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Home My WebLink About8003_Rowan_CDLF_WellWorkPlan_FID1522194_20210107J GOLDER January 7, 2021 Jaclynne Drummond, Hydrogeologist Department of Environmental and Natural Resources Division of Waste Management - Solid Waste Section 2090 US Highway 70 Swannanoa, North Carolina 28778 Project No. 20140083.300 PLAN TO REPLACE MONITORING WELLS MW-18R & MW-19 AT THE CLOSED C&D LANDFILL ROWAN COUNTY LANDFILL, PERMIT NO. 80-03 ROWAN COUNTY, NORTH CAROLINA Dear Ms. Drummond: On behalf of Rowan County (the County), Golder Associates NC, Inc. (Golder) has prepared this plan to replace two groundwater monitoring wells at the construction and demolition (C&D) unit. Wells MW-18R and MW-19 are the downgradient wells for the compliance monitoring network for the closed C&D landfill at the Permit No. 80-03 Rowan County Landfill facility in Woodleaf, North Carolina (NC). This plan was discussed in a telephone call and email correspondence on January 4, 2021. Additional groundwater assessment activities for this waste unit will be postponed pending groundwater sample analytical results from replacement monitoring wells. Monitoring well MW-18R is located close to the edge of waste between the waste unit and a sedimentation basin. During recent compliance monitoring events in 2019 and 2020, standing water has been noted in the vicinity of MW-18R and field parameters have been inconsistent at this location. Drainage around this area is not ideal for monitoring well placement due to the close proximity to waste and the sedimentation basin. It is possible that the standing water is impacting the well, and this location may not facilitate representative monitoring of the waste unit. Similarly, well MW-19 is located close to the edge of waste. Therefore, this location may also be unable to provide representative samples. To provide representative samples, the County is submitting this plan to replace MW-18R and MW-19 with wells MW-18R2 and MW-19R within the compliance boundary (i.e., 250 feet). The proposed locations are shown on the attached figure and have been field -verified for access. Slight modifications (i.e., <50') to these locations may be required for drilling rig access but will still be within the required 250 feet. Wells MW-18R and MW-19 will remain for the collection of water levels. We propose to install and develop these wells prior to completion of the second semi-annual groundwater monitoring event for 2021, which is typically performed in July/August each year. We appreciate your assistance with this project. If you have any questions, please contact the undersigned at 336-852-4903. Golder Associates NC, Inc. 5B Oak Branch Drive, Greensboro, North Carolina, USA 27407 T: +1 336 852-4903 F: +1 336 852-4904 Engineering Lic. No. C-2862/Geology Lic. No. C-399 Golder Associates NC, Inc. is a licensed user of the Golder trademark, and an associated operating entity. Golder and the G logo are trademarks of Golder Associates Corporation. golder.com Jaclynne Drummond, Hydrogeologist Project No. 20140083.300 Department of Environmental and Natural Resources January 7, 2021 Sincerely, Golder Associates NC, Inc. Darren Cox Staff Environmental Scientist DC/RPK/dc: Rachel P. Kirkman, PG