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Home My WebLink AboutNC0030210_Regional Office Historical File Pre 2018ArDWR North Carolina Department of Environment and Natural Resources Pat McCrory John . Skvada, III Governor Secretary November u, 2014 Darrell DeWitt, ORC CMUD-Mallard Creek CO0 10 4222 Westmont Drive Charlotte, NC 28217 Subject: February 5, 2014 toxicity split test review results DeWitt, This letter is in reference to the CMUD-Mallard Greek WRF whole effluent toxicity split test dated February 5 2014 Chronic Ceriodaphnia dubia pass/fail split testing was performed by Meritech, Inc., ETT Environmental, Inc. and Pace Analytical Services, Inc. The tests completed by l eritech, Inc. and ETT Environmental, Inc. passed and the test completed by Pace Analytical Services, Inc.' failed. A review of sampling, testing, and laboratory documents and procedures a completed to investigate the difference in test results. This review showed no obvious cause for the disagreeing results. Facility sampling procedures were discussed with Shannon Sypolt of the Charlotte - Mecklenburg g Utilities Department and found to be acceptable. As a reminder, for toxicity testing we highly recommend the following procedure be used to ensure that a thoroughly mixed and evenly portioned sample is obtained. :First, mix the composite sample d rinse each of the sampling containers. Then, mix the composite sample again and fill the first+ sample bottle 1/� full. Next, mix the composite sample main and fill the second sample bottle 1/4 full. Repeat this'mixing and pouring in r/4 mere eats, while alternating between the sample bottles, until all sample bottles are filled leaving minimal headspace. The test results from ritech, Inc. and ETT Environmental, Inc. will stand as i the official results d a result o "pass" has been recorded for the, February , 2014 C D-Mallard Creek WRF toxicity test. If you have any questions regarding this split test review please contact Christopher V"entaloro or Cindy Moore at 1 q-743-840 . Sincerely, C(indy A. M re, Supervisor, .Aquatic Toxicology Branch Water Sciences Section Division of Water Resources, ICDER 1621 tail Service Center, Raleigh, North Carolina 27699-1621 Location: 4401iReedy Creekfeted, Raleigh, North Carolina 27607 Phone: 919-74 - tFAX: 919-7 -6517 Internet: per Lncdenr. rgt bi g! a rn n Equal Opportunity 1 Affirmative Action Employer AJ7�h. F I L,,F'" NCDENR North Carolina Department of Environment and Natural Resources Division of Water QUality Beverly loaves Perdue Coleen Li Sullins Dee: Freeman 6avernor Director: seoreta V February 25, 2011 Ms Jacqueline A. Jarrell Charlotte Mecklenburg Utilities 4222 Westmont give Charlotte, North Carolina 28217 Subject: Toxicity Test Results CMU Mallard Creek WWTP NPDES Permit No. NCO030210 Mecklenburg County, N' Dear Ms. Jarrell: Enclosedis a copy of the toxicity test results relative to the inspection conducted at the subject facility on February 8 and 10, 211 by John Lesley of this Office. Whole effluent samples were collected for use in a chronic multiple dilution toxicity test. The test utilizing these samples resulted in a ChV of 100W The report should be self-explanatory; however, should you have any questions concerning this report, please do not hesitate to contact Mr. Lesley or me at (704)'683-1 9 . Sincerely„. s V w; ' l � Robert B. Krebs Regional Supervisor Surface Water Protection Enclosure cc: Central Files Susan Meadows, Aquatic Toxicology Unit Mecklenburg County Water tuality Protection Mailing Address Phone (704) 663-1699 Location (o)Ii Nrxrtharriiinrx 610 East Center Avenue, Suite 301 Fax (704) 663-6040 610 fast Center Avenue, Suite 301 Vw1 mill Mooresville, NC" 28115 Mooresville, North Carolina Internet: rvwwy.ncwaterguag1 ort? Customer Service 1-877-623-6748 NPLDES Permit No. NCO030210 Pape Whale effluent samples were collected on February 8 and 10, 2011 by John Lesley and facility staff for use in a chronic Ceriodaphnia dubia multiple dilution toxicity test'; CMU Mallard Creek TP pies resulted in a ChV of 100% (pass), i oxtctty test tnTOr-malluti tullvw . -Brood Ceriodaphnia dubia multiple dilution tion 0, 45, 67.5, 90, 95, and 100% sample ChU 100% (pass) it 100% reproduction 