HomeMy WebLinkAboutWQCS00054_Quarterly Progress Report_20220812 UNIONCOUNTY
WATER
Mr. John Hennessy
North Carolina Department of Water Resources
Water Quality Permitting Section/NPDES RECEIVED
1617 Mail Service Center
Raleigh,NC 27699-1617 AUG 11 2022
August 5, 2022
NCDEQIDWRINPDES
RE: EMC SOC WQ S20-001 August 2022 Quarterly Progress Report
Mr. Hennessy,
Union County Water receieved the fully excuted SOC for the Grassy Branch WRF on June 21, 2022. A
requirement of this SOC the County is to submit quarterly progress reports and this letter is intended to
serve as the first quarterly progress report. Below is a summary of items that are underway.
For Collections system permit WQCS00054:
• Ongoing inflow and infiltration(I&I)rehabilitation in the Grassy Branch basin.
o Awaiting a formal quotation to perform the repairs identified in the CCTV investigation.
Attached is a draft of the I&I report from Hydrostructures.
For NPDES Permit NC0085812:
• Submit Contract documents for regulatory approval for Grassy Branch WWTP upgrade project.
o A Request for Qualifications(RFQ 2022-082)for Engineering Services for the Grassy
Branch WRF Expansion was avertised on July 6,2022. The biding period ends on August
10,2022. An internal review of all qualifying bids will follow.
If you have any further questions please contact me at 704-296-4215.
Sincerely,
Andrew Neff,PE
Water& Wastewater Division Director
CC: Hyong Yi, Public Works Administrator
John Shutak, Engineering Division Director
Josh Brooks,Assistant Division Director, Water&Wastewater
Greg Morgan,Utility Field Services Superintendent
Jonathan Jordan, WRF Superintendent
Jacob Allen, WRF Supervisor
Union County Water
4600 Goldmine Rd
Monroe, NC 28112
T 704.289,1434
unioncountync.gov/water
RECEIVED
A(JG 12 2022
ing and Video Assessment NCDEQJowRJNFDES
er Mains & Laterals
Grassy Branch
Collection system
FY 2021 - 2022
PREPARED FOR
UNIONCOUNTY
WA' E R
HTDROSTRUCTURES,PA
126 Commerce Court
Pittsboro,NC 27312
919.542.5002
CONDITION ASSESSMENT REPORT
Grassy Branch Collection System
Union County Water
June 2022
INTRODUCTION
The Grassy Branch Sewer Collection System has been a concern for Union County Water
for a number of years due to the Grassy Branch Water Reclamation Facility (WRF)
frequently exceeding its capacity. Dating back to 2016,the County has conducted several
flow monitoring studies to quantify the amount of infiltration and inflow (I-I) entering the
system during periods of wet weather. It has also performed several phases of sewer
system evaluation activities including smoke testing, manhole inspections and iTracker
micro-detection studies to identify the exact sources of I-I. It has subsequently repaired
any of these defects that were identified.
At the present time, the County is confident that the problem is simply a lack of capacity
since the average dry weather daily flow rate is very close to the treatment capacity of the
Grassy Branch WRF. Even minor amounts of I-I will cause the WRF to exceed its capacity
and potentially result in sanitary sewer overflows (SSOs) in the system. Despite this, the
County decided to perform CCTV inspections of all sewer mains and laterals within the
Grassy Branch collection system to identify any defects that could potentially allow I-I to
enter the system.
This report presents the findings of these CCTV inspections. The information gathered
during the study has been used to identify specific defects within the system and develop
repair/rehabilitation recommendations with cost estimates in order to assist the County
with reducing Ill into the collection system.
II. GRASSY BRANCH COLLECTION SYSTEM INVENTORY
The Grassy Branch collection system ends at the WRF just north of Old Fish Road, runs
parallel to Grassy Branch, crosses Unionville Road and Sikes Mill Road to Piedmont
High School and Middle School. (This system also receives sewer via a force main from
Unionville Elementary School) A"Sewer Main Priority Rating Map" is included in
Appendix A and shows the full extent of the gravity collection system and study area.
