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Sheet '3 of 6' INSPECTION OF DAM AND RESERVOIR lN CERTIFIED STATUS Name of Dam Shaver Lake Dam Dam No. 104-18 Date of inspection 9/15/2015 Observations and Comments Outlet Seepage Instr. The low level outlet for Shaver Dam consists ofa valve was not cycled during this inspection due to severe drought conditions. Mr. Safavl stated that they are working through turbidity issues that have arisen in the past by fully cycling th valve. Mr. Safavi will notify DSOD regarding the plan to fully cycle the_ valve. The vaive needs to be fully cycled during the next inspection (last operated in DSOD presence in 2011). There was a release of approximately 5.7 into the streambed. The housing appeared to be in satisfactory condition. Most seepage has stopped aside from very minor seepage from the Carpi liner drainage ports and some minor foundation seepage that is measured as it daylights near the outlet structure. No seepage was observed on the face of the dam. During the inspection, the North Liner Drain was measured at 006 gpm, the Middle Liner Drain was measured at 026 gpm, and the South Liner Drain was measured at 0.05 gpm. These volumes are considered to be minimal and not of concern. . The instrumentation for this dam consist of 7 survey monuments, 6 seepage weirs, 6 seepage points, 29 piezometers, and selected testing of the 141 foundation drain holes with a pressure gauge (packer). The latest instrumentation submittal was submitted on May 21, 2015 and covers the instrumentation data of the 2014 calendar year. SCE submitted an abbreviated report that Contains the long term seepage and settlement plots along with findings, field observations and inepection reports, instrumentation evaluations, and an engineering analysis. All observations, evaluations and analysis conclude that the dam is performing as designed. Survey Monuments: The movement from the survey of the seven crest monuments show very minor movements and were less than th-threshold level. The trend of most of the monuments shows slight movement upstream due to the lowering of the reservoir. The next survey is scheduled for 2015. Seepage Measurements: The instrumentation report provided seepage plots from 2005 through 2014. Weir 9+3? peak reading of 17.7 exceeded the interim threshold levels of 13 gm for the reporting period. There has been no set trend identified at this point. Peak seepage values were less than one half of the 2011 peak readings. LP-2 through did not exceed threshold levels. The peak readings for Weir 10+40 of 15.5 exceeded the interim threshold value of 4 gpm. This large exceedence is due to backwatering if the drain is plugged showing providing a seepage value far greater than actual leakage being monitored. The need for drain line cleaning has been identified and SCE has scheduled the work. The peak readings from the seepage weirs are in the following table: Sheet 2 of 6 OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Shaver Lake Dam Dam No, 104?18 Date of inspection 9/15/2015 Observations and Comments 2014 Peak Interim Threshold Interim Action Weir Reading (gpm) Value (gpm) Vaiue (gpm) 9+3? 17.7 13.0 NA 10-5-40 15.5 4.0 NA LP-2 0.03 2.0 NA 0.4 4.0 NA LP-4 0.0 0.5 NA LPThe 2014 peak readings for the North, Central, and South Liner Drains were 0.7, 3.7, and 2.5 respectively. The South Liner Drain exceeded the current interim threshold level by 0.5 gpm. There is no evidence of any liner performance issues and no set trend has been identified. Interim threshold values are to be reevaluated in 2016. PiezometerlUplift Pressure Measurement: The piezometer instrumentation data and plots were included in the latest data report. Piezometers 5+89, 6+92, 7+12, 11+22, 11+44, and show response to reservoir elevation. Piezometers 4+20, 10+500, 11+92, and 12+11 show a variable response with respect to iarge reservoir drawdown. Piezometers 7+43, 7+500, 7+79,, 8+30, 9+30, 10+46, and 13+49 show variations between readings but do not respond to reservoir elevation. All the piezometers except and show hydrostatic pressure below the action level. SCE performed a stability analysis on block 21 at the iocation of piezometers and SCE has determined that there'is no concern for uplift pressures measured. The instrumentation data provided indicates that the dam is performing in a satisfactory manner. No additional instrumentation is judged necessary at this time. DWR1261(rev.10109) Sheet 3 of 6 Egg; wmg?mm 3.5% I 2&de ?093 .mummdm? @de Zn. 4 ma?a mummw Q. Ewmw??s. mama m? A. 2 22/ .15%:me 3%me ?mm 6.2 ma?am? "mm ma?a. .3 man my? mma?mgwagm .42" 22' . 2; . rye? 9.45 . . .- 2 322% 2 .227. . .. $39.5 $.0ng E. m5 goinmwam? New. gm. 