HomeMy Public PortalAbout1999 State Revolving Fund Amendment 2 Agreement CS12085002P - Collection Sewer System.tifjeb Bush
Governor
Department of
Environmental Protection
NOV 2 2 1999
Twin Towers Office Building
2600 Blair Stone Road David B Struhs
Tallahassee Florida 32399 2400 Secretary
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr C Samuel Kissinger Village Manager
Village of Key Biscayne
85 West "'chi) a St eet
Key Biscayne Flonda 33149
Re CS12085002P — Village of Key Biscayne
Collection Sewer System
Dear Mr Kissinger
We are pleased to provide financing under the State Revolving Fund loan program for
construction of your collection sewer system Enclosed is one copy of Amendment 2 to
your loan The amendment is now in effect
We congratulate you and your staff on your efforts and are pleased that we can continue
working with you on this project
If we may be of further assistance please contact Jerry Herting at 850/488 8163 or
write to Mr Herting Mail Station 3505 at the letterhead address
Sincerely
'2__
avi� Struhs
Secretary
DBS/gh/h
Enclosure
cc Peter Kory — Key Biscayne
Mike Bechtold — DEP/West Palm Beach
Protect Conserve and Manage Honda s Environment and Natural Resources
P ted on recycled pap
STATE REVOLVING FUND
AMENDMENT 2 TO LOAN AGREEMENT CS12085002P
VILLAGE OF KEY BISCAYNE
This amendment is executed by the STATE OF FLORIDA DEPARTMENT OF ENVIRONMENTAL
PROTECTION (Department) and the VILLAGE OF KEY BISCAYNE FLORIDA (Local Government)
existing as a local government agency under the laws of the State of Florida
WITNESSETH
WHEREAS the Department and the Local Government entered into a State Revolving Fund Loan
Agreement, Number CS 12085002P authorizing a Loan amount of $693 000 excludmg Capitalized
Interest and
WHEREAS the Local Government is entitled to additional fmancmg for construction related activities
in the amount of $6 798 000 excluding Capitalized Interest and
WHEREAS provisions for a Grant Allocation Assessment, as authonzed by Section 403 1835 of the
Florida Statutes and related revisions to the Loan Agreement are needed and
WHEREAS an mterest rate and a Grant Allocation Assessment rate are to be established for the
additional financing amount awarded in this amendment and
WHEREAS an Incremental Loan Service Fee shall be paid by the Local Government for the additional
financing provided by this amendment and
WHEREAS the Semiannual Loan Payment amount and the Project costs need revision to reflect
adjustment in the Loan amount and
WHEREAS the Project schedule certain definitions and other provisions of the Agreement need
revision and several provisions need to be added to reflect financing of construction related activities
NOW THEREFORE the parties hereto agree as follows
' St<bsections 10"4) 01(6) 1 01(") 1 0'('Z) 10'('4` and' 01(15) of the Agreemert are
revised as follows
(4) Capitalized Interest shall mean indebtedness accruing on the Loan before the 20 year
repayment period begins and it is included as part of the Loan principal Capitalized Interest is not
disbursed to the Local Government, but it will be amortized via periodic Loan repayments to the
Department as if it were actually disbursed Capitalized Interest will be computed at the interest
rate set for the origmal Loan amount and at the combined rate of interest and Grant Allocation
Assessment set for any incremental Loan amount awarded by amendment It accrues and is
compounded annually from the time when disbursements are made until six months before the first
Semiannual Loan Payment is due
(6) Loan shall mean the amount of money to be loaned pursuant to the Agreement and
subsequent amendments
(11) Pledged Revenues shall mean the specific revenues pledged as security for repayment of the
Loan and shall be the Revenues as defined 111 Subsection 1 01(14) as amended There are no prior
hens on these Revenues
(13) Project shall mean the planning administrative and engineering work necessary for the
Local Government to qualify for a State Revolving Fund construction loan and the works financed
by the additional funding provided by this amendment, consistmg of fmushmg all labor materials
and equipment to construct a sewer collection system in accordance with the plans and
specifications accepted by the Department for the contract entitled the Village of Key Biscayne
Sanitary Sewer System The work will be performed under three contracts
The Project is in agreement with the Sanitary Sewer Collection System Study for the Village of Key
Biscayne dated October 1997 Approval of this Project is provided by the Florida Categorical
Exclusion Notification dated July 10 1998 The Project is not an Equivalency Project as defined in
Chapter 62 503 Florida Admuustrative Code
(14) Reverues sl-ail metal the `olloi rig
(a) The Special Assessment Proceeds which shall include prmcipal, interest and penalty collections
of the special assessments levied for the Project in accordance with the Local Government s
Ordmance No 93 3 and
(b) State Revenue Sharmg Funds which shall mean all distributions and income or earnings
received by the Local Government under the State revenue sharmg program and
(c) Revenues allocated and budgeted for Loan repayment from the Local Government s General
Fund and
(d) All interest and earnings on moneys on deposit m the State Revolving Loan Repayment
Account
(15) Semiannual Loan Payment shall mean the payment due from the Local Government to the
Department at six month intervals and it is comprised of principal interest and Grant Allocation
Assessment In addition the Incremental Loan Service Fee and all associated interest are deducted
from the first two payments
2 Section 1 01 of the Loan Agreement is revised to include the following definitions
Grant Allocation Assessment shall mean an assessment expressed as a percent per annum
accruing on the unpaid prmcipal balance (including Capitalized Interest) of the additional financing
p*ov ded b} this amendment and ar fi ti*e amendn'erts I* computed similarly to the way
interest charged on the Loan is computed and is included m the Semiannual Loan Payment The
Department will use Grant Allocation Assessment moneys for making grants to financially
disadvantaged small communities pursuant to Section 403 1835 of the Florida Statutes
Incremental Loan Service Fee shall mean an origination fee assessed for the additional financing
provided by this and any subsequent amendments The fee shall be paid to the Department by the
Local Government (The Loan Service Fee paid on the previously authorized financing is included
in the Loan principal The Incremental Loan Service Fee is not )
State Revolvmg Loan Repayment Account shall mean the account into which the Local
Government shall deposit General Fund allocations for Loan Repayment and all Special Assessment
Proceeds
2
3 Sections 3 01 and 3 04 of the Loan Agreement are deleted and replaced as follows
3 01 MONTHLY ESCROW ACCOUNT The Local Government shall establish a monthly escrow
account with a Depository and begin making Monthly Loan Deposits no later than the date set forth
in Subsection 4 01(11) as amended (see page 8 of this amendment)
Beginning six months prior to each Semiannual Loan Payment, the Local Government shall make
six Monthly Loan Deposits The first five deposits each shall be at least equal to one sixth of the
Semiannual Loan Payment The sixth Monthly Loan Deposit shall be at least equal to the amount
required to make the total on deposit m the monthly escrow account equal to the Semiannual Loan
Payment amount taking into consideration investment earnings credited to the account pursuant to
Section 3 02
Any month in which the Local Government fails to make a required Monthly Loan Deposit the
Local Government s chief financial officer shall notify the Department of such failure In addition,
the Local Government agrees to budget by amendment if necessary payment to the Depaitinent
from other legal y avanable funds a'1 staiir oeco-r ig aue oefore the same become delmquent This
requirement shall not be construed to give supenonty to the Department s claim on any revenues
over prior claims of general creditors of the Local Government nor shall it be construed to give the
Department the power to require the Local Government to levy and collect any revenues other than
Pledged Revenues
3 04 LOAN REPAYMENT RESERVE ACCOUNT A Loan Repayment Reserve Account shall be
established with a Depository The Local Government shall deposit into the account the ieserve
amount identified in Subsection 4 01(15) page 8 of this amendment, no later than the date set forth
therein Loan proceeds are provided for a portion of the deposit The Local Government shall use
its own funds for the remamder of the required deposit
4 Article III of the Loan Agreement is amended to include the following sections
3 09 STATE REVOLVING LOAN REPAYMENT ACCOUNT The Local Government shall
establish the State Revolvmg Loan Repayment Account with a Depository and shall deposit all
Special Assessment Proceeds and allocations for Loan repayment from the general fund into the
account Moneys on deposit in the account shall be invested pursuant to the laws of the State of
Florida The investment earnings shall be credited to the account The withdrawal of moneys from
the State Revolving Loan Repayment Account shall be for the purpose of making Monthly Loan
Deposits for Loan repayment or for discharging the Local Government s obligations pursuant to
Section 7 01
5 Section 4 03 LOAN DISBURSEMENTS is revised by deleting the preconstruction disbursement
schedule The Department will provide actual disbursement data in account statements
6 Section 6 01 is deleted in its entirety and replaced as follows
PLEDGED REVENUE COVERAGE The Local Government shall collect Pledged Revenues each
fiscal year which together with the amount on deposit in the State Revolving Loan Repayment
Account at the beginning of the fiscal year shall equal or exceed 1 20 tunes the sum of the
Semiannual Loan Payments due in such fiscal year
7 Section 6 02 RESERVED PLEDGED REVENUES is hereby deleted m its entirety
3
8 Section 7 01 is deleted in its entirety and replaced as follows
DISCHARGE OF OBLIGATIONS All payments required to be made under this Agreement shall
be cumulative and any deficiencies in any Fiscal Year shall be added to the payments due m the
succeeding year and all years thereafter until fully paid Payments shall continue to be secured by
this Agreement until all of the payments required shall be fully paid to the Department If at any
time the Local Government shall have paid or shall have made provision for the timely payment of
the entire principal amount of the Loan interest and Grant Allocation Assessment the pledge of
and lien on, the Pledged Revenues to the Department shall be no longer in effect Deposit of
sufficient cash securities or mvestments authorized by law from time to time may be made to
effect defeasance of this Loan However the deposit shall be made m irrevocable trust with a
