Memo
Date: February 3, 2000 EPA Region 5 Records Ctr.
224388 From: Barry Christian, Earth Tech
Subject: Illinois Central Spring Earth Tech Project Number 28522
On January 26, 2000, Britt Luther asked us to compute some parameters related to storm events at the Illinois Central Spring site in Bloomington. Indiana. These parameters included the following:
1. the peak flow rates produced by each of the three storm events; 2. the percent of PCB (i.e., TSS) removal with 2-acre and 4-acre feet of storage capacity under 2-year, 10-year and 25-year storm event conditions; 3. the total volume under the hydrograph for these three storm events; and 4. the total flow volume that bypasses the treatment system under each of the three storm events.
This memo and its attachments provide the information requested. The information requested is summarized in Table 1 of Attachment 1. An explanation of the work we performed to generate the infonnation for each of these four items is presented below.
Items 1 and 2
The first step in preparing this information for you was to define the 2-year and 10-year storm parameters based on the January 22, 1997 storm event. The 25-year storm event was previously defined. This first step resulted in the generation of two factors to scale up the flow rate, TSS concentration and PCB concentration from the January 22, 1997 storm event to the 2-year and 10-year storm events. Attachment 2 of this memo describes the scale-up factors and the methods and assumptions employed to calculate them. Attachment 2 consists of a memo from Aaron Volkening. The methods and assumptions employed to compute these parameters were the same as previously employed to define the 25-year storm event upon which the treatment system design is based.
The methods and assumptions previously employed are largely described in the following three documents: a memo from Barry Christian to Britt Luther dated December 10, 1998; a memo from Garth Greenan to Barry Christian dated December 18, 1998; and a report titled, Assumptions Employed in the Design of the ICS Facility..." published by Earth Tech in April 1999.
The second step in preparing this infonnation was to use the scale up factors (described in Attachment 2) to generate flow rates, TSS concentrations and PCB concentrations for the 2-year and 10-year storm events. Peak flow rates for the 2-year and 10-year storm events (item 1. above) came from completing this step. Infonnation generated during this step was then used to compute the TSS and PCB recovery by
EARTH
INTERNATIONAL LTD COMPANY the treatment system during the 2-year and 10-year storm events assuming both 2-acre feet and 4-acre feet of storage capacity (item 2, above). The computations are included in the spreadsheets presented as Taibles 3 and 4 for the 2-year and 10-year storm events, respectively (see Attachment 1). For completeness, the computations for the 25-year event, which Earth Tech published in 1999 are included as Table 2 (see Attachment 1).
Items 3 and 4
Table 5 consists of a spreadsheet that defines the entire hydrograph for the January 22, 1997 storm event. Note that this was not previously done by Earth Tech. The methods and assumptions used to define the entire hydrograph are described in Aaron Volkening's memo included in Attachment 2. The entire hydrograph was then scaled up using the same scale-up factors previously described for the 2-year, 10- ye.ir and 25-year storms. The scaled-up hydrographs for these storm events are also presented in Table 5.
The spreadsheet itself is cumbersome. It will help a reader to understand that the spreadsheet is 12 pages in length, 3 pages deep and 4 pages wide. The total discharge volume from the spring and the total discharge volume that bypasses the treatment system for the three storm events are computed and displayed on pages 6, 9 and 12 of Table 5. They are also summarized in Table 1 of Attachment i.
EARTH
A tlfCO INTERNATIONAL LTD. COMPANY ATTACHMENT 1
iLA Table 1 Comparison of Storm Events Parameters and TSS Recovery for Three Storm Events and Various Storage Volumes
25-Year Storm 10- Year Storm 2 -Year Storm Storage Capacity Storage Capacity Storage Capacity Storm Parameters 2 Acre-Feet 4 Acre-Feet 2 Acre-Feet 4 Acre-Feet 2 Acre-Feet 4 Acre-Feet Multiplier Applied to January 1997 Hydrograph Data 2.958 2.958 2.342 2.342 1.806 1.806
Pounds TSS Generated 8008 8008 5020 5020 2985 2985 Pounds TSS Recovered Process+Storage) 3804 5603 3124 4249 2261 2838 'ercent TSS Recovery Process+Storage) 48 70 62 85 76 95 'eak Discharge During Event (GPM) 5403 5403 4278 4278 3299 3299 V Total Volume Under lydrograph (gallons) 17,300,000 13,700,000 10,600,000
Volume Bypassed (Untreated) 8,200,000 5,100,000 2,600,000 Table 2 Illinois Central Spring Storm Event Analysis and Process Design Parameters 25 Year Storm Event
Tim* January 22. 1997 Storm Event Parameters Rain Flow 1 PCB's TSS
Basis of Potal Flow] PCB TSS3 TSS Mass Cumulative Design Time Serial Date/Time Rain Rate Rate Concentration
L:Vwofk\28522\pro)admin\25yrstormevent PageloTS 02/02/2000 Table 2 Illinois Central Spring Storm Event Analysis and Process Design Parameters 25 Year Storm Event Time Model 25-Ytar Storm Parameters Flow PCB's TSS PCB TSS TSS Basis of nstantaneous Concentration CB Mass umulative Concentration Concentration SS Mass umulative Design Time Serial Date/Time Flow Rate Cumulative w/safety low Rate CB Mass Based on with 20% Safety low Rate SS Mass Period Number (gpm) Flow (gal) factor(ppb) (Ib/hr) Flow (Ib) Model (mg/L) Factor (mg/L) (Ibs/hr) low (Ibs.) SjorageiT lilig 01/22/1997,'0:OOS 471 28255 18 0.004 0.004 0 0 0 0 ilwilaStS »m 01/22/1997 1:00 540 60645 0 0.000 0.004 0 0 0 0 01/22/19972:00 611 97330 ' 20 0.006 0.010 0 0 0 0 01/22/19973:00 730 141132 0 0.000 0.010 0 0 0 0 01/22/1997 4:00 1029 202877 20 0.010 0.021 0 0 0 0 01/22/1997 5:00 1510 293463 0 0.000 0.021 0 0 0 0 jgSBrOCfSBMft 01/22M997-.6:001 2116 420450 64 0.068 0.089 35 43 45 45 %'QMm$mM 01/22/1997 7:00 2936 596581 46 0.068 0.157 231 279 410 455 01/22/19978:00 3424 802014 64 0.110 0.267 325 393 674 1129 01/22/19979:00 4018 1043068 429 0.862 1.130 414 500 1006 2135 01/22/1997 10:00 5318 1362141 429 1.141 2.271 414 500 1332 3466 01/22/1997 11:00 5403 1686326 607 1.643 3.914 325 393 1063 4529 01/22/1997 12:00 5279 2003093 182 0.482 4.396 . 151 182 482 5011 01/22/1997 13:00 5224 2316522 264 0.691 5.087 254 307 804 5814 01/22/1997 14:00 5296 2634282 225 0.597 5.684 169 204 540 6354 01/22/1997 15:00 5283 2951244 136 0.359 6.043 130 157 416 6770 01/22/1997 16:00 5302 3269341 157 0.417 6.460 104 125 332 7102 '01/22/1997 17:00* 5256 3584688 125 0.329 6.789 89 107 282 7384 WsgBf; DMftrfiStooSS 01/22/1997 18:00 5182 3895615 136 0.352 7.141 24 29 74 7458 01/22/1997 19:00 5072 4199940 93 0.236 7.377 9 11 27 7485 01/22/1997 20:00 4886 4493119 107 0.262 7.639 18 21 52 7538 01/22/199721:00 4810 4781737 61 0.146 7.786 21 25 60 7598 01/22/1997 22:00 4671 5062014 57 0.134 7.919 18 21 50 7648 01/22/199723:00 4507 5332458 39 0.089 8.008 21 25 56 7705 01/23/1997 0:00 4459 5600009 57 0.128 8.136 18 21 48 7752 01/23/1997 1:00 4335 5860123 35 0.077 8.212 6 7 16 7768 01/23/1997 2:00 4225 6113618 31 0.065 8.277 44 54 113 7881 01/23/1997 3:00 4118 6360688 32 0.066 8.343 0 0 0 7881 01/23/1997 4:00 4027 6602309 46 0.094 8.437 6 7 14 7896 01/23/1997 5:00 3907 6836707 23 0.045 8.482 0 0 0 7896 01/23/1997 6:00 3801 7064769 24 0.046 8.528 21 25 48 7943 01/23/19977:00 3675 7285270 23 0.042 8.570 12 14 26 7970 &«°iSgga" H01723/.1 997:8:00!| 3578 7499968 15 0.026 8.597 18 21 38 8008 "RPPH^a^HiBKH 01/23/1997 9:00 3495 7709642 0 0.000 8.597 0 0 0 8008 01/23/1997 10:00 3435 7915750 0 0.000 8.597 0 0 0 8008 01/23/1997 11:00- 3377 8118379 0 0.000 8.597 0 0 0 8008 01/23/1997 12:00 3320 8317565 11 0.019 8.616 0 0 0 8008 Footnotes 1. gpm - gallons per minute. 2. ppb • parts per billion. 3. TSS - Total Suspended Solids. 4. Values based on process TSS capture for entire storm event (1739 Ib.) plus cumulative TSS captured In storage.
L:\worW28522\proJadmln\25yrstofmevent Page 2 o(5 02/02/2000 Table 2 Illinois Central Spring Storm Event Analysis and Process Design Parameter. 25 Year Storm Event Time Treatment Process at 1000 apm Capacity Flow TSS
Basis of Flow Rate to Cumulative Percentage of Cumulative TSS f'ercentage of TSS Design Time Serial Date/Time Process Flow to Total Flow to TSS Mass Flow Removed by Removed by Period Number (gpm) Process (gal) Process (%) to Process (Ib/hr) Process (Ibs.) Process(%) £toraga/Tanfc> )1/22/1997'0;00| 471 28255 0.34 0 0 0 •^rj-eslftnTsSn^ 01/22/1997 1:00 540 60645 0.73 0 0 0 01/22/1997 2:00 611 97330 1.17 0 0 0 01/22/19973:00 730 141132 1.70 0 0 0 01/22/1997 4:00 1000 201132 2.42 0 0 0 01/22/1997 5:00 1000 261132 3.14 0 0 0 1 A& - Proc6ft&£ii 01/22/1997=6:00? 1000 321132 3.86 21.5 21.5 0.3 01/22/1997 7:00 1000 381132 4.58 139.5 161.0 2.0 01/22/19978:00 1000 441132 5.30 196.7 357.7 4.5 01/22/1997 9:00 1000 501132 6.02 250.4 608.1 7.6 01/22/1997 10:00 1000 561132 6.75 250.4 858.5 10.7 01/22/1997 11:00 1000 621132 7.47 196.7 1055.3 13.2 01/22/1997 12:00 1000 681132 8.19 91.2 1146.5 14.3 01/22/1997 13:00 1000 741132 8.91 153.8 1300.3 16.2 01/22/1997 14:00 1000 801132 9.63 102.0 1402.3 17.5 01/22/1997 15:00 1000 861132 10.35 78.7 1481.0 18.5 01/22/1997 16:00 1000 921132 11.07 62.6 1543.6 19.3 & Process^ !01/22/1997il7:00* 1000 981132 11.80 53.7 1597.2 19.9 1 Desian-Stopt 01/22/1997 18:00 1000 1041132 12.52 14.3 1611.5 20.1 01/22/1997 19:00 1000 1101132 13.24 5.4 1616.9 20.2 01/22/199720:00 1000 1161132 13.96 10.7 1627.6 20.3 01/22/199721:00 1000 1221132 14.68 12.5 1640.2 20.5 01/22/199722:00 1000 1281132 15.40 10.7 1650.9 20.6 01/22/1997 23:00 1000 1341132 16.12 12.5 1663.4 20.8 01/23/19970:00 1000 1401132 16.85 10.7 1674.2 20.9 01/23/1997 1:00 1000 1461132 17.57 3.6 1677.7 21.0 01/23/19972:00 1000 1521132 18.29 26.8 1704.6 21.3 01/23/19973:00 1000 1581132 19.01 0.0 1704.6 21.3 01/23/19974:00 1000 1641132 19.73 3.6 1708.1 21.3 01/23/19975:00 1000 1701132 20.45 0.0 1708.1 21.3 01/23/1997 6:00 I 1000 1761132 21.17 12.5 1720.7 21.5 01/23/1997 7:00 I 1000 1821132 21.90 7.2 1727.8 21.6 'Storaagar^ 1 01/23/.l99W8fflO»l 1000 1881132 22.62 10.7 1738.5 21.7 \ 01/23/19979:00 1 1000 1941132 23.34 0 1738.5 21.7 01/23/1997 10:00 1000 2001132 24;06 0 1738.5 21.7 01/23/199711:00 1000 2061132 24.78 0 1738.5 21.7 01/23/1997 12:OC I 1000 2121132 25.50 0 1738.5 21.7 -BSHHSU" ~ " rgpm""gallonspefmlriufe. 2. ppb - parts per billion. 3. TSS - Total Suspended Solids.
L:\worM28522\pfqadmln\25yrstofmevent Pa» 3 of 5 02/02/2000 TabteJ Illlaol* Cmtral Sprint Storm Cvmt Aaary* and ProcaN Daafei PtnMttn 29 Ytar Storm Evtnt TIlM •UtfMMTM Vj^miwwl wmvfiBnaia^* TtlCMtura* Flow T»8 FlowRalato Cumulattva Battaof toraga (gpn -In Sum of ProoMi PWCtfltAQt Of T8S Matt Flow TSSCoNactod trcanlaoaTM Sum of ProMM andStoraea DaalgnThna Sana) Dala/Tlma axoaaioflOOO Cumutattva Flow Total Flow to Rtfc to Storaga byStoraga CollacMdby Parcanlag* 88 rPMrifu wmui NUfTw9f gpm) andSloregaU toStorega(oaO Storaga (%)
LAwortA28522\proji&nln\2Synlomwvtnt P«gt4eT6 021020000 € € Illinois Central Spring Storm Event Analysis and Process Design Parameters
Assumptions Affecting 25-Year Storm Event Spreadsheet 1. The hydrograph data from the January 22,1997 storm event were used as the basis for predicting the storm parameters for the model 25-year, 6- hour storm event. 2. The ratio of storm event flow rates for the January 22,1997 event and the model 25-year storm event (2.96) was used as a direct multiplier to scale up TSS and PCB concentrations from the 1997 storm to the model storm. 3. The safety factor used for the PCB and TSS concentration is 500 mg/L (an arbitrary maximum concentration) over 414 mg/L (the maximum TSS concentration based on the model) which is 21%. ' 4. Percentage of TSS capture assumes that no settling occurs and that storage tank feed pumps are turned off after the tanks are full. The fact that the "Cumulative flow to storage" column continues to accumulate after the storage tanks are full (1.3 million gallons) can be ignored. 5. The computation contained in this spreadsheet does not account for the potential separation of spring flow from runoff in Earth Tech's design.
