Geotechnical_Report_PIE_Parking_North_and_South_Lots.pdf

TIERRA

7351 Temple Terrace Highway Tampa, FL 33637

Phone (813) 989-1354 Fax (813) 989-1355

July 22, 2022

Mead & Hunt 2203 N Lois Ave #225 Tampa, FL 33607

Attn: Mr. Dave Schmidgall, P.E.

RE: Report of Geotechnical Engineering Services

St. Pete-Clearwater International Airport

Parking Lot Expansion and Modifications – North and South Lots

Pinellas County, Florida

Tierra Project No. 6511-20-183-001

Mr. Schmidgall:

Tierra, Inc. has completed the geotechnical engineering study for the above referenced project. The results of our field exploration program are presented in this report.

Should there be any questions regarding the report, please do not hesitate to contact our office at (813) 989-1354. Tierra would be pleased to continue providing geotechnical services throughout the implementation of the project. We look forward to working with you on this and future projects.

Respectfully Submitted, TIERRA, INC.

Tyler R. Jean, E.I. Daniel R. Ruel, P.E.

Geotechnical Engineer Intern Geotechnical Engineer

Florida License No. 82404

Kevin H. Scott, P.E.

Senior Geotechnical Engineer Florida License No. 65514

TABLE OF CONTENTS

PROJECT DESCRIPTION

Project Information

Scope of Services/Objective

SUBSURFACE CONDITIONS

General Site Information

Pinellas County Soil Survey

RESULTS OF SUBSURFACE EXPLORATION

Groundwater Information

Field Permeability Tests

EVALUATION AND RECOMMENDATIONS

Results of Soil Borings

On-Site Suitability

REPORT LIMITATIONS

APPENDIX

Boring Location Plan Soil Profiles Drainage Design Parameters

Report of Geotechnical Engineering Services

Parking Lot Expansion and Modifications – North and South Lots

Pinellas County, Florida

PROJECT DESCRIPTION

Project Information

The project site is located at St. Pete-Clearwater International Airport in Pinellas County, Florida. The project consists of improvements to two parking lots (designated herein as “North” and “South”), located on the north side of Fairchild Drive and in the southeast quadrant of the intersection of 144th Ave North and 46th St North, respectively. This report has been developed to provide geotechnical support through soil sampling, Standard Penetration Test (SPT) borings, hand auger borings and laboratory testing. Tierra is developing a supplemental letter report to support the potential reuse of asphalt millings in the North Parking Lot.

Scope of Services/Objective

The objective of our study was to obtain information concerning current parking lot and subsurface conditions in order to obtain data to support the project design. In order to meet the preceding objectives, we provided the following services:

1. Reviewed published soils and topographic information. This published information was from the appropriate Florida Quadrangle Map published by the United States Geological Survey (USGS), as well as the Soil Survey of Pinellas County, Florida, published by the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS).

2. Executed a program of subsurface exploration consisting of soil sampling, borings, subsurface sampling and field testing.

3. Visually classified the soil samples in the laboratory using the Unified Soil Classification System (USCS). Identified soil conditions at each boring location.

4. Collected groundwater level measurements. Estimated the Seasonal High Groundwater level at selected boring locations.

5. Prepared this engineering report in accordance with the project Scope of Services and our proposal, which summarizes the course of study pursued, the field and laboratory data generated, subsurface conditions encountered, and our engineering evaluations in each of the pertinent topic areas.

The scope of our services did not include an environmental assessment for determining the presence or absence of wetlands or hazardous or toxic materials in the soil, bedrock, groundwater, or air, on or below or around this site. The scope of our services did not include determination of the potential for sinkhole activity. Any statements in this report or on the boring logs regarding odors, colors, unusual or suspicious items or conditions are strictly for the information of our client.

Parking Lot Expansion and Modifications – North and South Lots

Pinellas County, Florida

SUBSURFACE CONDITIONS

General Site Information

Based on a review of the “Safety Harbor, Florida” United States Geological Survey (USGS) Quadrangle Map, the natural ground elevation at the parking lot sites ranges from approximately +5 to +15 feet, National Geodetic Vertical Datum of 1929 (NGVD 29).