Principal and Senior Consultant CC: Caleb Sinclair, Rowan County Environmental Management, 1102 N Long Street Extension Salisbury, NC 28144, caleb.sinclair@rowancountync.gov (letter only) Jeff Boyd, Landfill Manager, 789 Campbell Road, Woodleaf, NC 27054, (704) 278-2211 Attachment: Figure 1 - Site Map with Proposed Replacement Monitoring Well Locations https://golderassociates.sharepoint.com/sites/132916/project files/5 technical work/2020-2021 rowan county landfill/phase 300 general consulting/well relocation request/final/20140083.300 rowan county work plan letter.docx V GOLDER 2 CURRRENT LANDFILL ENTRANCE EXISTING SEDIMENT BASIN I II Ipel s� III I I I I EXISTING SEDIMENT I BASIN I I I E MMW16A I I I I I 69z 00 I I I I I� 680aw I� 1 1 1 I N I E 1 1 670 i� SCALE HOUSE EXISTING SEDIMENT BASIN .01 G� �cpe' LEGEND 011 EXISTING SEDIMENT BASIN 250 0 250 500 SCALE FEET FACILITY BOUNDARY NOTES 1. TOPOGRAPHIC CONTOUR INTERVAL = 2 FEET. 2. GROUNDWATER SURFACE CONTOUR INTERVAL = 10 FEET. 3. GROUNDWATER ELEVATIONS MEASURED ON AUGUST 10, 2020. 4. GROUNDWATER CONTOURS ARE BASED ON LINEAR INTERPOLATION BETWEEN AND EXTRAPOLATION FROM KNOWN DATA, TOPOGRAPHIC CONTOURS, AND KNOWN FIELD CONDITIONS. THEREFORE, GROUNDWATER CONTOURS MAY NOT REFLECT ACTUAL GROUNDWATER CONDITIONS. 5. GROUNDWATER CONTOUR LINES SHOW THE WATER TABLE SHAPE AND ELEVATION. THESE CONTOURS ARE INFERRED LINES FOLLOWING THE GROUNDWATER SURFACE AT A CONSTANT ELEVATION ABOVE SEA LEVEL. THE GROUNDWATER FLOW DIRECTION IS GENERALLY PERPENDICULAR TO THE GROUNDWATER SURFACE CONTOURS, SIMILAR TO THE RELATIONSHIP BETWEEN SURFACE WATER FLOW AND TOPOGRAPHIC CONTOURS. 6. SURFACE WATER MONITORING POINT SW-1 IS APPROXIMATELY 550 FEET OFF THE MAPPING LIMITS SHOWN AND IS COLLECTED FROM SECOND CREEK. 7. MONITORING WELLS MW-27A, MW-28 AND MW-6 ARE UTILIZED FOR WATER LEVEL MONITORING ONLY. 8. THE LOCATION OF THE FRENCH DRAIN MONITORING POINT IS APPROXIMATE. 9. MW-28R WAS INSTALLED JULY 11, 2017 TO REPLACE MW-28. MW-28 WILL CONTINUE TO BE UTILIZED FOR WATER LEVEL MONITORING. REFERENCE 1. EXISTING CONDITIONS INSIDE OF DASHED LINE COMPILED BY CARTOGRAPHIC AERIAL MAPPING, INC. USING PHOTOGRAMMETRIC METHODS, FROM AERIAL PHOTOGRAPHY DATED JUNE 26, 2020. EXISTING CONDITIONS OUTSIDE OF DASHED LINE PROVIDED BY S&ME ENGINEERING, INC., DATE UNKNOWN. 2. PROPERTY BOUNDARY TAKEN FROM CAD FILE TITLED, "WELLS.DWG," PROVIDED BY HDR INC. CLIENT ROWAN COUNTY, NORTH CAROLINA APPROXIMATE LIMITS OF WASTE Dense Vegetotion Q U --------------- 250-FOOT CLOSED C&D LANDFILL BUFFER PROJECT swj ROWAN COUNTY ACTIVE AND CLOSED LANDFILLS EXISTING TOPOGRAPHIC CONTOURS (2' INTERVALS) PERMIT No. 80-03 GROUNDWATER SURFACE CONTOURS ROWAN COUNTY NORTH CAROLINA APPROXIMATE GROUNDWATER FLOW SEGMENT USED TO GROUNDWATER CONTOUR MAP CALCULATE GRADIENT AUGUST 10, 2020 o O MW_7 EXISTING GROUNDWATER MONITORING WELL WITH 647.19 GROUNDWATER ELEVATION 1 ❑ SURFACE WATER MONITORING POINT CONSULTANT YYYY-MM-DD 2021-01-06 ii i 1 \ COMPLIANCE METHANE MONITORING POINT DESIGNED NTT ASSESSMENT METHANE MONITORING POINT ' G O L D E R PREPARED BPG - � TO SW-1 (SEE NOTE 6) wQ FRENCH DRAIN MONITORING POINT GoLDER ssoC s C, IN C. REVIEWED ASSOCIATES N RPK APPROVED RPK MW-19R PROPOSED GROUNDWATER MONITORING WELL PROJECT NO. REV. DRAWING 20-140083 0 1 IL