52222-222272: {32: CA2. cemeew? sabecn: {2.2mm Ail-F WATER Rf; ES GF OF RAMS .ENSPECTEQR BARE AME RESERVQE-R AN. STATUS Meme Fierebbe Lake 23am Dam 2222:. 2282243282 some 23222222232222 Tyee of $2222.22: f?v?fui?g?e Are}: T232923. bf'Spiwaey $322265 Weir? I .. I I Weter'igs 15.3 fee? Aeiew 529232222232 meet-end I I 228:3 feet 5'9wa 22232:: Wee?hu Lenti?ceme ?123222222222 32222: {222 (322222222022: 2222:2222: 8322mm befev: Bet: B?bwrz e226} A: $222223 ease! 222233222: Sebiher-r: (RC-E) Reaaen {er tnspeeiibn Peribc?e Memteneme Weber: 223.222 Emee?ebt e22 Taken {2222' 22222 222222222 {Aegeei {2.2922222 . 2.: 222: 22222222222222: e222,: be {3.22:222e2e2ee {2:2 {Re 22222;: 23:2?2 2822?. Renews-?bee $222222: {he {been 2:2:222222:e:2b22 e222: i22epec{22222:, {222.22 {2122222222, endme 22.2222: eefie {2:222 bee :22e212i22bt32e33e22222 . 222.: R222: eLmei {system {22.22222 {32222222222222.2223 .Qem Lake Elem {29252222 {SR-erehee. Arch: 22 22:2 {aceted {Ri?e left ebu22ne222 Abe'Arbh .58 2:22. meted 22-22 222232 2222222222 ebetment The. dam E-Eeeg 222222: the meet . dbu?e'iee are walkway 2"{32 :3 Ipbee'e The dam: Greet wee ibe'psebted end wee Teena: to be Ievei. {me {.22 ee?efebieq: {sandman The: 222222. 2:22:22: ee?ibb ef the upstream be?iee {22' the den: fene- Wee e222: Rees ebewed. masked 2:22:22 Spa?ed ehbterete {:22 the face bf the eem. 8825. 22: 2.2: 2.22222: {.222r 22: {32:22:32 ?ne-2 {3.22 the ebeireem 2222222322232. arches ?22 I {breeze}: 222:: 2:22.: 22.82: {2'2 {22:22:22 eep2'ieetizbn, Red. {2222 A2222: 2.2222122 end {2222 2322132218, 22:22.4. . The ?ewi 22222222 222222222}: is 'tb. be bemeieted by the e222: 2222 2822 The deems-{mam 2:22:22:- efihe arches appearej {e be '22: setiefaefbry sendi?bn with 222.22- exbeb?er: ef- e22 Ie222<22?22222g epeii {:22 {he dbwnefreem bf Arch I522. Thjie {Is damage {2232223222122 22.: be ebee?ed. The 22:22::3 {evei bee: the 2A: veers: A2222 the pert: 23:22:): 23.2'2e2'2 en the {:eetreem ei?cie 22222::- heieec? reduce the three-g}: the $222222. Evidenee 0f {meter seeping vie eeie?ze 3.2: '22: {2222:2232 2222:2222;- hbwever. {:22 2:222:22 2:222:22 erbhee were 2322:: c2222.: {be {Ase-2:22:32 {22:22:23 drew: dawn. The centers: be2wee22 the ere-hes- 22222.2 the-fbuede?bn agape-e2" 22:: be .222 eefisfeetb-{y {22:2222'22'2en. The 25:22 22.222233 22gb: appear 22:: 22232212: 22222:? 2222222222 222:2 ei'gbe {32" {estabi?en N23 evidence {12? {2222222222 activity was present durieg: like Vegetation centrbi being meme-222.222: 5Q Ii2iie2ey I The 22:32 12:22:13: .222: Fiereebe Dem 222 3 2222mm 2:32-25: getee' Weir {mete-2:2 between Amhee 38 end'i? The age: ?21::er 22.222: 2222212 {2222:2222 {22222222 {222222 12:2:- were 222- {be {5:222:22 pee??bb {22222.2 {222 {he 222222 52:22:22: 2e22e?. The 2223;220:2322, {2.2222222 gatee, censrete {22222222. and eeljwey e222: wee: deer bf any (Selene. 2223;223:4232! 22s. A- {1222:2222 22? I P'f?e?eemkeb? Yes: Nb I Detebf inspection 52.323.272.01? . cafe: I .- Date efRepm ewe {tee-1 22:22:. 22212222: She-{2% {3f INSPECTION DAM AND RESERVOER IN TIED STATUS Name of Dam Florence Lake Dam Darn No. 104-09 Date of inspection 5/23/2017 Observations and Comments Outlet Seegage Florence Lake Dam outlet consists of two gates which are located in - Looking the left is cracked open proving a fish release to the South Fork of the San Joaquin River. The is frozen in the closed position. The was not cycled during this inspection as it was fully cycled during the May 10, 2016 inspection. The - valve at the end of the outlet pipe that supplies the minimum release was also not cycled for the same reasons. SCE is planning the replacement of the vaives along with the completion of Phase 1 of the geomembrane instaliation by the