Agenda 06/23/2009 Item #16B 5
Agenda Item No. 16B5
June 23, 2009
Page 1 of 22
EXECUTIVE SUMMARY
Recommendation that the Board of County Commissioners direct the County
Manager, or his designee, and the County Attorney to prepare the necessary
amendments to Chapter 74 of the Collier County Code of Laws and Ordinances,
which is the Collier County Consolidated Impact Fee Ordinance, to provide for the
incorporation of a new Road Impact Fee land use category and impact fee rate for
mines, consistent with previous direction, for future consideration by the Board of
County Commissioners at an advertised public hearing.
OBJECTIVE: That the Board of County Commissioners (Board) direct the County
Manager, or his designee, and the County Attorney to prepare the necessary amendments
to Chapter 74 of the Collier County Code of Laws and Ordinances (Code), which is the
Collier County Consolidated Impact Fee Ordinance, to provide for the incorporation of a
new Road Impact Fee land use category and impact fee rate for mines, consistent with
previous direction, for future consideration by the Board of County Commissioners at an
advertised public hearing.
CONSIDERA TIONS: Mining activities in Collier County are currently permitted
through Conditional Use applications and excavation permits through CDES. The impacts
to the county transportation grid are significant in two critical areas. Heavy haul vehicles
place an inordinate burden on the physical characteristics of the adjacent roadway network
and throughout the area by stressing the structural integrity of the roadway shoulders on
rural roads. They further impact the roads by pushing the top layer of asphalt (friction
course) and wash boarding the structural course as they stop at intersections and along the
roadways. Heavy haul vehicles also consume roadway capacity at almost twice the rate as
passenger cars. It can be particularly detrimental at intersections where the heavy haul
vehicles require significantly more time to accelerate and maneuver than is required by a
passenger vehicle.
The County currently addresses the physical impacts to the road by allowing the mining
site the option of maintaining the structural integrity of the roadway around their area of
significant influence or by contributing $1.00 (one dollar), to road maintenances, for every
loaded vehicle exiting the site. The County does not currently have an impact fee in place
that addresses the replacement of roadway capacity. Staff has retained Tindale-Oliver
Assoc. to complete a full study of mining operations including trip generation rate,
average trip length, and percent new trips. Trip generation is calculated using the
permitted cubic yards of material over the life of a mine, and the average trip length and
percent new trips were obtained through origin-destination surveys at the local active
mining sites. Attached is the full report that documents the impact fee which would be
associated with mining activities. It should be noted that most mining facilities, once
exhausted, convert to a secondary use such as residential lake front housing. Heritage Bay
provides a good example. Impact fees paid for by the mining site would be tracked as a
credit that runs with the land that could be used if and when the site converts to another
land use.
Agenda Item No. 16B5
June 23, 2009
Page 2 of 22
The following chart provides the impact fee generated for three sites based on the cubic
yards permitted to be excavated from the sample site and provides the single family home
equivalent. This chart also appears as Table 3 in the attached report.
15.000
$134.000
$1.008.600
$450.000
Fainil~;H6fu
$10.372
$10.372
$10.372
43
2.576
12.285
33.620
(1) Source: Collier County Transportation Planning Department
(2) Permitted tonnage for each site multiplied by the net impact fee rate of 3 cents per cubic yard
(3) Source: Collier County Impact Fee Schedule
(4) Calculated total transportation impact fee (Item 2) divided by the transportation impact fee for
single family homes (Item 3)
If adopted by the Board via an advertised public hearing at a future regular meeting of the
Board of County Commissioners, this new impact fee category and corresponding rate of
$30 per 1,000 cubic yards will be subject to the 90-day notice period required by Section
163.31801 (3)( d), Florida Statutes.
Lee County has added mines as a separate land use to their transportation impact fee
schedule in September of 2008. Their adopted fee is $40 per 1,000 cubic yards. Below is
a comparison of trip characteristic variables used in the Lee and Collier County studies:
. Lee County study used a trip generation rate of 0.023 trips per 1,000 cubic yards.
The study for Collier County used a lower trip generation rate of 0.015 trips per
1,000 cubic yards.
