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"151 .5155" 511.551 51" 5 INSPECTION DAM AND RESERVOIR IN CERT .ED STATUS Name of Dam LOS Padres Dam No. 642-4 Date of Inspection 11/09/2016 Observations and Comments Spillway Outlet Seepage inspection (Photo 1). I requested that the right abutment and the shoulder of the crest be restored to their original grade, to which Mr. Rudolph agreed. Vegetation control along the upstream and slopes was overall good. Due to the seepage conditions at the toe, vegetation growth is aggressive and the owner needs continue to control the growth in this area, as well as the woody vegetation that is reemerging on the slope. No concerning rodent activity was observed. The floating weir project associated with the alteration application filed on February 8, 2011 and approved on October 30, 2015 has been completed. The floating weir attached to four piers embedded into bedrock and the pipe installed through the spillway?s concrete ogee weir appeared in good condition. The reservoir water level was low and the Behavioral Guidance System?s floats and steel plates were partially lying on the ground of the reservoir (Photo 2). The approach, control section, and exit were clear of concerning debris. The concrete comprising the ogee weir, invert, and channel walls appeared aged and in serviceable condition. I walked the entire spillway channel. The panel joints to both the invert and walls appeared adequately aligned, and the weepholes were dry and clear. No distress or instability was observed in the concrete that comprised the structure. Repairs to th_ upstream -gate have not yet been completed as requested during the previous maintenance inspection. The gate is in the fully open position and the owner has scheduled to complete the repairs by July 2017. The is leaking, and the plywood against the stream?s embankment continues to provide erosion protection. As stated in the previous inspection report, the -valve is scheduled for either repair or in-kind replacement. Mr. Rudolph did not know the schedule for the valve replacement. All of the outlet valves were cycled during this inspection, and they all operated satisfactorily. The face and upper groins were dry. Long standing seepage was observed along the lower portion of the left groin and near the right groin contact with the toe. The left groin seepage is collected and measured at the Spring 6-inch Parshall Flume, and seepage measured by the Toe 6-inch Parshall Flume. Seepage from the Toe Flume is pumped into the channel. Although the Spring Flume was dry, I could hear water flowing beneath the large boulders that lined the area near the flurne. The pump associated with the Toe Flume was not operating during this inspection and the flume was inundated with water (Photo 3). The owner is currently designing replacements for the Parshall Flumes with a more accurate system to measure the seepage at the toe of the dam, and am working with the DWR 1261 (rev. 10/09) Sheet 2 Of 5 .5 DAM AND RESERVOIR IN IED STATUS Name of Dam Los Padres Darn No, 642-4 Date of Inspection 11/09/2016 Observations and Comments owner for an acceptable replacement. The slide debris from the surficial rock fali slide that occurred in December 2014 in the left abutment above the outlet works has been removed and concrete K-ralls have been installed to protect the valves from further rock falls. The area of concern appears to have stabilized, and the owner has scheduled to complete the stabilization of the slope by the end of June 2017. The dam and the reservoir?s watershed are located within the July 2016 Soberanes Fire incident. The fire did not damage or effect the operation of the dam. The fish collection and bypass system has a floating debris boom that is designed to collect and contain floating logs and debris. The owner needs to contact DSOD if post-fire debris flows affect the safety of the dam or reservoir. Instrumentation for this dam consists of survey monuments, observation wells, and seepage measurements. The most recent instrumentation submittal was received on April 26, 2016 and covered the reporting period through December 2015. Survey Monuments The dam has six survey monuments that are located along the crest and the surveys are scheduled on a biennial basis. The last survey was performed on December 28, 2015. The survey data included a long-term plot since 1992 and a 5-year short term piot. Historically, the vertical movement has been minimal over the 20?year plotting period. Between the 2013 and 2015 