22-B-0001_AfdLgt_RFI_LOG_FINAL_attachments_20210721.pdf

APPENDIX

Site Location Map

Fuel Cell and Corrosion Control Hangar New Jersey Air National Guard 177th Fighter Wing

Atlantic City International Airport Egg Harbor Township, Atlantic County, New Jersey

Corporate Headquarters

(610) 277-0880 FAX 277-0878

Southern New Jersey

403 Commerce Lane

West Berlin, NJ 08091

(856) 768-1001 FAX 768-1144

Central Pennsylvania

(717) 697-5701 FAX 697-5702

Lehigh Valley

(610) 967-4540 FAX 967-4488

eei@earthengineering.com www.earthengineering.com

August 21, 2015 EEI Project No. 27933.J0 Chris R. Jenkins, P.E.

Pond & Company 3500 Parkway Lane, Suite 600 Norcross, GA 30092

Re: Infiltration Testing Results Fuel Cell and Corrosion Control Hangar New Jersey Air National Guard 177th Fighter Wing

Atlantic City International Airport Egg Harbor Township, Atlantic County, New Jersey

Dear Mr. Jenkins:

Earth Engineering Incorporated (EEI) has completed Infiltration Testing to provide data for the design of the proposed storm water management system at the above-referenced project site.

I. INTRODUCTION

The objective of this project has been to obtain infiltration rates of the subgrade soils for the proposed storm water management basins at test areas designated by Pond & Company.

The scope of work for this project included test pits and the performance of in-situ infiltration testing. This letter presents the results of our work.

II. SITE DESCRIPTION

The site investigated is located at the New Jersey Air National Guard 177the Fighter Wing situated within the Atlantic City International Airport. The Air National Guard complex is accessed from Tilton Road which borders the property to the east. Buildings, facility and roads of the Air National Guard complex and Atlantic City International Airport surround all sides of the area investigated.

Two (2) storm water management areas are proposed for construction as part of development of the new Fuel Cell and Corrosion Control Hangar. One of the basins is proposed for construction in an existing grass area. The other storm water control feature will be constructed in the area of an existing grass lined storm water basin.

III. FIELD INVESTIGATION AND DISCUSSION

As part of the field test investigation, two (2) test pits were performed to complete the proposed scope of work. The test pits were excavated by Advantage Sitework LLC of Little Egg Harbor Township, New Jersey utilizing a back-hoe. Test pit TP-1 was performed within the area of an existing basin on June 24, 2015. It is noted that the surface of the existing basin at the time of the field investigation was dry.

Pond & Company

August 21, 2015

NJANG Fuel Cell and Corrosion Control Hangar - Infiltration Testing

Upon arrival, site personnel informed EEI that test pit TP-2 was located in an area underlain by fiber optic cables. The site personnel informed EEI that this test location was to be postponed until a later date until the private utilities could be marked. Therefore, after the utilities were marked, EEI returned the site on July 21, 2015 to complete the infiltration testing.

The test pit locations are shown on the Testing Location Plan, EEI Drawing No. 27933.J0-A- 101, attached to this letter.

The purpose of the exploratory test pits was to investigate for potential limiting zones below proposed drainage bed infiltration depths. Test pit logs providing the depth, thickness, and descriptions of the materials encountered are included in the Appendix. It is noted that each test pit was advanced to a depth where significant groundwater flow was occurring in the excavation. A limiting zone is defined as a horizon or condition of the soil or underlying strata which includes:

A. Seasonal high water table, whether perched or regional, determined by direct observation of the water table or soil mottling.

B. Rock with open joints, fractures or solution channels, masses of loose rock fragments including gravel, with insufficient fine soil to fill the voids between the fragments.

C. Rock formation, other stratum, or soil condition which is so slowly permeable that it effectively limits the downward passage of effluent.

The soils encountered within each test pit were visually classified and documented in the field during the investigation by a representative of EEI. A generalized soil profile consisting of sandy loam, loamy sand, and sand was concluded by EEI. In general, these soils are not representative of soil conditions that will ultimately prevent the downward passage of effluent.

The bedrock surface, which represents a limiting zone, was not encountered within the test pits to the depths achieved.

