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 Dam Frenchman Darn No. 1-43 County F'Iumas Type of Darn _Earth Type of SpillWay _Con_cre.t_e weir and_ channel Water is 32.23 feet below Spillway ores! and 51.23 feet below clam crest. Weather Conditions cloudy surface Elevatiomas 5581.1 feet. Contacts Matte Michael Anderson and Vanesa Morones with DWR. Reason for Inspection __F?eriodic Maintenance Inspection. lm ortant Observations Recommendations or Actions Taken he be cc cecc Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use. Observations and_Comments Dal?m The visible portion of the upstream slope was uniform and in good condition (see Photo 1). The riprap protective cover was stable, with no gaps in coverage. The slope was in good condition (see Photo 2). The rock zone on this slope was stable and uniform. The longstanding slight depression located at the lower right groin was unchanged from past reported conditions. Visual monitoring of this area should be continued. The paved crest road was level and in satisfactory condition (see Photo 3). Most of the cracks in the asphalt roadway were satisfactorily sealed. A few cracks remain, which should be sealed. The abutments were stable and the toe area was in satisfactory condition. No rodent activity was observed, and the vegetation control was satisfactory. Spillway The entrance area was clear of debris and in satisfactory condition (see Photo 4). A log-boom was in-place and was in satisfactory condition. The spillway exit channel was clear of debris, and the concrete throughout was in satisfactory condition (see Photo 5). The areas where the concrete was previously repaired/patched along the invert were holding-up well. There did not appear to be any additional areas in need of repair. The painted crack located at the left entrance wing wall appeared to be unchanged from previously reported conditions. OL'tlet ?ie out EXIT porta an energy dissi ater structure were clear of debris and in satisfactor condition. During the next escrow necc be fully cyctec in our presence. The valves reportedly performed well when they were last fully . cled__?n lur . presence on October 2. 2014 and August 22, 2013, respectively. ,?A/?fxt/Ajc? Inspected by Van Matre . ?y Photos taken? YES No Date of Inspection 9/22/16 [1.41/9 cc for Owner/Book Date ofReport 10/21/2016 My I own 1261 (Rev. totes) Shea _1 0f _5 INSPECTION JAM AND RESERVOIR IN CERTI ED STATUS Name of Dam Frenchman Dam No. 1-43 Date of Inspection 9/22/16 Observations and Comments Seepage DWR 1261 There was no visible seepage on the dam. The Toe Drain Weir had a measured head of 0.12 feet for a correlated flow of 5.28 gpm. This seepage was normal and within past limi s. T. staff decided not to install a permanent gage on this weir; measurements have been and still are taken with a folding ruler. Monitored instrumentation at this dam consists of 3 open standpipe piezometers, 9 hydraulic piezometers, 2 observation wells, 18 embankment survey monuments, 4 spillway crest survey monuments, and 1 seepage weir. The latest Dam Safety Surveillance and Monitoring Report was issued in April of 2016, and includes data that extends to December 2015. It should be noted that all of the vibrating wire piezometers failed in August of 2011 and are no longer read. Also, survey monument SM-4 located is normally under water and was not included in the latest data set. The 3 open standpipe piezometers and are located They have been monitored since 1982 an are normally read at least once a month. SP-3 has shown attenuated movements in correlation with changes in reservoir elevation. SP-4 has been steady state at approximate Elevation 5568, which means this piezometer was most likely dry throughout the data set. Due to reported erroneous data, monitoring of SP-5 was discontinued in 2009. In July 2012, the vibrating wire transducer was removed and readings continued via a dip meter. Since July 2012, SP-5 has tracked the reservoir elevation changes in a manor similar to SP-3. There were no abnormal spikes and no alarming trends in the data. The hydraulic piezometers have been monitored at least once a month since 1962. They were installed through the dam at two separate elevations The lower line of Hydraulic Piezometers (HP-1 thru HP-6) are located The upper line of Hydraulic Piezometers (HP-7 thru HP-10) are located? HP-7 was abandoned in 1991. Comparing HP-8 with HP-1 shows a pronounced drop in the phreatic surface across the chimney drain of about 50 feet. With no concerning trends or spikes in the?data set, these hydraulic piezometers indicate a normal and expected phreatic surface through the dam. The two Observation Wells OW-1 and OW-2 are located and were installed? They have been monitored at least once a month since 1982. has been steady-state throughout the data set, with periodic elevation changes apparently influenced by rainfall events. While in service from 1982 thru 2004, produced a similar data pattern when compared to OW-1. was returned to service in 2012, and has shown no indication of any variance from the previously recorded data. Since 2006, the surve monuments have been monitored at least once ever three ears. There From 1962 to 2006, the ori inal 12 crest monuments were monitored annually. The Monuments near?were added in 1968 and 1970, res ectivel . The largest total vertical settlement of 1.22?inches occurred along the? (rev. 10/09) Sheet 2 of 6 INSPECTION DAM AND RESERVOIR IN CERTI ED STATUS Name of Dam Frenchman Dam No. 1-43 Date of inspection 9/22/16 Observations and Comments DWR 1261 The lar est recent incremental vertical movement of 0.12?inches settlement occurred at Stations_ The largest total horizontal movement of 1.42?inches upstream occurred at Station - The lar est recent incremental horizontal movement of 0.16?inches upstream occurred at Stations The recorded movements were well within an expected range for an earth dam of this size. The recent centerline surveys, performed in 2009, 2011, 2013, and 2015, have indicated that there is at least Currently, 08M is evaluating this area for the necessary repairs. Located transversely along ?there are a total of 4 survey monuments. Two survey monuments are located and two survey monuments are located Survey Monument has been undenNater during most of the surveys. The lack of data from this monument is expected. The largest total and incremental vertical settlement of 0.79-inches and 0.12-inches, respectively, occurred at - The largest total and incremental horizontal movement in the direction of 4.96-inches and 0.16-inches, respectively, occurred at The horizontal movement of?is similar in magnitude, but appears to be stabilizing. The? Monument_are monitored for vertical movements only. Since 2006, they have been surveyed once every third year. Prior to 2006, these monuments were surveyed approximately once every year starting in 1981. The lar est total and incremental settlement of 0.12?inches and 0.04?inches, respectively, occurred at_ These movements are considered to be within a normal range for concrete that was placed on a good foundation. The seepage has been monitored at least once a month since 1980. The reported previous 10- year average was 12.6 (the low was 4.9 and the high was 95 gpm). There were 3 recorded spikes, which occurred in 1988, 1995, and 2006, where the seepage ranged between about 60 up to about 100 gpm. These data spikes may have been influenced by rainfall events. Outside of the 3 data spikes, the seepage data has corresponded well with reservoir elevation changes. Data from the April 2016 Dam Safety Surveillance and Monitoring Report indicates that the dam performed satisfactorily during the January 2015 thru December 2015 time frame covered in the report. The instrumentation at this site is judged satisfactory. No additional instrumentation appears to be needed at this time. it was reported that the hydraulic piezometers were last flushed in 1991. Flushing is recommended as a preventative maintenance item. 08M is considering changes to the piezometer program and will submit a report for DSOD review. The are submitted annually and the next submittal is expected by April 2017. (rev. 10/09) Sheet 3 of 6 INSPECTION C. JAM AND RESERVOIR IN CERTI. ED STATUS Name of Darn Frenchman Dam No. 1-43 Date of Inspection 9/22/16 Photo 2. A View of the slope as seen from the right toe area. DWR 1261 (rev. Sheet 4 of INSPECTION C. JAM AND RESERVOIR IN CERTI ED STATUS Name of Dam Frenchman Dam No. 1-43 Date of Inspection 9/22/16 Photo 3. A View of the crest as seen from the left abutment. Photo 4. A View of the spillway entrance area. own 1261 (rev. 10109) Sheet 5 of Name of Dam INSPECTION C. DAM AND RESERVOIR IN CERTI ED STATUS Dam No. 1?43 Date of Inspection 9/22/16 DWR 1'26?] (rev. 10;?09) Sheet 6 of OF CALIFORNIA DEPARTMENT or WATER ResoURcss DIVISION OF SAFETY or DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Frenchman Dam No. 1443 County Plumes Type of Dem cant?Tfill . _Type of Spillway Concrete weir and channel Water is 38. 