Pinellas County Soil Survey

Based on a review of the Pinellas County Soil Survey, it appears that there are two (2) primary soil-mapping units noted within the project footprints. The general soil descriptions are presented in the following paragraphs and table, as described in the Soil Survey.

North Lot - Matlacha and St. Augustine – Urban Land (Soil Map Unit 16): The Matlacha component makes up 32 percent of the map unit. Slopes are 0 to 2 percent. This component is on fills on ridges on marine terraces on coastal plains. The parent material consists of sandy mine spoil or earthy fill. Depth to a root restrictive layer is greater than 60 inches. The natural drainage class is somewhat poorly drained. Water movement in the most restrictive layer is high. Available water to a depth of 60 inches (or restricted depth) is low. Shrink-swell potential is low. This soil is not flooded or ponded. A seasonal zone of water saturation is at 30 inches during June, July, August, September, and October.

South Lot - Myakka – Urban Land (Soil Map Unit 17): The Myakka component makes up 50 percent of the map unit. Slopes are 0 to 2 percent. This component is on flatwoods on marine terraces on coastal plains. The parent material consists of sandy marine deposits.

Depth to a root restrictive layer is greater than 60 inches. The natural drainage class is poorly drained. Water movement in the most restrictive layer is moderately high. Available water to a depth of 60 inches (or restricted depth) is low. Shrink-swell potential is low. This soil is not flooded or ponded. A seasonal zone of water saturation is at 12 inches during June, July, August, September, October, and November. Organic matter content in the surface horizon is about 4 percent.

The Urban Land component of these soil types consists of areas where most of the soil surface is covered with impervious materials, such as buildings and paved areas. This land type consists of areas where the original soil has been modified through cutting, grading, filling, and shaping or has been altered for urban development.

It should be noted that information contained in the USDA NRCS Soil Survey may not be reflective of current subsurface conditions, particularly if recent development in the project vicinity has modified existing soils or surface/subsurface drainage.

Parking Lot Expansion and Modifications – North and South Lots

Pinellas County, Florida

RESULTS OF SUBSURFACE EXPLORATION

The subsurface conditions were explored using six (6) SPT borings performed to depths ranging from approximately 10 to 20 feet below existing and twelve (12) hand auger borings performed to depths ranging from approximately 5 to 5½ feet below existing grade.

Tierra utilized coring barrels, breaker bars, and hand auger equipment to retrieve the asphalt milling samples that had been hardened in place by traffic.

The soil boring locations were recorded in the field by a representative of Tierra using hand held Global Positioning System (GPS) devices with a reported accuracy of ±10 feet. The approximate boring locations are presented on the Boring Location Plan in the

Appendix.

The SPT borings were performed with the use of a drill rig using Bentonite Mud drilling procedures. The soil sampling was performed in general accordance with ASTM test designation D-1586. Within the SPT borings performed, the initial 4 feet were manually advanced by hand auger to verify utility clearances. SPT resistance N-values were then taken continuously to a depth of 10 feet and on intervals of 5 feet thereafter to the boring termination depths. The results of the SPT borings performed are presented on the Soil

Profiles sheets in the Appendix.

The soil strata encountered in the borings performed at the project site are summarized in the following table.

Stratum Number

Soil Description

USCS

Classification Symbol

1 Light Brown to Gray SAND to SAND with Silt SP/SP-SM

2 Light Gray to Green-Gray Silty SAND SM

The subsurface soil stratification is of a generalized nature to highlight the major subsurface stratification features and material characteristics. The soil profiles included in the Appendix should be reviewed for specific information at individual boring locations.

These profiles include soil descriptions, stratifications, and penetration resistance values when applicable. The stratifications shown on the boring profiles represent the conditions only at the actual boring location. Variations did occur and should be expected between boring locations. The stratifications represent the approximate boundary between subsurface materials and the actual transition may be gradual.

