September 3, 2013 Via

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2 September 3, 2013 Via Mr. Bill Sadler, PG Geology Supervisor Solid Waste Management Division Arkansas Department of Environmental Quality 5301 Northshore Drive North Little Rock, AR RE: Groundwater Well Installation Report Entergy Class 3N Landfill Permit No S3N-R1, AFIN: FTN No. R Dear Mr. Sadler: On behalf of Entergy Arkansas, Inc. (Entergy), FTN Associates, Ltd. is pleased to submit the Monitoring Well Installation Report for the above-referenced site. We are also submitting the report on a CD in Adobe PDF format. Due to ADEQ s familiarity with the project, we are requesting an expedited review of this report and the Groundwater Sampling and Analysis Plan that was submitted for review and approval on December 10, 2012 (ADEQ DIN 63565). We hope to have both of these documents approved prior to the next sampling event which is tentatively scheduled for the week of October 7, If you have any questions regarding this report, please do not hesitate to contact me or Emily Brickman, PG, at (479) Respectfully submitted, FTN ASSOCIATES, LTD. Jane Spellman, PG Senior Project Manager JLS/fjm Enclosure cc: Mr. Nathan Gray, Entergy Arkansas, Inc. S:\PROJECTS\ \WP_FILES\L-B SADLER DOC

3 TECHNICAL MEMORANDUM DATE: August 30, 2013 TO: FROM: SUBJECT: Mr. Bill Sadler, P.G. Solid Waste Management Division Arkansas Department of Environmental Quality Ms. Emily J. Brickman, P.G. FTN Associates, Ltd. Monitoring Well Installation Report Entergy Arkansas, Inc., Entergy Independence Plant Class 3N Landfill Permit No S3N-R1, AFIN: FTN No. R On behalf of Entergy Arkansas, Inc. (Entergy), FTN Associates, Ltd. (FTN) is providing this memorandum report for the Entergy Independence Plant Class 3N Landfill in Newark, Arkansas. The memorandum presents a summary of field activities associated with the installation of five groundwater monitoring wells as required by Arkansas Pollution Control and Ecology Commission (APCEC) Regulation No. 22, (f), to improve the existing monitoring well network. 1.0 BACKGROUND FTN submitted a revised work plan dated December 21, 2012 (Arkansas Department of Environmental Quality [ADEQ] Document Identification Number [DIN] 63675), to install five monitoring wells that are generally evenly distributed around the perimeter of Phases 1 and 2 of the landfill and that represent groundwater quality at the relevant point of compliance as directed by APCEC Regulation No (a)(2). In a letter to Entergy dated March 6, 2013, the Solid Waste Management District (SWMD) of ADEQ granted conditional approval of the work plan for the new well installation (ADEQ DIN 64017). 2.0 FIELD ACTIVITIES Five new monitoring wells were installed during July 15-24, Depths of these wells range between 41 and 42 ft below ground surface (bgs). Drilling and well construction was performed by Tri-State Testing Services (Tri-State), an Arkansas-licensed driller, with an FTN registered

4 Mr. Bill Sadler, P.G. August 30, 2013 Page 2 professional geologist onsite to document field activities. Procedures adhered to methods described in Handbook of Suggested Practices for the Design and Installation of Ground-Water Monitoring Wells (US Environmental Protection Agency [EPA], 1991) and follow the requirements of the Arkansas Water Well Construction Commission (AWWCC). Boreholes were advanced through subsurface materials using an 8 ¼-inch (OD), continuous flight hollow-stem auger (HSA). Continuous samples were collected with a 5-ft continuous sampler, and soils were logged and classified according to the Unified Soils Classification System (USCS). A site map showing monitoring well locations is included as Attachment 1, and boring logs are included in Attachment 2. Wells were constructed using 2-inch diameter, flush-threaded, solid Schedule 40 PVC riser and a 10-foot, inch slotted, flush-threaded well screens. Well construction details are included as Attachment 3. Heaving sands and gravels were encountered during well installations and caused natural formation material to cover portions of the well screens. The annular space around unaffected portions of well screens were subsequently filled with silica sand during HSA, casing removal and the filter pack was tamped into place to verify proper compaction. A bentonite pellet seal was placed on top of the filter pack followed by a well-mixed, bentonite-cement grout. Monitoring wells were secured at the surface with 4-inch, locking, protective casings and concrete pads, and four protective bollards. An alpha-numeric label was assigned to each well installation. FTN developed the wells on July 17-24, 2013, in general accordance with EPA guidance (EPA 1991). Wells were mechanically surged and over pumped, which is typically sufficient to repair aquifer damage from the drilling operations and to restore the basic physical characteristics of aquifer. However, due to the natural filter pack material, a greater well development effort was necessary to restore formation hydraulic conductivity and yield relatively representative samples having low turbidity values with readings of 10 NTUs or less. The only well installation location that needed adjustment due to field conditions was well location 703S. The proposed well location 703S was located on the west side of the railroad tracks. Due to difficult access to the location, the well had to be installed to the east of the railroad tracks. The installation location for 703S was less than ft from the proposed well installation location, as required by SWMD conditional approval letter. 3.0 MONITORING WELL SURVEY Existing monitoring wells were resurveyed and new wells were located horizontally and vertically following completion by Harmon Surveying Inc. out of Conway, Arkansas. Horizontal coordinates are based on Arkansas State Plane North American Datum (NAD) of 1983 North and vertical control is based on Entergy s site referenced coordinate system, which is tied to the North American Vertical Datum (NAVD) of There is a ft conversion

