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Home My WebLink AboutNC0004961_Revised Groundwater Monitoring Plan_20160806Water Resources ENVIRONMENTAL OVALITY PAT MCCRORY C'n'mnr DONALD R. VAN DER VAART S. JAY ZIMMERMAN nlrcclor August 8, 2016 CERTIFIED MAEL70151520 0000 7838 2395 Ronnie Goodman Duke Energy, Inc. Riverbend Steam Station 175 Steamplant Station Mount Holly, NC 28120 Subject: Revised Groundwater Monitoring Plan for NPDES Permit NC0004961 Riverbend Steam Station Dear Mr. Goodman: Attached is the revised Groundwater Monitoring Plan for the subject facility. The Division of Water Resources has revised Section 3(f) to allow for a 60 -day submittal period of the compliance well testing results. Also, please note the additional language added in Section 3(h). If you have any questions, please contact the DWR's Winston-Salem Regional Office at 336-776-9800. Sincerely, J.(A%, Debra J. Watts, Supervisor Animal Feeding Operations and Groundwater Protection Branch Water Quality Regional Operations Section Enclosure: Groundwater Monitoring Plan (8/8/16) cc: WSRO WQROS (w/enclosure) Sergei Chemikov- DWR Complex NPDES Permitting Unit (w/ enclosure) John Toepfer — Duke Energy (410 South Wilmington Street/NC 15, Raleigh, NC 27601) (w/ enclosure) WQROS Central File (w/ enclosure) Slate of North Carolina I Environmental Quality I Water Resources 1611 Mail service Crater I Raleigh, North Carolina 27699-1611 919 707 9000 GROUNDWATER MONITORING PLAN The permittee shall conduct groundwater monitoring as may be required to determine the compliance of this NPDES permitted facility with the current groundwater Standards found under 15A NCAC 2L .0200. WELL CONSTRUCTION a. Monitoring wells shall be constructed in accordance with 15A NCAC 02C .0108 (Standards of Construction for Wells Other than Water Supply) and any other jurisdictional laws and regulations pertaining to well construction. b. Monitoring wells must be constructed by a North Carolina Certified Well Contractor, the property owner, or the property lessee according to General Statutes 87-98.4. If the construction is not performed by a certified well contractor, the property owner or lessee, provided they are a natural person, must physically perform the actual well construction activities. C. Within 30 days of completion of well construction, a completed Well Construction Record (Form GW -1) must be submitted for each compliance monitoring well to Division of Water Resources, Water Quality Regional Operations Section (WQROS), 1636 Mail Service Center, Raleigh, NC 27699-1636. d. The Mooresville Regional Office, telephone number (704) 663-1699, shall approve the location of new compliance monitoring wells prior to installation. The regional office shall be notified at least 48 hours prior to the construction of any compliance monitoring well and such notification to the WQROS regional supervisor shall be made from 8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays. e. All monitoring wells shall be regularly maintained. Such maintenance shall include ensuring that the well caps are rust -free and locked at all times, the outer casing is upright and undamaged, and the well does not serve as a conduit for contamination. f. If the Permittee intends to abandon a compliance monitoring well either temporarily or permanently, the Permittee shall justify the abandonment and request approval from the WQROS Regional Office within 30 business days prior to initiating abandonment procedures. g. Monitoring wells shall be abandoned in accordance with 15A NCAC 02C .0113 (Abandonment of Wells). Within 30 days of completion of well abandonment, a completed Well Abandonment Record (Form GW -30) must be submitted for each monitoring well to WQROS, 1636 Mail Service Center, Raleigh, NC 27699-1636. 2. MAPS a. Updated maps shall be provided within 60 days when any of the following occur: i. Compliance monitoring wells are added or deleted from the plan. ii. The facility operation changes that would require a change in the waste boundary, compliance boundary, or property line. b. If the map is updated, the Permittee shall submit two original copies of a site map with an appropriate scale to easily identify all features overlaid on the most recent aerial photograph. At a minimum, the map shall include the following information: i. The location and identity of each monitoring well. ii. The location of major components of the waste disposal system. iii. The location of property boundaries within 500 feet of the disposal areas. iv. The elevation of the top of the well casing (i.e., measuring point) relative to a common datum. vi. The depth of water below the measuring point at the time the measuring point is established. NC0004961 — Riverbend Steam Station Groundwater Monitoring Plan Page 1 of 3 August 8, 2016 vii. The location of compliance boundary. viii. The date the map is prepared and/or revised. ix. Topographic contours in no more than ten (10) foot intervals. For areas of high relief, 20 foot intervals shall be acceptable. C. The map and any supporting documentation shall be sent to the WQROS, 1636 Mail Service Center, Raleigh, NC 27699-1636. 