4 feet below spillway crest and 57. 4 feet below_ dam crest. ws 5549. 6 Weather Conditions Clo_udyind (:ch Contacts: Vanesa Morones Kevin Wright Joe Eades and Jim Scarborough Luis Sepulveda Contacts Made Mike Anderson, Nick George, and Barbara Holbrook with DWR. Reason for Inspection Annual inspection Important Observations, Recommendations or Actions Taken As previously requested, a small staff gage should be installed within the dead pool behind the weir. The instrument suite is under review for possible changes due to the failure of all electric piezometers in 2011. This will be addressed in the 2015 DSSIVIR that will be published in the near future. The current stem is ade uate in the interim. - Tnivelve should be tested through full trevei for a cape engineer during the next inspection, or at a time convenient to Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use until the final status of the instrumentation program is resolved. Observations and Comments Elam The embankment and crest road are shown in photographs 1 through 5 and 8. The road surface was well sealed and in satisfactory condition, with the exception of a hole and depression in the pavement about 20 feet to the right of the spillway, photographs 2, 3, and 5. This condition will be investigated and repaired before the start of winter. No signs of instability were noted along the roadway or the embankment. The upstream slope was exposed to and unusually low level The rock remains in good condition. The rock slope was also In good condition. Vegetation and rodent control on the dam and abutments remains good Sgillway The crest bridge deck, approach walls, ogee crest, chute walls and floor, and the lower access bridge remain in satisfactory condition. The minor concrete repairs along the chute floor and crest remain in satisfactory condition. See photographs 5, 6, and 7. The long standing minor offsets between the chute walls bridge abutments remain stable. The documented diagonal cracking on the left spillway approach wall remains unchanged and satisfactory. The nesting material within some of the wall drains should be removed. Outlet Inspected by WPennington Photos taken? YES No Date of Inspection ?9/15/15 cc for Owner/Book Date of Report 9/21/15 I My . ,Il, Sheet I of 10 INSPECTION br' DAM AND RESERVOIR lN STATUS Name of Darn Frenchman Dali?i No. 1-43 Date of Inspection 9/1505 _Q_b__ser_vations and Comments Seegage The reservoir level was lower than usual for this time of year. The embankment and groins were dry and the toe drain flow was about the same. As previously requested, a small staff gage should be installed in the dead pool behind the v?notch weir. Seepag_was minimal and normal. The previously observed The ow remains stabe an less than 1 Regular monitoring at this location should continue. The long standing?seepage at two other locations along ?remains normal. The latest surveillance data is contained in the 2014 All of the vibrating wire piezometers failed during the 2011 calendar year. A dip meter is currently used to sound OWQ, and SP-S. The active draulic iezometers are still being monitored and the readings are taken in the Based on the information in the 2014 the phreatic surface appears to be normal and satisfactory. Vertical and horizontal movements have stabilized and remain normal. A revised plan for the instrumentation program is still under development and will be discussed in the upcoming 2015 The current suite of instruments is acceptable until then. Based on my field inspection and a review of the available instrument data, the dam appears to be functioning satisfactorily. owe 1261 {rev ioros} Sheet 2 of 10 INSPECTION Ur? DAM AND RESERVOIR IN CERTII-IED STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 