24-8250_Exhibit_M_-_Geotechnical_Report_GES_Renaissance_Hall_at_Old_Course___Langan.pdf

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Golden Gate Golf Course Outfall Swale
Solicitation number
24-8250
Issued by
Collier County, Florida

About this file

The document is a geotechnical engineering study prepared by Langan Engineering and Environmental Services for Rural Neighborhoods, Inc., focusing on the Renaissance Hall at Old Course project located in Naples, Florida. The study investigates the subsurface conditions of a approximately 25-acre site formerly used as a golf course, situated within Section 27, Township 49 South, Range 26 East, bounded by Collier Boulevard and 32nd Avenue SW. The investigation involved fifteen Standard Penetration Test (SPT) borings and ten test pits, conducted between April 12-14, 2023, to evaluate soil strata, groundwater levels, and provide foundation support recommendations for a proposed residential development consisting of nine three-story multi-family buildings.

The geotechnical report reveals a stratified subsurface profile comprising four primary layers: a thin topsoil layer, sand with silt and limestone, limestone, and sandy silt with varying limestone and clay content. Groundwater levels were observed between el +1 and +5 feet NAVD, with seasonal fluctuations. The study recommends specific foundation support strategies, including shallow foundation systems bearing at approximately el +9.7 to +10.2 feet, with a suggested allowable bearing pressure of 4,000 psf. The report also provides detailed guidance on site preparation, including clearing, excavation, fill placement, and compaction requirements, with considerations for potential ground improvement techniques and construction monitoring to ensure proper implementation of the geotechnical recommendations.

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Descriptive Terminology of Soil Based on Standards ASTM D2487/2488

(Unified Soil Classification System)

Group Symbol Group NameB

Cu 4 and 1 Cc 3D GW Well graded gravelE

Cu < 4 and/or (Cc< 1 or Cc > 3) D GP Poorly graded gravelE

Fines classify as ML or MH GM Silty gravelE F G

Fines Classify as CL or CH GC Clayey gravelE F G

Cu 6 and 1 Cc 3D SW Well graded sandI

Cu < 6 and/or (Cc<1 or Cc > 3) D SP Poorly graded sandI

Fines classify as ML or MH SM Silty sandF G I

Fines classify as CL or CH SC Clayey sandF G I

CL Lean clayK L M

PI < 4 or plots below "A" lineJ ML SiltK L M

Organic OL

CH Fat clayK L M

MH Elastic siltK L M

Organic OH

PT PeatHighly Organic Soils

Silts and Clays (Liquid limit less than

50)

Silts and Clays (Liquid limit 50 or more)

Primarily organic matter, dark in color, and organic odor

Inorganic

Inorganic

PI > 7 and plots on or above "A" lineJ

PI plots on or above "A" line

PI plots below "A" line

Criteria for Assigning Group Symbols and

Group Names Using Laboratory TestsA Soil Classification

Sands (50% or more coarse fraction passes No. 4 sieve)

Clean Gravels

(Less than 5% finesC)

Gravels with Fines

(More than 12% finesC)

Clean Sands

(Less than 5% finesH)

Sands with Fines

(More than 12% finesH)

Gravels (More than 50% of coarse fraction retained on No. 4 sieve)

Liquid Limit oven dried Liquid Limit not dried

<0.75 Organic clay K L M N

Organic silt K L M O

Liquid Limit oven dried Liquid Limit not dried

<0.75 Organic clay K L M P

Organic silt K L M Q

Particle Size Identification Boulders.............. over 12" Cobbles................ 3" to 12" Gravel

Coarse............. 3/4" to 3" (19.00 mm to 75.00 mm) Fine................. No. 4 to 3/4" (4.75 mm to 19.00 mm)

Sand Coarse.............. No. 10 to No. 4 (2.00 mm to 4.75 mm) Medium........... No. 40 to No. 10 (0.425 mm to 2.00 mm) Fine.................. No. 200 to No. 40 (0.075 mm to 0.425 mm)

Silt........................ No. 200 (0.075 mm) to .005 mm Clay...................... < .005 mm

Relative ProportionsL, M trace............................. 0 to 5% little.............................. 6 to 14% with.............................. 15%

Inclusion Thicknesses lens............................... 0 to 1/8" seam............................. 1/8" to 1" layer.............................. over 1"