Importan1 t Conclusions Derived from 25-Year Storm Event Spreadsheet ^ ™ •••••• -™" ™ ¥•••• • ^^^K^B^K^bB •• -mm r.v- ^ ,f 1. Average TSS concentration for the 12-hour peak TSS time period is 267 mg/L. [(43+279+393+500+500+393+182+307+204+157+125+107)/12]. 2. Total mass of TSS that will flow out of the ICS during the storm event is 8008 Ib. """ j ? 3. Total flow of water out of the ICS is 7,500,000 gallons during the storm event period of time when TSS concentration is >1 mg/L. If 4. Treatment process removes 1739 of 8008 Ibs. TSS. or 21.7% of total. f 5. Storage captures at least 3864 of 8008 Ibs. TSS, or 48.3% of total. If settling occurs in the storage tanks, the percentage may be higher. |j 6. Total mass of TSS captured and treated is at least 5603 of 8008 Ibs., or 70% (21.7% + 48.3%). ' -| 7.70% capture of total TSS is based on pumping 1,321,960 gallons of storm water to storage. \
L:\worV\28522\projadmin\25yrstormevent Page 1 of 5 02/02/2000 Table 3 Illlaob Cemral Spring Storm tvnt Analytto and Proceai Dodp
hne — -J •Ii itlf •wrm Hvem para«MMr> Rain [-•„ >>•" Flow M*. Baaleof Total Flow PCS T8S1 OetlonTlme Serial Dale/Time Rain Rale Rale TSSMaaa Cumulative rwfiOftairinrQt Concentration Flow Rate Number (in) (OP*"') 1 TSSMaaa (PPb ) (moA) (tome) Flow (to) tJM/22/IOOafcOO tr 169,2 VOMHB 01/22/1007 1:00 0 0 •0* 1828 0 0 01/22/1997 2:00 0 0 TJ.05 208,7 8.8 0 01/22/1997 3:00 0 0 0.02 246.8 0 0 01/22/19974:00 0 0 0.12 347.0 8.7 0 01/22/1997 8:00 0 0 0,02 810,4 0 0 ' Proeeii* *Ol/32/1997,6:00 0 0 0,06 718,8 18 12 01/22/1007 7:00 4 4 0,08 0024 13 78 01/22/1007 8:00 39 43 022 1187.5 18 110 01/22/1007 0:00 64 107 0,23 1358,2 120 140 01/22/1007 10:00 98 202 004 1707,8 120 140 01/22/199711:00 126 328 •V 18268 170 110 01/22/1997 12:00 101 429 •v 1784.8 61 81 01/22/1997 13:00 46 474 •v 1766.0 74 66 01/22/1907 14:00 •v 76 550 1700,4 63 57 01 01/22/1007 15:00 •v 1785.0 601 36 44 39 641 01/22/1097 16:00 •v 1702,3 44 38 31 672 101/22/1 997i17flO •0" 1776.8 38 30 27 699 01/22/1997 18:00 •v 1751.0 38 8 7 706 01/22/1997 19:00 tr 1714,7 26 3 3 708 01/22/1997 20:00 •or 1681.0 30 6 5 713 01/22/199721:00 •0" 1626.2 17 7 6 719 01/22/1997 22:00 •o- 1670.2 16 6 6 724 01/22/1997 23:00 •o- 1523,8 11 7 8 7J9 ~ 01/23/19970:00 •Or 1507.5 18 6 01/23/1997 1:00 8 734 •o- 1485.6 0.0 2 01/23/1997 2 '00 1 m •o* 1428,3 8,6 16 11 01/23/1997 3:00 "0" >4e - 1302.1 8.0 0 0 01/23/1997 4:00 •0" 1381.4 >4d 13 2 1 747 01/23/1997 8:00 •0" 1320,7 6.5 0 OJ/M/1997 6;M "0" 0 747 • 1288,0 e.6 ' « 7U 01/23/1997 7:00 •0" 1242,4 6.4 4 • •0" 784 JttyiliMiBMOii 1209,7 4.1 ^t~= 01/23/10079:00 ~~~r — 7U •0" 1181,4 0 5 - "~T " 7U - 01/23/1007 10:00 •o- 1161.3 0 0 " 01/23/1997 11:00 "0" 5 — 788 — 1141.7 0 0 01/23/1007 12:00 "0" 0 788 iTfz.s I 3.2 0 i-nntnntM !=xxm«^^^Hi^^_ 6 ' 758 ™ 1.Qpm-giiltont per rr Inuta. -^ 2. ppb • partt par bllllo«. S.TSS-T. i oo • ci>ta owl Suua suspendendadd Solid Soltdi* . 4£ttyttl£S*m for 'nttr-ltofm ""(137fl ^plul
02/020000 Table 3 Illinois Central Spring Storm Event Analysis and Process Design Parameters 10 Year Storm Event Time Model 10-Year Storm Parameters Flow PCB'a TSS PCB TSS TSS Instantaneous! I Concentration PCB Mass Cumulative Concentration Concentration TSS Mass Cumulative Flow Rate Cumulative w/safety Row Rate PCB Mass Based on with 20% Safety Flow Rate TSi> Mass (gpm) Flow (gal) I factor (ppb) (Ib/hr) Flow (Ib) Model (mg/L) Factor (mg/L) (Ibs/hr) Flow (Ibs.) 373 22371 14 0.003 0.003 0 427 48016 0.000 0.003 0 484 77061 16 0.004 0.006 578 111742 0.000 0.006 815 160628 16 0.007 0.013 1195 232350 0.000 0.013 1676 332892 51 0.043 0.056 28 34 28 28 2324 472344 37 0.043 0.099 183 221 257 285 2711 634996 51 0.069 0.168 258 311 422 707 3181 825850 339 0.541 0.708 328 396 631 1338 4240 1078477 339 0.716 1.424 328 396 835 2173 4278 1335151 481 1.030 2.454 258 311 666 2839 4180 1585951 144 0.302 2.755 119 144 302 3141 4136 1834109 209 0.433 3.189 201 243 504 3645 4193 2085696 178 0.374 3.563 133 161 338 3983 4183 2336651 107 0.225 3.788 103 124 261 4244 4198 2588505 124 0.262 4.050 82 99 208 4452 4161 2838181 99 0.206 4.256 70 85 177 4629 4103 3084358 107 0.221 4.477 19 23 46 4675 4016 3325307 74 0.148 4.625 17 4692 3869 3557432 85 0.164 4.789 14 17 33 4725 3809 3785946 48 0.092 4.881 16 20 38 4763 3698 4007855 45 0.084 4.964 14 17 31 4794 3569 4221980 31 0.056 5.020 16 20 35 4830 ft," 3531 4433814 45 0.080 5.100 14 17 30 4860 3432 4639760 28 0.048 5.148 10 4870 3345 4840464 24 0,041 5.189 35 42 71 4941 3260 5036082 25 0.041 5.230 4941 3188 5227386 37 0.059 5.289 4950 3093 5412971 18 0.028 5.317 4950 3009 5593539 19 0.029 5.346 16 20 30 4979 2910 5768121 18 0.026 5.372 11 16 4996 -2833- -5938108^ 0:016 5.389 14" 17 24 5020 2767 6104119 0.000 5.389 5020 2720 6267304 0.000 5.389 5020 2674 6427736 0.000 5.389 5020 2628 6585442 9 0.012 5.401 5020 r: gprft - gallons 2. ppb - parts per billion. 3. TSS - Total Suspended Solids. 4. Values based on process TSS capture for entire storm event (1376 Ib.) plus cumulative TSS captured in storage.
L:\wortt\28522\prpjadmin\l Oyrstormevent Pag* 2 of 5 02/02/2000 TabU 3 Illlaols Ctfttrtl Sprlai Storm EVM< Analyst art Proeass Dasita Para 10 Yaar Storm EvtHt _Tfaatmart Prooatsat1000 OPfli CaoaeHv Flow —W
Basis of FtowMatato Cumuiatlva Cumulattva TM PafcantagaofTU DaslgriTlma Sartal Dala/Tlma I Procats Flow to Total Flow lo T88 Mass Flow Rwwv^d by Ramovadby Precast (pal) Procats (%) to Procass (Ib/hr) Prooass (fca.) PiocasK*) pj/ntttraaoM 0,94 0 01/22/1097 1:00 0,73 0 01/22/1997 1,17 0 01/22/19973:00 1,70 0 01/22/1997 4:00 2.44 01/22/1997 5.00 Z32380 3,63 __ 292380 4744" 17,0 17,0 0.3 01/22/19977:00 352350 535 110.5 127,5 01/22/19978:00 412380 155.6 283.2 01/22/1997 9:00 472360 7,17 198,3 481.8 01/22/1997 10:00 532380 808 198.3 679.7 01/22/199711,00 592350 155.8 838.5 01/22/1997 12:00 652380 9.91 72.2 907^ 01/22/1997 13:00 712350 10.82 1218 1029.6 01/22/1997 14:00 772350 11.73 60.7 1110.3 22.1 01/22/1997 15:00 832350 12,64 62.3 1172.* 23,4^ 01/22/1997 16:00 892350 13.56 49,6 1222.1 952350 14,46 42.6 1264.9 01/22/1997 18:00 1012350 15.37 113 1275,9 01/22/1997 10:00 1072350 16.26 4.2 12872 26.5 01/22/1997 20:00 1132350 17.19 8.5 1266.7 01/22/1997 21:00 1192350 18.11 9.9 1298.6 26.9 01/22/1997 22:00 1252350 19.02 6.6 130T1 01/22/1997 23:00 1312350 19.93 9.9 13T77 01/23/1997 0:00 13723(KT 20.64 6.8 01/23/1997 1:00 1432350" 21.75 2.6 1326,3 26.5 01/23/1997 2:00 1492350 22.66 21,2 1349.1 01/23/1997 3:00 1552357 23,57 01T 1349,6 01/23/1997 4:66 1812350 24.48 2.8 1352.4 26,9 01/23/1997 8:00 16735ST 25.39 0,0 1352.4 01/23/1997 6:00 1732350 26.31 1362.3 1792350 27.22 5.7 1368.0 27.3 1682360 28.13 8,5 1376.9 01/23/1997 9:00 1912350 29,04 1376.8 27,4 01/23/199710:0 1972350 29,98 1376.8 01/23/1997 20313507 30.66 i3?6,8 TTT 01/23/199712:00 2092757 31.77 137O 27.4 1. opm • gallons par mlnuta. 2. ppb • parts par billion. 3. T38 • Total Sutpandad Solids. 4. Valuas basad on precast T8S capture for antira storm avant (1376 (b.) plus cumulatlva T88 capturad In storaga.
L:\woriC\2S522\projadmm\10yratornMvwil PagiSofS 0210212000 Table 3 Illinois Central Spring Storm Event Analysis and Process Design Parameters 10 Year Storm Event Time Storage Tank System Total System TSS Capture4 Flow TSS Flow Rate to Cumulative Sum of Process ; Basis of Storage (gpm - in Percentage of TSS Mass Flow TSS Collected Percentage TSS Sum of Process and Storage Design Time Serial Date/Time excess of 1000 Cumulative Flow Total Flow to Rate to Storage by Storage Collected by and Storage SS Percentage SS Period Number gpm) o Storage (gal) Storage (%) (Ib/hr) (Ibs.) Storage (%) Capture (Ibs.) Capture (%) StorBgs^Tank'i :01/22/1997 0:00; 0 0 0.0 0 0 0 1376 27 •WiW&Sttfife 01/22/1997 1:00 0 0 0.0 0 0 0 1376 27 01/22/19972:00 0 0 o.d 0 0 0 1376 27 01/22/1997 3:00 0 0 0.0 0 0 0 1376 27 01/22/19974:00 0 0 0.0 0 0 0 1376 27 01/22/19975:00 195 11721 0.2 0 0 0 1376 27 :.','"Processi? •01/22/19976:00 676 52263 0.8 11.5 11.5 0.2 1388 28 '•PWKWSH 01/22/19977:00 1324 131716 2.0 146.3 157.8 3.1 1534 31 01/22/1997 8:00 1711 234367 3.6 266.5 424.3 8.5 1801 36 01/22/19979:00 2181 365222 5.5 432.4 856.7 17.1 2233 44 01/22/1997 10:00 3210 557849 8.5 636.5 1493.2 29.7 2870 :,57 01/22/1997 11:00 3278 754522 11.5 510.6 2003.8 39.9 3380 67 01/22/1997 12:00 3180 945322 14.4 229.7 2233.4 44.5 3610 72 01/22/1997 13:00 3136 1133481 , 17.2 381.9 2615.4 52.1 3992 80 01/22/1997 14:00 3193 132506B r 20.1 257.7 2873.1 57.2 4250 85 01/22/1997 15:00 3183 1516022 23.0 198.3 3071.4 61.2 4448 89 01/22/1997 16:00 3198 1707876 25.9 158.5 3229.9 64.3 4606 92 ilfe^robess^ :01/22/1997J17:00 3161 1897552 28.8 134.3 3364.2 67.0 4741 94 ;-.oaiin$8uff 01/22/1997 18:00 3103 2083729 31.6 35.2 3399.4 67.7 4776 95 01/22/199719:00 3016 2264679 34.4 12.8 3412.2 68.0 4789 95 01/22/1997 20:00 2869 2436804 37.0 24,4 3436.6 68.5 4813 96 01/22/199721:00 2809 2605318 39.6 27.8 3464.4 69.0 4841 96 01/22/1997 22:00 2698 2767227 42.0 22.9 3487.3 69.5 4864 97 01/22/1997 23:00 2569 2921351 44.4 25.5 3512.8 70.0 4889 ,97 f4 01/23/1997 0:00 2531 3073185 46.7 21.5 3534.3 70.4 4911 U8 01/23/19971:00 2432 3219131 48.9 6.9 3541.2 70.5 4918 98 01/23/19972:00 2345 3359836 51.0 49.8 3591.0 71.5 4967 99 01/23/19973:00 2260 3495454 53.1 0.0 3591.0 71.5 4967 99 01/23/19974:00 2188 3626758 55.1 6.2 3597.2 71.7 4974 99 01/23/19975:00 2093 3752343 57.0 0.0 3597.2 71.7 4974 99 01/23/19976:00 2009 3872911 58.8 19.9 3617.1 72.1 4994 99 01/23/1997 7:00 1910 3987493 60.6 10.8 3627.9 72.3 5004 100 ; ^01/23/199758:00 1833 4097480 62.2 15.6 3643.5 72.6 5020 100 ll&iilSSjjj 5020 100 01/23/1997 10:00 1720 4306676 65.4 0.0 3643.5 72.6 5020 100 01/23/1997 11:OC 1674 4407108 66.9 0.0 3643.5 72.6 5020 100 01/23/1997 12:OC 1628 4504813 68.4 0.0 3643.5 72.6 5020 100 Footnotes 1. gpm - gallons per minute. 2. ppb - parts per billion. 3. TSS - Total Suspended Solids. 4. Values based on process TSS capture for entire storm event (1376 Ib.) plus cumulative TSS captured In storage.