banking institution or trust company for the sole benefit of the Department There shall be no
penalty imposed by the Department for early retirement of this Loan
9 The following article is added to the Agreement
ARTICLE X CONSTRUCTION CONTRACTS INSURANCE AND DISBURSEMENTS
10 01 AUTHORIZATION TO AWARD CONSTRUCTION CONTRACTS
The following documentation is required to receive the Department s authorization to award
construction contracts
(1) Proof of advertismg
(2) Award recommendation bid proposal and bid tabulation (certified by the responsible engmeer)
(3) Certified copy of the Local Government s tentative award resolution
(4) Certification of compliance with the conditions of the Department s approval of competitively
or noncompetitively negotiated procurement
10 02 SUBMITTAL OF CONSTRUCTION CON 1 RACT DOCUMENTS
After the Department s authorization to award construction contracts has been received the Local
Government shall submit contractor insurance certifications and notices to proceed with
construction
10 03 INSURANCE REQUIRED
The Local Government shall cause the Project, as each part thereof is certified by the engineer
responsible for overseeing construction as completed (hereafter referred to as Revenue Producing
Facilities J to oe insured by an insurance company o companies licen,eo to do busmess m the State
of Florida against such damage and destruction risks as are customary for the operation of Revenue
Producmg Facilities of like size type and location to the extent such insurance is obtamable from
time to tune against any one or more of such risks
The proceeds of insurance policies received as a result of damage to or destruction of the Project or
the other Revenue Producing Facilities shall be used to restore or replace damaged portions of the
facihties If such proceeds are insufficient the Local Government shall provide additional funds to
restore or replace the damaged portions of the facilities Repair construction or replacement shall
be promptly completed
10 04 ENGINEERING SERVICES
A professional engineer registered in the State of Florida shall be employed by or under contract
with the Local Government to oversee construction
4
10 05 CONSTRUCTION DISBURSEMENTS
Disbursements shall be made directly to the Local Government for reimbursement of the mcurred
construction costs and related services Disbursements for materials labor or services shall be
made upon receipt of the following
(1) A completed disbursement request form signed by the Authorized Representative Such
requests must be accompanied by sufficiently itemized summaries of the materials labor or
services to identify the nature of the work performed the cost or charges for such work and the
person providing the service or performing the work
(2) A certification signed by the Authorized Representative as to the current estimated costs of the
Project that the materials labor or services represented by the invoice have been satisfactorily
purchased performed or received and applied to the project that all funds received to date have
been applied toward completing the Project and that under the terms and provisions of the
contracts the Local Government is required to make such payments
(3) A certification by the engineer responsible for overseeing construction stating that equipment
materials labor and services represented by the construction invoices have been satisfactorily
purchased or received and applied to the Project in accordance with construction contract
documents statmg that payment is m accordance with construction contract provisions stating that
construction up to the point of the requisition is m compliance with the contract documents and
identifying all additions or deletions to the Project which have altered the Project s performance
standards scope or purpose since the issue of the Department construction permit
(4) Such other certificates or documents by engineers attorneys accountants contractors or
suppliers as may reasonably be required by the Department
10 Additional financing in the amount of $6 798 000 excluding Capitalized Interest, is hereby awarded
to the Local Government
11 A combined rate of mterest and Grant Allocation Assessment of 2 56 percent per annum is
established for the additional fmancmg amount awarded m this amendment Individually the
interest rate is 1 28 percent per annum and the Grant Allocation Assessment rate is 1 28 percent per
annum
12 The estunated principal amount of the Loan is hereby revised to $7 800 700 which consists of
$7 477 800 authorized for disbursement to the Local Government, a Loan Service Fee of $13 200 to
be disbursed directly to the Department. and S309 700 of Capitalized Interest This total consists of
the following
(a) $768 800 mcludmg $679 800 authorized for disbursement to the Local Government, a Loan
Service Fee of $13 200 to be disbursed directly to the Department and $75 800 of Capitalized
Interest, at an mterest rate of 2 56 percent per annum and
(b) $7 031 900 mcludmg $6 798 000 authorized for disbursement to the Local Government and
$233 900 of Capitalized Interest, at a combined rate of interest and Grant Allocation Assessment of
2 56 percent per annum (The interest rate is 1 28 percent per annum and the Grant Allocation
Assessment rate is 1 28 percent per annum )
The total amount owed mcludmg the Incremental Loan Service Fee and associated capitalized
interest of $141 290 (see following two paragraphs) is $7 941 990
5
13 An Incremental Loan Service Fee in the amount of $132 000 is hereby assessed The fee represents
two percent of the portion of the Loan amount authorized by this amendment excluding the
associated Loan Repayment Reserve Loan proceeds and Capitalized Interest amounts that is two
percent of $6 600 000 An additional Incremental Loan Service Fee amount will be assessed for any
additional funding provided by amendment to the Agreement The fee shall be reduced if
adjustment of Project costs results m a loan decrease provided that the decrease amendment is
executed before the first Semiannual Loan Payment due date
Interest shall accrue on the Incremental Loan Service Fee at the combined rate of interest and Grant
Allocation Assessment set for the associated Loan increment until the fee is paid Incremental Loan
Service Fee interest shall be compounded annually from the effective date of this amendment until
six months before the first Semiannual Loan Payment is due at which time it is capitalized (If
additional funding is provided interest on the associated service fee shall accrue from the effective
date of the amendment providing such funds) The estimated capitalized Incremental Loan Service
Fee interest for the fee amount assessed to date is $9 290
14 Section 9 04 REPAYMENT SCHEDULE is deleted in its entirety and replaced as follows
The Semiannual Loan Payment shall be computed based upon the principal amount of the Loan plus
the Incremental Loan Service Fee and capitalized Incremental Loan Service Fee interest and the
principle of level debt service The Department will deduct the Incremental Loan Service Fee and
associated interest from the first two payments The Semiannual Loan Payment amount may be
adjusted by amendment of this Agreement based upon revised information After the final
disbursement of Loan proceeds the Semiannual Loan Payment shall be based upon the actual
Project costs and actual dates and amounts of disbursements taking into consideration any previous
payments Actual Project costs shall be established after the Department s inspection of the
completed Project and associated records
Each Semiannual Loan Payment shall be in the amount of $254 937 until the payment amount is
adjusted by amendment The interest and Grant Allocation Assessment portions of each
Semiannual Loan Payment shall be computed as apphcable on the unpaid balance of the principal
amount of the Loan including Capitalized Interest Interest (at the combined rate of Loan interest
and Grant Allocation Assessment) also shall be computed on the unpaid balance of the Incremental
Loan Service Fee and capitalized Incremental Loan Service Fee interest The interest and Grant
Allocation Assessment on the unpaid balance shall be computed as of the due date of the
Semiannual Loan Payment Until the Agreement is further amended, each Semiannual Loan
Payment will be proportionally applied, after deduction of the Incremental Loan Service Fee is
compie e of and repaymen of the amoam s o Nee on each incremental —oan amot nt at tre da e
such payment is due
Semiannual Loan Payments shall be received by the Department beginning on February 15 2003
and semiannually thereafter on August 15 and February 15 of each year until all amounts due
hereunder have been fully paid Funds transfer shall be made by electronic means
15 Section 4 02 PROJECT RELATED COSTS is revised as follows
The Local_ Government and the Department acknowledge that the actual cost of the Project has not
been determined Project cost adjustments may be made as a result of construction bidding or
mutually agreed upon Project changes An additional Loan Repayment Reserve Account deposit
will be required for any additional funding provided by amendment to the Agreement Capitalized
Interest will be recalculated based on actual dates and amounts of Loan disbursements If the Local
Government receives other governmental funding for this Project, the costs funded by such
6
governmental funding will not be financed by this Loan The Department shall establish the final
Project costs after its final inspection of the Project records Changes m Project costs may also
occur as a result of the Local Government s Pr oject audit or a Department audit
Funds disbursed m accordance with this Agreement shall be disbursed in the order m which they
have been obhgated without respect to budgetary lme item estimates All disbursements shall be
made first from the ongmal Loan amount until that amount has been disbursed The interest rate
established for the original Loan amount shall apply to such disbursements for the purpose of
determining the associated Capitalized Interest and repayment amounts The combined rate of
interest and Grant Allocation Assessment established for any additional increment of Loan funds
obligated shall be used to determine the Capitalized Interest and repayment amounts associated with
the funds disbursed from that increment
Estimated costs are as follows
CATEGORY COST($)
(1) Administrative Allowance 39 600
(2) Planning Allowance 198 000
(3) Engmeermg Allowance 422 400
(4) Construction and Demolition 5 650 000
(5) Contingencies 565 000
(6) Technical Services During Construction 345 000
(7) Start up Services 40 000
SUBTOTAL 7 260 000
(8) Loan Repayment Reserve (Loan proceeds) 217 800
SUBTOTAL (Disbursable to Local Gov) 7 477 800
(9) Loan Service Fee 13 200
SUBTOTAL (Total Disbursable) 7 491 000
(10) Capitalized Interest 309 700
TOTAL LOAN PRINCIPAL 7 800 700
(11) Incremental Loan Service Fee (including
