STATE oE CALIFORNIA . CALIFORNIA NATURAL RESOURCES AGENCY . DEPARTMENT OF WATER RESOURCES - I .. DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Darn Castaic Dem Ne. 1-58 County Los Angeles Type of Darn Earth Type of Spillway Concrete Weir and Open Channel Water is 12.8 feet below spillway crest and 32. 8 feet below dam crest. Weather Conditions Cool and Cloudy Contacts Made D. Panec, O. Virgadamo. A. Haddox. V. Morenes, J. Salazar. J. Quintero, M. Kellog, H. Eshraghi Reason for Inspection Periodic Maintenance inspection lm ortant Observations Recommendations or Actions Taken Numerous wall panels along the right side of the spillway are showing signs of concerning rotation. Large voids are detected underthe upstream spillway slabs. Some of the illwa underdrains are blocked and should be Cleared. The two?Valve-were fully cycled during this inspection. 18 new piezometers have been installed in the left abutment area. This work was associated with the alteration application filed on December 14. 2016 and approved on December 30. 2016. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use, pending analysis of the stability at the left abutment. Observations and Comments Da_m The asphalt road on the crest was well aligned, level, and in good condition. The soil cement lined upstream slope was in satisfactory condition with no signs of distress or instability. The rip-rap slope was uniform and normal. Vegetation control was excellent. There were some old scattered rodent holes, but rodent control appeared satisfactory even though the bait stations were empty. The offset in alignment to the curb in the left abutment parking lot remains unchanged, still measuring approximately 1.5 inches. The stability of the left abutment is being evaluated. An exploration plan consisted of drilling 18 boreholes and installing 18 new piezometers was just completed and associated with the alteration application filed on December 14, 2015 and approved on December 30, 2016. The exploration plan is part of the seismic stability re-evaluation of Castaic Dam focusing on the rising pore pressures in the left abutment. Sgillway The approach. open Channel, and exit to the spillway were open and Clear. The invert slabs are exhibiting uplift caused by subgrade heave. The most significant uplift has occurred to the panels closest to the upstream end. There are sections where the subgrade is visible through the joints because the slabs have heaved so much. Large voids are detected under the upstream spillway slabs, and have noticeably increased since my previous inspection 5 years ago. Additional right spillway wall panels are showing rotation. Offsets have increased to 3 inches at the top of some of the right wall panels. The movements of the right wall panels are similar to the conditions that led to the wall panel failure that previously occurred at this spillway and to the spillway walls across the lake at Elderberry Forebay. Inspected by J09 Photos taken? Yes No Date of inspection 04? 7/2017?7 A on for Owner/Book Date of Report 04/23/2017 14? DWR1261 (Rev. torus) Sheet 1 of TR) $234 7 INSPECTION OF DAM AND RESERVOIR IN STATUS Name of Dam Castaic Dam No. 1-58 Date of inspection 04/17/2017 Observations and Comments The?was traversed and found to be relatively dry and in satisfactory condition. Several underdrains appeared plugged and need to be cleared. Most of the drains are misaligned, but serviceable. The owner should begin a plan to address the above noted spillway issues. Outlet The outlet tower and access bridge appeared stable and in satisfactory condition. The outlet- was inspected and found to be fairly dry and in good condition. Plastic is draped over the epoxy coated penstock pipelines to further protect it from corrosion. Numerous pipe support bolts and nuts were heavily corroded. A special inspection to the penstock is scheduled to be performed shortly to evaluate and mitigate the corrosion issues. The owner is currently investigating the retrofit options due to seismic deficiencies for the tower and outlet system. The two? valves (Valves 1 2) were fully cycled 100% during this inspection with no difficulties encountered. Valve 2 had an oil leak that should be fixed. The- Th -valves were last operated in our presence during the Jul 11, 2016 and August 25, 2015 inspections, respectively. The corrosion to the on the stream release bypass line has been addressed and the valve has been reinstalled. The-valve immediately of the?valve has been removed and refurbished. The valve is currently at the William Wayne Powerplant waiting to be coated. Seegage There were no signs of seepage located on the slope, groins, or toe of the dam. The weir readings were measured with the following flows: Weir Height Flow 0.06? 1.0 729? 293 008? 2.0 Dry Flows were normal for the reservoir level and flowing clear. Current instrumentation for this dam consists of 12 hydraulic piezometers, 33 open standpipe piezometers (18 just installed), 25 pneumatic piezometers, 11 vibrating wire piezometers, 16 observation wells, 16 spillway drill holes that measure pore pressures (discontinued July 2009), 4 seepage locations, 14 slope indicators, 14 dam crest monuments, 22 upstream slope monuments, 18 slope monuments, 6 monuments (1 got destroyed in 2003) in the left abutment, 360 illwa wall pins, and 128 spillway chute pins. Also, there are 2 accelerographs? hmonitored during seismic events. The latest instrumentation report was transmitted on May 26, 2016 containing data through December 31, 2015 and was reviewed in the July 11, 2016 inspection report. Sheet 2 of 6 INSPECTION OF DAM AND RESERVOIR STATUS Name of Dam Castaic Dam No. 1~58 Date of Inspection 04/17/2017 Observations and Comments Besides the rising pore pressures in the left abutment, there were no concerning trends or conditions noted. is working with Design Branch to review the left abutment stability and 18 new piezometers have just been Enstalled in the left abutment area. The instrumentation for this dam is judged adequate and no additional instrumentation is required at this time. Sheet 3 of 6 INSPECTION OF DAM AND RESERVOIR IN STATUS Name of Dam Castaic Dam No. 1-53 Date of inspection 041179017 Leaking upstream the epillway channel. Upheaval of the invert slabs is noticeable. Heave to the invert ie more prominent at the upstream area. Sheet 4 of INSPECTION OF DAM AND RESERVOIR IN STATUS Name of Dam Castaic Dam No. 1-58 Date of Inspection 04/17/2017 DWR 1261 (rev. 10309) Sheet i of INSPECTION OF DAM AND RESERVOIR IN STATUS Name ofDam ?astaiq Dam No. Date of Inspection 04H 7/2017 DWR 1261 (rev. 10109} STATE OF CALIFORNIA CALIFORNIA NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS ll INSPECTION OF DAM AND RESERVOIR IN CERTIFIED i? i il.?.u i Name of Darn Castaic Dam No. County LOS Angeles Type of Dam _Earth Type of Spillway Concrete WEiLal'ld Open Channel Water is . 