L:\worti\28522\prpjadmlnMOyrstormevenl Page 4 o«5 02/02/2000 Illinois Central Spring Storm Event Analysis and Process Design Parameters
AMumtlona Affectin 10-Yaar Storm Evan* 1 . The hydrograph data from the January 22, 1097 storm event were used as the basis for predicting the storm parameters for the model 10-year, 6- hour storm event. 2. The ratio of storm event flow rates for the January 22, 1007 event and the model 10-year storm event (2.342) was used as a direct multiplier to scale up TSS and PCB concentrations from the 1007 storm to the model storm. 3. The safety factor used for the PCB and TSS concentration Is 500 mg/L (an arbitrary maximum concentration) over 414 mg/L (the maximum TSS concentration baded upon the model) which Is 21%. 4. Percentage of TSS capture assumes that no settling occurs and that storage tank feed pumps are turned off after the tanks are full. The fact that the "Cumulative flow to storage" column continues to accumulate after the storage tanks are full (1 .3 million gallons) can be Ignored.
5. The computation contained In this spreadsheet does not account for the potential separation of spring flow from runoff In Earth Tech's design.
Important ConctmtQM Darivad from ^Q.Y«ar Storm Evant 1. Average TSS concentration for the 12-hour peak TSS time period Is 210 mg/L, [(34+221+311+308+306+311+144+243+181+124+00+85)/12]. 2. Total mass of TSS that will flow out of the ICS during the storm event Is 5020 Ib. 3. Total flow of water out of the ICS Is 5,000,000 gallons during the storm event period of time when TSS concentration Is >1 mg/L. 4. Treatment process removes 1376 of 5020 Ibs. TSS, or 27.4% of total. 5. Storage captures at least 2873 of 5020 TSS, or 57.2% of total. If settling occurs In the storage tanks, the percentage may be higher. 6. Total mass of TSS captured and treated Is at least 4240 of 5020 Ibs., or 85% (27.4% + 57.2%). 7. 85% capture of total TSS Is based on pumping 1 ,325,088 gallons of storm water to storage.
L:\wofk\28522\projadmln\10yrstormevent ' Page 1 of 5 02/02/2000 Table 4 Illinois Central Spring Storm Event Analysis and Process Design Parameters 2 Year Storm Event
Time January 22. 1997 Storm Event Parameters | Rain Flow | PCB't TSS
Basis of T Otal Flow PCB TSS3 TSS Mass Cumulative 1 Design Time Serial Date/Time tain Rate Rate I Concentration x>ncentration Flow Rate TSS Mass 1 Period Number (in.) (gpm1) (ppb2) (mg/L) (Ib/hr) Flow (Ib) Istoraoi^raMSlf 01/22/1 997- 0:00 "0" 159.2 5.1 0 o 0 |'C&fiK»fiai 01/22/19971:00 •D" 182.5 0 0 Q 0 01/22/1997 2:00 0.05 206.7- 5.5 0 o 0 :01/22/1997 3:00 0.02 246.8 0 0 Q 0 01/22/1997 4:00 0.12 347.9 5.7 0 o 0 I 01/22/19975:00 0.02 510.4 0 0 o 0 I '^?I*5fi?iffiH?^ '^*99 ^;00; 0.06 715,5 18 12 4 4 01/22/1997 7:00 0.06 992.4 13 78 39 43 01/22/19978:00 0.22 1157.5 18 110 64 107 01/22/1997 9:00 0.23 1358.2 120 140 95 202 01/22/1997 10:00 0.04 1797.8 120 140 126 328 01/22/1997 11:00 "0" 1826.6 170 110 101 429 01/22/1997 12:00 "0" 1784.8 51 51 46 474 1 01/22/1997 13:00 "0" 1766.0 74 66 76 550 01/22/1997 14:00 •0" 1790.4 63 57 51 601 01/22/1997 15:00 "0- 1785.9 38 44 39 641 01/22/1997 16:00 "0" 1792,3 44 35 31 672 "0" 1776.8 35 30 27 699 sm^te^^i§o "0- 1751.9 38 8 7 706 01/22/1997 19:00 •0" 1714.7 26 3 3 708 01/22/1997 20:00 •0" 1651.9 30 6 5 713 01/22/199721:00 "0- 1626.2 17 7 6 719 01/22/1997 22:00 "0" 1579.2 16 6 5 724 01/22/1997 23:00 •0" 1523.8 11 7 5 729 01/23/1997 0:00 "o- 1507.5 16 6 5 734 01/23/19971:00 "0" 1465.6 9.9 2 1 735 01/23/19972:00 •0" 1428.3 8.6 15 11 746 01/23/19973:00 "0" 1392.1 8.9 0 0 746 01/23/19974:00 "0" 1361.4 13 2 1 747 01/23/19975:00 "0" 1320.7 6.5 o 0 747 01/23/19976:00 "0" 1285.0 6.8 7 5 752 01/23/1997 7:00 •0" 1242.4 6.4 4 2 754 .{,. 1209.7 4.1 6 4 758 ^SHSiJHBi^B^i^il N01/23/1997 9:00 "0- 1181.4 0 0 0 758 1 01/23/1997 10:0( •o- 1161.3 0 0 0 758 01/23/1997 11:0( "0- 1141.7 0 Q 0 758 01/23/1997 12:0 "0" 1122.3 3.2 o 0 758 1. gpm - gallons per minute. 2. ppb - parts per billion. 3. TSS -Total Suspended Solids. 4. Values based on process TSS capture (or entire storm event (1061 Ib.) plus cumulative TSS captured in storage. l:Vwort«eS2aprojadm!n\2yretom Tlnw Medal I'Yeef Worm Parameter Wow T PCra TM PCB T88 ™ Baili of nsiantaneous JortcentrsUon PCB Maaa :umulallva rfOnoantrauofl fS8 Matt L:Vworti\2e622\projidm!n\2yrttorm«v«nl PtQOoTS 02/01/2000 Table 4 Illinois Central Spring Storm Event Analysis and Process Design Parameters 2 Year Storm Event Treatment Process at 1000 qpm Capacity Flow TSS Flow Rate to Cumulative Percentage of Cumulative TSS ercentage of TSS Process Flow to Total Flow to TSS Mass Flow Removed by Removed by recess (gal) Process (%) to Process (Ib/tv) Process (Ibs.) Process(%) 17251 0.34 37027 0.73 59425 1.17 86168 1.70 123866 2.44 179173 3.53 239173 4.71 13.1 13.1 0.4 299173 5.89 85.2 98.3 3.3 359173 7.07 120.1 218.4 7.3 419173 8.25 152.9 371.3 12.4 479173 9.44 152.9 524.2 17.6 1000 539173 10.62 120.1 644.3 21.6 1000 599173 11.80 55.7 700.0 23.4 1000 659173 12.98 93.9 793.9 26.6 1000 719173 14.16 62.2 856.2 28.7 1000 779173 15.34 48.0 904.2 30.3 1000 839173 16.52 38.2 942.4 31.6 1000 899173 17.71 32.8 975.2 32.7 1000 959173 18.89 8.7 983.9 33.0 1000 1019173 20.07 3.3 987.2 33.1 1000 1079173 21.25 6.6 993.8 33.3 1000 1139173 22.43 7.6 1001.4 33.5 1000 1199173 23.61 6.6 1008.0 33.8 1000 1259173 24.80 7.6 1015.6 34.0 •38- 1000 1319173 25.98 6.6 1022.1 34.2 1000 1379173 27.16 2.2 1024.3 34.3 1000 1439173 28.34 16.4 1040.7 34.9 1000 1499173 29.52 0.0 1040.7 34.9 1000 1559173 30.70 2.2 1042.9 34.9 1000 1619173 31.88 0.0 1042.9 34.9 1000 1679173 33.07 7.6 1050.5 35.2 1000 1739173 34.25 4.4 1054.9 35.3 1000 1799173 35.43 6.6 1061.5 35.6 1000 1859173 36.61 1061.5 35.6 1000 1919173 37.79 1061.5 35.6 1000 1979173 38.97 0 1061.5 35.6 1000 2039173 40.15 1061.5 35.6 Footnotes' 1. gpm - gallons per minute. 2. ppb - parts per billion. 3. TSS • Total Suspended Solids. 4. Values based on process TSS capture for entire storm event (1061 Ib.) plus cumulative TSS captured in storage. L:\wofM28522\proiadmin\2yrBtormevent Page 5 of 5 02/01/2000 llllMb Ctalral Sprint Storm EVMI Amlytti aad Fracaai Da*l|§. PartMttn 2YMrStermEvtnl Tlmt ItoraoaTan Total •vatam Tti Caotura* TW FtowRalato Cumulallva Sum of Procaaa Baalaof toraga (gpm • In Parcanlagaof T8S Man Plow TMCoNaclad ParoantagaTU Sum of Prooaaa and Storaga DaalgnTlma Sarlal Dala/Tlma axoaaa of 1000 Cumuiattva Ftow Total Flow to >»— -i— -i Rata to Storage byStoraga CoNactadby andSloragaM Parcantaga 88 rvnoo Number gpm) to8toraga(gal) Storaga (%) (Ib/hr) (*a.) Storaga (%) Caplura (iba,) Caplura (*) 01/22*1997 0;WF 0 8tong».Tan* 0 0.0 0 0 8 1061 36 MJHWH^tt 01/22/1M7 1:00 0 0 0,0, •^^••t^V^^DI 0 0 0 1061 36 01/22/1997 2:00 0 0 0.0 0 0 0 1061 36 01/22/1997 3:00 0 0 0.0 0 0 0 1061 36 01/22/19974:00 0 0 0.0 0 0 0 1061 38 01/22/1997 8:00 0 0 00 0 0 0 1061 36 01/22/1997 6:00 292 PrOOm '*? 17832 0.3 38 3.8 0,1 1066 36 01/22/1997 7:00 792 88088 1,3 67.8 71.3 2.4 1133 38 01/22/1997 8:00 1090 130498 2.6 131,0 202,3 6.8 1264 42 01/22/1997 9:00 1483 217889 4,3 222.1 424,4 14.2 1486 60 01/22/1997 10:00 2247 392479 8.9 3436 7679 26.7 1629 61 01/22/199711:00 2299 490409 97 276,1 1044,1 35,0 2106 71 01/22/1997 12:00 2223 823810 123 123.8 1187,9 39.1 2229 75 01/22/1997 13:00 2189 788174 14.9 206.6 1373.5 46.0 2436 82 OW22/1997 14:00 2233 889182 17.6 139.0 1912.6 60.7 2674 86 01/22/1997 15:00 2228 1022702 20.1 106.9 1619.8 64.3 2681 90 01/22/1997 16:00 2237. 1188918 22.8 85.5 1705.0 57.1 2766 93 ' ProoMt'^. 01/22/1997 17:00 2209 1289460 28.4 72.4 1777.3 59.5 2830 ' -••••• 95 •• 01/22/1997 18:00 •oaaiwretop* 2184 1419288 27.9 16.9 1796,3 80.2 2858 98 01/22/1997 19:00 2097 1946090 30.4 6.9 1603,1 60,4 2685 96 01/22/1997 20:00 1983 1884090 32.8 13.0 1816.1 60.8 2878 96 01/22/199721:00 1937 1780306 35.1 14.8 1830.9 81,3 2892 97 01/22/1997 22:00 1882 1891427 37.2 12.1 1843.1 61.7 2906 97 01/22/1997 23:00 1762 1996646 39.3 13,4 1656.4 62.2 2918 98 01/23/1997 0:00 1723 2099699 41.4 11.3 1867,7 62.6 2929 98 01/23/1997 1:00 1847 2198711 43.3 3.8 1871,3 62.7 2933 98 01/23/1997 2:00 1880 2293462 45.2 28,9 1897.2 83,6 2969 99 01/23/1997 3:00 1814 2364330 47,0 0.0 1897,2 63,8 2969 99 01/23/19974:00 1489 2471861 48.7 3,2 1900,4 83,7 2982 99 01/23/1997 8:00 1388 2664982 60.3 0.0 1900,4 63.7 2962 99 01/23/1997 8:00 1321 2634206 61,9 10.1 1910.6 64,0 2972 100 01/23/1997 7:00 1244 2706831 83.3 6.4 1918.9 64,2 2977 100 StMMgjM *01/23/199»8!0< 1180 2779914 54,7 7.8 1923.7 84,4 2986 100 •nai 01/23/1997 9:00 1134 2847931 68.1 0,0 1923.7 64,4 2966 100 01/23/1997 10:0 1097 2913789 87,4 0,0 1923.7 64,4 2985 100 01/23/199711:0 1082 2977464 58.6 0.0 1923.7 64,4 2985 100 01/23/1997 12:0 1027 3039096 69.8 0.0 1923.7 64.4 2986 100 hooinntai i , gpm . gaiioni par mlnuti. 2. ppb • parti par billion. 3. TS8 • Total Suipandad SoUdi. 4. Valuat batad on procaaa T88 captura for antlra atorm avarrt (1061 Ib.) plui cumulative TSS capturad In •toraga. L:\woffc\2eS22\pra|«dmfn\2yralonn«v«nl P*gt7o(5 02X11/2000 c e Illinois Central Spring Storm Event Analysis and Process Design Parameters Assumptions Affecting 2-Year Storm Event Spreadsheet 1. The hydrograph data from the January 22,1997 storm event were used as the basis for predicting the storm parameters for the model 2-year, 6-hour storm event. 2. The ratio of storm event flow rates for the January 22,1997 event and the model 2-year storm event (1.806) was used as a direct multiplier to scale up TSS and PCB concentrations from the 1997 storm to the model storm. 3. The safety factor used for the PCB and TSS concentrations is 500 mg/L (an arbitrary maximum concentration) over 414 mg/L (the maximum TSS concentration based upon the model) which is approximately £1%. 4. Percentage of TSS capture assumes that no settling occurs and that storage tank feed pumps are turned off after the tanks are full. The fact that the "Cumulative flow to storage" column continues to accumulate after the storage tanks are full (1.3 million gallons) can be ignored. 