9115/1 5 I. This View from the right abutment shows the beached spillway buOy line and the left spillway training wall. The long standing diagonal cracks in the training wall were tight and not offset. The rock wave protection remains sound and stable appearing. The crest road was well sealed and in satisfactOry condition, except for a small hole and depression at the right abutment. See photograph 2. DWR 1251 (rev. 10:09) Sheet 3 of 10 INSPECTION OF DAM AND RESERVOIR IN CERTII-IED STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 9/15/15 2. A small hole and depression were observed at the arrow. The hole will be investigated and repaired before Winter arrives. Also see photograph 3. 3. This is a close up view of the hole shown in photograph 3. The hole appeared to extend laterally across the roadway surface. The crest alignment is in the direction ofthe arrow. DWR1261 (rev,10l09) Sheet A Of A INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Frenchman Dam No. 1-43 Date of Inspection 9/15/15 4. This View looking towards the right abutment Shows the well?sealed crest road, the good condition of the slepe is evident. DWR1261(rev.10f09) Sheet 5 of 10 INSPECTION OF DAM AND RESERVOIR IN STATUS Name ofDam Frenchman Darn No. 1-43 Date of Inspection 9/15/15 5. The Spillway approach, training wall, and ogee crest structure remain in good condition. The pavement hole shown in photographs 2 and 3 is at the arrow. This is just within the outer section of the fill. 6. This View down the spillway alignment shows the light colored concrete patches. The walls and chute ?oor remain stable appearing and in good condition. The minor vertical cracks along the walls remain tight and were not offset. The nests in some of the wall drains should be removed. DWR1261 Sheet of A INSPECTION OF DAM AND RESERVOIR IN CERTII-IED STATUS Name of Dam Dam No. 1-43 Date of Inspection 5 7. The lower SpiIIway bridge and ?ip buckcl were in good condition. DWR 1251 (rev. 10:09) Sheet 7 of INSPECTION UF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Frenchr'nar] Darn No. 1.43, Date of Inspection 9/15/15 DWR 1:251 (rev. 10109} Sheet INSPECTION Ur? DAM AND RESERVOIR IN CERTIHED STATUS Name of Dam ?Frenchman Dam No. Date of Inspection 5 DWR 125-: Sheet 9 of 10 INSPECTION OF DAM AND RESERVOIR IN CERTIHED STATUS Name ofDarr?y Frenchman Dam Na 1.3% Date of Inspection DWR 1'26"! [rev STATE OF CALIFORNIA ALIFORNIA NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIED STATUS Name of Dam Frenchman Dam No. 1-43 County Plumas Type of Dam earthfill Type of Spillway Concrete weir and channel Water is 30 feet below spillway crest and 49 feet below dam crest. ws 5558 Weather Conditions Sunny and mild Primary contacts: David Sarkisian, Vanesa Morones, Kevin Wright, Joe Eades, John Rizzardo, Contacts Made and Jim Scarborough with DWR. Reason for Inspection Annual Inspection Imgortant Observations, Recommendations or Actions Taken the result of the May 23, 2013 Mw 5.7 earthquake that occurred about 50.5 miles northwest of Frenchman Dam. No action other than'routing monitoring is recommended at this time. . As previousli reiuested, a small staff should be installed within the dead iool behind the weir. The instrumented and visual monitoring program is currently being reviewed for possible changes due to the failure of all electric piezometers in 2011. Th valve?was fully cycled during the inspection. The - was successfully tested for DSOD during the 2013 inspection. Conclusions From the known information and visual inspection, the dam, reservoir, and the appurtenances are judged safe for continued use until a revised instrumentation program is implemented. Observations and Comments Dam The embankment and crest road are shown in photographs 1, 2, 3, and 4. No signs of instability were noted along the crest road or embankment. Vegetation and rodent control remain good. The upstream wave protection was stable and the rock remains sound. The occasional rock breakdown is not significant. Rock along the slope was in good condition. The small, previously observed depression in the rock at the lower right groin was unchanged. Sgillway The crest bridge deck, approach walls, ogee crest, chute walls and floor, and the lower