Groundwater Information

The groundwater table, when encountered, was measured at depths ranging from 2 feet to 5 feet below the ground surface at the locations tested. The encountered groundwater levels are presented adjacent to the soil profiles in the Appendix. The Seasonal High

Parking Lot Expansion and Modifications – North and South Lots

Pinellas County, Florida

Groundwater Table (SHGWT) was estimated at selected boring locations. The SHGWT estimates are presented on the Soil Profiles sheets and summarized in the Drainage

Design Parameters table in the Appendix.

It should be noted that groundwater levels tend to fluctuate during periods of prolonged drought and extended rainfall and may be affected by man-made influences. In addition, a seasonal effect can also occur in which higher groundwater levels are normally recorded in rainy seasons.

Field Permeability Tests

Tierra performed four (4) constant head field permeability tests (open-end pipe hydraulic conductivity tests; U.S. Bureau of Reclamation Test Designation E-18, 1974) within the proposed drainage improvement areas. The tests were performed at depths ranging from 18 to 24 inches below the existing ground surface within Stratum 1 soils. The tests were performed and the results evaluated in general accordance with the methodology presented in the FDOT Soils and Foundations Handbook. The Hydraulic Conductivity

Test Results are presented in the Appendix of this report.

It is important to note that the results provided are the measured hydraulic conductivity rates of the in-situ soil conditions encountered at the time of our field activities. No reduction, limiting value, or factors of safety have been applied to these rates. The project drainage engineer should apply an appropriate factor of safety for design and evaluation purposes.

EVALUATION AND RECOMMENDATIONS

Results of Soil Borings

The Boring Location Plan and Soil Profiles included in the Appendix should be reviewed for specific soil information at each location tested. The borings generally encountered sandy soils with varying amounts of silt the to boring termination depths.

On-Site Suitability

The suitability of soil for reuse in the project should be evaluated against the project engineering fill requirements. Variations in the subsurface stratification should be expected between borings. All fill should be placed in accordance with the recommendations provided in this report and jurisdictional requirements.

In general, the sandy soil in Stratum 1 (SP/SP-SM) may be moved and used for grading purposes, site leveling, general engineering fill, and backfill in other areas, provided the fill is free of organic materials, clay, debris and/or other material deemed unsuitable for construction. Stratum 2 (SM) soils are moisture sensitive and may be difficult to compact.

They should only be used above the water table at the time of construction. The

Parking Lot Expansion and Modifications – North and South Lots

Pinellas County, Florida subsurface soil conditions encountered are presented on the Soil Profiles sheets in the

Appendix.

REPORT LIMITATIONS

The data contained in this report are opinions based on the site conditions and project layout described herein and further assume that the conditions observed in the exploratory investigations are representative of the subsurface conditions throughout the site, i.e., the subsurface conditions elsewhere on the site are the same as those disclosed herein. If, during construction, subsurface conditions different from those encountered in the exploratory investigations are observed or appear to be present, we should be advised at once so that we can review these conditions and reconsider our recommendations where necessary.

This report was prepared for the exclusive use of Mead & Hunt and their client for evaluating the design of the project as it relates to the geotechnical aspects discussed herein. It should be made available to prospective contractors for information on factual data only and not as a warranty of subsurface conditions included in this report.

Unanticipated pavement and soil conditions may require that additional expense be made to attain a properly constructed project. Therefore, some contingency fund is recommended to accommodate such potential extra costs.

APPENDIX

Boring Location Plan

Soil Profiles

Drainage Design Parameters

N:1300659.34

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B-6N

B-1N

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C-2N C-3N

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B-4 (PERM)

B-5 (PERM)

B-1 (PERM)

B-2N

FRONTAGE RD.

ROOSEVELT BLVD.

FAIRCHILD DR.

NOTE: BASE MAP PROVIDED BY MEAND & HUNT, INC.

PLAN SCALE

0 100'

BORING LOCATION PLAN

LEGEND

APPROXIMATE LOCATION OF AUGER BORING

APPROXIMATE LOCATION OF SPT BORING

SHEET CONTENTS

DO NOT SCALE DRAWINGS

M&H NO.:

DATE:

DESIGNED BY:

DRAWN BY:

CHECKED BY:

ISSUED

SHEET NO.