5. The computation contained in this spreadsheet does not account for the potential separation of spring flow from runoff in Earth Tech's design. Important Conclusions Derived from 2-Year Storm Event Spreadsheet 1. Average TSS concentration for the 12-hour peak TSS time period is162 mg/L. [(26+170+240+305+305+240+111+188+124+96+76+65X12]. | 2. Total mass of TSS that will flow out of the ICS during the storm event is 2985 Ib. 3. Total flow of water out of the ICS is 4,600,000 gallons during the storm event period of time when TSS concentration is >1 mg/L. 4. Treatment process removes 1061 of 2985 Ibs. TSS, or 35.6% of total. 5. Storage captures at least 1777 of 2985 Ibs. TSS, or 59.5% of total. 6. Total mass of TSS captured and treated is at least 2838 of 2985 Ibs., or 95.1% (35.6% + 59.5%). 7. 95% capture of total TSS is based on pumping 1,289,450 gallons of storm water to storage. L:\work\28522\projadmin\2yrstormevent „ Page 1 of 5 02/02/2000 TaMeS Warns Central Sprinc Flaw tram 25-, If-, and 2-Year Stem E Jan. 97 Storm Even* MB!•• . 20/00 Table 5 Illinois Central Spring Total Water Flow from 25-, 10-, and 2-Year Storm Events , :s,,.. Jan. 97 Storm Event Jan. 97 Incremental Total Serial Date/Time event Total Volume Volume % of Total Date Time Number Flow(gpm) (gallons) (gallons) Volume 1/24/97 3:00 1/24/97 3:00 AM 802 48,270 3,606,573 61.5% 1/24/97 4:00 1/24/97 4:00 AM 800 48,04 2 3,654,615 62.3% 1/24/97 5:00 1/24/97 5:00 AM 779 47,358 3,701,973 63.1% 1/24/97 6:00 1/24/97 6:00 AM 778 46,71 3 3,748,686 63.9% 1/24/9 7 7:00 1/24/97 7:00 AM 761 46,185 3,794,871 64.7% 1/24/9 7 8:00 1/24/97 8:00 AM 749 45,315 3,840,186 65.5% 1/24/9'1 9:00 1/24/97 9:00 AM 733 44,457 3,884,64} 66.2% 1/24/9'7 10:00 1/24/97 10:00 AM 718 43,518 3,928,16I 67.0% 1/24/91!' 11:00 1/24/97 11:00 AM 706 42,729 3,970,881 67.7% 1/24/9')' 12:00 1/24/97 12:00 PM 694 42,0019 4,012,88 68.4% 1/24/97 13:00 1/24/97 1:00 PM 683 41,29 4,054, 17<» 69.1% 1/24/97 14:00 1/24/97 2:00 PM 671 40,60. 4,094,781 69.8% 1/24/97 15:00 1/24/97 3:00 PM 660 39.93C 4,134,711 70.5% 1/24/97 16:00 1/24/97 4:00 PM 643 39.09C 4,173,801 71.2% 1/24/97 17:00 1/24/97 5:00 PM 626 38,070 4,211,871 71.8% 1/24/9 18:00 1/24/97 6:00 PM 610 37,080 4,248,951 72.5% 1/24/9 19:00 1/24/97 7:00 PM 602 36,350 4,285,301 73.1% 1/24/9 20:00 1/24/97 8:00 PM 593 35,850 4,321,151 73.7% 1/24/9 21:00 1/24/97 9:00 PM 585 35,350 4,356,501 74.3% 1/24/9 22:00 1/24/97 10:00 PM 573 34,750 4,391,251 74.9% 1/24/9 23:00 1/24/97 11:OOPM 562 34,050 4,425,301 75.5% 1/25/9 0:00 1/25/97 12:00 AM 550 33,350 4,458,651 76.0% 1/25/97 1:00 1/25/97 1:00 AM 543 32,780 4,491,431 76.6% 1/25/97 2:00 1/25/97 2:00 AM 535 32,340 4,523,771 77.1% 1/25/97 3:00 1/25/97 3:00 AM 528 31,900 4,555,671 77.7% 1/25/97 4:00 1/25/97 4:00 AM 519 31,400 4,587,071 78.2% 1/25/97 5:00 1/25/97 5:00 AM 509 30,840 4,617,911 78.8% 1/25/97 6:00 1/25/97 6:00 AM 500 30,280 4,648,191 79.3% 1/25/97 7:00 1/25/5V 7:00 AM 493 29,800 4,677,991 79.8% 1/25/97 8:00 1/25/97 8:00 AM 487 29,400 4,707,391 80.3% 1/25/97 9:00 1/25/97 9:00 AM 480 29,000 4,736,391 80.8% 1/25/97 10:00 1/25/97 10:00 AM 471 28,520 4,764,911 81.3% 1/25/97 11:00 1/25/97 11:00 AM 461 27,960 4,792,871 81.7% 1/25/97 12:00 1/25/97 12:00 PM 452 27,400 4,820,271 82.2% 1/25/97 13:00 1/25/971. -00PM 446 26,950 4,847,221 82.7% 1/25/97 14:00 1/25/97 2:00 PM 441 26,610 4,873,831 83.1% 1/25/97 15:00 1/25/97 3:00 PM 435 26,270 4,900,101 83.6% 1/25/97 16:00 1/25/97 4:00 PM 427 25,850 4,925,951 84.0% 1/25/97 17:00 1/25/97 5:00 PM 418 25,350 4,951,301 84.4% 1/25/97 18:00 1/25/97 6:00 PM 410 24,850 4,976,151 84.9% 1/25/97 19:00 1/25/97 7:00 PM 403 24,400 5,000,551 85.3% 1/25/97 20:00 1/25/97 8:00 PM 397 24,000 5,024,551 85.7% 1/25/97 21:00 1/25/97 9:00 PM 390 23,600 5,048,151 86.1% 1/25/97 22:00 1/25/97 10:00 PM 382 23,150 5,071,301 86.5% 1/25/97 23:00 1/25/97 11:OOPM 373 22,650 5,093,951 86.9% 1/26/97 0:00 1/26/97 12:00 AM 365 22,150 5,116,101 87.2% 1/26/97 1:00 1/26/97 1:00 AM 360 21,750 5,137,851 87.6% 1/26/97 2:00 1/26797 2:00 AM 355 21,450 5,159,301 88.0% 1/26/97 3:00 1/26/97 3:00 AM 350 21,150 5,180,451 88.3% 1/26/97 4:00 1/26/97 4:00 AM 343 20,800 5,201,251 88.7% 1/26797 5:00 1/26/97 5:00 AM 337 20,400 5,221,651 89.0% L:\Worit\28522\PTOJAdmm\txIendtd_hydrogrmpln 2/2/00 Tabte5 Ka*a Ceatral Spria« Trtal Wa Flaw (ran 25-, Its aad 2-Year Stem Evcatfs Jn.97 iDCiymcnM Total Serial DatoTane event Total Volume Vohane % of Tola! Dale Tune Number Flow (gun) (gallons) (gaHoos) Votane 1/2697 6:00 1/2697 6:00 AM 330 20.000 5^41,65 89.4% 1/2697 7:00 1/2697 7*0 AM 327 19,700 5^6135 89.7% 1/2697 8*0 1/2697 8:00 AM 323 19,500 5,280,85 90.1% 1/2697 9*0 1/2697 9*0 AM 320 19300 5300,15 90.4% 1/2697 10*0 1/2697 10*0 AM 315 19,050 5319^0 90.7% 1/2697 u.-oo 1/2697 11*0 AM 310 18.750 5337^51 91.0% 1/2697 12*0 1/2697 12*0 PM 305 18,450 5356,401 91.3% 1/2697 13:00 1/2697 1:00 PM 301 18,170 5.374,571 91.7% 1/2697 14*0 1/2697 2*0 PM 296 17,910 5392.481 92.0% 1/2697 1540 1/2697 3*0 PM 292 17,650 5,410,131 9X3% 1/2697 16*0 1/2697 4*0 PM 286 17,350 5.427.481 92.6% 1/2697 17*0 1/2697 5:00 PM 281 17.010 5.444,491 92.8% 172697 18*0 1/2697 6*0 PM 275 16,670 5,461,161 93.1% 1/2697 19*0 1/2697 7*0 PM 272 16,400 5.477^61 93.4% 1/2697 20*0 1/2697 8:00 PM 268 16,200 5,493,761 93.7% 1/2697 21*0 1/26/97 9KWPM 265 16,000 5309.761 94.0% 1/2697 22*0 1/2697 KkOOPM 262 15,800 5325361 94.2% 1/2697 23:00 1/2697 IIMPM 258 15,600 5341.161 943% 1/2797 0*0 1/2797 I2.<» AM 255 15.400 5356361 94 J% 1/2797 1*0 1/2797 1:00 AM 251 15.190 5371.751 95.0% 1/2797 2*0 1/27972^0 AM 248 14,970 5386.721 95J% 1/2797 3*0 1/2797 3M AM 244 14.750 5.601.471 95 .5% 1/2797 4*0 1/27/97 4K» AM 239 14^00 5,615.971 95.8% 1/2797 5*0 1/2797 5.-00 AM 235 14^20 5,630,191 96.0% 1/2797 6:00 1/2797 6*0 AM 230 13,940 5.644,131 963% \mm inn 1/2797 7*0 AM 227 13,700 5,657,831 963% warn tM 1/2797 8*0 AM 223 13300 5,671331 96.7% 1/2797 9*0 1/2797 9*0 AM 220 13300 5.684.631 964% 1/2797 10*0 1/279710*0 AM 217 13,100 5,697.731 97.2 % 1/2797 II. -00 1/2797 11*0 AM 213 12,900 5,710,631 97.4% 1/2797 12*0 1/2797 12*0 PM 210 12,700 5.723331 97.6% 1/2797 13*0 1/2797 1*0 PM 207 12320 5.735351 97.8% 1/2797 14*0 1/2797 2*0 PM 205 12360 5,748£ll 98.0% 1/2797 15*0 1/2797 3*0 PM 202 12^00 5,760,411 98-2% 1/2797 16*0 1/2797 4*0 PM 200 12,050 5,772,461 98.4% 1/2797 17*0 1/2797 5*0 PM 197 11.910 5,784371 98.6% 1/27/97 18*0 1/2797 6*0 PM 195 11,770 5,796,141 98.8% 1/2797 19*0 1/2797 7*0 PM 193 11.630 5,807,771 99.0% 1/2797 20*0 1/2797 8*0 PM 190 11,490 5,819.261 99.2% 1/2797 21*0 1/2797 9*0 PM 188 11350 5,830,611 99.4% 1/2797 22*0 1/2797 10*0 PM 186 11.225 5.841,836 99.6% 1/2797 23*0 1/27971 1*0 PM 184 11,115 5.852331 99.8% 1/2897 0*0 1/2897 12*0 AM 183 11,005 5.863,956 100.0% Table 5 Illinois Central Spring Total Water Flow from 25-, 10-, and 2-Year Storm Events 25-Year Storm Design Event 1 25-year Incremental Total Volume to Total Volume Serial Date/Time | design event Volume Volume % of Total process to process Date Time Number I (gpm) (gallons) (gallons) Volume (gpm) (gallons) 1/22/97 0:00 1/22/97 12:00 AM 47 1 47 1 1/22/97 1:00 1/22/97 1:00 AM 540 540 30,322 1/22/97 2:00 1/22/97 2:00 AM 61 1 34,538 34,538 0.2?'. 611 64,860 1/22/97 3:00 1/22/97 3:00 AM 730 40,24 74,78 1 0.4° 73 105,104 1/22/9 7 4:00 1/22/97 4:00 AM 1029 52,77 127,555 0.7" 1,00 157,005 1/22/9 7 5:00 1/22/97 5:00 AM 151 D 76,16i 203,720 1.2* 1,001 217,005 1/22/9'7 6:00 1/22/97 6:00 AM 211 5 108,78 312,507 1.8°/ 1,00( 277,005 1/22/9'? 7:00 1/22/97 7:00 AM 293<5 151,55 464,06 S 2.70/ 1,001 337,005 1/22/9'' 8:00 1/22/97 8:00 AM 342'1 190,78 654,841i 3.8°/1 1,00< 397,005 1/22/9'r 9:00 1/22/97 9:00 AM 4011J 223,24 878,09 1 5.1* 1,001 457,005 1/22/97 10:00 1/22/97 10:00 AM 5311J 280,06 1,158,15?5 6.7? I, OCX 517,005 1/22/97 11:00 1/22/97 11:00 AM 540: 321,62 1,479,78^f 8.50/ 1,(XX 577,005 1/22/97 12:00 1/22/97 12:00 PM 5275> 320,47« 1,800,26C1 10.4»/ l.OOC 637,005 1/22/97 13:00 1/22/97 1:00 PM 5224 315,098 2, 11 5,357 12.20/ i.ooe 697,005 1/22/97 14:00 1/22/97 2:00 PM 5296 315,595 2,430,952 14.00/ l.OOC 757,005 1/22/97 15:00 1/22/97 3 :OOPM 5283 317,361 2,748,313 15.80/ 1,000 817,005 1/22/97 16:00 1/22/97 4:00 PM 5302 317,529 3,065,843 17.70/ 1,000 877,005 1/22/97 17:00 1/22/97 5:00 PM 5256 316,722 3,382,565 19.5% 1,000 937,005 1/22/97 18:00 1/22/97 6:00 PM 5182 313,137 3,695,702 21.3% 1,000 997,005 1/22/97 19:00 1/22/97 7:00 PM 5072 307,626 4,003,328 23.1% 1,000 1,057,005 1/22/97 20:00 1/22/97 8:00 PM 4886 298,752 4,302,08Q 24.8% 1,000 1,117,005 1/22/97 21:00 1/22/97 9:00 PM 4810 290,899 4,592,978 26.5% 1,000 1,177,005 1/22/97 22:00 1/22/971 0:00 PM 4671 284,447 4,877,425 28.1% 1,000 1,237,005 1/22/97 23:00 1/22/97 11:OOPM 4507 275,360 5,152,786 29.7% 1,000 1,297,005 1/23/97 0:00 1/23/97 12:00 AM 4459 268,998 5,421,783 31.3% 1,000 1,357,005 1/23/97 1:00 1/23/97 1:00 AM 4335 263,833 5,685,616 32.8% 1,000 1,417,005 1/23/97 2:00 1/23/97 2:00 AM 4225 256,805 5,942,421 34.3% 1,000 1,477,005 1/23/97 3:00 1/23/97 3:00 AM 4118 250,282 6,192,703 35.7% 1,000 1,537,005 1/23/97 4:00 1/23/99 4:00 AM 4027 244,346 6,437,049 37.1% 1,000 1,597,005 1/23/97 5:00 1/23/97 5:00 AM 3907 238,010 6,675,058 38.5% 1,000 1,657,005 1/23/97 6:00 1/23/97 6:00 AM 3801 231,230 6,906,288 39.8% 1,000 1,717,005 1/23/97 7:00 1/23/97 7:00 AM 3675 224,281 7,130,570 41.1% 1,000 1,777,005 1/23/97 8:00 1/23/97 8:00 AM 3578 217,599 7,348,169 42.4% 1,000 1,837,005 1/23/97 9:00 1/23/97 9:00 AM 3495 212,186 7,560,355 43.6% 1,000 1,897,005 1/23/97 10:00 1/23/97 10:00 AM 3435 207,891 7,768,246 44.8% 1,000 1,957,005 1/23/97 11:00 1/23/97 11:00 AM 3377 204,368 7,972,615 46.0% 1,000 2,017,005 1/23/97 12:00 1/23/97 12:00 PM 3320 200,907 8,173,522 47.1% 1,000 2,077,005 1/23/97 13:00 I/23/971:OOPM 3261 197,420 8,370,942 48.3% 1,000 2,137,005 1/23/97 14:00 1/23/97 2:00 PM 3166 192,814 8,563,756 49.4% 1,000 2,197,005 1/23/97 15:00 1/23/97 3:00 PM 3090 187,685 8,751,441 50.5% 1,000 2,257,005 1/23/97 16:00 1/23/97 4:00 PM 3002 182,769 8,934,210 51.5% 1,000 2,317,005 1/23/97 17:00 1/23/97 5:00 PM 2901 177,098 9,111,309 52.5% 1,000 2,377,005 1/23/97 18:00 1/23/97 