Groundwater which also represents a limiting zone was encountered in the test pit TP-1 at a depth of 11.5 feet below the existing ground surface. The infiltration test depth at this test location was performed at an approximate depth of 7.5 feet or 4 feet above the depth groundwater was encountered. Groundwater seepage was also encountered in the test pit TP- 2 at a depth of 7.0 feet below the existing ground surface. Significant groundwater flow was observed in test pit TP-2 at a depth of 11.0. The infiltration test depth at this test location was performed at an approximate depth of 5.0 feet or approximately 2 feet above the depth where groundwater seepage was encountered. It should be noted that the groundwater observations were made at the time of the field investigation and that groundwater table elevations may fluctuate with daily, seasonal, and climatic variations.

Soil mottling, which may be an indication of seasonal high groundwater, was not observed in test pit TP-1. Soil mottling was observed in test pit TP-2 at a depth of 7.0 feet or the same depth groundwater seepage was observed. As detailed above the infiltration test at this location was performed at a depth of 5.0 feet or 2 feet above the potential limiting zone.

Based upon field classification and observation of the site soils, evidence of limiting zones in the form of groundwater or soil mottling was observed at each exploratory testing location. A summary of the limiting zone information is provided in the following table.

August 21, 2015

TABLE I – LIMITING ZONE SUMMARY

Test Pit Designation

Ground Surface

Elevation (1)

(ft.)

Possible Limiting Zone Condition Depth of Limiting Zones

(ft.)

Elevation of Limiting

Zone (ft.)

Depth of Infiltration

Test (ft.)

TP-1 52.0 Water @ 11.5’ 11.5 40.5 7.5

TP-2 50.5 Water @ 7.0’, Soil Mottling @ 7.0’ 7.0 43.5 5.0

(1) Ground surface elevations were estimated using the topographic contours shown on the Grading Plan prepared by Pond & Company, dated 12/18/14.

IV. INFILTRATION TEST RESULTS

Following completion of the exploratory tests pits, two (2) double ring infiltration tests were performed adjacent to each test pit by EEI to determine infiltration rates for the on-site soils. The double ring infiltration tests were performed at depths of 5.0 and 7.5 feet below the existing ground surface. The in-situ infiltration was performed in general accordance with Appendix E of the New Jersey Stormwater Best Management Practices Manual (NJ BMP Manual). The following table summarizes the infiltration data for each test location. Detailed field information is shown on Table IA - Double Ring Infiltrometer Test Results, attached to this letter.

TABLE II - Double Ring Infiltrometer Test Results

Test Hole Number

Ground Surface

Elevation (feet)

Infiltration Depth (feet)

Infiltration Elevation

(feet)

Test Interval

(minutes)

Final Drop in Water Level

(inches)

Infiltration Rate

(inches/hour)

DRI-1A 52.0 7.5 44.5 5 5.0 60.0

DRI-1B 52.0 7.5 44.5 5 5.0 60.0

DRI-2A 50.5 5.0 45.5 30 0.125 0.25

DRI-2B 50.5 5.0 45.5 30 0.125 0.25

The infiltration rates shown above are field measured values and do not include a safety factor for design purposes. The determination of the appropriate design value for the storm water management features including application of the appropriate factors of safety is the responsibility of the project civil engineer.

EEI recommends performing in-situ infiltration testing following excavations to achieve the basin design elevations. This testing will serve to confirm design infiltration rates of the soils at the basin bottom elevations and can be used to delineate areas, if any, that require over-excavation of low or non-permeable soils.

August 21, 2015

V. LIMITATIONS

The information contained in this letter is based upon the subsurface data collected and on details stated in this letter. Should conditions arise which differ from those specifically stated herein, our office should be notified immediately so that our recommendations can be reviewed and revised, if necessary.

It is emphasized that this analysis was made for the test locations performed for the storm water management features proposed for construction as part of development of the new Fuel Cell and Corrosion Control Hangar at the New Jersey Air National Guard Complex. Earth Engineering Incorporated does not assume any responsibility in using this report for drainage system consideration or designs other than at the specific site addressed.

EEI appreciates the opportunity to be of service Pond & Company with this project. If additional information is required or there are questions regarding the contents discussed herein, please contact the undersigned.

Respectfully submitted, Earth Engineering Incorporated

Jim Ward, P.G.

Assistant Director - South Jersey Division

Thomas B. Louis, P.E.