associated capitalized interest)
TOTAL AMOUNT OWED
141 290
7 941 990
Loan proceeds for deposit into the Loan Repayment Reserve Account represent three percent of the
Loan amount excludmg the Loan Repayment Reserve Loan proceeds and Capitalized Interest
amounts that is 3 percent of $7 260 000 is $217 800 The Local Government shall use its own
funds to deposit an additional $217 800 into the Loan Repayment Reserve Account The total
deposit requirement for the Loan Repayment Reserve is $435 600
The Loan Service Fee represents two percent of the Loan amount authorized prior to July 1 1999
excludmg the Loan Repayment Reserve Loan proceeds Loan Service Fee and Capitalized Interest
amounts that is two percent of $660 000 is $13 200 The Incremental Loan Service Fee is not
mcluded in this amount because it is not part of the Loan principal The Loan Service Fee plus the
Incremental Loan Service Fee excludmg capitalized interest, total $145 200
7
16 Subsections 4 01 (11) and (12) of the Project schedule as amended are deleted and replaced and
Subsections (14) (15) and (16) are added as follows
(11) The monthly escrow account required under Section 3 01 as amended shall be established
and Monthly Loan Deposits shall begm no later than August 15 2002
(12) The initial annual certification required under Subsection 2 01(14) shall be due November 15
2002 Thereafter until the final Semiannual Loan Payment is made the certification shall be
submitted each year at the time the annual audit report is submitted
(14) Initiation of Protect construction is scheduled for February 15 2000 Completion of Project
construction is scheduled for August 15 2002
(15) A total of $435 600 shall be deposited into the Loan Repayment Reserve Account required
under Section 3 04 as amended no later than August 15 2002 Loan proceeds m the amount of
$217 800 (mcludmg $19 800 disbursed April 14 1998) are provided for this purpose The Local
Government shall use its owl finds for depositing the remaining $21 / 800 into the reserve
(16) The first Semiannual Loan Payment in the amount of $254 937 shall be due February 15 2003
17 The Local Government agrees to the followmg special conditions
(1) Loan proceeds authonzed by this amendment shall not be disbursed until after the Local
Government, by resolution m accordance with Ordinance No 99 3 establishes the preliminary
assessment roll and makes the final decision to levy the special assessments for repayment of the
Loan Certified copies of the adopted resolutions shall be submitted to the Department
(2) The Department may unilaterally annul this amendment if the Local Government has not
estabhshed the prelunmary assessment roll and made the final decision to levy the special
assessments within six months after the effective date of this amendment The Department also
may unilaterally revise the Semiannual Loan Payment amount for repayment of the preconstruction
Loan If such annulment occurs the Local Government shall immediately begm making Monthly
Loan Deposits for repayment of the preconstruction Loan and the first Semiannual Loan Payment
shall be due six months after the annulment date If the Department unilaterally annuls this
amendment, the Department will provide written notification to the Local Government
18 All other terms and provisions of the Loan Agreement shall remain in effect.
REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
8
This Amendment 2 to Loan Agreement CS 12085002P shall be executed m three or more counterparts
any of which shall be regarded as an ongmal and all of which constitute but one and the same
instrument
IN WITNESS WHEREOF the Department has caused this amendment to the Loan Agreement to be
executed on its behalf by the Secretary of the Department and the Local Government has caused this
amendment to be executed on its behalf by its Authonzed Representative and by its affixed seal The
effective date of this amendment shall be as set forth below by the Secretary of the Department
for
VILLAGE OF KEY BISCAYNE
I attest that this amendment complies with
Section 2 02 of the original Loan Agreement
and as to form and legality
Village Attorney
for
STATE OF FLORIDA
DEPARTMENT OF ENVIRONMENTAL PROTECTION
��'`L'✓�_�--�_. NOV 1.5 1999
Secretary Date
9
SANITARY SEWER
COLLECTION SYSTEM STUDY
FOR THE
VILLAGE OF KEY BISCAYNE
October 1997
PREPARED FOR
STATE OF FLORIDA
DEPARTMENT OF ENVIRONMENTAL
PROTECTION - STATE REVOLVING FUND
LOAN AGREEMENT
ON BEHALF OF THE
r
VILLAGE OF KEY BISCAYNE, FLORIDA
PREPARED BY
<_ CA P Engineering Consultants Inc
er 100 Miracle Mile Suite 300 Coral Gables Flonda 33134
(305) 461 5484 Fax (305)461 5494
PROJECT NO 3015-A
1 El F 1 C `I F- I- I
Ci
1 f i 1 --1 1-- i 9 r
TABLE OF CONTENTS
r
r
L
Location Map
Table of Contents
List of Tables
List of Figures
List of Maps
Executive Summary
Chapter
1 Introduction
2 Existing Conditions
3 Future Conditions
4 Development of Alternatives and Description of the Selected Plan
5 Implementation and Conformance
LIST OF TABLES
11
11
11
11
1
2
7
15
18
25
Table
1 Village of Key Biscayne Population Estimates and Projections 9
2 Design Population Estimate 15
3 Expected Flow 16
4 Cost Breakdown 25
LIST OF FIGURES
Figure
1 STEP System 20
LIST OF MAPS
Maps
1 Land Use Legend 3
2 Samtary Sewer Plannmg Map 4
3 Sewer Permit Activity 6
4 Dade County Zoning Codes 8
5 Soil Classifications 10
6 Topographic Reference 11
7 Existing Sewer System 14
8 Proposed Sewer Facilities Attached
APPENDIX
1 Existing Water System
2 STEP System Cost
3 Gravity / Forcemam System Cost
4 System Alternative Cost Comparison
EXECUTIVE SUMMARY
The purpose of this study is to set out a financially feasible Capital Improvement Plan(CIP) for
providing a salutary sewer collection system for the Village of Key Biscayne The residents within
the Village to be affected are those currently operating septic tanks Upon completion of the
construction of the samtary sewer system all areas of the village that previously were not served by
the public sewer system would then be able to connect The proposed public sewer system will
collect and transport the wastewater to the Virginia Key Wastewater Treatment Plant for treatment
and disposal The Central Distract Wastewater Treatment Plant (Virginia Key Treatment Plant) has
adequate capacity for the expected flows to be generated by the proposed collection system
The area to be serviced is practically built out with only four empty lots available for future
growth Most of the area is occupied by single family homes The designated planmng penod for
the collection system is 20 years to the year 2017 and the useful life of the sewer extends for
an additional 30 years to the year 2047 The Miami Dade Water and Sewer Department
(MDWASD) is the utility that will operate and maintain the collection / transmission system will
treat the sewerage and will dispose of the effluent The recommendations resulting from this study
are consistent with the County s and Village s existing collection system
The estimated capital post allowance cost associated with the construction of the collection/
transmission system is $ 7 019 919 The combined number of users to be served by the plannmg
area is 706 customers This total translates into $9 943 23 per customer The cost for operation and
maintenance of the collection system and for treatment and disposal of the effluent at Virginia Key
will be approximately $600 / per year per customer
The following actions are recommended
1 Adopt the collection system study recommendations and submit to the FDEP the adopting
resolution to accompany the collection system study report already submitted to the FDEP
2 Pursue SRF funding of the collection/ transmission system from FDEP and submit the
following ancillary documents capital financing plan with dedicated revenue hearing
mformation sewer use ordinance plans and specifications site availabihty certificate notice
of intent to permit construction mterlocal agreement with Dade County s Miami Dade Water
and Sewer Department which will operate and maintain the collection / transmission system
3 Implement the most cost effective alternative of constructing the collection / transmission
system
P'
1 INTRODUCTION
1 1 Background
The Village of Key Biscayne is in Dade County and is accessible from the north via the
Rickenbacker Causeway The planning area is located mainly in the western & central parts
of the Village The Master Plan for the Village of Key Biscayne relates the desire that those
homes currently utilizing septic tanks go to a public sewer system The master plan was
adopted by the Village of Key Biscayne on September 12 1995 and accepted by the Flonda
Department of Commumty Affaws on October 20 1995 However as a condition for State
acceptance the Master Plan mandates that samtary sewer service will be extended and made
available by the year 2006 to all presently unserved areas At the present time all of the
homes within the planning area are connected to septic tanks Many of the homes were
constructed m the 1960's It is expected that the installation of the public sewer system will
increase the value of the properties affected Most of the land use is residential except for
some commercial areas along Crandon Blvd as illustrated in MAP 1 ( See Page 2 )
7
The proposed planning area of the collection system as depicted on MAP 2 (See Page 3) is
divided into four zones The boundanes for zone 1 2 and 3 are roughly W Heather Dnve
to the North Biscayne Bay to the West Sea View/West Mashta Drive to the South and
Crandon Boulevard to the East The last zone Zone 4 hes East of Crandon Boulevard The
boundanes for Zone 4 are approximately Crandon Boulevard to the West E Heather Dnve
to the South and Ocean Drive to the East
1 2 Scope of Study and Purpose
The scope of this collection system study is described below
A Inventory existing wastewater facilities (sewer atlas information) service area
characteristics (population soil and topography) as well as environmental
conditions (e g possible septic tank contamination endangered species etcetera)
B Establish design needs for the 20 year planning period (population census
information)
C Identify and evaluate various wastewater management system alternatives to satisfy
the 20 year needs [combined gravity/forcemam sewer system status quo (do
nothing option) or Septic Tank Effluent Pumpmg System (STEP)]
D Recommend the most cost effective environmentally sound collection system
alternative to meet the 20 year needs
E Describe in detail the recommended collection system alternatives and their costs
1 d 3 e—It I
r 1 t_
LANDUSE LEGEND
Single F amily Residential
1' 1
Tw o Family Residenti al
Townho use Resid ential
Multiple Family Resid enti al
Retail Commercial
Office commercial
Ocean Resort Ho tel
Pubhc and Institutional
Se mi Public Recre ation
and Open Space
Public Recr ea tion
and Open Space
Vaca nt La nd
SCALE IN FEET
0 1000
L 1 ,I
0
4'
1tAP
SOURCE ROBERT K SWARTHOUT INC
aC.A. P. ENGINEERING CQ$SULTANTS. I>ic.