end of 2017. Water is conveyed to Huntington Lake for power generation through the 13.5?mile Ward Tunnel which could be used to drawdown the reservoir in an emergency. A few arches had standing water where drainage was not provided. All of the floWs from the seepage weirs and seepage measuring points were normal and no unusual or elevated flows were observed. Measurements taken during the inspection were as follows: Leakage Inspection Readings Peak 2016 Threshold Level Area (gpm) Readings (gpm) (gpm) Frog Pond Wet 58-7 50 Ridge Dry 94-2 100 River Wet 16-5 15 Arch 47 A Wet 11.5 11 Arch 49 A 1.5 8.6 10 Arch 50 8.2 26.9 5 Arch 53 Needs to be recalibrated 25-5 20 Arch 53 9.8 15-4 13 - Arch 55 8.23 15.4 28 Arch 56 13.4 31-6 26 The instrumentation for this dam consists of 11 seepage weirs. Three are located in three areas of the dam designated at the ?Frog Pond", the ?Ridge", and the "River Section", and eight 90? V?notch weirs were installed in 2008 and are located in or near Arches 47, 49, 50, 53, 55, and 56. The iatest instrumentation submittal was dated May, 2017 and covers the instrumentation data of the 2016 calendar year. Several seepage weirs exceeded the threshold levels during the 2016 year. Arch 50 exceeded threshold levels due to an instrument malfunction and has since been repaired. The other weirs that exceeded their threshold levels can be attributed to the readings taken earlier in the year when the reservoir was at its highest level and was kept essentially full for approximately two months. This most likely resulted in higher seepage rates instead of the reservoir being full for only a short time of a few weeks. Weir 49 was reactivated in 2013 but due to the drought conditions, the Ridge area threshold Sheet 2 of 5 ELMM Mama mung-mange. . . . HQ. 04479 mat-ea m" imp-section $213201?? a-gicurremiy was. mt :cons-ide'r addii-?ana? i'aakaga i?t?hig Weir Whid?h mntribated i=0 a?Imasi ha?" of tha iota-i :aeapage far the": Rama area Thm?mfx? vaiu? wi?? asses adjuated after a {gm-r years 1:030:13th ihe a?d?it?fanaj kmkage 433E The data prmzidesci' ind-maxim {113% the; dam is: in: a Swish-Star}; manner. Ni? :insii'umas??iatiun jiudga?g? mixes-sai?yi 233: this. time. 311.52. anti. the: mani?wing freeman-c136 apgzxear is: be sufi'i?iem this; time. BWR 12:34. (rev. @9399} Shee?i 3 Ca? Elm 2.1.1; 1 $9.2 .93 2% age. #53" 42Kym? ma ENNWNE .E 3.?me waswmw .02.?gingham m?h?kw aw?? 7mm mm?u??wwmm mz?m ma?a NEW i OF -- CA3. 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A N0 E3333 0.3. 133333333333 ET I I cc for 0333333 83.33% 3:33.333 :33 3333:3333 53253253 5 33333 3.333 3333.. 32333333 I 33333- '3 of 5 0:3? 3' 33+; - 33.33 3 M330 OF DAM AND RESERVOIR IN CEKTEFIED STATUS Name of Dam Florence Lake Dam Dam No. 104?09 Date of Inspection 5/10/2016 Observations and Comments Outlet Seepage Instr. Florence Lake Dam outlet consists of tw gates which are located in - Looking the left valve is cracked open proving a fish release to the South Fork of the San Joaquin River. The valve is frozen in the closed position. The leijllve was fully cycled during this inspection. The --valve was not cycled. The alve at the end of the outlet pipe that supplies the minimum release was also fully cycled without issue. SCE is planning the replacement of the valves along with the completion of Phase 1 of the geomembrane installation by the end of 2017?. Water is conveyed to Huntington Lake for power generation through the 13.5-mile Ward Tunnel which could be used to drawdown the reservoir in an emergency. A few arches had standing water where drainage was not provided. All of the flows from the seepage weirs and seepage measuring points were normal and no unusual or eievated flows were