surveys, a maximum vertical heave movement 0? occurred at Monuments 3 and 4, and Monuments 1 and 5 showed similar behavior. Lateral movements have historically had oscillatory movements of 0 .02?ft (0.25-inch) from year to year. Between the 2013 and 2015 surveys, the maximum movement of? (.36?inch) occurred at Monument 4, and there appears to be a slow and slight defiection trend on all the monuments. Since 1992, the total maximum deflection has been approximatel_. A crack in the spillway that wasmeasured in past surveys using reference nails could not be located by the owner?s staff or the new survey company that performed the 2015 survey, and the report stated that a continued effort to locate the nails will be made. Historicaily, year to year crack movements have been negiigible. A different survey company performed the 2015 survey, and this could explain the observed changes in the vertical measurements. Continued monitoring of the possibie heave condition is warranted. Overali, there are no concerning trends or abnormal behavior indicated by the survey data. Observation Wells There are four embankment observation wells installed into the slope. The tip elevations of Test Weils 1 and 2 are located at El. 947 and the tip elevations of Test Welis 3 and 4 are located at El. 936 and El. 937, respectively, and these tips are located Within Zone i of the embankment. The wells are influenced by both the reservoir water elevation and by large rainfall events. The water surface elevation readings during 2015 continue to follow historic trends. The observation well water levels have remained consistent during the 15- year plotting period, and ignoring the short?lived iarge spikes, are at or below the assumed phreatic surface deveIOped by G.W. Dukleth in 1953. Seepage Flumes The dam has two 6-inch Parshall flumes; the Spring Flume measures seepage at the lower left groin, and the Toe Flume measures seepage at the toe. Sheet 3 of 5 533333333 1. .. 3332.333 ??iggwmaxm 33331 3&3 3233133 Name of mam- Lag. 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The: {Miner is. currently ci?agig?i?g Ia. regal-agema?f far the Farah-aft? fiumas, and mark with: 313 answer far an, agaegiabm mp?iawmem. ?m??35?ma - 35m avaiiabie .ifng?umemtaiim data in?iaates the. 913m: my-fmm?gng mien: The existing i'rxsiramzema?an email their. mania-rim frequ??cy' are i?tis?iigjed suffimieni at this; iime. wit? warki. with We: swam in ramming ii'ghes ?umas mane. 3033;237:313: maamm-aea?paga at Etha: dawns'tream feta eff'E'ha dam ~13 . ~33 y-wa?; sang-ed by 9853333238?! .sz (rev. 3.8.53.9} .. $1339.: 4 3345;,? ,Wg 23/ W, Symem . g" 3 3? If 2' Sheet 13mm$z Dam-No. 134M 5. EA Gate;- ij- inspection ?1 1f99120i?l6 33AM. RESERVQER. EN 352?: rag. 5?th 3 A View a? the 3?03 Fin-me ?inundated Wifh water; I 6: . 'Lacw?l 33333331423325. .. .1 Ii :P?hotr: .2. A view-Q? the {mates and 335.653- piate?A: 0f the: Bah-av-iara! Guidance: mam-.3333 Pad-res: DWR 12$ ?say. STATE. ETE EAL: 333333.333: ETTEETTET - . 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TEE ewner TET E33 TEE (TEE-33E TEE TEE-T TEE-TE- 53? 3:333:33 TEE - TE TEST 0239303333 and 3533: TE TIT-3E. .ETEET. ET: 603331335?:an E. REE-TEE 33333 33333333332333 during The EETTET-T.TTETTETT TE The-Tr OTTQTITTET $33.56. I I E. SE The 5353' TEE dEm. . . End ETE-LTET The. dam. E335 ITETCTETETT TEE :3 EAR-ET 3 . En? T-ETEETTET TE ET TT 333ng 313.3 3E 333W TEE ETTETEETTET 33 (33:33. 3333193 333' INSPECTION DAM AND RESERVOIR IN ED STATUS Name of Dam LOS Padres Darn No. 642-4 Date of Inspection 1 1/03/2015 Observations and Comments Dam Spillway Although the graded crest appeared stable, the recent construction activities for the fish bypass system have caused minor damage pot holes and wheel rutting) to its surface. I was informed by Mr. Fraser that the low sections in the crest will backfilled and compacted with suitable material after the project is completed. The visible portion of the upstream slope was littered with large rocks and had a hummocky appearance and the slope was lined with riprap. Both the upstream and slopes appeared in satisfactory condition with no sign of loss of grade, sloughing, or instability. The left abutment appeared stable and the groins and toe area appeared normal. Pedestrian and recent construction activity has caused minor damage to both the upstream and right abutments, near the left spillway wall (Photo 2). I requested that both surfaces be restored to their original grades after the construction project was completed, to which