Infiltration/Inflow Status June 1989Robert Book, President
Max Moore, Vice President
Myrneth Anderson, Secretary
Robert Steinhart, Treasurer
CLAY, TOWNSHIP
REGIONAL WASTE DISTRICT
10755 N. COLLEGE
P.O. BOX 40638
INDIANAPOLIS, IN 46240 -0638
317 -844 -9200
June IL 1989
Honorable Dorothy Hancock, Mayor
City of Carmel
40 East Main Street
Carmel, IN 46032
RE: Infiltration /Inflow Status
Dear Mayor Hancock:
Richard Helmuth
Jack L. Edwards
John Schneider
Marvin Pike, Manager
This letter will give you an update on our work to control the
Infiltration /Inflow into our sewer system.
Attachment A" is a summary of our flow for the month of. May,
which averaged 1.258 MGD. There was 6.9 inches of rain in the
month with a maximum of 3.5 inches in two storms on May 25th and
26th, 1989. This followed the month of April with 8 inches of
rainfall. Our peak- flows were ,.,on the 26,t h and 27th at 2.320 MGD
and 2.298 MGD, respectively: Peak hourly flows were slightly over
a 4.0 MGD rate for 5 hours during the heavy rainfall period. This
storm was a, severe test on the'system.
Attachment B. shows the 3 4 manholes and 2: clean ..outs that were
found to be submerged by ponded water duringthe-storm event. Of
these, six were for a significant time Wand the 'remaining 30 for
only a short period' of time. This resulted in significant inflow
to the sewer system. ' •.The-District has the six waterproof castings
in stock and is arranging:- for their installation.: - On the remaining
28 manholes, arrangements <are"- :being.made'to install a gasketed
fiberglass insert beneath -_the manhole. lids On the 2' clean outs,
a plumbers plug will `be, used' .tor. "seal 'the .8 -inch pipe immediately
beneath the cover.
Attachment C shows 10 sewer sections between manholes that
will be televised to identify leaks. that were discovered by
physical inspection of the sewers and by flow. measurements. When
the problems are identified, they will be repaired by grouting or
by dig -up if necessary.
Attachment D shows the manholes located on our main
interceptor, 21 -inch and 24 -inch, which have significant leaks
primarily at the entry point into the manhole. These leaks
are a major portion of both our sustained and rainfall induced
Honorable Dorothy Hancock
June 13, 1989
Page 2
infiltration. Arrangements have been made to repair these leaks
by a combination of chemical grout from the outside and grout on
the inside.
Attachment F shows manholes throughout the system which have
minor leaks which are not major contributors, but which need to be
repaired. Arrangements have been made to do this by grouting
procedures.
Enclosed herewith is a map of our sewer system which have
manhole numbers shown for use by those wanting to locate the areas.
In addition to the sources of Infiltration /Inflow identified
in the main system, sump pumps were found to be a significant
source. While specific identification of all homes was not
possible, areas were pinpointed by flow measurements and even by
hearing the pumps running at many locations. A letter has been
sent to the Home Owners Association making them aware of the
situation and the District has authorized enforcement action
against offenders identified. We expect to publicize the
enforcement to encourage other offenders to comply.
We have great expectations for the corrective work that has
been scheduled. Completion in 30 to 45 days is expected. The work
on the sump pump sources is expected to take several months or
longer to get within a controllable situation.
We appreciate your patience with us on our problems. We will
endeavor to complete our work as soon as possible and will keep you
advised of our progress.
If you have any questions feel free to call me or our
Engineers, Samuel L. Moore and Associates, Inc. at (317) 293 -4204.
Very truly yours,
CLAY TOWNSHIP REGIONAL WASTE DISTRICT
77ktr7,--
Max Moore
Enclosures
cc: Don Silvey
Robert F. Campbell
ATTACHMENT A
TOTAL FLOW FOR CARMEL
CREEK LIFT STATION
MAY
DATE FLOW RAINFALL
1 1.913 0.20
2 1.563
3 1.402
4 1.206
5 1.295 0.70
6 1.295
7 1.199
8 1.181
9 1.097 0.60
10 1.221 TRACE
11 1.109
12 1.080
13 0.995 0.20
14 1.006
15 0.994
16 0.959
17 0.998
18 0.935
19 0.897 0.10
20 1.020 0.70
21 0.989
22 0.979 TRACE
23 1.115 1.10
24 1.228
25 1.073 0.20
26 2.320 3.50
27 2.298
28 .1.691
29 1.341 0.10
30 1.358 0.20
31 1.254
3,5
3
FLOW (MG D) RAINFALL
CARMEL CREEK LIFT STATION
TOTAL FLOW
1.5 —/
1
05 —
0
1
ir
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
MAY 1989
FLOW OA co) PAINFALL (INCHES)
ATTACHMENT B
CLAY TOWNSHIP REGIONAL WASTE DISTRICT
MANHOLE CASTINGS UNDER WATER (NON - WATERPROOF)
*JW -1 CP -5
*JW -2 CP -18 (C.o.)
JW -16 CP -19
JW -17 CP -20
JW -20 *CP -33
JW -21 LH -1
JW -22
JW -23 MH -31
MH -32
*CM -18A
CM -38 NV -6
CM -39 NV -12
CM -45
NH -7
*HP -14 NH -8
HP -29
HP -46
*OP -1
OP -5
OP -8
OP -19
OP -24
OP -35
OP -38
OP -40
OP -49 (C.O.)
