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V9993923. 22-22 9.9222293 32299 993.29 3 93399 239': 329.39 9932' 93232323399223. 29992733 9932222332 9239993: the? 2.29993 '93 3339 "339233, 2223239323 2-9 9322222933923 3232 99229393 3292': 9392339239 939223;; 33-29. 232993. 92-29 {3992239329992 3999 T329 93332299933, 9999 3993': 99223293 99933932. 9.22.23 99322992299222 9329332293 33:39:29 939:9: 92' 22229993232999 T339 139323399222: 2.32.99 3229239299 92-222 393993. {392292939 =93 323-9 9999 9339222293 2.99339. 9229 322329333 was in 9932939933232 9922223233922. 3323332322 999339 92.3 33-29 933.2399 99933 93233 93 2339 222293299222 32392 9.99 399339 2922292999 3233932999933; S9939 939229 33:29 339333 99332229329992 93292222932222.1922 21.229 39.33 22292339933192.3239 .9239 9392.39 9923329229 '92? 33:29 3223292": 9399 9329992993 229932922999 92333 9322 993' 32999 9 9939332 929323992 33-339 332329 but 9999 39. 122.9 322922339299 92223 293293.299 99 2229999233.. dime-9.92: 2229999299 232,2 A. 31329992239393": 393-29393; 393299? .3230 32939. 32:3 3229229923332 83222336 R9399 :33; for 02222229218993: 33939 223' 33.932932. 3322511333 .2 ?3 3-3.3 2222-2229-2992 29.92. 3332992 3332993 333' .. 7 Name of Dam INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Ice House Dam No. 1009 Date of Inspection 8/23/16 Observations and Comments Outlet Seepage Typical staining and wetness was present along the left wall vertical joints. The 1-inch weep drains along the left wall were ciear and were trickling. The two drain outfalls at the end of the channel were trickling by about 0.5 at the left and 1 at the right drains. Minor leakage under the close_ gates contributed to the wetness along the channel invert. The- gates were down and in the ctosed position, as allowed by the Certificate of Approval. The gates and operating mechanism, including the visible skin plates, anchors- arms, trunnions, and members; and the protective coating on the gates, were ail in good condition. The gates and valve were iast cycled in presence on 8/15/2013 with no problem. They were scheduled to be cycled during this inspection, but the operations crew did not show up due to miscommunication with Dam Safety Engineer. Nathan arranged for the gates and the valve to be fully cycled the following day and confirmed subsequently that the work was completed on 8/24/16. The controls should be cycled in our presence during the next inspection. The outlet was releasing 15.9 during this inspection, displaying its functionaiity. Main Dam We walked down the left groin to the toe and up the right groin. The face and left groin were dry, but the toe area was saturated with live flow below the access road as before. The 90-degree v?notch weir at the toe read 0.20 foot or 21 gpm. Seepage along the mid-right groin is channelized through a culvert and is captured by the toe weir mentioned above. The 90-degree v?notch weir high on the right groin was dry. The new seepage point about way down the left groin, noted during the 8/27/14 inspection, was damp this time. The historical seepage area along the left hiilside hear the toe and to the left of the outlet exit was wet and trickling as before. Seepage conditions were normal at the main dam. Auxiliary Dam - As noted earlier under ?important Observations?, an unusual seepage condition has developed at the toe area, as the unfiltered (crushed?rock) toe drain is believed to have partiaity clogged up and not able to capture all seepage. As a result, excess seepage is now daylighting at the toe and flowing In the past, oniy a patch of green grass and dampness existed at that location. Live flow was clear and estimated at about 3 gpm. The owner will submit a repair appiication along with a filing fee and supporting documents to start the review and approval process for a new toe drain. The face and groins were dry as before. We peeked inside the drain manhole at the toe