Mead and Hunt, Inc.

© Copyright 2022 Mead & Hunt, Inc.

This document, or any portion thereof, shall not be duplicated, disclosed, or used on any other project or extension of this project except by written agreement with Mead &

Hunt, Inc. Mead & Hunt shall not be responsible for any unauthorized use of, or alteration to these documents.

2440 Deming Way

Middleton, WI 53562 phone: 608-273-6380 meadhunt.com

JULY 2022

SW

SW

DRR

BORING LOCATION PLAN (1)

TIERRA

7351 Temple Terrace Highway Tampa, Florida 33637 Phone: 813-989-1354 Fax: 813-989-1355

AutoCAD SHX Text 8.5

N:1297858.82

E:431299.89

10'

8'

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E:431294.82

N:1297848.27

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N:1297787.22

E:431462.14

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P-1

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C-3S

C-1S

C-4S

T H

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144TH AVE. N

NOTE: BASE MAP PROVIDED BY MEAND & HUNT, INC.

PLAN SCALE

0 100'

BORING LOCATION PLAN

LEGEND

APPROXIMATE LOCATION OF AUGER BORING

APPROXIMATE LOCATION OF SPT BORING

SHEET CONTENTS

DO NOT SCALE DRAWINGS

M&H NO.:

DATE:

DESIGNED BY:

DRAWN BY:

CHECKED BY:

ISSUED

SHEET NO.

Mead and Hunt, Inc.

© Copyright 2022 Mead & Hunt, Inc.

This document, or any portion thereof, shall not be duplicated, disclosed, or used on any other project or extension of this project except by written agreement with Mead &

Hunt, Inc. Mead & Hunt shall not be responsible for any unauthorized use of, or alteration to these documents.

2440 Deming Way

Middleton, WI 53562 phone: 608-273-6380 meadhunt.com

JULY 2022

SW

SW

DRR

BORING LOCATION PLAN (2)

TIERRA

7351 Temple Terrace Highway Tampa, Florida 33637 Phone: 813-989-1354 Fax: 813-989-1355

SOIL PROFILES

A - WITH LIMESTONE FRAGMENTS

SP

N

ESTIMATED SEASONAL HIGH GROUNDWATER TABLE

HA

GNE GROUNDWATER TABLE NOT ENCOUNTERED

P

HAND AUGERED TO VERIFY UTILITY CLEARANCES

SPT N-VALUE IN BLOWS/FOOT FOR 12 INCHES OF

PENETRATION (UNLESS OTHERWISE NOTED)

UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D 2488)

GROUP SYMBOL AS DETERMINED BY VISUAL REVIEW

15 to 30 8 to 15

30 to 50 10 to 30 4 to 10

(BLOWS/FT.)

SPT N-VALUE

(BLOWS/FT.)

SPT N-VALUE

GREATER THAN 30

LESS THAN 4

GREATER THAN 50

LESS THAN 2

VERY LOOSE

HARD

VERY STIFF

STIFF

SILTS AND CLAYS

CONSISTENCY

FIRM

SOFT

VERY SOFT

LOOSE

DENSE

VERY DENSE

4 to 8 2 to 4

RELATIVE DENSITY

GRANULAR MATERIALS-

SAFETY HAMMER

MEDIUM DENSE

AUTOMATIC HAMMER

12 to 24 6 to 12

24 to 40 8 to 24 3 to 8

(BLOWS/FT.)

SPT N-VALUE

(BLOWS/FT.)