WA GE OF KEY BISCAYNE
LA ND USB
3
VILLAGE OF KEY BISCAYNE
SANITARY SEWER PLANNING MAP
JA, C A P. ENGINEERING CONSULTANTS, Inc
4,45 l.
�d , f✓i ryej' -. �ti4.a.,%, N\ ` .. ! \ ■ �1
4
1 2 Scope of Study and Purpose (contd )
F Present a schedule for implementing the recommended collection system
G Identify any adverse environmental impacts and mitigating project enhancements
H Identify a source of financing and estimate the cost per household
I Identify the institutional responsibihty for operation and maintenance of the system
J Present the study to the public at a public hearing and obtain public in put
1 3 Need
Septic tanks can contaminate the groundwater and environment after heavy rams Over
saturated poorly drained soils cannot absorb and treat wastewater from septic tanks The
soils which make up the existing dram fields due to their low permeability rates are found
to have limitations as a source of fill for septic tank absorption fields Normally organisms
m the soil would clean up the waste before it reaches groundwater but m sopped soil
wastewater will nse to the surface or back up into the household plumbing and emit foul
odors Information from the State s Department of Health and Rehabilitative Services
(H R S ) provided by the Village shows over 21 permits issued for septic tank and dram
field repairs from 1993 1996 The complaint records establish the existence of the following
problems improperly functioning septic tanks and improperly functioning dram fields (See
MAP 3 on Page 6)
bat
The septic tank systems may fail or operate inefficiently during heavy rains due to several
contnbuting factors First of all the topography of the planning area is fairly flat Secondly
as previously mentioned the dram field s soil has poor drainage capacity In addition, the
water table is relatively high further impeding the soil s drainage capacity On average only
a 2 4 feet difference m elevation exists between the surface and the water table
Consequently septic tanks and dram fields may flood and seepage could flow into the
environment endangering the health and safety of the residents Thus there is a need for the
elimination of the existing septic tank system in order to protect public health by eliminating
the nsk of environmental problems In fact the DEP and DERM recommend the use of a
sanitary sewer especially on a barrier island
There also exists financial reasons which suggest the septic tank systems should be
eliminated For example there is a potential loss of real estate property values for those
homes/ lots not serviced by a mumcipal sanitary sewer system A lot serviced by a municipal
sanitary sewer may provide the opportunity for the construction of a larger home
Furthermore HRS regulations are subject to amendment and the change generally becomes
more regulatory and more restrictive Finally although the sanitary sewer system has a
definite financial impact on residents in the short term the investment should be returned
m the very near future
VILLAGE OF KEY F3ISCAYNE
SEWER PERMIT ACTIVITY
kP 3
PERM IT LOCATION
6 /95 335 Atla ntic Road
16/94 50 Wes t Ya shta Drive
2/95 755 Harbor Drive
0/96 820 Harbor Dr ive
14/95 740 Yyrtlewood lane
0/96 725 Gle ar idge Roa d
)8/95 773 Ridge wood Roa d
10/95 726 Ridge wood Road
L1/95 736 Ridge wood Ro ad
10/95 738 Ridgewood Ro ad
L1/93 878 Hampton Lan e
)8/95 We st 1[ctntyr e Stre et
)8/94 G lenr idge Ro ad
L0/95 Warr en Lane
L0/95 Woo dcreat Roa d
1/98 525 ltoo dc reat Ro ad
7/98 Gle nr idge Road
8/98 415 Hampton Lane
8/98 212 W IIashta Ro ad
8/98 748 R oo dcre at Roa d
8/98 875 Allenda le Road
PLANNING ZONES
73J
820
E1 k
ZONE
ZONE 2
ZONE 3
ZONE 4
Info rmation pro vided by the Vill age of Key Biscayne
an the Florida State Department of Health and Reh abilitative Ser vices (H R S )
/AC A P ENGINEERING CONSULTANTS . Inc
6
2 EXISTING CONDITIONS
2 1 Population and Land Use
The population in the planning area is currently estimated to be 1 578 This number was
calculated using the 1990 census data from the U S Census Bureau and the population per
household from the Village s Master Plan The Village Master Plan assumes that there are
2 3 people/home There are 686 existing residential homes in the planning area The 2 3
persons/home factor from the Village s Master Plan does not take into consideration any
difference in population occupancy that may or may not exist between the different types
of residential zoning found within the planning area
6
�-J
0.4
r
The Village of Key Biscayne is divided into two tracts 46 01 and 46 02 The estimated and
projected populations for the Village are shown in Table 1 (See Page 9) The planning area
lies pnmanly in tract 46 01 or the westerly tract The 1995 population for tract 46 01
according to Table 1 was 5 856 The population projection for tract 46 01 by year 2015
(two years pnor to our design year of 2017) is 7 855 people Therefore according to Table
1 the population for Tract 46 01 is expected to grow approximately 34% between 1995 and
2015
Assuming the 34% growth rate for the planning area the population of the planning area is
expected to be approximately 2115 by the year 2015 This percentage of growth however
is not expected because the planning area is practically built out In fact only four empty
lots RU 1 residential zoning remain within the planning area. Therefore an increase in
population caused by new homes being built will not be of significant impact
Very little or no change is expected to occur to the actual homes lying inside the planning
area No changes in the Dade County Zoning within the plannmg area are expected at this
time A total of 4 empty lots were found to exist within the planning area Changes in the
single family units will probably consist of the demohtion of existing homes to construct new
ones or remodehng / expansion of the existing facilities Those residential units used for
vacation purposes will probably expenence some seasonal population peaks The occupancy
of the commercial units will depend on the use and popularity of the particular business ( See
MAP 4 on Page 8)
7
VILLAGE OF KEY BISCAYNE
DADE COUNTY ZONING CODES
IIIIIIIIIIIIIII
Pen
BU -1
BU -1A
BU -2
EU-M
GP
GU
RU -1
RU -2
RU -3M
RU -4
RU -4A
RU -4L
RU -4M
1 I I I I I I I I I I I I I i I I I I 1 1 1 1 1 1 1 1.1
II III 1 11 1 1 I�IIII I N I 1 111111 1 1 1 1 1JII 11
11111111 1 1 1 1 i 1 1 1 1 1 I I II III#III 1 11111 1111111 1 111111 1
1 1#111#1111 1111111111#1111 II 1 1 1 1 1 111 11111
I l l l l l l l l i l I I I I I 1 1 1 1
1 1 1 1 1 1 1 1 1 I. .I.I #.1.1. 1.1. .1.1 .1 ..