5 Mr. Bill Sadler, P.G. August 30, 2013 Page 3 factor between the site vertical coordinate system and the NAVD88 system. Attachment 4 includes the certified survey report. If you have any questions regarding this technical memo, or require any additional information, please do not hesitate to contact me or Jane Spellman, P.G., at (479) EJB/fjm Attachments cc: Mr. Nathan Gray, Entergy Arkansas, Inc. (with attachments) Mr. Andy Wilson, Entergy Arkansas, Inc. (with attachments) Ms. Jane Spellman, FTN Associates, Ltd., (with attachments) Mr. Paul Crawford, FTN Associates, Ltd., (with attachments) S:\PROJECTS\ \TECH\2013 WELL INSTALLATIONS\WELL INSTALLATION REPORT\TM-B SADLER _DRAFT.DOCX

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7 TTMENT MONITORING WELL NETWOR M

8 701S 604S 704S 702S 703S 705S 605S 606S 511S 511S 603S

9 TTMENT ORING LOGS

10 -4 PROJECT: LOCATION: Newark, Arkansas DRILLING CONTRACTOR: Tri-State Testing Services DRILLING METHOD: TOTAL DEPTH of BORING: DEPTH TO WATER from TOC: FTN Project # R Hollow Stem Auger 43.5 ft bgs ft (7/24/2013) LOGGED BY: SAMPLING METHOD: DATE STARTED: DATE COMPLETED: EJB 5-foot continous sampler 7/16/2013 7/16/2013 Depth (feet) USCS Graphic Log Entergy Independence Plant 3N Landfill DRILLING EQUIPMENT: CME 750x Description BORING ID: 701S WELL ID: 701S NORTH: (AR State Plane NAD83N) EAST: (AR State Plane NAD83N) GROUND ELEV. (SRE): % REC Well Construction TOC ELEVATION (SRE): FILL FILL, consolidated fly ash, gray, dry. SILTY AY, gray with 15% orange and black mottling, medium stiff to stiff, fat to lean, dry. 3.7 ft. of stick-up and protective steel casing PVC vented below cap 34.9 ft of 2 in dia., Sch. 40 PVC solid riser Cement/Bentonite grout from 0 ft to 27.3 ft bgs 12 SILT with sand and clay, gray with 25% orange and black mottling, medium stiff, 12 ft. no sand, gray with 10% orange and black mottling, stiff, dry. 16 CH FAT AY, gray with <10% ferrous staining, fat, stiff, dry to moist. AY with silt, gray with 30-50% orange mottling, medium stiff, lean, moist. 20 CH FAT AY, gray with <10% ferrous staining, hard, dry to moist. AY with silt, gray with 30 to 50% orange mottling, hard, lean, 23 ft. with 23.5 ft. medium stiff, moist SP GC SC AY with sand, orange to brown, medium stiff, fat to lean, fine to medium grained sand, dry. SAND, brown to light tan, medium to fine grained, loose, 29 ft. 30 to 30.2 ft. FAT AY lens, gray. GRAVEL with some fine sand and fat clay, yellow orange, sub-angular, saturated. SAND with rounded gravel and fat clay, tan to orange, medium sand, dense, saturated. GRAVEL with sand and silt, dark brown, loose, angular to sub-rounded gravel, large grained sand, saturated Bentonite pellet seal from 27.3 ft bgs to 29.2 ft bgs Silica size 10/20 filter pack from 29.2 ft bgs to 37 ft bgs Natural filter pack from 37 ft bgs to 43.5 ft bgs 10 ft of 2 in dia., in slot, Sch. 40 PVC screen 0.3 ft, 2 in dia., Sch. 40 PVC end cap 40 GM 25 Drilling terminated at 43.5 ft bgs 44 NOTES: Well completion of 2' x 2' x 4" concrete pad, 4" x 4" steel protective cover. Heaving sands and gravels encountered during drilling. Total depth from TOC ft.