This collection system includes approximately 30,868 linear feet of gravity sewer. The
mains are a mix of polyvinyl chloride (PVC) and ductile iron pipe (DIP). Table 1, below,
lists the footage of each diameter and material of pipe found in the study area.
TABLE 1 —SUMMARY OF PIPING
Pipe Diameter/Material Total Footage(FT)
6-inch PVC 739
8-inch PVC 18,608
Page 1 of 14
Grassy Branch—Condition Assessment Report
Union County Water
Pipe Diameter/Material Total Footage(FT)
8-inch DIP 2907
12-inch DIP 474
12-inch PVC 8140
III. RESULTS OF FIELD INVESTIGATIONS
A. Cleaning and Internal CCTV Inspection
All lines were cleaned using a high-velocity jet/ vacuum truck in order to remove debris
and provide an unobstructed view of the pipe surface. After cleaning, the lines were then
visually inspected by means of a closed-circuit television (CCTV) system, which includes
a self-propelled tractor and camera unit. The camera is coupled with an inspection system
containing both digital video recorders, footage counter and a laptop equipped with IT
Pipes video inspection reporting software. Service laterals were inspected using a special
system that"launches" a smaller camera up into the lateral from the main.
For each mainline section or lateral, an inspection log was prepared showing the location
of any structural defects, offset or separated joints, points of infiltration, roots, etc. The log
also shows the location of all service connections and upstream and downstream manhole
numbers. The complete inspection was also recorded on videotape and captured digitally
on MPEG files. A copy of the inspection logs is contained in Appendix B. Digital videos
and digital inspection logs for each line segment are included on Appendix D (thumb
drive).
Once all the lines were cleaned and inspected, the next step was to evaluate each line
and prioritize the lines according to condition severity. Based on our evaluations, each
defect was assigned a priority rating from 1 to 5. The priority rating system uses the
NASSCO Pipeline Assessment and Certification Program (PACP) and Lateral
Assessment Certification Program (LACP) methodology described below.
• Grade 5—Defects require immediate attention. Pipe has failed or will
likely fail within the next five years
• Grade 4—Severe defects that will become Grade 5 within the
foreseeable future.
• Grade 3—Moderate defects that will continue to deteriorate
• Grade 2—Defects that have not begun to deteriorate.
• Grade 1 — Minor defects
NASSCO recognizes two families of defects: structural defects and operation and
maintenance (O&M) defects. Structural defects are various types of defects within the
structure of the pipe including cracks, fractures, broken pipe, collapsed pipe, offset or
separated joints, surface damage from expose to hydrogen sulfide gas, etc. Operation
and maintenance defects include deposits(grease, sand), roots, infiltration, obstructions,
etc. that affect the system's ability to operate properly.
NASSCO also assigns each structural and O&M defect with a grade rating corresponding
to the severity of the defect (5 the most severe and 1 the least severe). A grade score is
Page 2 of 14
Grassy Branch—Condition Assessment Report
Union County Water
calculated by multiplying the grade rating by the number of occurrences of that grade
identified throughout the pipe. The grade scores are summed in their appropriate families
(structural and O&M)to calculate the structural defect rating and O&M defect rating. The
overall rating is the sum of structural and O&M defect ratings. Each pipe is also assigned
a quick rating, which is a four-digit number showing the number of occurrences for the
two highest severity grades occurring in that pipe(the number is displayed with the grade
rating first followed by the number of occurrences). For example, if the pipe inspected
has two grade 5 defects and six grade 4 defects the quick rating would be 5246.
Hydrostructures assigns a priority ranking based on the severity of the worst defect
contained in the line. Therefore, a line containing a structural collapse (grade 5) would
be scored as a priority 5. The results of the priority rating process are provided in the
table below.
