RA-1724_10568_CA_LTRRPT_20230915

1044 Washington Street
Raleigh, NC 27605
[phone]
www.CatlinUSA.com
Wilmington, NC | Raleigh, NC | Washington, NC | Atlanta, GA
ENVIRONMENTAL | CIVIL | GEOTECHNICAL

Wilmington, NC | Raleigh, NC | Washington, NC | Atlanta, GA | Charleston, SC
September 15, 2023
North Carolina Department of Environmental Quality Division of Waste Management UST Section Attn: Ms. Linda Blalock1646 Mail Service Center Raleigh, NC 27699-1646
Re: Letter Report – Sorbent Sock Maintenance Scott & Roberts 733 Foster Street Durham, NC 27705 Incident Number: 10568 Risk Classification: I55D
CATLIN Project No. 221168
Dear Ms. Blalock,
CATLIN Engineers and Scientists (CATLIN) is pleased to provide you with this letter report documenting field activities performed in general accordance with CATLIN proposal number 221168.04P, prepared March 14, 2023. Services were authorized by the North Carolina Environmental Quality (NCDEQ) Task Authorization (TA) #04, accepted March 15, 2023, and Contract Number N122019D. The approved scope of services for this Task Authorization included:
•Maintain a sorbent sock in monitoring well MW-1RS, MW-13S, and MW-5, replacing thesocks on a monthly basis for up to six months (between March 2023 and August 2023);
•Check for light non-aqueous phase liquid (LNAPL; aka free product) during each monthlyreplacement;
•If LNAPL is encountered, bail the LNAPL into the 55-gallon drum stored on-site; and
•Prepare a letter report documenting the findings.
The Scott & Roberts site is located at 733 Foster Street, Durham, Durham County, North Carolina
(See Figures in Attachment A). CATLIN conducted field activities on March 30, April 26, May 24, June 28, July 26, and August 30, 2023 in accordance with the approved TA. Potential hazards were evaluated before beginning field work and their discussion is documented on Daily Activities Logs, provided in Attachment B. Site photographs are provided in Attachment C.
NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists
CATLIN Project No. 221168 September 2023
September 15, 2023 Page 2 of 3
Sorbent Sock Maintenance
During this reporting period, CATLIN replaced the sorbent socks in monitoring wells MW-1RS, MW-13S, and MW-5 on in March, April, May, June, July, and August 2023. During each site visit, small amounts of LNAPL were observed in the sorbent socks. The socks were removed from the
wells and wrung out in the 55-gallon drum, which is stored on-site. New sorbent socks were installed in the wells during each site visit.
Gauging Activities
Following the removal of the sorbent sock, CATLIN personnel measured depth to water and depth to product in monitoring wells MW-1RS, MW-13S, and MW-5 using an electronic water/oil interface probe. Gauging procedures were performed in general accordance with NCDEQ Guidelines and Environmental Protection Agency (EPA) Region 4 Operating Procedures. Gauging results and presented on the following table:
Date Water Level Measured (mm/dd/yy)
MW-1RS MW-13S MW-5
DTW
(feet)
LNAPL Thickness (feet)
DTW
(feet)
LNAPL Thickness (feet)
DTW
(feet)
LNAPL Thickness (feet)
03/30/23 14.32 0.01 14.11 0.03 9.85 0.02 04/26/23 14.51 NMT 14.24 NMT 10.19 NMT 05/24/23 14.86 NMT 14.49 NMT 10.15 NMT 06/28/23 14.77 NMT 14.56 NMT 9.94 NMT 07/26/23 15.00 NMT 14.70 NMT 10.26 NMT 08/30/23 15.19 NMT 15.16 NMT 10.69 NMT
DTW = Depth to Water (from Top of Casing) NMT = No Measurable Thickness
LNAPL Recovery
As mentioned above, LNAPL was removed as part of the sorbent sock replacement. Following
gauging activities, if the well appeared to be impacted by LNAPL, the impacted groundwater was hand-bailed and stored in the 55-gallon drum. Below is a table summarizing the LNAPL recovery during this reporting period:
Date of Recovery (mm/dd/yy)
MW-1RS MW-13S MW-5
Liquid Removed (gallons)
LNAPL Removed (gallons)
Liquid Removed (gallons)
LNAPL Removed (gallons)
Liquid Removed (gallons)
LNAPL Removed (gallons)
03/30/23 0.75 0.06 0.75 0.09 0.75 0.05
04/26/23 0.5 None 0.5 None 0.5 None
05/24/23 None None None None None None
06/28/23 None None None None None None
07/26/23 None None None None None None
08/30/23 None None None None None None
Gallons removed are approximate.
September 15, 2023
Page 3 of 3
NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists
CATLIN Project No. 221168 September 2023
Recommendations

CATLIN recommends removing the sorbent socks from MW-1RS, MW-13S, and MW-5 and
conducting a groundwater sampling event approximately four weeks after sock removal.

