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812111812111 151181.. 1111111811 8.1

 OF DAM AND RESERVOIR IN GER: . STATUS

NameofDam Camanche Dam No. 31?16

 

 

Date of inspection 5/31/2017

 

Observations and Comments

 

Sgillway

Outlet

Seepage

3
(D
H-
T1

DWR 1261 (rev. 10/09) Sheet 2 of 7

 

The spillway approach, control section, and channel remain clear and unobstructed.
The concrete apron, control weir, chute and side walls are all free of vegetation and remain in good
condition, with no significant cracking or spalling. Concrete panels are well-aligned and panel joints
are in good condition. Weep holes are kept clear.

The outlet tunnels were not inspected due to time constraints. All outlet valves and appurtenances
visible in the above-ground valve house appeared to be well maintained and in good operating
condition. The control valves were last cycled in
presence on 2/2/2012 and 4/2/2015, respectively. All outlet control valves were most
recently cycled by the owner during the 2016 outage.

As noted in the previous report, the valves were due to be cycled in 
presence during the 2016 inspection, but the District was unable to do so because of a broken pipe.
I agreed the cycling of these valves could be done in 2017, and during the inspection lVlr. Rowan
informed me the valves will be cycled during an upcoming outage on June 14, 2017?.
agreed to make every effort to attend this operation.

Per our August 30, 2016 letter reducing the frequency of conduit inspections, the next inspections
of the north and south conduits must be completed by 2024 and 2027, respectively.

The left abutment drainage edit at the toe of the main dam was flowing at approximately ~7 gpm.
Flow through the toe drain system in the field below the main dam was estimated at ~100 gpm.
Flow collected from the relief wells along the toe of the main dam was ~152 gpm. These flows all
fall within the normal range for the reservoir elevation and time of year.

Dike #1 remains in good condition with no signs of seepage on the face, groins, or toe
of the embankment.

Dike #2 remains in good condition, and the face, groins, and toe of the embankment
were dry, as usual, with the exception of a small trickle of seepage at the toe of the dike between
relief wells #6 and This trickle has not been commented on in previous reports because prior to
last year, all relief wells discharged directly onto the ground, masking this seep. The trickle was no
more than 1 gpm, and flow was clear. All the uplift relief wells were trickling or flowing as normal.
Flume D2-1 (left) measures flow from all relief wells, and was flowing at ~40 gpm. Flume D2-2
(right) measures flew from the French drain system, and was flowing at ~22 gpm. These ?ows are
within the normal range for the reservoir elevation and time of year. i

 

Bikes #5 and #6 were mostly above water on this date. The normal artesian flow was noted
at several points along the toe of dike and appeared unchanged. All other dikes were dry.

Seepage conditions at all embankments were judged to be normal. 

Instrumentation at this dam consists of 139 piezometers and open wells, 38 survey monuments, 
and 28 seepage monitoring points. The most recent surveillance data and summary was submitted
with an owner?s letter dated May 31, 2017, and includes data through December 31, 2016.

Piezometers and Open Wei/s: in 2016, piezometers and open wells generally read abou-
higher than their normal maximum levels, due to increasing rainfall and higher reservoir elevations.
The piezometers below the toe of the main dam all appear to be tracking changes to the reservoir

elevation, with the exception of piezometer MD-10A, which rose steeply following many years of

 

INSPECTIQN OF DAM AND RESERVOHR IN . STATUS

NameofDam Camanche Darn No. 31-16

 

 

Date of Inspection 5/31/2017

 

Observations and Comments

 

gradual increases. This piezometer became pressurized after it was flushed in 2015, and has not
yet recovered; the District continues to monitor this piezometer closely. All other piezometers at the
main dam and the main dam abutments behaved normally during the reporting-period. The rising
trend previously noted at piezometer has since normalized.

All piezometers at dike #1 and dike #2 behaved normally, rising from the historic lows of 2014 and
2015, fluctuating gently with the increasing reservoir levels. The rising trends previously noted at
piezometers and D2-31 during the past several years appear to have
normalized following flushing in 2015.

The phreatic surface indicated by piezometer readings at the main dam and at dikes #1 and #2
appears to be normal compared to previous years, if a bit higher due to increased rainfall and
higher reservoir levels. There are no concerning trends in the piezometer data for 2016.

