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HomeMy WebLinkAboutWI0400566_Permit (Issuance)_20210315NC Department of Environmental Quality — Division of Water Resources (DWR) NOTIFICATION OF INTENT (NOI) TO CONSTRUCT OR OPERATE INJECTION WELLS The following are `permitted by rule" and do not require an individual permit when constructed in accordance with the rules of 15A NCAC 02C.0200 (NOTE: This form must be received at least 14 DAYS prior to injection) AQUIFER TEST WELLS (15A NCAC 02C .0220) These wells are used to inject uncontaminated fluid into an aquifer to determine aquifer hydraulic characteristics. IN SITU REMEDIATION (15A NCAC 02C .0225) or TRACER WELLS (15A NCAC 02C .0229): 1) Passive Injection Systems - In -well delivery systems to diffuse injectants into the subsurface. Examples include ORC socks, iSOC systems, and other gas infusion methods (Note: Injection Event Records (IER) do not need to be submitted for replacement of each sock used in ORC systems). 2) Small -Scale Injection Operations — Injection wells located within a land surface area not to exceed 10,000 square feet for the purpose of soil or groundwater remediation or tracer tests. An individual permit shall be required for test or treatment areas exceeding 10,000 square feet. 3) Pilot Tests - Preliminary studies conducted for the purpose of evaluating the technical feasibility of a remediation strategy in order to develop a full scale remediation plan for future implementation, and where the surface area of the injection zone wells is located within an area that does not exceed five percent of the land surface above the known extent of groundwater contamination. An individual permit shall be required to conduct more than one pilot test on any separate groundwater contaminant plume. 4) Air Injection Wells - Used to inject ambient air to enhance in -situ treatment of soil or groundwater. 5) In -Situ Thermal Wells (IST) — Used to `heat' contaminated groundwater to enhance remediation. Print Clearly or Type Information. Illegible Submittals Will Be Returned as Incomplete. DATE: March 5 , 2021 PERMIT NO. W 10400566 (to be filled in by DWR) NOTE- If this NOI is being submitted as notification of a modification of a previously issued NOI for this site (e.g., different injection wells, plume, additives, etc.) and still meets the deemed permitted by rule criteria, provide the previously assigned permit tracking number and any needed relevant information to assess and approve injection: Permit No. WI Issued Date: A. WELL TYPE TO BE CONSTRUCTED OR OPERATED (1) X Air Injection Well Complete sections B through F, J, M (2) Aquifer Test Well . Complete sections B through F, J, M (3) Passive Injection System Complete sections B through F, H-M (4) Small -Scale Injection Operation Complete sections B through M (5) Pilot Test Complete sections B through M (6) Tracer Injection Well Complete sections B through M (7) In -Situ Thermal (IST) Well Complete sections B through M B. STATUS OF WELL OWNER: State Government Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 1 C. WELL OWNER(S) — State name of Business/Agency, and Name and Title of person delegated authority to sign on behalf of the business or agency: Name(s): NCDEQ, DWM, UST Section, State -Lead Program Mailing Address: 1636 Mail Service Center City: Raleigh State: NC Zip Code: 27699-1636 County: Wake Day Tele No.: 919-707-8166 Cell No.: EMAIL Address:Herbert.Berger@ncdenr.gov Fax No.: 919-707-8170 D. PROPERTY OWNER(S) (if different than well owner/applicant) Name and Title: Derek A. Shore Company Name NA Mailing Address: 2424 US Highway 21 City: Hamptonville State: NC Zip Code:27020 County: Yadkin Day Tele No.: 704-5646-3200 Cell No.: 336-466-0520 EMAIL Address: Unknown Fax No.: Unknown E. PROJECT CONTACT (Typically Environmental Consulting/Engineering Firm) Name and Title: Al Quarles, Project Manager Company Name ATC Associates of North Carolina, P.C. Mailing Address: 7606 Whitehall Executive Center Drive, Suite 800 City: Charlotte State: NC Zip Code: 28273 County: Mecklenburg Day Tele No.: 704-529-3200 Cell No.: 803-984-6764 EMAIL Address: Al.Quarles@atcgs.com Fax No.: F. PHYSICAL LOCATION OF WELL SITE (1) Facility Name & Address: TF- 15063, 2425 US Highway 21 City: Hamptonville County: Yadkin Zip Code: 27020 (2) Geographic Coordinates: Latitude**: 36.097888 Longitude**: -80.7602855 Reference Datum: Sparge Well Accuracy: Method of Collection: Google Earth **FOR AIR INJECTION AND AQUIFER TEST WELLS ONLY: A FACILITY SITE MAP WITH PROPERTY BOUNDARIES MAY BE SUBMITTED IN LIEU OF GEOGRAPHIC COORDINATES. G. TREATMENT AREA Land surface area of contaminant plume: NA square feet Land surface area of inj. well network: NA square feet (< 10,000 ft2 for small-scale injections) Percent of contaminant plume area to be treated: NA (must be < 5% of plume for pilot test injections) Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 2 H. INJECTION ZONE MAPS — Attach the following to the notification. (1) Contaminant plume map(s) with isoconcentration lines that show the horizontal extent of the contaminant plume in soil and groundwater, existing and proposed monitoring wells, and existing and proposed injection wells; and (2) Cross-section(s) to the known or projected depth of contamination that show the horizontal and vertical extent of the contaminant plume in soil and groundwater, changes in lithology, existing and proposed monitoring wells, and existing and proposed injection wells. (3) Potentiometric surface map(s) indicating the rate and direction of groundwater movement, plus existing and proposed wells. DESCRIPTION OF PROPOSED INJECTION ACTIVITIES AT THE SITE — Provide a brief narrative regarding the cause of the contamination, and purpose, scope, goals of the proposed injection activity: Air sparging (using air compressor) connected to one well (AS-1) during 96-hour Mobile Multi -Phase Extraction Event (MMPE) using two wells MW-1 and RW-1. Approximately 5 cfm per well for approximately 96 hours. Scheduled for March 15 to March 19, 2021. J. WELL CONSTRUCTION DATA (1) No. of injection wells: 1 (AS-1, see GW- 1) Proposed Existing (provide NC Well Construction Record (GW-1) for each well) (2) Appx. injection depths (BLS): (3) For Proposed wells or Existing wells not having GW-1 s, provide well construction details for each injection well in a diagram or table format. A single diagram or line in a table can be used for multiple wells with the same construction details. Well construction details shall include the following (indicate if construction is proposed or as -built): (a) Well type as permanent, Geoprobe/DPT, or subsurface