HomeMy WebLinkAboutCC AG PKT 2012-11-13 #NAGENDA STAFF REPORT
DATE: October 22, 2012
TO: Honorable Mayor and City Council
THRU: Jill R. Ingram, City Manager
FROM: Sean P. Crumby, PE, Assistant City Manager /Public Works
SUBJECT: STORM DRAIN PROGRAM UPDATE
SUMMARY OF REQUEST:
That the City Council receive and file the Storm Drain Program Update and the
College Park East Storm Drain Alternative Report.
BACKGROUND AND ANALYSIS:
The City of Seal Beach completed the first Master Plan of Drainage in 1999.
After experiencing flooding in 2004 the City formed an Ad -Hoc Committee to
better plan for drainage improvements. After one year of meetings and planning,
the Master Plan of Drainage was updated and adopted by the City Council in
2008.
In 2005, the City Council allocated $720,000 for drainage improvements and
constructed the three highest priority projects recommended by the Ad -Hoc
Committee. In December 2008, the City Council allocated $5 million in General
Funds for storm drain improvements throughout the City. Several projects were
designed as prioritized based on the 2008 Master Plan of Drainage. A summary
of the completed projects constructed is as follows:
Project
Notice of Completion Date
Final Project Cost
General Fund Portion
Drainage Master
Plan
November 10, 2008
$125,136.76
$125,136.76
Candleberry Ave
December 14, 2009
$1,741,969.80
$1,131,472.80
Electric Ave
July 11, 2011
$1,924,959.89
$1,924,959.89
Navy Drainage
In Construction
$200,000.00*
$200,000.00*
`The Navy Drainage Easements project is currently in construction. Final costs will be received at the
conclusion of the project.
Agenda Item N
The FY 2012 -2013 Budget has the following two Storm Drain Projects budgeted:
Project Amount
SD1201 Storm Drain Master Plan Improvements (Marina) $1,569,480
SD1202 Navy Drainage Improvements $ 187,400
An update of these two projects is as follows:
SD1201 Storm Drain Master Plan Improvements (Marina)
This project constructs storm drain facilities within Electric Avenue between
Corsair Avenue and Marina Drive. It is rated as the highest priority project within
the 2008 Master Plan of Drainage. The project is currently complete with design
and received approval from the California Coastal Commission on October 18,
2012. The project is bidding and is anticipated to be brought to the City Council
for award of construction on December 10, 2012. The project is being funded
with $1,800,000 in funding from the Successor Agency to the Seal Beach
Redevelopment Agency.
SD1202 Navy Drainage Easements
Portions of Old Town and the Hill have storm drain runoff that drains through
easements that lie on the Seal Beach Naval Weapons Station. Those
easements expired on October 16, 2008. The City was notified by the Navy that
before extension of the easements were granted, maintenance work was
required to the open channels and outlet structures. After budgeting funds,
designing the improvements, and receiving environmental clearance, the project
was awarded on June 25, 2012 and construction began in the summer of 2012.
Construction is now near completion. The budgeted amount in the FY 2011-
2012 budget was $200,000 and a carryover of $187,400 in the FY 2012 -2013
budget. It is anticipated that this project will be brought to the City Council on
December 10, 2012 within the allocated $200,000 budget.
Future Projects
At the June 27, 2011 City Council meeting, staff presented an update to the
storm drain program. The update included a history of the program; General
Funds budgeted, and completed projects. The Master Plan of Drainage
prioritizes projects based upon the probability of flooding. Future projects
identified within the Master Plan of Drainage are as follows:
Project Estimated Cost
WE4 Electric Avenue (Marina to Main Street) $2,610,000
WE5A Marina Drive Storm Drain (Electric to PCH) $1,000,000
SG2A Marina Drive Pump Station $6,500,000
CPE1A Ironwood and Guava Storm Drain $ 540,000
CPE2A Ironwood and Elder Avenue Storm Drain $ 540,000
At the time that the $5 million Storm Drain designation was set, the CPE1A and
CPE2A projects began design. Those projects seek to upsize two 36 -inch storm
drains that lie between homes on a 10 -foot storm drain easement. This design
ended up being problematic for several reasons. First, the improvements only
Page 2
upgrade storm protection to 5 -year levels. Secondarily, the designer would not
assume liability for the design, and thirdly, the homeowners were against the
project. The Storm Drain Master Plan has an alternate design to solve drainage
in the area to provide 25 -year flood protection. The costs of those improvements
include running drainage improvements to Bluebell Park where a Storm Drain
Pump Station would be installed for a cost of $18.7 million. This cost of the
project is unfeasible.