6:00 PM 2818 171,561 9,282,870 53.5% 1,000 2,437,005 1/23/97 19:00 1/23/97 7:00 PM 2767 167,541 9,450,411 54.5% 1,000 2,497,005 1/23/97 20:00 1/23/97 8:00 PM 2711 164,338 9,614,748 55.4% 1,000 2,557,005 1/23/97 21:00 1/23/97 9:00 PM 2605 159,475 9,774,223 56.3% 1,000 2,617,005 1/23/97 22:00 1/23/971 0:00 PM 2578 155,490 9,929,713 57.2% 1,000 2,677,005 1/23/97 23:00 1/23/97 11:OOPM 2524 153,077 10,082,790 58.1% 1,000 2,737,005 1/24/97 0:00 1/24/97 12:00 AM 2479 150,095 10,232,884 59.0% 1,000 2,797,005 1/24/97 1:00 1/24/97 1:00 AM 2443 147,646 10,380,530 59.8% 1,000 2,857,005 1/24/97 2:00 1/24/97 2:00 AM 2388 144,930 10,525,460 60.7% 1,000 2,917,005 L:\WorkUSS22\PrDJAdmifi\enended_hydrognplii 2/2/00 TaWeS iCeatralSpriaf Tatal Water Flaw fro* 25-t It-, a«4 2-Year Star* B 25-Yts 25-year Incremental Total Volume to Total Volume Serial Date/Time design event Volume Volume % of Total process to process Due Tue Number (gallons) (gallons) Volume (gpm) (gallons) 1/2497 300 1/2497 3OO AM 237 142,78!3 10,668^4 613"ft l.OOOl 2577,005 1/2497 400 1/2497 4OO AM 2366 142.1011 10,81035 6231ft 1.000 3,037,005 1/2497 500 1/2497 500 AM 2304 140,08.S 10,950,434 63.11ft 1,000 3,097,005 1/2497 600 1/2497 6OO AM 2302 138,171 11,088,61 63.9% 1,00D 3,157,005 1/2497 700 1/2497 700 AM 2252 136,61!5 11.225,221 64.7%| 1,000 3,217,005 1/2497 800 1/24/97 8OO AM 2216 134,042I II359,27( 65.5%l 1,001» 3,277,005 1/2497 900 1/24/97 9OO AM 2167 131304 11.490,77 66J% 1,001• 3337,005 1/2497 IOOO 1/2497 IOOO AM 2124 128,72* 1I.6I930C 67.0%) 1,001) 3397.005 1/2497 IIOO 1/2497 IIOO AM 2088 126364 11,745,866 67.7% 1,001) 3,457,005 1/2497 1200 1/2497 1200PM 2053 124,236 11470,102 68.4*i I.OOt> 3317,005 1/2497 I3OO 1/2497 IOO PM 2019 122,151 11592^53 69.1*i 1,OOC\ 3377,005 1/2497 1400 1/2497 2OOPM 1985 120,110 12,112362 69.8*. I.OOC 3,637.005 1/2497 1500 1/24/97 3OOPM 1952 118,113 12^30,475 703*1, 1,000 3,697,005 1/2497 1600 1/2497 4OOPM 1902 115,628 12346,103 7I.2*• 1,000 3,757,005 ,, 1/2497 I7OO 1/2497 500PM 1852 112,611 12,458,714 71.8%) 1,000 3,817,005 1/2497 I8OO 1/2497 600PM L_ 1804 109,683 12368397 723% 1.000 3,877,005 1/2497 1900 1/2497 7OO PM 1780 107323 12,675520 73.1% 1,000 3537,005 1/2497 2000 1/2497 800PM ; 1755 106,044 12.781565 73.7% 1,000 3,997,005 1/2497 21 OO 1/2497 900PM 1730 104365 12.886330 743% 1,000 4,057,005 1/2497 22OO 1/2497 IOOO PM : 1696 102,790 12589320 745% 1,000 4,117,005 1/2497 23OO 1/2497 1100PM i 1661 100,720 13.090.040 753% 1,000 4,177,005 1/2597 OOO 1/2597 I2OO AM 1627 98,649 13.188.690 76.0% 1,000 4.237,005 1/2597 IOO 1/2597 IOO AM 1605 96.963 13,285,653 76.6% 1,000 4,297,005 1/2597 2OO I/25972OOAM 1584 95.662 13381315 77.1% 1,000 4357,005 1/2597 3OO 1/25/97 3:00 AM 1562 94360 13.475,675 77.7% 1,000 4,417,005 1/2597 4OO 1/2597 4OO AM 1534 92,881 13368356 78.2% 1,000 4,477,005 1/2597 500 1/2597 5OO AM 1507 91,225 13,659.781 78.8% 1,000 4337,005 1/2597 6OO 1/2597 6OO AM 1479 89368 13.749349 793% 1,000 4397,005 1/2597 7OO 1/25/97 7OO AM 1459 88,148 13,837,497 79.8% 1,000 4,657,005 1/2597 800 1/2597 8OO AM 1440 86565 13,924,463 803% 1.000 4,717,005 1/2597 9OO 1/2597 9OO AM 1420 85,782 14,010.245 80.8% 1,000 4,777,005 1/2597 IOOO 1/2597 IOOO AM 1392 84362 14,094,607 813% 1,000 4,837,005 t, 1/2597 IIOO 1/2597 IIOO AM 1365 82,706 14,177312 81.7% 1,000 4,897,005 1/2597 I2OO 1/2597 I2OOPM 1337 81,049 14.258362 82-2%) 1,000 4557,005 1/2597 1300 1/2597 IOO PM 1320 79.718 14338,080 82.7% 1,000 5,017,005 1/2597 144)0 1/2597 2OOPM 1303 i 78,712 14,416.792 83.1% 1,000 5,077.005 1/2597 154)0 1/2597 300PM 1287 77,707 14.494.499' 83.6% 1,000 5.137.005 1/2597 I6OO 1/25/97 4:00 PM 1262 76,464 14370563 84.0% 1,000 5.197,005 1/2597 I7OO 1/2597 500PM 1237 74.985' 14,645,948 84.4% 1.000 5,257,005 1/2597 I8OO 1/2597 6OOPM 1213 73306 14,719,455 845% 1,000 5317,005 1/2597 I9OO 1/2597 7OOPM 1193 72,175' 14.791,630 853% 1.000 5377,005 1/2597 2000 1/2597 800PM 1173 70592! 14,862,622 85.7% 1,000 5,437,005 1/2597 2IOO 1/2597 900PM 1154 69,809 14532.431 86.1% 1,000 5.497,005 1/2597 22OO 1/2597 IOOO PM 1129 68,478; 15,000508 863% 1,000 5357,005 1/2597 2300 1/25971100 PM 1104 66599 15,067,907 865% 1,000 5,617,005 1/2697 000 1/2697 12OO AM 1080 65320 15,133,427 87.2% 1,000 5,677,005 1/2697 100 1/2697 IOO AM 1065 64336 15,197,763 87.6% 1,000 5,737,005 1/2697 200 1/2697 200 AM 1050 63.449 15,261.212 88.0% 1,000 5,797,005 1/2697 300 1/2697 300 AM 1035 62362 15323,774 883% 1,000 5,857,005 1/2697 400 1/26/97 4:00 AM 1016 61326 15385300 88.7% 1,000 5,917,005 1/2697 500 1/26/97 5OO AM 996 60343 15,445,644 89.0% 996 5,976,880 Table 5 Illinois Central Spring Total Water Flow from 25-, 10-, and 2-Year Storm Events 25-Year Storm Design Event I 25-year Incremental Total Volume to Total Volume | design event Volume Volume % of Total process to process I II (gpm) (gallons) (gallons) Volume (gpm) (gallons) 1/26/97 6:00 1/26/97 6:00 AM 976 59,160 15,504,804 89.494 976 6,036,040 1/26/9 7 7:00 1/26/97 7:00 AM 966 58,273 15,563,076 89.79', 966 6,094,313 1/26/9 7 8:00 1/26/97 8:00 AM 956 57,681 15,620,757 90.10/i 95S 6,151,994 1/26/9 9:00 1/26/97 9:00 AM 94 57,08 9 15,677,84 90.40/ 947 6,209,083 1/26/9 10:00 1/26/97 10:00 AM 93 56,359 15,734,19 90.7* 93Z 6,265,433 1/26/9- 11:00 1/26/97 11:00 AM 91 55,46.5 15,789,65' 91.00/ 91'1 6,320,896 1/26/9' 12:00 1/26/971 2:00 PM 90: 54,57;5 15,844,23' 91. 3°/ 90: 6,375,471 1/26/9' 13:00 1/26/97 1:00 PM 88< 53,74'1 15,897,98 91. 7°/ 88< 6,429,218 1/26/97 14:00 1/26/97 2:00 PM 87' 52.97J1 15,950,955 92.W 87' 6,482,196 1/26/97 15:00 1/26/97 3:00 PM 864 52,20$> 16,003,161 92.3% 864 6,534,404 1/26/97 16:00 1/26/97 4:00 PM Ml 51,321 16,054,485 92.6V 847 6,585,726 1/26/97 17:00 1/26/97 5:00 PM 830 50,316 16,104,804 92.8% 83G 6,636,041 1/26/97 18:00 1/26/97 6:00 PM 813 49,310 16,154,114 93.1% 813 6,685,351 1/26/97 19:00 1/26/97 7:00 PM 804 48,511 16,202,625 93.4% 804 6,733,862 1/26/97 20:00 1/26/97 8:00 PM 794 47,92 16,250,545 93.7% 794 6,781,782 1/26/97 21:00 1/26/97 9:00 PM 784 47,32 16,297,873 94.0% 784 6,829,110 1/26/97 22:00 1/26/97 10:00 PM 774 46,736 16,344,609 94.2% 774 6,875,846 1/26/97 23:00 1/26/97 11:OOPM 764 46,145 16,390,754 94.5% 764 6,921,991 1/27/97 0:00 1/27/97 12:00 AM 754 45,553 16,436,307 94.8% 754 6,967,544 1/27/97 1:00 1/27/97 1:00 AM 743 44,932 16,481,239 95.0% 743 7,012,476 1/27/97 2:00 1/27/97 2:00 AM 733 44,281 16,525,521 95.3% 733 7,056,758 1/27/97 3:00 1/27/97 3:00 AM 722 43,630 16,569,151 95.5% 722 7,100,388 1/27/97 4:00 1/27/97 4:00 AM 708 42,891 16,612,042 95.8% 708 7,143,279 1/27/97 5:00 1/27/97 5:00 AM 694 42,063 16,654,105 96.0% 694 7,185,342 1/27/97 6:00 1/27/97 6:00 AM 680 41,235 16,695,339 96.3% 680 7,226,576 1/27/97 7:00 1/27/97 7:00 AM 670 40,525 16,735,864 96.5% 670 7,267,101 1/27/97 8:00 1/27/97 8:00 AM 661 39,933 16,775,797 96.7% 661 7,307,034 1/27/97 9:00 1/27/97 9:00 AM 651 39,341 16,815,138 96.9% 651 7,346,375 1/27/97 10:00 1/27/97*1 0:00 AM 641 38,750 16,853,888 97.2% 641 7,385,125 1/27/97 11:00 1/27/97 11:00 AM 631 38,158 16,892,046 97.4% 631 7,423,283 1/27/97 12:00 1/27/97 12:00 PM 621 37,567 16,929,613 97.6% 621 7,460,850 1/27/97 13:00 1/27/97 1:00 PM 613 37,034 16,966,647 97.8% 613 7,497,884 1/27/97 14:00 1/27/97 2:00 PM 605 36,561 17,003,208 98.0% 605 7,534,445 1/27/97 15:00 1/27/97 3:00 PM 598 36,088 17,039,296 98.2% 598 7,570,533 1/27/97 16:00 1/27/97 4:00 PM 591 35,644 17,074,940 98.4% 591 7,606,176 1/27/97 17:00 1/27/97 5:00 PM 584 35,230 17,110,169 98.6% 584 7,641,406 1/27/97 18:00 1/27/97 6:00 PM 577 34,816 17,144,985 98.8% 577 7,676,222 1/27/97 19:00 1/27/97 7:00 PM 570 34,402 17,179,387 99.0% 570 7,710,623 1/27/97 20:00 1/27/97 8:00 PM 563 33,987 17,213,374 99.2% 563 7,744,611 1/27/97 21:00 1/27/97 9:00 PM 556 33,573 17,246,947 99.4% 556 7,778,184 1/27/97 22:00 1/27/97 10:00 PM 551 33,204 17,280,151 99.6% 551 7,811,388 1/27/97 23:00 1/27/97 11:OOPM 545 32,878 17,313,029 99.8% 545 7,844,266 1/28/97 0:00 1/28/97 12:00 AM 540 32,553 17,345,582 100.0% 540 7,876,819 total to water from storm = 1 7,345,582 total to water to process = 7,876,8 1 9 total to storage tanks - 1 ,300,000 total water bypassed = 8,1 68,763 2/2/00 Table 5 T«(al Water Flaw frw 2S> 1*\ a«4 2- Year Stor» » 10-Year Stem DesigaE 10-year Incirinrnial votnaneto Total Volume Serial Dae/Time design event Volume Total Volume % of Total process to process D« TMBC Number (On) (gallons) (gallons) Vobnac (gpn) (gallons) 1/22/97 04)0 1/2297 124)0 AM 373 373 1/2297 14)0 1/2297 1:00 AM 427 427 24,008 1/2297 24)0 1/2297 24)0 AM 484 2734 27345 OJ21Ifc 484 51353 1/2297 34)0 1/2297 34» AM 578 31,86. 59.20B 0.4!16 578 83,216 1/2297 44)0 1/2297 44)0 AM 815 41,7* 100,99Z 0.7116 815 125.000 1/2297 54» 1/2297 54)0 AM 1195 6030< 161^9)S 1.21t 1,000 179,443 1/2297 64)0 1/2297 64)0 AM 1676 86,132 247,42)I 1.8% 1.000 239,443 172297 7:00 1/2297 74)0 AM 2324 119,991 367,421( Z7% 1,000 299,443 1/2297 84)0 1/2297 84)0 AM 2711 151.053 518,47"r 3J% 1,000 359,443 172297 94)0 1/2297 94)0 AM 3181 176.753 695^31 5.1%) 1,000 419.443 172297 104)0 1/2297 104)0 AM 4210 221,741 916^71 6.7%| 1.000 479,443 172297 114)0 1/2297 114)0 AM 4278 254.650 1.171.621 83% 1.000 539.443 mm 124)0 1/2297 124)0 PM 4180 253.737 1,425351 ia4*i 1.000 599.443 /2297 134)0 1/2297 1:00 PM 4136 249,479 1.674,837 IZ2«• 1,000 659.443 172297 144)0 1/2297 2:00 PM ! 4193 249,873 1,924.709 14.0* • 1,000 719,443 /2297 154)0 1/229734WPM 1 1 4183 251,271 2,175.980 15.W> 1,000 779,443 /2297 164)0 I/229744WPM '• ! 4198! 251,404 2,427385 17.TS 1,000 839,443 1/2297 174)0 1/2297 5:00 PM | 4161 250,765 2.678,150 I93N 1,000 899,443 72297 184)0 172297 64)0 PM | 4103 247,926 2.926.076 21J% 1.000 959.443 /2297 194)0 ! I/229774WPM ; < 4016; 243.563 3.169.639 23.1% 1,000 1,019.443 1/2297 204)0 1 1/229784N)PM j 3869 236^37 3.406,177 24.8% 1,000 1.079.443 1/2297 214)0 1/2297 94)0 PM 3809 230319 3.636,496 265% 1,000 1.139.443 1/2297 224)0 1/2297 HMMPM 3698 225.211 3.861.707 28.1% 1,000 1.199,443 172297 23.-00 1/2297 II4WPM 3569 218,017 4.079,724 29.7% 1,000 1,259,443 1/2197 04)0 1/23/97 12:00 AM 3531 212^79 4,292,703 313% 1,000 1319,443 1/2397 14)0 1/23/97 1:00 AM 3432 208.890 430U93 32.8% 1,000 1379,443 1/23/97 2.