11 -4 PROJECT: LOCATION: Newark, Arkansas DRILLING CONTRACTOR: Tri-State Testing Services DRILLING METHOD: TOTAL DEPTH of BORING: DEPTH TO WATER from TOC: FTN Project # R Hollow Stem Auger 43 ft bgs ft (7/24/2013) LOGGED BY: SAMPLING METHOD: DATE STARTED: DATE COMPLETED: EJB 5-foot continous sampler 7/15/2013 7/15/2013 Depth (feet) USCS Graphic Log Entergy Independence Plant 3N Landfill DRILLING EQUIPMENT: CME 750x Description BORING ID: 702S WELL ID: 702S NORTH: (AR State Plane NAD83N) EAST: (AR State Plane NAD83N) GROUND ELEV. (SRE): % REC Well Construction TOC ELEVATION (SRE): FILL CH FILL, consolidated fly ash, gray, dry. FAT AY, gray with 5% tan, brown, and black mottling, stiff, blocky texture, dry. SILT with clay, gray to tan, soft to very soft, dry to moist. AY with silt, tan to gray, soft, lean, moist AY, brown to gray, medium stiff, lean, blocky texture, moist. 3.1 ft. of stick-up and protective steel casing PVC vented below cap 35.3 ft of 2 in dia., Sch. 40 PVC solid riser Cement/Bentonite grout from 0 ft to 27.8 ft bgs 12 FAT AY, gray with 15% orange mottling, stiff, dry to moist. CH 16 AY with silt, gray with 30-50% orange mottling, stiff, lean, blocky texture, 17.5 ft. with some rounded chert gravel CH FAT AY, brown with 15% black mottling, medium stiff, 23 ft. with orange mottling SC SW SC SW SP GM AY with sand, orange to brown, soft, fat to lean, fine grained sand, 29 ft. gray, saturated SAND with clay, gray, loose, fine grained, saturated. SAND with rounded gravel, brown to orange, fine grained, loose, saturated. SAND with clay, gray to orange, loose, fine grained, saturated. SAND with rounded gravel, orange, fine to medium grained, loose, saturated. SAND, orange, loose, fine to meium grained, saturated. GRAVEL with sand and silt, brown to yellow, sub-angular, loose, medium grained sand, saturated Bentonite pellet seal from 27.8 ft bgs to 30 ft bgs Silica size 10/20 filter pack from 30 ft bgs to 40 ft bgs Natrual filter pack from 40 ft bgs to 43 ft bgs 10 ft of 2 in dia., in slot, Sch. 40 PVC screen 0.3 ft, 2 in dia., Sch. 40 PVC end cap Drilling terminated at 43 ft bgs 44 NOTES: Well completion of 2' x 2' x 4" concrete pad, 4" x 4" steel protective cover. Heaving sands and gravels encountered during drilling. Total depth from TOC ft.