Mr. Fraser agreed. Vegetation control was good along the upstream and slopes. Due to the seepage conditions at the toe, vegetation growth is aggressive, and the owner should continue to control the growth in this area. Minor rodent activity was noted along the shoulder of the crest, and I requested Mr. James to increase rodent abatement efforts if the activity increased. The approach, control section, and exit were clear of concerning debris. The concrete comprising the ogee weir, invert, and channel walls appeared aged and in serviceable condition. The panel joints to both the invert and walls were adequately aligned and no distress or instability in regards to the spillway concrete structure was observed. The work associated with the alteration application filed on February 8, 2011 and approved on October 30, 2015 is nearly completed. A floating weir attached to four piers embedded into bedrock has been installed at the approach to the spillway as part of the fish bypass project (Photo 3). An 18?inch diameter fish bypass pipe had been installed through the spillway?s concrete ogee weir (Photo 4) and is attached to left spillway wall for approximately 150-ft, and then exits through a left spillway wall penetration (Photo 5). The inspection of the installation and grouting of the bypass pipe through the spillway was covered during my September 19, 2015 construction inspection. An attempt to cycle th_ gate was made and problems were encountered with the the outlet controls. It appears there was not sufficient pressure to actuate the upstrea gate. Mr. James agreed to repair the upstream - to its full functional capacity. An unauthorized outlet modification was observed during East year?s January 21, 2015 inspection which consisted of connecting a modifie_ blind flange with a gate valve just of th valve. As requested in our letter dated February 13, 2015, the flange and valve were removed. As stated in the letter, no modifications may be made to the dam or its appurtenances without our prior review and approval. The is leaking and a piece of plywood has been placed against the stream?s embankment to provide erosion protection (Photo 6). According to Mr. Sheet 2 of 10 INSPECTION DAM AND RESERVOIR IN ED STATUS Name of'Dam LOS Padres Dam No. 642-4 Date of Inspection 1 1/03/2015 Observations and Comments Seepage Jenkins-Warrick, the - valve is scheduled for either repair or in-kind replacement. All of the outlet gates/valves were cycled during this inspection, and they all operated satisfactorily. The pipe penetrates the spillway structure and the pipe discharges into the spillway channel of the ogee weir. An upstream gate controls the flows through this pipe Although this high?level outlet is not required for DSOD emergency drawdown requirements, it was last cycled during the November 7, 2013 inspection. The unencased siphon pipe which was installed over the left spillway wall and along the right abutment was removed during the fish collection and bypass system construction project. It is anticipated that the Owner will file an application to install a new high level siphon pipe in the near future. The face and upper groins were dry. Long standing seepage was observed along the lower portion of the left groin and near the right groin contact with the toe. I requested aggressive annual vegetation control in the toe area and to improve the drainage of the standing water near the right groin/toe contact. The left groin seepage is collected and measured at the Spring 6?inch Parshall Flume, and seepage measured by the Toe 6-inch Parshall Flume. Seepage from the Toe Flume is pumped into the channei. The following seepage was measured at each of the Parshall flumes: Spring Flume 0?inch, dry Toe Flume 0.125?inch 2.3 The seepage flows were clear and these values are consistent with the reservoir?s water level during this inspection, which was low. The seepage is typically larger for higher water levels. The Toe Flume is aged and in deteriorated condition. I observed that not all the seepage in collection of area of the Spring and Toe Flumes was being captured. Mr. Jenkins-Warrick informed me that the accuracy of these flumes is in question. Manual measurements using a 5-galion bucket and stopwatch show the Spring Flume is overestimated between item-130%, and Toe Flume measurements are underestimated by 10%?20%. Due to my observation of the conditions at the toe of standing water near the right groin, seepage not being captured by the flumes, measurement accuracy issues, and the