access bridge remain in satisfactory condition. The minor concrete repairs along the chute floor and crest remain in satisfactory cogdition. See photographs 1, 2, 5, and 6. The previously noted minor offsets between the chute walls at the edge of the bridge abutments remain stable. The documented diagonal cracking on the left spillway approach wa remains unchanged, photographs 2 and 5. Outlet Inspected by WPennington Photos taken? Yes N0 Date of Inspection 10/2/14 cc for Owner/Book Date of Report A In)? DWR 1261 (Rev. 10/09) 1 sz? INSPECTICN DAM AN. RESERVQIR IN CERT I STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 10/2/14 Observations and Comments valve was fully cycled - The _valve was operated through full travel for a DSOD engineer during the 2013 inspection and is regularly operated throughout the season. No action other than ?monitoring is recommended at this time. Seepage The reservoir level was lower than usual for this time of year. The embankment and groins were dry and the toe drain flow was normal. As previously requested, a small staff gage should be installed in the dead pool behind the v-notch weir. 3151:. The latest surveillance data is contained in the 2013 All of the vibrating wire piezometers failed during the 2011 calendar year. A dip meter is currently used to sound OW-1, OW-2, and SP-5. The active hydraulic piezometers are still being monitored. Based on the information in the 2013 the phreatic surface appears to be normal and satisfactory. Vertical and horizontal movements have stabilized and remain normal. A revised plan for the instrumentation program is under development. The current suite of instruments is adequate until a revised program is completed by and reviewed by DSOD. Based on my field inspection and a review of the available instrument data, the dam appears to be functioning satisfactorily. Sheet 2 of 8 INSPECTION DAM AND RESERVOIR IN CERT ED STATUS Name ofDam Frenchman Dam No_ 1-43 Date of Inspection 10/2/14 1. The aSphalt cracks remain well sealed in this View looking east along the spillway bridge deck and dam crest road. 2. The rock along the upstream remains stable and sound. The spillway apron and left training wall are in the foreground. The long standing crack in the left training wall remains stable, arrow. Sheet 3 of 8 INSPECTION DAM AND RESERVOIR IN CERT ED STATUS NameofDam Freaghman 7 . Dam No. 1-43 Date of Inspection 10/2/14 3. 'I?hc right was stable appearing and thc: rock slope material was sound. - DWR1261 (re-v.10l09) Sheet _4 of INSPECTION 3AM AND RESERVOIR IN CERT ED STATUS Name of Dam Frenchman Darn No. 1-43 Date of Inspection '1 0/2/14 5. This View of the spillway shows the approach apron in the foreground. The training walls, bridge abutments, and ogee crest structure remain stable and in satisfactory condition. An old Crack that has been painted for monitoring purposes is at the arrow. The crack remains stable. 6. The spillway chute was stable and in satisfactory condition. Concrete patches are visible along the chute floor. The patches are performing well. Dave Sarkisian is examining a wall drain. DWR1261 (rev. 10109) Sheet i of i INSPECTION I DAM AND RESERVOIR IN CERT ED STATUS Name of Dam Fre 0913]}? Dam No. 1-43 Date of Inspection__ 10/2/14 DWR 1261 (rev. IOEOQI INSPECTION 3AM AND RESERVOIR IN CERT ED STATUS Name of Dam [jam No. Date of Inspection 10/2/14- DWF: 125-1 (rev. 10:09} Sheet 0! DAM AND RESERVOIR HN CERT ED STATUS Name ofDam _F_[Em_c_h_lj1_an _DamNo. i? Date of Inspection__ Sheet 8 of 8 STATE OF CALIFORNIA CALIFORNIA NATURAL RESOURCES AGENCY DEPARTMENT OF WATER RESOURCES DIVISION OF SAFETY OF DAMS INSPECTION OF DAM AND RESERVOIR IN CERTIFIE STATUS Name of Dam Frenchman Dam No. 1-43 County Plumas Type of Dam earthfill Type of Spillway Concrete weir and channel Water is 20 feet below spillway crest and 39 feet below dam crest. WS 5568 Weather Conditions Sunny, breeze Primary contacts: David Sarkisian, Vanesa Morones, Kevin Wright, Joe Eades, Amber Orlof, Contacts Made Kevin Wright,and Jim Scarborough with DWR. Reason for Inspection Annual Inspection Important Observations, Recommendations or Actions Taken As previousli reiuested, a small staff should be installed within the dead iool behind the weir. . The instrumented and visual monitoring program is currently under review . 