A solution to the drainage problem has been discussed. If the City is able to
purchase one of the homes on the northern side of Ironwood Avenue between
Elder Avenue and Guava Avenue, a gravity drainage system could be
constructed. An additional study that further examined the problem has been
prepared and is attached to this report. This report studied numerous options to
improve drainage. On June 27, 2011, the City Council approved designating
$700,000 in funding toward purchase of a home on Ironwood Avenue should one
become available for purchase. There are 10 homes in this area and purchase
of any of these homes will allow a drainage system to be constructed at a lower
cost. The homes on Ironwood Avenue have been monitored and none have
been available since that time. With the funding remaining in project SD1202,
staff will continue to monitor available homes on Ironwood Avenue.
Staff will also continue vigorously in search of storm drain funding opportunities
as they arise. Grants have been applied for without success at this time. One
other solution that was discussed by the Ad Hoc Committee is funding storm
drain projects with assessed funds. Assessed funds are dedicated revenue set
up by a district formed by the voters of Seal Beach. This proposed tax is a
measure that requires each property owner to pay a certain tax based upon the
value of required storm drains. The 2008 Master Plan of Drainage outlined over
$90 million in storm drain needs.
An update will be brought forward during the budget hearings for the FY 2013 -14
budget. At that time, the Marina Avenue Storm Drain project will be in
construction and the next project can be identified.
ENVIRONMENTAL IMPACT:
There is no environmental impact related to this item.
LEGAL ANALYSIS:
No legal analysis is required for this item.
FINANCIAL IMPACT:
There is no financial impact at this time.
Page 3
RECOMMENDATION:
It is recommended the City Council receive and file the Storm Drain Program
Update and the College Park East Storm Drain Alternative Report.
SUBMITTED BY:
le/ ,e/i
Sean P. Crumby, P.E.
Assistant City Manager /Publ
Works
NOTED AND APPROVED:
tilAL
. Ingram, City
Prepared by: Michael Ho, Deputy Director PW /City Engineer
Page 4
ger
Background and Purpose
The portion of College Park East, east of Lampson Avenue and north of Dogwood Avenue drains to two
36 -inch diameter storm drains at Elder Avenue and Guava Avenue with their intersection with Ironwood
Avenue. They extend westerly through easements between residential properties, then across Lampson
Avenue, and outlet to a shallow drainage swale in Old Ranch Golf Course generally paralleling Lampson
Avenue. The existing storm drains and their tributary areas are shown on Figure 1.
These storm drains are too small to convey the design flow (peak flow from a 25 -year storm) to Old
Ranch Golf Course, which acts as a retarding basin at the upstream end of Federal Storm Channel,
Orange County Flood Control District Facility No. CO1S06. The City's Master Plan of Drainage completed
in 2009 recommended replacing the existing 36 -inch diameter storm drains with 6' (W) x 3' (H) reinforced
concrete boxes, which is the largest facility that can be fit in the 10 -ft wide easements. These projects
would increase the flood protection somewhat, but still not provide the 25 -year protection to the tributary
area. Additionally, construction might possibly damage the four residences along the two easements
(Photographs 1 and 2).
PHOTOGRAPH 1. Ironwood and Guava
PHOTOGRAPH 2. ironwood and Elder
1
City of Seal Beach
Ironwood & Guava & Elder Storm Drains
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In addition to lack of adequate space to construct proper size drainage facilities, this area is very flat and
the outlet drainage swale is very shallow, which requires the construction of shallow box culverts, instead
of deeper pipe drains. It would be possible to construct pipe drains if they terminate at a stormwater
pump station, from where the runoff can be pumped into the Old Ranch Golf Course drainage swale.
The purpose of this study is to develop and evaluate alternative projects that can provide 25 -year
protection to the tributary area of the two 36 -inch diameter pipe drains at Elder and Guava Avenues.
Project Alternatives
Originally, four alternative projects, some of which were suggested by the area residents, were developed
and evaluated. A fifth alternative, which is a variation of the fourth alternative was added and evaluated.