33.9 feet below spiliway crest and 53.9 feet below darn crest. ewe - Elevation 1481.1' Weather Conditions Sunny and clear Contacts Made ?es below Reason for Inspection Periodic Maintenance Inspection Important Observations. Recommendations or Actions Taken None. Conclusions From the known information and visual inspection, the dam, reservoir. and the appurtenances are judged safe for continued use. Observations and Comments Da_m The dam crest was walked and found to be level and well aligned. The visible portion of the upstream soil?cemented upstream slope showed no signs of instability. The rock covered slope also showed no visible signs of instability or distress. The left abutment showed no observable changes from past inspections. Vegetation control appeared satisfactory. While no rodent activity was observed, the pellet feeders used for rodent abatement were found empty (as has been noted during previous inspections)- The groins and toe were normal and dry. Sgillway The approach, spiliway channel, and exit were clear (material that has accumulated in the Castaic Lagoon of the spillway exit is unlikely to impede any flood flows). The concrete comprising the ages weir, wall panels, and invert panels appeared to be in satisfactory condition with no changes noted from previous inspections. Outlet The outlet tower and access brid a eared to be in satisfactory condition. The _gate, no so open position not operated during the inspection; All of the tower valves were in the closed position. The Division of Operations and Maintenance is continuing to review the tower's seismic stability and possible remediation options. The concrete compromising them vault was generally found to be in good condition. The following table Iis vs ves a need to be operated were operated in 0800's presence: Date In DSDD Presence 25 15 3/ 25/ 15 8/ 251' 15 nuns The?valve was cycled to 50% open and then closed during the inspection; Mr. Quintero noted that the valve had some gearing issues and there was a grinding noise while the gate was being cycled. Repairs to the valve operator should be implemented as soon as possible. Inspected by Shawn Jones Photos taken? Yes No Date of inspection 71 6 so for OwnerrBook Date of Report 917? 6 DWR1261 (Rev. mics) Sheet of 5 INSPECTION DAM AND RESERVOIR IN STATUS Name ofDam Gestalt: Dam No. 1-58 Observations and Comments The_ valve on the ?pipeline has been removed and a Seegage Contacts Date of Inspection. replacement valve is expected to be installed in February 2017; the?pipeline have to be dewatered to before ?the new valve installed. Also. the?valve has been replaced (Photo 7). There were no signs of seepage observed on the slope. at the toe. or along the groins. Toe seepage measure at the vault was dry and seepage for the outlet drain was measured to be ~1 gpm. The lower than normal seepage readings are likely due to low winter precipitation and low reservoir elevations. Instrumentation at this dam currently consists of 12 hydraulic piezometers. 15 open standpipe piezometers, 25 gas piezometers. 11 vibrating wire piezometers. 16 observation wells. 4 seepage points. 14 slope indicators. and 326 survey points. Reservoir water surface elevation. rainfall. and seismic accelerations are also monitored at the dam. The most recent instrumentation data submittal is dated May 2016 and covered the period up through December 31. 2015. Piezometers and observation wells continue to show a reasonable phreatic surface through the embankmentffoundation and that the internal drains are performing as designed. Many of these instruments located at the dam's left abutment showed response (decreasing pore pressures) to the reservoir being lowered over a 1.5 year long period. indicating a correlation between readings from these instrUments and the reservoir; 0&M's is currently working with Design Branch as part of a review the left abutment's stability (it is expected that new instrumentation may be installed as part of this work) in response to rising pore pressures observed in the left abutment. Seepage readings during this reporting period have been lower than average. and for the last part of the reporting period toe seepage has been dry. due to the low reservoir elevation and low precipitation. No concerning flows or trends are observed in the seepage data provided. One survey was performed in April 2015 during this instrumentation submittal period. Data plots of the survey data shows little change from previous survey and no new/developing trends noted. The also shows that the crest settlement has not exceeded the design freeboard; at the dam?s maximum section?The data continues to show the embankment and appurtenant structures follow past trends at a very slow rate. No detrimental trends (slide ?lanesi are observed bi the slope indicators located within the darn embankment. Inclinometers some movements? but. the observed movements are small @135") and no recent progression of movement is observed. With exception to instrumentation used to monitor pore pressures at the left abutment. the current instrumentation and monitoring frequency is judge adequate at this time. Arthur Reis (FERC). Bonnie Duecker. Joseph Salazar. Victoria Valentine. Joel Quintero. Willie Castillo. Jaime De Santiago. Mike Barrera. Joseph Cruz. Shawn Holloway. David Panes. Amber Haddox. Richard Sandoval. Eduardo Trejo. Vanesa Morones. and Curtis Green (DWR). own12s1 {rev.10lC 9) Sheet 2 of 6 INSPECTION Cn- DAM AND RESERVOIR IN CERTII IED STATUS Name ofDam Castaic Dam No. 1-58 Date of Inspection 7711/fink. I. de* lu?i? ?In? 1.4- -.-- . I- RWY I . . Photo 2? Looking Iowards the left abutment along the dam ore-st. (rev. 10109} Sheet i 01' i INSPECTION Dr DAM AND RESERVOIR IN CERTII STATUS NameofDam Castaio Darn No. 1-53 Date of Inspection 7H 1/16 a ?ct - My 911? Iff?f '?ir g?fi .qJ Iii. 1 Photo 3? :?Outlet tower and access bridge. 13.11 lg??ylliig:19 Photo 4 Spillway approach was clear of debris. owrt1251 (rev.10f09) Sheet 0" INSPECTION 0r DAM AND RESERVOIR IN CERTI: STATUS Name of Dem Casteic Darn No. 1-58 Date of Inspection 7/11/16 Photos 5 Offset between spillway wall panels at Station 113+00 appeared unchanged from past inspections. DWR 1261 (rev. 10(09) Sheet 5 of 5 INSPECTION hr DAM AND RESERVOIR IN CERTI: STATUS Name 0! Dam l'iflastail: Dam No. ~58 Date ofinspection. DWR 1261 (rev. 10309} STATE oF . . CALIFORNIA NATURAL RESOURCES AGENCY . .. DEPARTMENT OF WATER RESOURCES - DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Darn Darn No. 58 County LDEEI?gelee Type of Dam Earth Type of SpillWay Concrete Well and Open Channel Water is 115 7 _feet below spillway crest and 135 feet below darn crest. vas? EITev?ationi?oo Weather Windy clear. egg hgt; Contacts Made Jaime De Santiago Joel Q_LI.I_r_itero David Panec Amber Orloff I\Iic George,? and others. Reason to Inspection F?eri_od_ic Maintenance Inspection I Special Inspegtiorl of _t_he _upstream__ Face Important Observations Recommendations or Actions Taken 1. Rehabilitation of the_ vaIVes at the high intake water has been completed. 2. A low oxygen reading was measured at the grate on top of the toe seepage vault. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use. _C)_bservations and C._omments The dam crest was level well aligned and In good condition. As was during the previous inspection the reservoir water surface elevation was very low. The upstream soil- cemented slope was walked and found to be in very good condition and with no signs of instability noted. The rock covered slope was also found to be in satisfactory condition with no visible signs of instability or distress. The left abutment was walked with no observable changes noted from previous inspections. Vegetation and rodent control appeared satisfactory; however, pellet feeders used for rodent abatement were found empty. The Division of Operations and Maintenance?s (OBIIVI) stability review of the dam's left abutment is currently on hold. Spillway The approach. spillway channel. and exit were clear. There were no observable changes to the spillway floor panels or wall panels as compared to past maintenance inspections. The concrete comprising the ogee weir. wall panels. and Invert panels appeared to be in satisfactory condition; howeverI an old concrete patch at the base of the left spillway wall near Ste. 88 is no longer firmly attached to the wall (Photo Outlet The outlet tower and access bridge appeared to be in satisfactory condition. Work to rehabilitate the tower'_ valves has been completed. The tower has Inspected by one .-. Photos taken? NO Date of Inspection 8/25/2014 cc for Owner/ Book Date of Report Ell?{29915 owe Izsi (Rev. IcrcsI Sheet of 6 Name of Darn Castaic Dam No. 1-53? Observations and Comments Seegage Instr. INSPECTION Dr DAM AND RESERVOIR IN STATUS Date of Inspection 8/25/2014 the gate was last cycled in DSOD's presence on November 6, 2013. The Division of Operations and Maintenance has contracted with Quest Structures to review the seismic stability of the tower as part oftheir plan to develop seismic remediation options; previous stability analyses predict that the tower will likely be damaged (the magnitude of the damage Varies betvveen revieWs) during a large seismic event. The concrete compromising the-vault was found to be in good condition as was the valves of the? valves were operated except for the which reportedly had a gearing issue. atlon during the Inspection 100% "20% (titled 50% Not cycled There is a leak in the? pipeline just of the?valve. Work to rehabilitate the valve and fix the leak is expected to occur during the next outage (expected fall 2015); the? pipeline have to be dewatered to before the valve can be removed and a temporary bulkhead installed. There were no signs of seepage observed on the slope, at the toe, or along the groins. Toe seepage was measured to be ?l gpm. which is low compared to past readings and likely due to the extended period during which the reservoir elevation has been low. During the inspection I placed my air monitor on top of the toe seepage vault grate as bad air has been noted coming from the vault in the past; the monitor immediately alarmed and provided a low oxygen reading of 18.4%. inspectors should not enter the toe vault during future inspections unless there is a very good reason, this condition is mitigated (Le. forced ventilation), and other safety protocols (Le. confined space procedures) are in place. Instrumentation at this clam currently consists of 12 hydraulic piezometers. 15 open standpipe piezometers, 25 gas piezometers, 11 vibrating wire piezometel?s, 16 observation wells, 4 seepage points, 14 slope indicators, and 326 survey points. Reservoir water surface elevation. rainfall, and seismic accelerations are also monitored at the dam. The most recent instrumentation data submittal is dated August 2015 and covered the period up to December 31. 2014 (the report did not contain any new data for the slope indicators). Piezometers and observation wells show a decreasing phreatic surface through the embankment/foundation and that the internal drains are performing as designed. Pore pressures are also monitored at the dam?s left abutment by piezometers and observation wells which have indicated increasing pores pressures in the abutment over time; these increasing pore pressures owe-1251 (rev. torus) Sheet of INSPECTION 0r DAM AND RESERVOIR IN STATUS Name of Dam Castaic Dam No. 1-58 Date of inspection 3f25/20'i 4 Observations and Comments trends and any related stability issues are going to be addressed as part of 0&M?s left abutment stability review (currently on hold). There are also two observation wells located to the right of the spillway (right abutment) that do not track with reservoir elevation; often, both instruments provide ground water readings above the reservoir elevation. It is noted in the instrumentation submittal that the hydraulic piezometers readings are to be discontinued by 2017. Due to age and issues with such instruments. they have likely outlived their usefulness and discontinuing monitoring of these instruments is acceptable. It is expected that some of the left abutment vibrating wire piezometers will be replaced (or new instrumentation installed) as part of 0&M?s review of the left abutment stability; as previously discussed with personnel involved with this review1 work to install new instrumentation will require the submittal and subsequent approval of an alteration application. Seepage readings during this reporting period have been lower than average (~20 gpm) due to the low reservoir elevation and low precipitation. No concerning flows or trends are observed in the seepage data provided. One survey was performed since the previous instrumentation submittal. Data plots of the survey data shows little change from previous survey and no newfdeveloping trends noted. The data shows the embankment and appurtenant structures continue to follow past trends at a very slow rate. Except as noted above, the current instrumentation and monitoring frequency is judge adequate at this time. Photo?l Spelling patch along the left spillway wall near Station 88. owe-.1251 (M10109) Sheet 3 of INSPECTION (Jr' DAM AND RESERVOIR IN CERTII-IED STATUS NameofDam Castaio Dam No. 1-53 Date of Inspection 8l25/2014 .Photo 2 The soillway approach wa 1.. . 5 clear10;. we v. .- .. Photo 3 Spillway ogeo weir. Sheet 4 of INSPECTION (Jr DAM AND RESERVOIR IN STATUS Name ofDam Castaic - Darn Ne. 1u58 Date of Inspection 8/25i2014 I J. Photo; 5? Upstream frem the rith ebutment. DWR 1261 (rev. 10309) Sheet 5 DI INSPECTION (Jr' DAM AND RESERVOIR IN STATUS NameofDarn Castaic Darn No. 1-58 Date of Inspection 8/25/2014 Photo 6 Dcwnetream face from the left abutnrtent I- I a "?ibh?tocngetanding offset at the parking lot curb at the left abutment. DWR 1261 (rev. 10109) 511661 6 of STATE OF CALIFORNIA SALIFORNIA NATURAL RESOURCES noencv DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name oroem Castaic No. 1-58 County Los Angeles Type of [item Earth Type of Spillway Concrete Weir and Open Channel Water is 102.4 _teet below spillway Crest and 122.4 feet below dam crest. RWS Elevation 1412.6' Weather Conditions Sunny and Clear Contacts Made Jaime De_S_antiago, Joel Ouintero, Jane Randall. Amber Orloff. and Olivia Virgadamo. Reason for Inspection Periodic Maintenance Inspection Special Inspection of the Upstream Face Important Observations. Recommendations or Actions Taken 1. The stability of the left abutment is currently tinder review. A plan and schedule forthis review has been requested. 2. A plan and schedule to ensure that the outlet system can provide reliable emergency drawdown capacity following a large seismic event has been requested. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances arejudged safe for continued use. Observations and Comments Dal?m The dam crest was found to be level, well aligned, and in good condition. The low reservoir water surface elevation allowed for a large portion of the upstream soil-cemented slope to be inspected; the upstream slope was walked and found to be in very good condition and with no signs of slope instability noted. The rock covered slope was also found to be in satisfactory condition with no visible signs of instability or distress. Vegetation and rodent control was satisfactory. The stability of the dams left abutment is currently being reviewed by the Division of Operations and Maintenance (OSM) and their engineers/consultants (Division of Engineer and HDR). A letter was sent to OSM requesting a plan and schedule regarding their abutment stability review on August 11. 2014. Sgillway The spillway? were not specifically observed during the inspection due to time constraints. fall protection requirements, and confined space requirements. The spillway was walked during the March 6. 2014 maintenance inspection: the spillway walls at that time appeared to be sufficiently well aligned and there did not appear to be any significant changes to the uplifted spillway floor panels as compared to recent past maintenance inspections. Outlet The outlet tower and access bridge appeared to be in satisfactory condition. Work to rehabilitate the tower gates and repair the damaged hydraulic lines that operate the tower gates is expected to take place soon while the reservoir is low this fall. I was informed by Ms. Orloff on September 26. 2014 that work to refurbish the tower_ valves on tiers 2 and 4 (not hydraulic lines) was beginning. At the time of the inspection. work was undenrvay to rehabilitate the two =valves? It was reported that the heavily corroded - valve? will also be rehabilitated as part of this work. This work is expected to be completed by the end of September. No gatesivalves were cycled during the inspection due to the ongoing rehabilitation work. Inspected by Shawn Photos taken? YES N0 Date of Inspection $252014 ?er cc for Owner/Book Date of Report 10/5/2014 own 1261 (Rev.10l09) Sheet 07 INSPECTION DAM AND RESERVOIR IN .. .ED STATUS Name of Dam Castaic Dam No. 1~58 Date of Inspection $50014 Observations and Comments Seegage Instr. Recent analyses of the outlet towers have shown that they (and the access bridge) are seismically deficient. A letter was sent to requesting a plan and schedule regarding repairs the outlet system to ensure reliable emergency drawdown capacity on August 11, 2014. There were no signs of seepage observed on the slope, at the toe. or along the grains. Toe seepage appeared clear and was measured to be 16.4 gpm. which is considered normal and is consistent with past reading. Instrumentation at this dam currently consists of 12 hydraulic piezometers. 8 open standpipe piezometers, 25 gas piezometers. 11 vibrating wire piezometers, 16 observation wells. 4 seepage points, 13 slope indicators, 37 damfabutment survey monuments, 26 outlet tower bridge survey monuments, and numerous spillway survey points. Reservoir water surface elevation, rainfall, and seismic accelerations are also monitored at the dam. The most recent instrumentation data submittal is dated April 2014 and covered the period up to December 31: 2013. The 12 hydraulic piezometers, 2 open standpipe piezometers and 12 gas piezcmeters that. monitor pore pressures within the embankment and foundation. These piezcmeters show an expected decrease in pore pressures through the dam and foundation. These instruments also indicate that the internal drains are continuing to perform as designed (dry shell). There are also 11 gas piezorneters that monitor foundation pore pressures beneath the shells of the left and right halves of the dam (9 on the left and 2 on the right). These instruments show reasonable pore pressures (decreasing pore pressures from upstream to and low pore pressures beneath the blanket drain (indicating that the blanket drain is performing satisfactorily). There are 5 observation wells located? Readings from these observation walls have shown consistent ground water levels with some response to precipitation. There readings indicate that the spoil berm remains unsaturated and that toe drain is performing satisfactorily. Pore pressures at the dam's left abutment are monitored by 2 gas piezometers, 6 standpipe piezometers, 11 vibrating wire piezometers. and 9 observation wells. The two gas piezometers are very responsive to reservoir elevation. The 6 standpipe piezometers have provided fairly consistent readings with some response to precipitation. Readings from the observation wells and vibrating wire piezometers have continued to show a slight increasing trend in pore pressures; these increasing pore pressures trends are to be addressed as part of the dam?s left abutment stability reVIew. There are also two observation wells located to the right of the spillway. These instruments monitor ground water levels adjacent to the spillway and do not track with reservoir elevation; often, both instruments provide ground water readings above the reservoir elevation. Sheet 2 of 7 INSPECTION t. DAM AND RESERVOIR IN CERT.. .ED STATUS Name of Dam Gestalt; Dam No. 1:58 Date of inspection 8/25f20'l4 _Observations and Comments There are a few issues regarding the above noted instruments: Hydraulic plezometers and 11 provided reading below their respective tip elevations, has different ?in" and "out" readings (should be the same). and some of the vibrating wire piezometer readings are very erratic. The hydraulic and gas piezometers were installed during construction and the vibrating wire piezometers were installed in the early 1980's; these instruments have likely surpassed their expected life expectancy. It is expected that some of the left abutment vibrating wire piezometers will be replaced as part of osM's review of the left abutment stability. Seepage during this reporting period has remained consistent with past trends, appearing somewhat responsive to both precipitation and reservoir elevation. See Location Max 2013 _M_i_tl 2_013 Reading lgmp) "42. 