STATE OF CALIFORNIA CALIFORNIA NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Dam No 1?056 _County Alameia?_ Type of Dam Earth _Type of Spillway Water is 50 feet below spillway_ crest or 78 feet below darn crest Weather Conditions Warm and clear Contacts Made Dan Garcia Larry Lepez, Abraham Erdom, and Jim Sung (OBIIVI crew) Reason for Inspection Periodic inspection Impertant Observations Recommendations or Actions Taken As requested previously, the following items need to be addressed: - The 42~inch fixed cone valve and the 60~inch butterfly guard valve need to be fully cycled in presence during the next inspection or year 2017. I The sump pump at the COW tunnel entrance needs to be repaired. isolated brush on the upstream and slepes of the darn needs to be removed (Photos 1 and 2). The owner needs to make arrangements to remotely measure the COW tunnel seepage since the access to the seepage weir at the tunnel entrance is considered confined space entry since 2007. Per the DSRB recommendations, the owner plans to install new open-tube piezometers to replace the hydraulic piezometers by 2017, which is acceptable. Conclusions From the known information and visual inspection. the darn. reservoir, and the appurtenances are judged satisfactory for continued use. Observations and Comments Da_m The visible portion of the upstream slope appeared to be satisfactory with no signs of slope instability (Photo 1). The rock riprap was intact and appeared to provide efficient erosion protection. The rock?covered slope of the dam also appeared to be satisfactory (Photo 2). Isolated brush on the upstream and slopes of the dam needs to be removed. The paved dam crest appeared to be uniform and well maintained. No significant rodent activity was noted. Spillway The spillway approach, gloryhole entrance, tunnel exit, and the channel were clear and unobstructed. No visible concrete or structural deficiencies were observed on the spillway training walls or on the visible portion of the glory hole. Inspected by Pirathapan I I I Photos taken? Yes No Date of Inspection I cc for Owner/Book Date of Report 12/8/2016 Sheet of 3 Name of Dam DGI Valle No. 1?056 Date of inspection 11/16/2016 Observations and Comments Seepage Th?valves were cycled in the presence of DSOD on 11/26/2013 and 11/28/2012, respectively. The owner needs to make arrangements to fully exercise these valves in presence during the next inspection or year 2017. All valves/gates used for emergency drawdown need to be fully cycled annually by the owner and in presence every three years. No signs of seepage were observed along the toe or abutment contacts.? seepage is measured in the seepage weir at the-entrance. The weir was submerged due to the sump pump failure. The owner needs to repair the sump pump. The- seepage is not measured now due to confined space entry requirements. The owner needs to make arrangements to remotely measure the tunnel seepage. A flow rate of approximately 159pm was observed in the toe drain weir box, which is normal. The flow was clear. The dam is provided with piezometers, survey monuments, and seepage measurement devices. The latest surveillance and monitoring data extend through December 2015. No periodic readings are collected in the embankment hydraulic piezometers since 2006due to confined space entry requirements and unreliable readings. The owner takes readings only after any significant event such as an earthquake. Perthe DSRB recommendations, the owner plans to install new open-tube piezometers to replace the hydraulic piezometers by 2017, which is acceptable. The hydraulic piezometers will be left in stand-by condition. The abutment open?tube piezometer readings showed the usual trend with acceptable fluctuation. No increasing trend was observed in the piezometer readings. Over the past ten years, the maximum settlement of the embankment monuments is less than 1/2- inch. The annual settlements are not significant. Historically (since 1968), the embankment monuments have settled between approximately 1% inches and 13 inches. Considering an operational freeboard_ these settlements are not a concern. The centerline survey proposed last year has not been performed yet and the owner is recommended to do a centerline survey in the next three years. The upstream and survey monuments showed a maximum settlement of less than 1A-inch in the last ten years. The annual settlements are very minimal. Horizontal movements in the upstream and monuments are not a concern. They followed the historical trend. The toe drain seepage was normal. The flowrates fluctuated between 10gpm and 20 which is normal. The observed flowrates were below the threshold level of 27gpm. The? seepage has not been recorded