observed. No measurements could be taken during the inspection because all of the leakage monitoring areas had been winterized and could not provide readings. The instrumentation for this dam consist of 11 seepage weirs which are located in three areas of the dam designated at the ?Frog Pond?, the ?Ridge", and the ?River Section?. Seven 90" V?notch weirs were installed in 2008 and are located in or near Arches 47, 49, 50, 53, 55, and 56. The latest instrumentation submittal was received on May 21, 2015 and covers the instrumentation data of the 2014 calendar year. The reservoir was not fully filled in 2014 and so many of the seepage locations showed seepage well below the threshold and action levels. 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. The instrumentation data provided indicates that the dam is performing in a satisfactory manner. No additional instrumentation is judged necessary at this time. The existing instrumentation and the monitoring frequency appear to be sufficient at this time. Sheet 2 of 6 mm.? mg @sz ?a mw?g?mw gig 233m .r?wm. Qmw? . .3me 20, . 0me 1m. \m . magma. /x.,Wx vax? Em ?muggm? mm Em. 6mg.? mama ?w?mmwom as $933me 31mm. u?m SE ?@919me . a. mm mg Em ?a Egg 53m is? 323% rug 5mg Ea. 20. ?Exam Ema mmguwmmoxaa m: 9N3 u. r: 5.: @303 gorge E.mi.?m. 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MP 30 '85er SETEVI I30: Eeasm a: 830' 310:3 II 00 IEO Nam {:34 and II TIIE E000 I23 I30 EI 8300' 030 I00 {3388?s AII 330m ass?f?ied with the: 333032: 00 0:3. and 0r: I, dam i333 3333 000E 0I0EEII NI 3330038043 with IE0 300308800, I30 3 E00 a00r0-300 81:8!2813, II) 03m ?30,500 has been 010EI3II 00f 8.. V108: .00 the ?ner (00:30:? and I0 be: Spar II- :24 . . . and VIELIEI dam, and 83,0 Ere EEIE f0? use; pan-ding repairs I130 33333-03 - .E-EII 93m DEE): I3 0 E8 arches, 380%); I I3 810- 108 AMI). 58 I0 The 03:33 Is 3E0 IE0 crest 8008533 33 II Imam-0800 Th0 dam crest was 300?" was I0 be M308 3853000, and 00n-diti0r3. The: I3 {3 0.00800 830 upgtream 00r8033 Clam, fag-I3 WEE and showed 3:33 EE0II. 00 the I300 . IEO 00m Thar? was magma arches 4184.42, E2848, 488914., 3005 458483 These mack-II are I0 I30 00009 the: 0f IW-he geamemhrane SIZE I3 the 'acmg a {3.333% ?ner :33 I330 upaIrEam T236533 Ihmugh '23 as I338 a @3333 0n, 00 June? 3- 282? 4 and 0n 2:313; 18 2.814 I3 P533301 Excamia?z 01?? 3E 303%.! denMerI-Em A vary Emaii water Is ELI-I 0f IE3 $03800 Ere?33 dawn This i3) 03035307 by damage from IEO spaiIed area I0 33333 3?32?} the NEE-age and 050000; area and 0f the IEO Arc-I3. has: ram-00:3. 0?5 VIE I00 Is In athE 0053 b? The and I0 I3E 3002 I30 . E10 0f 3.033in was during the {328% 01300033 CE f0: Gh?mg?g?ak DEIE Repm 2528'! 5 OWE-1281 {Re-v1. 70169.}- - ?heEI 1 0f - ,7 IL I: DAM AND RESERVOIR IN CERT (ED STATUS Name of Dam Florence Lake Dam Dam No_ 104-09 Date of Inspection 9/16/2015 Observations and Comments Spillway Outlet maintained. The spillway at Florence Dam is a_ long gated weir located between Arches 36 and 37. The spillway has two drum gates which were in the down position due to the low lake level. The approach, drum gates, concrete weir, and spillway exit were clear of any debris. SCE stated that there appears to be seepage coming from the access shaft in the center pier of the spillway that allows access to outlet vaives for the drum gates. No additional or increased seepage has been observed or reported. - Florence Lake Dam outlet consists of two gates which are located in - Looking the let valve is cracked open proving a fish release to the South Fork of the San Joaquin River. Th valve is frozen in the closed position. Neither of the - valves was exercised during this inepection. SCE is planning the repair or replacement of