0.5 - --.: ?1 0.1 No concerning flows or trends are observed in the seepage data provide. Long term plots of settlement data show that the maximum embankment's settlement rate is fairly small per year at the maximum section). The data also shows that design camber has not been exceeded. While more erratic. horizontal movement data shows the dam to have moved a maximum of 6" (cumulatively near the maximum section). The horizontal data shows very small continual movement of the embankment in the direction. Survey data for the left abutment indicate some areas have heaved as much as The survey monument located on the outlet tower bridge show very little variation. Cumulatively, the bridge shows a fairly uniform total settlement ranging between 0.1 to Displacements across the bridge joints are also monitored on a regular basis. While displacements vary little from iear to iearl "pint 4 oiened ui and loint 5 closed durini) the Northridge Earthquake. Survey data shows that spillway ogee weir crest has heaved as much as 0.9? and that the low point is about 0.5' above its design elevation; the ogee weir continues to heave at a very slow rate. The spillway walls and floor panels also continue to show heave at a slow rate. No trends are observed that would indicate that wall panel is expecting imminent failure (similar to what happened in 2005). The 3 slope inclinometers located in the dam embankment show no signs of slip planes or excessive movements within the darn embankment. Most of the?inclinometers show minor movements with no detrimental trends observed. The instrumentation and monitoring frequency is judge adeqUate at this time. DWR1261 (rev.10l?00) Sheet 3 of 7' INSPECTION DAM AND RESERVOIR IN STATUS Name of Dam Caetaio Dam NO. 1-53 Date of Inspection 3125/2014 Photo?l Panoramic view of the upstream face. IL I "Heat-a" 4* Photo 2- Panoramio View of the low reservoir DWR 1261 (rev. 10f09) Sheet 4 0f 7 INSPECTION DAM AND RESERVOIR IN CER1.. .En STATUS Name of Darn Castaio Darn No. 1-58 Date of Inspection 8125/2014 Photo 4 face looking towrads the left abutment. DWR 1261 (rev. Sheet 5 of INSPECTION DAM AND RESERVOIR IN STATUS Name of Dam Castaic Dam No. 1-53 Date of Inspection v_ 3/35/2014 (rev. 10mg} Sheet INSPECTION DAM AND RESERVOIR IN .. JED STATUS Name Of Dam Dam NO. 1:58 Date of Inspection DWR 1251 (rev. STATE OF CALIFORNIA a, ?a CALIFORNIA NATURAL RESOURCES AGENCY . DEPARTMENT or WATER RESOURCES DIVISION or SAFETY or DAMS '5 INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Castaic Dam No. 1-58 County Los Angeles Type of Dam Earth Type of apillway Concrete weir and open channel Water is 19.3 feet Below spillway crest and 39.3 feet BSIDW darn crest. RWS Elevation 1495.? Weather Conditions Sunny, cool, and clear Contacts Made See Below Reason for Inspection Periodic Maintenance Inspection Important Observations. Recommendations or Actions Taken None. Conclusions From the known information and visual inspection, the darn. reservoir, and the appurtenances are judged safe for continued use. Observations and Comments 9am The dam crest was walked and found to be level, well aligned, and in good condition. The upstream soi ~cemented slope and rock covered slope were in satisfactory condition with no visible signs of instability or distress. Vegetation and rodent control was satisfactory; however, some bait stations were found to be empty. It was reported that the reservoir level will likely drop 60 to 70 feet during the summer due to drought conditions and limitations on importing water. Spillway The spillway approach, ogee weir control section, and channel were clear. Overall, the concrete was in satisfactory condition throughout. The spillway walls visually appeared to be well aligned and there did not appear to be any significant changes to the uplifted spillway floor panels as compared to recent past maintenance inspections. Voids where the floor panels have heaved to the point that subgrade is visible beneath the panels should be infiIIed with concrete/grout. Th was partially walked with no signs of distress observed. The that was walked was also found to be dry. were cleaned last August; approximately 5 CY of material was reportedly removed Outlet The outlet tower and access bridge appeared to be in satisfactory condition. The outlet -was walked and were found to be in satisfactory condition. The tower valves, and the ?valves were not operated during the inspection. Some of the tower valves will re ortedly be repaired during the summer after the reservoir elevation has dropped. Th?gate has been recently refurbished and most of the valves appeared to be in good condition; however, corrosion at the?valve? still needs to be addressed. Seegage There were no signs of seepage observed on the slope, at the toe, or along the grains. Inspected by Shawn 31:3 Photos taken? Yes No Date of Inspection 201 4 cc for Owner/Book Dale of Report 51212014 6/1714. DWR 1261 (Ray. 10MB) Sheet 1 of 5 INSPECTION DAM AND RESERVOIR IN STATUS NameofDam Castaic Dam No. 1~58 Date of Inspection f. Photo 3 - Looking at the upstream face from the right abutment. DWR1261 (rev. 10109) Sheet 3/6/2014 3 of INSPECTION Name of Dam Castaic DWR 1261 (rev. 10109) DAM AND RESERVOIR IN IED STATUS Dam No. 1-58 Date of Inspection Sheet 316/201 4 INSPECTION DAM AND RESERVOIR IN GER IED STATUS 0f Dam Cm? 7 Darn Date of Ins-pectic: 35/2014 DWR 1261 (rev. 10109) Shem in. STATE OF a a; CALIFORNIA NATURAL RESOURCES AGENCY . 1: DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Castaic Darn No. 1?58 County LOS Angeles Type of Darn Earth Type of soiliwsy Concrete Weir and Open Channel Water is 21.8 feet below spillway crest and 41.8 feet below dam crest. Weather Conditions Cool and windy Contacts Made Don Amber Orloff and Joel Quintero (SFD) Reason for Inspection Periodic Maintenance Inspection important Observations. Recommendations or Actions Taken . Corrosion on th?valve still needs to be addressed. a Lar voids are detected under the stream illway slabs,? Hrhe uplift to the spillway slabs should continue to be closely monitored. The?trains were recently cleared. Th_gate was fully cycled during this inspection. - Piezometer 62813 is silted in; it is a 1" diameter PVC tube that was reported to be too small to clean out. Conclusions From the known information and visual inspection. the darn. reservoir. and the appurtenances are-judged safe for continued use, pending analysis of the stability at the left abutment. Observations and Comments The asphalt road on the crest was well aligned. level. and in good condition. The soil cement lined upstream slope was in satisfactory condition with no signs of distress or instability. The rip-rap slope was uniform and normal. Vegetation control was excellent on the dam embankment. The left abutment area was not thoroughly inspected due to a Disney Movie filming there. There were no signs of any adverse rodent activity. The offset in alignment to the curb in the left abutment parking lot remains unchanged. still measuring approximately 1.5 inches. Sgiliway The approach. open channel. and exit to the spillway were unobstructed. The floor slabs are exhibiting uplift caused by subgrade heave. The most significant uplift has occurred to the panels closest to the upstream end. There are sections where the subgrade is visible through the joints because the slabs have heaved so much. Large voids are detected under the upstream spillway slabs. has recommended leaving the panels as they are and repair them when they fail. The spillway remains serviceable and 0&M's plan for leaving the slabs as they and restoring them when they fail is satisfactory. The right spillway wall panels LT 112. 113. 