The URL can be used to link to this page

Home My WebLink AboutAS-3731_28861_CA_FPR_20230413 MARCH 2023 FREE PRODUCT RECOVERY REPORT for the ONE STOP #15 146 Wiggins Road Candler, Buncombe County, North Carolina Incident #28861 PREPARED FOR: Samir Enterprises, LLC. PO Box 1272 Old Fort, NC 28762 PREPARED BY: Singleton Environmental, Inc. PO Box 604 Fletcher, NC 28732 (828) 667-5001 SEI Project # SEI-1302 April 14, 2023 Singleton Environmental, Inc. Free Product Recovery Report One Stop #15 Candler, North Carolina 1 FREE PRODUCT RECOVERY REPORT April 14, 2023 Incident Number: 28861 Site Name: One Stop #15 146 Wiggins Road Candler, NC 28715 Incident Number: 28861 Facility ID Number: 0-0021101 UST Responsible Party: Samir Enterprises, LLC. PO Box 1272 Old Fort, NC 28762 Consultant / Contractor: Singleton Environmental, Inc. PO Box 604 Fletcher, NC 28732 Telephone: (828) 508-4510 Date Release Discovered: June 6, 2012 Estimated Quantity of Release: Unknown/unquantified Cause/Source of Release: Dispenser Islands Latitude: 35.5432° North Longitude: -82.7530° West Signature and Seal of Certifying Professional Engineer: I, Christopher D. Singleton, a North Carolina Professional Geologist, do certify that the information contained in this report is correct and accurate to the best of my knowledge. ____________________________________ Christopher D. Singleton, P.G. #1928 Singleton Environmental, Inc. is licensed to practice geology in North Carolina. The certification number of the company is C-443. Free Product Recovery Report One Stop #15 Candler, North Carolina 2 Table of Contents Introduction…..................…………..............................................................................................1 Site Status …..................…………......................................... ......................................................1 Type and Thickness of Free Product …......................…………......................................... ....1 Rate of Return of Free Product ……......................................... .............................................1 Method of Free Product Recovery and Justification .......…………......................................... 1 Total Amount of Free Product Recovered to Date.........…………......................................... .2 Costs Associated with Free Product Recovery...............…………......................................... .2 Conclusions and Recommendations ……......................................... ......................................2 Tables Table 1. Free-Product Thickness Table Figures Figure 1. Site Location Map Figure 2. Site Map Figure 3. Groundwater Flow Direction around MW-1 Map Figure 4. Free-Product Map Appendices Appendix A: Piezometer Logs Free Product Recovery Report One Stop #15 Candler, North Carolina 3 Introduction This report presents information on free-product assessment activities conducted at One Stop #15 (see Figure 1 for site location) located at 146 Wiggins Road in Candler, North Carolina in March 2023, and April 2023. Four piezometers were installed around monitoring well MW-1 to delineate the horizontal boundary of the free-product on March 27, 2023, and they were gauged and surveyed on April 7, 2023. Type and Thickness of Free Product Free-phase petroleum (0.59 feet) was detected in monitoring well MW-1 on March 11, 2016, during the Comprehensive Site Assessment (CSA) groundwater sampling activities. Historically, the product thickness measured in MW-1 has ranged from 0.25 feet to in excess of 4 feet. On March 27, 2023, four piezometers (PZ-1, PZ-2, PZ-3, and PZ-4) were installed surrounding MW-1 (Figure 2). On April 7, 2023, the product levels were checked in MW-1 and PZ-1 through PZ-4. The product thickness detected in MW-1 was 0.59 feet. The product thickness detected in PZ-1 was 0.05 feet. Free-product was not detected in piezometers PZ-2, PZ-3 and PZ-4. Each piezometer (PZ-1 through PZ-4) was installed to a depth of 30 ft/bls. All four piezometers were installed with 15 feet of