. Lee County calculations are based on a trip length of 10.41 miles, and it appears
that the trip length for residential land uses is used as proxy in obtaining this
length. Calculations prepared for Collier County uses a trip length of 14.82 miles
based on actual trip characteristic studies conducted at existing mines.
. Percent of new trips used in the Lee County study is 95%, while this figure is 97%
in Collier County. The figure used for Collier County is again based on actual trip
characteristic studies.
The item was presented to the Development Services Advisory Committee (DSAC) and
the Productivity Committee. DSAC was split 5 to 5 on the new rate category and the
Productivity Committee voted 7 to 2 in support of the new rate category.
FISCAL IMPACT: The inclusion of this new category on the Road Impact Fee rate
schedule will provide a uniform fee of $30 per 1,000 cubic yards of permitted excavation.
Agenda Item No. 16B5
June 23, 2009
Page 3 of 22
GROWTH MANAGEMENT IMPACT: This change is consistent with Objective 1.2
of the Capital Improvement Element (CIE) of the Collier County Growth Management
Plan (GMP), which states: "Future development will bear a proportionate cost ojfacility
improvements necessitated by gr01vth."
LEGAL CONSIDERATIONS: The County Attorney will work with staff to implement
Board direction. If Board direction is to move forward with the proposed ordinance, the
County Attorney will work with the County's outside impact fee counsel in an attempt to
craft a legally defensible ordinance and if so to ensure that the underlying impact fee study
is legally sufficient. This is a policy decision requiring simple majority vote. -JAK
RECOMMENDATION: That the Board of County Commissioners direct the County
Manager, or his designee, and the County Attorney to prepare the necessary amendments
to Chapter 74 of the Collier County Code of Laws and Ordinances, which is the Collier
County Consolidated Impact Fee Ordinance, to provide for the incorporation of a new
Road Impact Fee land use category and impact fee rate for mines, consistent with previous
direction, for future consideration by the Board of County Commissioners as an
advertised public hearing.
Prepared by: Nick Casalanguida, Transportation Planning Director, Transportation
Services; in coordination with Amy Patterson, Impact Fee and Economic Development
Manager, Community Development and Environmental Services
Attachment: Mining Study-Final Report
Item Number:
Item Summary:
Meeting Date:
Page I of2
Agenda Item No. 16B5
June 23, 2009
Page 4 of 22
COLLIER COUNTY
BOARD OF COUNTY COMMISSIONERS
1685
Recommendation that the Board of County Commissioners directs the County Manager, or
his designee, and the County Attorney to prepare the necessary amendments to Chapter 74
of the Collier County Code of Laws and Ordinances, which is the Collier County Consolidated
Impact Fee Ordinance, to provide for the incorporation of a new Road Impact Fee land use
category and impact fee rate for mines, consistent with previous direction, for future
consideration by the Board of County Commissioners at an advertised public hearing.
6/23/200990000 AM
Prepared By
Nick Casalanguida
Transportation Services
MPO Director
Date
Transportation Planning
6/5/20092:05:40 PM
Approved By
Nick Casalanguida
Transportation Services
MPO Director
Date
Transportation Planning
6/5/20092:04 PM
Approved By
Gloria Herrera
Transportation Services
Date
Management/Budget Analyst
Stormwater Management
6/8/2009 2:12 PM
Approved By
Amy Patterson
Community Development &
Environmental Services
Impact Fee Manager
Date
Financial Admin. & Housing
6/9/20092:09 PM
Approved By
Date
Jeff Klatzkow
County Attorney
County Attorney
County Attorney Office
6/10/20099:38 AM
Approved By
Norm E. Feder, AICP
Transportation Services
Transportation Division Administrator
Transportation Services Admin.
Date
6/10/200910:09 AM
Approved By
Therese Stanley
Transportation
Grants Coordinator
Date
Transportation Administration
6/11/2009 12:55 PM
Approved By
Pat Lehnhard
Transportation Services
Executive Secretary
Transportation Services Admin
Date
6/11/2009 1 :36 PM
Approved By
OMB Coordinator
County Manager's Office
OMB Coordinator
Office of Management & Budget
Date
6/11/2009 4:05 PM
Approved By
Susan Usher
Date
County Manager's Office
Senior Management/Budget Analyst
Office of Management & Budget
6/15/2009 1 :19 PM
file://C:\AgendaTest\Export\ 132-June%2023, %202009\ 16. %20CONSENT%20AGENDA \ 1... 6/17/2009
Page 20f2
Agenda Item No. 16B5
June 23, 2009
Page 5 of 22
Approved By
Leo E. Ochs, Jr.