114. and 115 shows the most rotation. Movement between Panels LT 112 and 113 have an offset that has increased over the years and exceeds 1 inch. The? was not accessed during this inspection but was inspected during the January 2013 ins action and found to be relatively dry and in satisfactory condition. It was reported that the *were recently cleared. and there was approximately 5 cubic yards of material removed? Inspected by Joe Bon/g/?q?i? Photos taken? Yes No Date of Inspection 3 so for OwnerfBook Date of Report 1 ?1/26/2013 Sheet 1 of I We.? '15 min/leis DAM AND RESERVOIR IN CE-R l. ED STATUS Name of Dam Castaic Dam No. 1?58 Date of inspection 11/06/2013 Observations and Comments Outlet Seepage The outlet tower appeared stable and in satisfactory condition, even though the gap in the access bridge slip joint appeared to show further expansion. The outlet-was inspected and found to be fairly dry and in good condition. There was very little seepage from the outlet-(flow of 0.36 gpm). Plastic is draped over the epoxy coated pipeline to further protect it from corrosion. The_valves consist of valves on the tower and a - The outlet was clear of debris and the?valves were open discharging water. The valve and valve were fully cycled 100% during the January 2013 inspection with no difficulties encountered. The-Ialves were full 0 cled during the February 18, 2012 outlet inspection and all the upstream tower valves and gate were fully exercised during the August 9, 2012 outlet inspection. Th ate was fully cycled during this inspection. It took approximately to open and to close. The corrosion to the?valve on the?line has not been addressed. There were no signs of seepage located on the slope, groins, or toe of the dam. The weir readings were measured with the corresponding flows: Height Flow 0.04? 0.36 024? 18.3 Dry Dry Flows were normal and within historical limits. The instrumentation for this darn consists of 12 hydraulic piezometers, 8 open standpipe piezometers, 25 pneumatic piezometers, 11 vibrating wire piezometers, 17 observation wells, 16 spillway drill holes that measure pore pressures (discontinued July 2009), 4 seepage locations, 16 slope indicators, 14 dam crest monuments, 22 upstream slope monuments, 18 slope monuments, 6 monuments (1 got destroyed in 2003) in the left abutment 360 illwa wall ins We. Also, there are 2 accelerographs? receive on monitored during seismic events. The latest instrumentation report was containing data from January 1, 2012 through December 31, 2012. all Pore pressures in the upstream Zone 18 section and upstream Zone 1 core section are highly influenced by reservoir levels, which is normal. The piezometers located in the maximum section of the core continue to follow consistent trends and the majority were relatively constant during the monitoring period. Piezometer HP-16 located in the core continues to show a slight increasing trend in pore pressure. Piezometers GP23, GP24, and GP25 are inoperable. The foundation piezometers under the core section and of the grout curtain fluctuate closely with reservoir levels and follow historic trends. The foundation piezometers located underneath the blanket drain were constant and normal during the monitoring period. The piezometers located in the Zone 3 4 sections of the chimney drain and above the blanket drain were dry, as expected. Sheet 2 of 4 ur DAM AND RESERVOIR IN GER I. .ED STATUS Name of Dam Castaic Dam No. 1-58 Date of inspection 1 1/06/2013 Observations and Comments The observation wells at the ?continue to follow historical trends. Readin are rett constant and are affected by precipitation rather than reservoir levels. The well?continue to track above reservoir elevations. The owner has reported in the past that this is probably due to naturally occurring ground water or surface water off the adjacent hillside, right of the dam. Over the years, the left abutment piezometers and observation wells have been continuing to show an increasing trend. After the leaking water tank incident, observation wells 628 and 71 were bailed in 2008 to monitor water level response. The historical plots showed these wells to still have an increased level, but have not been increasing. During the monitoring period, the following instruments in the left abutment continue to show an increasing trend: Observation Wells 528, 538, 548, 558, 628; Standpipe Piezometers 55A, and Vibrating Wire Piezometers 4048, 407, 4118, 412A, and 4128. In contrast PiezometerGP41 is showing a slight decreasing trend. Multiple vibrating wire piezometers showed erratic readings and a few may be on the verge of failing. Piezometer 6288 was reported to be silted in and the pipe diameter PVC) is too small to clean out. It was previously requested that the stability due to the steady rise in pressures at the left abutment should be further investigated, analyzed, and reported on by the owner. it was reported that the rising piezometer levels were compared to the phreatic surface modeled in the stability analysis of the left abutment completed by the Department of Water Resources in 1997 and that based on a first level approximation, the increases in hydrostatic pressures at the left abutment do not appear to significantly change the conclusions of the 1997 study, which found the abutment stabie. Seepage data over the monitoring period showed normal flows. The seepage? ran ed from 20 to 47 gpm. The?flows were less than 1 gpm. Theg_Pipe showed a trickle during major precipitation events, but was typically dry during the monitoring period. All flows are low for this size and type of dam. All the embankment monuments show a general settiement comparing the previous year?s reporting period. The monuments showed a maximum heave or settiement of 0.11?. The five slope indicators on the dam showed a maximum settlement of 0.22" from Cumulative movements show the dam has settled a maximum of 26.76? at the maximum section. However, the dam is still above the maximum settlement allowed by the design camber by a minimum of Vertical movements at the left abutment showed a general settlement with a maximum settlement of 0.2? at PA-B. Historicaily the left abutment vertical movements have heaved, and remain within 2.5? of the initial survey elevations. The largest vertical movement at the right abutment was a 0.3" settlement, but the right abutment has historically been heaving. The data shows the abutments are stable. The horizontal data for the crest monuments indicated that the dam moved between 0.06? and 0.53? with the largest movement near the maximum section of the dam. The largest cumulative movement was 7.44? from crest monument CS7 in the direction. The horizontal movements are tolerable for this size and type of dam. The inolinometers continue to show small movements for the monitoring period. No adverse trends or conditions are indicated in the data and appear normal. Sheet 3 of 4 INSPECTION gr DAM AND RESERVOIR IN CER I. ED STATUS Name of Dam Castaic Dam No. 1?58 Date of inspection 11/06/2013 Observations and Comments The spillway floor panels and ogee weir have uplifted quite a bit over time. The floor panels showed a maximum cumulative heave of 19.11?. The ogee weir heaved approximately 0.2 inches from the last survey. The ogee weir has heaved about 5? since 1984. The horizontal movements for the invert were less than 2 inches. it is reported that separation between the spillway floor panels and the foundation continue to increase. Drill-hole rods indicate the largest separation from Floor Panel 1303 with a separation of 1.25 feet at the upstream end and almost 2 feet toward the end. Separation of the spillway invert panels and foundation diminishes the further the panels are located in the channel. The spillway channel wall panels continue to show movement with the majority of deflection in the right wall. The largest vertical movement in the spillway walls was a 2.87 inches from Pin R104 in the upstream direction. Pin R105 on the same wall panel showed a movement of about 1 inch in the same upstream direction. Historical surveys show movements that fluctuate and are not trending in one direction. Joint displacements in the outlet tower bridge contracted 0.28? during this monitoring period. The instrumentation for this dam is judged adequate and no new instrumentation is required at this time. Sheet 4 of 4 or I CALIFORNIA NATURAL RESOURCES AGENCY 1: DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Darn Castaic Dam No. 1?58 County Los Angeles Type or Darn _Earth Type ofSpillway Concrete Weir and Open Channel Water is 19. 