screen and 15 feet of casing. The boring logs are located in Appendix A. Once the product levels were checked, each well was surveyed based on the elevation of MW-1 to establish a localized groundwater flow direction in the immediate vicinity of MW-1. The localized groundwater flow direction is to the southeast (Figure 3). The free-product is creating a depression in the water table in the localized area. Table 1 lists the product thicknesses measured in monitoring wells at the site during the April 7, 2023, product gauging event. Rate of Return of Free Product The rate of return of product in each well was calculated by taking the thickness after 8 hours and dividing by 8 hours giving the rate of return in inches per hour. The rate of return for product in MW-1 was previously measured at 0.34 inches/hour when the product thickness exceeded 4 feet. The rate of return for product in PZ-1 has not been measured to date given the low amount measured on April 7, 2023. Method of Free Product Recovery and Justification No free-product was removed during this event. Free Product Recovery Report One Stop #15 Candler, North Carolina 4 Total Amount of Free Product Recovered to Date To date, approximately 91.75 gallons of free-product (product and vapor) have been recovered during previous MMPE and AFVR events since free-product recovery began in 2019. Costs Associated with Free Product Recovery The total cost of the product recovery events to date is $38,355.65. This amount, divided by the total amount of liquid recovered to date (91.75 gallons) is $418.05 per gallon of free-product recovered. Conclusions and Recommendations Free-product keeps returning in monitoring wells MW-1 and is now present in PZ-1. A total of 91.75 gallons of free-product has been removed since 2019. The unit cost per gallon of product recovered during these events was $418.05 per gallon. Based on this information, mechanical free-product removal has been successful since the original product levels exceeded 4 feet in thickness to the current 0.59 feet. Currently, Samir Enterprises, LLC. is planning on replacing the UST system located at the site. During the UST removal activities contaminated soil will be removed from the Dispenser 1/MW-1 location; therefore, SEI recommends excavating as much soil that is possible from this location in an attempt to remove petroleum saturated soils causing the free-product levels in the groundwater. SEI also recommends reinstalling monitoring well MW-1 and replacing PZ-1 with a 2-inch monitoring well that can also serve as a recovery well if AFVR or MMPE events are reinstated. TABLES MW Number Top of Casing Elevation Top of Casing to Free Product (ft) Top of Casing to GW Depth (ft)Groundwater Elevation (ft) MW-1 98.69 21.87 (0.59 Ft)22.46 76.23 PZ-1 98.30 21.85 (0.05 Ft)21.90 76.40 PZ-2 97.81 ND 21.06 76.75 PZ-3 98.90 ND 21.60 77.30 PZ-4 99.57 ND 21.84 77.73 ND = No Free-Product Detected Table 1 Groundwater Free-Product Levels (April 7, 2023) One Stop #15 Candler, NC UST Incident # 28861 146 Wiggins Road FIGURES CANTON QUADRANGLE NORTH CAROLINA 7.5 MINUTE SERIES (TOPOGRAPHIC) Figure 1 Site Map One Stop #15 – Candler, NC One Stop #15 Singleton Environmental, Inc MW-1SB-3/MW-3SB-2/MW-2Current USTsSB-4/MW-4One Stop #15WSW-1SB-5/MW-5SB-6/MW-6SB-7/MW-7SB-8/MW-8SB-9/MW-9PZ-1PZ-2PZ-3PZ-4 Singleton Environmental, Inc MW-1/76.23'SB-3/MW-3SB-2/MW-2Current USTsSB-4/MW-4One Stop #15WSW-1SB-5/MW-5SB-6/MW-6SB-7/MW-7SB-8/MW-8SB-9/MW-9PZ-1/76.40'PZ-2/76.75PZ-3/77.30'PZ-4/77.73'76'77'78' Singleton Environmental, Inc MW-1SB-3/MW-3SB-2/MW-2Current USTsSB-4/MW-4One Stop #15WSW-1SB-5/MW-5SB-6/MW-6SB-7/MW-7SB-8/MW-8SB-9/MW-9PZ-1PZ-2PZ-3PZ-4Free-Product APPENDIX A PROJECT NUMBER BORING NUMBERPZ-1 SHEET 1 OF 1 SOIL BORING LOG PROJECT :One Stop #15 LOCATION :Candler, NC ELEVATION :N/A DRILLING CONTRACTOR 3D Env Investigations, Inc. DRILLING METHOD AND EQUIPMENT USED :Geoprobe WATER LEVEL :21.9 DATE:3/27/2023 LOGGER : Chris Singleton DEPTH BELOW SURFACE (FT)DESCRIPTION COMMENTS INTERVAL (FT)PID RECOVERY (IN)TEST SOIL NAME, USCS GROUP SYMBOL, COLOR, DEPTH OF CASING, DRILLING RATE, #/TYPE RESULTS MOISTURE CONTENT, RELATIVE DENSITY, DRILLING FLUID LOSS, OR CONSISTENCY, SOIL STRUCTURE, TESTS, AND INSTRUMENTATION. MINERALOGY. _0.0 to 1.0 feet: Asphalt & Gravel _Concrete 0-4 Casing 0-15 ft._ _1.0 to 9 feet: Red Clayey Silt __ __1 inch casing _ _115 __ 5 ______ __Bent. 4-13 ft._ ___ ___ _427 __ 10 __9.0 to 21 feet: Orange Clayey Silt ____ ___ ___ __Sand 13-30 _ _502 __ 15 ______ _screen 15-30 _ _225 _1 inch screen _ ___ ___ 20 __623 ____ ___ _21 to 24 feet: Brown Clayey Silty Sand _GW _ ___ ___ 25 __24 to 30 feet: Saprolite __ __ ___ ___ ___ 30 ______ _Well set at 30 feet.__ ___ ___ ___ 35 ______ ___ ___ ___ ___ 40 ______ __ __ __ _ SEI-1302 PZ-1 Boring Log PROJECT NUMBER BORING NUMBERPZ-2 SHEET 1 OF 1 SOIL BORING LOG PROJECT :One Stop #15 LOCATION :Candler, NC ELEVATION :N/A DRILLING CONTRACTOR 3D Env Investigations, Inc. DRILLING METHOD AND EQUIPMENT USED :Geoprobe WATER LEVEL :21.06 DATE:3/27/2023 LOGGER : Chris Singleton DEPTH BELOW SURFACE (FT)DESCRIPTION COMMENTS INTERVAL (FT)PID RECOVERY (IN)TEST SOIL NAME, USCS GROUP SYMBOL, COLOR, DEPTH OF CASING, DRILLING RATE, #/TYPE RESULTS MOISTURE CONTENT, RELATIVE DENSITY, DRILLING FLUID LOSS, OR CONSISTENCY, SOIL STRUCTURE, TESTS, AND INSTRUMENTATION. MINERALOGY. _0.0 to 1.0 feet: Asphalt & Gravel _Concrete 0-4 Casing 0-15 ft._ _1.0 to 6 feet: Black Clayey Silt __ __1 inch casing _ _10.2 __ 5 ______ __Bent. 4-13 ft._ _6 to 8 feet: Red Clayey Silt __ _8.3 __ _8 to 19 feet: Orange Clayey Silt w/gravel __ 10 ______ _5.7 __ ___ __Sand 13-30 _ _21 __ 15 ______ _115 screen 15-30 _ __1 inch screen _ ___ ___ 20 __83 19 to 30 feet: Brown Saprolite ____ ___ __GW _ ___ ___ 25 ____ __ ___ ___ ___ 30 ______ _Well set at 30 feet.__ ___ ___ ___ 35 ______ ___ ___ ___ ___ 40 ______ __ __ __ _ SEI-1302 PZ-2 Boring Log PROJECT NUMBER BORING NUMBERPZ-3 SHEET 1 OF 1 SOIL BORING LOG PROJECT :One Stop #15 LOCATION :Candler, NC ELEVATION :N/A DRILLING CONTRACTOR 3D Env Investigations, Inc. DRILLING METHOD AND EQUIPMENT USED :Geoprobe WATER LEVEL :21.6 DATE:3/27/2023 LOGGER : Chris Singleton DEPTH BELOW SURFACE (FT)DESCRIPTION COMMENTS INTERVAL (FT)PID RECOVERY (IN)TEST SOIL NAME, USCS GROUP SYMBOL, COLOR, DEPTH OF CASING, DRILLING RATE, #/TYPE RESULTS MOISTURE CONTENT, RELATIVE DENSITY, DRILLING FLUID LOSS, OR CONSISTENCY, SOIL STRUCTURE, TESTS, AND INSTRUMENTATION. MINERALOGY. _0.0 to 1.0 feet: Concrete & Gravel _Concrete 0-4 Casing 0-15 ft._ _1.0 to 9 feet: Red Clayey Silt __ __1 inch casing _ _24 __ 5 ______ __Bent. 4-13 ft._ ___ _73 __ ___ 10 __9 to 16 feet: Orange sandy clayey silt ____ _102 __ ___ _6.9 _Sand 13-30 _ ___ 15 ______ _8.3 screen 15-30 _ _16 to 30 feet: Orange/Brown Saprolite _1 inch screen _ ___ _10.2 __ 20 ______ ___ __GW _ ___ ___ 25 ____ __ ___ ___ ___ 30 ______ _Well set at 30 feet.__ ___ ___ ___ 35 ______ ___ ___ ___ ___ 40 ______ __ __ __ _ SEI-1302 PZ-3 Boring Log PROJECT NUMBER BORING NUMBERPZ-4 SHEET 1 OF 1 SOIL BORING LOG PROJECT :One Stop #15 LOCATION :Candler, NC ELEVATION :N/A DRILLING CONTRACTOR 3D Env Investigations, Inc. DRILLING METHOD AND EQUIPMENT USED :Geoprobe WATER LEVEL :21.84 DATE:3/27/2023 LOGGER : Chris Singleton DEPTH BELOW SURFACE (FT)DESCRIPTION COMMENTS INTERVAL (FT)PID RECOVERY (IN)TEST SOIL NAME, USCS GROUP SYMBOL, COLOR, DEPTH OF CASING, DRILLING RATE, #/TYPE RESULTS MOISTURE CONTENT, RELATIVE DENSITY, DRILLING FLUID LOSS, OR CONSISTENCY, SOIL STRUCTURE, TESTS, AND INSTRUMENTATION. MINERALOGY. _0.0 to 1.0 feet: Concrete & Gravel _Concrete 0-4 Casing 0-15 ft._ _1.0 to 14 feet: Brown Clayey Silt w/ gravel __ __1 inch casing _ _2.3 __ 5 ______ __Bent. 4-13 ft._ ___ _5.8 __ ___ 10 __6.2 ____ ___ _3.1 __ __Sand 13-30 _ ___ 15 __14 to 30 feet: Orange Saprolite ____ _1.9 screen 15-30 _ __1 inch screen _ ___ _6.1 __ 20 ______ ___ __GW _ ___ ___ 25 ____ __ ___ ___ ___ 30 ______ _Well set at 30 feet.__ ___ ___ ___ 35 ______ ___ ___ ___ ___ 40 ______ __ __ __ _ SEI-1302 PZ-4 Boring Log