Zero(0)priority 5, one(1)priority 4,thirty-four(34)priority 3, one(1)priority 2, and ninety-
one (91) priority 1 mainline pipe sections were identified in the collection system (Table
2 below). A "Sewer Main Priority Rating Map" is provided in Appendix A and shows the
location and priority rating for all mainlines inspected as part of this evaluation. CCTV
logs for all pipe segments inspected on the system are included in Appendix B.
TABLE 2— MAINLINE PRIORITY RATING SUMMARY
Priority Rating Quantity
Priority 5 0
Priority 4 1
Priority 3 34
Priority 2 1
Priority 1 91
Table 3: CCTV Inspection and Condition Summary Spreadsheet on the following pages
summarizes the results from the CCTV inspections and includes the structural and O&M
defects discussed above for each sewer main. Data for each manhole-to-manhole
section is presented as follows:
• Sewer line identification number
• Upstream and downstream manhole number
• Physical location description
• Pipe material
• Pipe diameter
• Surveyed pipe length
• Priority Rating
• Rehabilitation Recommendations
Page 3 of 14
Grassy Branch—Condition Assessment Report
Union County Water
•
Table 3:CCTV Inspection and Condition Summary Spreadsheet(PACP)
Pipe Surveyed
Sewer Line Upstream Downstream Pipe Priority
Location Diameter Length Rehabilitation Recommendations
I.D.Number Manhole No. Manhole No. Material (in.) (ft.) Rating
16021 13827 13828 SMITHFIELD DR PVC 8 224.4 None
16022 13828 13846 SMITHFIELD DR PVC 8 235.2 None
_ 16020 13857 13846 SMITHFIELD DR DIP 8 326.1 None
16023 13846 13845 SMITHFIELD DR PVC 8 68.2 F None
16248 SF340 13845 SMITHFIELD DR DIP 8 21.9 None
16013 13843 13844 SMITHFIELD DR DIP 8 404 3 None
16012 13842 13843 SMITHFIELD DR PVC 8 212 None
16008 13961 13841 CHRISTIAN CRT PVC 8 163.3 1 m None
16247 SF339 13961 CHRISTIAN CRT PVC 8 14.4 I None
16010 13840 13841 SMITHFIELD DR DIP 8 134.5 j None
16011 13841 13842 SMITHFIELD DR DIP 8 122.4 1, , None
16009 13839 13840 SMITHFIELD DR PVC 8 149.4 t 1 None
16014 13844 13847 CORI JON DR PVC 8 173.5 �Y11 None
16015 13847 13848 CORI JON DR PVC 6 282.5 None
16016 13848 13960 CORI JON DR PVC 8 101.5 1 None
16018 13849 13960 CORI JON DR PVC 6 155 _ None
16019 13960 13853 CORI JON DR PVC 8 213.8 r i_�--_ None
16017 13850 13849 CORI JON DR PVC 8 144.4 None
16038 13835 13834 SMITHFIELD DR PVC 8 325.5 { None
16039 13834 13851 SMITHFIELD DR PVC 8 175.3 1 None
16030 13829 13830 SMITHFIELD DR PVC 8 390.8 1 None
16031 13830 13831 SMITHFIELD DR PVC 8 400 ! J None
16032 13831 13832 SMITHFIELD DR PVC 8 110.3 I None
16033 13832 13833 SMITHFIELD DR PVC 8 94.8 j None
16029 13856 13833 SMITHFIELD DR PVC 8 321.2 I None
4061 7533 7534 LOXDALE FARM DR PVC 8 310.2 j None
16249 C0874 7533 LOXDALE FARM DR PVC 8 41.7 ( ( None
4073 7540 7534 HENRY SMITH RD PVC 8 252.1 1 j None
4072 7539 7540 HENRY SMITH RD PVC 8 86 IFF None
4070 7538 7539 HENRY SMITH RD PVC 8 68.3 j 1 f None
4063 7534 7535 LOXDALE FARM DR PVC 8 306.2 1 I None
4065 7535 7536 LOXDALE FARM DR PVC 8 137.4 I_ ' None
4067 7536 7537 LOXDALE FARM RD PVC 8 421 1 1 None
4074 7541 7537 ERINDALE CRT PVC 8 300.4 _ 1 None
16250 C07541 7541 ERINDALE CRT PVC 8 56.4 1 _ None
4075 7542 7537 LOXDALE FARMS DR PVC 8 424.7 1 None
4068 7537 7530 ERINDALE CRT PVC 8 426.1 Inject Upstream Pipe Connection.MR 7537,two
runners.