deteriorated condition of Toe Flume, i recommend that the owner investigate replacing the exiting flumes with a new and improved measurement system. If the owner decides to modify or replace any of the measurement devices, DSOD must be notified and approve of the changes. The slide debris from the surficial rock fall slide that occurred in December 2014 in the left abutment above the outlet works has been removed and concrete K-rails have been instailed to protect the valves from further rock fall (Photo 9). The owner is currently acquiring the necessary regulatory permits to further stabilize the slope; this work is considered a maintenance activity and no application will be required. Sheet 3 of 10 INSPECTION DAM AND RESERVOIR IN ED STATUS Name of Dam LOS Padres Dam No. 642?4 Date of Inspection 1 1/03/2015 Observations and Comments Instrumentation for this dam consists of survey monuments, observation wells, and seepage measurements. The most recent instrumentation submittal was received on May 5, 2015 and covered the reporting period through December 2014. Our comments relating to the horizontal movement time?plots, providing a cross-sectional view of the darn with well locations, and modifying long term plots to facilitate the interpretation of the data in our November 11, 2013 instrumentation review has been adequately addressed. The instrumentation report is well organized and provides a thorough and careful engineering evaluation of the data. Survey Monuments - The dam has six survey monuments that are located along the crest and the surveys are scheduled on a biennial basis. The last survey was performed on September 10, 2013. The survey data included tabular data since 1960, a 20?year long-term plot, and a 2-year short term plot. The data indicates that vertical movement has been minimal over the 20-year plotting period with insignificant changes. The lateral movements over the same period appear oscillatory and movements of 0.02-ft (0.25-inch) from year to year are typical. The magnitude of these movements are non-concerning and within the accuracy of the survey. There are no concerning trends or abnormal behavior indicated by the survey data. Observation Weils There are four embankment observation wells installed into the slope. As requested in the previous instrumentation review, the reports included a cross-sectional plot with well tip and surface elevation locations. The long?term plots were also improved in terms of and interpretation of both the short and long-term data. The tip elevations of Test Wells 1 and 2 are located at El. 947 and the tip elevations of Test Wells 3 and 4 are located at El. 936 and El. 937 respectively and these tips are located within Zone of the embankment. The wells are heavily influenced by large rainfall events. The water surface elevation readings during 2014 continue to be consistent with the assumed phreatic surface deveIOped by G.W. Dukleth in 1953. The observation well water levels have remained consistent during the 16-year reporting period with no concerning trends being noted and the phreatic surface is assumed to be at a safe level. Seegage Flume The dam has two 6-inch Parshall flumes; the Spring Flume measures seepage at the tower left groin, and the Toe Flume measures seepage at the toe. ln the report, the seepage data included a table of daily readings for 2013-2014, a 16?year long- term plot, and a 5?year short term plot. During the 2013-2014 reporting period, the maximum flow recorded at the Toe Flume was 49.4 gpm, and the maximum recorded flow at the Spring Flume was 18 gpm. During the reporting period from January 2010 through December 2014, the maximum discharges at the Toe and Spring Flumes were 134.7 and 539 respectively. Both flumes appear to be influenced by the reservoir?s water elevation and the spikes in the data appear to be reiated to large rain events. The measured seepage during the 2013-2014 reporting period is within historicai norms. There are no concerning trends or abnormal behavior indicated by the seepage data. The report listed the following deficiencies with the existing Parshall fiumes; 1. The existing flumes are not accurately recording the seepage. The report compared manual measurements with a 5-gallon bucket and stopwatch with staff gauge heights and tables for both the Spring and Toe Flumes. It was found that flows calculated for the Sheet 4 of 10 DAM AND RESERVOIR IN CERT STATUS Name of Dam LOS Padres Dam No. 642-4 Date of inspection 11/03/2015 Observations and Comments Spring Flume from staff gauge measurements was 116%?130% greater than the measured flows, and the flows calculated for the Toe Flume from staff gauge measurements was 10%-20% less than the measured flows. 