Apparent Relative Density of Cohesionless Soils Very loose ..................... 0 to 4 BPF Loose ............................ 5 to 10 BPF Medium dense.............. 11 to 30 BPF Dense............................ 31 to 50 BPF Very dense.................... over 50 BPF

A. Based on the material passing the 3 inch (75 mm) sieve.

B. If field sample contained cobbles or boulders, or both, add "with cobbles or boulders, or both" to group name.

C. Gravels with 5 to 12% fines require dual symbols:

GW GM well graded gravel with silt GW GC well graded gravel with clay GP GM poorly graded gravel with silt GP GC poorly graded gravel with clay

D. Cu = D60 / D10 Cc = 30 2 / 10 60)

E. If soil contains 15% sand, add "with sand" to group name.

F. If fines classify as CL ML, use dual symbol GC GM or SC SM.

G. If fines are organic, add "with organic fines" to group name.

H. Sands with 5 to 12% fines require dual symbols:

SW SM well graded sand with silt SW SC well graded sand with clay SP SM poorly graded sand with silt SP SC poorly graded sand with clay

I. If soil contains 15% gravel, add "with gravel" to group name.

J. If Atterberg limits plot in hatched area, soil is CL ML, silty clay.

K. If soil contains 15 to < 30% plus No. 200, add "with sand" or "with gravel", whichever is predominant.

L. If soil contains 30% plus No. 200, predominantly sand, add to group name.

M. If soil contains 30% plus No. 200 predominantly gravel, add to group name.

N. PI 4 and plots on or above line.

O. PI < 4 or plots below line.

P. PI plots on or above line.

Q. PI plots below line.

Laboratory Tests DD Dry density, pcf qp Pocket penetrometer strength, tsf WD Wet density, pcf qU Unconfined compression test, tsf P200 % Passing #200 sieve LL Liquid limit MC Moisture content, % PL Plastic limit OC Organic content, % PI Plasticity index

Consistency of Blows Approximate Unconfined Cohesive Soils Per Foot Compressive Strength Very soft................... 0 to 1 BPF................... < 0.25 tsf Soft........................... 2 to 4 BPF................... 0.25 to 0.5 tsf Medium.................... 5 to 8 BPF .................. 0.5 to 1 tsf Stiff........................... 9 to 15 BPF................. 1 to 2 tsf Very Stiff................... 16 to 30 BPF............... 2 to 4 tsf Hard.......................... over 30 BPF................ > 4 tsf

Drilling Notes:

Blows/N value: Blows indicate the driving resistance recorded for each 6 inch interval. The reported N value is the blows per foot recorded by summing the second and third interval in accordance with the Standard Penetration Test, ASTM D1586.

Partial Penetration: If the sampler could not be driven through a full 6 inch interval, the number of blows for that partial penetration is shown as #/x" (i.e. 50/2"). The N value is reported as "REF" indicating refusal.

Recovery: Indicates the inches of sample recovered from the sampled interval. For a standard penetration test, full recovery is 18", and is 24" for a thinwall/shelby tube sample.

WOH: Indicates the sampler penetrated soil under weight of hammer and rods alone; driving not required.

WOR: Indicates the sampler penetrated soil under weight of rods alone; hammer weight and driving not required.

Water Level: Indicates the water level measured by the drillers either while drilling ( ), at the end of drilling ( ), or at some time after drilling ( ).

Moisture Content:

Dry: Absence of moisture, dusty, dry to the touch.

Moist: Damp but no visible water.

Wet: Visible free water, usually soil is below water table.

5/2021

Client: Langan Engineering Project: Renaissance Hall at Old Course Location: Naples, FL Project No: GTX-317142 Boring ID: LB-12 Sample ID: S-8 Depth : 23-25'

Sample Type: bag Test Date: 05/02/23 Test Id: 713791

Tested By: ckg Checked By: ank

Test Comment: --- Visual Description: Wet, gray clay with sand Sample Comment: ---

Particle Size Analysis - ASTM D

0.0010.010.11101001000

Grain Size (mm)

% Cobble

% Gravel

% Sand

% Silt & Clay Size

Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

Hydrometer

Particle Size (mm)

0.0288

0.0184

0.0108

0.0079

0.0058

0.0043

0.0031

0.0013

Percent Finer

Spec. Percent Complies

Coefficients D =N/A85

D =N/A60

D =0.0106 mm50

D =0.0046 mm30

D =N/A15

D =N/A10

C =N/Au C =N/Ac

Classification

ASTM N/A

AASHTO ()