Alternative 1
With this alternative, one property will be purchased along the north side of Ironwood Avenue near Elder
Avenue. The drainage facilities will consist of:
• Double 5.5'Wx2.5'H reinforced concrete box (RCB) storm drain in Hazelnut Avenue and Guava
Avenue
• Two (2) 28 ft wide catch basins in Hazelwood Avenue
• Two (2) 28 ft wide, one 14 ft wide, and one 10ft wide catch basin in Guava Avenue
• Double 6'Wx2.5'H RCB storm drain in Ironwood Avenue between Guava Avenue and Fir Avenue
• A 30" diameter reinforced concrete pipe (RCP) storm drain in Ironwood Avenue east of Guava
Avenue with two 21 ft wide catch basins
• Single 11'Wx3'H RCB storm drain in Ironwood Avenue between Fir Avenue and Elder Avenue
• 36" diameter RCP storm drain in Fir Avenue with two 21 ft wide catch basins
• Transition to a triple 7'Wx3'H RCB storm drain at Ironwood and Elder Avenue
• Triple 7'Wx3'H RCB storm drain through the purchased property and across Lampson Avenue,
outletting to the drainage swale in Old Ranch Golf Course
• Single 6'Wx3'H RCB storm drain and two 28 ft wide and two 14 ft wide catch basins in Elder
Avenue, confluencing with the triple box drain in Ironwood Avenue
• A 36" diameter RCP storm drain in Ironwood Avenue west of Elder Avenue with one 28 ft wide
and one 14 ft wide catch basins, confluencing with the single 6'Wx3'H reinforced concrete box
storm drain from Elder Avenue
• Removal and reconstruction of the existing 8" diameter sewer line in Hazelnut Avenue, a portion
of Guava Avenue, and in Ironwood Avenue between Guava Avenue and west of Elder Avenue
• Removal and reconstruction of the existing 8" diameter water line in Hazelnut Avenue, Guava
Avenue, and Ironwood Avenue
The preliminary plan of Alternative 1 is shown on Figure 2. The estimated implementation cost of this
alternative is $5.95 million as detailed in Table 1.
3 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
Table 1
Alternative No. 1 - Reinforced Concrete Culvert Outlet in Single Lot
Construction Cost Estimate (March 2012)
Location
Drainage System
Length or
Each
Unit Cost
Sub Cost
Guava Avenue
'
18-inch
30 -inch RCP
65
$430
$27,950
24 -inch RCP
27
$385
$10,395
Double 5.5' W x 2.5' H RCB
430
$2,002
$860,673
Remove Exist. CB
2
$1,500
$3,000
10 -ft Catch Basin
1
$12,000
$12,000
14 -ft Catch Basin
1
$16,000
$16,000
28 -ft Catch Basin
4
$22,000
$88,000
Sewer Manhole
5
$10,000
$50,000
Modify Exist. SS Manhole
1
$4,000
$4,000
Remove Exist. SS Manhole
and Sewer Line
1
$10,000
$10,000
New 8 -inch Water Line
500
$300
$150,000
VCP Sewer
300
_ $400
$120,000
Sub - Total =
$1,352,018
Fir Avenue
36 -inch RCP
95
$470
$44,650
24 -inch RCP
37
$385
$14,245
21 -ft Catch Basin
i 2
$18,000
$36,000
Sub - Total =
$94,895
Elder Avenue
30 -inch RCP
34
$430
$14,620
24 -inch RCP
34
$385
$13,090
6' W x 3' H RCB
110
$1,067
$117,340
Remove Exist. CB
2
$1,500
$3,000
14 -ft Catch Basin
2
$16,000
$32,000
28 -ft Catch Basin
2
$22,000
$44,000
Sub - Total =
$224,050
Ironwood Avenue
36 -inch RCP
120
$470
$56,400
30 -inch RCP
135
$430
$58,050
24-inch RCP
60
$385
$23,100
Triple 7' W x 3' H RCB
278
$3,386
$941,410
Single 11' W x 3' H RCB
198
$2,180
$431,640
Double 6' W x 2.5' H RCB
233
$2,343
$545,899
Concrete Headwall
1
$30,000
$30,000
14 -ft Catch Basin
1
$16,000
$16,000
21 -ft Catch Basin
2
$18,000
$36,000
28 -ft Catch Basin
1
$22,000
$22,000
Modify and Abandon Exist. SD
and Sewer System
1
$10,000
$10,000
Modify Exist. SS Manhole
2
$4,000
$8,000
Remove Exist. SS Manhole
1
$2,500
$2,500
New 8 -inch Water Line
520
$300
$156,000
New 8 -inch Sewer Line
480
$400
$192,000
New 10 -inch Sewer Line
106
$480
$50,880
New Sewer Manhole
5
$10,000
$50,000
Sub - Total =
$2,629,879
15% Contingency =
$645,126
Property Value =
$800,000
Demolish the Building and Grade the Site =
$200,000
Grand Total = $5,945,968
5 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
The advantages of this alternative are:
1. It is the least costly alternative
2. Shallow depth of the storm drains will minimize the shoring and dewatering work
The disadvantages of Alternative 1 are:
1. Very shallow and wide drains will require closing of Hazelnut Avenue, Guava Avenue, and
Ironwood Avenue between Guava Avenue and Elder Avenue
2. The width of the facilities require relocation of water and sewer facilities along most of the storm
drains
Alternative 2
Alternative 2 is identical to Alternatives 1 and 3 in Hazelnut Avenue, Guava Avenue, and Ironwood
Avenue east of Fir Avenue. It requires acquiring seven (7) easements between properties along the north
side of Ironwood Avenue between Elder Avenue and Guava Avenue through which 36 -inch diameter
RCP storm drains are constructed, outletting to into the swale in Old Ranch Golf course, similar to the two
existing storm drains. This alternative eliminates the need to purchase property.