1 # 1 1 1 1 1
,111 1111 11 1 1 11 1 1 1 1 1
11
11111111 1 1 1 1I I I I.1 1 11 1 1 1#1 1
r C A P ENGINEERING CONSULTANTS. Inc
8
TABLE 1
VILLAGE OF KEY BISCAYNE
POPULATION ESTIMATES AND PROJECTIONS 1970 TO 2015
DADE COUNTY BY AREA AND CENSUS TRACT
TRACT
YEAR
1970
YEAR
1980
YEAR
1990
YEAR
1995
YEAR
2000
YEAR
2005
YEAR
2010
YEAR
2015
46 01
1 222
3 131
5 397
5 856
6 492
7 028
7 643
7 855
46 02
3 397
3 206
3 457
3 477
3 600
3 809
4 061
4148
TOTAL
4 619
6 337
8 854
9 333
10 092
10 837
11 704
12 003
( INFORMATION TAKEN FROM U S BUREAU OF THE CENSUS CENSUS OF POPULATION FOR 1970
1980 & 1990)
(ALL OTHER YEARS FROM METRO DADE COUNTY DEPT OF PLANNING DEVELOPMENT AND
REGULATION PLANNING DIVISION 1996)
Existing land use m the planning area is dominated by single family residences with some
multifamily units and commercial buildings distributed within the area There are approximately
604 existing single family units (RU 1 Dade County Zoning) within the area As noted earlier the
four empty lots are zoned as RU 1 The single family homes are found mostly in zones 1 2 and
3 The multifamily units consist of RU 4L (Lmuted Apt. House 23 units / net acre) and RU 2 (Two
Family Residential 7 500 sq ft. net) Dade County Zoning A total of 56 RU 4L and 26 RU 2
housing units are found within the planning area The RU 4L units are found in Zone 4 The RU 2
housing units are found in Zones 2 and 3 Finally the commercial buildings are found along the
West Side of Crandon Boulevard They correspond to Zones 2 and 4
2 2 Soils. Geology. and Groundwater
Soil information has been provided by the U S Department of Agriculture s Soil
Conservation Service There are two soil types that occur within the service area The
predominant soil type is Urban Land. Urban land is defined as an area where more than
85% of the surface is covered by some man-made structure The other soil type found withm
the service area is Canaveral Sand Canaveral Sand is found to have limitations as a source
of fill for septic tank absorption fields (See MAP 5 on Page 10)
The topography of the service area is nearly level and varies in elevation from 4 ft to 6 ft
above mean sea level (See MAP 6 on Page 11) The water table below Key Biscayne is
influenced by tidal waters
9
7
VILLAGE OF KEY BISCAYNE
SOIL CLASSIFICATIONS
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/a C A P ENGINEERING CONSULTANTS. Inc
ralT tam AT warm !GMAaY LIE 6 ILL MOOS Sl IE MC
SOILS LEGEND
1\\\\I15 URBAN LAND
39 BEACHES
45 CANAVERAL SAND
INFORMATION FROM USDA NATURAL RESOURCES CONSERVATION SERVICE
10
VILLAGE OF KEY BISCAYNE
TOPOGRAPHIC REFERENCE
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/! C A P ENGINEERING CONSULTANTS. Inc
11
2 2 Soils. Geology. and Groundwater (contd from Page 9)
530
11.1.9
7
The average mean high water elevation is 2' above mean sea level The average percolation
rate of the soil in this area is only 0 00001 cubic feet per second which is a very poor
exfiltration rate
There are no pnme aquifer recharge areas within the Village of Key Biscayne The
groundwater in the planning area is not used for human consumption The well fields and
aquifers recharge areas for the Village s water supply are located on the mainland
2 3 Surface Water Hydrology
The existing storm water management systems for the Village are a combination of positive
drainage systems exfiltration trenches and drainage wells with emergency outfalls Most of
the planning area had no drainage infrastructure in place pnor to 1995
A positive drainage system with drainage wells and emergency outfalls is presently under
construction in the planning area. A senes of drainage wells with pollution control strictures
have / or will be constructed These wells will be interconnected with the wells typically
being 24" in diameter and approximately 150 deep This new system will reduce flooding
and improve the quantity and quality of the storm water discharge Finally the planning
area is urbanized and does not have any drainage canals lakes or nvers
2 4 Wetlands. Floodplams and Prime and Unique Farm Lands
The planning area does not contain any wetlands However significant mangrove wetlands
exist north of the north boundary of the Village The wetlands are located in Unincorporated
Dade County (DERM Wetland Junsdiction Areas)
The only environmentally sensitive area in the Village is the coast line Loggerhead turtles
nest on the beaches and manatees are found in the bay
According to the Federal Emergency Management Agency Flood Insurance Rate Map
(FIRM) the entire planning area is within the 100 Year Floodplam Zone AE The base flood
elevations ( for Zone AE ) in the planning area are 9 and 10 feet above sea level This means
that any new construction in the planning area must have a finish floor elevation above the
base flood elevation
The U S Soil Conservation Service Maps show no prime or unique farm lands in the
planning area
2 5 Existing Water and Wastewater Systems
2 5 1 Water System
The Village of Key Biscayne receives its water from Miami Dade Water & Sewer
Department lures The area is served via two main trunk lines a 24 -inch and a 12
mch line The two lines run along Crandon Boulevard in a southerly direction. The
12
PAM
2 5 1 Water System (contd )
homes in the service area are fed by mains and submams feeding off the trunk lines
For more detailed information on the facilities a figure showing the existing water
lures has been provided (See APPENDIX MAP Al)
2 5 2 Wastewater System
Wastewater m the service area is handled by septic tanks and dram fields The area
surrounding the service area is served via a public sewer system The public sewer
system consists of gravity lines/force mains (See MAP 7 on Page 14) The Central
Distract Combmed Wastewater Treatment Plants handled an influent flow of 150 5
million gallons per day (mgd) in 1995 The owners or residents served by septic
tanks are held responsible for the maintenance and operation of their respective
septic tanks
Problems have been found with some of the septic tanks and the dram fields within
the plannmg area The existence of the problem is seen m the number of permits
pulled to perform work on the septic tank systems In fact records provided from
the Village of Key Biscayne show fourteen permits involving dram field repair and
two for septic tank repair ( solely between 1993 and 1995) Some of the problems
experienced with the septic tanks have been septic tank failure and dram field
failure Two possible major problems occurring during heavy rams are effluent
percolating to the surface and bad odors due to septic system backups into homes
caused by insufficient dram field soil capacity
4 7 Summary- Reasons Why Septic Tanks Should Be Eliminated
7
L
plitmt
i
A Septic tanks may contaminate groundwater and the environment after heavy rams due
to the high water table and poor soil percolation
B Failure of septic tanks(over 21 permits issued for septic tank and dram field repairs
from 1993 1996
C The State approved Master Plan requires the installation of a municipal sanitary
sewer system by the year 2006 for those areas serviced by septic tanks
D There is a potential for loss of real estate property values for those homes / lots not
serviced by a municipal sanitary sewer system
E HRS regulations are subject to constant amendment and the change generally
becomes more regulatory and more restrictive
F A lot serviced by a municipal sanitary sewer may provide the opportunity for the
construction of a larger home
G Although the sanitary sewer system has a definite financial impact on residents in
the short term the investment should be returned m the very near future
H Environmental consideration DEP and DERM recommend samtary sewer especially
on a barrier island
13
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1
41
ct
4
b
re/TY LIMITS AT NORTN BOUNDARY LINE OF BILL BAGOS STATE PARK
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3 FUTURE CONDITIONS
L
7
31
Design Flows
The population of the entire Village for the planning year 2017 is approximately
12 000 The present estimated population for the planning area is 1578 people The
planning area build out population projection for the design year year 2017 is 2 398
people This population estimate was made by taking the total number of available
units of each type of residential zoning found within the planning area and
multiplying it by its respective number of people per household sewer system design
figure (this calculation is further explained in TABLE 2 below) The population in
the planning area for design purposes is expected to grow approximately 52%
between the 1997 and 2017 population estimates The change between the two
figures is due to the fact that the sewer design factors are conservative by nature
That is these factors need to be conservative (high) in order to take future sewage
demands into consideration It is important to remember that the proposed sewer
system will meet the year 2017 demands placed on it and is expected to meet the
demands placed on it for an additional 30 years ( to the end of the collection system s
life span ) The following design population occupancies were assumed 3 5 persons
per single family residence and 2 5 persons per multi family unit residence (RU -4L
& RU 2) The most conservative of the sewer design factors is that for the RU 1
single family zoning The major difference between the two population totals for
1997 and 2017 is influenced primarily by the dramatic difference between the RU 1
population figures
TABLE 2
Dade
County
Zoning
Present
Number
of Units
Present
Assumed
Occupancy
(persons/unit)
Estimated
Present
Population
(Persons)
Future
Number
of Units
Future
Assumed
Occupancy
(persons/umt)
Estimated
Future
Population
(Persons)
RU 1
604
2 3
1 389
608
3 5
2 128
RU -4L
56
2 3
129
56
2 5
140
RU 2
26
2 3
60
26
5 0
130
stamated present population = 1,578
3 I Design Flows (contd )
Estimated Future Population = 2,398
The total expected daily flow by planning area build out is 613 806 25 gallons
(See TABLE 3 on Page 16)
15
TABLE 3
EXPECTED FLOW
Project Name Collection System Study ( for the Village of Key Biscayne )
Project Number 3015
Prebminary Sewage Flow Calculation (Break Down)
i
Dade County
Residential
Zoning
Respective
Number of
Units
Average Daily Flow
Average
Flow
(GPD)
Peak
Factor
Total
Expected
Flow (GPD)
RU 1
608 units
350 gpd/ unit
212 800
2 5
532 000
RU 4L
56 units
250 gpd/ unit
14 000
2 5
35 000
RU 2
26 umts
500 gpd/ unit
13 000
2 5
32 500
otal Expected Residential Flow Volume(GPD)= 599,500
r�
BU -1
Zoning
Respective
Number of
Units
Average
Daily Flow
Average
Flow
(GPD)
Peak
Factor
Total
Expected
Flow (GPD)
Gas Stations
1 unit
450 gpd/ unit
450
2 5
1 125
Shoppmg
Centers
4 125 sq ft
10 gpd/ 100
sq ft
412 5
2 5
1 031 25
Offices
48 600 sq ft
10 gpd/ 100
sq ft
4860
2 5
12 150
otal Expected BU -1 Zonmg Flow Volume(GPD)= 14,306 25
Total Expected Flow Volume for Planning Area(GPD)= 613,806 25
16
axed
3 1 Design Flows (contd from Page 15)
140.