and noted water pouring into the manhole at various spots. Seepage is collected at this manhole and is measured by a 90-degree v?notch weir abou_ across the road. The weir read 0.36 foot or 89 of clear water. This seepage is not unusual for this reservoir level. The highest reading taken by the owner this year was 154 gpm, which is within the historical range. I recommend instailing a larger weir as the high flows reach the top of the notch. Auxiliary Dike No seepage was noted on the face, groins, or toe of the dam. This low Dike is within the freeboard section of the dam. owa12e1 (rev. 10/09) Sheet 2 0f 7 Name of Dam INSPECTION bl; DAM AND RESERVOIR IN CERTIFIED STATUS Ice House Dam No. 1009 Date of Inspection 8/23/16 Observations and Comments Instr. Instrumentation at this dam consists of two seepage weirs and eleven survey monuments at the Main Dam, and one seepage weir and eleven survey monuments at the Auxiliary Dam. The latest instrumentation report was submitted by the January 29, 2016 letter, covering the 2015 calendar year Seepage Weirs The two Seepage weirs at the Main Dam are located at the toe and at the upper right groin area, and the one at the Auxiliary Darn is located of the toe. Main Dam Both weirs normally follow the reservoir fluctuations. The readings at the toe weir peaked at 61 gpm, and remained dry at the upper right groin weir in 2015. These readings are within the historical range. Auxiliary Darn - The toe weir readings followed the reservoir fluctuations as before and peaked at 66 in 2015, which are within the historical range. The high readings at the weirs are influenced by rainfall and snow melt. Survey monuments The survey monuments on the crest of the Main and Auxiliary Dams were last surveyed in 2014. By our letter of 11/24/14, we notified the owner that we had no objection to their proposal to change the survey frequency from annually to once every five years, provided a new survey is conducted following a major spill event or if there is a "felt? earthquake at the dams. The movements were reviewed in the previous inspection report and were found to be minimal. The available instrumentation data indicate the dam is performing satisfactorily (except for the unusual seepage conditions in 2016 at the auxiliary Dam, mentioned earlier). The current instrumentation network is adequate and no additional instrumentation is deemed necessary at this time. DWR 1261 (rev. 10/09) Sheet 3 Of 7 .5 w. . .3 Ea ?gs. mag 5&3 Em Eozm?o? Egm .mgm .?Ema 3. ?g ma.? 332303 mg. m5 Wm .mmamg. mm 3% 333% .mB mg. B. Em um? mug. Eek Emu .6 mm 3% SE. Emwbwa?ow ugh . . causmaw?. "5 mama mg m. 5.2 53 . m2. Ear. am xm?wzw??w .MQ WENEQWQN ?53? SN Name af- Barr?: FEB. HQHSE Uzi-m Nag "3 {399 {Fate cf insp?e?m 81.23313 . v. seepage: area, Backing; Cleft the: right an ge manh??a is. being waned by engine-er Gary Dams, 4. Fag-viking i?side the: Eee'page mamme, ShGWin-g Nata-2' eniering the i?arnime variants gamma. mm 126-1 {ram 1112091; Sihi?ei 5 Of f, 3% 22%. ,2 332mm ??cm 2% 3% 2m 2.m?w?m U?m 9h. ragga: xx . arid/wuux? ?.037 a, . ??le/x . J??i/I?mi?mm432/ .. "rum/av. .. W2 A .. .. my? ,U/zm, 7.2.. xx? .. xx 2 4., 7.210 :Iunnir??m. ,2 . . U. .. (W2, 230%me ?rm. wmwca?ma 2.3. 69.5% .me .203 new @308 V, a .I . (NW. mam $3 3.5 220$ m. QR 3mm; mm mm RES-ERWDER EN Name in? {Jam ME, Hanse- . . . 333m Na. Gate-0f zinspemien WQ?sk. -- - mix Seapage water ?aming Seeking upweam {award the meatim 0f tha manhaia behirsd tree; 8. The see-page waif Mama} about 100' feet dawns?aam aerosg {he waif, i- remit/31:11am ?insiai'izing a iarga?r wail? daring the-r Upmming repair pmjaci, as 393m? reaches mg? Km it)? {$753 weir during high ?awa {?539. mm)? Sheet_ STATE :33 CALIFQRMA NAT WA: REEOURLE AGE. .77: DEPAR i MEN: OF WATER E-ESQU-ECEE SAFETY DAMS ENE BARE ANS: E35 ETATUE ECE I I . .. Dan: No. I 1:389 I I I .CEurlin El Darade TypE :337i3am 7: REEK. 2" Earth Type of-Epi?way. weir gates and WEEHEI . ?.733 .. FEE: Epii-iWEy-Erssiand . 