the valves along with Phase 2 of the geomembrane installation in 2016. there is an - pipe that supplies air to the valves to prevent the outlet pipes from collapsing ifthe outlet is opened to the full open position. This -pipe is full of water due to the configuration of the outlet system. According to DSOD files, the outlet controls have not been operated in DSOD presence for at least 10 years. Water is conveyed to Huntington Lake for power generation through the 13.5-mile Ward Tunnel which could be used to drawdown the reservoir in an emergency. Sheet 2 of 7 Name of Darn Florence Lake Dam AND RESERVOIR IN CERT Dam No. 104-09 STATUS Observations and Comments Seepage A few arches had standing water where drainage was not provided. All of he flows from the seepage weirs and seepage measuring points were normal and no unusua. observed. Measurements taken during the inspection were as follows: Leakage Inspection Readings Threshold Level Area (glam) (atom) Frog Pond Dry 50 Ridge Dry 100 River Dry 15 Arch 47 A Dry Not spilling 11 Arch 49 A Dry 10 Arch 49 Dry NA Arch 50 Dry Not spilling 5 Arch 53 Dry? Not spilling 20 Arch 53 Dry Not Spilling 13 Arch 55 Dry 28 Arch 56 Dry 26 Instr The instrumentation for this dam consist of 11 seepage weirs which are located in three areas of DWR 1261 (rev. 10/09) Date of inspection 9/16/2015 Seepage Measurements: Leakage 2014 Peak Readings Threshold Level Area (3pm) (3pm) Frog Pond 13.2 50 Ridge 5.9 15 Sheet or elevated flows were the dam designated at the ?Frog Pond?, the ?Ridge?, and the ?River Section". Seven 90? V?notch weirs were installed in 2008 and are located in or near Arches 47, 49, 50, 53, 55, and 56. The latest instrumentation submittal was received on May 21, 2015 and covers the instrumentation data of the 2014 calendar year. The reservoir was not fully filled in 2014 and so many of the seepage locations showed seepage weli below the threshold and action levels. 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Carpi construction crews were using some of the filled arches as staging areas for materials. The spillway at Florence Dam is a_ long gated weir located between Arches 36 and 37. The spillway has two drum gates which were in the down position due to the low lake level. The approach, drum gates, concrete weir, and spillway exit were clear of any debris. SCE stated that there appears to be seepage coming from the access shaft in the center pier of the spillway that allows access to outlet valves for the drum gates. No additional or increased seepage has been observed or reported. Florence Lake Dam outlet consists of tw gates which are located in - Looking the left is cracked open proving a fish release to the South Fork of the San Joaquin River. The valve is frozen in the closed position. Neither of the - valves was exercised during this inspection. SCE is planning the repair or replacement of the valves along with Phase 2 of the geomembrane installation in 2015. pipe that supplies air to the valves to prevent the outlet pipes from collapsing if the outlet is opened to the full open position. pipe is full of water due to the configuration of the outlet system. According to DSOD files, the outlet controls have not been operated in DSOD presence for at least 10 years. Water is conveyed to Huntington Lake for power generation through the 13.5-mile Ward Tunnel which could be used to drawdown the reservoir in an emergency. DWR1261(rev.10109) Sheet 2 of 7 Name of Dam Florence Lake Dam INSPECTION Car DAM AND RESERVOIR iN STATUS Dam No. 104-09 8/27/2014 Date of Inspection Observations and Comments Seepage A few arches had standing water where drainage was not provided. All of the flows from the seepage weirs and seepage