2 feet below spillway crest and 39.2 feet below clam crest. Weather Conditions Cool and clear Contacts Made See list of participants at the end of this report Reason for Inspection Periodic Maintenance Inspection lmgortant Observations, Recommendations or Actions Taken The woody vegetation growing in the ap roach channel of the spillway should be removed. The vegetation growing at the exit of th illway chute should be cleared. The first pipe coupling joint past the access stairs had a small leak and should be repaired. Corrosion on the valve still needs to be addressed. As previously requested, the stability due to the steady rise in pressures at the left abutment should be investigated, analyzed, and reported on by the owner. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use. pending analysis of the stability at the left abutment. Observations and Comments Da_m The asphalt road on the crest was well aligned. level, and in good condition. The soil cement lined upstream slope was in satisfactory condition with no signs of distress or instability. The rip-rap slope was uniform and normal. Vegetation control was excellent on the dam embankment. The water tank at the upper left abutment is still rigged to direct potential spilling water away from the catch basimwith a flexible hose, and onto the street. Vegetation was cleare an an on the anne was made to divert runoff water to the parking lot. There Were no signs of any adverse rodent activity. The offset in alignment to the curb in the left abutment parking lot remains unchanged, still measuring approximately 1.5 inches. Sgillway The woody vegetation growing in the approach channel should be removed. The channel, and exit to the spillway were unobstructed. The floor slabs are exhibiting uplift caused by subgrade heave. The most significant uplift has occurred to the panels closest to the upstream end. There are sections where the subgrade is visible through the joints because the slabs have heaved so much. Large voids were detected underneath the spillway slabs. It is recommended to fill the voids before erosion of the subgrade worsens. The right spillway wall panels LT 112, 113, 114, and 115 shows the most rotation. Movement between Panels LT 112 and 113 have an offset that has increased over the years and exceeds 1 inch. The?was accessed using an air monitor, harness, and retractable lanyard. The -remains relatively dry and in satisfactory condition. The majority of the drains were dry. but some were dripping. Some of the drains should be cleared of mineral deposits, but the majority of the drains appeared to be unobstructed. Multiple gallery sections show movements between the joints and are largest at the and. Inspected by Joe Boyce 4/15 Photos taken? YES NO Date of Inspection 1130mm; no for FIIBS Date of Report I KM are?? Sheet ?l of 6 INSPECTION Ol- 0AM AND RESERVOIR IN IED STATUS NameofDam Castaic DamNo. 1~58 Date of lnspectlortlawplli Observations and Comments Outlet The outlet tower a eared stable and in satisfactor conditio Seegage There were no signs of seepage located on the slope, groins, or too of the dam. The weir readings were measured with the following flows: Weir Height Flow 0.05' 0.6 7.3' 37.5 0.05? 0.6 Dry Flows were normal and within historical limits. The instrumentation for this dam consists of 12 hydraulic piezometers. 8 open standpipe piezometers. 25 pneumatic plezometers, 11 vibrating wire piezometers, 17 observation wells, 16 spillway drill holes that measure pore pressures (discontinued July 2009), 4 seepage locations, 16 slope indicators, 14 dam crest monuments, 22 upstream slope monuments. 18 slope monuments, 6 monuments (1 got destroyed in 2003) in the left abutment, 360 spillway wall pins, and 128 illwa chute ins. Also, there are 2 accelerograph monitored during seismic events. There was a Magnitude 4.3 earthquake that occurred 14 miles away from the dam during the monitoring period. Field personnel inspected the dam later the same day and found no abnormal changes to the dam. The latest instrumentation report was dated October 23, 2012 with updated data from January 1, 2011 through December 31. 2011. Pore pressures in the upstream Zone 18 section and upstream Zone 1 core section are highly influenced by reservoir levels, which is normal. The piezometers located in the maximum section of the core continue to follow consistent trends and the majority were relatively constant during the monitoring period. Piezometer located in the core continues to show a slight increasing trend in pore pressure of 0.7 feet per year. Piezometers GPZB, GP24, and GP25 are inoperable. The foundation pieaometers under the core section and of the grout curtain fluctuate closely with reservoir levels and follow historic trends. 3 U) owe-1251 (rev. lords) Sheet 2 of 5 INSPECTION Or DAM AND RESERVOIR IN CERT-I. STATUS Name of Darn Castaic Dam No. 1-58 Date of Inspection 1/30/2013 Observations and Comments The foundation piezometers iocated underneath the blanket drain were constant and normal during the monitoring period. The piezometers located in the Zone 3 4 sections of the chimney drain and above the blanket drain were dry, as expected. The observation wells continue to foliow historical trends. Readin are rett constant and are affected by precipitation rather than reservoir levels. The well?ontinue to track above reservoir eievations. The owner has reported in the past that this is probably due to naturally occurring ground water or surface water off the adjacent hillside, right of the dam. Over the years, the left abutment piezometers and observation wells have been continuing to show an increasing trend. Istorlca pots owe ese we 0 5 ave an increased level, but have not been increasing. During the monitoring period, the following instruments in the left abutment continue to show an increasing trend: Observation Wells 538, 54B, Standpipe Piezometers 55A, and Vibrating Wire Piezometers 404B, 407, 41 1 B, 412A, and 4128. Multiple vibrating wire piezometers showed erratic readings and a few may be on the verge of failing. It was reported that the rising piezometer levels were compared to the phreatic surface modeled in the stability analysis of the