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TEE 222:2. 2222: 2.2222222; 2:22? 222E Ema-22322222222 W855 .222 2.222222222222222. 2E maintainEd 222' the invEE' E21222 I 222222. 12322223 E2221 223222222192 22222 222E gates WEE and $22 WEE E23222: End 23.25 E222 222.2222 52222222222 222222222 En EmergEmy SSE- appremma?zely 8-52) E222 222E '72?th 22222222'2'2222-22222'1 222222.22- Ewing 2222-72 22222222223222.2222 TEE 22222522222 WEE. E2222 22.2.2 2222222 Ennis Ef EFEEMEE 2'22 222E E2222E2E2E 222222-2222 222223.222 E2 22223225 :22? E22225: 222 2:26: during. 22222: nExi: 22222222222 :22 222 .2 Phatas?iaken? YES NE: . I mam ?fmw?wm 5i24?2?17 5 2:2: 2222 GwnE-z- 2322.22.22 82" 1'3; 1'02?69} 322222222 '3 222 Qi?gw INSPECTION DAM AND RESERVOIR IN STATUS Name of Dam Vermilion Valley Darn Dam No_ 104-23 Date of inspection 5124/ 201 7 Observations and Comments Seepage Vermilion Valley Dam was built on moraine soils and glacial deposits and has a history of seepage at various locations cf the toe of the dam and the seepage varies based on. the reservoir elevation. At the time of the inspection, the reservoir was approximateiy 42% full and increasing due to the large snow pack and runoff. There was no visible seepage on the slope of the dam, either of the abutments, or either groin of the dam. During the inspection, there was seepage noted at the most of the monitoring locations below the toe and the values recorded during the inspection are listed below: Location Reiglir?gieg?n) Threshold Levels (gpm) West End Weir Dry 0 150 East End Weir Dry 0 30 Weir 8+00 35.1 25.5 265 Weir 8+00 Lower Did not inspect 25.5 240 Tunnel Weir Did not inspect Note* 2 60 100 400 28+25 726 807 1300 Aux Drain 1 46.5 57 220 Aux Drain 2 55.3 44 170 Red Ditch Weir 1004 1182 1900 Note" - SCE is reuevaluating the tunnel weir readings due to a confined space reclassification as all confined spaces as permit required confined space. These seepage readings were not read during the inspection as a confined space permit was needed and the tunnel leading to the upstream gate was not inspected as the low level outlets were fully cycled during the last inspection. All monitoring locations are equipped with 90? v-notch weirs except for weir 28+25 which as a 24- inch rectangular weir. The seepage at all of the weirs are considered normal and within historic limits. Weir 8+00 and Weir 8+00 Lower have only experienced seepage twice since the extension of the toe drain in 2007' and may need to have threshold values updated after a few additional high water years. At the Red Ditch Weir gauging station, a rating curve needs to be placed in the station as it was missing at the time of the inspection. Instrumentation at this dam consists of 43 piezometers, ?16 embankment survey monuments, and 10 seepage weirs. The latest instrumentation submittal dated May 2017 and covers the 2016 calendar year. All observations, evaluations and analysis conclude that the dam is performing as designed. Piezometers: The piezometers are monitored when the reservoir is low and the frequency is increased to and then to weekly as the reservoir level increases. The data shows that the piezometers 101-107 generally respond to reservoir elevation with no increasing trends. Piezometers 108, 110-112 do not react to reservoir elevations but show variation between the readings. Outlet Tunnel Piezometers and P-29 show changes that respond to reservoir Sheet 2 of 6 {gm ma {2m ram :26me Nam 533"? vammw Wiley Dam. N0, Daie of Ins-pacfion 51:22-42! 