Sample/Test Description Dispersion Device : Apparatus A - Mech Mixer

Dispersion Period : 1 minute

Est. Specific Gravity : 2.65

Separation of Sample: #200 Sieve

Location: Naples, FL Project No: GTX-317142 Boring ID: LB-2 Sample ID: S-8 Depth : 18-20'

Sample Type: bag Test Date: 05/02/23 Test Id: 713789

Tested By: ckg Checked By: ank

Test Comment: --- Visual Description: Wet, very pale brown silty clay with sand Sample Comment: ---

Particle Size Analysis - ASTM

0.0010.010.11101001000

Grain Size (mm)

% Cobble

% Gravel

% Sand

% Silt & Clay Size

Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

Hydrometer

Particle Size (mm)

0.0324

0.0205

0.0121

0.0087

0.0063

0.0046

0.0033

0.0014

Percent Finer

Spec. Percent Complies

Coefficients D =N/A85

D =N/A60

D =0.0283 mm50

D =0.0081 mm30

D =0.0039 mm15

D =0.0018 mm10

C =N/Au C =N/Ac

Classification

ASTM N/A

AASHTO ()

Sample/Test Description Dispersion Device : Apparatus A - Mech Mixer

Dispersion Period : 1 minute

Location: Naples, FL Project No: GTX-317142 Boring ID: LB-7 Sample ID: S-10 Depth : 18-20'

Sample Type: bag Test Date: 05/02/23 Test Id: 713790

Tested By: ckg Checked By: ank

Test Comment: --- Visual Description: Moist, very pale brown silty clayey sand Sample Comment: ---

Particle Size Analysis - ASTM

0.0010.010.11101001000

Grain Size (mm)

% Cobble

% Gravel

% Sand

% Silt & Clay Size

Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

Hydrometer

Particle Size (mm)

0.0291

0.0194

0.0115

0.0084

0.0062

0.0045

0.0032

0.0014

Percent Finer

Spec. Percent Complies

Coefficients D =N/A85

D =N/A60

D =0.0278 mm50

D =0.0078 mm30

D =0.0040 mm15

D =0.0022 mm10

C =N/Au C =N/Ac

Classification

ASTM N/A

AASHTO ()

Sample/Test Description Dispersion Device : Apparatus A - Mech Mixer

Dispersion Period : 1 minute

Location: Naples, FL Project No: GTX-317142 Boring ID: LB-12 Sample ID: S-8 Depth : 23-25'

Sample Type: bag Test Date: 05/01/23 Test Id: 713788

Tested By: cam Checked By: ank

Test Comment: --- Visual Description: Wet, gray clay with sand Sample Comment: ---

Atterberg Limits - ASTM D4318

0 10 20 30 40 50 60 70 80 90 100

Liquid Limit

Plasticity Chart

ML or OLCL-ML

CL or OL

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

S-8 LB-12 23-25' 28 25 15 10 1.3

Sample Prepared using the WET method

Dry Strength: HIGH

Dilatancy: SLOW

Toughness: LOW

Location: Naples, FL Project No: GTX-317142 Boring ID: LB-2 Sample ID: S-8 Depth : 18-20'

Sample Type: bag Test Date: 05/01/23 Test Id: 713786

Tested By: cam Checked By: ank

Test Comment: --- Visual Description: Wet, very pale brown silty clay with sand Sample Comment: ---

Atterberg Limits - ASTM D4318

0 10 20 30 40 50 60 70 80 90 100

Liquid Limit

Plasticity Chart

ML or OLCL-ML

CL or OL

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

S-8 LB-2 18-20' 29 22 18 4 2.8

Sample Prepared using the WET method

Dry Strength: VERY HIGH

Location: Naples, FL Project No: GTX-317142 Boring ID: LB-7 Sample ID: S-10 Depth : 18-20'

Sample Type: bag Test Date: 05/01/23 Test Id: 713787

Tested By: cam Checked By: ank

Test Comment: --- Visual Description: Moist, very pale brown silty clayey sand Sample Comment: ---

Atterberg Limits - ASTM D4318

0 10 20 30 40 50 60 70 80 90 100

Liquid Limit

Plasticity Chart

ML or OLCL-ML

CL or OL

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

S-10 LB-7 18-20' 20 22 18 4 0.5

Sample Prepared using the WET method

Dry Strength: HIGH

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