since 2007 due to confined space entry requirements. The existing instrumentation is considered adequate and no additional instrumentation is judged necessary at this time. The dam performance is judged satisfactory, based on the available data and my observations. Sheet 2 of 3 Name of Dam Del Valle ..1 No. 1-056 Date of Inspection 1 1/16/2016 - litre-L?; Photo 1- The riprap-oovered upstream slope of the dam appeared to be satisfactory, except for locally grown brush, which needs to be removed. Photo 2? The slope was Spotted with isolated brush, which needs to be removed. DWR 1261 (rev. 10:09) Sheet 3 of 3 STATE OF CALIFORNIA CALIFORNIA NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Darn DBI VBIIE Dam No, 1;0_55 _County Alameda Type of Dam Earth fill Type of Spillway Glory hole Water is 60.? feet below spillway crest or 88.7 feet below dam crest Weathet Conditions W_a_r_m_aI_1d clear Contacts Made _Dan? Darcie? _ __arry Lgoez (Dali/I Dam Safety); Abraham Erdom Rich Rodriguez (DFD). Mechanics Reason for Inspection _E?eriodic inspection Important Observations, Recommendations or Actions Taken The? were fully exercised on 12/13/2015 with no problems. hc? valve are due cycling In presence during the next inspection. The sump pump at the?entrance needs to be repaired. Conclusions From the information and visual inspection, the dam, reseryoirr and the appurtenances are judged satisfactory for continued use. Observations and Comments__ . Dog The visible portion of the upstream slope appeared to be satisfactory with no signs of slope instability (Photo The rock riprap was intact and was in a good condition The rock? covered slope of the dam also appeared to be satisfactory with excellent vegetation control. The paved dam crest appeared to be uniform. No significant rodent activity was noted. Spillway The spiilway approach, gloryhole entrance (Photo 2). tunnel exit, and the channel were clear and unobstructed. No apparent concrete or structural deficiencies were observed on the visible portion of the glory hole. Flood Control Outlet Works FCOW Outlet Conservation outlet works (COW): outlet pipe. valve, and seismic straps appeared to be satisfactory. The Inspected by Pirathapa_n 1i'I Photos taken? Yes No Date of Inspection 1 1/19/2015 and 12/18/2015 cc for Owner/Book Date of Report 12/28/2015 . own 1251 (Rev. 10/09) Sheet_ 57/5 Name of Darn Del Valle Darn No. 1-056 Date of Inspection 11/19/2015 12/18/2015 Observations and Comments floor generally remained dry, except for the entrance where the sump pump has failed; standing water was observed and the owner needs to repair the sump pump. Th?valves were cycied in the presence of DSUL) on 11/26/2013 and 11/28/2012, respectively. All valves/gates used in the emergency drawdown should be cycled annually by the owner and in presence every three years. Seepage No signs of seepage were observed along the toe or abutment contacts. The seepage weir at the-entrance was submerged due to the sump pump failure and the blockage in the drain hole. The owner needs to repair the sump pump and clear the blockage. A flow rate of approximately 18gpm was observed in the toe drain weir box, which is normal. The flow was clear. The-seepage is not measured often due to confined space entry requirements. The owner continues to work to remotely measure the-seepage. The hydraulic piezometer well was dry as noted during past inspections. The dam is provided with piezometers, survey monuments, and seepage measurement devices. The latest surveillance and monitoring report was received on May 14, 2015, and the data extend through December 2014. Th-open-tube piezometer readings followed the historical trend. No unusual readings were observed and the piezometer readings are acceptable. The survey monuments readings are normal. No unusual settlement was observed. The settlement of the embankment monuments was less than 1/2-inch in the last five years. Crest Monument 0-9 at Station 18+00 has settled 0.83-inch from the design camber. Considering an operational freeboard this settlement is not a concern. The centerline survey proposed last year has not been performed yet. is planning to do a centerline survey in 2016. The horizontal deflections of the embankment monuments remain less than 1?inch since 2009, which is acceptable. The toe drain seepage was normal. The flowrates were below the threshold level of 27gpm. The seepage has not been recorded since October 2006 due to confined space entry requirements. The existing instrumentation is considered adequate and no additional instrumentation is judged necessary at this time. The dam performance is judged satisfactory, based on the available data and my observations. Sheet 2 of 4 Name of Darn Del Valle 4m No. 1-055 Date of Inspection 11/19/2015 12/13/2015 I I ?