20 ?i5 37? ?h?ewa?mm and . . eievat?m, SSE lam-rimmed {mi-y we taming at ?xe- {Ewe-t Yuma-E pieznmetergz?ua is: summed spam; Ni tau?Leak {wet-s during the rapar?ng paried far- the {siemmetam were wai-i aetiw iesva?a amzs? cans'istg?t wiih his-misgi- readings with $313 rasawair at a simiiaf a?eva?g?. ?ewsme?i "The: dam has. 15 mway mwmm?ems- that are iypiaa?y? gum-eyed awry ?m years). Na Si?i?ki?y was cm?uci?a? diifii?g me 281-83 rem'tingg- mam. The aii?gnmem nmasurenmn?g dam is: :07 2.1315. AH {am-mush Seitiema?i- mints-a- iak?? in K) 11.? are within ?feet in giava?cion the. read'i'n93 En The next survey is; miwmme? ?fo Sayer-a: is; mar?tma?d at. amiss. Swmga is; manim-re?i mmhiy when 163w and the: fraquamy is; imrreased 3ft). bi?-m0nth?y and {hes-n it) waekiy ass- the .rassermir {we} increagag, Baring the mmrii-ng perms, :ai? sewage wadi?gs were w?fh?-n 'thraah?id iamia The geapageae mmitered between ?5933 $516? 2315 ware 'refaiiwiy law due..- the draught; Sewage vaiuass. absewe? timing- the Emma-diam were higher Elma fa the regent rains and the: resarvoizz? Lava? i-nqreaesihg due it) a. ?-arga gmawpask in fhe mountaim. - The at this; dam the. dam to marinara; to be perm-?ring ssafigfacmriiy and no Raw 'E'nsirumei?ia?m E?s judg?d meessai?y at W3. time; . ?Kk??x ?x .. wi?x?; u. .. ?$23.5 Kama Phota 4 Lam?hg mm the . stream HuhDWR 1:231 Ska-:31 3_ a? 6' $.93 yaw WZ mauwmw?m Zw3m Gamma: Um.3323: m?h?oww 9. . . . XIVFX . . . . ...1375.? 9/ .. . . .49. . . 9. Mw?/x . ..9. he.? .. . . .. .. ..MM. . ?a?xy?w. 7 1. W97 .. .. {Iv/Mamam? mg? mam Emma .3 gag: ?mm magma an: 33% .3. 5% magma .9ch a. Q. 3333333?. 33.3 33.3. 33333433 3 33. 3.3.3.4.. 3333 .?m?xwma? Emma . . . 033 Ra. mewsmw. 53m. 33933.3 . m??mg .. ., . 44/ {ft/fxuh/u. (.fuwaw-qu - 1/ {we/VJ3393 .3. . . 33. 33433.3.? 33343 4 .9333, I. {in} .r .?uv I 4/4 y, . in?ll.11?yuan/.11.. {Ia/Mine. Wr/ .. ?43. n33. m. .3333: 833, 3333. 4.333303 3.3.. 3.3.. mzw? m. 3 m. ?g?m ?mm 2% . ?mm. mwa??cm Ea {mmimmgz??mm mama .. $3 20.. ?ggmm Ema 2. ?.3333: .mxm?maa? H. ran/Z, 71xmagma m. a -- STATE-BF . x; SAFETY GF {333% 5% AAxmx cf?am 53m . _me Asa, ?30493 C-oxxtx Frame: ?A?xpx-oA-?AAx-m Earth 9mm Chennai Water ix -. $35.3 fax? $363102? and 8313 {ext ?eii?w i-dam rarest maxi {63AZA'AsnAaxtx made ?aw-am Safari, 33;: Kimbi-er aft-d Ca?fwr?ia (SEE) ?zaamn'fm A'Azxxec?xn $386333 maxim Cycling cf the; xii-da-gata arm HEA- vaixe._ Taken Th_xi?t?x gate We fun-AA Aiming Franz: and Visa-at the dam, A'xsewxir, and Aha exaggurtemamxx jixAA-igxxd safxa use. - a?e?f? {Ea?xmg?m gm; Th_ 2- upstream - ga?x a dawns?exm waive. the inxpac?xm; upxtrexxAA- gate was and Aha was Amer: and raiseasi'ng appraximaiafy 24.8 Eif-?x? i-?A?AthOna The dilW?E-?xifeam gate was; {Am-y wen-ad. and rekxas?xad 49.3 {33?s 3% Open. it? wax aim-sad, by hand affirm b?ca'ux'e afar;- upgzree'r _iimiit'er aiecir?caf issuax Tim aledridian was; amiss-AA)- fixsthe' pmbiam and the gaia was-M13! A pmweded upstream fhmug?h the maxi tame} .upsiraa-m vat?Ara c-h-ambarwhara SSE