24.6 fee?tI' . :3Em ares-3:. WE: 3:433: End" miid . . . Mac-3:: SEWEFEE: End 6:337:37 3:32:73: EMBE- for 2:3:Epeetiosn Pa??dm 3:377:13. .: 3:73:31 33:73::7 WEE 3E TEE EEW EVEE Et73hE 3:333:53: grEisr: 31:36: Main. BEE: WEE: 33:31:; :h?E Eu: E4 2644' WE EECENEE QWEE: 3:3 thE 33:32:: annualiy E7: EVEN: EVE- yEarEI. prawdEE new candurted fEiEwmg 33:33:): 3:73:11: :37: if. thErE WEE E7 ?fElt? .3733: the if En Emu-E} summing prowam 37:33:33: FEE Ed. Emm the men End visual :hE Eam, Ere: judgec? for can?mad USE DEE: I WE waikad Eras: gram Em: 3:73:53 the M33333 Dam, Aux?mry Dam, and Auxi?a: 3: SEE. TEE Eamon waft-3:33am faces. and in .Ea?sfacmry 3337:: EE. E33333- Er distress. BEE-ic?ars :i'EsEp 0:7: Edi: 3 EHEE Mair: Dams: WEE m7: 3% 33:333. Dam. WETE Eiraighi. where by the 5:73:33: Ewing: Equipmem Emma: :33: did no: any Eig?i?cani?: mc?iERi Ec?vity EXCEE: the usuEi 3:71:36: - Aux?iiary Dar-37:7. Which EE -:3:m:ml?1E:3 by E?E?ii EiEng and Epimec-h, GQEE WEE whim: E3351 7:313:3bstru-EiEd. The: WEE and NEE: :23 WE EQEE. WEISS and invert- .WEE Er: EEtiEfEEtEry .minEr En 333:3 bridge; 3:337:33: E3: 3.13:3: $33.53.: End Eimzng the :7 ighi; ?30333: EtrEEm EhEnnEi WEI: :hE BEE. 3:33:35 and EiEn?g the mv-Er: whi-Eh :33:wa EmbiEm 7E: this time. but. EE- Emmtored End E73. WERE: Eiammg 33:72:: wetness. WEE WEE-EH: the left WEE joints. The 34:73:31.7: 33:33:33.5 EiEng the WEE: WEE End WEE inmimg, Eleii in: dEgrEE perhaps ?533.13 3:3 draught candiE-am. The. 333:: drain :gh-E E33317: EEC: :33" the dry. The-9:311:33 EEWR and. in: E33 EHEWEE by. thE :37? The. in ghee! The: Eschaiing En in . inspected by- . . A. GrEEubng II NE inspection .. WW5 WE 3. cam: .Ea:e=:3:7:7:epe:: DEE. 33:3": (RE: 1:33:33.) 1' 5 Elk-E- Name of Dam INSPECTION (Jr- DAM AND RESERVOER IN STATUS lce House Darn No. 1009 Date of Inspection 10/7/15 Observations and Comments Outlet Seepaqe The gates and valve were laSt cycied in presence on 8/15/2013 and by the owner on 8/6/15 with no reported problem. They are due to be cycled again next year in our presence. The ?Minimum Flow -Valves? were also exercised by the owner on 8/4/15 with no problem. The 10-inch fish release valves were open during this inspection and were releasing 5.4 cfs. and left groin were ry, 0e area was sa ura WI Ive ow ow access road as before. The SEQ-degree v-notch weir at the toe read 0.16 foot or 12 gpm. The right groin area was damp, but no live flow was noted. The 90-degree v?notch weir high on the right groin was dry. The new seepage point about 9A way down the left groin, noted during the 8/27/14 inspection, was not present this time. The historical seepage area along the left hillside near the toe and to the left of the outlet exit was wet and trickling as before. Seepage along the mid?right groin is channelized through a culvert (dripping by 3 to 5 gpm) and is captured by the toe weir mentioned above. These seepage conditions are normal for this reservoir level. Auxiliary Dam The face and grains were dry as before. Near the maximum section a patch of green grass and dampness was present as before. We peeked inside the manhole at the toe, where the drain outfalls daylight into. Seepage is collected at this manhole and is measured by a 90~degree v-notch weir abou_ across the road. The weir read 0.28 foot or 48 of clear water, which is normal. Vegetation in the ditch, leading up to the weir plate from the culvert was cieared satisfactorily, as requested during the previous inspection. Auxiliary Dike No seepage was noted on the face, groins, or toe of the dam. This low Dike is within the freeboard section of the dam. instrumentation at this dam consists of two seepage weirs and eleven survey monuments at the Main Dam, and one seepage weir and eleven survey monuments at the Auxiliary Dam. The latest instrumentation report was submitted by the January 29 2015 letter covering the 2014 calendar