3. GROUNDWATER SAMPLING AND COMPLIANCE. a. The compliance boundary for the disposal system shall be specified in accordance with 15A NCAC 02L .0107(a) or (b) dependent upon the date permitted. An exceedance of groundwater standards at or beyond the compliance boundary is subject to remediation action according to 15A NCAC 02L .0106(c) or (d) as well as enforcement actions in accordance with North Carolina General Statute 143- 215.6A through 143-215.6C. b. Monitoring wells shall be sampled after construction and thereafter at the frequencies and for the parameters as specified in Part 4 of this plan. All maps, well construction forms, well abandonment forms and monitoring data shall refer to the permit number and the well nomenclature. C. Per 15A NCAC 02H .0800, a Division certified laboratory shall conduct all laboratory analyses for the required effluent, groundwater or surface water parameters. d. The measurement of water levels shall be made prior to purging the wells. The depth to water in each well shall be measured from the surveyed point on the top of the casing. e. The measuring points (top of well casing) of all monitoring wells shall be surveyed to provide the relative elevation of the measuring point for each monitoring well. The measuring points (top of casing) of all monitoring wells shall be surveyed relative to a common datum. f. Two copies of the monitoring well sampling shall be submitted on a Compliance Monitoring Form (GW-59CCR), and received no later than 60 days from the sampling date. Copies of the laboratory analyses shall be kept on site, and made available upon request. The Compliance Monitoring Form (GW-59CCR) shall include this permit number and the appropriate well identification number. The Compliance Monitoring Forms (GW-59CCR) shall be submitted to the Division of Water Resources Information Processing Unit, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 g. For groundwater samples that exceed the ground water quality standards in 15A NCAC 02L .0202, the Regional Office shall be contacted within 30 days after submission of the groundwater monitoring form; an evaluation may be required to determine the impact of the waste disposal activities. Failure to do so may subject the permittee to a Notice of Violation, fines, and/or penalties. h. The provisions of sections 3(f) and 3(g) apply only to the sampling events described in 3(b) above. The reporting requirements for any sampling events other than those described in 3(b) above shall be in accordance with the general provisions of 15A NCAC 02L. 4. MONITORING WELLS, PARAMETERS, AND SAMPLING FREQUENCY. a. Laboratory methods shall be EPA approved and sufficient to detect constituent quantities at or below their individual 15A NCAC 02L groundwater standards. b. The following chart contains the compliance monitoring wells to be sampled, the parameter; to be sampled, and the frequency in which the samples shall be collected. NC0004961 — Riverbend Steam Station Groundwater Monitoring Plan Page 2 of 3 August 8, 2016 MONITORING WELLSt,2 PARAMETERS FREQUENCY Laboratory Parameters Aluminum Antimony Arsenic Barium Beryllium Boron Cadmium Calcium Cobalt Chromium Copper Iron MW-7SR, MW-7D, Lead Magnesium Manganese Molybdenum Mercury Nickel Potassium Selenium MW-8S, MW-8I, MW-8D, Sodium Strontium Thallium Vanadium MW-9, MW-10, MW-1 ISR, MW-11DR,Zinc MW-13, MW-14, MW-15, BG-1S, BG-1D, BG-2S, HG-2D, BG-2BR BG-3S, BG-3D, GWA-7S, GWA- 7D, GWA-7BR February, June, October Chloride Sulfate Alkalin Alkalinity Total Dissolved Total Bicarbonate Carbonate Solids Suspended I Solids Field Parameters Turbidity pH Temperature Specific Conductance Dissolved Oxygen Oxidation Reduction Potential Water level Note 1: Groundwater modeling for monitoring wells MW -9, MW -10, and MW -13 has been removed from the groundwater monitoring plan as this information would be best suited for inclusion in a comprehensive site assessment plan. Duke is still required to submit ground water quality data for these wells. Note 2: Monitoring wells BG -IS, BG -1D, BG -2S, BG -2D, BG-2BR, BG -3S, BG -3D were added to establish background concentrations in groundwater. NC0004961— Riverbend Steam Station Groundwater Monitoring Plan Page 3 of 3 August 8, 2016