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ERR N41 Date-11111351313131.1111: SEEIQQM (313' 1131f 011151185] 8091*. I {3511'le Rapa? 91319121314 I 13111111121111.1111.1111119? 11-1" ENSPECTEON OF DAM AND RESERVQIR lN STATUS Name of Dam Shaver Lake Dam Dam No. 104-481 Date of Inspection 8/ 26/ 20 1 4 Observations and Comments Outlet Seepage Instr. The low level outlet for Shaver Dam consists of a valve was not fully cycled during this inspection but cracked instead, showing it works. This exception to crack the valve and not do a full cycling of the valve is due to the extreme drought and low water years. The_ valve needs to be fully cycled during the next inspection (iast operated in DSOD presence in 2011). There was a release of approximately 6.5 into the streambed. The housing appeared to be in satisfactory condition. Most seepage has stopped aside from very minor seepage from the Carpi liner drainage ports and some minor foundation seepage that is measured as it daylights near the outlet structure. No seepage was observed on the face of the dam. During the inspection, the total seepage amount from the South, Center, and North Liner Drains was not measured during this inspection but appeared to be similar to the inspection in 2013. This volume is considered to be minimal and not of concern. The instrumentation for this darn consist of 7 survey monuments, 6 seepage weirs, 6 seepage points, 29 piezometers, and selected testing of the 141 foundation drain holes with a pressure gauge (packer). The latest instrumentation submittal was submitted on April 10, 2014 and covers the instrumentation data of 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. Ali observations, evaluations and analysis conclude that the dam is performing as designed. Survey Monuments: The movement from the survey of the seven crest monuments show very minor movements and were less than the?threshold level. The trend of most of the monuments shows slight movement upstream due to the lowering of the reservoir. The next survey is scheduled for 2015. Seepage Measurements: The instrumentation report provided seepage plots from 2004 through 2013. Weir 9+37 exceeded the interim threshold levels for the reporting period. SCE believes that more data is required to aid in identifying any new trends since the geomembrane liner was installed. Seepage values were still well below 2011 readings. through LP-6 did not exceed threshold levels. The peak readings from the seepage weirs are in the following table: 2013 Peak Interim Threshold Interim Action Weir Reading (gpm) Value (gpm) Value (gpm) 9+37 20.1 13.0 NA 10+40 2.8 4.0 NA LPHZ 0.6 2.0 NA LP-3 1.3 4.0 NA LPLP-6 3.5 2.5 NA Sheet 2 of 5 ERR RREERTEE ERR ETRWREE {Rama {Ram Shaver {Ram REG, 9f ERIESKRQER ERR-RR REFEREE: NEVER, and were RR, 8.6! 53pm The REE-ERR Em WERE 28%. REFER Exams . . 52-031.. ERR-3 Ems?; Ra?-a rep-am PER-Ezm?aiem 5&9, TREE, '3 REE-E REE-RR, 23m: sham REVERE-REE RGRSOE, R588. and, Sh?w a respect Ea-rge EEasa-nmir ERRERGER, ERREEOE, RERQBGE be?wan REBCREERQE REE.) RIO- ?(Ease pEa-mma?tem Except REE-59A and ERR-R5085 hydra-3mm pressure- beimw the ascEE-m Eaves. SSE pa-rfanmeci a arEaEyRE-s an Ezsiack 21 0E piemma?em? and SCE- E'Eas. Es. Em? press?ums The previdad EhaE {has dam- is p-arformmg REE a RaEE-Rfa?m?y REE-amen No E3 judged mcessafy' at. this: (- mas-1 Eye-Er. 16-3119} Shae?: 3 mw?i' {ram "i {1389Name 32'- Diam Shamr Lame ?133 {kin! 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TSS Spiilway WSSI 1211' S1111 S131S1111S11SS1S T171111 11111111111111): 111 1111111 1111119131111111 111111111111111 f. imparted by .A WUETT 111111111? YES 3T NO 133111. Sf En'spectin'n 16152913 I 1.113.111: 311103: I Date STIR-11131111 II 21"? 9/231 3 111111112611111111. 1011:1111. Sheet "1 1:11- 5 INSPECTION OF DAM AND RESERVGIR IN CERTIFIED STATUS Name of Dam Shaver Lake Dam Dam No. 104-18 Date of Inspection 9/16/2013 Observations and Comments Outiet Seegage Instr. The low levei outlet for Shaver Dam consists of a valve was not cycled during this inspection but needs to be fully cycled during the next inspection (last operated in DSOD in 2011). There was a release of approximately 125-128 into the streambed. The housing appeared to be in satisfactory condition. All seepage has stopped aside from very minor seepage from the Carpi liner drainage ports. No seepage was observed on the face of the dam. During the inspection, the total seepage amount from the South, Center, and North Liner Drains was 8.23 gpm, which is considered to be minimal and not of concern. - The instrumentation for this darn consist of 7 survey monuments, 6 seepage weirs, 6 seepage points, 29 piezometers, and selected testing of the 141 