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 embankment and crest road are shown in photographs 1 through 5. No signs of instability were noted along the recently sealed crest road or along the embankment. Vegetation and rodent control remain good. The upstream wave protection was stable and the rock remains sound, except for very occasional rock breakdown due to weathering. Rock along the slope was in good condition. The small, previously observed depression in the rock at the lower right groin was unchanged. Spillway The crest bridge deck, approach walls, ogee crest, chute walls and floor, and the lower access bridge remain in satisfactory condition. See photographs 6 through 9. The previously noted slight offsets between the chute walls and the bridge abutments appeared to be stable and have not moved significantly in many years. The documented diagonal cracking on the left spillway approach wall remains unchanged. The minor concrete repairs along the chute floor and crest remain in satisfactory condition. Outlet . 9 Inspected by WPennington . Photos taken? Yes No Date of Inspection 8/22/13 cc for Owner/Book Date of Report 10/3/13 lat: 10/31/53 DWR 1261 (Rev. 10/09) Sheet INSPECTION QF DAM AND RESERVOIR IN CERTI. .EI STATUS NameofDam Frenchman Dam No. 1-43 Date of Inspection 8/22/13 Observations and Comments Th as traversed The ?appeared to be operating properly. Photograph 10 shows typical conditions The?remains clean and well maintained. Th open. Photograph 12. The?valve and_ valve were fully cycled and functioned satisfactorily. Conditions remain normal for this dam. The embankment and groins were dry. The toe drain flow was normal. As previously requested, a small staff gage should be installed in the dead pool behind the v-notch weir. Seepage The flow, first noted in 2011, appeared to be about the same as noted in recent reports. This location should be monitored as has been done in the past. The latest surveillance data is contained in the 2012 All of the vibrating wire piezometers failed during the 2011 calendar year. . A dip meter is currently used to sound and SP-5. During the inspection, vibrating wire piezometer 4 was removed. In the future, this hole will be sounded with a dip meter. The active hydraulic piezometers are still being monitored. Photograph 14. Based on the information in the 2012 the phreatic surface appears to be normal and satisfactory. Vertical and horizontal movements have stabilized and remain normal. A revised plan for the instrumentation is under development. The current suite of instruments is adequate until a review of the program is completed by 08M and reviewed by DSOD. Based on my field inspection and a review of the available instrument data, the dam appears to be functioning satisfactorily. Sheet 2 of 12 INSPECTION Ol- DAM AND RESERVOIR IN CERTI. .150 STATUS NameofDam Frenchman Dam Na 1.43 Date of Inspection 3/22/13 1. The rock along the upstream slope was sound and well distributed. The crest road cracks remain sealed. rm- 2. This View of the upstream slope also shows the spillway approach apron at the far right. The normal water surface is evident by the change from dark to light rock. DWR1261 (rev. 10:09) Sheet i of i INSPECTION Ol- DAM AND RESERVOIR IN CERTI. .ED STATUS NameofDam Frenchman Dam No. 1-43 Date of Inspection 8122/1 3 3. This View of the slope shows the heavy rock armor along the lower slope and the conditions along the right abutment contact. The long standing small depressions in the riprap in the vicinity of the arrow appeared to be unchanged. 4. The left side of the slope and left abutment contact are shown. Conditions appeared to be normal along both abutments. owmzm (rev.10f09) Sheet Of A INSPECTION Or DAM AND RESERVOIR IN CERTI: .ED STATUS NameofDam Frenchman Dam No. 1-43 Date of Inspection 8/22/13 5. This View looking from the darn crest? Seepage at the weir was normal. 