• Double 5.5'Wx2.5'H reinforced concrete box (RCB) storm drain in Hazelnut Avenue and Guava
Avenue
• Two (2) 28 ft wide catch basins in Hazelwood Avenue
• Two (2) 28 ft wide, one 14 ft wide, and one 10ft wide catch basin in Guava Avenue
• Double 6'Wx2.5'H RCB storm drain in Ironwood Avenue between Guava Avenue and east of Fir
Avenue
• A 30" diameter reinforced concrete pipe (RCP) storm drain in Ironwood Avenue east of Guava
Avenue with two 21 ft wide catch basins, terminating at the existing 36" RCP at the extension of
Guava Avenue
• 36" diameter RCP storm drain in Fir Avenue with two 21 ft wide catch basins, extending through
a new easement between two properties and across Lampson Avenue, terminating at the
shallow swale in Old Ranch Golf Course
• Single 6'Wx3'H RCB storm drain and two 28 ft wide and two 14 ft wide catch basins in Elder
Avenue, extending into Ironwood Avenue to just west of Fir Avenue
• A 36" diameter RCP storm drain in Ironwood Avenue west of Elder Avenue with one 28 ft wide
and one 14 ft wide catch basins, terminating at the existing 36" RCP at the extension of Elder
Avenue
•
Two 36" diameter RCP storm drains between the new 6'(W)x3'(H) RCB in ironwood Avenue and
the shallow swale in Old Ranch Golf Course, extending through new easements between
houses.
• Three 36" diameter RCP storm drains between the new double 5.5'(W)x2.5'(H) RCB in Ironwood
Avenue and the shallow swale in Old Ranch Golf Course, extending through new easements
between houses.
6 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
• Removal and reconstruction of the existing 8" diameter sewer line in Hazelnut Avenue, a portion
of Guava Avenue, and in Ironwood Avenue between Guava Avenue and Fir Avenue
• Removal and reconstruction of the existing 8" diameter water line in Hazelnut Avenue, Guava
Avenue, and Ironwood Avenue
Preliminary plan of Alternative 2 is shown on Figure 3. The estimated implementation cost of this
alternative is $6.5 million, as detailed in Table 2.
The advantages of this alternative are:
1. It is has smaller RCBs in Ironwood Avenue west of Fir Avenue, with less impact on traffic and
inconvenience to the residents than Alternatives 1 and 3
2. Shallow depth of the storm drains will minimize the shoring and dewatering work
3. Less sewer removal and replacement than Alternatives 1 and 3
The disadvantages of Alternative 1 are:
1. Requires acquisition of seven easements, which will involve 14 properties
2. Very limited space between the existing houses will make construction difficult, and may result in
damage to the structures.