year. Seegage Weir The two Seepage weirs at the Main Dam are located at the toe and at the upper right groin area, and the one at the Auxiliary Dam is located of the toe. Main Dam? Both weirs followed the reservoir fluctuations as before. The toe weir readings fluctuated between 6 and 48 in 2014. The right groin weir fluctuated between zero and 48 in 2014 These readings are within the historicai range Auxiliary Dam The toe weir readings followed the reservoir fluctuations as before. The readings fluctuated between 18 and 154 in 2014, which are within the historical range. The high readings at the weirs are influenced by rainfall and snow melt. Survey monuments The survey monuments on the crest of the Main and Auxiliary Dams were last surveyed in 2014. By our letter of 11/24/14, we notified the owner that we had no objection to their proposal to change the survey frequency from annually to once every five years, provided a Sheet 2 Of 5 INSPECTION Oa- DAM AND RESERVGIR IN .ED STATUS Name of Dam 106 House Dam No. 1009 Date of inspection 10/7/15 Observations and Comments new survey is conducted following a major spill event or if there is a ?felt? earthquake at the dams. Main Darn The maximum horizontal movement between the last two surveys of 2013 and 2014 occurred at Monuments 10+00 and 12+00 (located near the midsection) for an upstream movement of 0.036 foot. These movements are a return to the previous readings. The maximum overall horizontal movement since 1961 (a period of 53 years) occurred at Monument 11+00 for a movement of 0.522 foot, which is considered minimal. The maximum vertical movement between the last two surveys of 2013 and 2014 was a settlement of 0.022 foot at Monument 7+00. The overall maximum vertical movement from 1961 to 2014 (a period of 53 years) occurred at Monument 12+00 near the maximum section for a settlement of 0.425 foot. These movements are considered minimal. The majority of the settlement occurred post construction between 1961 and 1986, and has been minimal since. Auxiliary Dam The maximum Northing and Easting since 1999 (a period of 15 years) have been movements of 0.015 (at Point 1 near the left end) and 0.016 foot (at Point 5 near midsection), which are minimal. The maximum vertical movement since 1999 (a period of 15 years) has also been minimal and occurred at Point 5 (near the maximum section) by a heaveof 0.006 foot. The available instrumentation data indicate the dam is performing satisfactorily. The current instrumentation network is adequate and no additional instrumentation is deemed necessary at this time. Sheet 3 Of 5 .5 My gown mmum? m5 Ema .Emm?cgom wagon? agagw mg .m . SEE ?gar 1.. . u. 3 ma?a aa? 5% 38 as. w??w ?Magma $mech Ema. .6 .mem2 QQ Em QZQ QQ am as I A IN IFICIR-NIA Ass assass A A Am CIFWATER A A AA AA OF SAFETY DAMS QERITIFIEILI SIRIUS Isa Haas-s- Rams-swam Dam 1.330.; I039- El? [3301!?31250 of? 233m I and?sz? sausay agas GaIas I 39 I f'ss't' 33-96 fast II II WasII'Ier' Commons sass; amt-sags Mass Shams Baas-Isak, ass {Isa-Isy with SAMMIE IAI- Inspzeaisn Rabuai IssbsisIIaI-I Rssamm'sags?aas s?r Itsms Iba swsar?b aIIerII-an: I Ramavs saga?tatian IssaIrIq as Is Ihs swans-Imam Isa weir stats 2' an": saw sI. swsI gram sf Isa 8am. Dam saws); tiaIa Ia? A, not InsIudsd IaIss?I as The (Isis .I?I?am 2913 and 23% aways. awna'r Ia fag; ISA and sa?arm Issaings Is sham Ihasa Isadings are rapsIIs-CI. This sands-Ian Is assasIabIs. wiser-Aisha Its. bs sI'ssery- sac-I addressed In Cabana-Isms Pram-the- Assam: and dam. and afa- ass; {Isms . -Tba arssI embankment ram-bibs Is 'ArsI and Is satisfastary' Candi-son. {30:11 IAas-s of aasI?I slam dIssIAIsd as signs sf Instability a? .IIa-.Isp Isa-as ramsin sIsbIa and VagsIaIIsn a'I sash dam was gaad. Rassa I 0} Is an Dam. amass-Imam ages. was sasIIsIA, and. dawnsIr-sam asnaraIa shame} wars sIa-ar and Ws AArs-II-Iad-Ibs aban'naI {ram Isa sans!? CambIsIadansta?IIan? ramsA-Ia-I