6. Conditions along the spillway chute appeared to be normal. No signi?cant concrete deterioration or signs of instability were observed. Small, light colored concrete patches are visible along the chute ?oor. The patches remain intact. Sheet 5 of 12 INSPECTION OI- DAM AND RESERVOIR IN CERTII .ED STATUS Name of Dam Frenchman Dam No. 1-43 Date of Inspection 8/22/13 'd 7. The drain channel along the right side of the spillway contained rock rubble. This material should be cleared from time to time to keep runoff within the ditch. Sheet 6 of 12 i INSPECTION DAM AND RESERVOIR IN CERTI. .c'D STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 3122/1 3 8. The left side of spillway contact was satisfactory, but should be checked for erosion in the unprotected areas. Sheet 7 of 12 INSPECTION OF DAM AND RESERVOIR IN CERTII .ED STATUS Name of Darn Frenchman Dem No. 1-43 Date of Inspection 8/22/13 9. The spillway ?ip bucket transition curve starts beneath the lower bridge crossing. The drain at right should be kept clear of debris so that the ?ip bucket drain functions normally. owa1251 (rev. 10:09) Sheet 8 of 12 INSPECTICN OF DAM AND RESERVCIR IN STATUS Name ofDam Frenchman Dam No 1-43 Date of Inspection 8/22/13 Sheet 9 of 12 INSPECTION DAM AND RESERVOIR IN CERTI: .ED STATUS Nam: oi Dam Frenchman Dam Nn. 1-43 Date ?ll/1:3 DWR 125'? (rev. INSPECTION DAM AND RESERVOIR IN CERTII STATUS Nauru; CIfDa-my .. Dam No. 1-43 Dale of Inspecliun_ . (rev. 10:09) Sheet IL INSPECTION OI- DAM AND RESERVOIR IN IED STATUS Name of Dam French_n_1?rl_ 7 Darn No. 1-43 Dale of Inspection 3/22/13 Sheet 12_ of 12 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 Frenchman Darn No. 1-43 County Plumas Type of Darn earthfill Type of Spillway Concrete weir and channel Water is 16 feet below spillway crest and 35 feet below dam crest. ws ~5572 feet Weather Conditions Sunny and Primary contacts: David Sarkisian, Vanesa Morones, Kevin Wright, and Jim Scarborough with Contacts Made DWR. DSRB members: Bill Rettberg, Lelio Mejia, Keith Keison Reason for Inspection Annual Inspection Important Observations, Recommendations or Actions Taken 0 This inspection was completed in conjunction with the 2012 Director?s Safety Review Board site visit. . As previously requested, a small staff gage should be installed within the dead pool behind the weir. . The instrumented an! visuaI monitoring program IS currentIy un!er rev1ew!y an! may !e revised following the PFMA to be conducted in November 2012. 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 embankment and crest road are shown in photographs 1 through 7. No signs of instability were noted along the recently sealed asphalt crest road or the embankment. Vegetation and rodent control remain good. The upstream wave protection was stable and the rock remains sound, except for very occasional rock breakdown due to weathering. Rock along the slope was in good condition. The small, previously observed depression at the lower right groin rock was unchanged. Spillway The crest bridge deck, approach walls, ogee crest, chute walls and floor, and the lower access bridge remain in satisfactory condition. See photographs 7 through 13. The slight offsets between the chute walls and the bridge abutments appeared to be stable. See photographs 9 and 10. The previously documented diagonal cracking on the left spillway approach wall remains unchanged. See photograph 11. The minor concrete repairs along the chute floor and crest remain in satisfactory condition. See photographs 12 and 13. Outlet The outlet system consists of an un-gated concrete intake tower; a concrete encased 36-inch steel? lined conduit from the intake tower to the gate chamber; and a coated 30-inch, cradle supported, steel pipe within a 6.5-foot-high concrete horseshoe tunnel that extends from the gate chamber to the operating house. An 8-inch bypass globe valve is used for stream maintenance flow. A 24-inch H-B discharge valve provides the majority of the drawdown capacity. The was traversed The appeared to be operating properly. The?was clean and . TIE valve was fully open and appeared to be well maintained. . inspected by WPennington 1 Photos taken? Yes N0 Date of Inspection 9/25/12 IVV I 1% CC for owner/BOOK Date of Report 10/26/12 I DWR 1261 (Rev. 10/09) INSPECTION DAM AND RESERVOIR IN TED STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 9/25/12 Observations and Comments Seepage The concrete surface?remain in good condition. See photograph 17, for example. The ?was clean and in satisfactory condition. Conditions remain