SPT N-VALUE

GREATER THAN 24

LESS THAN 3

GREATER THAN 40

LESS THAN 1

3 to 6 1 to 3

LEGEND

ASPHALT MILLINGS

LIGHT GRAY TO GREEN-GRAY SILTY SAND (SM)

LIGHT BROWN TO GRAY SAND TO SAND WITH SILT (SP/SP-SM)

GROUNDWATER LEVEL ENCOUNTERED DURING

INVESTIGATION0

D E

P T

H

IN

F E

E T

P

BOR # C-1N

EASTING 430693

NORTHING 1300302

DATE 6/20/2022

P

GNE

BOR # C-2N

EASTING 430852

NORTHING 1300480

DATE 6/20/2022

P

BOR # C-3N

EASTING 431090

NORTHING 1300275

DATE 6/20/2022

P

BOR # C-4N

EASTING 430944

NORTHING 1300084

DATE 6/20/2022

1A

N

HA

HA

BOR # B-1N

EASTING 431240

NORTHING 1300001

DATE 6/20/2022

DRILLER A. JACKSON

HAMMER AUTOMATIC

RIG D-25

1A

N

HA

HA

BOR # B-2N

EASTING 431199

NORTHING 1300529

DATE 6/20/2022

DRILLER A. JACKSON

HAMMER AUTOMATIC

RIG D-25

N

HA

HA

BOR # B-3N

EASTING 430880

NORTHING 1300654

DATE 6/20/2022

DRILLER A. JACKSON

HAMMER AUTOMATIC

RIG D-25

1A

N

HA

HA

BOR # B-4N

EASTING 431266

NORTHING 1300356

DATE 6/20/2022

DRILLER A. JACKSON

HAMMER AUTOMATIC

RIG D-25

N

HA

HA

BOR # B-5N

EASTING 431288

NORTHING 1300146

DATE 6/20/2022

DRILLER A. JACKSON

HAMMER AUTOMATIC

RIG D-25

1A

N

HA

HA

BOR # B-6N

EASTING 431115

NORTHING 1299954

DATE 6/20/2022

DRILLER A. JACKSON

HAMMER AUTOMATIC

RIG D-25

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SHEET CONTENTS

DO NOT SCALE DRAWINGS

M&H NO.:

DATE:

DESIGNED BY:

DRAWN BY:

CHECKED BY:

ISSUED

SHEET NO.

Mead and Hunt, Inc.

© Copyright 2022 Mead & Hunt, Inc.

This document, or any portion thereof, shall not be duplicated, disclosed, or used on any other project or extension of this project except by written agreement with Mead &

Hunt, Inc. Mead & Hunt shall not be responsible for any unauthorized use of, or alteration to these documents.

2440 Deming Way

Middleton, WI 53562 phone: 608-273-6380 meadhunt.com

JULY 2022

SW

SW

DRR

SOIL PROFILES (1)

TIERRA

7351 Temple Terrace Highway Tampa, Florida 33637 Phone: 813-989-1354 Fax: 813-989-1355

GNE

(4 IN) (5 IN) (4 IN) (5 IN)

BOR # B-1 (PERM)

EASTING 431246

NORTHING 1299998

DATE 6/20/2022

BOR # B-4 (PERM)

EASTING 431273

NORTHING 1300369

DATE 6/20/2022

BOR # B-5 (PERM)

EASTING 431278

NORTHING 1300136

DATE 6/20/2022

NORTH PARKING LOT

D E

P T

H

IN

F E

E T

SOIL PROFILES

SHEET CONTENTS

DO NOT SCALE DRAWINGS

M&H NO.:

DATE:

DESIGNED BY:

DRAWN BY:

CHECKED BY:

ISSUED

SHEET NO.

Mead and Hunt, Inc.

© Copyright 2022 Mead & Hunt, Inc.

This document, or any portion thereof, shall not be duplicated, disclosed, or used on any other project or extension of this project except by written agreement with Mead &

Hunt, Inc. Mead & Hunt shall not be responsible for any unauthorized use of, or alteration to these documents.

