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NCS000546_MRO Copy Monitoring Report_20210423V.ENERGY APk 2 3 2021 Allen Steam Station 253 Plant Allen Rd. ucNte-DEMLR Belmont, NC 28012 16O 704 829-2587 sail�uRegio aliiOffiice April 20, 2021 NCDEQ, Mooresville Regional Office Attn: DEMLR Stormwater Program 610 East Center Ave., Suite 301 Mooresville, N.C. 28115 Subject: Duke Energy Carolinas, LLC NPDES Storm Water Discharge Monitoring Report for: Allen Steam Station — NCS000546 — Gaston County In accordance with Part III, E(2) of the above referenced NPDES Storm Water permit, the original and one copy of the monthly monitoring reports are attached. The samples collected are required monthly due to Tier Two or Tier Three Status. The period for sampling ended March 31, 2021. Samples were collected for the period at outfalls SWO07, SWO09, SWO10, SW013-10, SWO16, SWO18 and SW020 on March 16, 2021. The laboratory analysis results were received on March 31, 2021. Duke Energy has performed the steps required by the Tier II and Tier III for these outfalls. There were no samples collected at outfalls SWO01 and SWO13-13 for the period, due to No Qualifying Flow condition. Outfall SWO03 was sampled on March 16, 2021 and the analysis results are included on this DMR. This DMR also contains the NO FLOW status of outfalls during the period of January 1, 2021 through March 31, 2021. Analytes sampled above the benchmark values for analytical monitoring are as follows. Outfall Parameter Result Benchmark SWO07 Zinc 0.168 mg/L 0.126 mg/L SWO10 Copper 0.015 mg/L 0.010 mg/L SWO10 TSS 140 mg/L 100 mg/L All values reported on the attached reports are dependent on the accuracy of approved analytical methods used to measure parameters. Please direct any correspondence or questions concerning the Allen Steam Station NPDES Storm Water Program to Elizabeth Glenn (980) 373-0530 or Randy Gantt (704) 829-2587. Yours truly, Rick R. Roper, General Manager III Allen Steam Station Duke Energy Carolinas, LLC Attachments bc: w/attachment Elizabeth Glenn UPS Tracking: 1Z X67 601 42 9312 3387 O A -rip 2 Lan ilOore: C EN LR rali S °ction offic, 00 � � N N � R a U � u W � �aAa: of ° z C�j W U O z w as zoo O z �z� a way M iU O � O o o U F E o 0 v 0v 0 0 0 0 a Ci R e�0 •� O O O O � � O O O O oa�FE v Oo0 v v v o v Oo0 v v v NO � Pa "w]•+,i x O x O O O x x x O '�' x �" x 0 0 0 oaa� E aac Uccoaa�vaa aaccc � aF4ai°`ai,y��aaia�aaiaa�4��� N•� O vQ d'dd'�--�Q'0�--�Md�d�d�•-iC�dd�d�d�N00 zzozovoozzz ozz zzoo o O;; ti ti ti ti h ti O ti ti o v v x A A A A A A A A x A A ZOO O 000 OOFOO O 99 O 04 F W �aaoa000aaaoaa�'aagoo WNW N N N W w W N W W W w N N N c >,., WWWoW000WWWoWWWWW000 cadFFF � xxxox000xxxoxxxxx000 xxx vF. a v v vFFF xxx vFFFFF axxxa v v v coo O coo o00oo W Wr.� w wwW wwwww 333 3 333 33333 COO O O O O 00000 C a a a 04 *4 04 04 �4*40.4*40.4 o a zzz�z�00°Ozzz�zzzzz0O0O0° fj f7r L7r aaa a 04 04 0.4 *0 aaaaa 42,� aaa a aaa aaaaa 0000000000 14 000000 a e� z z z z z z z z z z z z z z z z z z z z AU � d z z z M z M M M z z z M z z z z z M M M O �•-i N M 7 � O O O O O O O O O O O O O O O O O O O O 33333333333333333333 O z C) O 0 0 U z E O z E a �a O F ® 00 to l� N N 00 N o N N E ® o 0 0 ® o F O ® O O H O b O O O O O v O F ~ � b❑ O O O G � M M o M® O® M M M® M M M M C � C b x x 0 xy 0 0 0 xi �i x o x x ►�" x O O O O O O �g vg4 vaag vg4g gg V V V -V -V N � N ajol M 0 0 zzz�zzQzzo�® 0 Oaa v� v w xAA A AAA AAxAA Foo 0 coo OOFOO oaa z aaa aaoa9 _ ww w ��wwwOww www O W W W o W o o 1-4 O O 0 o W W W W W W W WOO o F O O F F F O F F F F F®® O COO O O O O O O O O O w w w w w w w w www w 333 3 333 33333 � a�U`aaaaMa�°��aaa�aaaaa��® C7C7C70000C7CJ�CJC.7C7CJCJ000 z z z z z z Z Z z z z Z �-. ww w w www w www w `v�i M O^- �i aaa0 a0 aaaaa.NNOOO O PIZ O O O C 00 Orci Ci r� wM r/ r^I rM � rl N �I PI N N Av�UzzZMzMM�ZzzMZZZzzMMM ®_qNMITtf� o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o O o 0 Z 33333333333333333333 O O ® N N ® N O N O N O N M M M M M M z zzz wzz ®® �xAA A AAA Foo o Ooo aaa a aaa ° www w www C � � OOO O OOO ®v�tnU � OOOI�ONP°O`1�®00°; w w w w w w w zzz z zzz >0>0>4 EbM www w www �4 �4 �--4 aaa a aaa O�cr�000vri ZZZ�oZrV�° 4zz4 O. �1 rti wl r4 Z Z Z M Q �oaa1.4 o 0 0 0 0 0 0 0 0 0 0 0 ® 333333333333 oz C/�c cn Con crC/� "-4 00 r-( " 00 N N N N M M M M U U U U dd dd' N � aaaaa ,� zzwzz 0 0 �AAxAA ooHoo aazza 0 aa�aa W W W W W o � � aaaaa o Hb+-� W v 00000 kn ^co� � �33333 W w Go fzo (Tr U E000OO1A\zt- (AvU aaaaa wTo *4��� H aaa 0-0 0.0 00 a fr "� i `- 000OOGr�iv=i C E p i N N N Av�Uzzzz'z,MM� M M M M M �D 00 O i �a 3 3333333� 0 z0 o x a o a � ro ^C C kn � C 0 W o F o Z c) w a o O w O � 0 kn 0 H .� U ram+ A cis U CC oz (D Cl. O 1