12 -4 PROJECT: LOCATION: Newark, Arkansas DRILLING CONTRACTOR: Tri-State Testing Services DRILLING METHOD: TOTAL DEPTH of BORING: DEPTH TO WATER from TOC: FTN Project # R Hollow Stem Auger 44 ft bgs ft (7/24/2013) LOGGED BY: SAMPLING METHOD: DATE STARTED: DATE COMPLETED: EJB 5-foot continous sampler 7/16/2013 7/16/2013 Depth (feet) USCS Graphic Log Entergy Independence Plant 3N Landfill DRILLING EQUIPMENT: CME 750x Description BORING ID: 703S WELL ID: 703S NORTH: (AR State Plane NAD83N) EAST: (AR State Plane NAD83N) GROUND ELEV. (SRE): % REC Well Construction TOC ELEVATION (SRE): SP SILT with clay and angular white chert gravel, gray, medium stiff, dry. SAND, brown to gray, loose, medium grained, dry. AY, gray, lean, stiff, dry to 4-5 ft. moist. 3.1 ft. of stick-up and protective steel casing PVC vented below cap 35.3 ft of 2 in dia., Sch. 40 PVC solid riser Cement/Bentonite grout from 0 ft to 26 ft bgs 8 12 SILT with clay and sand, gray with 15% orange mottling and ferrous staining, stiff, fine grained sand, 9 ft. no sand, brown with 30% orange and black mottling, soft to medium stiff, moist. FAT AY, gray with 10% ferrous stains, fat, stiff to hard, blocky texture, dry to moist ft. gray with 30% orange mottling and ferrous staining. 20 AY with silt, gray with 30-50% orange mottling, medium stiff, fat to lean, dry to 20 ft. angular gray concretions. 24 AY with sand, orange to brown, medium stiff, fat to lean, fine to medium grained sand, dry SC SP SAND with clay, yellow-orange, loose to medium dense, dry to moist. SAND, brown, medium to fine grained, loose, saturated. GRAVEL with sand and silt, brown to orange, rounded to sub-angular, loose, medium grained sand, saturated. 5 Bentonite pellet seal from 26 ft bgs to 28 ft bgs Natural filter pack from 28 ft bgs to 44 ft bgs 36 GM ft of 2 in dia., in slot, Sch. 40 PVC screen 0.3 ft, 2 in dia., Sch. 40 PVC end cap 40 GRAVEL interlayered with sand and silt, saturated. Drilling terminated at 44 ft bgs GM/SP NOTES: Well completion of 2' x 2' x 4" concrete pad, 4" x 4" steel protective cover. Heaving sands and gravels encountered during drilling. Total depth from TOC ft.

13 -4 PROJECT: LOCATION: Newark, Arkansas DRILLING CONTRACTOR: Tri-State Testing Services DRILLING METHOD: TOTAL DEPTH of BORING: DEPTH TO WATER from TOC: FTN Project # R Hollow Stem Auger 43 ft bgs ft (7/24/2013) LOGGED BY: SAMPLING METHOD: DATE STARTED: DATE COMPLETED: EJB 5-foot continous sampler 7/17/2013 7/17/2013 Depth (feet) USCS Graphic Log Entergy Independence Plant 3N Landfill DRILLING EQUIPMENT: CME 750x Description BORING ID: 704S WELL ID: 704S NORTH: (AR State Plane NAD83N) EAST: (AR State Plane NAD83N) GROUND ELEV. (SRE): % REC Well Construction TOC ELEVATION (SRE): SILT sith organics, brown, loose to medium stiff, dry. AY with silt and organics, tan to brown, stiff, blocky texture, lean, 3.5 ft. with ferrous orange and black mottling, fat, moist. 3.9 ft. of stick-up and protective steel casing PVC vented below cap 35.9 ft of 2 in dia., Sch. 40 PVC solid riser Cement/Bentonite grout from 0 ft to 26.8 ft bgs 8 12 SILT with clay, brown to gray, medium stiff, dry to 10 ft. moist. AY with silt, gray with 15-30% orange and black mottling, stiff, lean to fat, blocky texture, dry to moist SILT with clay, gray with 5-10% orange mottling, medium stiff, moist SM CH SM SAND with silt, brown to orange, very fine grained, medium dense, saturated. SILT with clay, gray, 30% orange and black ferrous staining, hard, moist. FAT AY with silt, gray, 10% orange and black mottling, hard, 30 ft. clayey sand seam (0.1 ft.), gray, medium to fine grained 30.1 ft. dark gray. SAND with some silt, orange to brown, loose, medium to large grained, saturated. 90 Bentonite pellet seal from 26.8 ft bgs to 29.5 ft bgs Silica size 10/20 filter pack from 29.5 ft bgs to 40 ft bgs Natural filter pack from 40 to 43 ft bgs GM GM/SP GRAVEL with sand and silt, orange to yellow, loose, angular to sub-rounded gravel, fine to large grained sand, saturated. GRAVEL interlayered with sand and silt, saturated ft of 2 in dia., in slot, Sch. 40 PVC screen 0.3 ft, 2 in dia., Sch. 40 PVC end cap Drilling terminated at 43 ft bgs 44 NOTES: Well completion of 2' x 2' x 4" concrete pad, 4" x 4" steel protective cover. Heaving sands and gravels encountered during drilling. Total depth from TOC ft.