Survey Monuments: Survey data at the Main Dam, Dike 1, and Dike 2 is obtained quarterly for
vertical and horizontal components. Maximum recorded vertical movement since the previous year
was a settlement 0- near the maximum section of the main dam. Maximum recorded
settlement between 1993 and 2016 for all surveyed monuments remains less ther-
Maximum recorded horizontal movement since the previous year wa- in the 
direction near the maximum section of dike Maximum horizontal movement between 1993 and
2016 for all surveyed monuments remains less thar_ in either direction. This is acceptable
movement for a large dam or a mid-sized earthfill dike. There are no irregularities or
anomalies in the survey data which indicated any safety concerns.

 

Seegage Points: Seepage readings increased in 2016, due to increased rainfall and higher
reservoir elevations. The sump in the field below the main dam peaked at ~162 gpm.
The relief well system at the toe of the main dam peaked at ~138 gpm. The relief well system
below dike #2 peaked at ~44 gpm. The French drain system below dike #2 peaked at ~10 re~
included gpm. Seepage at Bikes 3, 4, 5, and 6 was negligible. There are no irregularities or
anomalies in the seepage data which indicate any dam safety concerns.

The available data indicates the dam continues to perform satisfactorily. The current
instrumentation network is judged to be acceptable, and no new instrumentation is deemed
necessary at this time.

 

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13111-111 126:1 (1111:. "11111191 Sheet ?1 1.11- .- 

INSPECTION or DAM AND RESERVOIR IN STATUS

NameofDam Camanche Dam No. 31?16

 

 

Date of inspection 13/30/201 6

 

Observations and Comments

 

Spillway

Outlet

Seepage



 

The spillway approach, control section, and channel remain clear and unobstructed.
The concrete apron, control weir, chute and side walls are all free of vegetation and remain in good
condition, with no significant cracking or spalling. Concrete panels are well?aligned and panel joints
are in good condition. Weep holes are kept clear. 

The outlet tunnels were inspected and found to be in good condition. The tunneis are nearly dry,
and the pipe coatings remain in good condition. All outlet valves and appurtenances appeared to
be well?maintained and in good operating condition. The control valves

were last cycled in presence on 2/2/2012 and 4/2/2015, respectively.
All outlet control valves were most recently cycled by the owner during the 2015 outage.

The valves were due to be cycled in presence during this inspection, but
the District was unable to do so on this date because of a broken pipe. I agreed the cycling of
these valves couid be done in 2017. 

The left abutment drainage edit at the toe of the main dam was flowing at approximately ~4 gpm.
Flow through the drainage field at the toe ofthe main dam was estimated at ~2 gpm. Flow from the
numerous relief wells along the toe of the main dam was about ~138 gpm. These flows all fall
within the normal range for the reservoir elevation.

Dike #1 remains in good condition with no signs of seepage on the face, groins, or toe
of the embankment.

Dike #2 remains in good condition, and the face, groins, and toe of the embankment
were dry, as usual. The uplift relief weils were trickling or flowing as normal. Flume 92-1 (left)
measures fiow from all relief wells, and was flowing at ~45 gpm. Flume (right) measures flow
from the French drain system, and was flowing at ~40 gpm. These flows are within the normal
range for the reservoir elevation.

Bikes #5 and #6 were mostly above water on this date. The normal artesian flow was noted
at several points along the toe of dike and appeared unchanged.

Seepage conditions at all embankments were judged to be normal.

Instrumentation at this dam consists of 222 piezometers and open wells, 38 survey monuments,
and 28 seepage monitoring points, but 92 instruments were proposed for exclusion from future
instrumentation reports in the owner's May 6, 2016 letter, and these instruments were not included
in this year?s submittai. in our reply letter dated August 30, 2016, we approved the majority of
these instruments for exclusion, but we requested the nine instruments be re-included in future
submittals. The most recent surveillance data and summary was submitted with an owner?s letter
dated May 27', 2016, and covers the period from November 1, 2014 through December 31, 2015.