r
A copy of the expected daily flows and a site plan of the proposed facilities was
provided to DERM for their review and comments DERM responded that the
Central District Wastewater Treatment Plant has the capacity to handle the calculated
flow for this planning study However DERM also related that final certification of
adequate/inadequate capacity would be determined by the agency at time of review
of presented plans (during the Design Phase) The flow values were calculated
assuming the planning area will be completely built out That is the four vacant lots
remaining will be developed The flow for RU 1 zomng was amved at using a 3 5
person / household and a 100 gallons/person days production rate The average
amount of flow produced by the single family residents is expected to be 532 000
gallons The multifamily residents affected are those residing m RU 4L and RU 2
housing The affected number of umts of each type of zoning are 56 and 26 umts
respectively The production rate assumed for the RU 4L residents was 250 g p d
/ unit The corresponding flow volume turns out to be 35 000 g p d Those
residential umts in the RU 2 zomng are expected to contribute at a rate of 500 g p d
/ unit There contributory flow volume is 32 500 gallons A peak factor of 2 5 was
assumed for calculating all residential and business flow volumes The volume
produced by the business zomng BU 1 is expected to be 14 306 25 gallons per day
17
4 DEVELOPMENT OF ALTERNATIVES AND
DESCRIPTION OF THE SELECTED PLAN
41 General
Three alternatives for the collection system have been considered m this study The three
alternatives are
1 Status Quo (Septic Tanks To Remain)
2 Septic Tank Effluent Pumping System (STEP)
3 Mixed gravity / force main sewer system
The systems were compared and required to meet approval at each of several levels of
analysis First the systems should meet requirements of the Village of Key Biscayne Master
Plan Secondly the system needs to be technically and physically feasible That is the
required land and technology have to be economically available Finally all alternatives
passing the first two tests were analyzed using present worth economic analysis
The system chosen for implementation is the most cost effective choice The following
considerations were taken into account in computing the present worth of alternatives
Ala
A Planning penod of 20 years
B Discount rate of 7 375%
C Capital Costs (construction engmeenng legal fiscal and adnumstrative
costs)
D Operation and Maintenance Costs
E Salvage Value based on useful lives of vanous project components ( land
permanent conveyance including piping and structures 50 years and
equipment including pumps 20 years)
F Public acceptance of each of the alternatives
4 2 Status Ouo
This alternative includes the continued use of existing septic tanks and dram fields The
continued use of the septic tank system would create no new costs at the present time to the
Village However additional costs would be incurred upon failure of the existing septic tank
systems
18
4 2 Status Ouo (contd )
Status Ouo Analysis
The existing system has proven to have occasional problems Furthermore the system is
an aging one Therefore it is a logical assumption that the frequency of septic tank /
dram field failures thus the need for repairs will increase Continuing costs associated
with the status quo option mclude (1) Cleaning of the septic tank (2) Replacing /
maintaining dram field and (3) Replacing detenorated septic tanks Furthermore any
and all of these costs would fall directly on the property owner Besides the continued
costs previously mentioned the problem of effluent percolating to the surface and the bad
odor associated with it during heavy ram falls would not be eliminated Finally and
most important of all the do nothing alternative will not satisfy the requirements of the
Village s Master Plan As a result the status quo option is not considered as a viable
alternative
r
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r
4 3 Septic Tank Effluent Pumping System (STEP)
This is a pressure sewer system In this alternative a dual submersible pump system
would be installed inside the septic tank The septic tank would continue to be in use
but the dram field would be abandoned As flow is received in the septic tank the solids
settle at the bottom and would be removed penodically The flowable effluent from the
septic tank instead of going to the dram field would be pumped by the submersible
pump to the low pressure small diameter service connection lines which would then
feed into larger diameter pressure mains in the street The pressure main in turn would
convey the flow to the main pump stations from where the flow is pumped to the Virginia
Key Wastewater Treatment Plant (See FIGURE 1 on Page 20)
Septic Tank Effluent Pumping System (STEP) Analysis
The STEP system alternative would eliminate the problem of effluent percolating to the
surface and the associated bad odor which may occur dunng heavy ram falls However
some septic tanks would have to be replaced due to their detenorated condition or to
accommodate the pump system In addition this option would incur costs to the residents
of maintaining / cleaning of septic tanks and pumps installation of the dual on site pump
system installation of on -site electrical system installation of lateral (force main) and
connection fee The average expected life of a typical single step pump is from 18
months to 3 years The expected life of a dual pump set up is approximately 5 years In
the dual pump set-up the pumps work in an alternating basis This set up allows time
for replacement in the event that one pump fails since theoretically both pumps will not
fail at the same time As a result, we considered the dual pump set up in our cost analysis
( See APPENDIX) This option has a lower initial cost than the gravity / forcemam
alternative However analysis shows that this advantage is lost when considering the 20
year design penod (See APPENDIX) This is the case since the pumps would need to
be replaced approximately 3 times dunng the design span ( up through year 2017 )
19
1
1
1
1 V-1 I- 1 [ J
9
1
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9
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k
1
1
FIGURE 1
0
0
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L
FIN GRADE
POWER STAND---__. _
PATIO
STONE
el_
L L —III,{
s 1_,��� ���, 11
� flI=u1=111 ;I
-ril 111- I
CLEAN
OUT
PVC CONDUIT T0_,
TANK POWER STAND
PRESSURE SEWER
PIPE
SUMP PUMP
CHAMBER �____ ._
PUMP
EXIST
SEPTIC TANK
0
1
M
I
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in
STEP SYSTEM
N TS
20
4 3 Septic Tank Effluent Pumping System (STEP) Analysis (contd from Page 19)
The Miami Dade Water and Sewer Department is not organized for managing a system
with wet wells and force mains in easements on private property The Village would be
responsible for maintenance of the system
Advantages and Disadvantages of STEP System
Advantages
1 Low Construction Costs
2 No infiltration/ exfiltration
3 STEP systems reduce gnt grease and solids present in wastewater flow
4 Shallow sewer depths
5 Cleanouts used instead of manholes
Disadvantages
1 Multiple pumping units required
2 Relatively high operation and maintenance requirements
3 STEP systems require periodic cleanmg of septic tanks and disposal of septage
4 Individual services susceptible to power/ pump failures (unless overflow storage is provided)
5 Potential odor/ corrosion problems
Cost Summary
Capital costs (fundable with SRF momes) = $2 853 620
Present Worth ( SRF and customer charges over 20 year design penod ) = $13 829 970
L
21
4 4 Gravity Sewer System
A gravity sewer system consists of a network of pipe lines manholes laterals and lift /
pump stations with force maws The house laterals feed the gravity sewer lines Pipe
flow criteria will be taken into account at the time of design The pipe lines are designed
such that their slope maintains a self cleansing wastewater velocity of at least 2 feet per
second Gravity hnes force effluent to travel along pipes / manholes until reaching the
deepest manhole for a particular system Here the gravity system terminates and the force
(pressure) system begins The deepest manhole corresponds to the wet well of a pump
station A pump forces the effluent from the structure into a force (pressure main) which
takes the effluent on its way to the treatment plant
Monetary Factors
MTH
tusrt
lzmu
Although the initial capital costs are higher for this alternative than for the other two this
alternative was chosen as the best of the three The reasons for choosing this alternative
are several First this alternative is the type of public sewer system bemg utilized
throughout Dade County As a result an agency to operate and mamtarn this type of
system currently exists the Miami Dade Water and Sewer Department This would not
leave the maintenance of the system up to the 706 individual customers therefore
making the system more reliable This option will prove to be more maintenance free
than the S 1'l:P system alternative Therefore the maintenance costs associated with this
alternative will be lower Furthermore this system while representing a higher initial
system cost corresponds to a lower cost up front for property owners The costs to be
paid directly by the property owners for the gravity / force main system is approximately
$4 600 while the costs for the STEP system is approximately $5 100 In addition, this
alternative conforms to the Village s Master Plan that the entire Village have a public
sewer system by the year 2006 Finally this would eliminate the threat of the possible
health / contamination problems associated with septic tanks
Non monetary Factors
Both systems will utilize dual pumps for reliability However the pumps in the gravity
sewer system will be maintained by MDWASD and the STEP system pumps will be
maintained by the individual home owners Secondly implementing the gravity sewer
system will be easier because the MDWASD operates and maintains this type of system
Thirdly the equipment would be compatible with the equipment currently bemg used m
the Village However the STEP System would will be easier to construct because of the
high ground water table Finally both systems will benefit the environment by
eliminating the existing drainfields The STEP System will have no infiltration/
exfiltration while the gravity sewer may mtercept and dram groundwater if not properly
constructed
22
Proposed Facilities
The proposed sewer facility for the Village of Key Biscayne planning area is shown m
the inside cover (See ATTACHED 24 X 36" PLAN) The project will consist of the
following
Tic
Pea
A 46 000 L F of 8 D I P forcemam gravity sewer and appurtenances
B 4 Lift Stations
C 19 650 L F of 6" D I P forcemam and service laterals
D 5000 L F of 8" 12" and 24' DIP force main
E Abandoning 706 septic tanks and
F Repairs to streets drive ways and landscaping
Cost to Construct Facilities
The details of the gravity / force main system s cost is presented in the APPENDIX The
following tabulation shows the construction related costs for Items A through F from above
Construction (mcludmg contingency)
Engineenng & Inspection
PRESENT WORTH (For SRF monies and customer charges over 20 years )
4 5 Cost Reduction Considerations
_$ 6 215 000
_$ 767 400
4 12,584,96576
The proposed collection system is expensive The following methods were looked at to
lower the project cost.