distribution infiltration gallery (b) Depth below land surface of casing, each grout type and depth, screen, and sand pack (c) Well contractor name and certification number K. INJECTION SUMMARY NOTE: Only injectants approved by the epidemiology section of the NC Division of Public Health, Department of Health and Human Services can be injected. Approved injectants can be found online at http: //deq.nc. gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/ground-water- protection/ground-water-approved-injectants. All other substances must be reviewed by the DHHS prior to use. Contact the UIC Program for more info if you wish to get approval for a different additive. However, please note it may take 3 months or longer. If no injectants are to be used use N/A. Injectant: Compressed air Total Amt. to be injected (gal)/event:-5 cfm x 96 hours = 28,800 cubic feet Injectant: Total Amt. to be injected (gal)/event: Total Amt. to be injected (gal/event): 28,800 cubic feet No. of separate injection events: Total Amt. to be injected (gal): Source of Water (if applicable): NA Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 3 L. MONITORING PLAN — Describe below or in separate attachment a monitoring plan to be used to determine if violations of groundwater quality standards specified in Subchapter 02L result from the injection activity. Sampling of wells AS-1, MW-1, MW-3, MW-5, MW-12, and RW-1 approximately two weeks subsequent to MMPE event. M. SIGNATURE OF APPLICANT AND PROPERTY OWNER Well Owner/Applicant: `I hereby certify, under penalty of law, that I am familiar with the information submitted in this document and all attachments thereto and that, based on my inquiry of those individuals immediately responsible for obtaining said information, I believe that the information is true, accurate and complete. I am aware that there are significant penalties, including the possibility of fines and imprisonment, for submitting false information. I agree to construct, operate, maintain, repair, and if applicable, abandon the injection well and all related appurtenances in accordance with the 15A NCAC 02C 0200 Rules." Signatp'%e of Applicant Al Quarles, P.G., with ATC, as agent for and under contract with NCDEQ Print or Type Full Name and Title Property Owner (if the property is not owned by the Well Owner/Applicant): "As owner of the property on which the injection well(s) are to be constructed and operated, I hereby consent to allow the applicant to construct each injection well as outlined in this application and agree that it shall be the responsibility of the applicant to ensure that the injection well(s) conform to the Well Construction Standards (15A NCAC 02C .0200)." "Owner" means any person who holds the fee or other property rights in the well being constructed. A well is real property and its construction on land shall be deemed to vest ownership in the land owner, in the absence of contrary agreement in writing. See attached Signed Agreement Derek A Shore, Property Owner Signature* of Property Owner (if different from applicant) Print or Type Full Name and Title *An access agreement between the applicant and property owner may be submitted in lieu of a signature on this form. Please send 1 (one) hard color copy of this NOI along with a copy on an attached CD or Flash Drive