14 -4 PROJECT: LOCATION: Newark, Arkansas DRILLING CONTRACTOR: Tri-State Testing Services DRILLING METHOD: TOTAL DEPTH of BORING: DEPTH TO WATER from TOC: FTN Project # R Hollow Stem Auger 43 ft bgs ft (7/24/2013) LOGGED BY: SAMPLING METHOD: DATE STARTED: DATE COMPLETED: EJB 5-foot continous sampler 7/18/2013 7/18/2013 Depth (feet) USCS Graphic Log Entergy Independence Plant 3N Landfill DRILLING EQUIPMENT: CME 750x Description BORING ID: 705S WELL ID: 705S NORTH: (AR State Plane NAD83N) EAST: (AR State Plane NAD83N) GROUND ELEV. (SRE): % REC Well Construction TOC ELEVATION (SRE): FILL FILL, consolidated fly ash, gray, loose, dry. SILT with sand and gravel, brown, loose to medium stiff, dry to moist. SILT with clay, gray with 15% orange mottling, stiff to hard, dry to moist. AY with silt, gray with 5% orange mottling, fat to lean, stiff, dry to moist ft. of stick-up and protective steel casing PVC vented below cap 34.9 ft of 2 in dia., Sch. 40 PVC solid riser Cement/Bentonite grout from 0 ft to 26.8 ft bgs 12 SILT with clay and sand, brown to gray with 10% orange mottling, medium stiff, fine grained sand, 12 ft. no sand, stiff to hard, gray with 10 to 15% mottling, dry to moist CH FAT AY, gray with 30% orange mottling, stiff to hard, dry to moist. AY with silt, gray with 15% orange mottling, dry to moist, 16.5 ft. gray concretions, blocky 18 ft. moist 24 SAND, tan, medium grained, loose, moist to dry. 23 ft SP CH GM SP 28.5 ft. saturated. FAT AY, gray, medium stiff, wet. GRAVEL with sand and silt, red to orange, rounded to sub-angular, loose, fine to large grained sand, saturated. SAND, brown, medium dense, large grained, saturated. GRAVEL with sand and silt, red to orange, rounded to sub-angular, loose, fine to large grained sand, saturated, interlayered with SAND, brown, medium dense, large grained, saturated Bentonite pellet seal from 24 ft bgs to 26.8 ft bgs Silica size 10/20 filter pack from 26.8 ft bgs to 38 ft bgs Natrual filter pack from 38 ft bgs to 43 ft bgs 10 ft of 2 in dia., in slot, Sch. 40 PVC screen 0.3 ft, 2 in dia., Sch. 40 PVC end cap Drilling terminated at 43 ft bgs 44 NOTES: Well completion of 2' x 2' x 4" concrete pad, 4" x 4" steel protective cover. Heaving sands and gravels encountered during drilling. Total depth from TOC ft.

15 ATTACHMENT 3 MONITORING WELL CONSTRUCTION TABLE

16 Monitoring well construction details for wells installed in August of 2013, Entergy Independence Plant Class 3N Landfill. ( ft below TOC 701S S S S S (a) Based on survey completed by Hannon Surveying, Inc., August 26, (b) Groundwnter levels were gauged following well instrjlation activities on July 24, SRE Site Referenced Elevation (based on site monuments). TOC Top of Casing.

17 ATTACHMENT WELL SURE

18 August 26, 2013 FTN Assoc. LTD. Attn: Emily Brickman, PG 124 W. Sunbridge Drive, Suite 3 Fayetteville, Arkansas Subject: Coordinates for Monitoring Wells at Entergy ISES, Newark, AR. Mrs. Emily Brickman: Harmon Surveying, Inc. was contracted to determine the coordinates for the Monitoring Wells at the Entergy ISES plant in Newark, AR, and the coordinates are as follows: Northing Easting SPC El. Plant El. Description top casing mw 703s conc rgs top casing mw 705s conc rgs top casing mw 701s conc rgs top casing mw 704s conc rgs top casing mw 702s conc rgs s conc rgs mw605s conc rgs s conc rgs mw606s conc P.O. BOX 691 CONWAY, AR PHONE: (501) FAX: (501)

19 rgs mw604s conc rgs These horizontal coordinates are base on Arkansas State Plane NAD83 North Coordinates, and the elevations are shown as NAVD88 (SPC) and plant elevations based on site monuments, and were surveyed using Trimble R8 GNSS. If you have any question or comments, please do not hesitate to call. Sincerely, Justin Dodd Harmon, AR. P.L.S #1356 P.O. BOX 691 CONWAY, AR PHONE: (501) FAX: (501)