ssd' asasrsta apaII Is-aaIIs {Iris shamsI Iwa wsisks {Is this The was; was sampiatad saIIsIaaIsI ably sussmaIaI Was Ihs channsi I'hs Isft waI Is vertical joints, and aIanIg sacaans InvaII staining; was alsa absawsd aIaI?Ig the Ist wan vertical Wasp. mains,- ?st waII as a. sIssI Asa Raspaga shame-I I'ha gates wars assays-II In Isa CIGSEII as Is :aII-swsa pa" of This gsfas be In good ssh-dissa- asaIIsgs wars Agassi A OrasI-Ibzgsa? IS 3?;Ib?gk?? PhaIssIakes? Is wk New 'Daiaofinapsc?an- II .. Asa sass ansIfBaaI bats. 1251;; . RSI (Rev. $hes?f- (If I. 5. '5 DAM AND RESERVOIR EN STATUS Name of Dam ice House Dam No. 1009 Date of Inspection 8/27/2014 Observations and Comments The gates and valve were last fully cycled in presence on 8/15/2013, with no reported problems. SMUD reportedly last fully cycled the gates and valve on Main Dam: No seepage was observed on the face of the dam. A new seepage point approximately three quarters the way down the left groin was observed. The area was approximately-in diameter and wet with live flows less than 1/2 gpm. The area may have previously been masked by vegetation; however, this is unknown. SMUD will monitor the condition closely. The historical seepage along the left hillside observed near the toe and left of the outlet outfall was wet with tricking flows. This condition is considered normal. Seepage was audibiy heard and observed along the right groin. Seepage along the mid-right groin is channelized through a culvert, released along the lower right groin, and measured at the toe weir. The toe was damp with green grasses observed. Any live flows along the toe are also measured at the toe weir. The following seepage readings were taken during this inspection: Toe Weir 0.2? (20.6 gpm) Upper Right Groin Weir dry (standing water in weir box) SMUD needs to monitor the new seepage condition described along the left groin. Ali other seepage conditions are considered normal. Auxiliary Dam: No seepage was observed on the face or groins. Near the maximum section of the dam conditions along the toe were soft and damp with green grasses observed. This is a normal condition at the dam. Embankment seepage is measured at a 90? v?notch seepage weir approximatel_ of the toe across a service road. The following reading was taken at the weir: Auxiliary Dam Weir 0.28? (~47.5 gpm) Flows from the weir were ciear. didrequest the vegetation leading up to the weir plate from the culvert be cleared. Seepage conditions were considered normal. Auxiliary Dike: No seepage was observed. The dike is within the freeboard section of the dam. Spillway Channel: The end of the spillway channei is equipped with two drain outfalls. The left drain was dry and the right drain was flowing approximately 1 gpm. Staining and dampness was observed along the left wall vertical joints. Weep-drains along the left drain were trickling flows. Minimal leakage was also observed through the- gate seals. These conditions are considered Outlet 8/6/2014. Seepage normal. Instr. instrumentation consists of survey monuments and seepage weirs at both the Main and Auxiliary Dams. The latest instrumentation report was submitted to us with an owner?s letter on January 29, 2014, for calendar year 2013. 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'3 51-351 '3 {5.3133333 D3333) 3933:? ?3153: 32333333333333.3333: Date 33? 32-35333?: .9353 23?? :3 3133 3:33? 3:333:3- 323'3 (33:3: 33:03:: 81333333 1 3:3" 5 INSPECTION br- DAM AND RESERVOIR iN CERTIHED STATUS Name of Dam Ice House DamNo. 