at least two (2) weeks prior to injection to: DWR — UIC Program 1636 Mail Service Center Raleigh, NC 27699-1636 Telephone: (919) 707-9000 Deemed Permitted GW Remediation NOI Rev. 2-17-2020 Page 4 Herb Berger Hydrogeologist DWM UST Section 1637 Mail Service Ctr Raleigh, NC 27699-1637 RE: Access Agreement Former Williams Grocery 2425 U.S. Hwy 21 Hamptonville, Yadkin County, North Carolina Incident #15063 Dear Mr. Berger: I am/We are the owner(s) of a parcel of property, located at or near the incident in question, and hereby permit the Department of Environment and Natural Resources (Department) or its contractor to enter upon said property for the purpose of conducting an investigation of the groundwaters under the authority of G.S. 143-215.3(a)2. am/We are granting permission with the understanding that: 1. The investigation shall be conducted by the UST Section of the Department's Division of Waste Management or its contractor. 2. The costs of construction and maintenance of the site and access shall be borne by the Department or its contractor. The Department or its contractor shall protect and prevent damage to the surrounding lands. 3. Unless otherwise agreed, the Department or its contractor shall have access to the site by the shortest feasible route to the nearest public road. The Department or its contractor may enter upon the land at reasonable times and have full right of access during the period of the investigation. 4. Any claims which may arise against the Department or its contractor shall be governed by Article 31 of Chapter 143 of the North Carolina General Statutes, Tort Claims Against State Departments and Agencies, and as otherwise provided by law. 5. The information derived from the investigation shall be made available to the owner upon request and is a public record, in accordance with G.S. 132-1. 6. The activities to be carried out by the Department or its contractor are for the primary benefit of the Department and of the State of North Carolina. Any benefits accruing to the owner are incidental. The Department or its contractor is not and shall not be construed to be an agent, employee, or contractor of the landowner. I/We agree not to interfere with, remove, or in any way damage the Department's well(s) or its contractor's well(s) and equipment during the investigation. Sincerely, Signature ler, Type/Print Name of Owner or Agent -s3 CF `f (Du) - vs- p_o (C) 70 LI szf Co 3 a-v v ( ) Phone Number 3-4 aq Us a i N-wki Address 4QL2vrwI'f/e `JC 01-70av City/State/Zip Code y(2-0 Flo Date WELL CONSTRUCTION RECORD Thv &xrn can b: used for siopk pr muipk was 1. w'd1 Contractor Information: Stefan Smith Wc11 C'premoor Name 3576A N(' w'c11 Coonttctor C. rti1ri:alton Nusnbcr SAEDACCO Inc ('tsngralo rf:antt 2. Well ('onsinietion Permit ft: fro all appto rsfrlr uric prvm.h fir. (-ox,ir Yvette. Varium'r J/ &1 crl err- r 3. Well Use (check well owl: Water Supply Well: OAgricultural fGeothemtal tiieating•'oolinr Supply( O IndustrialtCommercial 0Irrigation DMunicipai.rPublic DResidetuial Water Supply (single) ORcsidenttal Water Supply (shared) Non -Water SupplyWell: ❑Monitoring injection Welt: 0Aquifer Recharge DAquifer Storage and Recover' 0Aquifer Text OEwperimcniil Tcchnok DGeothemial (Closed Loop) ❑Geothemtal (HeatinglC'oohng Return) 4, Date Wel(s) Completed: 5/31/2016 ta. WCI Location: Former Williams Grocery FacOit now err Name DRecmery Cl("lroundt:lter ReinedtaIion ❑Salinity Barrier ❑Stormwater Drsinagc O5tlbsidcucc Control C)Tracer XOtlter (explain under 021 Retnad.