Board of County
Commissioners
Deputy County Manager
Date
County Manager's Office
6/15/2009 3:40 PM
file://C:\AgendaTest\Export\ 132-June%2023,%202009\16.%20CONSENT%20AGENDA\ 1... 6/17/2009
COLLIER COUNTY
TRIP CHARACTERISTICS STUDY
MINE LAND USE
FINAL REPORT
Co~T County
~.~ -
May 22, 2009
Preparedfor:
COLLIER COUNTY
330] E. Tamiami Trail
Naples, Florida 34112
Ph (239) 252-8999
Prepared by:
Tindale-Oliver & Associates, Inc.
lOOO N Ashley Dr., #]00
Tampa, Florida, 33602
ph (813) 224-8862,fax (813) 226-2]06
073048-02.09
Agenda Item No. 16B5
June 23, 2009
Page 6 of 22
Agenda Item No. 16B5
June 23, 2009
Page 7 of 22
COLLIER COUNTY
TRIP CHARACTERISTICS STUDY - MINE LAND USE
Table of Contents
1.0
INTR 0 D U CTI ON ........................ ...... ....... ............... ....... ...............: ..........
1
2.0
SITE S EL ECTI ON ......... ....... ....... ............................ ......... ........................
1
3.0
SAMPLE SIZE REQUIREMENT ANALYSIS ......................................
2
4.0
TRIP CHARACTERISTICS RESULTS ..................................................
2
4.1 Trip Generation Rate ............................................................................. 2
4.2 Percent New Trips ................................................................................. 2
4.3 Trip Length ............................................................................................ 3
4.4 Impact Fee Calculation .......................................................................... 4
APPENDIX A - Collier County Mine Trip Characteristics Study Data
APPENDIX B - Collier County Trip Generation Rate. Interstate Adjustment
Factor, and Fuel Efficiency Calculations for Mines
Tindale-Oliver & Associates, Inc.
May 2009
Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23,2009
Page 8 of 22
1.0 INTRODUCTION
Collier County retained Tindale-Oliver & Associates, Inc. to conduct a trip characteristics
study for mine land use that measures the trip length and percent new trips. This summary
report presents the results of the trip data collected for the mine land use in Collier County,
which will be used to develop travel demand for the mine land use based on typical mine
developments in Collier County. Included in this document is a summary of the trip
characteristics study results, as well as the necessary support material utilized in the
development of the summary statistics.
Trip characteristics are inputs to the demand component of the Collier County
transportation impact fee equation that measures the demand for travel placed on the
transportation system per unit of development. This travel demand is usually expressed in
units of vehicle miles or lane miles of roadway capacity consumed. In particular, the three .
variables needed to obtain the measure of vehicle miles traveled (VMT) in Collier County
for any given land uses are:
.
Number of daily trips generated, or the trip rate (this variable was previously
calculated by TOA, and as such, is not part of this study. Appendix B includes an
explanation of how the trip generation rate was determined);
Length of those trips; and
Proportion of travel that is new travel, rather than travel that is estimated to have
already been on the road system, referred to as percent new trips.
.
.
2.0
SITE SELECTION
Study sites were selected based on an evaluation of mine capacity and location within the
County as well as discussions with County staff.
2.1 Mines Land Use
Surveys were conducted at the following three sites:
. Site 1, Golden Gate Mine, which is located in the east central portion of the County;
. Site 2, Jones Mine, which is located in the northern half of the County;
. Site 3, Sunniland Mine, which is located in the northeast quadrant of the County.
Tindale-OJiver & Associates, Inc.
May 2009
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Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23,2009
Page 9 of 22
3.0 SAMPLE SIZE REQUIREMENT ANALYSIS
Due to the small number of survey samples obtained, the typical confidence test to
determine the required sample size did not apply to this data collection effort. The entire
population of potential inbound and outbound trips were surveyed and provided a
representative sample of mine trucking travel in Collier County. Discussions with site
management at all three sites confirmed that the job tickets issued at the time of the
origin-destination survey data collection were typical of average trip lengths in Collier
County.