3. May require the removal and replacement of the existing improvements along the new easements
if the pipe cannot be jacked across the easements
Alternative 3
This alternative is nearly identical to Alternative 1, except two lots are purchased near Ironwood Avenue
and Elder Avenue. The property can be redeveloped as a small park following construction of the storm
drain improvements. The drainage facilities will consist of:
• Double 5.5'Wx2.5'H reinforced concrete box storm drain along Hazelnut Avenue and , Guava
Avenue
• Two (2) 28 ft wide catch basins in Hazelwood Avenue
• Two (2) 28 ft wide, one 14 ft wide, and one 10ft wide catch basin in Guava Avenue
• Double 6'Wx2.5'H reinforced concrete box storm drain in Ironwood Avenue between Guava
Avenue and Fir Avenue
• A 30" diameter reinforced concrete pipe storm drain in Ironwood Avenue east of Guava Avenue
with two 21 ft wide catch basins
• Single 11'Wx3'H reinforced concrete box storm drain in Ironwood Avenue between Fir Avenue
and Elder Avenue
• A 36" diameter reinforced concrete pipe storm drain in Fir Avenue with two 21 ft wide catch
basins
• Transition to a triple 7'Wx3'H reinforced concrete box storm drain at Ironwood Avenue and Elder
Avenue
• Triple 7'Wx3'H reinforced concrete box storm drain through the purchased property and across
Lampson Avenue, outletting to the drainage swale in Old Ranch Golf Course
• Single 6'Wx3'H reinforced concrete box storm drain and two 28 ft wide and two 14 ft wide catch
basins in Elder Avenue, confluencing with the triple box drain in Ironwood Avenue
7 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
Table 2
Alternative No. 2 - Reinforced Concrete Pipe Outlet Facility
Construction Cost Estimate (March 2012)
Location
Drainage System
Length or
Each
Unit Cost
Sub Cost
Guava Avenue
30 -inch RCP
65
$430
$27,950
24 -inch RCP
27
$385
$10,395
Double 5.5' W x 2.5' H RCB
430
$2,002
$860,673
Remove Exist. CB
2
$1,500
$3,000
10 -ft Catch Basin
1
$12,000
$12,000
14 -ft Catch Basin
1
$16,000
$16,000
28-ft Catch Basin
4
$22,000
$88,000
Sewer Manhole
5
$10,000
$50,000
Modify Exist. SS Manhole
1
$4,000
$4,000
Remove Exist. SS Manhole
and Sewer Line
1
$10,000
$10,000
New 8 -inch Water Line
500
$300
$150,000
8 -inch VCP Sewer
300
$400
$120,000
Sub - Total =
$1,352,018
Fir Avenue
36 -inch RCP
95
$470
$44,650
24 -inch RCP
37
$385
$14,245
21 ft Catch Basin
2
$18,000
$36,000
Sub - Total =
$94,895
Elder Avenue
30 -inch RCP
34
$430
$14,620
24 -inch RCP
34
$385
$13,090
6' W x 3' H RCB
120
$1,067
$128,007
Remove Exist. CB
2
$1,500
$3,000
14 -ft Catch Basin
2
$16,000
$32,000
28 -ft Catch Basin
2
$22,000
$44,000
Sub - Total =
$234,717
Ironwood Avenue
36 -inch RCP
1,690
$1,500
$2,535,000
30 -inch RCP
180
$1,000
$180,000
24 -inch RCP
60
$385
$23,100
6' W x 3' H RCB
192
$1,067
$204,811
Double 6' W x 2.5' H RCB
165
$2,343
$386,581
Concrete Headwall
7
$10,000
$70,000
14-ft Catch Basin
1
$16,000
$16,000
21 -ft Catch Basin
2
$18,000
$36,000
28 -ft Catch Basin
1
$22,000
$22,000
Modify and Abandon Exist. SD
and Sewer System
2
$10,000
$20,000
Remove Exist. SS Manhole
2
$2,500
$5,000
New 8 -inch Sewer Line
240
$400
$96,000
New 8 -inch Water Line
520
$300
$156,000
Sub - Total =
$3,750,492
15% Contingency =
$562,574
Easement Cost =
$500,000
Grand Total = $6,494,696
9 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
•
•
A 36" diameter reinforced concrete pipe storm drain in Ironwood Avenue west of Elder Avenue
with one 28 ft wide and one 14 ft wide catch basins, confluencing with the single 6'Wx3'H
reinforced concrete box storm drain from Elder Avenue
Removal and reconstruction of the existing 8" diameter sewer line in Hazelnut Avenue, a portion
of Guava Avenue, and in Ironwood Avenue between Guava Avenue and west of Elder Avenue
Removal and reconstruction of the existing 8" diameter water line in Hazelnut Avenue, Guava
Avenue, and Ironwood Avenue
The preliminary plan of Alternative 3 is shown on Figure 4. The estimated implementation cost of this
alternative is $6.93 million, as detailed in Table 3.