$) Well In/ AS1 Fact1it, tifapplicabki 2401 US Highway 21, Hamptonville, NC, 27020 Ph•. steal Address. Cu,. and Ztp Yadkin Contgs Farce) Itknitfr.wiort No (PIN) 5b. Latitude and Longitude in dcgr•ecseminutcs/aeconds or decimal degrees: (if we() ricld. out latiotq; N sunk Ciit1 36.0657 -80.4413 6. L% tare) the wetl(s): ZlPermartent or 0Temporary 7. la this a repair to an existing well: 31'es or SE No tf shls .; r. rrlxtlr. fill nut Gyrwtr well r,Jras:nit rfr.n iltfOrle tri.stt.e,,1 r.zpi.rtn rh.• rtw1Nrr• elf rhr repair und,,- n221 ere aria srr'tiaM ar ran Ow bark of this form. S. Number of wells constructed: 1 for maluple urjr1'reon .a form -wale', urrp1l writs ONLY wwh rill srnl e e t:snourrion tc.0 ran .satmut acre farm. 9. Total well depth bekm land surface. 45 (ft.l 1'or trrakrjs& wrfls ltat all dahrks if rfiifeteor lrtnmplr- it OM)' asd 2t1tFor) 10. Static water Level below' alp of easing: (ft.) I; nuke kart a ahorr encase We "4 11. Borehole diameter: 8 (in.) 12, Well coostrwcd.j method: HSA Ii.e. anfer. roses,. cable direct tech ex i FOR WATER SUPPLY' WELLS ONLY: 13a. Yield (,;pat) Method (dust: 13b. Disinfection type:_.---_ _.-_.------__ _-- Amount: 05 For Irecrnil U-s ONl N' st.WATER S PROM 10 1 ises(amrnos i 37 ft. 45 ft. I Silt 11. fl. 1S. OUTER CASING fbennitivalted wag (*_i._NEA#g FROM TO DIAMETER THWKINESS MATTRIAI.. 0 ft. 40 ft. 2 hi. rabic) 40 PVC Id: MTilfEM Cd$134k OR .. r , _ -_- ..: roost TO DIAMETER Tliil 3 LSS M.ATtRi.AL h. n. N. ft. lie. 17rSfittlik FROM TO DIAMETER StA f SIP: THICKN 311 t MATY.RI Al, 40 h. 45 h. 2 k 010 40 i PVC ft. ft. is 18. CtROOrr FROM TO MATERUI. EMPLACEMENT METRO4 8 AMOUNT 1 ft. 36 ft. r Portland/bentonite f . ft. ft. f 39. WiThiciltAVEL PAM Of misilicahlej mom TO MAITRIAL FMPt.ACEVENTMfTNO4 2 38 R. 45 ft. Sand ft H. 2110111111439M.LCIOi adage* sinif eersat9) FROM TO DESCRIPTION Lootrr.1(ati esa.rsn'twl,Dpe.prateline.ea.) Silt 0 ft. 45 ft. ft. 1t r1. ft. R. h. ft. n. R. h. ft. ft. - a1. tsttaA> S 2 foot bentonite seal from 36 to 38' 22. Certification: 5i*sm' of Cc . tcd w'etl Coon:mot' 5/24/2016 Dale !h signmk Mris J*»n. 1 hr rir certify that the nr1Ns! wax (wrrr) cvrtrtnxrtrl1 rn acveaslanrr n irh 15A NCAC 02C n100 or 1 CA NC AC ()2( 0200 Weft Crsnottn'n,-a Scood srds ,0WI Met o (-(Ircerf this wore, ha.+ hero provoke! or rhr urn owner. 23. Site diagram or additional well details: You may ttse die back of this page to proside additional well site details 0r well construction details. You DIM' also attach additional pages if necessary . SIIBNi1TfAL INSTUiCTJONS 24a. For All Wells: Submit this fort within 311 days of completion of well construction to the follrntita3: Dh-ision of Water Resources, Information Processing Unit. 1617 Mail Service Center, Raleigh. NC 27699-1617 24b. For Iniectio9 Weill ONLY: In addition to sending the form to the address in 24aabove. also submit a copy of this form within '10 days of completion of well construction to the following. Dh•tskot of Water Resources, Underground Injection Control Progtarn, 1636 Mali Service Center. Raklgb. NC 27699-1636 2.4e. For Water Supply & injection Welb: Also submit