A Use Low Cost Materials The use of alternative matenals to minimize the
construction cost was considered The system will be donated to the Miami Dade
Water and Sewer Department. The type of matenal to be used in the project will be
determined during the design phase Therefore for planning purposes the materials
selected were consistent with those required by the MDWASD on current projects
withm the Village of Key Biscayne The material bemg used is polywrapped D I P
or C 900 pipe
23
B Implement other Low Cost Alternatives The Step System while having a lower
capital cost was found to be unacceptable The reasons for this system proving
unacceptable were stated in Section 4 3 Other low cost alternatives such as a
grmder pump would be unacceptable for similar reasons Therefore these other low
cost alternatives were not explored in the cost effective anlaysis by the Village
C Reduce scope of project The scope of the project can be reduced and the
construction phased to reduce the initial cost The ultimate cost however will be
more because the entire area needs to be sewered The contract administration and
construction cost will increase if the work is phased Besides the existing system
needs replacement due to its deteriorated condition
D Other Sources of Fmancmg Alternate sources of financing the project are available
but the interest rates are greater than that available from the State of Honda
Revolving Fund Program (SRF) administered by the Honda Department of
Environmental Protection (I-DEP) A loan apphcation has been made and the funds
are immediately available
4 6 Environmental Impacts of Proposed Facilities
Long Term Impacts
A No significant adverse effect on either air or water is anticipated
B No wildlife habitat will be affected ( the planning area is Urbanized )
C No effect on threatened or endangered animal or plant species
D No archaeological or histonc sites are found in the planning area
Short term Impacts
r
L
r^
There will be some short term impacts dunng construction. For example these impacts will
include an increase in noise levels and an increase m the amount of airborne particulate
matter (dust etc) Furthermore there will be some interference with motor vehicle traffic
due to lanes being closed dunng construction detours or traffic control around construction
areas and movement of construction vehicles and equipment Erosion and sedimentation
may occur during construction grading due to rainfall on the site Control measures will be
implemented throughout the construction phase to attempt to alleviate the situation as much
as possible For instance effective maintenance of traffic plans will be evaluated and
implemented and the construction areas will be watered if dust is excessive or at an
unacceptable level The long term effects of the project however will prove beneficial to
24
the Village residents Specifically the benefits can be seen m the ehmmation of
contamination problems which can result from detenorated septic tank systems
atm
25
5 IMPLEMENTATION AND CONFORMANCE
5 1 Implementation
1 Financial Planning
The Department s State Revolving Fund (SRF) loan is expected to be the
financing source for the project A capital financing plan (CFP) will be
prepared and the public will be informed during a dedicated revenue hearing
of the financial impact of the project on the users of the sewer system The
dedicated revenue is to be repaid by a special assessment The total cost
associated with the construction of the collection / transmission system is
estimated to be $7 019 919 or $9 943 23 per customer Table 4 below
shows the break down for the project costs
TABLE 4
ITEMS
TOTAL PRECONSTRUCTION PROJECT COSTS
Construction demolition equipment
and materials
$5 650 000
Contingencies
$565 000
Technical services during construction
$345 000
Startup services
$40 000
Loan repayment reserve (incremental)
$198 000
Loan Service Fee (incremental)
$132 000
Capitalized Interest (incremental)
$89 919
TOTAL POST ALLOWANCE
PROJECT COSTS
$7,019,919
1 Financial Planning (contd )
Abandoning the septic tanks and installing house service laterals is equivalent
to an average of $1950 per residential customer The permit fees correspond
to $50 per customer The MDWASD one tune connection fee corresponds
to $2 000 per residential customer These three fees amount to $4000 and
compromise the up front costs to a residential customer
Based on the SRF loan amount of $7 019 919 for the collection/transmission
system ( with an interest rate of 2 56%) the annual payment due would be
26
5 1 Implementation (contd )
1 Financial Planning (cont d)
$452 784 78(with interest) or an average of $641 34 per customer
per year
The annual operation and maintenance cost for the collection /
transmission system is equivalent to an average cost of $600 per
residential customer This cost will be reflected in the customers water
& sewer bill
2 Public Participation
An advertised public hearing will be held to obtain comments from the
public A thorough explanation of the proposed project costs for the
collection / transmission system and for the homeowner will be provided
The timing of construction and the benefits of the proposed system will be
explained Public input is expected and will be considered at the Village
Meeting before the collection system study receives final approval
rim
3 Governmental Review
Copies of the study were sent to the FDEP Office of the Governor (State
Cleannghouse) and the Regional Planning Commission for their review In
order to qualify for a subsidized SRF loan the FDEP must be satisfied with
the plan the Village is proposing to solve its sewage collection problem
Upon approval of the collection system recommendations by the Village the
adopting resolution must be sent to the FDEP
4 Implementation Responsibility
The Mianu Dade Water and Sewer Department will have the responsibihty
of operating and maintaining the system Furthermore MDWASD will
receive and treat the sewage and dispose of the effluent
r
L
27
7
5 1 Implementation (contd )
5 Implementation Schedule
Sewer Use Ordinance Completed Apnl 1997
Dispute Resolution Process Completed April 1997
Capital Fmancing Plan July 1997
Public Hearing July 1997
Collection System Study July 1997
Interlocal Agreement Oct 1997
Environmental Information Document Oct 1997
Authonzation For Design Dec 1997
Design of All Project Aug 1998
Certification of Site Availability Sep 1998
Authorization to Incur Post Allowance of Project Cost Oct 1998
Advertise For Construction Bids Dec 1998
Start Construction Feb 1999
Complete Construction Feb 2000
5 2 Conformance
1 The engineenng aspects of the selected alternative are in conformance with applicable
provisions of Honda Administrative Code Chapter 17 503
2 The recommended actions are consistent with the comprehensive plan of the Village
of Key Biscayne and Dade County
AWN
it
f
79
28
APPENDIX
r 9 3 LI L _4
Bell.