4057 7531 7530 FALLING LEAF CRT PVC 8 55.8 ' None
4059 7532 7530 FALLING LEAF CRT PVC 8 203.6 None
4058 7530 PS7530 FALLING LEAF CRT PVC 8 265.6 . ,2(ILL. None
4909 2783 2781 SIKES MILL RD DIP 8 374.7 3 None
4910 2781 2780 SIKES MILL RD PVC 8 422.1 3 None
Install Lateral Seal @46'.Runner between lateral&
4913 2784 2/78 SIKES MILL RD PVC 8 425.7
4 mainline.
4911 2780 2784 SIKES MILL RD ZZZ 8 395 3 None
4915 2778 2779 SIKES MILL RD PVC 7 8 167 3 Sag.No repair needed. 1
4917 2779 2777 SIKES MILL RD PVC 8 206.8 '',1 " 'r.`.'i None
4919 2777 2776 SIKES MILL RD ZZZ 8 200.6 4.., w None
4921 2776 2775 SIKES MILL RD ZZZ 8 76 3 None
4921$ 2776 2775 SIKES MILL RD ZZZ 8 44.4 3 None
4923 2775 2764 SIKES MILL RD PVC 8 426.2 ''i None
8775 2764 7543 SIKES MILL RD PVC 8 267.2 3 None
8776 7543 2774 SIKES MILL RD PVC 8 127.7 1 None
4939 2768 2767 UNIONVILLE RD PVC 8 264.6 * 3 None
4941 2767 2766 UNIONVILLE RD PVC 6 301.1 1 None
4943 2766 2765 UNIONVILLE RD PVC 8 291.1 3 None
install 4 Sectional iiner(ip43" Dripper at joint
4945 2765 2762 UNIONVILLE RD DIP 8 102.5 3 between DIP&PVC
4949 2761 2763 UNIONVILLE RD PVC 8 404.9 3 None
16041 13858 13956 RUSHING BENTON RD PVC 8 170.3 3 None
16042 13956 13957 RUSHING BENTON RD PVC 8 312.1 ,' None
16043 13957 13958 RUSHING BENTON RD PVC 8 392.4 None
16044 13958 13959 RUSHING BENTON RD PVC 8 399.2 None
16045 13959 13951 RUSHING BENTON RD PVC 8 215.3 ;` None
Pipe Surveyed
Sewer Line Upstream Downstream Location Pipe Diameter Length Priority Rehabilitation Recommendations
I.D.Number Manhole No. Manhole No. Material (in.) (R.) Rating
16046 13951 13952 RUSHING BENTON RD DIP 8 105.4 None
16047 13952 13953 RUSHING BENTON RD PVC 8 406.6 None
16048 13953 13954 RUSHING BENTON RD PVC 8 165.2 None
16049 13954 13955 RUSHING BENTON RD PVC 8 153 None
16050 13955 13948 RUSHING BENTON RD PVC 8 390.4 None
16051 13948 13949 RUSHING BENTON RD PVC 8 161.6 None
16052 13949 13950 RUSHING BENTON RD PVC 8 133.7 3,., None
4951 2763 2760 UNIONVILLE RD DIP 8 387.2 3 None
4953 2760 2759 UNIONVILLE RD - DIP 8 87 3 None
4955 2759 2758 UNIONVILLE RD PVC 8 114.4 3 None
4957 2758 2757 UNIONVILLE RD PVC 8 174.7 3 None
4959 2757 2756 UNIONVILLE RD PVC 8 256.8 3 None
4961 2756 2755 UNIONVILLE RD PVC 8 _ 142.6 3 None
16053 2755 13950 1 UNIONVILLE RD DIP 8 156.7 3 Sag.No Repair Needed
4963 13950 2754 UNIONVILLE RD PVC 12 167.3 None
4965 2754 2753 UNIONVILLE RD PVC 12 418.3 None
4967 2753 2752 UNIONVILLE RD PVC 12 375.7 None
4969 2752 2751 UNIONVILLE RD PVC 12 300.3 None _
4971 2751 2750 UNIONVILLE RD PVC 12 302.3 3 None