-00 1/2397 24)0 AM 3345 203325 4,704,919 34 J% 1,000 1,439,443 1/2397 34)0 1/23/97 3:00 AM 3260 198.161 4.903,080 35.7% 1,000 1,499,443 1/23797 4:00 1/23/07 4:00 AM 3188 193,461 5,096341 37.1% 1,000 1359,443 1/2397 54)0 I/239754N)AM 3093 188.444 5,284,985 383% 1,000 1.619,443 1/23797 6410 1/23/97 6:00 AM 3009 183.076 5.468,062 39.8% 1,000 1,679,443 1/23797 74)0 1/23/97 7:00 AM 2910 177375 5.645,637 41.1% 1,000 1,739.443 1/23/97 84)0 I/239784IOAM 2833 172^85 5,817,921 42.4% 1,000 1,799,443 1/23/97 94)0 I/239794MAM 2767 167.999 5,985,920 43.6% 1.000 1,859,443 1/2397 104)0 1/23/97 lOrtO AM 2720 164398 6,150318 44.8% 1.000 1.919,443 1/23797 114)0 1/2397 114WAM 2674 161,809 6312327 46.0% 1,000 1^79,443 103197 124)0 1/2397 124)0 PM 2628 159,069 6,471396 47.1% 1,000 2,039,443 1/23/97 134)0 1/23/97 1:00 PM 2582 156307 6,627,703 483% 1.000 2,099,443 1723797 144)0 1/23/97 24)0 PM 2507 152,661 6,780364 49.4% 1,000 2,159,443 1/23797 154)0 1/23/97 3:00 PM 2446 148,600 6^28,964 503% 1,000 2^19,443 1723797 164)0 1/23/97 4:00 PM 2377 144,707 7,073.671 513% 1.000 2^79,443 1/23797 174)0 1/23797 54)0 PM 2297 140^18 7^13.889 525% 1,000 2339,443 1/23797 184)0 1/23797 64» PM 2231 135,834 7349,723! 533% 1,000 2399,443 1/23797 194)0 1/23/97 74» PM 2191 132.651 7,4823741 543% 1,000 2,459,443 1/23797 204)0 1/23/97 84)0 PM 2146 130.114 7,612,488 55.4% 1.000 2,519,443 1/23797 214)0 1/23797 94» PM 2062 126^64 7.738.753 563% 1,000 2379,443 1/23797 224)0 1/2397 104)0 PM 2041 123,110 7,861.862 57 3% 1,000 2,639.443 1/23797 234)0 1/23797 1 1 M PM 1999 121,199 7,983,061 58.1% 1,000 2,699.443 1/24797 04)0 1/24/97 124)0 AM 1963 118,838 8,101.898 59.0% 1,000 2,759,443 1/24797 14)0 1/24/97 1:00 AM 1934 116,899 8^18,797 59.8% 1,000 2,819,443 1/24797 24)0 1/24/97 24)0 AM 1891 114,749 8333346 60.7% 1,000 2,879,443 Table 5 Illinois Central Spring Total Water Flow from 25-, 10-, and 2-Year Storm Events 10-Year Storm Design Event 10-year Incremental . volume to Total Volume Serial Date/Time design event Volume Total Volume % of Total process to process Date Time Number (gpm) (gallons) (gallons) Volume (gpm) (gallons) 1/24/97 3:00 1/24/97 3:00 AM 1877 113,048 8,446,594 61.51/. 1,000 2,939,443 1/24/97 4:00 1/24/97 4:00 AM 1873 112,514 8,559,108 62.3?/o 1,000 2,999,443 1/24/97 5:00 1/24/97 5:00 AM 1824 110,912 8,670,021 63. 1?4 1,000 3,059,443 1/24/9 6:00 1/24/97 6:00 AM 1823 109,402 8,779,423 63.9? 1,000 3,119,443 1/24/9 7:00 1/24/97 7:00 AM 1783 108,165 8,887,588 64.70/ 1,000 3,179,443 1/24/9' 8:00 1/24/97 8:00 AM 1755 106,128 8,993,716 65.5«/ 1,(X>0 3,239,443 1/24/9" 9:00 1/24/97 9:00 AM 1716 104,118 9,097,834 66.25 1,001 9 3,299,443 1/24/9' 10:00 1/24/97 10:00 AM 1682 101,91 ? 9,199,753 67.0* 1,001 D 3,359,443 1/24/9' 11:00 1/24/97 11:00 AM 165.} 100,05() 9,299,80.5 67.79- 1,00( ) 3,419,443 1/24/9T 12:00 1/24/97 12:00 PM 162i 5 98,36*1 9,398,16'1 68.4* l.CKK) 3,479,443 1/24/97 13:00 1/24/97 1:00 PM 1591 J 96.7K1 9,494,88() 69.1* 1,(KK) 3,539,443 1/24/97 14:00 1/24/97 2:00 PM 157 95,09:t 9,589,971 69.8% 1,00( 3,599,443 1/24/97 15:00 1/24/97 3:00 PM 154< 93,5 It. 9,683,492 70.5* l.OOC 3,659,443 1/24/97 16:00 1/24/97 4:00 PM 150< 91,549 9,775,042 71.2* i.ooe 3,719,443 1/24/97 17:00 1/24/97 5:00 PM 1466 89,160 9,864,202 71.8% 1,000 3,779,443 1/24/97 18:00 1/24/97 6:00 PM 1429 86,841 9,951,043 72.5% 1,000 3,839,443 1/24/97 19:00 1/24/97 7:00 PM 1409 85,132 10,036,175 73.1% 1,000 3,899,443 1/24/97 20:00 1/24/97 8:00 PM 1390 83,961 10,120,136 73.7% 1,000 3,959,443 1/24/97 21:00 1/24/97 9:00 PM 1370 82,790 10,202,925 74.3% 1,000 4,019,443 1/24/97 22:00 1/24/971 0:00 PM 1343 81,384 10,284,310 74.9% 1,000 4,079,443 1/24/97 23:00 I/24/9711:OOPM 1315 79,745 10,364,055 75.5% 1,000 4,139,443 1/25/97 0:00 1/25/97 12:00 AM 1288 78,106 10,442,161 76.0% 1,000 4,199,443 1/25/97 1:00 1/25/97 1:00 AM 1271 76,771 10,518,931 76.6% 1,000 4,259,443 1/25/97 2:00 1/25/97 2:00 AM 1254 75,740 10,594,672 77.1% 1,000 4,319,443 1/25/97 3:00 1/25/97 3:00 AM 1237 74,710 10,669,381 77.7% 1,000 4,379,443 1/25/97 4:00 1/25/97 4:00 AM 1215 73,539 10,742,920 78.2% 1,000 4,439,443 1/25/97 5:00 1/25/97 5:00 AM 1193 72,227 10,815,143 78.8% 1,000 4,499,443 1/25/97 6:00 1/25/97 6:00 AM 1171 70,916 10,886,063 79.3% 1,000 4,559,443 1/25/97 7:00 1/25/97 7:00 AM 1155 69,792 10,955,855 79.8% 1,000 4,619,443 1/25/97 8:00 1/25/97 8:00 AM 1140 68,855 11,024,710 80.3% 1,000 4,679,443 1/25/97 9:00 1/25/97 9:00 AM 1124 67,918 11,092,628 80.8% 1,000 4,739,443 1/25/97 10:00 1/25/97 10:00 AM 1102 66,794 11,159,422 81.3% 1,000 4,799,443 1/25/97 11:00 1/25/97 11:00 AM 1080 65,482 11,224,904 81.7% 1,000 4,859,443 1/25/97 12:00 1/25/97 12:00 PM 1059 64,171 11,289,075 82.2% 1,000 4,919,443 1/25/97 13:00 1/25/97 1:00 PM 1045 63,117 11,352,192 82.7% 1,000 4,979,443 1/25/97 14:00 1/25/97 2:00 PM 1032 62,321 11,414,512 83.1% 1,000 5,039,443 1/25/97 15:00 1/25/97 3 :OOPM 1019 61,524 11,476,037 83.6% 1,000 5,099,443 1/25/97 16:00 1/25/97 4:00 PM 999 60,541 11,536,577 84.0% 999 5,159,421 1/25/97 17:00 1/25/97 5:00 PM 980 59,370 11,595,947 84.4% 980 5,218,790 1/25/97 18:00 1/25/97 6:00 PM 960 58,199 11,654,146 84.9% 960 5,276,989 1/25/97 19:00 1/25/97 7:00 PM 945 57,145 11,711,290 85.3% 945 5,334,134 1/25/97 20:00 1/25/97 8:00 PM 929 56,208 11,767,498 85.7% 929 5,390,342 1/25/97 21:00 1/25/97 9:00 PM 913 55,271 11,822,770 86.1% 913 5,445,613 1/25/97 22:00 1/25/971 0:00 PM 894 54,217 11,876,987 86.5% 894 5,499,830 1/25/97 23:00 1/25/97 1 1:00 PM 874 53,046 11,930,033 86.9% 874 5,552,877 1/26/97 0:00 1/26/97 12:00 AM 855 51,875 11,981,909 87.2% 855 5,604,752 1/26/97 1:00 1/26/97 1:00 AM 843 50,938 12,032,847 87.6% 843 5,655,690 1/26/97 2:00 1/26/97 2:00 AM 831 50,236 12,083,083 88.0% 831 5,705,926 1/26/97 3:00 1/26/97 3:00 AM 820 49,533 12,132,616 88.3% 820 5,755,460 1/26/97 4:00 1/26/97 4:00 AM 804 48,714 12,181,330 88.7% 804 5,804,173 1/26/97 5:00 1/26/97 5:00 AM 788 47,777 12,229,107 89.0% 788 5,851,950 L:\Worlt\2B522\ProjAdmin\ixtendedJiydrogrlphl 2/2/00 TableS IffiM* Central Spring TctalWa Ftow tnm 25-, !•-, mmt 2-Year Stana B l»-Ycar Stum Daaga EwMt 10-year lOCTCIHf rtBl volume to Total Volume Serial DateHne dcsigp cvut Volume Total Volume % of Total process to process DwK Tane Number (gallons) (gallons) (gallons) 1/2697 630 1/2697 630 AM 773 46,840 12475.947 89.4% 773 5,898,790 1/2697 730 1/2697 730 AM 765 46.137 12422.084 89.7% 765 5.944,927 1/2697 830 1/2697 830 AM 757 45.669 12367,753 90.1% 757 5,990496 1/2697 930 1/2697 930 AM 749 45401 12,4124*54 90.4% 749 6.035,797 1/2697 1030 1/2697 1030 AM 738 44.615 12,457469 90.7% 738 6,080.412 1/2697 1130 1/2697 1130 AM 726 43,913 12401.481 91.0% 726 6.124425 1/2697 1230 1/2697 1230PM 714 43410 12444.691 914% 714 6.167435 1/2697 1330 1/2697 130PM 704 42454 12487445 91.7% 704 6410,089 1/2697 1430 1/2697 230PM 694 414M5 12.629.191 92.0% 694 6452,034 1/2697 1530 1/2697 330PM 684 41436 12,670427 923% 684 6493470 1/2697 1630 1/2697 430PM 671 40.634 12,711,161 92.6% 671 6434,004 1/2697 1730 1/2697 530PM 657 39,837 12.750498 92.8% 657 6473,841 1/2697 1830 1/2697 630PM 644 39.041 12.790,039 93.1% 644 6,412,882 1/2697 1930 1/2697 730PM 636 38.409 12,828,448 93.4% 636 6,451491 1/2697 2030 1/2697 830PM 628 37,940 12.866488 93.7% 628 6,489432 1/2697 2130 1/2697 930PM 621 37,472 124*03.860 94.0% 621 6426,704 1/2697 2230 1/2697 1030PM 613 37,004 124*40.864 944% 613 6463.707 1/2697 2330 1/26971130 PM 605 36435 124*77499 944% 605 6,600442 1/27/97 030 1/2797 1230 AM 597 36.067 13,013,466 94.8% 597 6,636409 1/2797 130 1/27/97 130 AM 589 35475 13,049,041 95.0% 589 6.671.884 1/2797 230 1/2797 230 AM 580 35.060 13,084,101 954% 580 6.7064*44 1/2797 330 1/27/97 330 AM 571 34444 13,118.645 954% 571 6.741.488 1/2797 430 1/2797 430 AM 561 334*59 13.152.604 95.8% 561 6.775,447 1/2797 530 , 1/2797 530 AM 550 33403 13,1854*07 96.0% 550 6.808,751 1/2797 630 1/27/97 630 AM 539 32,647 13418455 964% 539 6.841498 1/2797 730 1/2797 730 AM 531 32,085 13450.640 964% 5311 6.873.484 1/2797 830 1/2797 830 AM 523 31.617 13482457 96.7% 523 64*05.101 1/2797 930 1/2797 930 AM 515 31.149 13413,406 96.9% 515 6.936449 1/2797 1030 1/279* 1030 AM 507 30.680 13444.086 97 .2% 507 6,966.929 1/2797 1130 1/2797 1130 AM 500 30412 13474498 97.4% 500 6,997,141 1/2797 1230 1/2797 1230PM 492 29.743 13.404.041 97.6% 492 7,026,885 1/2797 1330 1/2797 130PM 486 29422 13.433463 97.8% 486 7.056406; 1/2797 1430 1/2797 230PM 479 284*47 13.462410 98.0% 479 7.085.1541 1/2797 1530 1/2797 330PM 473 28472 13.490.883 984% 473 7,113.726 1/27/97 16ruO 1/2797 430PM 468 28421 13419,104 98.4% 468 7.141.947 1/27/97 1730 1/2797 530PM 462 27.893 134464»97 98.6% 462 7.169.840 1/27/97 1830 1/2797 630PM 457 27465 13474462 98.8% 457 7,197.406 1/2797 1930 1/2797 730 PM 451 27437 13.601,800 99.0% 451 7424.643 1/2797 2030 1/2797 830PM 446 26.910 13,628,709 99.2% 446 7451453 1/2797 2130 1/2797 930PM 440 26482 13,655491 99.4% 440 7478,134 1/2797 2230 1/2797 1030PM 436 26489 13,681480 99.6% 436 7404,423 1/2797 2330 1/2797 1130PM 432 26.031 13,707,611 99.8% 432 7430.455 1/2897 030 1/2897 1230 AM 427 25.774 13,733485 100.0% 427 7456428 total to waterfro mstor m - 13,733485 total to water to process = 7456428 total to storage tanks. = 1400.000 total water bypassed — 5.077,157 2/zno Table 5 Illinois Central Spring Total Water Flow from 25-, 10-, and 2-Year Storm Events 2- Year Storm Design Event 2-year Incremental Volume to Total Volume Serial Date/Time design Volume Total Volume % of Total process to process Date Time Number event (gpm) (gallons) (gallons) Volume (gpm) (gallons) 1/22/97 0:00 1/22/97 12:00 AM 288 288 1 1/22/97 1:015 1/22/97 1:00 AM 330 330 18,513 1/22/97 2:013 1/22/97 2:00 AM 373 21,087 21,087 0.2?'o 373 39,600 1/22/ 3:01) 1/22/97 3:00 AM 446 24,571 45,657 0.40/<, 446 64,171 1/22/9 4:00 1 1/22/97 4:00 AM 628 32,221 77,878 0.794 628 96,392 1/22/9 5:00 1/22/97 5:00 AM 922 46,503 124,381 1.2e/i 92,2 142,894 1/22/9 6:00 1/22/97 6:00 AM 1292 66,419 190,8010 1.8*i 1,001D 200,548 1/22/9 