1009 Date of Inspection 8/14-15/2013 Observations and Comments Seepage Instr. controls and all appurtenances appeared to be in good condition. Main Dam: No seepage was observed on the face or left groin of the dam. The lower right groin was damp with no live flow observed. The toe, right of the outiet control house, was saturated. Seepage flows at the toe are collected and measured at a V?notch 90? seepage weir. The weir read 0.16? (~12 gpm) during this inspection. The upper right groin 90? v? notch seepage weir was dry. These seepage conditions are considered normai. Live seepage flow was also identified left of the outlet control house, near the toe of the dam, emanating from the abutment hillside. Flows were estimated to be approximately 1 gpm. This seepage is not believed to be related to the darn. Auxiliary Dam: No seepage was observed on the face or groins of the dam. The toe was partially damp. Seepage at the dam is measured at a 90? v-notch weir approximately 100? of the toe, across the service road. The weir read 028? (~47.5 gpm). These seepage conditions are considered normal. Ms. Roach reported during the inspection that SMUD employees have recentiy observed signs of decomposed granite in the weir box. SMUD believes the decomposed granite is likely from the service road and unrelated to the dam. Flows were observed at the toe manhoie and at the outfall into the weir box during this inspection. All flows were clear. SMUD should continue to closely monitor the situation. - Auxiliary Dike: No seepage was observed on the face, groins, or toe of the dam. These conditions are normal. Spillway channel: The left spillway drain pipe at the bottom of the channel was observed to be flowing at ~2-3 gpm. The right drain was flowing approximately 1 gpm. The weep drains along the left spillway wall had an observed trickle. These conditions are consistent with past inspection reports. Instrumentation at this dam consists of 11 survey monuments and 2 seepage weirs at the Main Dam, and 11 survey monuments and 1 seepage weir at the Auxiliary Dam. The most recent instrumentation report dated January 28, 2013, covers data through calendar year 2012. Seepage Weirs: Seepage weir readings are recorded and began in 1993. Peak seepage readings this past year recorded the following values: Main Dam toe weir 145.9 gpm, Main Dam upper right weir 56.4 gpm, and Auxiliary Darn toe weir 181 gpm. The Main Darn toe and Auxiliary Dam toe weir readings had abnormaiiy high peak readings the last two years. The owner attributes the high readings to heavy rain; however, also states that the weir readings are inconclusive since they are only read 1 agree with this assessment and the next instrumentation report needs provide a solution so that a conclusive evaluation of weir data can be provided, particularly for readings that exceed action or historic maximum vatues. Possible solutions include discontinuing weir readings in the months when they are impacted by snowmelt and rainfali, more frequent readings in dry months, correlating rainfall and weir data on time?plots, etc. Survey Monuments: The survey monuments on both the Main and Auxiliary Dams are surveyed annualiy for horizontal and vertical control. Survey data dates back to 1961 at the Main Dam and 1999 at the Auxiliary-Dam. The latest survey was performed in 2012. 1 Sheet 2 of 5 INSPECTION bl- DAM AND RESERVOIR IN STATUS Name of Dam Ice House Dam No. 1009 a Date of Inspection 8/14-15/2013 Observations and Comments . Main Dam: Vertical movements have been minimal this last year_ Since 1961, the maximum settlement is observed at Monument 12+00, located near the maximum section of the dam, of approximatel_ Since 1986, settlement data has been relatively stable, <0.05? feet. Horizontal movement has been relatively stable since 1961, with exception of a slight observed at monuments 10+00, and 13+00 all located near the maximum section of the dam. The greatest movementis observed at Monument 11+00 of approximatel_ The year to year movements have been less the- These movements are considered minimal. Auxiliary Dam: The horizOntal and vertical movement have been minimal over the last year and since surveys began in 1999. Settlement data has remained withir? Horizontal data has remained withir_ These movements are considered minimal. The current instrumentation network at this dam is judged to be adequate, and no additional instrumentation is deemed necessary at this time. 