2440 Deming Way

Middleton, WI 53562 phone: 608-273-6380 meadhunt.com

JULY 2022

SW

SW

DRR

SOIL PROFILES (2)

TIERRA

7351 Temple Terrace Highway Tampa, Florida 33637 Phone: 813-989-1354 Fax: 813-989-1355

LEGEND

A - WITH LIMESTONE FRAGMENTS

SP

N

ESTIMATED SEASONAL HIGH GROUNDWATER TABLE

HA

GNE GROUNDWATER TABLE NOT ENCOUNTERED

P

HAND AUGERED TO VERIFY UTILITY CLEARANCES

SPT N-VALUE IN BLOWS/FOOT FOR 12 INCHES OF

PENETRATION (UNLESS OTHERWISE NOTED)

UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D 2488)

GROUP SYMBOL AS DETERMINED BY VISUAL REVIEW

ASPHALT MILLINGS

LIGHT GRAY TO GREEN-GRAY SILTY SAND (SM)

LIGHT BROWN TO GRAY SAND TO SAND WITH SILT (SP/SP-SM)

GROUNDWATER LEVEL ENCOUNTERED DURING

INVESTIGATION

P

GNE

BOR # C-1S

EASTING 431700

NORTHING 1297872

DATE 6/20/2022

P

GNE

BOR # C-2S

EASTING 431250

NORTHING 1297878

DATE 6/20/2022

(5 IN) (4 IN) P

BOR # C-3S

EASTING 431376

NORTHING 1297827

DATE 6/20/2022

P

GNE

BOR # C-4S

EASTING 431371

NORTHING 1297518

DATE 6/20/2022

BOR # P-1

EASTING 431353

NORTHING 1297426

DATE 6/20/2022

D E

P T

H

IN

F E

E T

D E

P T

H

IN

F E

E T

(3 IN)

(3 IN)

D E

P T

H

IN

F E

E T

15 to 30 8 to 15

30 to 50 10 to 30 4 to 10

(BLOWS/FT.)

SPT N-VALUE

(BLOWS/FT.)

SPT N-VALUE

GREATER THAN 30

LESS THAN 4

GREATER THAN 50

LESS THAN 2

VERY LOOSE

HARD

VERY STIFF

STIFF

SILTS AND CLAYS

CONSISTENCY

FIRM

SOFT

VERY SOFT

LOOSE

DENSE

VERY DENSE

4 to 8 2 to 4

RELATIVE DENSITY

GRANULAR MATERIALS-

SAFETY HAMMER

MEDIUM DENSE

AUTOMATIC HAMMER

12 to 24 6 to 12

24 to 40 8 to 24 3 to 8

(BLOWS/FT.)

SPT N-VALUE

(BLOWS/FT.)

SPT N-VALUE

GREATER THAN 24

LESS THAN 3

GREATER THAN 40

LESS THAN 1

3 to 6 1 to 3

SOUTH PARKING LOT

Easting Northing

Approximate

Test Depth

(feet)

Stratum

Tested

In-Situ Hydraulic

Conductivity, K (3)

(feet/day)

P-1 431353 1297426 6/20/2022 2.0 1.5 1 12.0 ≥5.0

B-1 431246 1299998 6/20/2022 2.5 2.0 1 >40.0 ≥10.0

B-4 431273 1300369 6/20/2022 2.5 2.0 1 >40.0 ≥10.0

B-5 431278 1300136 6/20/2022 2.5 2.0 1 >40.0 ≥10.0

The boring/test locations should be considered approximate.

(2)

Seasonal High Groundwater Table (SHGWT) estimated based on soil stratigraphy, measured groundwater levels from the borings, the Pinellas County, Florida USDA soil survey information and past experience with similar soil conditions.

(3)

The hydraulic conductivity values provided are measured in-situ field rates. These values are not factored and are only for the Stratum 1 (SP/SP-SM) soils encountered. The drainage engineer should apply an appropriate factor of safety, as applicable.

(1) The boring/test locations were determined in the field using hand-held, non-survey grade Garmin eTrex® Global Positioning System (GPS) equipment with a manufacturer's reported accuracy of ± 10 feet.

Permeability Test Results Depth to

Confining Layer

(feet)

Boring/Test Locations (1)

(FL West NAD 83) Boring

Name

Date

Recorded

Estimated

SHGWT Depth (2)

(feet)

SOUTH LOT

NORTH LOT

Drainage Design Parameters

PIE Parking

Pinellas County, Florida

Tierra Project No.: 6511-20-183.001