7:00 1/22/97 7:00 AM 1792 92,534 283,33 I 2.7*& 1,001J 260,548 1/22/9 8:00 1/22/97 8:00 AM 2090 116,482 399,8 11S 3.891i 1,(XX) 320,548 1/22/9 9:00 1/22/97 9:00 AM 2453 136,301 536, 11'1 5.1*. i.om) 380,548 1/22/9 10:00 1/22/97 10:00 AM 3247 170,992 707,10*> 6.7°X. 1,00() 440,548 1/22/9 11:00 1/22/97 11:00 AM 3299 196,370 903,47$> 8.5°/i> l.OOC) 500,548 1/22/9 12:00 1/22/971 2:00 PM 3223 195,666 1,099,144( 10.434> l.OOC> 560,548 1/22/9 13:00 1/22/97 1:00 PM 3189 192,382 1,291,52'' 12.29*, 1,OOC1 620,548 1/22/9 14:00 1/22/97 2:00 PM 3233 192,686 1,484,212 14.094 1,OOC 680,548 1/22/9 15:00 1/22/97 3 :OOPM 3225 193,764 1,677,976 is.sr 1,000 740,548 1/22/97 16:00 1/22/97 4:00 PM 3237 193,867 1,871,843 17.7° 1,000 800,548 1/22/97 17:00 1 1/22/97 5:00 PM 3209 193,374 2,065,217 19.5V 1,000 860,548 1/22/97 18:00 I 1/22/97 6:00 PM 3164 191,185 2,256,402 21.394 1,000 920,548 1/22/97 19:00 1/22/97 7:00 PM 3097 187,820 2,444,222 23. W 1,000 980,548 1/22/97 20:00 1/22/97 8:00 PM 2983 182,402 2,626,625 24.8«/ 1,000 1,040,548 1/22/97 21:00 1/22/97 9:00 PM 2937 177,607 2,804,232 26.5% 1,000 1,100,548 1/22/97 22:00 1/22/971 0:00 PM 2852 173,669 2,977,901 28.1% 1,000 1,160,548 1/22/97 23:00 1/22/97 11:OOPM 2752 168,121 3,146,021 29.7V 1,000 1,220,548 1/23/97 0:00 1/23/97 12:00 AM 2723 164,236 3,310,257 31.3% 1,000 1,280,548 1/23/97 1:00 1/23/97 1:00 AM 2647 161,083 3,471,340 32.8% 1,000 1,340,548 1/23/97 2:00 1/23/97 2:00 AM 2580 156,792 3,628,131 34.3% 1,000 1,400,548 1/23/97 3:00 1/23/97 3:00 AM 2514 152,809 3,780,940 35.7% 1,000 1,460,548 1/23/97 4:00 1/23/97 4:00 AM 2459 149,185 3,930,125 37.1% 1,000 1,520,548 1/23/97 5:00 1/23/97 5:00 AM 2385 145,316 4,075,441 38.5% 1,000 1,580,548 1/23/97 6:00 1/23/97 6:00 AM 2321 141,177 4,216,618 39.8% 1,000 1,640,548 1/23/97 7:00 1/23/97 7:00 AM 2244 136,935 4,353,553 41.1% 1,000 1,700,548 1/23/97 8:00 1/23/97 8:00 AM 2185 132,855 4,486,407 42.4% 1,000 1,760,548 1/23/97 9:00 1/23/97 9:00 AM 2134 129,550 4,615,957 43.6% 1,000 1,820,548 1/23/97 10:00 1/23/97 10:00 AM 2097 126,927 4,742,885 44.8% 1,000 1,880,548 1/23/97 11:00 1/23/97 1 1 :00 AM 2062 124,777 4,867,661 46.0% 1,000 1,940,548 1/23/97 12:00 1/23/97 12:00 PM 2027 122,664 4,990,325 47.1% 1,000 2,000,548 1/23/97 13:00 1/23/97 1:00 PM 1991 120,534 5,110,859 48.3% 1,000 2,060,548 1/23/97 14:00 1/23/97 2:00 PM 1933 117,722 5,228,581 49.4% 1,000 2,120,548 1/23/97 15:00 1/23/97 3 :OOPM 1887 114,591 5,343,172 50.5% 1,000 2,1 80,548 1 1/23/97 16:00 1/23/97 4:00 PM 1833 111,589 5,454,761 51.5% 1,000 2,240,548 1/23/97 17:00 1/23/97 5:00 PM 1771 108,127 5,562,888 52.5% 1,000 2,300,548 1/23/97 18:00 1/23/97 6:00 PM 1720 104,746 5,667,634 53,5% 1,000 2,360,548 1/23/97 19:00 1/23/97 7:00 PM 1689 102,292 5,769,926 54.5% 1,000 2,420,548 1/23/97 20:00 1/23/97 8:00 PM 1655 100,336 5,870,262 55,4% 1,000 2,480,548 1/23/97 21:00 1/23/97 9:00 PM 1590 97,367 5,967,629 56.3% 1,000 2,540,548 1/23/97 22:00 1/23/97 10:00 PM 1574 94,934 6,062,563 57.2% 1,000 2,600,548 1/23/97 23:00 1/23/97 11:OOPM 1541 93,461 6,156,024 58.1% 1,000 2,660,548 1/24/97 0:00 1/24/97 12:00 AM 1513 91,640 6,247,664 59.0% 1,000 2,720,548 1/24/97 1:00 1/24/97 1:00 AM 1491 90,145 6,337,808 59.8% 1,000 2,780,548 1/24/97 2:00 1/24/97 2:00 AM 1458 88,487 6,426,295 60.7% 1,000 2,840,548 L:\Worfc\2I522\PiqMminWndcdJiydrograplu 2/2/00 Tables i Central Spraf T«talWMcrn*wfrMM 25-, Its »»4 2-Year Star* Evcats 2-Yo 2-year Incremental Volume to Total Volume Serial Dateffime Volume Total Volume % of Total process to process Date TBK MnUlUDC— _J~^T» event (gun) (gallons) (gallons) 1/2497 340 1/2497 340 AM 1448 87.176 6313,471 613% 1,000 2300,548 1/2497 440 1/2497 440 AM 1444 86.764 6,600,235 623% 1,000 2,960348 1/2497 540 1/2497 540 AM 1407 85329 6,685.763 63.1% 1,000 3.020348 1/2497 640 1/2497 640 AM 1406 84364 6,770,127 63.9% 1,000 3,080348 1/2497 740 1/2497 740 AM 1375 83.410 6,853337 64.7% 1,000 3,140348 1/2497 840 1/2497 840 AM 1353 81339 6335376 653% 1,000 3300348 1/2497 940 1/2497 940 AM 1323 80289 7,015.665 662% 1,000 3260348 1/2497 1040 1/2497 1040 AM 1297 78394 7,094,259 67.0% 1,000 3320.548 1/2497 1140 1/2497 1140 AM 1275 77,152 7,171,411 67.7% 1,000 3380348 1/2497 1240 1/2497 1240PM 1253 75,852 7,247,263 68.4% 1,000 3.440348 1/2497 1340 1/2497 140PM 1233 74379 7321342 69.1% 1.000 3300348 1/2497 1440 1/2497 240PM 1212 73333 7395,174 69.8% 1,000 3360,548 /2497 1540 1/2497 340PM 1192 72.114 7,467,288 703% 1.000 3,620348 /2497 1640 1/2497 440PM 1161 70397 7337,885 712% 1,000 3,680348 1/2497 1740 1/2497 540PM 1131 68.754 7,606,639 713% 1,000 3,740348 1/2497 1840 1/2497 640PM 1102 66366 7,673,606 723% 1,000 3,800348 1/2497 1940 1/2497 740PM 1087 65.648 7.739,254 73.1% 1,000 3.860348 1/2497 2040 1/2497 840PM 1072 64.745 7,803399 73.7% 1,000 3.920348 1/2497 2140 1/2497 940PM 1057 63342 7,867341 74J% 1,000 3.980.548 1/2497 2240 1/2497 1040PM 1035 62.758 7330399 74.9% 1,000 4.040348 1/2497 2340 1/2497 1140PM 1014 61.494 7392,094 753% 1,000 4.100348 1/2597 040 1/2597 1240 AM 993 60230 8.052324 76.0% 993 4,160347 1/2597 140 1/2597 140 AM 980 59,201 8.111324 76.6% 980 4219347 1/2597 240 1/2597 240 AM 967 58,406 8.169330 77.1% 967 4277,954 1/2597 340 1/2597 340 AM 954 57,611 8327342 77.7% 954 4335365 1/2597 440 1/2597 440 AM 937 56,708 8384350 782% 937 4392273 1/2597 540 1/2597 540 AM 920 55,697 8339347 783% 920 4.447^70 1/2597 640 1/2597 640 AM 903 54.686 8394,633 79 J% 903 4.502,656 1/2597 740 1/2597 740 AM 891 53.819 8.448,452 793% 891 4,556,475 1/2597 840 1/2597 840 AM 879 53,096 8301348 803% 879 4,609371 1/2597 940 1/2597 940 AM 867 52374 8353322 803% 867 4,661,945 1/2597 1040 1/2597 1040 AM 850 51307 8,605,429 813% 850 4,713,452 1/2597 1140 1/2597 1140 AM 833 50.496 8.655325 81.7% 833 4,763,948! 1/2597 1240 1/2597 1240PM 816 49.484 8,705.409 822% 816 4,813,433 172597 1340 1/2597 140PM 806 48,672 8.754.081 82.7% 806 4,862,104 1/2597 1440 1/2597 240PM 796 48,058 8.802,139 83.1% 796 4,910,162 1/2597 1540 1/2597 340PM 786 47.444 8,849382 83.6% 786 4,957,606 1/2597 1640 1/2597 440PM 771 46,685 8,896268 84.0% 771 5,004291 1/2597 1740 1/2597 540PM 756 45.782 8,942,050 84.4% 756 5,050,073 1/2597 1840 1/2597 640PM 740 44379 8.986329 84.9% 740 5,094,952 1/2597 1940 1/2597 740PM 728 44.066 9,030395 853% 728 5,139,018 1/2597 2040 1/2597 840PM 716 43344 9,074339 85.7% 716 5,182,362 1/2597 2140 1/2597 940PM 704 42.622 9.116361 86.1% 704 5224.984 1/2597 2240 1/2597 1040PM 689 41.809 9.158.770 863% 689 5266,793 1/2597 2340 1/2597 1140PM 674 40306 9,199,676 86.9% 674 5307,699 1/2697 040 1/2697 1240 AM 659 40,003 9.239,678 872% 659 5347.702 1/2697 140 1/2697 140 AM 650 39,280 9.278359 87.6% 650 5386,982 1/2697 240 1/2697 240 AM 641 38,739 9317,698 88.0% 641 5,425,721 1/2697 340 1/2697 340 AM 632 38,197 9355,895 883% 632 5,463,918 1/2697 440 1/2697 440 AM 620 37365 9393,459 88.7% 620 5301,482 1/2697 540 1/2697 540 AM 608 36342 9.430302 89.0% 608 5338325 Table 5 Illinois Central Spring Total Water Flow from 25-, 10-, and 2-Year Storm Events 2-Year Storm Design Event *2-ycar Incremental Volume to Total Volume Serial Date/Time design Volume Total Volume % of Total process to process Date Time Number event (gpm) (gallons) (gallons) Volume (gpm) (gallons) 1/26/9 7 6:00 1/26/97 6:00 AM 596 36,120 9,466,422 89.4«/6 59.6 5,574,445 1/26/9 7 7:00 1/26/97 7:00 AM 590 35,578 9,502,00(D 89.70/'. 591D 5,610,023 1/26/9'7 8:00 1/26/97 8:00 AM 584 35,217 9,537,217 90.1* 58I 5,645,240 1/26/9'7 9:00 1/26/97 9:00 AM 57g 34,855 9,572,07.} 90.40/i 571J 5,680,096 1/26/9'1 10:00 1/26/97 1 0:00 AM 569 34,40-* 9,606,477 90.70/'o 56') 5,714,500 1/26/9'? 11:00 1/26/97 11:00 AM 569 33,86} 9,640,34)) 91.00/i 56<) 5,748,363 1/26/9' 12:00 1/26/97 12:00 PM 55 33,32 9,673,66<) 91.3*, 551 5,781,683 1/26/9T 13:00 1/26/97 1:00 PM 54: 32,8 If5 9,706,47!i 91. 7°/• 543 5,814,498 1/26/97 14:00 1/26/97 2:00 PM 53^ 32,34!> 9,738,821 92.0%, 53f 5,846,844 1/26/97 15:00 1/26/97 3:00 PM 52' 31,87<> 9,770,691' 92.3%• 521 5,878,720 1/26/97 16:00 1/26/97 4:00 PM 51' 31,334 9,802,031 92.6% 517 5,910,054 1/26/97 17:00 1/26/97 5:00 PM 50"! 30.72C 9,832,751 92.80/. 507 5,940,774 1/26/97 18:00 1/26/97 6:00 PM 497 30,106 9,862,857 93.1% 497 5,970,880 1/26/97 19:00 1/26/97 7:00 PM 491 29,618 9,892,475 93.4% 491 6,000,498 1/26/97 20:00 1/26/97 8:00 PM 485 29,257 9,921,732 93.7% 485 6,029,755 1/26/97 21:00 1/26/97 9:00 PM 479 28,896 9,950,628 94.0% 479 6,058,651 1/26/97 22:00 1/26/97 10:00 PM 473 28,535 9,979,163 94.2% 473 6,087,186 1/26/97 23:00 1/26/97 11:OOPM 467 28,174 10,007,337 94.5% 467 6,115,360 1/27/97 0:00 1/27/97 12:00 AM 461 27,812 10,035,149 94.8% 461 6,143,172 1/27/97 1:00 1/27/97 1:00 AM 454 27,433 10,062,582 95.0% 454 6,170,605 1/27/97 2:00 1/27/97 2:00 AM 447 27,036 10,089,618 95.3% 447 6,197,641 1/27/97 3:00 1/27/97 3:00 AM 441 26,638 10,116,257 95.5% 441 6,224,280 1/27/97 4:00 1/27/97 4:00 AM 432 26,187 10,142,444 95.8% 432 6,250,467 1/27/97 5:00 1/27/97 5:00 AM 424 25,681 10,168,125 96.0% 424 6,276,148 1/27/97 6:00 1/27/97 6:00 AM 415 25,176 10,193,301 96.3% 415 6,301,324 1/27/97 7:00 1/27/97 7:00 AM 409 24,742 10,218,043 96.5% 409 6,326,066 1/27/97 8:00 1/27/97 8:00 AM 403 24,381 10,242,424 96.7% 403 6,350,447 1/27/97 9:00 1/27/97 9:00 AM 397 24,020 10,266,444 96.9% 397 6,374,467 1/27/97 10:00 1/27/9T 10:00 AM 391 23,659 10,290,102 97.2% 391 6,398,125 1/27/97 11:00 1/27/97 11:00 AM 385 23,297 10,313,400 97.4% 385 6,421,423 1/27/97 12:00 1/27/97 12:OOPM 379 22,936 10,336,336 97.6% 379 6,444,359 1/27/97 13:00 1/27/97 1:00 PM 374 22,611 10,358,947 97.8% 374 6,466,970 1/27/97 14:00 1/27/97 2:00 PM 370 22,322 10,381,269 98.0% 370 6,489,292 1/27/97 15:00 1/27/97 3:00 PM 365 22,033 10,403,302 98.2% 365 6,511,325 1/27/97 16:00 1/27/97 4:00 PM 361 21,762 10,425,065 98.4% 361 6,533,088 1/27/97 17:00 1/27/97 5:00 PM 356 21,509 10,446,574 98.6% 356 6,554,597 1/27/97 18:00 1/27/97 6:00 PM 352 21,257 10,467,831 98.8% 352 6,575,854 1/27/97 19:00 1/27/97 7:00 PM 348 21,004 10,488,834 99.0% 348 6,596,858 1/27/97 20:00 1/27/97 8:00 PM 344 20,751 10,509,585 99.2% 344 6,617,608 1/27/97 