2. Not all the lower left groin seepage is being captured by the Spring Flume. 3. The Toe Flume is in poor condition. The report recommends the replacement of the Parshall flumes due to the above listed deficiencies. I concur with the recommendation that the fiumes be replaced with a more accurate measurement system, and I will work with the owner for an acceptable replacement. Conclusions - The available instrumentation data indicates the dam is performing adequately. The existing instrumentation and their monitoring frequency are judged sufficient at this time. I will work with the owner in replacing the flumes so they more accurately measure seepage Sheet 5 of 10 6%3 ?zm, WK Enema? ram. vm?am . . . . .mmaza. . mam. ?savages A. A . 5/ w, zg/VV 2 .. 02Emmy?m a? ?gm. ,amuw. EE mama m? a, 3. . mw?wwm?. w?m?w mm. ?mm?w ?mum mm??gm?mw 235 $023. POM. . . mw? ma?a? .mmwm?. ?magma/gnu . 363. my ?ag. 9? m3. gamma Ema ?m?mma mm .mwm maxim? @3430? 3m ?g .meme 2am, ?mum mw?q?mw Emmamc? Ema. . 0an mamb. 0me a $33: ?aw?gm n? Zip/?g. G, 005$an 863. mama? a: 5 .DWR 933% a; 353;} Sheet of Phat-c3: 83. A. 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DAM AND RESERVOIR IN CERT STATUS Name of Dam LOS Padres Dam No. 642-4 Date of inspection 1/21/2015 Observations and Comments the ?Toe Flume.? Mr. Jenkins-Warrick identified a location along the lower left groin where seepage may not be captured by either weir. Clear flows were observed emanating at approximately 1?2 gpm. The location is of the ?spring flume?, and flows disappear into the face rock. The condition is not alarming, but needs to continue to be monitored for changes. The following measurements were taken at each of the Parshall flumes: "Spring Flume? 1?inch (~18 gpm) ?Toe Flume? 5/8-inch (~11.3 gpm) The seepage conditions are considered normal. The owner has questioned the accuracy of the flume measurements. The neck of the ?toe flurne" actually measure-; past inspection reports have also reported this fiume to be less than 6- inohes. The owner inquired during the inspection about making modifications or changes to the seepage instrumentation. I requested the flume measurements be verified with a bucket and stopwatch and recommended if no significant difference in measured seepage is evident conditions remain as is. If the owner decides to make changes or modifications to the seepage instrumentation DSOD needs to be notified and approve the changes. instrumentation for this dam consists of survey monuments, test wells, and seepage measurements. The most recent instrumentation submittal was submitted with an owner?s letter dated October 8, 2013. The submittal was reviewed in our 1/6/2014 inspection report and found the dam to be performing adequately. Several comments regarding the owner?s instrumentation submittal were listed in our last report. The owner has been working with DSOD to address these comments and submitted a draft report for our review during this inspection. Pending our comments on the draft submittai the new instrumentation report needs to be submitted in a timely manner and annually thereafter. During the inspection, the owner identified a location of a recent landslide approximatel_ of the toe of the dam, and left of and above the outlet platform. The landslide slope above the platform was approximatel_in vertical height. Evidence of past rock fails existed, but the main occurrence reportedly happened in mid?December 2014. The slide does not cause a safety concern to the embankment of the dam, but can potentially damage the pipes and valves. There are large rocks located on the outlet platform as a result of the landslide. The railing along the platform prevented the rocks from damaging th? pipes and gates. The owner had concerns of the rock falls last summer and had a consultant, Pacific Crest Engineering Inc, visit the site on July 28, 2014. The consultant?s report on the landslide hazard is attached with this report. The owner is investigating options fer stabilizing the landslide slope and investigating a means to remove the fallen slide debris. This work is considered maintenance related and will not require our review or an application. I notified the owner that future occurrences related to the safety of the dam need to be brought to attention immediately. Sheet 3 of 6 55.9% a?mam I rl/rr/rl/lr I VNE 3. 