xta?ff waned the: bypass waive and than fuiiy 0195?de and {hen ?Wen-ea the upstream Q'Eii? Wi?mt? Amid-Amt. The ugAxAranm - waive- is used, 43:: quumizxx in this: exam: pipe. white - Aha ups?AA-?xaAA?A - gate is being waxed. Gate Aha Qatx had be?? fLA'iAy o'px?eci, i118: LA-Ajsirexam - 'AA-a-tve was and? the {fawns-A'ream xaiva was cranked ramm meixxge ?aws. Tina?AA. mufiat fume? was i'?spe'xx?siad duringz'ma w?hii?a waking hr: A?mm Aha u?strxam chamber. The ?in?ux; was mean am): no signs m? leakage, cracking ?1th Axxiix Signx eff deier?'xzr'aiim. cam an emergency, SSE can mix-axe ammximaieiy 3AA: Ami" {if the suite? under Assam. inspeo?e? E, ?9?va Ph?ims faken? "3?38 NOK Date af- irA-smalciim 3329?? 5 chi'fm - 1:3an DWR 1261' (Rx-Au. A of . :3 EN- ix?? xiv? . . EVA 2'5; 55 $5525 252525 55 52.225522232222 '32 . 75 5 {522502222222 2222222125222. 5522222222255 5525232523 NW N. QF EN. 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DAM AND RESERVOIR IN STATUS Name of Dam Valley Dam Dam No. 104-23 Date of Inspection 9/17/2015 Observations and Comments Seepage Vermilion Valley Dam was built on moraine soils and glacial deposits and has a history of seepage at various locations of the toe of the dam and the seepage varies based on the reservoir elevation. At the time of the inspection, the reservoir was very low, significantly reducing the seepage vaiues. There was no visible seepage on the slope of the dam, either of the abutments, or either groin of the dam. During the inspection, there was seepage noted at the five monitoring locations below the toe and the values recorded during the inspection are listed below: Location Threshold Levels (gpm) West End Weir Dry 0 150 East End Weir Dry 0 30 Weir 8+00 Dry 0 265 Weir 8+00 Lower Dry 0 240 Tunnel Weir Dry 1.4 2 0.2 8 400 28+25 302 408 1300 Aux Drain 1 2.7 10 220 Aux Drain 2 11.5 27 170 Red Ditch Weir 430 669 1900 All monitoring locations are equipped with 90? v?notch weirs except for weir 28+25 which as a 24- inch rectangular weir. The seepage atall of the weirs are considered normal and within historic limits. Weir 8+00 and Weir 8+00 Lower have only experienced seepage twice since the extension of the toe drain in 2007 and may need to have threshold values updated after a few additional high water years. Instrumentation at this dam consists of 43 piezometers, 16 embankment survey monuments, and 10 seepage weirs. The latest instrumentation submittal was received on May 21, 2015 and covers the 2014 calendar year. SCE submitted an abbreviated report that contains the long term seepage and settlement plots along with findings, field observations and inspection reports, instrumentation evaluations, and an engineering analysis. Ali observations, evaluations and analysis conclude that the dam is performing as designed. Piezometers: The piezometers are monitored when the reservoir is low and the frequency is increased to and then to weekly as the reservoir level increases. The data shows that the piezometers 101-107 generally respond to reservoir elevation with no increasing trends. Piezometers 108, 110-112 do not react to reservoir elevations but show variation between the readings. Outlet Tunnel Piezometers P-26 and P-29 show changes that respond to reservoir elevation. All peak levels during the reporting period for the piezometers were well beiow action levels. Sheet 2 of 6 I ravw' '3 . 