyn E. Ryan Heirs Statesville NC 28677 704-437-8519 541 Hedrick Dr. 4/24/23 ONSULTANTS, P.C.CENVIRONMENTAL UVF TRILOGY ANALYTICAL REPORT Project Name: 541 Hedrick Dr Statesville, NC Project Number: 04023 Date: 4/7/2023 Standard Technical Procedures The UVF TRILOGY instrument is a fixed-wavelength fluorometer but uses deep UV LEDS to detect monoaromatic and polyaromatic hydrocarbons. SITELAB’s CAL-025 GRO Module is used to detect volatile petroleum hydrocarbons in the C6 to C10 range. This test matches well to EPA Methods for GRO, BTEX, BPH or VOC’s using GC/FID instrumentation. SITELAB’s CAL-042 EDRO Module is used to detect petroleum hydrocarbons in the C10 to C36 diesel and oil range. This test matches well to EPA methods for TPH, EPH, DRO, and others using GC-FID instrumentation. Prior to field usage, the UVF TRILOGY is calibrated with five calibration standard solutions per targeted analyte. Soil samples are weighed to the nearest gram (i.e. 5.0 g) and added to a 1-ounce HDPE Nalgene bottle with a measured amount of laboratory grade methanol to the nearest mL (i.e. 10 mL) to create a sample extract. After addition of both the soil and methanol, the bottle is agitated for several minutes. Next, the sample rests for several minutes allowing for the soil and methanol extract to separate. After ample resting time, the methanol extract is collected with a syringe. A filter is connected to the end of the syringe and dispensed into a clean sample test tube. The test tube is labeled with sample ID and extract dilution factor (i.e. 2X). Known amounts of extract are pipetted into a second test tube and diluted with methanol. The sample ID and dilution factor are labeled on the test tube (i.e. 100X). Samples are placed into a clean cuvette and carefully inserted into the selected UV Module. Prior to analyzing the sample, the stored calibration that matches the UV Module being used, is selected. The UVF TRILOGY produces a result that when multiplied to the dilution factor equals the true TPH value. Quenching occurs when the detector is swamped by too many or certain type of hydrocarbons, producing low or negative concentrations. The sample is tested at multiple dilutions to confirm the results are linear and accurate. Solvent blank samples are periodically analyzed to confirm the solvent is clean and the calibration of the machine is maintained. UVF Analytical Report Project Name 541 Hedrick Dr Project Number 04023 Method UVF Trilogy Sample Name Sample Depth Sample Date Analyte Name Dilution Result MDL Units BE1 6.5-7 4/6/2023 DRO 10000 12300 1000 mg/kg BE1 6.5-7 4/6/2023 GRO 100 204 50 mg/kg Friday, April 7, 2023 Page 1 of 2 Project Name 541 Hedrick Dr Project Number 04023 Method UVF Trilogy Sample Name Sample Depth Sample Date Analyte Name Dilution Result MDL Units BE2 6.5-7 4/6/2023 DRO 10000 10200 1000 mg/kg BE2 6.5-7 4/6/2023 GRO 100 231 50 mg/kg Friday, April 7, 2023 Page 2 of 2