Director - South Jersey Division New Jersey Professional Engineer

License Number GE 40918

11.5' 1/4 hr. Date: 6/24/2015

11.5' 1/2 hr. Date: 6/24/2015

Profile Description

0.0 to

0.7 Abrupt --- --- Sandy Loam Granular

0.7 to

1.1 Abrupt --- --- Sandy Loam Granular

1.1 to

2.8 Gradual --- --- Sandy Loam Granular

2.8 to

4.5 Abrupt --- --- Sandy Loam Granular

4.5 to

7.0 Gradual --- --- Loamy Sand Granular

7.0 to

12.0 -- --- --- Sand Granular

Compiled by: J. Polo

403 Commerce Lane, West Berlin, NJ 08054 Date Compiled: 7/6/2015

PHONE 856-768-1001 FAX 856-778-1144 Sheet Number: 1 of 1

Project Number: 27933.J0

Date of Testing: 6/24/2015

EEI Representative: J. Polo

Project Name: NJANG Fuel Cell / Corrosion Control Hangar

10YR 7/1 Light Gray Loose

Infiltration test depth at 7.5'. Secondary color (10YR 7/8

Yellow)

10YR 6/6 Brownish

Yellow Soft

10YR 7/2 Light Gray Loose

7.5YR 3/1 Very Dark

Gray Soft

Some roots, blended with topsoil

10YR 6/3 Pale Brown Soft

Texture Structure Consistence Remarks

10YR 5/4 Yellowish

Brown Loose

Topsoil (8")

Depth

(ft.)

Boundary Matrix Color Redox Mottles Mottle Color

Total Depth: 12.0' Additional Notes: Infiltration test depth at 7.5'.

Equipment Used: Back-hoe Initial Water Depth: Time:

Excavating Company: Advantage Sitework Subsequent Water Depth: Time:

Soil Description Log

Test Pit Location: TP-1 Ground Cover / Land Use: Grass covered, inside existing basin

Surface Elevation: ± 52.0' Limiting Zone: Groundwater encountered at 11.5'

7.0' seepage 1/4 hr. Date: 7/21/2015

11.0' flow 1/2 hr. Date: 7/21/2015

Profile Description

0.0 to

0.5 Abrupt -- -- Loamy Sand Granular

0.5 to

1.8 Abrupt -- -- Sand Granular

1.8 to

2.0 Gradual -- -- Loamy Sand Granular

2.0 to

2.7 Abrupt -- -- Sand Granular

2.7 to

2.9 Clear -- -- Sandy Loam

Granular/

Platy

2.9 to

4.5 Gradual -- -- Loamy Sand Granular

4.5 to

7.0 Gradual -- -- Sandy Loam

Granular/

Platy

7.0 to

11.5 Gradual Many, Distinct

10YR 7/8

Yellow Sand Granulare

Soil Description Log

Test Pit Location: TP-2 Ground Cover / Land Use: Grass covered

Surface Elevation: ± 50.5' Limiting Zone: Soil mottling 7.0' to 12.5', Groundwater seepage @ 7.0'

Equipment Used: Back-hoe Initial Water Depth: Time:

Excavating Company: Advantage Sitework Subsequent Water Depth: Time:

Total Depth: 12.5' Additional Notes: Infiltration test depth at 5.0'.

Depth

(ft.)

Boundary Matrix Color Redox Mottles Mottle Color Texture Structure Consistence Remarks

2.5 Y 4/2 Dark Grayish

Brown Friable

Topsoil (6")

2.5 Y 3/1 Very Dark

Gray Very Friable

10 YR 2/1 Black Friable

Topsoil with Roots

10 YR 6/1 Gray Very Friable

10 YR 2/2 Very Dark

Brown Loose

Topsoil with Roots

2.5Y 7/3 Pale Brown Loose

2.5Y 7/6 Yellow Loose

Infiltration test depth at 5.0'