measuring points were normal and no unusual or elevated flows were observed. Measurements taken during the inspection were as follows: Threshold Levei DWR 1261 (rev. 10/09) Leakage Inspection Readings Area (spml (gem) Frog Pond Dry 50 Ridge Dry 100 River Dry 15 Arch 47 A Dry - Not spilling 11 Arch 49 A Dry 10 Arch 49 Dry NA Arch 50 8 Dry Not spilling 5 Arch 53 Dry Not spilling 20 Arch 53 Dry Not Spilling 13 Arch 55 Dry 28 Arch 56 Dry 26 The instrumentation for this dam consist of 11 seepage weirs which are located in three areas of the dam designated at the ?Frog Pond", the ?Ridge?, and the ?River Section?. Seven 90? V?notch weirs were installed in 2008 and are located in or near Arches 47the weirs except for weir arch 508 follow the reservoir level. The latest instrumentation submittal was received on April 10, 2014 and covers the instrumentation data of the 2013 calendar year. The reservoir was not fully filled in 2013 and so many of the seepage locations showed seepage well below the threshold and action ieveis except for the Frog Pond and the River Section. 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. Seepage weir Arch 498 was reactivated during the reporting period and on June 18, 2014, the weir read 4.6 gpm. Threshold values for weir Arch 498 will be established in the next few years after more data has been collected. The Frog Section and River Section exceeded the threshoid seepage levels and will be monitored more closely in the future. No specific reason for the increase in seepage was identified. A geomembrane liner (Carpi liner) is to be installed in these arches to reduce seepage as part of Phase 2. Sheet 3 of 7 {?99 $4394 $54 9E3 Mama-0f Dam. gamma Laka {Siam N0 '3 59398-6? insghaeiim :81?253?720 Ubwwai?imm 99:92:23 ?'gmm-anis: - Saw-999 99999991999999.9999: $934999 I 3421?; $1939 Reg?i?g?l 199999 4993 {333m} - 3 igpm} 99990-99. 59a 59' wage. 3.324 Riva? HRS 1.5- 9999 99' .. :9 Arch :99 10 Amt-z, .99 a 9.9 NA. Arch S- Arc?h .53 (I - .1594 .253 Amh?am .26: Arch 355 1.5.4 '28 Arch 5-59 . :26 Th9 instrumgntatim dam previtied' indicates- ihai ?31.93 dam is: pet'rfenrmihg in a sa?sfamtmy mama. Na insimmama?m is; j-ucigaci necessary at this The: exiwng imimm?nm?m and the mm?m?ing frequency am?ezar t9 be sum-dam at {hi-:9 time-r 3 tha ?i Making-32114149 onsitruc?on asiivity. {awa- 9-99. 2992-9} {Sheet m4w cf QAM RESERVWR ik?has?? 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Wuii'f 3:35 95039813833533? {3333503 3135;333:533 93?? 8520133 {?53 Own-erii?awk Dede {345' 9.3253? 3 {3333 {2'33- {33333 {333333 Sheet; 1 {33' 8. inspecrion DAM AND RESERVQIR so STATUS Name of Dam Florence Lake Dam Dam No. 104-09 Date of inspection 9/18/2013 Observations and Comments Sgillway Seegage The spillway at Florence Dam is a_ long gated weir located between Arches 36 and 37. The spillway has two drum gates which were in the down position due to the low lake level. The approach, drum gates, concrete weir, and spillway exit were clear of any debris. Repair of the- outfall channei? was completed by pouring concrete training walls and installing a pipe. SCE stated that there appears to be seepage coming from the access shaft in the center pier of the spillway that allows access to outlet valves for the drum gates. Calcite buildup was apparent. i asked that they monitor the seepage and check for any new cracking or spelling to which they agreed. Florence Lake Dam outlet consists of tw gates which are located ir_ Looking the left valve is cracked open proving a fish release to the South Fork of the San Joaquin River. The right -valve is frozen in the closed position. Neither of the- valves was exercised during this inspection. SCE is planning the repair or replacement