21:00 1/27/97 9:00 PM 340 20,498 10,530,083 99.4% 340 6,638,107 1/27/97 22:00 1/27/97 10:00 PM 336 20,272 10,550,356 99.6% 336 6,658,379 1/27/97 23:00 1/27/97 11:OOPM 333 20,074 10,570,430 99.8% 333 6,678,453 1/28/97 0:00 1/28/97 12:00 AM 330 19,875 10,590,305 100.0% 330 6,698,328 total to water from storm = 1 0,590,305 total to water to process = 6,698,328 total to storage tanks - 1 ,300,000 total water bypassed = 2,591,977 L:\Woric\2852SPrpjAdmin\ertendid_hydrogriphl 2/2/00 ATTACHMENT 2 MEMO Date: February 2,2000 To: Barry Christian cc: From: Aaron Volkening n* Subject: Project 28522, U.S. EPA Illinois Central Springs, Hydrology for Design Storm Events This memo summarizes the methodology, assumptions, and results of the analysis performed to estimate 2- and 10-year peak storm flows at the Illinois Central Springs project site. I also summarized the ^ ^ methodology used to generate extended design storm hydrographs. ESTIMATION OF PEAK FLOWS / SCALING FACTORS FOR TWO- AND TEN-YEAR STORMS Previously, a design hydrograph for the 25-year, 6-hour rainfall event was generated by Earth Tech. This analysis was described in a December 18, 1998 memo from Garth Greenan to Barry Christian. The regression equation presented in a January 1998 report from CBS Corporation was used to predict the peak flow for the 25-year event. This peak flow was then divided by the peak flow from a selected base storm that started on January 22, 1997 to obtain a "scaling factor". To obtain a complete hydrograph for the 25-year event, each flow measurement from the January 1997 event was multiplied by this scaling factor. The objective of the most recent analysis was to calculate similar peak flows and scaling factors for the two- and ten-year storm events. A six-hour storm duration was used in all cases. The regression : equation from the T998 CBS study was again used to predict peak flows. There are four input variables in this equation, for which values must be entered. In the selection of these input variables, I was as mj^ consistent as possible with the methodology used to generate the 25-year peak flow. I reviewed Garth ' Greenan's file and was able to very closely determine the values that he selected for these input variables, : but not how he derived them. You and I telephoned him and he was unable to fully recall his derivation methods. The following section describes my definition of the required input into the regression equation, the sources of this input, and differences with the 1998 Earth Tech analysis. Required input into regression equation: 1. Total rainfall (inches): The total rainfall for the storm event is required. This data was taken from rainfall maps prepared by the Soil Conservation Service for the state of Indiana. These maps, in turn, appear to be based on the U.S. Dept. of Commerce Weather Bureau's Technical Paper No. 40. Technical Paper 40 is the most widely used reference on rainfall design events, at least in the Midwest. Rainfall depths were rounded to the nearest 0.05 inches. The total rainfall depth for the 2- year event is 2.30 inches, and the total rainfall depth for the 10-year event is 3.25 inches. Technical Paper 40 also appears to be the source of the total rainfafJ depth used in the 1998 Earth Tech analysis to determine the 25-year flow. EARTH ^s] TRC A tijCO INTfKNA-nONAL LTD. COMPANY \\grT50l\dau\WorkV28522\ProjAdmin\hydro_memo_020IOO_BJCmai1aip.doc February 2,2000 Page2 2, Maximum 3-hour rainfall (inches): The maximum amount of rainfall during any continuous three hour portion of the overall storm is also required. To determine this value, information on the pattern of rainfall during the storm is necessary. Since the design events in question are not based on actual monitoring data, a rainfall distribution must be assumed. An "SCS Type IF rainfall distribution was used. This is one of the most common rainfall distributions used in hydrologic analysis. For an SCS Type n rainfall event, approximately 75.4% of the total rainfall amount falls during die most intense three hours. Therefore, die 3-bour rainfall amount for die 2-year storm is 1.73 inches. The 3-hour rainfall amount for die 10-year storm is 2.45 inches. It is not clear bow the 3-hour rainfall amount was determined in the 1998 Earth Tech analysis. The spreadsheet from that analysis shows that the same rainfall amount was used for both die total rainfall depth and die 3-bour rainfall depth. The reason for this is unclear. The 3-bour rainfall depth should be less than the overall 6-hour rainfall depth. Garth Greenan stated in our January 31, 2000 phone conversation that he could not recall bow the precipitation inputs for die total storm and 3-hour interval were computed. One possibility is that the three-hour rainfall depth was estimated from rainfall intensity-duration-frequency curves for the city of Indianapolis, while die six hour depth was estimated from the TP40-based maps. 3. Pie-storm flow (gpm): The flow from die spring prior to the beginning of die rainfall/runoff event is required. Judgment is required to estimate this value, as baseflow in the spring varies widely, and pre-stonn baseflow is independent of die storm event The 1998 CBS study showed that pre-stonn flows in die spring were typically less than 300 gpm, ahhongh a maximum pre-stonn flow of 1,937 gpm was reached. In die 1998 Earth Tech analysis, a pre-stonn flow of 1,000 gpm was used. This flow rate is higher than die average flow, but certainly within die range of possible flow rates. In our phone conversation, Garth Greenan stated that die 1,000 gpm value was likely chosen as a conservative but realistic value. This value was again used in the most recent analysis. Again, it is emphasized thatdib is a somewhat subjective input 4. Season variable: A season variable is required to account for seasonal differences in evapotranspiration. This variable can take the values one or zero. The CBS report states that a value of zoo is generally used for the period from mid-June to mid-November, and a value of one used during the remainder of die year. The use of a value of one will produce higher peak flows than the use of a value of zero, if all other inputs into the regression equation are equal. A conservative value of one was used in the most recent analysis.. A value of one was also used in die 1998 Earth Tech analysis. Entering the input described above into die regression equation, the following results were obtained. The predicted peak flow resulting from die 2-year, 6-hour storm is 3,300 gpm. Dividmg this value by the measured January 22,1997 (January 1997) peak flow of 1,827 gpm gives a scaling factor of 1.806. The predicted peak flow resulting from the 10-year, 6-bour storm is 4,279 gpm. Dividmg this value by the measured January 1997 peak flow of 1,827 gpm gives a scaling factor of 2342. E A • T BJCi February 2, 2000 Page 3 Additional notes: Since the 1998 Earth Tech analysis was done, additional monitoring data on rainfall and flow has been provided by CBS. Previously, documents were prepared describing Earth Tech's conclusions from reviewing this data and other comments provided by CBS. I have not reviewed these documents in detail. It is my understanding that although the additional data may offer a better base storm than the January 1997 event, the January 1997 storm was the best available event upon which to base the design when Earth Tech's previous analysis was performed. To keep as much consistency as possible with previous work, the January 1997 event was retained as the base storm. The memo from Garth Greenan to Barry Christian dated December 18, 1998 describes additional assumptions and methodologies relating to the 1998 Earth Tech analysis. These comments are also applicable to the most recent analysis, except for the differences described above. GENERATION OF EXTENDED DESIGN STORM HYDROGRAPHS As discussed above, the January 22, 1997 event was used as a base storm to generate design hydrographs for the 2-, 10- and 25-year events. However, data from the January 1997 event could not be used to generate the entire falling limb of the design hydrograph. Approximately 54 hours after the January 1997 event began, another rainfall occurred, and flow in the spring began to increase again. When the second rainfall occurred, flow rates had not yet returned to pre-storm levels. Thus, the January 1997 data does not accurately reflect the response of the spring to a single rainfall event over the entire duration of the storm hydrograph. To analyze the peFformance of the treatment system over the entire length of a design storm, it was therefore necessary to extend the base storm hydrograph until flow values reached pre-storm levels. This was done by graphically estimating the shape of the extended recession limb. The slope of the recession curve for the January 1997 event prior to the subsequent rainfall was used as a starting point. The curve was then extended outward until the pre-storm flow value was reached. A flow value of 182 gpm was chosen to indicate the end of the base storm hydrograph. This value was chosen because it was the last measured flow value in the spring before the first January 1997 rainfall began. Previously, Earth Tech had synthetically extended the 25-year design hydrograph based on a formula which averaged recession curve shapes for a collection of monitored storms at the spring. This method was not used in the most recent analysis for several reasons. First, the reasons for the use of some of the specific factors in the formula are not known at this time. Second, due to the use of the formula, the shape of the synthetic hydrograph following the peak does not exactly match the shape of the base storm hydrograph. However, this synthetic hydrograph was compared to the new extended base hydrograph, and the tail areas matched well. This provided a check on the reasonableness of the new extended base hydrograph. EARTH fa? I T E C H hydro_memo_020100_BJC markup