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Engineering Analysis of Properties Designated within the City of Bonita Springs as

“Density Reduction/Groundwater Resource” (DR/GR) Land Use Category

CN 03-005

Greg F. Rawl, P.G.

CITY OF BONITA SPRINGSCITY OF BONITA SPRINGS

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Regional GeologicCross Sections

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Regional Geologic Cross Section A – A’

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Regional Geologic Cross Section B – B’

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Local GeologicCross Sections

E

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Local Geologic Cross Section E – E’

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Local GeologicCross Sections

F

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Local Geologic Cross Section F – F’

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Local GeologicCross Sections

H

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Local Geologic Cross Section H – H’

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Local GeologicCross Sections

K

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Local Geologic Cross Section K – K’

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Surficial Aquifer Water Level Contour Plot for

May of 2003 End of Dry Season

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Surficial Aquifer Water Levels Difference Plot Between May 2003 &

May 1992End of Dry Season

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Surficial Aquifer Water Level Contour Plot for

October of 2002End of Wet Season

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Surficial Aquifer Water Levels Difference Plot Between October 2002

& October 1991End of Wet Season

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Saline Water Intrusion MonitoringSouth Of Imperial R. & East of Old 41

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Lower Tamiami Aquifer Chloride

Concentration Plot for April 1989

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Lower Tamiami Aquifer Chloride

Concentration Plot for April 2001

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Lower Tamiami Aquifer Chloride

Concentration Plot for October 1989

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Lower Tamiami Aquifer Chloride

Concentration Plot for October 2001

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Summary of Literature Net Recharge Rates

Krulikas and Giese (USGS 1995) estimated 0.6 to 9.02 inches/year, with induced recharge rates greater than 9.02 inches/year possible.

Shoemaker et al (USGS 2003) estimated net recharge rates from -5.12 to 14.96 inches/year.

DHI Big Cypress Basin Integrated Hydrologic-Hydraulic Model, 2002 calculated 17.1 inches/year average for 1990 to 1995.

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SFWMD – Lower Tamiami Aquifer Average Recharge

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Shoemaker Simulated Net Recharge to Water Table Aquifer During March 1996

Source: Potential for Saltwater Intrusion into the Lower Tamiami Aquifer Near Bonita Springs, Southwestern FloridaUSGS Water Resource Investigations Report 03-4262

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Simulated Net Recharge to Water Table Aquifer During March 1996

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Net Recharge to Water Table – Steady State Dry Season

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Shoemaker Simulated Net Recharge to Water Table Aquifer During September 1996

Source: Potential for Saltwater Intrusion into the Lower Tamiami Aquifer Near Bonita Springs, Southwestern FloridaUSGS Water Resource Investigations Report 03-4262

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Simulated Net Recharge to Water Table Aquifer During September 1996

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Net Recharge to Water Table – Steady State Wet Season

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Average Net Rechargefor the Bonita Springs

Model Region is 2.27 Inches per Year

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Shoemaker Simulated Net Recharge to Water Table Aquifer During March 1996

Average Net Rechargefor the Bonita Springs

Model Region is 7.87 Inches per Year

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Shoemaker Simulated Net Recharge to Water Table Aquifer During September 1996

Average Net Rechargefor the Bonita Springs

Model Region is 5.31 Inches per Year

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Simulated Net Recharge to Water

Table – Average Annual Steady State

for 2000 to 2003

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Bonita DR/GR Aerials

Many existing land uses

95+% of land altered

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40

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Regional Geologic Cross Section C – C’

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Regional Geologic Cross Section D – D’

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Saline Water Intrusion Monitoring

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Soils Map

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Current Lee Co FLUM

DR/GR General

Interchange Resource

Protection Wetlands

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Surface Water Sites

Lee County sampling sites

ECT (Study) sampling sites

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Zn, 0.01 Class III Standard

0.000

0.020

0.040

0.060

Site 0 Site 1 Site 2 Site 3 Site 4

Zn

, in

mg

/L

Simulated Results ECT Median Sampling Results

ECT Mean Sampling Results Lee County

ECT Max ECT Min

Standard