The advantages of this alternative are:
1. It provides a wider area for construction of the triple RCB between Ironwood Avenue and
Lampson Avenue
2. The two properties purchased for storm drain construction can be developed as a neighborhood
park or sold for development with storm drain easements
3. Shallow depth of the storm drains will minimize the shoring and dewatering work
The disadvantages of Alternative 1 are:
1. Very shallow and wide drains will require closing of Hazelnut Avenue, Guava Avenue, and
Ironwood Avenue between Guava Avenue and Elder Avenue
2. The width of the RCB storm drains requires relocation of water and sewer facilities along most of
the storm drains.
3. Two properties are purchased, making this more costly than Alternatives 1 and 2, unless the
properties can be sold for development
Alternative 4
This alternative includes a stormwater pump station constructed on two lots near the intersection of
Ironwood Avenue and Elder Avenue, with storm drain pipes along Hazelnut Avenue, Guava Avenue,
Ironwood Avenue to the pump station wet well; a box culvert drain along Elder Avenue; and smaller storm
drain pipes in Ironwood Avenue and Fir Avenue. Pump station discharge pipes would extend across
Lampson Avenue, and terminate at the Old Ranch Golf Course drainage swale. The drainage facilities
will consist of:
• A 60" RCP storm drain in Hazelnut Avenue with two 28 ft wide catch basins
• A 60: RCP storm drain in Guava Avenue with two 28 ft wide, one 14 ft wide, and one 10 ft wide
catch basins
• A 66" RCP storm Drain in Ironwood Avenue between Guava Avenue and Fir Avenue
• A 78" RCP storm drain in Ironwood Avenue between Fir Avenue and Elder Avenue
• A 30" RCP storm drain with two 21 ft wide catch basins in Ironwood Avenue east of Guava
Avenue
• A 36" RCP storm Drain with one 28 ft and one 14 ft wide catch basins in Ironwood Avenue west
of Elder Avenue
10 City of Sea! Beach
Ironwood & Guava & Elder Storm Drains
Table 3
Alternative No. 3 - Reinforced Concrete Culvert Outlet in Two Lots
Construction Cost Estimate (March 2012)
Location
Drainage System
Length or
Each
Unit Cost
Sub Cost
Guava Avenue
30 -inch RCP
65
$430
$27,950
24 -inch RCP
27
$385
$10,395
Double 5.5' W x 2.5' H RCB
430
$2,002
$860,673
Remove Exist. CB
2
$1,500
$3,000
10 -ft Catch Basin
1
$12,000
$12,000
14 -ft Catch Basin
1
$16,000
$16,000
28-ft Catch Basin
4
$22,000
$88,000
Sewer Manhole
5
$1 0,000
$50,000
Modify Exist. SS Manhole
1
$4,000
$4,000
Remove Exist. SS Manhole
and Sewer Line
1
$10,000
$10,000
New 8 -inch Water Line
500
$300
$150,000
8 -inch VCP Sewer
300
$400
$120,000
Sub - Total =
$1,352,018
Fir Avenue
36 -inch RCP
95
$470
$44,650
24 -inch RCP
37
$385
$14,245
21 -ft Catch Basin
2
$18,000
$36,000
Sub - Total =
$94,895
Elder Avenue
30 -inch RCP
34
$430
$14,620
24 -inch RCP
34
$385
$13,090
6' W x 3' H RCB
132
$1,067
$140,808
Remove Exist. CB
2
$1,500
$3,000
14 -ft Catch Basin
2
$16,000
$32,000
28 -ft Catch Basin
2
$22,000
$44,000
Sub - Total =
$247,518
Ironwood Avenue
36 -inch RCP
127
$470
$59,690
30 -inch RCP
135
$430
$58,050
24 -inch RCP
60
$385
$23,100
Triple 7' W x 3' H RCB
282
$3,386
$954,955
Single 11' W x 3' H RCB
174
$2,180
$379,320
Double 6' W x 2.5' H RCB
233
$2,343
$545,899
Concrete Headwall
1
$30,000
$30,000
14 -ft Catch Basin
1
$16,000
$16,000
21 -ft Catch Basin
2
$18,000
$36,000
28 -ft Catch Basin
1
$22,000
$22,000
Modify and Abandon Exist. SD
and Sewer System
1
$10,000
$10,000
Modify Exist. SS Manhole
2
$4,000
$8,000
Remove Exist. SS Manhole
1
$2,500
$2,500
New 8 -inch Water Line
520
$300
$156,000
New 8 -inch Sewer Line
480
$400
$192,000
New 10 -inch Sewer Line
106
$480
$50,880
New Sewer Manhole
5
$10,000
$50,000
Sub - Total =
$2,594,395
15% Contingency =
$643,324
Property Value =
$1,600,000
Demolish the Buildings and Grade the Site =
$400,000
Grand Total = $6,932,149
12 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
• A 36" RCP storm drain with two 21 ft wide catch basins in Fir Avenue terminating at the 78" RCP
storm Drain in Ironwood Avenue
• Single 6'Wx3'H RCB storm drain and two 28 ft wide and two 14 ft wide catch basins in Elder
Avenue, extending into Ironwood Avenue
• An 81" RCP influent storm drain from Ironwood Avenue to the pump station Wet well
• A stormwater pump station of 166 cfs capacity constructed in the center of the two propertied
that will be purchased
• Two 42" diameter pump discharge pipes terminating at the drainage swale in Old Ranch Golf
course with flap gates
The preliminary plan of Alternative 4 is shown on Figure 5. The estimated implementation cost of this
alternative is $9.51 million, as detailed in Table 4.