(in ?I'll-'rr-?q '3 . . . Photo 2- The glory hole and the entrance were clear and unobstructed. DWR 1261 (rev. 103'09) Sheet 3 of 4 Name of Dam DEI No. Date of InSpection 11/19/2015 12/18/2015 DWR 1261 {rem 10/09} STATE OF CALIFORNIA ALIFDRNIA NATURAL RESOURCES AGENCY OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of [3am Del Valle Dam No. 1?056 County Alameda Type of Dam Ea?b Type of Spillway Glory hole Water is 57.23: feet below spillway crest and 35.53 feet dam crest. WEE 537.47 Weather Conditions ?gmy and mild Contacts Made Dave Sarkisian. Dan Dam Safety); Rich Rodriguez, Abraham Erdom (DFD) Reason for Inspection Periodic Maintenance Inspection Important Observations. Recommendations or Actions Taken A revised Certificate of Approval was issued on July 16, 2014. matching the DSOD certified storage elevations to the seasonal flood control operations mandated by the US Corps of Engineers. The small hole noted of the toe road during the previous inspection turned out to be an abandoned animal burrow. It was backfilled earlier this year. Station markers in the COW tunnel are planned. I did not note whether a valve operation log was in place. 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 face. visible portions of the upstream face, crest road, abutment contacts, and toe area appeared to be in satisfactory structural condition with no evidence of instability or distress. Because the reservoir level was lower than normal. we decided to walk the upstream water line. No evidence of riprap breakdown or movement was noted. The crest monuments that were covered by last year?s slurry sealing were uncovered, as requested. Vegetation control was satisfactory. The small hole noted dowastream of the toe road during the previous inspection turned out to be an abandoned animal burrow. it was backfilled earlier this year. No evidence of animal activity was noted this year- Spillway The spillway approach, glory hole entrance,_ and channel were clear and unobstructed. We inspected?found the? to be in satisfactory condition. The seepage sump line was leaking some water; this will be repaired. inspected by Ly Photos taken? Yes No Date 11/5/2014 cc for Owner/Book Date of Report 12/3/2014 . .. l: we (Rev. 10:09) Sheei ?1 "or 5 INSPECTION f? -- DAM AND RESERVOIR IN CERT ED STATUS Name of Dam Del Valle Dam No. 1-056 Date of Inspection 11/5/2014 Observations and Comments Outlet The_ were inspected and found to be in generally satisfactory condition. or was reporte progressing satis actorily. The valve are cycled annually and were most recently cycled in presence on 11/6/2013 and 11/28/2012, respectively. The valves are also cycled annually. Most recently the? ere cycled in presence. Seepage I noted no signs of seepage on the face, in the abutment contacts, or along the toe. The seepage weir read 0.18ft, which is typical. Seepage was clear. The high water alarm was tested and found to be functional. The hydraulic piezometer well was dry. is working on a remote monitoring solution for measuring _seepage. seepage is not currently being measured because?is a permit-required confined space, and entry requires a rescue team to be onsite. Active instrumentation at this dam consists of survey monuments, open tube piezometers- and seepage measurements. The most recent instrumentation data submittal was received on April 23, 2014, and covers data gathered through 2013. Survey Monuments: No significant changes in the embankment behavior have been noted since the previous report. Existing movement trends are holding true with no alarming deviations. plans to have a centerline survey done to put the potential loss of camber issue to rest. Open-tube Piezometers: The_ piezometers continue to display no alarming trends. The _piezometers show more response to the reservoir than the? instruments. Seepage: Seepage remains essentially constant. Based on the submitted data, the dam is performing satisfactorily. Other than the planned open- tube piezometers in the embankment to replace the abandoned hydraulic piezometer array, no additional instrumentation is judged necessary at this time. Sheet 2 of 5 INSPECTION DAM AND RESERVOIR IN CERI ED STATUS Name of Dam Del Valle Dam No. 1-056 Date of Inspection 1 1/512014 . . - an ?MI?l-h? Photo 1: face of the embankment. 5r Photo 2: Upstream face of the embankment. DWR1261 (rev. 10/09) Sheet 3 of INSPECTION DAM AND RESERVOIR IN JED STATUS Name of Dam Del Valle _Dam No. 1:056. 11/320111 DWR 1261 (rev. 10mg) INSPECTION DAM AND RESERVOIR IN CER IED STATUS Name of Dam Del Valle_ V, Dam No. 1-056 . Date of Inspection 11/51/201 4 DWR1261 (rev. 10109) Sheet -. 