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Home My WebLink AboutSoil Stockpile Visual and PLM Analysis Results_20190304�.S DUKE ENERGY. March 04, 2019 North Carolina Department of Environmental Quality Division of Waste Management 217 W Jones Street Raleigh, NC 27603 Attn: Ms. Elizabeth Werner Re: Duke Energy Carolinas — Riverbend Steam Station, Gaston County Soil Stockpile Visual and PLM Analysis Dear Ms. Werner, 526 South Church St. Charlotte, NC 28202 P.O. Box 1006 Mail Code EC13K Charlotte, NC 28201-1006 In an email dated 02/01/2019, NCDEQ DWM approved the reuse of soil (to be reused within the designated waste boundary) that was stockpiled in the ash stack area of Riverbend Steam Station on the conditions that that it passed visual inspection and PLM analysis came back to be less than 50% ash. The attached document (Table 1) provides the PLM results of the soil that passed visual inspection. Of the material that passed visual inspection, 44 soil samples were collected and PLM analysis confirmed that the material contained less than 50% ash. The visual inspection and collection of the 44 soil samples were obtained through the following process: Step 1: The soil stockpiles in the ash stack were divided into more manageable rows. Step 2: Each row was spread out by an excavator in sections to a depth of approximately 1.5'-2.5' and bucket teeth created additional rows in this material for visual inspection to take place. Step 3: Wood Group visually inspected for ash. If the material passed visual inspection, representative samples were collected for PLM analysis (44 samples total). The material that did not pass visual inspection was removed and transported offsite. Step 4: Once a row passed visual inspection and PLM samples were collected, it was moved to a new location and labeled/designated in the case that it did not pass PLM analysis and had to be removed and transported offsite. Duke Energy plans to reuse the soil that passed visual inspection and PLM analysis for final countouring within the ash basins/ash stack footprint. This information is only being submitted electronically. If you have any questions pertaining to these results, please contact Bristol Grohol and bristol.grohol@duke-energy.com. Respectfully submitted, / � 0" 4, � Bristol Grohol, EIT Waste and Groundwater Programs Attachments: Table 1: Riverbend Steam Station Soil Stockpiles in Ash Stack — Visual Classification and PLM Results cc (via e-mail): Eric Smith, NCDEQ Steve Lanter, NCDEQ Larry Frost, NCDEQ Ed Mussler, NCDEQ Benjamin Jackson, NCDEQ David Giachin, NCDEQ Chris Varner, Duke Energy Ed Sullivan, Duke Energy Riverbend Ash Basin Closure Ash Stack Soil Stockpile Sampling - Field Log Project 7810150536 Table 1: Riverbend Steam Station Soil Stockpiles in Ash Stack - Visual Classification and PLM Results Sample ID Soil Stockpile Date Sampled or Resampled Sampled By Visual Classification PLM Result (Area % Fly Ash) Duke Lab PLM Sample No. SS01 A 2/1/2019 S.Brewer Dark brown silty clay 17% 2019003178 SS02 A 2/4/2019 V. Ojaruega Dark brown and red silty clay 12% 2019003355 SS03 A 2/4/2019 V. Ojaruega red brown and tan clay 21% 2019003356 SS04 A 2/4/2019 V. Ojaruega Dark brown silty clay 16% 2019003357 SS05 B 2/5/2019 V. Ojaruega Dark brown silt 12% 2019003708 SS06 B 2/5/2019 V. Ojaruega Dark brown silty clay 7% 2019003709 SS07 B 2/5/2019 V. Ojaruega Dark brown and grey silty clay 9% 2019003710 SS08 C 2/5/2019 V. Ojaruega Dark brown and red clay 7% 2019003711 SS09 C 2/5/2019 V. Ojaruega Dark brown silty clay 14% 2019003712 SS10 C 2/5/2019 V. Ojaruega Dark brown silty clay 8% 2019003713 SS11 D 2/6/2019 A. Cottingham Red Brown Sandy Silt 9% 2019004118 SS12 D 2/6/2019 A. Cottingham Red Brown Sandy Silt 3% 2019004119 SS13 D 2/6/2019 A. Cottingham Red Brown Sandy Silt 8% 2019004120 SS14 E 2/6/2019 A. Cottingham Red Brown Sandy Silt 6% 2019004121 SS15 E 2/6/2019 A. Cottingham Red Brown Sandy Silt 2% 2019004122 SS16 E 2/6/2019 A. Cottingham Red Brown Sandy Silt 5% 2019004123 SS17 F 2/7/2019 A. Cottingham Red Brown Sandy Silt 4% 201900218 SS18 F 2/7/2019 A. Cottingham Red Brown Sandy Silt 9% 201900219 SS19 F 2/7/2019 A. Cottingham Red Brown Sandy Silt 8% 201900220 SS20 F 2/7/2019 A. Cottingham Red Brown Sandy Silt 5% 201900221 SS21 G 2/7/2019 A. Cottingham Red Brown Sandy Silt 4% 201900222 SS22 G 2/7/2019 A. Cottingham Red Brown Sandy Silt 6% 201900223 SS23 G 2/7/2019 A. Cottingham Red Brown Sandy Silt 6% 201900224 SS24 H 2/7/2019 A. Cottingham Red Brown Sandy Silt 4% 201900225 SS25 H 2/7/2019 A. Cottingham Red Brown Sandy Silt 5% 201900226 SS26 H 2/7/2019 A. Cottingham Red Brown Sandy Silt 8% 201900227 SS27 1 2/7/2019 A. Cottingham Red Brown Sandy Silt 6% 201900228 SS28 1 2/7/2019 A. Cottingham Red Brown Sandy Silt 6% 201900229 SS29 1 2/7/2019 A. Cottingham Red Brown Sandy Silt 5% 201900230 SS30 J 2/8/2019 D. Jones Dark Brown Silt 5% 2019004205 SS31 J 2/8/2019 D. Jones Dark Brown Silt 10% 2019004206 SS32 1 2/8/2019 D. Jones Dark Brown Silt 10% 2019004207 5533 K 2/8/2019 D. Jones Dark Brown Silt 12% 2019004208 SS34 K 2/8/2019 D. Jones Dark Brown Silt 15% 2019004209 SS35 K 2/8/2019 D. Jones Dark Brown Silt 9% 2019004210 SS36 L 2/9/2019 D. Jones Dark Brown Silt 8% 2019004211 SS37 L 2/9/2019 D. Jones Dark Brown Silt 5% 2019004212 SS38 L 2/9/2019 D. Jones Dark Brown Silt 4% 2019004213 SS39 M 2/11/2019 D. Jones Red and Brown Silt 3% 2019004413 SS40 M 2/11/2019 D. Jones Red and Brown Silt 4% 2019004414 SS41 M 2/11/2019 D. Jones Red and Brown Silt 2% 2019004415 SS42 N 2/11/2019 D. Jones Red and Brown Silt 13% 2019004416 SS43 N 2/11/2019 D. Jones Red and Brown Silt 13% 2019004417 SS44 N 2/11/2019 D. Jones Red and Brown Silt 16% 2019004418