TRIP CHARACTERISTICS RESULTS
Results of the trip characteristics surveys are summarized in Tables 1 and 2. These tables
provide information regarding the percent new trips and average trip length for each of
the mines previously referenced. As mentioned previously, the trip generation rate was
estimated through a separate analysis. Data resulting from the trip characteristics surveys
are included in Appendix A of this report and, are used in the development of the demand
component of the transportation impact fee calculation for the mine land use.
4.1 Trip Generation Rate
The trip generation rate for the mine land use was prepared by TOA previously, and is
summarized in Appendix B. Based on these findings, the resulting weighted average trip
generation rate for the mine land use is 0.015 trips per 1,000 cubic yards. This figure is
based on the estimate of 16 cubic yards per truck.
4.2 Percent New Trips
The percentage of new trips computed from the survey data collected. The weighted
average percent new trips is obtained by weighting the percent new trips of each site by
the number of surveys used. For each site, the percent new trips is calculated by first
classifying all trips as either a captured trip, primary trip, diverted trip, or secondary trip.
The percentage of the combined primary, diverted, and secondary trips of the total trips
classified is the percent new trips. This methodology for classifying trips was published
by Bill Oliver (TOA Senior Vice President) in the ITE article Measuring Travel
Characteristics for Transportation Impact Fees, in April, 1991.
Tindale-Oliver & Associates, Inc.
May 2009
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Collier County
Mines Trip Characteristics Study
Agenda Item No. 1685
June 23, 2009
Page 10 of 22
The results indicated that the percent new trips to the mine land use ranged from 90
percent to 100 percent. As shown in Table 1, the resulting weighted average percent new
trips is 97 percent for the mine land use.
Table 1
Percent New Trips Summary(!)
Site 1 108 106
Site 2 36 32
Site 3 44 44
Total: 188 182
Weighted Average % New Tri s: 97%
(1) Source: Origin-Destination surveys conducted in
Collier County, January 2009
4.3 Trip Length
The second variable obtained from the trip characteristics study is trip length. To
calculate the weighted average trip length from the data collected in Collier County the
average trip length for each site is weighted by the number of assessable trip ends
obtained from the surveys collected at the study site.
Table 2 presents the weighted average trip length obtained from the collected survey data.
As shown, mine land use trip lengths range from 8.07 miles to 17.33 miles. As shown in
Table 2, the resulting weighted average trip length for the mine land use is 14.82 miles.
The results of the data reduction process are presented in detail in Appendix A, including
survey number, trip type, inbound and outbound trip lengths, and assessable trip length that
assesses all data plus or minus three standard deviations of the mean and excluding
resulting data that lie outside this range. Note that trip type is denoted as "C" for captured,
"P" for primary, "D" for diverted, and "S" for secondary. Also, the limit check denotes
"OK" if the inbound and outbound trip lengths lie within three standard deviations of the
mean and are, thus, assessable lengths, or "NO" if the trip lengths are considered outliers
and are excluded from the assessable trip length calculation.
As shown in Appendix A, Tables A-I through A-3 present the results of the survey at the
three selected sites.
Tindale-Oliver & Associates, Inc.