Piezometers and Open Wells Several piezometers logged record low readings in 2014/2015 as
drought conditions persisted, but this is to be expected at lower reservoir stages. The rising trends
noted at piezometer (main dam) and also at piezometers and D2-31B
(dike during the 2011 and 2012 inepections have completely reversed, and these piezometers
are now failing below their historic ranges. The phreatic surface indicated by piezometer readings
at the main dam and at dikes #1 and #2 is even lower than the previous year, due to
declining reservoir levels. There are no concerning trends in the piezometer data for 2015.

Sheet 2 of 7

 

 

 

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TEST (Rev TWQQ) I 81-1581; {3f

 

INSPECTION Qt- DAM AND RESERVOIR IN CERTTFIED STATUS

Name of Dam Camanche Dam No. 31?1 6

 

 

Date of Inspection 4/ 2/201 5

 

Observations and Comments 

 

Sgillway

Outlet

Seepage

 

 

Rodent bait stations were set, and rodent activity was minimal.

Auxiliary dikes and #6 were all completely above water. All embankments were in
satisfactory condition and showed no sign of instability or distress. The gravel crests were straight,
level, and in good condition. Rock cover on the upstream faces was stable and uniform, and rip rap
on the faces was adequate, if somewhat thin in spots due to cattle walking on the face
of the embankment. Vegetation control was satisfactory. Rodent bait stations were set, but there
was no visible rodent activity.

The spillway approach, control section, and channel remain clear and unobstructed.
The concrete apron, control weir, chute and side walls are free of vegetation and appear to be in
good condition, with no signs of cracking or spelling on the concrete surfaces. Concrete panels are
well?aligned and panel joints are in good condition.

The outlet tunnel and conduit were inspected on 2/26/2015, and are covered in the
inspection report dated 4/1/2015.

The? valve was cycled closed for the penstock inspection, and will
be cycled open again when normal operations resume. The two valves
were fully cycled during this inspection and operated without any problems.

The ieft abutment drainage edit at the toe ofthe main dam was flowing at approximately ~2 gpm.
Flow through the drainage field at the toe of the main darn was measured at ~1/4 gpm. Flow from
the relief welis at the toe of the main dam was about ~90 gpm. These flows are much lower than
normal, but are not concerning given the very low reservoir elevation.

Dike #1 remains in good condition with no signs of seepage on the face, groins, ortoe
of the embankment. -

Dike #2 remains in good condition with no signs of seepage on the face or groins of
the embankment. Several of the relief wells along the toe of the dike were trickling or
flowing as normal. Each relief well along the toe has been recently fitted with a new seepage
measurement flume, and two additional seepage flumes have been added further in
separate vaults. Flume D2-1 (left) measures flow from all relief wells, and was flowing at ~5 gpm.
Flume (right) measures flow from the French drain system, and was flowing at ~10 gpm.

Bikes #5 and #6 were above water on this date. The normal artesian fiow was noted at
several points along the toe of dike and appeared unchanged.

These conditions match those observed at the dam during previous maintenance inspections with
the reservoir at very low elevations. Seepage conditions were judged to be normal.

instrumentation at this dam consists of 191 piezometers, 9 open wells, 49 survey monuments and
28 seepage monitoring points. The most recent surveillance data and summary was submitted with
an owner?s letter dated February 27, 2015, and covers the period from November 1, 2013 through
October 31, 2014.

Piezometers and Open Wells With very few exceptions, piezometer levels decreased across the
board in 2013/2014 as drought conditions persisted and the reservoir elevation steadily decreased.
The increasing trends noted at piezometer (main dam) and also at piezometers 

Sheet 2 of 9

 

INSPECTION Or DAM AND RESERVOIR iN STATUS

Name ofDam Camanche Dam 31?16

 

Date of Inspection 4/2/2015

Observations and Comments

DZ-ZSB, and D2-31B (dike during previous inspections have stabilized or decreased, returning
to their historic ranges. The phreatic surface indicated by piezometer readings at the main dam
and at auxiliary dikes #1 and #2 is lower than last year, as expected.

Piezometer at the toe of the main dam and piezometer at the far left toe of dike #2
continue to show a slight rising trend regardless of the declining reservoir elevation. The owner will
attempt to flush and clean these and several other piezometers during the 2015 year, and needs to
Specifically address them in the next instrumentation submittal.