The advantages of this alternative are:
1. Construction will be less disruptive due to the use of pipes instead of wide box culverts
2. This alternative may require minimal removal and relocation of existing utilities
The disadvantages of Alternative 1 are:
1. It requires purchasing two properties
2. Its implementation cost is higher than those of Alternatives 1, 2, and 3
3. Due to the deeper storm drains, the shoring and dewatering will be more extensive than for
Alternatives 1, 2, and 3
4. Pump station will require more maintenance than the first three alternatives
Alternative 5
Alternative 5 is similar to Altemative 4, except the pump station is constructed on the Old Ranch Golf
course property, and only one property needs to be purchased near Ironwood Avenue and Elder Avenue.
The influent pipe would extend through the purchased property and Lampson Avenue to the proposed
pump station site on the Old Ranch Golf Course just north of Lampson Avenue. Pump station discharge
pipes would be very short, terminating at the Old Ranch Golf Course drainage swale with flap gates. The
drainage facilities will consist of:
• A 60" RCP storm drain in Hazelnut Avenue with two 28 ft wide catch basins
• A 60: RCP storm drain in Guava Avenue with two 28 ft wide, one 14 ft wide, and one 10 ft wide
catch basins
•
•
•
•
A 66" RCP storm Drain in Ironwood Avenue between Guava Avenue and Fir Avenue
A 78" RCP storm drain in Ironwood Avenue between Fir Avenue and Elder Avenue
A 30" RCP storm drain with two 21 ft wide catch basins in Ironwood Avenue east of Guava
Avenue
A 36" RCP storm Drain with one 28 ft and one 14 ft wide catch basins in Ironwood Avenue west
of Elder Avenue
13 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
-------------------- - - - - -- - - - -- - - -- -- -------------- - - - - --
teD ? '\ \ 54
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1
Table 4
Alternative No. 4 - Pump Station Located in Two Lots
Construction Cost Estimate (March 2012)
Location
Drainage System
Length or
Each
Unit Cost
Sub Cost
Guava Avenue
30 -inch RCP
70
$430
$30,100
24 -inch RCP
33
$385
$12,705
60 -inch RCP
440
$690
$303,600
Remove Exist. CB
2
$1,500
$3,000
10 -ft Catch Basin
1
$12,000
$12,000
14 -ft Catch Basin
1
$16,000
$16,000
28 -ft Catch Basin
4
$22,000
Sub - Total =
$88,000
$465,405
Fir Avenue
36 -inch RCP
95
$470
$44,650
24 -inch RCP
37
$385
$14,245
21 -ft Catch Basin
2
$18,000
$36,000
Sub - Total =
$94,895
Elder Avenue
30 -inch RCP
34
$430
$14,620
24 -inch RCP
34
$385
$13,090
6' W x 3' H RCB
141
$1,067
$150,408
Remove Exist. CB
2
$1,500
$3,000
14 -ft Catch Basin
2
$16,000
$32,000
28 -ft Catch Basin
2
$22,000
$44,000
Sub - Total =
$257,118
Ironwood Avenue
36 -inch RCP
127
$470
$59,690
30 -inch RCP
143
$430
$61,490
24 -inch RCP
60
$385
$23,100
66 -inch RCP
227
$615
$139,605
78 -inch RCP
185
$765
$141,525
81-incg RCP
34
$815
$27,710
Double 42 -inch RCP
163
$970
$158,110
Concrete Headwall
1
$25,000
$25,000
14 -ft Catch Basin
1
$16,000
$16,000
21 -ft Catch Basin
2
$18,000
$36,000
28 -ft Catch Basin
1
$22,000
$22,000
Sub - Total =
$710,230
Pump Station 1
1 1
$5,000,000
$5,000,000
15% Contingency =
$979,147