of the valves as part of the long term repair plan. In - there is ar- pipe that supplies air to the valves to prevent the outlet pipes from collapsing if the outlet is opened to the full open position. This pipe is full of water due to the configuration of the outlet system. The broker- valve on the pipe has been repaired and photos were sent to DSOD per request. According to DSOD files, the outlet controls have not been operated in DSOD presence for at least 10 years. Water is conveyed to Huntington Lake through the 13.5-mile Ward Tunnel and could be used to drawdown the reservoir in an emergency. Seepage was observed in the horizontal lift lines in the deeper arches but appear to be minimal due to the low reservoir level. A few arches had standing water where drainage was not provided. All of the flows from the seepage weirs and seepage measuring points were normal and no unusual or elevated flows were observed. Measurements taken during the inspection were as follows: Leakage inspection Readings Threshold Level Area (am) (am) Frog Pond Did not measure 50 Ridge Did not measure 100 River Did not measure 15 Arch 47 A Dry - Not spilling 11 Arch 49 A . Dry 10 Arch 50 [3 Dry Not spilling 5 Arch 53 Dry Not spilling 2O Arch 53 Dry? Not Spilling 13 Arch 55 Dry 28 Arch 56 Dry 26 The instrumentation for this dam consist of 10 seepage weirs which are located in three areas of the darn designated at the ?Frog Pond", the ?Ridge?, and the ?River Section?. Seven 90? V?notch Sheet 2 of 8 0AM AND RESERVOIR IN CL . l'i- iD STATUS Name of Dam Florence Lake Dam Dam No. 104?09 Date of Inspection 9/18/2013 Observations and Comments weirs were installed in 2008 and are located in or near Arches 47the weirs except for weir arch SOB toilet the reservoir level. The latest instrumentation submittai was submitted on April 26, 2013 and covers the instrumentation data of the 2012 calendar year. The reservoir was not fully filled in 2012 and so many of the seepage locations showed seepage well below the threshold and action levels. SCE submitted an abbreviated report that contains the tong 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. Seepage Measurements: Leakage 2012 Peak Readings Threshold Level Area (3pm) Frog Pond 16.4 50 Ridge 0.4 100 River 2.0 15 Arch 47 A 9.5 11 Arch 49 A 3.2 10 Arch 50 0.1 5 Arch 53 13.0 20 Arch 53 8.9 13 Arch 55 8.2 28 Arch 56 13.0 26 The instrumentation data provided indicates that the dam is performing in a satisfactory manner. No additional instrumentation is judged necessary at this time. The existing instrumentation and the monitoring frequency appear to be sufficient at this time. Sheet 3 of 8 a, ?aw? ?yam? m? mum wwpm?m VIM Zm3an Zn?. Pam . is mammaw. . .f cl - ?18.;an Mf?am Ng- {late of ins lemon . . 33.x a rapzaizred, 125? {ram "3 {1.1.09} we 39m.? 53 a? $3 WNW. w. mm. @33me ?my. mam. magi93. wwa?ai #53335sz QM, ,Jwvm?iw? ZWH xm??mwmh% ma?a (I L. ., L??am?e of {Siam Dam. Dam N0. ?13.4439 Dam-of hugger-Liar: . 852013 DWR (LL-L. Lama; Sth'sei?i: .. {If 8_ i mm saw-:3 ZEN . 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The: 5511155511 drum 551155, 131311511515 111151151113 51111'111'15315111111151'5 5161511? 51.1131 {155115.1'251111115 11111-1111 1111111111111 1111111111111? \l g- *1 1115115111511 1111 155.11 1 P1111105 1511.511?- Y55 ?mm? 1351.11 02" 1115551111511 8151315320112 cc. 1131' QWHEMBGQ-K 0.515 (11' 95551-1 515511151 2 Y3K 13111111. 125.1 {11511. 