OPP
I
�Yrit)
.a ( ) — PEE,
r -
1
0
0
40
4
-C A P ENGINEERING USING WATER slsrEM
- 100 MIRACLE MILE SUITE 300 CVILLAGE OF KEY BISCAYNE
Nava 31VLs soave iile jo 3Nn AHVUNfloe NINON 1V SLIwn Allo-1
uu ooc (++ae) NM
(1n X I)
1
STEP SYSTEM COST ESTIMATE
Zone1 8725 --15
Zone2 11115 LF
Zone 3 16902 LF
Zone 4 7285 LF
Late Is 6 DIP at an ave age of 25 of p pe per un F
RU -1 608 UNITS
RU -4L 56 UNITS
RU -2 26 UNITS
BU -1 16 UNITS
Late als 6 DIP 706 Total Units
In summary
45000 LF OF4 DIP (LOW PRESSURE FORCEMAIN)
52950 LF OF15 PVC(LATERAL)
OF WHICH 17650 LF ARE FUNDABLE BY S R F
2000 LF OF 4 DIP (FORCEMAIN)
1000 LF OF 6 DIP (FORCEMAIN)
1000 LF 8 DIP (FORCEMAIN)
3000 LF 12 DIP (FORCEMAIN)
BREAKDOWN
PIPE
DESCRIP OTT PRICE PER UNIT UNIT/INSTALL TOTAL
15 PVC 17650 $ 300 $ 750 $ 13237500
4 DIP 47000 $ 1350 $ 2450 $1 151 500 00
6 DIP 1000 $ 1969 $ 3000 $ 3000000
8 DIP 1000 $ 22.75 $ 44100 $ 4000000
12 DIP 3000 $ 3693 $ 55.00 $ 16500000
TOTAL $1518,87500
PUMP STATIONS
DESCRIP
SUBMIRSIBLE PUMP
PAVEMENT REST
DESCRIP
ASPHALTIC CONCRETE
OOSTFOR RESIDENTS
PIPE
PUMP
DESCRIP
1 5° P V C LATERAL
DESCRIP
0 TO 5 YEARS DOUBLE LOW PRESSURE PUMP
OTT PRICE PER UNIT TOTAL
4 $ 200 000 00 $ 800 000 00
TOTAL S 80000000
sq ft sq yd PRICE PER UNIT TOTAL
326900 'x'122 22 $ 758 $ 275 32244
TOTAL 3 27532244
OTT
35300 LF $
OTT
706
SUB -TOTAL $ 2594 197 44
10 % contingency $259 419 74
TOTAL (FUNDABLE BY SRF) $ 2,853,61719
PRICE PER UNIT UNIT/INSTALL
3.00 $ 750 $ 264 750 00
PRICE PER UNIT UNIT/INSTALL
$ 800 00 $ 1 600 00
VILLAGE OF KEY BISCAYNE
$112960000
MSC FEES
SEWER CONNECTION PERMIT FEE 706 $ 5000 $ 3530000
CONNECTION FEE FOR MDWASD 706 $ 200000 $1 412 000 00
ANNUAL OPER & MAINT FEE(WASA) 706 $ 60000 $ 423 600 00
ANNUALOPER &MAINT FEE(STEP) 706 $ 17500 $ 123 550 00
PUMP OUT & ABANDONMENT 706 $ 30000 $ 211 800 00
SUB -TOTAL COST FOR RESIDENTS $ 3 600 600 00
COST PER CUSTOMER S 5 100 00
NOTE Costs to owners does of include abo donment of tank nor replacement of tank ( due to deter orated oondrt on or
inadequacy fo fu cboning & pl cement of pumps) if applicable
VILLAGE OF KEY BISCAYNE
Lw
91,40
F
Mt.
Sanitary Sewer Cost Estimate
Zone 1 8725 —LF 30 MANHOLES
Zone 2 11115 LF 30 MANHOLES
Zone 3 16902 LF 47 MANHOLES
Zone 4 7285 LF 25 MANHOLES
Late al 6 DIP at an a erage of 25 otp pe per unit
RU -1 608 UNITS
RU -4L 56 UNITS
RU -2 26 UNITS
BU -1 16 UNITS
Late als 6 DIP 706 Total Units
In summary
45000 LF OF 8 DIP (GRAVITY SEWER)
52950 LF OF 6 DIP (LATERAL)
OF WHICH 17 650 LF ARE FUNDABLE BY S R F
132 MANHOLES
2000 LF & DIP (FORCEMAIM
1000 LF 8 DIP (FORCEMAIN)
1000 LF 12 DIP (FORCEMAIN)
3000 LF 24 DIP (FORCEMAIM
BREAKDOWN
MANHOLES
PIPE
DEPTH QTY PRICE PER UNIT UNIT/INSTALL TOTAL
6 OR LESS 20 $ 92500 $ 2300 00 $ 46000 00
6 8 40 $ 1,27500 $ 3 200 00 S 128 000 00
8 OR GREATER 72 $ 1 650 00 $ 4100.00 8 295,20000
TOTAL $ 46920000
DESCRIP OTT PRICE PER UNIT UNIT/INSTALL TOTAL
6° DIP 19650 $ 1969 $ 4430 $ 870 49500
8 DIP 46000 $ 2275 $ 6000 5276000000
12 DIP 1000 $ 3693 $ 8500 $ 86 000 00
24 DIP 3000 $ 54 59 $ 130 00 S 390 000 00
TOTAL $4 105 495 00
PUMP STATIONS
DESCRIP
SUBMIRSIBLE PUMP
PAVEMENT REST
OTT PRICE PER UNIT TOTAL
4 $ 200 000 00 S 800 000 00
TOTAL $ 80000000
DESCRIP sq ft sq yd PRICE PER UNIT TOTAL
ASPHALTIC CONCRETE 326900 A6.S9222 $ 758 $ 275 322.44
OVERALL TOTAL
10 % CONTINGENCY
TOTAL $ 275 322.44
55650 017 44
$565,001 74
TOTAL (FUNDABLE BY SRF) $ 6,215 01919
7
COST FOR RESIDENTS
PIPE
DESCRIP OTY PRICE PER UNIT UNIT/INSTALL
6' DIP LATERAL 35300 LF $ 1969 $ 3000 $1 059 000 00
MSC FEES
SEWER CONNECTION PERMIT FEE 706 $ 5000 $ 3530000
CONNECTION FEE FOR MDWASD 706 $ 2 000 00 $1 412 00000
ABANDOMENT FEE 706 $ 450 00 $ 317 700 00
ANNUAL OPER & MAIM FEE 706 $ 600 00 $ 423 600 00
SUB -TOTAL COST FOR RESIDENTS $324760000
GRAND TOTAL $946261919
System Cost Comparison
Total Number of Customers to be Served = 706
Planning Period Considered for Analysis = 20 years
Interest Rate Used for Analysis = 7 375%
1
t
STEP SYSTEM
Present Worth For System (for monies fundable by SRF monies)
PW
Present Worth For System (for 20 year design period)
ITEMS TO CONSIDER
_ $ 2 853 617 19
Present Costs
Costs from above for system = $ 2 853 617 19
Costs for laterals = $ 264 750
Costs for initial dual pump system sewer connection permit fee
connection fee for MDWASD and pump out & abandonment = $ 2 788 700
TOTAL = $ 5, 907, 06719
Annual Costs
Annual Operation & Maintenance for System(WASA) = $ 423, 600 / year
Annual Operation & Maintenance for System(STEP) _ $ 123, 550 / year
Future Costs
Double Step Pump (706 umts) at year 5 = $ 1, 412, 000
Double Step Pump (706 units) at year 10 = $ 1, 694, 400
Double Step Pump (706 units) at year 15 = $ 2,118, 000
Salvage Value (straight line depreciation) was calculated for all components of the project
which have a useful life greater than the analysis penod ( life span > 20 years )
Costs
Pipe ( 50 year useful life) = $1 783 625
POT
Therefore S V =1,783,625 20 [ (1,783,625 0) / 50 ] = $ 1, 070,175
Taking into account present costs annuanl costs and the future costs we get the following
equation for our present worth analysis
P W = PRESENT COSTS + ANNUAL COSTS + FUTURE COSTS
PW = $5 907 067 19 $547150[((l+i) MOO +i) )]+ $1412000(1+i)5 +
$1694400(1+i)i0 + $2118000(1+1)t5+$1070175(1+i)20
P W $5 907 067 19 $5 631 339 85 $989 279 05 $831 733 46 $728 414 03 +
$257 864 33
= $ 13, 829, 969.25
piss
GRAVITY / FORCEMAIN ALTERNATIVE
Present Worth For System (fundable by SRF monies)
PW
Present Worth For System ( over 20 year design period
ITEMS TO CONSIDER
Present Costs
=$6 215000
Costs from above for system = $ 6 215 000
Costs for laterals = $ 1 059 000
Costs for sewer connection pernut fee connection fee for MDWASD
and septic tank pump out and abandonment fee = $ 1 765 000
TOTAL = $ 9, 039, 000
Annual Costs
Annual Operation and Maintenance Fee = $ 423, 600 / year
Future Costs
The salvage value for this alternative is as follows
Cost
Pipe = $ 5 164 495
Manholes = $ 469 200
Total Cost = $ 5 633 695
Therfore S V =$5,633, 695 20 [ ( $5, 633, 695 0) / 50 ] = $ 3, 380, 217
P W = PRESENT COSTS + ANNUAL COSTS + FUTURE COSTS
PW = $9 039 000 $423600[((1+i) 1)/(i(1+i) )]+ $3 380 217(1+1)20
P W = $9 039 000 $4 359 746 92 + $814 481 16 = $12, 584, 265 76
The present worth analysis provides insight into the present costs associated with each
system and how the 20 year costs compare between alternatives The costs of the STEP system
is less than that of the gravity / forcemain alternative when considenng the costs fundable by
SRF monies The costs for the step system is approximately $ 2 853 620 while the gravity /
forcemain will cost approximately $ 6 215 000 However when considenng all of the
associated costs of each system over the 20 year design penod, the STEP system turns out to be
more expensive than the gravity / forcemain alternative The step system will now cost
approximately $ 13 829 970 and the gravity / forcemain $ 12 584 270 As a result the gravity
/ forcemain is the best alternative considenng the 20 year design period
pma