4973 2750 2749 UNIONVILLE RD PVC 12 362.5 3 None
4975 2749 2748 UNIONVILLE RD PVC _ 12 397.8 None
4977 2748 2747 UNIONVILLE RD PVC 12 _ 233.7 None
4981 2746 2745 CLONTZ LONG RD PVC 12 223.5 None
4983 2745 2744 CLONTZ LONG RD PVC 12 428 None
4979 2747 2746 CLOTZ LONG RD PVC 12 232.2 None
4985 2744 2743 CLONTZ LONG RD PVC 12 316.5 None
4987 2743 2742 CLONTZ LONG RD PVC _ 12 1 402.4 None
4989 2742 2741 CLONTZ LONG RD PVC 12 277.8 None
8777 2741 7544 CLONTZ LONG RD PVC 12 72.2 None
8778 7544 2740 CLONTZ LONG RD PVC 12 356.5 None
4993 2740 2739 CLONTZ LONG RD PVC 12 427.7 None
4994 2739 2738 CLONTZ LONG RD PVC 12 233.1 None
8688 2738 2737 CLONTZ LONG RD PVC 12 85 None
8689 2737 2736 CLONTZ LONG RD PVC 12 93 None
8687 2736 2735 OLD FISH RD PVC 12 335.6 None
4997 2735 2734 OLD FISH RD PVC 12 395.7 None
5012 2727 2726 OLD FISH RD PVC 12 111 None
Inject Leak in Downstream Manhole Z725.Small
4018 2726 2725 OLD FISH RD PVC 12 421.6 hole with runner.
5001 2733 2732 OLD FISH RD DIP 12 252.9 1111 None
5003 2732 2731 OLD FISH RD PVC 12 298.9 None
Inject Pipe Connection in Upstream Manhole
5005 2731 2730 OLD FISH RD PVC 12 98.4 2731,runner
5007 2730 2729 OLD FISH RD DIP 12 109.1 3 None 1
5009 2729 2728 OLD FISH RD DIP 12 77.2 3 None
5011 2728 2727 OLD FISH RD PVC 12 202.1 None
4016 2725 2724 OLD FISH RD PVC 12 86.3 None
4014 2724 2723 OLD FISH RD PVC 12 169 3 Inject Leak in Upstream Manhole 2724,runner.
8773 2723 P52723 OLD FISH ROAD DIP 12 34.4 3 None
4927 2774 2773 UNIONVILLERD PVC 8 362.5 3 None
4929 2773 2772 UNIONVILLERD PVC 8 284.5 3 None
4931 2772 2771 SIKES MILL RD PVC 8 253.5 None
4933 2771 2770 SIKES MILL RD PVC 8 234.2 None
4935 2770 2769 SIKES MILL RD PVC 8 389.3 3 None
4937 2769 2768 SIKES MILL RD PVC 8 422.3 None
16025 13845 13852 SMITHFIELD DR PVC 8 381.4 None
16026 13852 13853 SMITHFIELD DR PVC 8 171.6 None
16027 13853 13855 SMITHFIELD DR PVC 8 397.4 None
16028 13855 13856 SMITHFIELD DR PVC 8 149.8 None
16034 13833 13858 SMITHFIELD DR PVC 8 219.2 None
16040 13851 13858 SMITHFIELD DR PVC 8 204.4 None
4947 2762 2761 UNIONVILLE RD PVC 8 395.5 3 None
8944 7545 7544 CLONTZ LONG RD DIP 8 414.8 3 Note:Manhole 7545 buried under rocks. _
4999 2734 2733 OLD FISH RD PVC 12 315.2 None
16035 13838 13837 SMITHFIELD DR PVC 8 158.7 None
16036 13837 13836 SMITHFIELD DR PVC 8 402.3 None
16037 13836 13835 SMITHFIELD DR DIP 8 270.4 None
Structural Defects
Very few structural defects were identified in the mainline sections. Two sags were identified that
do not require repair. The remaining pipe was found to be in good condition.