3mm mem dz. ES. @333 m3 ma?a mm? 2? maimwmm a? ?g mg mg?m?gmw mas? ma: R?'?r?mmza cam mam amm? Name Gfi?amI Les F?g??res I II I I - .3891 53.3-- 54m?; {3an Iii} 53.5333383? I I 7 1?2 5 \xi\"nglEff-grain,- wh?zch diggipaies mic: {?mismsireaam face rag-K .. am; 15251. Shag: i? . SEEMS SE2 is? QN SEEKERS: SN: RES-EQURSES FIN BEVESED-N QF ENAFLE SF BAMS EDEF ANN EN. Name. FISENEESS ENS-NEE F3351 REGENESESNE Type Type .GQSS Weir and; CENSENENENE 33 .6. fee: ENSEGEN SESSESIES 5E5 ESE-E .. beiew GEE-ES: SENSE. . Ems Eager Huber: SENSE Amer} ESE-SE: ENE-SS: EQE 35:31:36 ESE: F?eimdm ENE ASEESENS TENS EEN ENE. EENS TENSF SS EN: the 23:3 EENSEESSEESEN ESQENEE ENSE: NE: ESEESES. 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TENS war-NE and were upstream ENES was EEC-.1712 SNEENESNE SS.- mt NE: Em: flaw EENSE was being :SES-zase'd EENE. ENS Name: The 'UpS'Ef?am was East: SENSE SE: in {3.8.0173 the: 25" 29:2 SENEE ES SEE Ema: ESNSE SEN: SENENNES SENSE ENSEE: .SNESESEE {Eating NE Enspeated' ENE BEEF {$31133 E1 ngg?sNaggn-N: NE: .NSES SE .E . 31:33 {3?3 3 if, 3f?? . . . i? SEEN: OWENSE Beak SEEN: a: -. EE EE. DWR ESSE SENSE: a: INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam LOS Padres Dam No. 642-4 Date of Inspection 1 1/7/2013 Observations and Comments Seepage previous year. There is also a outlet pipe The pipe penetrates the structure and the pipe discharges into the spillway channel of the ogee weir. An upstream _gate controls the flows through this pipe and is attached to the concrete spiilway structure at the approach. Mr. Lignefelter fully cycled this slide gate and the operation went smoothly. The owner also makes fish releases from a siphon pipe, which traverses over the left spillway wail and along the right abutment of the dam. The pipe has the potential of rupture that could damage the slope, and an alteration application filed on February 8, 2011, which includes proposed work consisting of the construction of an interim fish passage with a floating weir surface collector and a bypass conduit. This project is currently on hold and no start date has been scheduled. The face and upper groins were dry. Moist conditions were observed along the lower portion of the left groin. This seepage is longstanding and is collected and measured at the Spring Flume. Seepage measured by the Toe Flume. Seepage from the Toe Flume is pumped into the channel. The following seepage was measured at each of the 6-inch Parshail flumes: Spring Flume 0-inch, dry Toe Flume 0.25?inch 3 The seepage flows were clear and these values are consistent with the reservoir?s water level during this inspection, which was low. The seepage is typically larger for higher water levels. Mr. Lingenfelter discussed the installation a gate valve in the overflow pipe connecting the depression at the Toe Flume with the pool in 2010. The -valve replaced a- valve that tended to leak when the pooi was higher than the depression at the Toe Flume thus creating an erroneous flume reading. According to Mr. Lingenfelter, the -valve prevents the backflow of water into the Toe Flume, and the accuracy of the seepage readings have improved with the replacement of the- valve. instrumentation for this dam consists of survey monuments, observation wells, and seepage measurements. The most recent instrumentation submittal was dated October 8, 2013 and covered the reporting period through December 2012. Survey Monuments The dam has six survey monuments that are located along the crest and the surveys are scheduled on a biennial basis and the last survey was performed on September 10, 2013. The survey data included tabuiar data since 1960, a 20?year long-term plot, and a 2-year short term plot. The data indicates that verticai movement has been minimal over the 20-year plotting period with insignificant changes. The lateral movements over the same period appear oscillatory and movements of 0.02-ft (0.25-inch) from year to year are typical. The magnitude of these movements are non-concerning and within the accuracy of the survey. There are no concerning trends or abnormal behavior indicated by the survey data. 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I T1157 513111115111 55131 551.11 55511571 5551.155. 51-1121 55511151155111 51155115151515 51551511711 1.111513511115155 T115- 175551 1.1511 1555 5131111151 5.11 1.11.1.5 17151.5 5111.1 1115 5511151511 11155 111511-155 1175111 51.5115 1.11157 1.51.1 511.115 1-511. 575.1 11515 .1 1111511. Th5 {7511517515 1511151555 in 13.555 5511511155 11111111. 