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Sag-mm. wax-1.. my, mummy-?mag. .me ?my-M dr- xx,? .Hd?y .5. .. xix . 7-7? MC .2 Mil/mfg . 7/7 yawzymyuwwg?/ hwy, E35 may . -- my MK md?m?m )2 Eng . .3320, .5?mm I m3. .EME .. . .z xx .0. r/ .Hya . I. .r yx/x?/ . anyHz?. .x . $30.3 . ,w .. . . crap/2? my u/MAW/.11?ax/Wm a in ma?a mamas. a: Em a mum. Ham?. #5 magi 02% may. gamma .8. am. $33? 3% ?mi Emma m. a. I WR. 21.2.51 (grew. ELEME- 's ?tar? 9mm 7? .5. The Sea-wise- Sp?i?way aipmared' to be? Era sat; . w. . A-?kk' A . .- .5 Name {sf mm "sfers?ilim Vai?iey? {Jam . . . {1311:3649,? 4&.43? ?new3W5, - I . '7 . {wry-an7'55. 5.x Westo- f? ?nam?? angia (31? fhe $33133 i {3f ins {Siam pew: an an can tha dawnsima'm $309433. ?x {3341144;"9. 53 3 5?5 ATATE AFAALAQAMA A WATER - 2422-on [323 SAF [322? [32222.23 A-EATEFEEA [22"23222222 VArmi?An V'Ai-lAy Dar-22' NA. Comm "[22923- Apmway feet hei?w Ap?hmy ereAt 9?51 dam-cres?t. Weather A2223 F) [sent-[2AA [1223229. [2233222 'PAriA'di-A A22 1. ['22 "Farm-Ah! [23am [Am-awed. [3222222. [[2222 [awn [[22?[2[[22a[2[222 A2222 22:2 [22.222 [[2222 [2222322- A2222 A A222222AA2A Egg; unifurm, The [23? [ha [212 [.223 [he The AntirA- dawns-[ream ?ght gmin and was: AA Large: [3222212322223 [[2332 [2 2522-2232 hAi'p [he Affnmad AAhiciA [[Affic AppAar AA- hAipmg BAA AbuthmA [sound 22222;! [2312 AA: A2g2222; [:22 [nAtAAhty The dawnAtream grains Ali [2212 and had [2222 [signs of any Arasmng. The .02? the A3222 [23: ['22 As; [[2923 was [2:32 evidence [22? A2233 seepage. [32* There [2.23 [[22 [he AA'ri'm-Ater Tierzaghi have been rem'?VAC'i. [Aptings- need 2232 [222. Ah A?mai: [ea-AA that [22:2 AA-AA222A w?hin [he .S?Qii?lwag Appmach SAHAAI: the AAWEAA -. Abutment were A2232 [22 Aa?sfacmry [22322:[222022 '2 The. [swim-i 03' [he AmArgAnAy A AA: 2.223222. ware A5232: Af'Any [[222 [pr lining of the ['22 AAi?iszA?A?y AANA During the ALA. upstream. [2pm [[2222 Apprexumately 273 62:22 [223-[2 M23223 The upsAAam and: dawns-[imam [232% [Are during; the gait-A. CAASAA [1222' 222.91 20. [:22 . AA-SA [22" A22 A?-?i?i?gen?y, can: 8523? 02A out [:22c [he autiet. "The 2292? The A2222 2222- 313522222 23? cracking [22 Aancmte [22 AIEQAA A VAETAA Elam WAS A22 [no-[Ame and and [222.22- A 'hiAfn-[y 222222210233 of [2f the: And} the [322 [[223- Art [22? [he [[2222 vary Azgm?cgn?y [Aducmg by E. A ?2 Ph-?Jt?s WWI . Date {if-3939893911 812?]02222-227800? {3.318. 0.2 912 222.2924 DWR 2 2222 2222-322} '1 [2f 8- IINSPECTIOL 1F DAM AND RESERVOIR IN FIED STATUS Name of Dam Vermilion Valley Dam Darn No. 104-23 Dateof Inspection 8/27/2014 Observations and Comments the seepage values. There was no visible seepage on the slope of the dam, either of the abutments, or either groin of the dam. There was seepage noted at the nine monitoring locations below the toe and the values recorded during the inspection are listed below: Location Rezeglsg?apkm) Threshold Levels (gpm) West End Weir Dry 0 150 East End Weir Dry 0 30 Weir 8+00 Dry 0 130 Weir 8+00 Lower Dry 5 170 Tunnel Weir Dry 1.3 2 .1 34 400 28+25 322 572 1300 Aux Drain 1 3.6 20 220 Aux Drain 2 13.4 24 170 Big Red Ditch 430 806 All monitoring locations