Monuments Survey data at the Main Dam, Dike 1, and Dike 2 is obtained quarterly for vertical
and horizontal components. Maximum recorded vertical movement since the previous year was a
settlement 0- near the maximum section of the main darn. Maximum recorded settlement
between 1993 and 2014 for all surveyed monuments has remained less thar? Maximum
horizontal movement since the previous year was an upstream shift 0- near the right side
of dike Maximum horizontal movement between 1993 and 2014 for all surveyed monuments
has been less thar? This is reasonable movement for a large earthfill dam or a mid-sized
earthfill dike. I found no irregularities or anomalies in. the survey data which indicated any problems
or dam safety concerns.

Seepage Seepage readings declined again in 2013/2014, due to continuing drought conditions
and lower reservoir levels. Several new all-time low flows were recorded at the main dam and at
dikes #1 and #2 this year. In 2013/2014, the relief well system at the toe of the main dam had a low
reading of 75 gpm, whiie the normal low flow is 100 gpm. ln 2013/2014, the two drains below dike
#2 had low readings of 3.8 and 12.6 gpm, respectively, while normal low flows for these drains are
20 and 50 gpm, respectively. Fiow from the relief wells at the toe of dike #2 dropped to 5 gpm,
while normal low flow is 40 gpm.

As noted in the body of this report, severai new seepage measurement fiumes have been added to
the individual relief wells and the French drain system at the toe of dike Instrumentation data is
being collected for these new instruments and will appear in future submittals.

Seepage at Dikes 3, 4, 5, and 6 was reported by the owner as negligible. i found no irregularities
or anomalies in the seepage data which indicate any problems or dam safety concerns.

The current instrumentation network is found to be adequate. No new instrumentation is deemed
necessary at this time.

 

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INSPECTION i DAM AND lN ED STATUS

Name of Dam Camanche Dam No. 31-15

 

 

Date of Inspection 2/26/2015

 

Observations and Comments
to cycle these valves for us prior to re-pressurizing the conduit.

Afterthe inspection, discussed outlet valve cycling requirements with Mr. Rowan.
Typically, DSOD requires that all outlet controls be cycled annually and in our presence every three
years. However, because of strict power generation requirements and even stricter 
restrictions at this dam, precedent has been established where the upstream and 
valves are only fully cycled when their respective penstocks are dewatered every four years, and
they are partially cycled annually on other years. told Mr. Rowan this arrangement is acceptable,
provided the schedule is adhered to. The valves will be cycled this year, as noted
above. The valves were last fully cycled in our presence on 2/2/2012, and are due
to be cycled again in 2016.

We also discussed the inspection frequency for the interior of the penstock conduits. i told Mr.
Rowan a twelve?year frequency is acceptable given the excellent condition of the conduits. The
conduit was last inspected on 2/2/2012, and is due to be inspected again in 2024.
The_ conduit is due to be inspected again in 2027.

 

 

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AWE 3:261 16:39.) SAGE 7 

 DAM AND RESERVOIR lN IED STATUS

Name of Dam Camanche Dam No. 31-16 .

 

 

Date of Inspection 3/27/2014

 

Observations and Comments

 

Spillway

Seegage



Sheet 2 of 8

 

The dead trees noted on the face of dike #2 have been cut up and removed and the
small holes noted at the toe of dike #2 have been backfilled, as requested.

The spillway approach, control section, and channel were ail clear and unobstructed.
The concrete apron, control weir, chute and side walls remain in excellent condition, with no signs
of cracking or spalling on the concrete surfaces.

The outlet tunnel was not inspected on this date.

   
 
 
  

in 2012, EBMUD dewatered the penstock, and walked and inspected the entire length of the
penstock DSOD has not inspected the conduit
since 2004; therefore, i requested that EBMUD notify our office the next time the conduit is

dewatered so that an inspection can be scheduled.

The penstocks are each equipped with an upstream valve and
two valves. The - conduit?s

valve and two -

valves were fuiiy cycled during the penstock inspection on 2/2/2012. The full operation of the

conduit's valve and two valves were last witnessed by DSOD
in 2004 and 2007, respectively. Arrangements need to be made to witness their full cycling during
the next maintenance inspection.

