SAMPLE COLLECTION DATE March 25, st Quarter SOUTH WATER PURIFICATION PLANT

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1 laboratory ACCREDITATION NUMBER: Page 1 of2 TEMPERATURE TURBIDITY THRESHOLD ODOR, STRAIGHT THRESHOLD ODOR, DECHLORINATED COLOR ph FREE CHLORINE RESIDUAL SATURATION INDEX, LANGELIER ALKALINITY, PHENOLPHTHALEIN ALKALINITY, TOTAL BROMIDE CHLORIDE FLUORIDE SULFATE HARDNESS CALCIUM MAGNESIUM POTASSIUM SODIUM SOLIDS, TOTAL DISSOLVED SOLIDS, TOTAL TOTAL ORGANIC CARBON OXYGEN DEMAND, CHEMICAL NITROGEN, AMMONIA NITROGEN, NITRATE NITROGEN, NITRITE NITROGEN, TOTAL KJELDAHL ORTHOPHOSPHATE PHOSPHATE, TOTAL CYANIDE, TOTAL RADIOACTIVITY, GROSS ALPHA RADIOACTIVITY, GROSS BETA * Federal/State Secondary MCLs SAMPLE COLLECTION DATE March 25, st Quarter IEPA DETERMINED STORET RAW OUTLETS "'DISTRIBUTION RAW OUTLETS "'DISTRIBUTION MCl AS NUMBER LAKE 73rd Streel 791h Sireet SOUTH LAKE North Central Central North C TT N.T.U *3 T.O.N Moldy 2 Aowery 2 Flowery 1 Chlorinous 1 Flowery 2 Vegetable 2 Vegetable 1 Chlorinous 1 Chlorinous *3 T.O.N. 2 Moldy 1 Musty 1 Musty 1 Musty 1 Musty 1 Musty 1 Musty 1 Musty 1 Musty *15 Pt.-Co. Units ' STD. Units CL 2, mg/l ND UNITS CaC03, mg/l Br, mg/l NA NA NA NA NA NA NA NA NA *250 CI, mg/l F, mg/l *250 S04, mg/l CaC03, mg/l Ca, mg/l Mg, mg/l K, mg/l Na, mg/l *500 TDS, mg/l Tot. Sol., mg/l NPOC, mg/l , mg/l <5 <5 <5 8.8 <5 <5 < N, mg/l <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 < N,mg/L N, mg/l <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 N, mg/l NA NA NA NA NA NA NA NA NA P04, mg/l < P04, mg/l CN, ug/l <5 <5 <5 <5 <5 <5 <5 <5 <5 15 pci/l <1 <1 <1 1.2 <1 <1 <1 < pcill ** Action Level ***Dlstrlbutlon samples are composlted. ND - non detected NA - not available..j - Reported value is an estimate because Laboratory Fortified Matrix (LFM) did not meet QC acceptance criteria.

2 Page 2 of 2 SAMPLE COLLECTION DATE' March st Quarter IEPA DETERMINED STORET RAW OUTLETS '''DISTRIBUTION RAW OUTLETS "'DISTRIBUTION MCL AS NUMBER LAKE 73rd Street 79th Street South LAKE North Central Central North ALUMINUM ") * AI.1J9/L ANTIMONY 6 Sb.lJg/L <1 <1 <1 <1 <1 <1 <1 <1 <1 ARSENIC 10 AS.1J9/L <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 <1.3 BARIUM 2000 Ba. ljg/l BERYLLIUM 4 Be.lJg/L <1 <1 <1 <1 <1 <1 <1 <1 <1 BORON B.1J9/L CADMIUM 5 Cd.1J91L <1 <1 <1 <1 <1 <1 <1 <1 <1 CHROMIUM 100 Cr. 1J9/L COBALT CO. ljg/l <1 <1 <1 <1 <1 <1 <1 <1 <1 COPPER "1300 CU.1J9/L <1 <1 <1 <1 <1 <1 <1 <1 <1 IRON '300 Fe.lJg/L <4 < <4 < LEAD "15.0 Pb.lJg/L <1 <1 <1 <1 <1 <1 <1 <1 <1 LITHIUM Li. 1J9/L MANGANESE '50 Mn.1J9/L <1 <1 <1 <1 <1 <1 <1 < MERCURY 2 Hg.1J9/L <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 MOLYBDENUM Mo. 1J9/L <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 NICKEL Ni.1J9/L SELENIUM 50 Se.lJg/L <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 SILICON Si. 1J9/L SILVER '100 Ag. 1J9/L <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 STRONTIUM Sr. 1J9/L THALLIUM 2 TI.lJg/L <1 <1 <1 <1 <1 <1 <1 <1 <1 TITANIUM Ti.1J9/L <5 <5 <5 <5 <5 <5 <5 <5 <5 VANADIUM V.1J9/L <12 <12 <12 <12 <12 <12 <12 <12 <12 ZINC '5000 Zn.lJg/L <4 <4 < <4 <4 < * Federal/State Secondary MCl " Action level "'Distribution samples are composited. ND - not detected NA - not available 1?,...w, b~ ~ - Holding Time exceeded O/S - Out of Service TT - Treatment Technique ~->.J!fk. CHIEF WATER CHEMIST DIRECTOR OF laboratories MANAGER OF WATER QUALITY DEPUTY COMMISSIONER