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Arrangements need to be made to fully cycle all outlet controls during the next maintenance inspection. Main Dam: The face and left groin of the dam were dry. There was dampness along the lower right groin, but no live flow. The right groin 90? v?notch weir was dry. The toe of the dam was saturated with live flow below the access road, as usual. The 90? v?notch weir at the toe read or 15 gpm. These seepage conditions are normal. - Auxiliary Dam: The face, groins, and toe of the auxiliary dam were dry. Seepage is measured at a point approximately 100 feet of the dam, across the service road. The 90? v?notch weir at the toe reao?, or ~56 gpm. TheSe seepage conditions are normal. The auxiliary dike was not inspected on this date due to time constraints. Instrumentation at this dam consists of eleven sUrvey monuments and two seepage weirs at the main dam, and eleven survey monuments and one seepage weir at the auxiliary dam. The most recent instrumentation report was received by DSOD on January 30, 2012 and includes data through December 2011. My review of the data is as follows: Survey Monuments: The survey menuments on the main and auxiliary dams are surveyed annually for the horizontal and vertical components. The monuments were last surveyed on 7/18/2011. The 2011 survey at the main dam shows that the maximum horizontal movement since the initial sUrvey in 1961 wa_ in the direction at Station 11+00. The greatest recorded horizontal movement since the previous survey in 2010 wa_in the direction at Station 14+00. The main dam survey also shows that the maximum vertical movement since the initiai survey in 1961 was a settlement 0- at Station 12+00. The greatest verticai movement since the previous survey in 2010 was a heave 0? at Station 5+00. These movements are considered minimal. The 2011 survey at the auxiliary dam shows that the maximum northing movement since the initial survey in 1999 wa_ in the direction at Point 3. The greatest recorded northing movement since the previous survey in 2010 wa_ in the upstream direction at Point 6. The maximum easting movement since the initial survey in 1999 wa_in the direction at Point 3. The greatest recorded easting movement since the previous survey in 2010 wa_ in the direction at Points 1 2. The maximum vertical movement since the initial survey in 1999 was a heave 01? at Point 3. The greatest vertical movement since the previous survey in 2010 wa_ at several different points. These movements are considered minimal. Seepage Weirs: The Dam Toe weir at the main dam peaked at 61.2 in 2011, well below the 120 threshold value recommended by independent Part 12D consultants in 2008. Seepage at this weir continues to change with the reservoir elevation. The maximum historical flow for this weir was 181 in 1998. The Upper Right Groin weir at the main dam peaked at 56.4 in 2011. The recommended threshold value is 90 gpm. Maximum historical flow at this weir was 95 in 2005. Sheet 2 of 3 OF DAM AND RESERVOIR IN C?n STATUS Name of Dam ice House Dam No. 1009 Date of inspection 9/25/2012 Observations and Comments The Auxiliary Dam Toe weir peaked at 108.2 in 2011. it continues to mirror changes in the reservoir elevation, as expected. The recommended threshold value for this weir is 185 gpm. Maximum historical flow forthis weir was 181 in 2009. The available instrumentation data indicates that the dam continues to perform satisfactorily. Because of the high seepage readings at the main and auxiliary dams last year, the owner should continue monitoring seepage flows closely. The current instrumentation network at this dam is judged to be adequate, and no additional instrumentation is deemed necessary at this time. DWR1261 (rev. 10/09) Sheet 3 of 3