10YR 7/1 Light Gray Loose

Project Name: NJANG Fuel Cell / Corrosion Control Hangar

Project Number: 27933.J0

Date of Testing: 7/21/2015

EEI Representative: J. Polo

Compiled by: J. Polo

403 Commerce Lane, West Berlin, NJ 08054 Date Compiled: 7/6/2015

PHONE 856-768-1001 FAX 856-778-1144 Sheet Number: 1 of 2

7.0' seepage 1/4 hr. Date: 7/21/2015

11.0' flow 1/2 hr. Date: 7/21/2015

Profile Description

11.5 to

12.5

Gradual Many, Distinct

7.5 YR 5/6

Strong

Brown

Sand Granular

403 Commerce Lane, West Berlin, NJ 08054 Date Compiled: 7/6/2015

PHONE 856-768-1001 FAX 856-778-1144 Sheet Number: 2 of 2

Date of Testing: 7/21/2015

EEI Representative: J. Polo

Compiled by: J. Polo

Project Name: NJANG Fuel Cell / Corrosion Control Hangar

Project Number: 27933.J0 l

Texture Structure Consistence Remarks

10YR7/8 Yellowish

Brown Loose

Depth

(ft.)

Boundary Matrix Color Redox Mottles Mottle Color

Total Depth: 12.5 Additional Notes: Infiltration test depth at 5.0'.

Equipment Used: Back-hoe Initial Water Depth: Time:

Excavating Company: Advantage Sitework Subsequent Water Depth: Time:

Soil Description Log

Test Pit Location: TP-2 Ground Cover / Land Use: Grass covered

Surface Elevation: ± 50.5' Limiting Zone: Fine grain soils to 13.5', Mottled soil 12.0' to 13.5'

30 min. 60 min.

DRI-1A 52.0 7.5 6.00 6.00 5.00 5.00 5.00 5.00

DRI-1B 52.0 7.5 6.00 6.00 5.00 5.00 5.00 5.00

30 min. 60 min.

Indicates the final reading that was used to determine the infiltration rate at the corresponding location.

PHONE 856-768-1001 FAX 856-768-1144 J. Ward

6/24/15

J. Polo

Drawn/ Compiled by:

403 Commerce Lane West Berlin, NJ 08091 EEI Representative:

Date of Testing:

Project Number:

Project Name:

27933.J0

Test

Hole

Number 90 min

Drop in Water at Time (in.)

Presoak Period (in.)

60 min

DRAFT INFILTRATION TESTING LOG

Drop in Water during Drop in Water at Time (in.)

60.00

20 min

60.00

Table IA - Double Ring Infiltrometer Test Results

Test

Hole

Number

*Infiltration

Depth

(ft.)

Inches/Hour

Infiltration RateSurface

Elevation

(ft.)

*Infiltration

Depth

(ft.)

* Infiltration depths were measured from existing site grades at the time of the investigation.

Drop in Water during Infiltration RateSurface

Elevation

(ft.)

120 min30 min

8/4/15

NJANG Fuel Cell and Corrossion Control Hangar

Presoak Period (in.)

15 min5 min 10 min

Date Compiled:

Inches/Hour

30 min. 60 min.

DRI-2A 50.5 5.0 0.250 0.250 0.250 0.125 0.125 0.125

DRI-2B 50.5 5.0 0.250 0.250 0.250 0.125 0.125 0.125

30 min. 60 min.

Indicates the final reading that was used to determine the infiltration rate at the corresponding location.

PHONE 856-768-1001 FAX 856-768-1144 Drawn/ Compiled by: J. Ward

Date Compiled: 8/4/15

Project Number: 27933.J0

Date of Testing: 7/21/15

403 Commerce Lane West Berlin, NJ 08091 EEI Representative: J. Polo

DRAFT INFILTRATION TESTING LOG

Project Name: NJANG Fuel Cell and Corrossion Control Hangar

Inches/Hour

Infiltration Rate

Presoak Period (in.)

30 min 60 min 90 min 120 min

* Infiltration depths were measured from existing site grades at the time of the investigation.

Test

Hole

Number

Surface

Elevation

(ft.)

*Infiltration

Depth

(ft.)

Drop in Water during Drop in Water at Time (in.)

Inches/Hour

0.25

0.25

10 min 15 min 20 min

Table IA - Double Ring Infiltrometer Test Results

Test

Hole

Number

Surface

Elevation

(ft.)

*Infiltration

Depth

(ft.)

Drop in Water during Drop in Water at Time (in.) Infiltration Rate

Presoak Period (in.)

5 min

1381141159N Line

1381141159N Typewritten Text

ITERMANTIC #K122