May 2009
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Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23, 2009
Page 11 of 22
Table 2
Trip Length Summary (I)
Site Assessable Average Weighted
Reference Trip Ends ... Assessable Trip
Trip Len2f:h Lemrths
Site 1 108 17.33 1,871.64
Site 2 36 8.07 290.52
Site 3 44 14.20 624.80
Total: 188 2,786.96
Weighted Average Trip Length: 14.82
(1) Source: Origin-Destination surveys conducted in Collier
County, January 2009
4.4 Impact Fee Calculation
This section provides the calculation of the net impact fee for the mine land use using
information from the adopted impact fee methodology summarized in the Collier County
Tramportation Impact Fee Final Report. Febru(lIY 2009 and the results of the study
presented previously. The following equations are utilized to calculate the net impact fee:
Net Impact Fee = Total Impact Cost - Total Credit
Where:
Total Impact Cost = ((Trip lIate x Assessable Trip Length x 0;, New TnjJs) /2) x (i-lllterstate/Toll Facility
Ad). Factor) x (Cost per Lalle Mile / Al'g Capacity Added per Lane Mile)
Gas Tax Credit = PresCllt Vallie (Allllllal Gas Tax), gil'ell 4.5~iJ illterest rate & 25-yearfacility life
Annual Ga.\' Tax = (((Trip Rale x Total Trip Length x "0 NOI Trips) ,.2) x Effective Days per Year x
$/Gal/oll to Capital) / File! E((iciellcv
Ad Valorem Tax Credit = CalclIlated based Oil average taxahle value of each L1llit alld portioll of ad valorem
tax revellLles L1sed fiw trallsportatioll capaCi(I' projects
Each of the inputs has been discussed previously in this document and in the referenced
Collier County transportation impact fee study; however, for purposes of this example
and because adjustments were made to some of the variable to account for the fact that
mines primarily attract trucks, brief definitions for each input are provided in the
Tindale-Oliver & Associates. Inc.
May 2009
4
Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23, 2009
Page 12 of 22
following paragraphs, along with the actual inputs used in the calculation of the mine
land use category:
. Trip Rate = the average daily trip generation rate, in vehicle-tripslday on a per 1,000 cubic yards
basis (0.015)
. Assessable Trip Length = the actual average trip length for the category, in vehicle-miles (14.82)
. Total Trip Length = the recommended trip length plus an adjustment factor of half a mile, which is
added to the trip length to account for the fact that gas taxes are collected for travel on all roads
including local roads (14.82 + 0.50 = 15.32)
. % New Trips = adjustment factor to account for trips that are already on the roadway (97%)
. Divide by 2 = the total daily miles of travel generated by a particular category (i.e., rate*length*%
new trips) is divided by two to prevent the double-counting of travel generated among land use codes
since every trip has an origin and a destination.
. Interstate/Toll Facility Adjustment Factor = adjustment factor to account for the travel demand
occurring on interstate highways andlor toll facilities (27.3%). It should be noted that this factor has
been calculated for the truck traffic separately, and results in a more conservative impact fee. Please
see Appendix B for further explanation.
. Cost per Lane Mile = unit cost to construct one lane mile of roadway, in $l1anc-mile ($6,255,570)
. Average Capacity Added per Lane Mile = represents the avcrage daily traffic on onc travcl lanc at
maximum Icvcl of service volumc fi:)r one lane milc of roadway, in vehicles/lanc-mile/day (10,217)
. Present Value = calculation ofthc present valuc of a unifonn series of cash flows, gas tax payments
in this case, given an intcrest rate, "i," and a number of periods, "n;" for 4.5% interest and a 25-year
facility life, the unifonn scries prcscnt worth factor is 14.8282
. Effective Days per Year = 365 days
. $/Gallon to Capital = the amount of gas tax revcnue per gallon of fuel that is used for capital
improvements, in $Igallon ($0.258). This factor takes into consideration that thc 2nd Local Option
Gas Tax is not imposed on diesel fuel.
. Fuel Efficiency = average fuel efficiency of vehicles, in vehicle-mileslgallon (5.9). This factor is
recalculated to represent trucks' fuel efficiency. Please see Appendix B for further explanation.
Using these inputs, a net impact fee can be calculated for the mine land use category as
follows.
Total Impact Cost = ((0.000015 * 14.82 * 0.97) /2) * (I - 0.273) * ($6,255,570/10,217) =
$0.04799
Annual Gas Tax = (((0.000010 * 15.32 * 0.97) /2) * 365 * $0.258) /5.9 = $0.01186
Gas Tax Credit = $0.001186 * 14.8282 = $0.017585
Ad Valorem Tax Credit = $0.00016
Net Impact Fee (per cubic yard) = $0.04799 - $0.017585 - $0.00016 = $0.03
Table 3 presents sample impact fee calculations for three of the sites that were used to
collect origin-destination survey data based on the approved tonnage (in increments of
per 1,000 cubic yards) in the mining permits for each respective site. The table also
provides the equivalency of the impact fee amount in terms of the number of single
Tinda!e-Oliver & Associates, Inc.