5V. 0f STATE OF CALIFORNIA . .. CALIFORNIA NATURAL RESOURCES if: i ff i f? 3 DEPARTMENT OF WATER ResoURcss I L. l? oI= SAFETY oI= DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Del Valle Darn No. 1-056 County Alameda Type of Dam Earth Type ofSpillwey Glory hole Water is 57.65 feet below spillway crest and 35.55 feet below dam crest. WSE 537.35 Weather Conditions Clear and mild Contacts Made 2013 DSRB members; staff from 08M Dam Safety. DFD, Project Geology; rescue crew Reason for Inspection 2013 DSRB and periodic maintenance inspection lmEortant Observations, Recommendations or Actions Taken The in-place abandonment of the hydraulic piezometer array was approved on 9/6/2013, with the stipulation that the piezometer array be replaced with 3 piezometers in the shell to monitor the effectiveness of the chimney and blanket drains. Maintenance items: 1. DFD will investigate the small hole noted of the toe road. 2. Painted station markers in the COW tunnel would be useful for documenting problem locations. 3. An up-tondate, on-site log of all valve and gate operations is recommended. instrumentation items: 1. 08M DFD will uncover the monuments that were obscured the recent slurry sealing. 2. 08M Dam Safety will look into alternatives to measuringhseepage remotely. 3. A centerline survey would reveal if any design camber has been lost. or if it is an artifact of the survey monument location. Th_ valves ?were fully cycled with no apparent dif?culty. Conclusions From the known information and visual inspection. the dam. reservoir. and the appurtenances are judged safe for continued use. Observations and Comments Dam The face, visible portions of the upstream face, crest road. abutment contacts, and toe area were in satisfactory structural condition with no evidence of instability or distress. Vegetation control was satisfactory. I noted no rodent activity. The asphalt crest road was recently slurry sealed. which obscured several crest monuments, as well as the nearby abutment monuments in the left abutment parking area. will get these monuments uncovered. The sealant also obscured any cracking that may have occurred since the last inspection. We noted an unexplained small hole (1 foot diameter, a foot or two deep) immediately of the toe road. The field division will investigate further. J. L. Felias (DEB) Y. D. Enzler (FEB) W. A. Fraser (GB) . Inspected by ROBUWIUS allele Photos taken? Yes it No Date of Inspection 11/6/2013 cc for Owner/Book use of Report 12/18/2013 Mae/#395 DWRiasMRev.1mos) Sheet 1 of Et- DAM AND RESERVOIR IN FIED STATUS Name of Dam \Lalle Dam No. ??353 Date of Inspection_ 11/5/2013 Obse?rations and Comments Sgillway The approach, glory?hole entrance, concrete- stilling basin, and channel were in clear and unobstructed. The concrete of the Ior hole a eared to be in similar condition to previous inspections. Eac was bump tested during this inspection. They were previously each cycled 100% in December of 2012 and early summer 2013 with no obvious difficulties. Following confined space entrance protocols, we inspected of the glory hole inlet. The?appeared to be in excellent condition after the repairs made in the previous winter. A minor amount of seepage into the was noted, which is typical. Lon standing mineral deposits from seepage were also noted beginning atb There was no indication of increased seepage compared to my previous visits. Outlet The?was walked and appeared to be in similar condition to ?revious visits. Minor see a was occurrin throu various construction joints and cracks Painted station markers?would make documenting pro em oca ions muc easier. The- valve is cycled at least annually and was last cycled in DSOD's presence during the inspection of Th_valve is also cycled annually and was cycled during this inspection and the previous inspection, as well. valves are cycled annually, most recently in June 2013. The valves ere fully cycled during this inspection with no apparent difficulty. it would be useful to maintain an up-to-date, on~site log of all valve and gate movements. Seepage I noted no signs of seepage on the face, in the abutment contacts, or along the toe. The hydraulic piezometer well was dry. The seepage weir read 0.18ft, which is typical. The high seepage float alarm was tested and proved functional. Instr. instrumentation at this dam consists of survey monuments, hydraulic piezometers (abandoned), open?tube piezometers_ and seepage measurements. The most recent instrumentation report was received on March 28, 2013, and covered data gathered through December 2012. Survey Monuments: The survey monument array continues to indicate a very slow ongoing settlement of the embankment. The report notes again that the design camber may have been DWR 1261 (rev. toros) Sheet 2 of 6 IAM