Operation and Maintenance Defects and Infiltration
O&M defects include debris, sand, rocks, grease, infiltration, etc. The sewer cleaning removed
most settled I attached debris and deposits. There were very few maintenance defects and only
one mainline joint with infiltration that needs a 4' sectional liner. This joint, between DIP and PVC,
had a small dripper. See photo below.
Se•ment between MH2762 - 2765— Infiltration dri••er at otnt 43' downstream
Distance' 43.6
IC). !Mil Dripper �,
Clock from: �, • , —
Clock to: 9 •
SiMtC:
Dimensiuni •
Dtrnert:ion2
Rern ar$ ..,
There was only one service lateral that needs a lateral seal for infiltration that is coming between
the service lateral and the mainline section. See photo below.
Service at 46' upstream of manhole 2784 has small runner.
Distance 47 Ci,-
r Viir
Clock #rc'rr,
CIc'ck: ic, 4
Rating:
SlMtL: r;
Dimenston1
Dimersocrt2 "
•
Remar1
Page 6 of 14
Grassy Branch—Condition Assessment Report
Union County Water
B. Service Lateral CCTV Inspection
In addition to the PACP inspection of all pipe segments, each service lateral was
inspected and prioritized according to the Lateral Assessment Certification Program
(LACP).. Based on our evaluations, each defect was assigned a priority rating from 1 to
5. The priority rating system uses the NASSCO Pipeline Assessment and Certification
Program (PACP) methodology described above.
A total of 132 service laterals were located in the collection system at the time of the
project and all except 3 were inspected. All were PVC and 4.-inches in diameter. A few
had grease, sags, or offset joints, but only one requires repair. Each has been assigned
a priority rating and the summary table isi provided below. Zero (0) priority 5, one (1)
priority 4, one (1) priority 3, eleven (11) priority 2, and one hundred sixteen (116) priority
1 service laterals were identified in the collection system (Table 2 below). A"Sewer Main
Priority Rating Map" is provided in Appendix A and shows the location for all service
laterals inspected as part of this evaluation. Inspection logs for all the service laterals are
included in Appendix C.
TABLE 4— LATERAL PRIORITY RATING SUMMARY
Priority Rating Quantity
Priority 5 0
Priority 4 1
Priority 3 1
Priority 2 11
Priority 1 116
Only one service lateral needs to be replaced. Signs of infiltration and roots were found
in the lateral that is 81' upstream of manhole 7530; located at 2710 Falling Leaf Court.
See photo of stain below.
•
I• ots .: ,.�, �
♦ *a
I
fit
,441.‘
BRANCH CCTV AND LATERALS-7530 81.5 2710-2710 FALLING LEAF CRT
Page 7 of 14
Grassy Branch—Condition Assessment Report
Union County Water
Table 5: Service Lateral Inspection and Condition Summary Spreadsheet on the following
pages summarizes the results from the service lateral inspections and includes the
structural and O&M defects for each service lateral. Data for each lateral section is
presented as follows:
• Inspection I.D.