one copy' of this form within 10 days of completion of well construction to the county health department of the county when constructed Forts CzW-I Norm Combos Department of Fan traturscsu and Natural Resource - Un sou of Water Resbu rters Rc (sed August 24)13 COMPLETION REPORT OF WELL No. AS-1 Sheet 1 of 1 ID 0 0 0- 0- 0 a 0 0 uJ LU 0 0 0) J J W Z 0 0 2 O PROJECT: Williams Grocery PROJECT NO: 4305-14-239B PROJECT LOCATION: Hamptonville, North Carolina DRILLING CONTRACTOR: DRILLING METHOD: 41/" H.S.A. DATE COMPLETED: 5/31/16 WATER LEVEL: LATITUDE: LONGITUDE: TOP OF CASING ELEVATION: DATUM: LOGGED BY: Darren Cox STRATA WELL DETAILS DEPTH (ft.) LEGEND ELEVATION (ft.) WELL CONSTRUCTION DETAILS DESCRIPTION SYMBOL DEPTH (ft.) ,' 4' �i / i /' 4. 0.00 GS PROTECTIVE Diameter: RISER Diameter: GROUT SEAL FILTERPACK SCREEN Diameter: LEGEND ■ � 7i ISM 1 CASING Type: Interval: CASING 2" Type: PVC Interval: 0-45' Type: Portland Cement Interval: 0-36' Type: Bentonite Interval: 36'-38' Type: #2 sand Interval: 38'-45' 2" Type: 0.010 PVC Interval: 40'-45' FILTER PACK TOC TOP OF CASING BENTONITE GS GROUND SURFACE BS BENTONITE SEAL CEMENT GROUT BOC BASE OF OUTER CASING TSC TOP OF SCREEN CUTTINGS / BACKFILL BSC BOTTOM OF SCREEN STATIC WATER LEVEL TD TOTAL DEPTH CG CEMENT GROUT ' T 0 36.00 38.00 45.00 SILTY CLAY 1 tannish red GRAVELLY SILT_ % SILTY CLAY red 10 SILT brownish tan, petroleum odor 15 - _ 20 - - -25 _ SILT brown, petroleum odor stong 30 - SILT brown, wet, petroleum odor 35 -40 - - - S&IVIE COMPLETION REPORT OF WELL No. AS-1 ENGINEERING • TESTING Sheet 1 of 1 ENVIRONMENTAL SERVICES EXPLANATION 0 200 400 800 WATER SUPPLY WELL LOCATION APPROXIMATE SCALE IN FEET TITLE FIGURE 2 WATER SUPPLY WELL LOCATION MAP WILLIAMS GROCERY - NCDEQ INCIDENT #15063 2425 US HIGHWAY 21 HAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINA ATC ASSOCIATES OF NORTH CAROLINA, P.C. Charlotte, North Carolina 28273 (704) 529-3200 FAX (704) 529-3272 CAD FILE 1 5063_SM TYPE CODE PREP. BY AD REV. BY AQ SCALE AS SHOWN DATE 6.5.19 PROJECT NO. SLP1 506302 4J\\) -<O APARTMENTS FORMER USTs v \ ..,� ,ice FORMER <,» WILLIAMS s� \GROCERY ,/ <' • • 476.82 476.44 Notes: 1. Groundwater levels measured 02/12/20. 2. Dashed lines indicate areas of less certainty. 0 30 60 PETTY ROAV • • • ♦ ♦ • • 476.85 MW :i� 476.41N4k ` 476.83 120 APPROXIMATE SCALE IN FEET 1 W-1 478.50 475.76 A. 476.21 MW-5 475.84 EXI'LANA I ION MONITORING WELL LOCATION AIR SPARGE WELL LOCATION GROUNDWATER ELEVATION (AT WELL) GROUNDWATER CONTOUR LINE GROUNDWATER FLOW DIRECTION TITLE FIGURE 4 GROUNDWATER ELEVATION CONTOUR MAP WILLIAMS GROCERY — NCDEQ INCIDENT #15063 2425 US HIGHWAY 21 HAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINA ATC ASSOCIATES OF NORTH CAROLINA, P.C. Charlotte, North Carolina 28273 (704) 529-3200 FAX (704) 529-3272 CAD FILE TYPE CODE PREP. BY LB REV. BY NF SCALE AS SHOWN DATE 02/28/2020 PROJECT NO. SLP1506303 Constituent of Concern Benzene Toluene Ethyl benzene Xylene (Total) Methyl-tert-butyl ether Naphthalene 1,2-Dibromoethane (EDB) 1,2-Dichloroethane 1,2,4-Tri methyl benzene 1,3,5-Tri methyl benzene Di isopropyl ether Styrene n-Propylbenzene tert-Amyl Alcohol tent -Butyl Alcohol Legend 2L standards GCLStandards 5000 260000 84500 85500 20000 6000 50 400 28500 25000 70000 70000 30000 40000 10000 PETTY ROA FORMER UST !1 1''MW 0+. I RW-1 Standard Method 6200-VOCs ug/L Benzene 1200 Methyl-tert-butyl ether 57.9 Naphthalene 20.1 1,2-Dichloroethane 74.9 tert-Amyl Alcohol 2210 Standard Method 6200-VOCsug/L Benzene MW -4 No VOC Concentrations Detected ��v<� i) ,/" FORMER <�> WILLIAMS i � GROCERY �i� <� > • • •\ / �. i� MW-2 MW-4 Notes: 1. Groundwater samples collected on 02/13/2020 2. Underlined and italicized values exceed the Gross Contamination Levels. 