AND RESERVOIR IN CET FIEI STATUS Name of Dam Del Valle Dam No. 1?056 Date of Inspection 1 1/6/2013 Observations and Comments Other Sheet 3 of exceeded near the right abutment. As mentioned previously, a centerline survey of the crest would ai whether a .y camber has actually been lost or if it is an artifact of the location of the survey monument. Horizontal movement, as measured by GPS, is very small?no obvious trend was noted from the data plots. Dam Safety recommends doing conventional horizontal alignment surveys every five years; I agree with that recommendation. Hydraulic Piezomefers: The hydraulic piezometer array has been abandoned in place. Dam Safety submitted a memorandum detailing this plan on 3/12/2013. The plan was reviewed and approved on 9/6/2013, with the stipulation that the piezometer array be replaced with 3?piezometers in the shell to monitor the effectiveness of the chimney and blanket drains. Open-tube Piezomefers: No change in the behavior of the-piezometers was noted. Seepage: Seepage continues to be essentially constant. After the inspection, we discussed ways of resuming regular monitorin of the seepage. The weir has not been checked in many years because is a permit-required confined space. A remotely-monitored Parshall flume, similar to the one used at Dyer Dam, might be an option. Based on the submitted data, the embankment is performing satisfactorily. Other than replacement piezometers for the abandoned hydraulic piezometer array, no additional instrumentation is judged necessary at this time. Mr. Fraser and Ms. Enzler participated in a brief tour of the right abutment with Project Geology staff and Keith Kelson of the 2013 DSRB to view fault exposures and other items of interest related to the ongoing investigation of the right abutment fault. INSPECTIO DAM AND RESERVOIR IN CE. FIED STATUS Name of Dam Del Valle Darn No. 1-055 Data of Inspection 11/6/1201 Photo 2: Slurry seal on left abutment parking area has obscured the monuments in that location. . Sheet 4 of INSPECTIO DAM AND RESERVOIR IN CE FIED STATUS Name of Dam Del Valle Dam No. L055 Date of Inspection 1 1/6/2013 Sheet 5 of STATE or CALIFORNIA momenta NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Valle Darn No. 1?056 County Alameda Type of Bern Earth Type of SpiIIWay Glory hole Water is 4266 test below spiIIWay crest and 70.66 feet below dam crest. WSE 702.34 Weather Conditions ?Sl?t?y {and-mild Contacts Made David Sarltisian, Dan Garcia (Cloth/l Dam Safety); various staff from DOET SPH, and contractor Reason for Inspection?gillvE-yInspection 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. ObsewatRJ?nsanvd?omments Sci?vilwe We inspected the epillwey? Combined leakai was reported as approximately 15 gpm. The concrete a eared to be in good condition and there was no obvious misalignment at the joints. The?sealed well and appeared to be in satisfactory condition. The?structure appeared to be in generally satisfactory condition. The gates and stirroundirig metalwork will be recoated and new sacrificial anodes installed. The two right side gates were cycled so that Corrosion En ineering could inspect the condition of the coatin on the gate faces. The air vented all appeared to be unobstructed. The interior of the glory hole shaft appeared to be in satisfactory condition. There was minimal seepage through cracks in the concrete. Many of the cracks produced mineral stains and efflorescence. The-concrete of the glory hole also appeared to be in satisfactory condition. Many of the upstream construction joints were cracked and producing small amounts of seepage and mineral de osits. The contractor was on site working on replacing the?catwalk that was destroyed several years ago. Inspected by I taken? Yes N0 Date of Inspection 5/17/2013 ji?J?c-h?y- CC IGT Owner/Book Date of Report 6/20/2013 own 12s1 (Rev. 10/09) Sheet 1 of 3 INSPECTION OF AND RESERVOIR IN CERTIFILJ TATUS Name of Dam Del Valle Dam No. 1-055 Date of Inspection_ 5/17/2013 Photo Glor hole shaft lookin stream. DWR 1261 (rev. 10.109) Sheet 2 Of INSPECTION OF AND RESERVOIR IN .J .4 Name of Dam Valle Darn No. 1?056 Dale of Inspection DWR $251 (rev. 10:09) Sheet 3 of STATE OF CALIFORNIA CALIFORNIA NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam DEI Valle Darn No. 1-055 County Alameda Type of Dam Earth _Type of Spillway Glory hole Water is 59.86 feet below _spiilWay crest and 87.86 feet darn crest. WSE 635.14 Weather Conditions Variable, but overcast and cool - . Contacts Made Abraham Erdom, et at. (DFD) _Dave Sarkisian, Dan Garcia Dam Safety) I I Reason for Inspection Periodic Maintenance Inspection_ - Important Observations, Recommendations or Actions Taken The _chamber was flooded earlier this fall when the sumi iump failed. The chamber had been pumped out, and a crew was on site cleaning and repairing the equipment. The safety of the dam was not affected since the tor hole ortion of the spiilway remained operational. Mr. Erdom reported on 12/14/2012 that all four?gates had been successfully cycled and the structure was fully operational. My previous comment regarding a back-up method of gate operation was repeated?no action was taken during this repair because the contract did not allow for it. Tit?ewe were fully cycled in my presence with no apparent difficulties. The hydraulic piezometer array has been essentially abandoned. 