• Sewer line identification number
• Service lateral identification number
• Mainline identification number
• Physical location description
• Surveyed lateral length
• Priority Rating
• Rehabilitation/Repair Recommendations
Page 8 of 14
Grassy Branch—Condition Assessment Report
Union County Water
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IV. ALTERNATIVES EVALUATION
Several methods and technologies are available for the rehabilitation of sewer mains and
service laterals. This section discusses the available and most commonly recommended
/ implemented rehabilitation methods.
A. Manhole Rehabilitation and Repairs
1. Pipe Connection Infiltration
Pipe connections between the manhole wall and the influent and effluent piping
are sometimes found to be sources of infiltration and root intrusion. These
connections may lack a boot(typically older brick manholes)and not be adequately
grouted or the boot was not properly seated and tightened around the pipe during
installation. Infiltration is especially prevalent in deeper manholes, where the
hydrostatic pressure from high groundwater levels can cause significant leaks
through relatively small cracks and holes.
We recommend that leaking pipe connections be sealed by injecting chemical
grout pumped through drilled injection ports into the crack or void from the inside
of the manhole. The grout will penetrate to the exterior of the manhole, where it
will fill any voids and seal the leak from the outside. After the void has been filled
with chemical grout, cementitious grout should be used to seal the pipe connection
from the inside of the manhole.
Estimated Cost: $500.00 per Pipe Connection.
B. Sewer Main Rehabilitation and Repairs
1. Open-Cut Point Repairs
A point repair consists simply of excavating down to a damaged section of pipe
and replacing the damaged section with new pipe. It is used when damage is
isolated to one particular area of the pipe, generally less than twenty feet in length.
It is also used to repair pipe collapses, sags, and/or offset joints prior to manhole-
to-manhole trenchless rehabilitation by CIPP. It can be very disruptive to the
surrounding area, especially if the pipe is deep or underneath pavement. It can
also be extremely expensive depending upon the location and/or depth of the
repair.
Estimated Cost: 8" — 12" = $12,500
15"— 18" = $17,500
*Includes bypass pumping, assumes DIP
2. Internal CIPP Sectional Liner (CIPP Spot Repair)
Sectional cured-in-place spot repairs are ideal for patching holes and other
isolated, non-deformed structural defects. Spot repair patches can be used for
infiltration control when hydrophilic 0-rings or caulk is used between the host pipe
Page 11 of 14
Grassy Branch—Condition Assessment Report
Union County Water
and ends of the repair patch. Most manufactures have repair patches available
up to 42-inches and lengths of 2, 4, and 8-feet are common. Patches are
fiberglass with epoxy resin or typical felt with vinylester resin.
Spot repairs are installed with a flow through bladder. The patch is secured to
the inflatable bladder, pulled into place, the bladder pressurized to form the patch
tightly to the pipe surface and allowed to cure ambiently. Because the bladder is
flow through, little or no flow control is required during installation
Estimated Cost: 8"— 12" = $5,000
15" — 18" = $9,500
C. Service Lateral Rehabilitation and Repairs
The following section discusses service lateral rehabilitation methods including
connecting service laterals to the main line. Cost estimates for each method are
provided based on similar rehabilitation projects.
1. Open-Cut Replacement
This method of repair consists of excavating the defective service lateral and
replacing it with a new lateral within the same trench. This method is the most
cost effective to rehabilitate shallow service laterals in low traffic areas. Although
it obviously requires more excavation, it is the most frequently recommended
method for service rehabilitation. Service lateral replacement is only performed
from the sewer main to the right-of-way(location of the cleanout).
Estimated Cost: $100 per linear foot of service lateral
(If the replacement of the lateral includes the replacement or installation of a
cleanout and reconnection to the main line, the total cost is usually an additional
$2,000 or$3,000.)
