2022-08_04_DGA_Block_C_FINAL

Mid Atlantic
Engineering & Environmental Solutions
August 4, 2022
Mr. Robert Steward
Seaboard Station Joint Venture LP, LLC
760 Maine Avenue SW
Washington, District of Columbia 20024
Subject: DATA GAP ASSESSMENT REPORT
SEABOARD STATION BLOCK C REDEVELOPMENT
10 WEST FRANKLIN STREET
RALEIGH, WAKE COUNTY, NORTH CAROLINA
MID -ATLANTIC JOB NO. R3746.03
Dear Mr. Steward:
409 Rogers View CourC
Raleigh, NC 276 10
office 919.250,9918
facsimile 919.250.9950
MAAONLINE.COM
We are pleased to present this Data Gap Assessment Report for the above -referenced
site. We appreciate the opportunity to provide environmental services to Seaboard Station
Joint Venture LP, LLC. Please contact me at 919-250-9918 if any questions arise or if we
may be of further service.
Sincerely,
MID -ATLANTIC ASSOCIATES, INC.
Kevin R. Clay, PG
Project Geologist
Enclosure
EXPERIENCE❑ CUSTOMER FOCUSED INNOVATIVE

DATA GAP ASSESSMENT REPORT
SEABOARD STATION BLOCK C REDEVELOPMENT
10 WEST FRANKLIN STREET
RALEIGH, WAKE COUNTY, NORTH CAROLINA
BROWNFIELDS PROJECT NUMBER 22075-18-092
MID -ATLANTIC PE LICENSE: F-0967
MID -ATLANTIC JOB NUMBER: R3746.03
REVISION: 0
Prospective Developer:
Seaboard Station Joint Venture LP, LLC
Robert Steward
760 Maine Avenue SW
Washington, District of Columbia 20024
Phone: [phone]
Email: rsteward(a)-hoffman-dev.com
Consultant:
Mid -Atlantic Associates, Inc.
Kevin R. Clay, PG
409 Rogers View Court
Raleigh, North Carolina, 27610
Phone: [phone]
Email: kclay(a�maaonline.com
Brownfields Project Manager:
Brad Atkinson
Mail Service Center 1646
Raleigh, North Carolina, 27699
Phone: [phone]
Email: brad. atkinson(a�ncdenr.gov
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TABLE OF CONTENTS
1.0 GENERAL INFORMATION............................................................................................... 1
1.1 Introduction.................................................................................................................... 1
1.2 Laboratories................................................................................................................... 2
2.0 SUMMARY OF FIELD ACTIVITIES.................................................................................. 2
2.1 Soil Sampling and Screening Activities........................................................................... 2
2.2 Soil Gas Sampling Activities........................................................................................... 3
2.2.1 Vapor Implant Installation Procedures...................................................................... 3
2.2.2 Vapor Pin Installation Procedures............................................................................. 4
2.2.3 Helium Leak Check and Purging Procedures........................................................... 4
2.2.4 Sample Collection Procedures................................................................................. 5
3.0 SUMMARY OF LABORATORY ANALYTICAL RESULTS ............................................... 5
3.1 Soil Sample Results....................................................................................................... 5
3.2 Soil Gas Sample Results................................................................................................ 5
3.2.1 Risk Evaluation Methodology and Results................................................................ 6
3.3 Summary and Discussion............................................................................................... 7
4.0 QUALITY ASSURANCE................................................................................................... 7
5.0 INVESTIGATION DERIVED WASTE................................................................................ 7
6.0 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS ............................................. 7
FIGURES
Figure 1
Topographic Site Map
Figure 2
Proposed Redevelopment Map
Figure 3a
Beneficial Fill Sample Location Map
Figure 3b
Soil Gas Sample Location Map
TABLES
Table 1
Property Summary
Table 2a
Beneficial Fill Sampling Summary
Table 2b
Soil Gas Sampling Summary
Table 3
Summary of Chemical Constituents Detected in Soil and Risk Calculations
Table 4
Constituents Analyzed in Soil Gas and Risk Calculations
1% Mid Atlantic