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HomeMy WebLinkAboutMulti ID#'s_Conditional Add Site Assmt Appr_20161123Water Resources ENVIRONMENTAL QUALITY PAT MCCRORY Govemor DONALD R. VAN DER VAART Sec'minry S. JAY ZIMMERMAN Direclor November 23, 2016 Mr. Harry Sideris Senior Vice President Environment, Health, and Safety Duke Energy 526 South Church Street Mail Code EC3XP Charlotte, NC 28202 Subject: Conditional Additional Site Assessment Approvals James E. Rogers Energy Complex (Formerly Cliffside Steam Station) NPDES Permit NC0005088 — Rutherford and Cleveland Counties Roxboro Steam Electric Plant NPDES Permit NC0003425 — Person County W. H. Weatherspoon Power Plant NPDES Permit NC0005363 — Robeson County Dear Mr. Sideris: On August 18, 2016, the North Carolina Department of Environmental Quality (DEQ) received the proposed plans to conduct additional assessment activities for the subject facilities per our request letter dated July 8, 2016. Based on a review of the plans and other information received by DEQ Regional Office staff, conditional approval of the plans is granted. DEQ's approval is contingent upon the following site specific conditions: James E. Rogers Energy Complex In the groundwater assessment report that will be provided following this investigation, please include the AMEC Foster Wheeler ash sampling results (map and tabular data). If monitoring well data indicate exceedances of the 15A NCAC 02L groundwater standards, notify DEQ's Asheville Regional Office immediately so that deeper wells may be located and installed expeditiously. The deeper well(s) would be needed to determine the vertical extent of groundwater contamination. DEQ concurs with the proposed boring/well locations, of which six are ash -related and one is background. State of North Carolina I Enviroamentel Quality I Water Resources 1611 Mail service Center I Raleigh, North Carolina 27699-1611 919 707 9000 • DEQ concurs with the sample depth intervals for purposes of Unified Soil Classification System descriptions. • Please revise the soil/ash sampling requirements as follows. For each of the six ash -related boring locations, a lab analysis (constituents are listed in Table 2) should be conducted for all sampled depth intervals that contain visual evidence of ash. If 4 or more intervals contain ash, conduct a lab analysis only on the shallowest ash interval, the deepest ash interval, and a composite of the remaining ash intervals, for a total of three ash lab analyses. DEQ concurs with the 5 -foot minimum thickness criterion to determine when to analyze variations in ash type (fly or bottom). For soil sampling and lab analysis at each of the six ash -related boring locations, DEQ concurs with the two proposed sample intervals: 2 feet below the ash/soil interface and 8 to 10 feet below the ash/soil interface. For SPLP analysis at each of the six ash -related boring locations, please conduct an analysis on o a) the sampled ash interval with the highest concentration of arsenic, selenium, and strontium among all sampled ash intervals at that location, and o b) a sample composited from the two sampled soil intervals at that location. For soil sampling and analysis at the background boring location, please collect: o a) one shallow soil sample at a depth that approximates the general depth of most of the shallow soil samples from the other six borings, o b) one deeper soil sample at a depth that approximates the general depth of most of the deeper soil samples from the other six borings, and o c) one SPLP sample that is a composite of the shallow and deeper intervals in a) and b) above. Please revise Section 2.2.3 to read that if inaccessible from the bank, a boat should be used to collect three surface water samples upstream, adjacent to, and downstream of the AOIs. These samples should be collected immediately adjacent to the bank during conditions that approximate low or baseflow to the maximum extent possible and at least 5 days after a previous rain event of any magnitude. Contact DEQ's Asheville Regional Office if this request becomes difficult to meet based on weather conditions. Antecedent rainfall (prior 5 days and prior 48 hours) should be provided, along with its measurement location, as a footnote in surface water results table. Roxboro Steam Electric Plant In the groundwater assessment report that will be provided following this investigation, please identify on a map all private supply wells within a 'h mile radius of an assumed compliance boundary around the study area, monitor well locations, any areas of wetness, and surface water features. DEQ recommends additional monitoring wells to be installed in each water -bearing hydrostratigraphic unit at a nested well location south east of existing well MW- 12ER. DEQ recommends relocating any proposed sampling point locations where insufficient sediment recovery is an issue. W. H. Weatherspoon Power Plant In the groundwater assessment report that will be provided following this investigation, please identify on a map all private supply wells within a''/z mile radius of an assumed compliance boundary around the study area, monitor well locations, any areas of wetness, and surface water features. DEQ recommends moving the proposed sample location JC -1 to the drainage feature before it enters the creek (coordinates N 34.5902, W 78.9660) In response to your "Proposed Waste and Compliance Boundaries" letter dated August 19, 2016, DEQ cannot approve the proposed revised compliance boundary locations for the subject facilities at this time. DEQ will provide correspondence and direction regarding this issue in the near future. Submit the findings of the site assessments for each subject facility as a groundwater site assessment report. The respective site assessment reports shall include figures, tables, cross- sections, and maps in a manner that provides an interpretation of site conditions. In each report, include a map that shows all private supply wells, monitoring well locations, any areas of wetness, and surface water features within a''/z mile radius of a previously established compliance boundary around the study area. Reports submitted in a data summary format will not be approved as an acceptable documentation of findings. Submit site assessment reports for each facility by March 31, 2017. Please begin implementing these plans immediately to include the conditional items listed. For general questions, contact Steve Lanter at (919) 807-6444. For more specific questions, please contact our Regional staff listed below: • James E. Rogers Energy Complex: Ted Campbell at (828) 296-4500 • Roxboro Steam Electric Plant: Eric Rice at (919) 791-4200 • W. H. Weatherspoon Power Plant: Kent White at (910) 433-3300 Sincerely, 4Jayimmennan, P.G., Directortor Division of Water Resources cc: ARO, FRO, & RRO WQROS Regional Supervisors and Assistant Supervisors WQROS Central File Copy