08M Dam Safety will be submitting a memo explaining this change and proposing replacement instrumentation. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use. Observations and Comments The face, visible portions of the upstream face, crest road, abutment contacts, and toe area were in satisfactory structural condition with no evidence of instability or distress. Vegetation control was satisfactory with only routine brush control necessary, primarily on the upstream face. I noted no rodent activity. Sgillway The approach, glory?hole spillway entrance, stilling basin, and channel were clear and unobstructed. The stilling basin concrete appeared to be in satisfactory condition with no obvious signs of structural distress. The_ chamber was flooded earlier this fall when the seepage sum um failed. The chamber was pumped out, and a crew was on site cleaning and repairing the? equipment. The safety of the dam was not affected since the glory hole portion of the spillway remained operational. repeated my comment regarding a back up method of gate 0 oration, but DFD staff expiained that the current repair contract did not allow for redesigning Mr. Erdom re orted on 12/1412012 that all?gates had been successfully cycled and thistructure was fully operations. Inspected by R.C.Bowlus tits ,w?ms Photos taken? Yes No Date of Inspection 11/28/2012 25,: cc for Owner/Book Date of Report 1/29/2013 It], 5 I Sheet (?if INSPECTION Ci: DAM AND RESERVOIR IN nil STATUS Name of Dam Del Valle Dam No. 1-056 Date of Inspection 11/28/2012 Observations and Comments Outlet The condition of the ?Outlet_ tunnel appeared similar to my previous inspection. The concrete liner appeared to be in satisfactory condition. The condition of the coatings on the outlet pipe and associated equipment appeared satisfactory. The?valve were each fully cycled in my presence with no apparent difficulties. I noted no signs of seepage on the face, along the abutment contacts, or at the toe. Flow from the toe drain was clear. The toe weir read 0.2ft, which is typical. We did not inspect the hydraulic piezometer vault. Instrumentation at this dam consists of survey monuments, hydraulic piezometers in the embankment, open?tube piezometers? and seepage measurements. The most recent instrumentation report was received on April 3, 2012, and covered data gathered through December 31, 2011. Survey Monuments: No significant changes in the reported survey data from the previous report. I noted during the inspection that there are a few crest centerline monuments that are not reported with the rest of the instrumentation. As discussed in my previous report, a spot check of these centerline monuments could determine whether the crest settlement has actually progressed past the design camber or if the apparent exceedance is an artifact of the ?crest? monuments being located at the edge of the crest road, often well below it in elevation. Horizontal movement is now being recorded by GPS?not enough data exists to determine a movement trend yet. The report notes that the GPS horizontal movement data is ?noisier? than data from traditional surveying methods. Hydraulic Piezometers: The hydraulic piezometers are no longer being monitored because of erratic readings in some instruments and the terminal well being a confined space. Dam Safety plans to abandon the hydraulic piezometer array in place and will submit a memo explaining their reasoning and proposing replacement instruments in the embankment. Open-tube Piezomefers: The piezometers closest to the reservoi_ rise and fall with reservoir elevation changes. The right?appears to be more permeable than the left; the piezometers in the right_ still show small responses to the reservoir, whereas the instruments in the left_ are essentially flat. Seepage: Seepage has been essentially constant. Based on the submitted data report, the dam is performing satisfactorily. As noted above, new embankment piezometers will likely be necessary to replace the abandoned hydraulic piezometers. No other additional instrumentation is judged necessary at this time. I Sheet 2 of 2