May 2009
5
Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23, 2009
Page 13 of 22
family homes. As with any other land use, the impact fee for mines runs with the land,
and therefore, the fee for mines could be viewed as a pre-payment since previously paid
impact fees would be credited against the impact fee that will be owed by future
developments on the same site. As presented, the fee calculated for the 833-acre site
(Site 1 in Table 3) would be equivalent of paying an impact fee for 23 homes that could
be developed on the same site. Similarly, the fees calculated for the other two mines
would equal to paying impact fees for 43 and 97 homes. Given the large acreage of
mines, it is highly likely that the total number of homes built on these sites will easily
exceed the equivalent number of homes shown in Table 3.
Table 3
Sample Impact Fee Calculations
Site 1
Site 2
Site 3
833
2,576
12,285
7,800
33,620
1 5,000
$234,000
$1,008,600
$450,000
. r~a~sJ>~rt~ti?P
Impact Feefor a
""':'_~ "'<,/-". ,"':1\4,l"',:J,':.'<.,:,;","':'_'
~d-S~~ingle
.........c.,' .......i...'i0/.... (3)
Fillnil Home;
$10,372
$10,372
$10,372
..,..'...,..........,-,.,...,
<.;~.:,.:~.::>.', ':-'--';n.~.:-...;.,..:::,',.-:'
"'. "(1)
Tonnage:,
(~,OOO c:,~
,."..._.:..:.........;..,'.,-:-...... ,'-'--".....
'CaIculatedTotal
;.:, 0-: ,,-c-.:t<\: ',: <;.-~'-?'.;", ;::r: ;,':iQ~:;;;;,
.... Ttansportll,tioii
...;.. :',,~.. ",' ..:" (2)'-::
n Impact Fee..., , ....
(1) Source: Collier County Transportation Planning Department
(2) Permitted tonnage for each site multiplied by the net impact fee rate of 3 cents per
cubic yard
(3) Source: Collier County Impact Fee Schedule
(4) Calculated total transportation impact fee (Item 2) divided by the transportation
impact fee for single family homes (Item 3)
Tindale-Oliver & Associates, Inc.
May 2009
6
Collier County
Mines Trip Characteristics Study
APPENDIX A
Collier County Mine Trip Characteristics Study Data
Agenda Item No. 16B5
June 23, 2009
Page 14 of 22
DRAFT
Agenda Item No. 16B5
June 23, 2009
Page 15 of 22
Table A-1
Trip Length and Percent New Trips Statistical Analysis
Mines Land Use Site 1
Inbound Outbouna
Trip Type Assessable Trip Assessable Trip
Survey # (P,C,D,S) Length Length
1-1 D 40 40
1-2 D 14.5 14.5
1-3 S 2.7 6
1-4 D 40 40
1-5 S 5.9 2.2
1-7 D 21.8 21.8
1-8 D 30 30
1-9 D 74 74
1-10 D 30 30
1-11 P 12.8 12.8
1-12 D 15 15
1-13 P 12.8 12.8
1-15 D 7.5 7.5
1-16 D 15 15
1-17 D 30 30
1-18 C - -
1-19 D 7.3 7.3
1-20 D 7.3 7.3
1-21 P 40 40
1-22 P 12.8 12.8
1-24 P 12.8 12.8
1-25 P 12.8 12.8
1-26 P 12.8 12.8
1-27 P 12.8 12.8
1-28 P 12.8 12.8
1-29 P 32.5 32.5
1-31 S 40 34.9
1-32 P 5.5 5.5
1-33 D 74 74
1-34 P 12.8 12.8
1-35 D 7.3 7.3
1-36 D 74 74
1-37 D 7.3 7.3
1-38 P 12.8 12.8
1-40 D 7.3 7.3
1-41 P 12.8 12.8
1-42 P 12.8 12.8
1-43 P 12.8 12.8
1-44 P 12.8 12.8
1-45 P 128 12.8
1-46 S 12.9 13
Tindale-Oliver & Associates, Inc.