23.7 neonates Survival 90% n Reproduction IT3 neonates at the 100% test concentration. First Sample pH 6.91 SU First Sample Conductivity 445 micromhoslcm First Sample Total Residual Chlorine <0.1; mgll Second Sample pH 7.02 SU Second Sample Conductivity 478 micrornhostcm Second Sample Total Residual Chlorine <0.1 mgll Test results for these samples indicate that the effluent would not be predicted' to have water quality impacts on the receiving stream. Z/ Division of Water Quality February 22, 2011 MEMORANDUM To: Rob Krebs Surface Water ]Protection, MRO Through: Cindy A. Moore Supervisor, Aquatic Toxicology Unit From: Carol Hollenkamp � Quality .Assurance Of icer, Aquatic Toxicology Unit Subject: Whole effluent taxi CMUD-Mallard Cri NPDES Permit # N Mecklenburg Coup' ty test results WWTP 0030210/001 final composite samples of effluent discharged from CMUD- CM.UD-Mallard Creek WWTP has an effluent discharge (MGD) entering Mallard Creek (7QIO of 0.64 CFS). Whole 3 and February 10 by John Lesley and a facility representative with a chronic value (ChV) of 100% which is greater than the 90% whole effluent tox facility. Toxicity test information follows. Test Type 3-Brood C'er iodal)hnicr dubiar chronic mul Second Say Test' results' for tI impacts on recei Meritech, Inc. al toxicity monitori Basin: YAD I I cc: Central John Le Test Concentrations 0, 45, 67.5, 90, 95, 00% sample Test Result ChV :=100% Control Survival 100% Control Mean Reproduction 23.7 neonates Test Treatment Survival 90% " latment Mean Reproduction 17.3 neonates at 100% test concentration First Sample PIT 6.91 SU First Sample Conductivity 445 micronihos/cm ple Total Residual Chlorine <O.I mg/L Second Sample PH 7.02 SU S econd Sample Conductivity 478 micrornhos/cm nple Total Residual Chlorine <0.1 nag/L ie above samples indicate that the effluent would not be predicted to have water quality ving water, These samples were split and sent to Meritech, Inc. The test performed by so passed with a chronic value greaten than 0%. Please contact is if further effluent n is desired. e may be reached at(919) 743-8401. piles sley, MRCS Aquatic lox color y Unit Environmental Sciences Section S econd Sample Conductivity 478 micrornhos/cm nple Total Residual Chlorine <0.1 nag/L ie above samples indicate that the effluent would not be predicted to have water quality ving water, These samples were split and sent to Meritech, Inc. The test performed by so passed with a chronic value greaten than 0%. Please contact is if further effluent n is desired. e may be reached at(919) 743-8401. piles sley, MRCS Aquatic lox color y Unit Environmental Sciences Section i Dii North Carolina Department of Envir Division of Wa Beverly Eaves Perdue Coleen H. Governor Direct January . Jacqueline A. Jarrell Charlotte Mecklenburg Utilities 4222 Westmont Drive Charlotte, North Carolina 28217 Subject: Toxicity Test CM'U Mallard ( NPD S Perrni Mecklenburg C Dear Ms. Jarrell: >cheduled on February 8 and 10, 2011 judgment, FILE kt and Natural Resources- 11ity Dee Freeman Secretary 11 with the facility'scontract lab) that will be e a a w Fw. t. . cw, v,wa ara.. wo,,...w — y— — a..., — ,....., .,.,.,.,.,.........., — report„ please do not hesitate to contact Mr. Lesley or me at (704) 663-189. Sincerely, x, t Robert B. Krebs Regional Supervisor Surface Water Protection Enclosure cc: Central Files Susan Meadows, Aquatic Toxicology Unit Mecklenburg County Water Quality Protection Mailing Address Phone (704) 663-1699 Location 1 One la arci 610 East Center Avenue, Suite 301 Fax (704) 663-6040 610'East Center Avenue, Suite 301 v111XfI Mooresville, NC 28115 Mooresville, North Carolina Internet. www.ncwaterqualitv.orP- Customer Service 1-877-62 -6748 An Equal Opportunity/Affirmative Action Employer— 50% Recycledt10% Past Consumer Paper iit No. NCO030210 3-Broad Cerodephnia dubia pass/fail tration 90% sample Fail * ivai 100% i Reproduction 20.3 neonates ,nt Survival 66% can Reproduction 16.1 neonates H 7.27 S Conductivity 488 micromhos/cm Total Residual Chlorine <0.1 fl pie pH 7.31 SU pie Conductivity 491 micromhos/cm pie Total Residual Chlorine <0.1 nag/I *Test results for these samples are inconclusive and were not used for compliance judgment.