3. Concentrations exceeding the 2L Standards are shown. 0 30 60 FO1RM RESI MW-1 MW-6 STs cy� Standard Method 6200-VOCs ug/L Benzene Toluene Ethylbenzene Xylene (Total) Methyl-tert-butyl ether Naphthalene 1,2-Dibromoethane (EDB) 1,2-Dichloroethane 19500 26400 2000 15300 36500 710 1130 2280 1,2,4-Trimethylbenzene 2260 1, 3, 5-Trimethyl benz ene 558 Diisopropyl ether 590 n-Propylbenzene 167 tert-Amyl Alcohol 59600 tert-Butyl Alcohol 286000 120 APPROXIMATE SCALE IN FEET MW-6 No VOC Concentrations Detected MW-5 Standard Method 6200-VOCsug/L Benzene 50.3 1,2-Dichloroethane 15.1 tert-Amyl Alcohol 137 MW-5 MW-3 Standard Method 6200-VO Cs ug/L Benzene 14200 Toluene Ethylbenzene Xylene (Total) Methyl-tert-butyl ether Naphthalene 1,2-Dibromoethane (EDB) 1,2-Dichloroethane 1,2,4-Trimethylbenzene 1, 3, 5-Trimethylbenzene Styrene n-Propylbenzene 34600 2940 19600 121J 1030 716 201 3560 942 88.9J 361 AL MW-12 No VOC Concentrations Detected MW-12 EXPLANATION MONITORING WELL LOCATION AIR SPARGE WELL LOCATION TITLE FIGURE 5 CONTAMINANTS OF CONCERN MAP WILLIAMS GROCERY — NCDEQ INCIDENT #15063 2425 US HIGHWAY 21 HAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINA ATC ASSOCIATES OF NORTH CAROLINA, P.C. Charlotte, North Carolina 28273 (704) 529-3200 FAX (704) 529-3272 CAD FILE TYPE CODE LB REV BY NF SCALE AS SHOWN 02/28/2020 PROJECT NO. SLP1 506303 \\"\// ,,& %FORMER !► WILLIAMS GROCERY 0\ \ //i \\ \ 16.1 M W-2 MW-4 <0.24 Notes: 1. Groundwater samples taken 02/12/20. 2. Dashed lines indicate areas of less certainty. MW-6 <0.24 D7 MW-12 • i RESI 0 50 100 APPROXIMATE SCALE IN FEET <0.50 EXPLANATION MONITORING WELL LOCATION AIR SPARGE WELL LOCATION BENZENE CONCENTRATION (AT WELL) BENZENE ISOCONCENTRATION LINE TITLE FIGURE 6 BENZENE ISOCONCENTRATION CONTOUR MAP WILLIAMS GROCERY - NCDEQ INCIDENT #15063 2425 US HIGHWAY 21 HAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINA ATC ASSOCIATES OF NORTH CAROLINA, P.C. Charlotte, North Carolina 28273 (704) 529-3200 FAX (704) 529-3272 CAD FILE TYPE CODE PREP. BY LB REV. BY NF SCALE AS SHOWN DATE 04/21/2020 PROJECT NO. SLP1 506303 12MWf # 74.9 201 i <'">> t / \'�\\„/ 1// \ / r1 \\ <\ /> / 1 \ n" // FORMER <y>�> !/ WILLIAMS " .. \\ GROCERY / \> \ // / • \ // \ / MW-2 -O MW-4 MW-12 <0.26 Notes: 1. Groundwater samples taken 02/12/20. 2. Dashed lines indicate areas of less certainty. 0 50 100 APPROXIMATE SCALE IN FEET EXPLANATION ▪ MONITORING WELL LOCATION ▪ AIR SPARGE WELL LOCATION <0.50 1,2-DICHLOROETANE CONCENTRATION (AT WELL) 1,2-DICHLOROETHANE ISOCONCENTRATION LINE TITLE FIGURE 7 1,2—DICHLOROETHANE ISOCONCENTRATION CONTOUR MAP WILLIAMS GROCERY NCDEQ INCIDENT #15063 2425 US HIGHWAY 21 HAMPTONVILLE, YADKIN COUNTY, NORTH CAROLINA ATC ASSOCIATES OF NORTH CAROLINA, P.C. Charlotte, North Carolina 28273 (704) 529-3200 FAX (704) 529-3272 CAD FILE TYPE CODE PREP. BY LB REV. BY NE SCALE AS SHOWN DATE 04/21/2020 PROJECT NO. SLP1506303