3 Page 1 of 2 TEMPERATURE TURBIDITY THRESHOLD ODOR, STRAIGHT THRESHOLD ODOR, DECHLORINATED COLOR ph FREE CHLORINE RESIDUAL SATURATION INDEX, LANGELIER ALKALINITY, PHENOLPHTHALEIN ALKALINITY, TOTAL BROMIDE CHLORIDE FLUORIDE SULFATE HARDNESS CALCIUM MAGNESIUM POTASSIUM SODIUM SOLIDS, TOTAL DISSOLVED SOLIDS, TOTAL TOTAL ORGANIC CARBON OXYGEN DEMAND, CHEMICAL NITROGEN, AMMONIA NITROGEN, NITRATE NITROGEN, NITRITE NITROGEN, TOTAL KJELDAHL ORTHOPHOSPHATE PHOSPHATE, TOTAL CYANIDE, TOTAL RADIOACTIVITY, GROSS ALPHA RADIOACTIVITY, GROSS BETA * Federal/State Secondary MCLs SAMPLE COLLECTION DATE' June 24, nd Quarter IEPA DETERMINED STORET RAW OUTLETS "DISTRIBUTION RAW OUTLETS """DISTRIBUTION MCL AS NUMBER LAKE 73rd Street 79th Street SOUTH LAKE North Central Central North DC n N.T.U "3 T.O.N Ep 2Cc 2E 1 A 30s 1G 1 E 2Cc 2Cc "3 T.O.N. 1M NO 1 M NO 1M NO NO 1 M 1 M "15 P1.-Co. Units * STD. Units CL 2, mg/l UNITS +/ CaC03, mg/l Br, mg/l <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 "250 CI, mg/l F, mg/l "250 S04, mg/l CaC03, mg/l Ca, mg/l Mg, mg/l K, mg/l Na, mg/l "500 TOS, mg/l Tot. Sol., mg/l TOC, mg/l O/S O/S O/S O/S O/S O/S O/S O/S O/S O,mg/L <5 <5 <5 5.7 <5 <5 <5 <5 <5 N, mg/l N, mg/l N, mg/l <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 N, mg/l NA NA NA NA NA NA NA NA NA P04, mg/l P04, mg/l CN, ug/l <5 <5 <5 <5 <5 <5 <5 <5 <5 15 pcill <1 <1 <1 <1 <1 <1 <1 <1 <1 50 pcill <1 3.6 "" Action Level """Distribution samples are composited. ND - non detected NA - not available

4 Page 2 of 2 ALUMINUM ANTIMONY ARSENIC BARIUM BERYLLIUM BORON CADMIUM CHROMIUM COBALT COPPER IRON LEAD LITHIUM MANGANESE MERCURY MOLYBDENUM NICKEL SELENIUM SILICON SILVER STRONTIUM THALLIUM TITANIUM VANADIUM ZINC - FederallState Secondary MCL SAMPLE COLLECTION DATE' June 24, nd Quarter IEPA DETERMINED STORET RAW OUTLETS "'DISTRIBUTION RAW OUTLETS "*DISTRIBUTION MCL AS NUMBER LAKE 73rd Street 79th Street South LAKE North Central Central North * Al,llglL Sb,IlglL <1 <1 <1 <1 <1 <1 <1 <1 <1 10 AS,llglL Ba, IlglL Be,llg/L <1 <1 <1 <1 <1 <1 1 <1 <1 B,llglL Cd,IlglL <1 <1 <1 <1 <1 <1 1 <1 <1 100 Cr,IlglL Co, IlglL <1 <1 <1 <1 1.7 <1 1 <1 <1 **1300 Cu, IlglL <1 <1 <1 < <1 1 < *300 Fe,llg/L <5 <5 < <5 <5 < **15.0 Pb, IlglL <1 <1 <1 <1 <1 <1 1 <1 <1 Li, IlglL <2 <2 <2 <2 <2 <2 <2 <2 <2 *50 Mn, IlglL <5 <5 <5 <5 <5 <5 <5 <5 <5 2 Hg, IlglL <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 <0.2 Mo,llg/L <1 <1 <1 <1 <1 <1 1 <1 <1 Ni, Ilg/L <1 <1 < <1 <1 50 Se,IlglL <2 < < Si,IlglL *100 Ag,IlglL <2 <2 <2 <2 <2 <2 <2 <2 <2 Sr,IlglL TI,llglL <1 <1 <1 <1 <1 <1 1 <1 <1 Ti, IlglL <3 <3 <3 <3 <3 <3 <3 <3 <3 V, IlglL <1 <1 <1 <1 <1 <1 1 <1 <1 *5000 Zn, IlglL <5 <5 <5 <5 <5 <5 <5 < Action Level ---Distribution samples are composited. ND - not detected NA - not available ~ - Holding Time exceeded OIS - Out of Service TT - Treatment Technique CHIEF WATER CHEMIST DIRECTOR OF LABORATORIES MANAGER OF WATER QUALITY DEPUTY COMMISSIONER