2. CIPP Lateral Seal
Full Wrap Lateral Seal rehabilitation is a trenchless service connection
rehabilitation method used to seal leaking service connections and restore
structurally integrity. Full wrap lateral seals are recommended when conflicts or
depth increase the difficulty and cost of excavation. A full wrap later seal includes
a polyester felt tube with a sewn flange that covers up to 16-inches of the mainline
in a full wrap. The use of hydrophilic sealants and silicate resins applied to the
backside of the full warp connection enhances the watertight seal. Typically, this
wrap includes 2-feet of lateral liner to extend up into the service lateral. Ambient
cure polyester or vinylester resins are used. Diameters of 4-inch and 6-inch
service lateral rehabilitation are possible with 8-inch to 24-inch mainline wraps.
During installation,the mainline must be cleaned and free of all debris. Roots and
other debris are removed from the lateral connection. The full wrap lateral seal is
loaded on a silicone bladder lateral train and inserted through the downstream
Page 12 of 14
Grassy Branch—Condition Assessment Report
Union County Water
manhole. When the lateral train reaches the connection (as confirmed by
standard CCTV equipment), the bladder is inflated and held at the recommended
air pressure while the connection seal is allowed to cure. Once cured, the bladder
is removed and the service is returned to use.
Estimated Cost: $ 10,500.00 per CIPP lateral seal
2. Reconnecting Laterals to Main Line
This process consists of reconnecting a lateral to a sewer main by use of a saddle
or fitting. It is used to repair break-in taps or other defective connections, which
are very common in older collection systems. These connections are very
susceptible to ground water infiltration and root intrusion. It is recommended that
break-in taps be replaced by a saddle connection.
Estimated Cost: $6,000.00 per service lateral
3. Installation of Clean-outs
Many older service laterals were installed without clean-outs at the property line
(right-of-way). Without them, it can be very difficult to remove blockages that can
occur in the laterals. If a clean-out on private property is used, it can be difficult to
determine whether the responsibility for removing a blockage lies on the property
owner or the municipality. To allow for easier maintenance, we recommend that
all service laterals have clean-outs installed at the property line or edge of right-of-
way.
Estimated Cost: $1000.00 per clean-out
Page 13 of 14
Grassy Branch—Condition Assessment Report
Union County Water
V. REPAIR / REPLACEMENT / REHABILITATION (RRR) RECOMMENDATIONS WITH
COST ESTIMATES
Overall, the collection system was found to be in very good condition. Only a few active
infiltration defects were identified; most were in manholes or at the manhole/pipe
connection. Because there are so few repairs, the price of each repair can be expected to
be highly inflated if this work is done as a standalone project. We recommend including
these few repairs in with another sewer rehabilitation project in order to obtain better
overall pricing.
TABLE 6: RRR COSTS
Estimated Unit
Description Quant. Cost Extended Amount
Rehabilitation _
Inject Leak in Manhole Wall 2 EA $1000.00 $2,000.00
Inject Pipe Connection in Manhole 2 EA $500.00 $1,000.00
Install 4' CIPP Sectional Liner in
Main 1 EA $5,000.00 $5,000.00
Reconnect Service Lateral 1 EA $6,000.00 $6,000.00
Replace Service Lateral 36 LF $100/LF $3,600.00
Sub-Total $17,600.00
Contingencies (10%) $1,760.00
Engineering and Inspection (15%) $2,640.00
Estimated Total $22,000.00
*Actual price may be inflated unless these items are combined with another project.
*Service lateral replacement is located on private property.
VI. CONCLUSION
This report presents the data, results, and recommendations from the evaluation of the
Grassy Brach gravity collection system. Based on the CCTV inspection results, there are
only a few minor defects in the collection system that need to be addressed.
We encourage Union County Water to move forward with the recommendations presented
in this study. Following these repair recommendations will reduce I/I reaching the WRF.
Furthermore, tending to these issues will prevent these defects from getting worse over
time. We also recommend that the County include these repairs in with another sewer
rehabilitation project for the best possible cost benefit.
Hydrostructures, P.A. has extensive experience with trenchless rehabilitation engineering,
and we would welcome the opportunity to assist the County with the implementation of
RRRs proposed in this report.
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Grassy Branch—Condition Assessment Report
Union County Water