   

The left abutment drainage edit at the toe of the main dam was flowing at approximately ~75 gpm.
Flow through the drainage field at the toe ofthe main dam was measured a_ or ~54 gpm.
Flow from the relief wells at the toe of the main dam was about ~130 gpm. These are normal flows
for the time of year and the lower reservoir level.

Dike #1 remains in good condition with no signs of seepage on the face or groins of
the embankment. Saturated conditions at the toe were due to recent rainfall.

 

Dike #2 remains in good condition with no signs of seepage on the face or groins of
the embankment. The relief wells along the toe of the dike were trickling or flowing as
normal. Saturated conditions at the toe were due to recent rainfall.

Bikes #5 and #6 were above water on this date. The normal artesian flow was noted at
several points along the toe of dike and appeared unchanged.

These conditions match those observed at the dam during previous maintenance inspections with
the reservoir at similar elevation. All seepage at the dam and dikes was judged to be normal.

instrumentation at this dam consists of 191 piezometers, 9 open wells, 49 survey monuments and
26 seepage monitoring points. The most recent surveillance data and summary was submitted with
an owner?s letter on January 24, 2014, and covers the period between November 1, 2012 and
October 31, 2013.

Piezometers and Open Wells The owner has changed the format of instrumentation submittals.
Ali instrumentation data is now grouped by embankment, and includes sectional views of
piezometer locations and depths, as requested in previous reports.

 

Piezometer levels at the main dam remained within historic ranges, except for Piezometer MD-7B,
which was read during a high reservoir stage and was abou_ higher than normal maximum.

 

 

 DANE AND RESERVOIR IN STATUS

NameofDam Camanche Darn NO. 31-16

 

 

Date of inspection 3/27/2014

 

Observations and Comments

 

This is not considered a significant increase, and does not pose a darn safety concern, as it was
probably due to the higher-than?normal reservoir level.

Piezometer levels at Dike 1 remained within historic ranges, except for Piezometer which
exceeded the normal maximum of 190 feet by 1 foot during a higher-than?normal reservoir stage.
This is not considered a significant increase, and the increase does not pose a dam safety concern,
as it was also likely due to the high reservoir level.

Piezometer levels at Dike 2 remained within normal historic ranges, except for Piezometer 
which exceeded its normal maximum by two or three feet throughout the reporting period. The
owner believes that this unusually high piezometric level may be due to the establishment of a new
seepage path between the reservoir and the piezometer. The higher readings continue to fluctuate
with the reservoir level, and do not appear to pose any immediate threat to dam safety; however,
this piezometer should be monitored closely by EBMUD, and any changes should be immediately
reported to DSOD.

As noted in previous reports, Dike 2 Piezometers 2, 19 and 29 have in the past showed signs of a
slight increasing trend, but subsequent data shows that these readings have returned to normal.

All other piezometers remained within historic ranges. I found no other irregularities or anomalies in
the piezometer data which indicated any problems or dam safety concerns.

lVlOnuments Survey data at the Main Dam, Dike 1, and Dike 2 is obtained quarterly for vertical
movement only. Monument surveys showed little movement (abou- in 2012 and 2013,
which was expected. The maximum horizontal movement for all surveyed monuments has been
less thal_ between 1993 and 2013. This is reasonable movement for a large earthfill dam
or a mid-sized earthfill dike. I found no irregularities or anomalies in the survey data which
indicated any problems or dam safety concerns.

Seepage Seepage drain readings declined in 2012 and 2013, due to drier weather and lower
reservoir levels. The high seepage drain readings from the previous years can be explained
satisfactorily as the result of heavy rainfall and runoff. Lower rainfall totals in 2012 and 2013 have
seen seepage readings return to normal levels.

Seepage at Bikes 3, 4, 5, and 6 was reported by the owner as negligible.

As noted in the previous report, drains MD-SDS, 1520T and 211TOE each nearly doubled
the previous normal high flow in 2010. However, subsequent data shows that seepage flows at all
of these drains have returned to normal levels. I found no irregularities or anomalies in the
seepage data which indicate any problems or dam safety concerns.

The current instrumentation network is found to be adequate. No new instrumentation is deemed
necessary at this time.

 

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