*Bolt -Down Castings
ATTACHMENT C
CLAY TOWNSHIP REGIONAL WASTE DISTRICT
TELEVISE LINE PRIORITY
CP6 - CP24 501'
JW12 - JW13 496'
NV9 - NV2 248' )
}
CM14A - NV9 455' )
}
NV9 - NV11 398' )
NV12- NV13 568' )
}
NV1A - NV12 340' )
MH29 - MH4 262'
CP8 - CP9 300'
CP14 - CP15 309'
3877'
ATTACHMENT D
CLAY TOWNSHIP REGIONAL WASTE DISTRICT
INTERCEPTOR MANHOLES
Manhole Problem
CM -10 Leak at influent pipe. Leak at
base /barrel joint.
CM -11 Leaks at both pipes.
CM -12 Leaks at both pipes.
CM -13 Leaks at both pipes.
CM -14A Major on outlet pipe
CM -14 Major on both pipes.
MH -4 Major leak 2' downstream of manhole.
MH -5 Major leak on W. Pipe.
MH -5 Major leak on W. pipe.
MH -7
MH -8
MH -29
MH -30
Major leak on E. pipe.
Leaks around both interceptor pipes.
Major leaks at both pipes.
Leak in west side at joint.
NV -1
NV -2
NV -9
NI -13
NI -17
Leaks around west pipe (sides and
bottom).
Leak around east pipe just below
water line.
Major leak 3 pipe lengths away.
Leaks at joint.
Leaks at both pipes.
-1-
Manhole Problem
NI -17A Major at both pipes.
NI -18 Major leaks at both pipes.
NI -19 Missing top MH step
NI -20 Major leaks around both pipes,
especially under west pipe.
NI -21 Leaks around west pipe.
NI -22 Leak around east pipe.
LH -2 Major leaks at both pipes.
Manhole
CM -27
CM -32
June 6,1 1989
ATTACHMENT E
CLAY TOWNSHIP REGIONAL WASTE DISTRICT
MANHOLES - OTHER
Problem
Leak at 3 & 9 on N. pipe
Leaks at joint. Leak in pick hole
for base. Leak at effluent pipe.
CP -21 Leak at flat cap /riser ring joint.
East pick hole leak on base.
JW -12 - Dribbling leak along top of east
pipe.
MH -12 Leak around south pipe.
MH -32 Leaks in base /barrel joint and from
crack in first barbel below cone.
NH -12
NH -22
Leak at joint and pick holes (Major) .
Major leaks around. effluent pipe.
Bad pick hole leak.
NE -3 Major leak at base /barrel joint.
NE -47 Major at W. pipe.
NE -52 Major leaks at influent pipe
NE -53 Major leaks at cone/riser ring and
cone /barrel joints.
NE -61B Minor at joints. Offset casting.
-1-
Manhole
OP -10
OP -11
Problem
Major leaks at east side of effluent
pipe.
Leaks at effluent pipe (major).
OP -12 Leaks at effluent pipe.
June 61 1989
ATTACHMENT F
CLAY TOWNSHIP REGIONAL WASTE DISTRICT
MANHOLES - MINIMAL WORK
Manhole Problem
SI -15 NE & NW Quad - Minor at bench wall
SI -18 Minor leaks at joints.
SI -23 Minor at W. pick hole bottom section.
Reset casting and clean manholes.
CM -19
Leak in pick hole of base.
CM -30 Minor leak in base pickholes.
CM -42 Leak at base.
CP -6 Leaks at first joint (Northeast) and
second joint (Southeast).
CP-8 Leak at base /barrel joint.
CP -10 .- Minor leaks at first and second
joints.
CP -13 Pick hole (south) in barrel section
leaks.
CP -14 Leak second joint from top.
CP -15 Leaks in base /barrel joint (north).
CP -19 Leaks at riser rings.
CP -20 Leaks at riser rings.
JW -5
JW -7
NW Quad - squirter (Major /Minor) in
base Dribbler above N. Pipe.
Major - Riser Rings
-1-
Manhole Problem
JW -8
MH -14
MH -35
NV -13
NV -21
HP -2
HP -37
Squirter Pick Hole N. side - Major -
Riser Rings
Leak in crack in first barrel down
from cone.
Pick hole leak in second barrel.
Leak at pick hole.
Leak beneath casting.
Minor at bottom joint.
Leak at base (Northwest).
NH-2 Leak at pick hole in base.
NH-8 Leak at base pick hole.
NH-9 MH leak at bottom riser ring in east
quadrant.
NH -14 Leak in pick hole on NW section of
base. Other pick hole wet.
NH -17 Leak at 2 pick holes.
NH -18 Small leak in pick hole at bottom
(Northeast).
NE -6 Minor leak bottom joint
NE -43 Minor at joint and pick hole (E side)
NE -49 Leaks at pick holes.
NE -50 Leaks at base pick hole and steps.
-2-
Manhole Problem
NE -56 Leaks at top and bottom of lateral.
NE -61A Minor at bottom joints
OP -20
OP -24
OP -35
SC -4
SC -8
Minor leak at cone joints and riser
rings.
Leaks in base /barrel joint (SE)
Leak in base /barrel joint near steps
Minor seepage at NE side of first
joint.
Slight leak at joint on W side
HH -4 Leaks at S. pickhole in first barrel,
seepage above S. pipe