Property Value =
$1,600,000
Demolish the Building and Grade the Site =
$400,000
Grand Total = $9,506,795
15 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
• A 36" RCP storm drain with two 21 ft wide catch basins in Fir Avenue terminating at the 78" RCP
storm Drain in Ironwood Avenue
• Single 6'Wx3'H RCB storm drain and two 28 ft wide and two 14 ft wide catch basins in Elder
Avenue, extending into Ironwood Avenue
• An 81" RCP influent storm drain from Ironwood Avenue to the pump station wet well
• A stormwater pump station of 166 cfs capacity constructed on the property to be acquired from
the Old Ranch Golf Course
• Two 42" diameter pump discharge pipes terminating at the drainage swale in Old Ranch Golf
course with flap gates
The preliminary plan of Alternative 5 is shown on Figure 6. The estimated implementation cost of this
alternative is $9.03 million, as detailed in Table 5.
The advantages of this alternative are:
1. Construction will be less disruptive to the residents due to the use of pipes instead of wide box
culverts, and locating the pump station on the golf course
3. This alternative may require minimal removal and relocation of existing utilities
The disadvantages of Alternative 1 are:
1. It requires purchasing one property between Ironwood Avenue and Lampson Avenue, and
purchase of property from the golf course
2. Its implementation cost is higher than those of Alternatives 1, 2, and 3
3. Due to the deeper storm drains, the shoring and dewatering will be more extensive than for
Altematives 1, 2, and 3
4. Pump station will require more maintenance than the first three alternatives
16 City of Seal Beach
Ironwood & Guava & Elder Storm Drains
Table 5
Alternative No. 5 - Pump Station Located at Golf Course
Construction Cost Estimate (March 2012)
Location
Drainage System
Length or
Each
Unit Cost
Sub Cost
Guava Avenue
30 -inch RCP
70
$430
$30,100
24 -inch RCP
33
$385
$12,705
60 -inch RCP
440
$690
$303,600
Remove Exist. CB
2
$1,500
$3,000
10 -ft Catch Basin
1
$12,000
$12,000
14 -ft Catch Basin
1
$16,000
$16,000
28 -ft Catch Basin
4
$22,000
Sub - Total =
$88,000
$465,405
Fir Avenue
36 -inch RCP
95
$470
$44,650
24 -inch RCP
37
$385
$14,245
21 -ft Catch Basin
2
$18,000
$36,000
Sub - Total =
$94,895
Elder Avenue
30 -inch RCP
34
$430
$14,620
24 -inch RCP
34
$385
$13,090
6' W x 3' H RCB
114
$1,067
$121,607
Remove Exist. CB
2
$1,500
$3,000
14 -ft Catch Basin
2
$16,000
$32,000
28 -ft Catch Basin
2
$22,000
$44,000
Sub - Total =
$228,317
Ironwood Avenue
36 -inch RCP
127
$470
$59,690
30 -inch RCP
143
$430
$61,490
24 -inch RCP
60
$385
$23,100
66 -inch RCP
227
$615
$139,605
78 -inch RCP
193
$765
$147,645
81 -incg RCP
257
$815
$209,455
Double 42 -inch RCP
18
$970
$17,460
Concrete Headwall
1
$25,000
$25,000
14 -ft Catch Basin
1
$16,000
$16,000
21 -ft Catch Basin
2
$18,000
$36,000
28 -ft Catch Basin
1
$22,000
$22,000
Sub - Total =
$757,445
Pump Station 1
1 1
$5,000,000
$5,000,000
15% Contingency =
$981,909
Golf Course Property Value =
$500,000
Property Value =
$800,000
Demolish the Building and Grade the Site =
$200,000
Grand Total = $9,027,971
18 City of Seal Beach
Ironwood & Guava & Elder Storm Drains