are equipped with 90? v?notch weirs except for weir 28+25 which as a 24- inch rectangular weir. The seepage at all of the weirs are considered normal and within historic limits. Weir TD1 and TD1A have been abandoned in place after SCE and the Part 12D board of consultants concurred that other monitoring wells and piezometers can sufficiently measure the phreatic surface and seepage. Weir 8+00 and Weir 8+00 Lower have only experienced seepage twice since the extension of the toe drain in 2007 and may need to have threshold values updated after a few additional high water years. Instrumentation at this dam consists of 43 piezometers, 16 embankment survey monuments, and 10 seepage weirs. The latest instrumentation submittal was received on April 10, 2014 and covers the 2013 calendar year. SCE submitted an abbreviated report that contains the long term seepage and settlement plots along with findings, field observations and inspection reports, instrumentation evaluations, and an engineering analysis. All observations, evaluations and analysis conclude that the dam is performing as designed. Piezometers: The piezometers are monitored when the reservoir is low and the frequency is increased to and then to weekly as the reservoir level increases. The data shows that the piezometers generally respond to reservoir elevation with no increasing trends. The piezometer readings were reported from 2004-2013. All peak levels during the reporting period for the piezometers were well below action levels. Settlement Monuments: The dam has 16 survey monuments that are typically surveyed every five years. No survey was conducted during the 2013 reporting period. The alignment measurements data is from 1997 to 2012. All conduit settlement points taken in 2012 are withir?in Sheet 2 of 6 TENN NFNENVNEN EN 3TH HEN Name ef II I I I I I?am N0. 11347-213 a?gam? Date of .1 ms a-Ms?rmnmeatam?m fmm? ma initiai pea-dingy; in 1919?. The maximum .hi'smrimfEasit?emem 31? S?ar 3-929 with a . Nat?emenf The {$253243- sstN-y fess? W193 Neeguage Sewage is mmimrad at. weira. Sewage menitare?. mo?nthiy when the: teaser-mix" is MW and thafraqaemy is: increased to and? than; ?its: week-3y 3% We :?eaaw-Qir Few: Ewing {ha 2.31.33 i-??p??ihg pa?iad. Ni; Nagpage regain-gs ware within f?r?esmid iemis. The at this dam cia?m it) ?it: he. and rm WW judged wee-assaz?y .31 this; ?rm. W?i??f Jae-veg} is in {he DWP. 1251 grew. ma?a) 5:th 3 6? ??wm 2%.me mamwwag? mm?. Mumm?w g2? ?25% 2.me . . . . . .023 25 Ema NW 2.2/22 22/22,, :11. 2. . . ?2323 1. Sega. m? W32 2.3 9% 2,232 33 31? 2,22%, 2/ 22.2., . 21.1.. I. A til/(fa. .r 22,222,22/22 .2 . .n 2.. fir/.2 ay??ww/M?/ .. gr .yv. ?22/22227222222 2222/2222 22.2 $393 2 rm 1. . . I. exam $2,223? $2 any? a mg $2 ?Ema ma?a. 2mm?. ma?a. A mm ullnnilnillinluuz awn m?w? warm/mm. mim?d?wm 22% 032.3 gnawing ?ag . . . . .mmg a? .wmkamm Dam ow. .. mwm?mmufw gum/J 1.40% ,?x522 5 @503 kw waoxmm? my? 3m $333 m?mwm .mme away magma?; 493$. ?magma. m3 Mm?m . it. ., aging$1.29.va mama a im1 .3 ..- mam ma 5% Eat Manama.? Em. Em ?ng may E. 339.3. 32m Nguf . a: . . . . .. (.1. . Meek: 92330$me 5mg?? a ?3 wwzwEmm?ag? @335 mum. an mg. 3% 0 WW "0 {2213291 . . . . 00.30.0000:3:031:00: 000000000 AGENEY . 