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Home My WebLink AboutWI0300045_Lab Data_20200827ROY COOPER Governor MICHAEL S. REGAN Secretary S. DANIEL SMITH Director NORTH CAROLINA Environmental Quality August 27, 2020 William White, Director of Facilities (via email) Catawba College 2300 W. Inns St. Salisbury, NC 28144 Subject: Catawba College Geothermal Well System Sampling Results Permit No. WI0300045 Geothermal Heating/Cooling Water Return Well Rowan County Dear Mr. White: The MRO received the results of the groundwater samples collected by Stewarts Environmental Services on August 17, 2020. The samples were collected from the geothermal system nodes at pre -determined influent and effluent ports. Other than Total Coliform Bacteria, the report indicates that none of the constituents analyzed were reported to be above the 2L standards for groundwater. Due to mislabeling of the groundwater collection data sheets, the MRO is attaching annotated data collection sheets that identify the influent and effluent ports (supply and return) where the samples were collected. Please use this information as a reference for future sampling events. Additionally, the report submitted by Stewarts Environmental Services indicated the system present at Catawba College is a closed loop geothermal system. Please also note that the system covered in this permit is an open loop geothermal well system. Catawba College does maintain a separate closed loop system that does not require a permit. The MRO did not receive sampling results for the 2015 permit renewal cycle. The 2015 staff report noted that the permittee was to collect the GW samples and submit the results to the MRO. MRO staff were not able to locate 2015 sample results in our files and Catawba College does not have records of the sample results. The permittee notes that the records may have been destroyed during staff turnover. As such, the MRO used the 2010 sample results to note system changes. In 2010, The Total Coliform Bacterial count present in the influent well in Loop 2 exceeded the 2L standard for Total Coliform. The MRO recommended that this well be chlorinated to reduce the coliform bacteria. The 2020 Total Coliform Bacterial counts greater than the 2L standard were noted in the Stewarts Environmental Services report (wells 13, 4, 9, and 3) and these represent several of the loops. The MRO recommends that all influent wells that D E Qbi�� North Carolina Department of Environmental Quality I Division of Water Resources Mooresville Regional Office 1 610 East Center Avenue, Suite 301 1 Mooresville, North Carolina 28115 vOry rN Cx:40:.itiA � N. a Io E".w^^�"��a°:r� /� 704.663.1699 reported Total Coliform Bacteria greater than 1 MPN be chlorinated. The MRO has attached the procedure for effective well chlorination. As a precautionary purpose, please make sure that all well heads, both influent and effluent, are protected from surface runoff that may flow toward the wellheads and that the sampling ports utilized in future sampling events are sanitized prior to sampling. The results indicate, at the time of the sampling, that all other measured parameters were below the 2L groundwater quality standards, which is consistent with previous sampling events. The report and supplemental information should be self-explanatory; however, should you have any questions, feel free to contact Edward Watson at our office by phone at 704-235-2198 or by email at edward.watson(&ncdenr.gov. Sincerely, DocuSigned by: A N N,uft F161 F669A2D84A3... Andrew H. Pitner, Assistant Regional Supervisor Water Quality Regional Operations Section Mooresville Regional Office Division of Water Resources, NCDEQ Attachments: Annotated Lab Results Final Report Well Disinfection Procedures CC: Laserfiche file Mike Rogers, UIC Permitting (via email)