5 Page 1 of 2 TEMPERATURE TURBIDITY THRESHOLD ODOR, STRAIGHT THRESHOLD OOOR, DECHLORINATED COLOR ph FREE CHLORINE RESIDUAL SATURATION INDEX, LANGELIER ALKALINITY, PHENOLPHTHALEIN ALKALINITY, TOTAL BROMIDE CHLORIDE FLUORIDE SULFATE HARDNESS CALCIUM MAGNESIUM POTASSIUM SODIUM SOLIDS, TOTAL DISSOLVED SOLIDS, TOTAL TOTAL ORGANIC CARBON OXYGEN DEMAND, CHEMICAL NITROGEN, AMMONIA NITROGEN, NITRATE NITROGEN, NITRITE NITROGEN, TOTAL KJELDAHL ORTHOPHOSPHATE PHOSPHATE, TOTAL CYANIDE, TOTAL RADIOACTIVITY, GROSS ALPHA RADIOACTIVITY, GROSS BET A Federal/State Secondary MCLs o SAMPLE C LLECTIO N DA TE : August 24, r do uarter IEPA DETERMINED STORET RAW OUTLETS """DISTRIBUTION RAW OUTLETS """DISTRIBUTION MCL AS NUMBER LAKE 73rd Street 79th Street SOUTH LAKE North Central Central North C TT N.T.U '3 T.O.N Cc 1 Cc 1 Cc 1 Cc 1 Cc 1 Cc 1 Cc 1 Cc 1 CC '3 T.O.N. 1M 1 M 1 M 1M 1M 1 M 1M 1 M 1M '15 Pt.-Co. Units H H H H H H H H H ' STD. Units CL 2, mg/l UNITS +/ CaC03, mg/l Br, mg/l H H H H H H H H H '250 CI, mg/l H H H H H H H H H 4 F, mg/l '250 S04, mg/l H H H H H H H H H CaC03, mg/l Ca, mg/l R R R R Mg, mg/l K, mg/l Na, mg/l '500 TOS, mg/l NA NA NA NA NA NA NA NA NA Tot. Sol., mgil NA NA NA NA NA NA NA NA NA TOG, mg/l O/S O/S OIS O/S O/S O/S O/S OIS O/S 0, mgll < <5 7.6 <5 <5 <5 <5 N, mgil H H H H H H H H H 10 N, mgll H H H H H H H H H 1 N, mg/l H H H H H H H H H N, mg/l O/S O/S O/S O/S O/S O/S O/S O/S O/S P04,mgIL < P04, mg/l < CN, ug/l <5 <5 <5 <5 <5 <5 <5 <5 <5 15 pcill <1 <1 <1 <1 <1 <1 <1 <1 <1 50 pcill <1 < <1 <1 1.5 Action Level ' Distribution samples are composited. NO - non detected NA - not available, analytical error R - Sample results not reported because certain QC criteria were not met.

6 Page 2 of 2 SA M PlE C Oll E C TI ONDA TE : August 24, r dq uarter SOUTH WATER PURIACATION PLANT IEPA DETERMINED STORET RAW OUTLETS --DISTRIBUT10N RAW OUTLETS DISTRIBUTION MCl AS NUMBER LAKE 73rd Street 79th Street South lake North Central Central North ALUMINUM AI, ~g/l ANTIMONY 6 Sb, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 ARSENIC 10 As, ~g/l BARIUM 2000 Ba, ~g/l BERYLLIUM 4 Be, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 BORON B, ~g/l CADMIUM 5 Cd, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 CHROMIUM 100 Cr, ~g/l < < COBALT Co, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 COPPER 1300 Cu, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 IRON 300 Fe, ~gll <5 <5 <5 <5 <5 < lead 15.0 Pb, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 LITHIUM Li, ~gil MANGANESE "50 Mn, ~g/l <2 <2 <2 <2 <2 <2 <2 <2 <2 MERCURY 2 Hg, ~g/l H H H H H H H H H MOLYBDENUM Mo, ~g/l NICKEL Ni, ~gil <2 <2 <2 <2 <2 <2 <2 <2 <2 SELENIUM 50 Se, ~g/l <2 <2 <2 <2 <2 <2 <2 <2 <2 SILICON Si, ~g/l SilVER 100 Ag, )J.g/L <1 <1 <1 <1 <1 <1 <1 <1 <1 STRONTIUM Sr, ~g/l THALLIUM 2 TI, ~g/l <1 <1 <1 <1 <1 <1 <1 <1 <1 TITANIUM Ti, ~g/l VANADIUM V, ~g/l ZINC "5000 Zn,~gIL <5 < R R R R R " FederallState Secondary MCl "" Action level 'Distribution samples are composited. ND - not detected NA - not available H - Holding Time exceeded OIS - Out of Service TT - Treatment Technique -R.~(A b~ L&" xl.at,/ac_ s=--!j CHIEF WATER CHEMIST DIRECTOR OF laboratories MANAGER OF WATER QUALITY DEPUTY COMMISSIONER