foundation drain holes with a pressure gauge (packer). The latest instrumentation submittal was submitted on April 26, 2013 and covers the instrumentation data of 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. Survey Monuments: The movement from the survey of the seven crest monuments show very minor movements and were less than th-threshoid level. The trend of most of the monuments shows slight movement upstream due to the lowering of the reservoir. The next survey is scheduled for 2015. Seepage Measurements: The instrumentation report provided seepage plots from 2003 through 2012. through did not exceed threshold levels. LP-1 is the only leakage point that does not respond to reservoir level. measured leakage even though the reservoir was completely drained during the installation of the Carpi Liner. SCE plans to discontinue reading in 2013. The peak readings from the seepage weirs are in the following table: 2012 Peak Interim Threshoid Weir Reading (gpm) Value (gpm) 9+37 11.55 13.0 10+40 3.02 4.0 5.51 1.60 2.0 LP-3 3.39 4.0 0.00 0.5 LP-5 0.95 1.5 LP-6 1.92 2.5 The differences from the values measured during the inspection and the values that had been recorded in the instrumentation report were drastically different due to the installation of the Carpi liner. 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The spiliway consists of a-notch in the concrete parapet wall on the upstream side of the crest located in the center of the dam. The spiilway was clear of any objectionable debris. The concrete appeared to be in satisfactory condition. The tow level outlet for Shaver Darn consists of alve was not cycled during this inspection due to conflicts with power generation and because it is a low water year. There was a small fish release of unknown amount into the streambed. The housin_ was being repaired and so the _house was not inSpected. Inside the galleries, collection pipes were used to drain the upward vertical drains to direct the flows into the drainage troughs on the side of the adit. AII seepage has stopped aside from very minor seepage from the Carpi liner drainage ports. No seepage was observed on the face of the dam. During the inspection, the seepage values were as follows: Seepage Point Flow (gpm) 0.5 LP-2 Dry Dry LP-4 Dry Dry LP-6 Dry South Liner Drain 0.71 North Liner Drain 0.22 LP-1 is the highest seepage point and is does not respond to reservoir elevation and the flow is from the adjacent hillside. This seepage measurement is scheduled to be discontinued in 2013 since it does not measure flow from Shaver Lake Dam. The instrumentation for this dam consist of 7' survey monuments, 6 seepage weirs, 6 seepage points, 29 piezometers, and selected testing of the 141 foundation drain holes with a pressure gauge (packer). The iatest instrumentation submittal was submitted on May 11, 2012 and covers the instrumentation data of the 2011 calendar year. The owner (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. Survey Monuments: The movement from the survey of the seven crest monuments show very minor movements and were less than the?threshold Ievei. The trend of most of the monuments shows slight movement upstream due to the lowering of the reservoir. The next survey is scheduled for 2015. Seepage Measurements: The instrumentation report provided seepage plots from 2002 through Sheet 2 of 7 L. DAM AND RESERVOIR IN CERTL .ED STATUS Name of Dam Shaver Lake Dam Darn No. 104?18 Date of inspection 8/6/2012 Observations and Comments 2011. The leakage points and LP-6 exceeded theirthreshold levels by 0.46 and 0.77 respectively. increased seepage later in the year was attributed to a second consecutive year of above average snow pack. through did not exceed threshold levels. The peak readings from the seepage weirs are in the following table: 2011 Peak Threshold Weir Reading (gpm) Value (gpm) 9+37 65 70 10+40 10.76 10 5.22 8 LP-2 2.33 3 LP-3 8 9 LP-4 0.85 1 3.46 3 LP-6 4.77 The differences from the values measured during the inspection and the values that had been recorded in the instrumentation report were drastically different due to the installation of the Carpi liner as well as the lack of precipitation in early 2012. PiezometerlUplift Pressure Measurement: The piezometer instrumentation data and plots were included in the latest data report. They include piezometers in four sections of the dam where there are foundation drains; Sta. 4+00, Sta. 5+00, Sta. 10+00, and Sta. 12+04. The readings will be recorded and threshold levels set in 2013 to monitor the uplift pressures. All piezometer data, measured pressures below the uplift pressures assumed in SCE analysis. 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