left abutment completed by the Department of Water Resources in 1997 and that based on a first level approximation, the increases in hydrostatic pressures at the left abutment do not appear to significantly change the conclusions of the 1997 study. As previously requested, the stability due to the steady rise in pressures at the left abutment shouid be further investigated, analyzed, and reported on by the owner. Seepage data over the monitoring period showed normal flows. The seepage? ran ed from 31.9 to 46.9 gpm. The?flows ranged from 0.6 to 17.6 and the hwas iess than 1.5 gpm. The Pipe showed a trickle during major precipitation events, but was typically dry during the monitoring period. All flows are low for this size and type of dam. All the embankment monuments show a general settlement comparing the previous year?s . reporting period. The crest monuments showed a maximum settlement of 0.49? from Monument 08-8 at the maximum section of the dam. The maximum settlement for the slope monuments was 0.31? from several monuments on the bench. The five slope indicators on the dam showed a maximum settlement of 1.08? from had 0.7? of heave during the last monitoring period. Cumulative movements show the dam has settled a maximum of 26.8? at the maximum section. However, the dam is still above the maximum settlement allowed by the design camber? Vertical movements at the left abutment showed a general settlement with a maximum settlement of 0.5? at Sl-410. Historically the left abutment vertical movements have heaved, and remain within 2.5? of the initial survey elevations. The largest vertical movement at the right abutment was a 0.28? settlement, but the right abutment has historically been heaving. The data shows the abutments are stable. Sheet 3 of 6 INSPECTION Or AND RESERVOIR IN CERTI: .ED STATUS NameofDam Castaic Dam No. 1-58 Date of Inspection 1/30/2013 Observations and Comments The horizontal data for the crest monuments indicated that the darn moved between 0.3? and 0.7? with the largest movement near the maximum section of the dam. The largest cumulative movement was 4.31? from crest monument CS7 in the direction. The horizontal movements are small for this size and type of dam. The inclinometers continue to show small movements for the monitoring period. No adverse trends or conditions are indicated in the data and appear normal. The spillway floor panels and ogee weir have uplifted quite a bit over time; however, they all showed settlement during this monitoring period. The floor panels show a maximum settlement of 0.35? and the ogee weir settled 0.22 inches. The ogee weir has heaved 5? since 1984. The horizontal movements for the invert were reported to be suspect and inaccurate. Multiple data showed movements over 10? and would have been clearly seen during the inspection. It is reported that separation between the spillway floor panels and the foundation continue to increase. Drill-hole rods indicate the largest separation from Floor Panel 130-3 with a separation of 1.25 feet at the upstream and and almost 2 feet toward the end. Separation of the spillway invert panels and foundation diminishes the further the panels are located in the channel. The spillway channel wall panels continue to show movement with the majority of deflection in the right wall. The largest vertical movement in the spillway walls was a settlement of The maximum cumulative horizontal movement was 1.55 inches in the direction from Pin R248, and 2.01 inches in the upstream direction from Pin R3. Historical surveys show movements that fluctuate and are not trending in one direction. Joint displacements in the outlet tower bridge have widened 0.25? during the monitoring period. The instrumentation for this dam is judged adequate and no new instrumentation is required at this time. Participants for this inspection included: Amber Orloff Joseph Burke (DOE) Joe Royer (DOE) Joel Quintero (SFD) Wilfredo Castillo (SFD) Bonnie Duecker (SFD) Hamid Eshraghi (SFD) Sheet 4 of 6 INSPECTION (J. DAM AND RESERVOIR IN CERTI. STATUS Name of Dam No. _?1~58 Data at nspac=tion 1/30/2013 DWR 12:31 (rev. 10109} Sheet 5 INSPECTION OI JAM AND RESERVOIR IN CERTI. .uz'D STATUS Name of Dem_ Cesteio Darn No. ?1?58 Date of Inspection 1(30/2013 Unlined drainage ohannel installed to divert runoff onto the parking lot. DWR 1261 (rev. 10mg) Sheet i of STATE OF CALIFORNIA . I, NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED St A Name of Darn Castaic Dam No. 1?58 I County LOS Angeles Type of Dam Earth Type of Spiliway Concrete weir and open channel Water is 17.6 feet spiliway crest and 37.6 feet Below darn crest. RWS Elevation 1497.4 Weather Conditions Clear, hot, with SIIght Wind. Contacts Made Amber Orloff, Joel Quintero, Don Walker, and Bonnie Duecker Reason for Inspection Removal of the Low Level Outlet Gate Important Observations, Recommendations or Actions Taken Low level outlet removed for inspection and maintenance. It is recommended that the gate be removed for inspection and maintenance on a 10 year cycle. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use. Observations and Comments Outlet The purpose of this ins ection Low Level Outlet slide gate. The gate had been raised for inspection and maintenance. The gate stem sections een a en 0 Si ear ossom Pumping Plant for maintenance work. Overall, the gate appeared to be in satisfactory condition, but, some issues were noted. It appeared that cover plates that had been installed on the side of the gate to prevent debris from entering open areas were either not installed or had been removed sometime in the past (Photo a number of the bolts and bolt holes for used for attaching the cover plates have rusted out. There were also a number of rust holes through the ribs on the upstream face of the gate (Photo 5). Anodes attached to the gate and gate stem (for rust prevention) were either found to be at the end of their useful life or completed used up (Photos 2 4). None of the gate?s bearing wheels were able to be rotated; however, no problems were reportedly encountered while raising the gate. Also, no problems were encountered when the gate was cycled during the previous maintenance inspection (Feb 2012). Maintenance work will reportedly include: spot repairs to the gate?s coating, the installation of new anodes, filling in repairing of rust holes in the gate, and lubricating the gate?s (Photo 4). Because of the issues noted above, the gate should be inspected and maintenance performed on a more regular basis such as every ten years. Inspected by Shawn Jones Photos taken? Yes N0 Date of inspection 8/ 9/20 1 2 cc for Owner/Book Date of Report 8/21/2012 DWR 1261 (Rev. 10/09) Sheet 1 of 5 INSPECTION .AM AND RESERVOIR IN GER STATUS Name of Darn ., Darn MD. 1:58 Dale of lr1specti0n_ Big/12 DWR 1251 (rev. 10/09) INSPECTION AM AND RESERVOIR IN DER .. STATUS Name of Dam Castaic . . Dam No. '1 68 Date of Inspection 3/9/12 DWR 1251 (rev. 10909) Sheet 3 INSPECTION .AM AND RESERVOIR IN CER . STATUS Name of Darn Dam No. Dale of InapEGlion DWR 1261 (rev. 10MB) INSPECTION JAM AND RESERVOIR IN CER . -0 STATUS Name ofDam Castajg _DamNo. fr Date of Inspection 8/911 2 DWR 1361 {rem 10(09):