normal for this dam. The embankment and groins were dry. The toe drain flow was normal. As previously requested, a small staff gage should be installed in the dead pool behind the v?notch weir. See a was minimal and normal.? a eared to be about the same as noted in recent reports. The site shoul monitore has chosen the FERC format to record and evaluate surveillance data. The latest report is the 2011 All of the vibrating wire piezometers failed during the 2011 calendar year. The vibrating wire probes in OW-1, and SP-5 have been removed, and readings are reportedly being made using a dip meter. The active hydraulic piezometers are still being monitored. Based on the limited information, the phreatic surface appears to be normal for this dam. Vertical and horizontal movements have stabilized and remain normal. The instrumented and visual monitoring program is currently under review by and may be revised following the PFMA to be conducted in November 2012. The current suite of instruments is adequate in' the interim, but may be supplemented following completion of the PFMA and formal comments by the DSRB. Based on my field inspection and a review of the available instrument data, the dam appears to be functioning satisfactorily. Sheet 2 of .11 INSPECTION DAM AND RESERVOIR IN CERT ZED STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 9/25/12 1. The upstream slope looked stable, and the rock wave protection was sound, with the exception of occasional rock breakdown. 2. This View of the upstream slope shows the beached buoy line and the spillway approach. Frenchman Dam, No. 1?43 Plumas County WPennington 9/25/ 12 Sheet 3 of 11 INSPECTION L. DAM AND RESERVOIR IN CERT Name of Dam FrenChman Date of 4. This view of the slope shows a stable appearing embankm rock. DWR 1261 (rev, 1 01'09) STATUS Dam No. 1-43 Inspection 9125/1 2 ent and the good condition of the Frenchman Dam, No. 1-43 Plumas County WPennington 9/25/12 Sheet 4 of '11 INSPECTION N..- DAM AND RESERVOIR IN STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 9/25/42* (LI ?wJ' 5. The right groin ol' the darn was dry, stable appearing, and in satisfactory condition. The slight rock depression at the arrow appeared to be unchanged from past inspections. Dam, No. 1-43 Plumas County 9/25/12 Sheet 5 of 11 DWR 1261 (rev. 10r?09) INSPECTION L. DAM AND RESERVOIR IN CERT STATUS Name ofDam Frenchman Darn No. 1-43 Date of Inspection 9/25/12 7. The spillway bridge was observed from above and below. No signs of distress were observed. I 8. The spillway approach walls remain in satisfactory condition. The left approach wall has long standing diagonal cracks that remain tight and stable. Frenchman Darn, No. 1-43 Plumas County WPennington 9/25/12 {rev.'10f09) Sheet A Of A. INSPECTION L. DAM AND RESERVOIR IN CERT STATUS NameefDam Frenchman Dam No. 1-43 Date of Inspection 9/25/12 10. A slight inward offset between the right bridge abutment and the chute wall was also stable. Frenchman Dam, No. 1?43 Plumes County WPenningtOIl 9/25/12 DWR1261(rev.10f09) Sheet 7 of 11 INSPECTION . DAM AND RESERVOIR IN CERT STATUS NameofDam Frenchman Dam No. 1-43 Date of Inspection 9/25/12 II. The diagonal cracks at the left spillway training wall remain stable. See arrows. Frenchman Dam, No. 1-43 Plumas County WPennington 9/25! 12 DWR 1261 (rev. Sheet 3 Of 11 INSPECTION L- DAM AND RESERVOIR IN CERT STATUS Name ofDam Frenchman Dam No. 1-43 Date of Inspection 9/25/12 12. The chute walls and ?oor remain stable and in satisfactory condition. The light colored chute ?oor patches remain in good condition. Some loss of Concrete paste was observed along the chute ?oor. 13. This looking upstream at the ogee crest shows some of the concrete patches that were completed a few years ago. The good condition along the underside of the crest bridge deck is also shown. Frenchman Dam, No. 1-43 Plumas County WPennington 9/25/12 DWR 1261 (rev. 10.109) Sheet 9 of '11 INSPECTION DAM AND RESERVOIR IN CERT STATUS Name of Darn 7 7 Dam No, 1-43 Date _Qg5/12 Dam, No. 1-43 Plumas Emu-1t)? Sheet '10 of INSPECTION DAM AND RESERVOIR IN CERT ED STATUS Name of Dam Dam NO. 1-43 Date of Inspection_ 9/25/12 1-?1?el1chman Dam, N0. L43 I?lumus (301.1111): Wl?cnnington 0/3 I 2? 3 DWR 125-1 new. -1 0:09} Sheet 1 1