May 2009
A-I
Collier County
Mines Trip Characteristics Study
DRAFT
Agenda Item No. 16B5
June 23,2009
Page 16 of 22
Table A-1 (continued)
Trip length and Percent New Trips Statistical Analysis
Mines land Use - Site 1
1-48 P 8.2 8.2
1-50 p 17.9 17.9
1-51 P 40 40
1-52 P 26.9 26.9
1-53 S 12.9 6.7
1-54 P 27.9 27.9
1-55 S 7 8
1-56 D 7.3 7.3
1-57 P 12.8 12.8
1-60 S 15.9 16.8
1-61 P 11.8 11.8
1-62 P 39 39
1-63 P 40 40
1-64 P 39 39
Trip Length Summary:
"i""";'';'" ..AssessableTrip .;; .."....~
Average 17.33
Standard Deviation 11 .43
Averaqe + 30- 51.61
Averaae - 30- 0.00
Coefficient of Variation 0.659
Count of Assessable Trip Ends 108
Tindale-Oliver & Associates, Inc.
May 2009
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Collier County
Mines Trip Characteristics Study
DRAFT
Agenda Item No, 16B5
June 23, 2009
Page 17 of 22
Table A-2
Trip length and Percent New Trips Statistical Analysis
Mines land Use - Site 2
Inbound. .....O,utbound ,
'.,.... Trip Type ~sessable Trip Assessable Trip
SurVey # (P,C,D,S) Lengttf Length
2-1 S 7.9 12.8
2-4 C - -
2-7 S 14.4 8.6
2-8 p 8.7 8.7
2-9 S 12.8 19
2-10 S 8.5 8.8
2-12 p 7 7
2-13 P 16.9 16.9
2-14 D 1.9 1.9
2-15 D 0.8 0.8
2-16 p 19 19
2-17 D 0.2 0.2
2-18 S 8.5 8.8
2-21 D 3 3
2-22 C - -
2-23 S 16.8 19
2-24 D 3.2 3.2
2-25 D 1.9 1.9
2-26 D 0.2 0.2
2-27 D 9.5 9.5
Trip Length Summary:
Assessable Trip Length
Average 8.07
Standard Deviation 6.34
Averaqe + 3cr 27.10
Averaqe - 3cr 0.00
Coefficient of Variation 0.786
Count of Assessable Trip Ends 36
Trip Type Summary:
Trip Type Count % of Total
Primary Trips 4 20%
Diverted Trips 8 40%
Secondary Trips 6 30%
Captured Trips 2 10%
Total Survevs: 20 -
% New Trips of Total Surveys: 90%
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Collier County
Mines Trip Characteristics Study
DRAFT
Agenda Item No. 16B5
June 23, 2009
Page 18 of 22
Table A-3
Trip Length and Percent New Trips Statistical Analysis
Mines Land Use - Site 3
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
3-18
3-19
3-20
3-21
3-22
2.3
2.3
14
14
14
14
11.9
11.9
14
14
14
14.1
11.9
11.9
14
14
37.4
37.4
11.9
11.9
11.9
11.9
2.3
2.3
11.8
11.8
14
14
11.9
11.9
14
14
14
14.1
11.9
11.9
14
14
37.4
37.4
11.9
11.9
11.9
11.9
Trip Length Summary:
'>,.,." Assessable Trip Length ..'.."'-'
Average 14.20
Standard Deviation 8.09
AveraQe + 3cr 38.48
Averaqe - 3cr 0.00
Coefficient of Variation 0.570
Count of Assessable Trip Ends 44
Tindale-Oliver & Associates, Inc.
May 2009
A-4
Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23, 2009
Page 19 of 22
APPENDIX B
Collier County Trip Generation Rate, Interstate Adjustment Factor, and
Fuel Efficiency Calculations for Mines
Agenda Item No. 16B5
June 23, 2009
Page 20 of 22
Trip Generation Determination
There are several variables to consider related to mining truck trips, such as:
. Size of mine, in acres
. Depth of excavation, in feet
. Volume of mine, in cubic yards (CY)
. Anticipated duration of mine, in years
. Truck hauling capacity per load
. Days of hauling per week
. Truck to passenger car equivalency factor
TOA reviewed the following material for the trip generation calculations:
. Lee County Truck Impact Evaluation Report (David Douglas and Associates,
July 2008), which was used as the basis for the calculation of the mine land
use transportation impact fee in Lee County;
. Four mining traffic impact statements including:
o Gardiner Earth Mine - Hendry County;
o Hogan Island Mine - Collier County;
o SR 846 Land Trust Mine - Collier County; and
o Good Grove Mine - Manatee County.