115 5155111111; 51 511511111131 575755711155 {311.1151 T115 11135117513111.5515 11-1115 5'11 1.15.1155 5552551751511 151.111- 1115 _511115115-5515 15211.11. 511515171 111. 7571755571155 .5111-1155-1?21112. 11.11111 11.5 517511151115- "17115-55155 5115111511155 517.5 1.1151755 1.311 1-115- 551115-17 511111.113! T1715 513511755111 551.5 17155 155.151.1515 571.1 1"12120 1.2 5.1.111 1711.5 55111115115511?? $515.11. 5115 . .. 11175131351551.3531 1 11171713151155 511-1151- 31 132. P115115: 1.2115111 1?53 15?; 1111-..-.-- 13515 51711153551151 21912511 111555 55151: 13111151255511 . 1351.5 5111555711 21211121113 1.1115115 1311511.251711151115551 7- 131113517 ?1 01 4 "i DAM AND RESERVOIR IN STATUS Name of Darn Los Padres Dam No. 642-4 Date of inspection 2/6/2103 Observations and Comments Seepage valves were last cycled on 10/12/2012. There is also a pipe at the spiliway. The pipe runs under the spillway section and discharges into the spillway of the ogee section. The outlet is equipped with an upstream -gate, which is reportedly regularly cycled when the reservoir is below the gate. The owner also makes fish releases from a siphon pipe, which runs over the left spiliway wall and along the right abutment of the dam. Previous reports have noted the difficulty of access for the siphon control and the fact that a pipe rupture can cause potential damage to the face since the pipe is not encased. These issues are being addressed in the aiteration appiication filed on February 8, 2011, which includes proposed work consisting of the construction of an interim fish passage with a floating weir surface collector and a bypass conduit. No seepage was observed on the face or upper groins of the dam. Live seepage flow was observed along the lower 1A of the left groin. This seepage is collected and measured at the "spring flume?. Seepage measured by the "toe flume?. Seepage water from the ?toe flume? is pumped into the channel. The following seepage measurements were taken at each of the 6?inch Parshali fiumes: ?Spring Flume" 3/4-inch ~12 ?Toe Flume? 7/8-inch ~15 These seepage measurements are consistent with measurements taken during past inspections and are considered normal. Instrumentation for this dam consists of survey monuments, test wells, and seepage measurements. The most recent instrumentation data was submitted with a cover letter on September 12, 2012, for calendar year 2011. Survey Monuments: The dam has 6 survey monuments, which are surveyed for horizontal and vertical movement. Surveys are scheduled for every 2 years. The last survey, in 2011, was reviewed in the 4/25/2012 inspection report. The data reportedly showed the dam to be very stable with little or no movement. The next survey is due in 2013. Test Wells: The dam has 4 test wells. Data for 2011, continued to follow historical trends and mirror fluctuations in reservoir elevation. The wells continue to be influenced by precipitation, as anomaiies in the readings are observed during the winter and spring. Excluding these anomaiies, the well data continues to foliow the assumed phreatic surface developed by G.W. Dukleth in 1953. Seepage Plumes: The dam has two 6-inch Parshall flumes, as described in the seepage section above. Both flumes continue to fluctuate with changes in the reservoir elevation. in 2011 seepage ranged from 9 to 67 at the ?toe flume? and ranged from 4 to 54 at the ?spring flume?. The recorded range is consistent with data measured since 2009, with spikes in the data believed to be influenced by precipitation; however, the ?toe flume? data has recorded a higher average annual reading over the last two years. The average annual readings appearto have increased from approximately 18 to 36 gpm. As stated in the last inspection report, the ?toe flume? should continue to be closely monitored for an increasing trend and the increase in data needs to be addressed in the next instrumentation submittal. I Sheet 2 of 4 ?2 mm; QER Marne-51:53am Lissa $431; Date: 253$"; 33' {Jabsmvatia-m: .23;ng gm: term time mats; rangihg mm; 12 ?at; ma nee-a it} abs Emmet: this: may: Eastmmanta?m guiami-tta'i aflang with {fax-3 time ?bres-amt submitted? The data. indiaatas Eh aft ma dam. can?fnxge-g "i13- m-rfmm sai?isfaetm?iiyg ?we. @ka is; Zia bsa magnate, "and additiermi iimtmmemai?an is amazed. necewau .31 Ms $756. DWR 1.2m 1.6mm:- Sheet 3 (if a: mm?w?mm??zm . U35 ?93m? ?mwm ?me imam, .mmw? ?ham .mu.ma.wmm 5mg 26. mmnm? 6me cm. mammnmoan: om. f/ ,w . .. (I. .59. I. 3:3.an Emmi ?a??mmg mam . mama. Em: ram .mgm Em: .92m $3 35% wing?. Am. .3 m.