11310911 Smelt ?f Name of Dam Florence Lake Dam Observations and Cemments Outlet Seepage 3 U) 3?1- 5 DWR 1261 (rev. 10/09) Ca. DAM AND RESERVOIR IN GER-fin EED STATUS [Dam No. 104?09 8/8/2012 Date of inspection Florence Lake Dam outlet consists of two utlet gates which are located is cracked open proving a fish reiease to the South Fork of the San Joaquin River. The alve is frozen in the closed position. in- Looking the left Neither of the 3- valves was exercised during this inspection. SCE is planning the repair or replacement of the valves as part ofthe long term repair plan and it is scheduled for 2013. pipe that supplies air to the valves to prevent the outlet pipes from collapsing if the outlet is opened to the fuli open position. This pipe is full of due to the configuration of the outlet system. There is a alve in the pipe that has either broken or completely failed causing the valve connection to leak severely. SCE staff has tied the pipe to some temporary anchors and has begun the process to draw the reservoir down to help reduce the pressure and the leakage through this valve connection. The plan is to replace the -valve when the reservoir elevation is reduced to approximately 10?tbs of pressure. SCE plans to accomplish the replacement of th- valve by mid-October, 2012. According to DSOD files, the outlet controls have not been operated in DSOD presence for at least 10 years. Water is conveyed to Huntington Lake through the 13.5?miie Ward Tunnel and coutd be used to drawdown the reservoir in an emergency. Seepage was observed in the horizontal lift lines in the deeper arches but appear to be minimal due to the low reservoir level. A few arches had standing water Where drainage was not provided. All of the flows from the seepage weirs and seepage measuring points were normal and no unusual or elevated flows were observed. Measurements taken during the inspection were as follows: Leakage inspection Readings Threshold Level Area (gpml (3pm) Frog Pond Did not measure 50 Ridge Did not measure 100 River Did not measure 15 Arch 47 A 1.45 11 Arch 49 A 1.32 10 Arch 50 5 Arch 53 2.73 20 Arch 53 0.17 13 Arch 55 0.36 28 Arch 56 0.36 26 The instrumentation for this dam consist of 10 seepage weirs which are located in three areas of the dam designated at the ?Frog Pond?, the ?Ridge", and the ?River Section?. Seven 90" V?notch weirs were installed in 2008 and are located in or near Arches 47the weirs except for weir arch 50B follow the reservoir level. The iatest instrumentation submittal was submitted on May 11, 2012 and covers the instrumentation data of the 2011 calendar year. Only Sheet 2 of 7 INSPECTION DAM AND RESERVOIR IN CERTI. STATUS Name of Dam Florence Lake Dam Dam No. 104-09 Date of Inspection 8/8/2012 Observations and Comments leakage weir 53D appears to have exceeded the threshold level and is most likely an error in the instrumentation report. The owner (SC submitted an abbreviated re ort that contains the lo. term seepage and settlement plots along with findings, field observations and inspection reports, instrumentation evaluations, and an engineering analysis. All observations, evaluations and analysis conctude that the dam is performing as designed. Seepage Measurements: The readings for the ?Frog Pond?, the ?Ridge?, and the ?River Section? are as follows: Leakage 2011 Peak Readings Threshold Level Area (em) (3me Frog Pond 24.27 50 Ridge 42.32 100 River 10.45 15 Arch 47 A 9.48 11 Arch 49 A 4.88 10 Arch 50 0.18 5 Arch 53 17.1 20 Arch 53 16.3 13 Arch 55 19 28 Arch 56 23 26 The instrumentation data provided indicates that the dam is performing in a satisfactory manner. No additional instrumentation is judged necessary at this time. The existing instrumentation and the monitoring frequency appear to be sufficient at this time. Sheet 3 of 7 Emwm?img m, Ea gm 6me mg?w gnaw, 3.3. mmomem $3 $3 73.. 4:3an Umww ?mvm?as ..M .m v.23 $.me $ch .mrmi a? .N 1261 ?re-w. 'ilif?g) Name ai'Dam Lakze- in Eater) 0% M: 3m Ci'iicm mm Am. {mm Dam No; 10?09