. Permitting information for the existing mines in Collier County; and
. Annual reports from the three existing mines in Collier County.
In addition, TOA interviewed the operators of the three mines where trip characteristics
surveys were conducted to obtain additional information.
Based on this review, it became apparent that trip activity to and from mines is very
volatile and depends heavily on demand for material extracted. In addition, the
amount of material leaving a mine is limited by the loading rates and truck weighing
rates across the scales, measured in trucks per minute. Information provided by the
representatives of the three mines where the trip characteristics studies were
conducted indicated that these mines have the capability to load 18,40 and 50 trucks
per hour, which results in an average loading capacity of 36 trucks per hour, or 1.7
minutes per truck, with a range of 1.2 minutes to 3.3 minutes per truck.
The study made the following assumptions for a typical mine:
Tindale-Oliver & Associates, Inc.
May 2009
B-1
Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23, 2009
Page 21 of 22
o 40-year life span;
o 8-hour work days; and
o 6-day work weeks.
These assumptions resulted in an average loading time of 3 minutes per truck for the
largest of the three mines surveyed (with a capacity of approximately 33.6 million
cubic yards of material). For the smaller mines, the same assumptions resulted in an
average loading time of 6.5 minutes (for the mine with a capacity of 15 million cubic
yards), and 12 minutes (mine with a capacity of 7.8 million cubic yards). As
presented, these loading times are well within the capabilities of each mine, and the
assumptions result in more conservative results as the mine capacity decreases.
Many of the traffic impact statements distributed an anticipated mining volume over
an estimated duration of mining activities. This method is reasonable for determining
level of service impacts for local network improvements. As explained above, for
this impact fee analysis the time period or "life of the mine" is assumed to be 40 years
to develop the needed trip generation rate that goes into the impact fee calculation.
The total 40 year annualized trip rate is 0.015 trips per 1,000 cubic yards (including
an equivalent truck to car factor of 1.5) for trucks. In addition, the trip generation
from light vehicles (employees, etc.) was found to be negligible. Because of this and
to provide a conservative approach, these trips were not added to truck trips.
The trip generation rate used for gas tax credit calculation does not use the conversion
to cars factor since the fuel efficiency factor for gas tax calculations is already
adjusted for trucks. As such, the necessary figure for this calculation is the number of
trucks, and not the equivalent number of cars.
Tindale-Oliver & Associates, Inc.
May 2009
B-2
Collier County
Mines Trip Characteristics Study
Agenda Item No. 16B5
June 23, 2009
Page 22 of 22
Interstateffoll Facility Adjustment Factor
This variable is used to recognize that Interstate highway and toll facility improvements
are funded by the State using earmarked State and Federal funds. Typically, impact fees
are not used to pay for these improvements and the portion oftravel occuning on the
interstate/toll facility system is usually eliminated from the total travel for each use.
Currently, 1-75 is the only interstate running through the County. This factor is used to
reduce vehicle miles of travel that the impact fee charges for each land use.
The transportation impact fee study calculates this factor at 8.4 percent, based on the data
from the 2030 Lee/Collier Transportation Planning model on the vehicle miles of travel
(VMT) on 1-75 relative to the total VMT on the entire functionally classified roadway
network. However, given that the trucks use interstates more heavily than cars, this factor
is adjusted to 27.3 percent. This adjustment is based on the origin-destination information
obtained during the trip characteristics surveys.
Fuel Efficiency
The fuel efficiency level is used to calculate the gas tax credit component of the
transportation impact fee. The fuel efficiency fib'1lre used in the Collier County
Transportation Impact Fee Final Report, Februmy 2009 calculated a combined fuel
efficiency for cars, vans, and trucks, and resulted in 17.85 miles per gallon. Given that the
fuel efficiency of trucks is lower than cars and vans, a separate fib'1lre is calculated for the
mines. A fuel efficiency level of 5.90 miles per gallon is calculated for mines, which
increased the gas tax credit and reduced the impact fee.
Tindale-Oliver & Associates, Inc.
May 2009
B-3
Collier County
Mines Trip Characteristics Study