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Th0 0?0-0rc300h. 00000: 0001300., 0:20 000::000000': 0:0: 0:200 0:00:00003: 00:20:03,: {0:30:00 the: righ: 00:00:00,. 00:0 02100.: 00: 0::j00ti0000i0- 0:10:10 0:20: in 0000:0003? 0000:000. T00 .00 :00 0f :00 0010:9000}: 00:30:03! 30-00 in 0000:0020: 0.0::diti0n. $000: The? 00000.0 0.: - 0000000: -g.0't'0 .000 00:00 ?30000 the: 00000000 :00 0000000: - 00:00 0:00 01:30:: 000.? :00 00:00 W00 000:: 0.00 r030100-ing 438 0:0 M000 3:000. The 00.00000: 00:0 W00 020150310000 00009 2:10 100000000 .000 ins; 00000:: by E. A \Nuiff 3:33:00 3 0.. Fit-20:00 $0002 YES NO E. 0:0 0? trig-30013.00 3 for 000003000 00:: 0: 05000:: 12:20 :3 0:00:20: {Rant-010:1} i 7 INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Vermilion Valley Dam Dam No. 104?23 Date of inspection 9/17/2013 Observations and Comments Seegage Instr. the valve was fully cycled. Fully cycled is considered the maximum that SCE can operate the gate within their permit limits. in case of an emergency, SCE can release approximately 850 out of the outlet. The outlet tunnel was not inspected during the inspection. The entrance to the tunnel was clean and no signs of leakage, cracking in the concrete tunnel walls or signs of deterioration. Vermilion Valley Dam was built on moraine soiis and glacial deposits and has a history of seepage at various locations of the toe of the dam and the seepage varies based on the reservoir elevation. At the time of the inspection, the reservoir was very low, significantly reducing the seepage values. There was no visible seepage on the slope of the dam, either of the abutments, or either groin of the dam. There was seepage noted at the nine monitoring iocations below the toe and the values recorded during the inspection are listed below: Reading Location (gpm) Threshold Levels (gpm) TD1 0* Dry WA West End Weir Dry 150 East End Weir 1.0 30 Weir 1.0 130 Weir 8+00 Lower Dry 170 Tunnel Weir 2 0.2 400 28+25 343 1300 Aux Drain 1 4.5 220 Aux Drain 2 22.7 170 TD1 was immeasurable due to a corroded bubbler. Did not measure during the inspection. All monitoring locations are equipped with 90? v?notch weirs except for weir 28+25 which as a 24- inch rectangular weir. The seepage at all of the weirs are considered normal and within historic limits. Instrumentation at this dam consists of 33 piezometers, 35 survey monuments, and 2 seepage weirs. The latest instrumentation submittal was submitted on April 26, 2013 and covers the 2012 calendar year. SCE submitted an abbreviated report that contains the long term seepage and settlement plots along with findings, field observations and inspection reports, instrumentation evaluations, and an engineering analysis. All observations, evaluations and analysis conclude that the dam is performing as designed. Piezometers: The piezometers are monitored when the reservoir is low and the frequency is increased to and then to weekly as the reservoir level increases. The data shows that Sheet 2 of 7' awn mb? ?zm x?w?u?w?gw mm Mamw?ZmL .ymy?wm 753m aw Ema {mama WEE. . .. .. . .33 ?magma mama amm??mcmg . . .me Sammy? memm?mawm mam. ?n?wm?mim . . .. . . . .. ?g Emma?m?? ?33% S. @329?. $.39 3Q. gnaw. jaw 5&me 53me ??33 mamm?im. 2% Emma magma mwbs?m mam ?gamm .3399. E35 Emmem?mwm?m ?53. Ema? gamma ?mama 3533?? (~ng Hummus? 