18067_Wurst Property_VIMR_20180529

Mid Atlantic
Engineering & Environmental Solutions
May 29, 2018
Ms. Sharon Eckard, PG
Eastern District Supervisor
Division of Waste Management -Brownfield Program
NC Department of Environmental Quality
217 W. Jones Street
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Subject: VIMS EXTRACTION POINT RELOCATION REPORT
FORMER WURST FACILITY
810 LUFKIN ROAD
APEX, NORTH CAROLINA
BROWNFIELDS PROJECT NO. 18067-14-092
Dear Ms. Eckard:
409 Rogers View Court
Raleigh, NC 27610
office 9:9,250.9918
facsimile 99,250.9950
MAAONLINE.COM
On March 1, 2018 Jim Knoles of Spec Con informed the Brownfield Program of plans to modify the
location of four extraction points associated with the Vapor Intrusion Mitigation System (VIMS) in
operation at 810 Lufkin Road, Apex, North Carolina (former Wurst facility). These relocations were
required to prepare the building for a new occupant. The new occupant is a concrete contractor
that will use the space for offices and warehousing. The following is a summary of the planned
relocations. The location of the extraction points are illustrated on the attached Drawing.
• R-1 moved approximately 12" to the north and 7" to the east
• R-2 moved approximately 3" to the north and 28" to the east
• R-3 moved approximately 36" to the south
• R-5 moved approximately 8" to the east
On March 28, 2018, prior to the relocation of the extraction points, Mid -Atlantic collected one round
of readings at each sub -slab monitoring point (see attached Table). PRM, the remediation
contractor that constructed the VIMS, subsequently conducted the extraction point relocation. On
May 18, 2018 Mid -Atlantic returned to the subject site to collect a post extraction point relocation
set of data. These data are also included in the Table. When these data were collected, there were
openings in the concrete floor in close proximity to monitoring points RM-2 and RM-4. These
openings, temporarily cut into the floor for the placement of electrical utilities, significantly reduced
the readings at RM-2 and RM-4. On May 23, 2018, after the openings in the floor had been closed
with new concrete, Mid -Atlantic collected new readings from monitoring points RM-2 and RM-4
(see attached Table).
EXPERIENCED CUSTOMEFt FOCUSED INNOVATIVE

VIMS Extraction Point Relocation Report
Former Wurst Facility
810 Lufkin Road, Apex, North Carolina
May 29, 2018
Page 2
These data show the VIMS met the depressurization objective of 4 Pascal pressure differential
before and after the extraction point relocation. These data indicate that no adverse impacts on the
performance of the VIMS occurred as a result of the extraction point relocation.
We appreciate the opportunity to submit this report. If you have any questions, please let me know.
Sincerely,
Attachments Drawing
Table
CC: Mr. Doug Watson — Spec Con
Mid Atlantic
Engineering & Environmental Solutions

111 RA►JI I ki [r7
Mid Atlantic
Engineering & Environmental Solutions

2A
1983 OFFICE ADDITION
1983 PLANT ADDITION
■Approximate Location
of VIMS Riser
Approximate Location of
Footers for Columns
Approximate Location of
Monitoring Probe
6" PVC
4" PVC
2" PVC
NOTES:
1. Each riser is connected with metal piping from ground
surface to approximately 8' above ground to the PVC
VIMS piping network
Mid Atlantic
Engineering & Environmental Solutions

TABLE
Mid Atlantic
Engineering & Environmental Solutions

VACUUM READINGS AT MONITORING POINTS
WURST PROPERTY
810 LUFKIN ROAD
APEX NORTH CAROLINA
MAA JOB NO: R2482.04
Location:
OFFICE
PLANT
Blower Operating Parameters
Monitoring Point:
RM-1
RM-2
RM-3
RM-4
RM-5
PM-1
PM-2
PM-3**
PM-4
PM-5
PM-6
Date
Vacuum at Monitoring Point (Pascals)
Inches of WC
Hertz
Hours
3/28/2018
6.9
9.6
15.5
24.3
10.6
46.7
9.2
27.6
23.4
60.0
13.1
13.5
46.3
16,771.50
5/18 & 23/2018'
10.9
3.7/11.3
13.9
0.1/11.0
8.1
131.8
32.7
114.4
60.5
112.5
41.1
14
46.1
17,992.90
"wc = inches of water column (recorded from magnahelix inside cabinet)
Hours = Operating Hours
+Open cuts in concrete caused inaccurate readings; new readings collected after cuts were filled