3mm 3. 33mm mama? ?$th mam. mg? (25 3% mm WEE Ema m?m. 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SHE. mama. 3 9H :5 GENE-2.1251 {re-v. 10mg) 0 . .r Emma 8 w. veg?tat 21-? N: a? we oE'ma-m- WEE-Wilma: VeiEey Nan-E on and 'smsaEE TENN NAN EN Ewes need? Ea be rammed wi ?thin. 14/ . 23TEES eat 13:21; {(311 get: 28$.th 104% Sheet Ea .EE - V?gi?EaEE-mn?nd' Ea ENE rem-wad waEhEr-E' the e?gss? cf the: Tarzaghi Fain, 0f 1 ELEM agh?f drain- UP . CRLEFGRNUE MATERIEL $333333 3533-3333653- . OF QF KEARES REE: ERREREE EN Namenfi L'aam .Eeyi) am EGEEH-IES {Emmi-y Ream Tygje. cf Dam Ty-pa-?f?gi?wgy {3:339:71 (Shanna: Wake: E3 59:3 E33: 33:33:33: and 5383.13 3:31:33: 33:33:3- (23:33:. E?VeaEher (3033:3003 Sunny 3:33 {35? . cumm- 3:323:33. 33:33; REE: WEE: ?aEifmnEa ?33333: {8833;} 33:33:33.3- Em Fahd-3:: Enamdi?m E. The wives-E 33:31:33 ED 3:13:33 333332333333": 2. 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E3333 :38 :Eppear?d Er: {3:333 33:3 :31" 3:33:33; 5:035:33: TEE-.3: 31:33:: 3:5 the dam {Ema-3:33 '33 E33 Er: 9:33:33 Qan?iti?n as Wei! and" there was no evidems 33E an}: sewage ?E?hem wag- 33:33-33:33 33:33:33. 3:333:33. Eh: 3333:3333: TeE-?Eaaghi :3:-air: 2:33? grain: need 33:33:36. 33333 3:33.233 have: 33:33:33: hnwever a 33:33. :3:-33:33:33: pine 73:33:: rem-3E3: Therm E33333: reduce. the 3333;332:353 CE 3513:: drain if 33:33:33 EC: remain. was :3 rig in Eh: pram-ass huh-3:: E3: 3: the: TREE: wm?i: i3 3333:3333 Emmi-:3:: E3 3333' 3131.333 am: (33:33 requiEe 3:3: 33:: ?The pie: 33:33:: 33:3 ?being 3:3 33:33-33:33 E133 effedwmnaw we drains 33E 0: the dam. The rig was; ammu?ermg 33333333 :3 3:3E3x3m3te?: ?12. finch 3332:3333: and Ehar: enGaLEE-Eter?ng image: bouts: ars.- WES expzected SERGE: the 33:33 in stream bad. 33:39:33: 3: 3: :3 W33: E133 V38 N3 {Eats :33" Enspe?ion E2 Ear Date .03? RENEE 91233:; 23 3 333:: Shea: BEEN INSPECTION DANI AND RESERVOIR IN STATUS Name of Dam Vermilion Valley Dam Dam No. 104-23 Date of Inspection 8/9/201 2 Observations and Comments SDillway Seepage The approach, control section, and exit channel of the service spillway, located near the left abutment, were clear of any objectionable debris and in satisfactory condition. There is a- section of concrete in the invert of the service spillway that needs to be repaired; the section is located approximatel_ of the bridge over the midpoint of the service spillway. The approach, control section, and exit of the emergency spillway located at the right abutment, were clear of any objectionable debris and in satisfactory condition. The rip rap lining of the emergency spillway was in satisfactory condition. Th_ consists of - upstream - gate and a valve. During the inspection, the upstream - gate was open and the valve was open and releasing 430 into Mono Creek. Both the upstream gate and the valve need to be fully cycled. The outlet tunnel was inspected by walking the entire length of the tunnel. The tunnel was clean and no signs of leakage, cracking in the concrete tunnel walls or signs of deterioration. The low level outlets were not cycled during the inspection because of conflicts with the power generation demands of SCE and because it is a low water year. I made Mr. Pruchnik aware that this dam will be added to the list of dams that SCE wilt need to provide a plan and schedule as to when they are going to provide DSOD an opportunity to inspect and observe the gates being fully cycled. Vermilion Valley Dam was built on moraine soiis and glacial deposits and has a history of seepage at various locations of the toe of the dam and the seepage varies based on the reservoir elevation. There was no visible seepage on the slope of the dam, either of the abutments, or either groin of the dam. There was seepage noted at the nine monitoring locations below the toe and the values recorded during the inspection are listed beiow: Reading Location (gpm) Threshold Levels (gprn) 73.6 TBD 1.09 TBD West End Weir 13.4 150 Weir 8+00 28.5 130 Weir 8+00 Lower 17.7 170 38.7 400 28+25 700 1300 Aux Drain 20.1 220 Aux Drain 2 46.5 170 All monitoring locations are equipped with 90? v?notch weirs except for weir 28+25 which as a 24- inch rectangular weir. The seepage at ail of the weirs are considered normal and within historic limits. Sheet .2 of 3 INSPECTION Or" DAM AND RESERVOIR IN STATUS Name of Dam Vermilion Valley. Dam Dam No. 104-23 Date of Inspection 8/9/2012 Observations and Comments Instr. Instrumentation at this darn consists of 33 piezometers, 35 survey monuments, and 2 seepage weirs. The latest instrumentation submittal was submitted on May 7, 2012 and covers the 2011 calendar year. The owner (SCE) submitted an abbreviated report that contains the long term seepage and settlement plots along with findings, field observations and inspection reports, instrumentation evaluations, and an engineering analysis. Ali observations, evaluations and analysis conclude that the dam is performing as designed. Piezometers: The piezometers are monitored when the reservoir is low and the frequency is increased to and then to weekly as the reservoir level increases. The data shows that the piezometers generally respond to reservoir elevation with no increasing trends. Ail peak levels during the reporting period are within threshold levels. Settlement Monuments: The dam has 17 survey monuments that are typicaliy surveyed every five years. There were some monuments that exceeded threshold values in 2010. As a result, the dam was surveyed again in 2011 and confirmed that the dam has very little settlement or horizontal movement, confirming the 2005 survey. Monuments 4+00 and 1+20 U, were not surveyed in 2011. These monuments are scheduled to be surveyed in 2012 to verify the 2011 survey and to confirm that the dam is performing in a satisfactory manor. Seepage: Seepage is monitored at nine weirs and seven field pipe locations. Seepage is monitored when the reservoir is low and the frequency is increased to and then to weekly as the reservoir level increases. During the 2011 reporting period, all seepage readings were within threshold levels with the exception for weirs 8+00 and lower 8+00 weir. They exceeded their threshold levels by 110 and 49 respectfully. The seepage exceedances have occurred in the past when the reservoir had been filled in consecutive years. The last time this occurred was in 2005 and 2006. The instrumentation at this dam is judged satisfactory and no new instrumentation is judged necessary at this time. DWR 1261 (rev. 10/09) Sheet 3 0f 3