CATLIN Engineers and Scientists will proceed upon notification of your approval. Should you
have any questions or require additional information, please contact us at [phone].

Sincerely,

Sean O’Neil, PE
Project Manager

Attachments:
A Figures
B Daily Activities Logs
C Site Photographs

NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists
CATLIN Project No. 221168 September 2023
ATTACHMENT A
FIGURES
1 ,500FEETRADIUS
INTERSTATE 85
SITE LOCATION
FOSTER STTRINITY AVEDURHAM FWY
Copyright:© 2013 National Geographic Society, i-cubed
FIGUREPROJECTTITLE
1SCOTT & ROBERTS
733 FOSTER STDURHAM, NC SITE VICINITY MAP
2,000 0 2,000 4,0001,000
Feet
INCIDENT NO.JOB NO.DATE SCALE DRAWN BY/CHECKED BY10568221168SEP 2023 AS SHOWN KMC/SJO
³
!>!>
!>
!>!>
!(>
!>
!>!>!>
!>
!>!>
!>!>
!>
!>
!>!(>
!>
!>
!>
!>
!>
!(>!>!(>FOSTER STTRINITY AVE
MW-14
MW-15
MW-TM-23
MW-8
MW-3
MW-TM-4MW-TM-1
MW-6 MW-9
MW-10
MW-11
MW-7
MW-TM-3
MW-12
MW-TM-2
MW-TM-21MW-5
MW-TM-22
MW-2MW-13S/D
MW-1RS/D/PMW-1
MW-4
MW-TM-20
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
FIGUREPROJECTTITLE
2ASCOTT & ROBERTS
733 FOSTER STDURHAM, NC SITE MAP
100 0 100 20050
Feet
INCIDENT NO.JOB NO.DATE SCALE DRAWN BY/CHECKED BY10568221168SEP 2023 AS SHOWN KMC/SJO
NOTE: Well locations were obtained from previous reports prepared by other consultants and are approximate.
Parcel Boundary
LEGEND
Monitoring Well
(Type II)!>
Abandoned Monitoring Well (Type II)!>Monitoring Well
(Deep)!(>
³
!>!>
!>
!>
!>
!(>
!>
!>
!>
!>
!>
!>!>!>!>!>!>
!>!(>
!>
!>!>!>!>
!(>!>
!(>FOSTER STMW-4
MW-2
MW-13DMW-13S
MW-1 MW-1RD/S/P6,600-GAL. MINERALSPIRIT UST
1,000-GAL.DIESEL UST 550-GAL. STODDARDSOLVENT USTS
560-GAL.GASOLINE UST
MW-TM-22
MW-5
MW-TM-21
MW-3
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
FIGUREPROJECTTITLE
2BSCOTT & ROBERTS733 FOSTER ST
DURHAM, NC
SITE MAP
30 0 30 6015
Feet
INCIDENT NO.JOB NO.DATE SCALE DRAWN BY/CHECKED BY10568221168SEP 2023 AS SHOWN KMC/SJO
NOTE: Well and tank locations were obtained from previous
reports prepared by other consultants and are approximate.
Parcel Boundary
Approximate Location
of Former USTs
LEGEND
Monitoring Well
(Type II)!>
Abandoned Monitoring Well (Type II)!>Monitoring Well
(Deep)!(>
³

NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists
CATLIN Project No. 221168 September 2023

ATTACHMENT B DAILY ACTIVITIES LOGS
Page __ of __
CATLIN DAILY ACTIVITIES LOG
CATLIN
PROJECT:
Engineers and Scientists
Kelly's Grocery
CATLIN PROJECT#: 221050 REPORT BY:
CLIENT'S NAME: NCDEQ • SLP CATLIN ._S_U_B_C_O_N_T_RA_C_T_O_R_S_: ________________ ---1CREW:
TIME
VEHICLE#:
EQUIPMENT USED EQUIPMENT
0 .0 . Meter YSI
Generator Redi-Flo Pump
Slug Test Equipment Geopump
pHrremp. Meter Conductivity Pen
PID/FID Meter Water Level Indicator
START
ODOMETER:
USED
ACTIVITY
EQUIPMENT
GPS Unit
Bailers
Sampling Supplies
Tubing
PPE Level C or D
END
ODOMETER:
USED OTHER EQUIP. USED
Approval of data for final report can only be made by CATLIN Engineers and Scientists and cannot be conveyed on this form.
This is a field copy and is subject to review and revision.

NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists
CATLIN Project No. 221168 September 2023

ATTACHMENT C SITE PHOTOGRAPHS
ATTACHMENT C SITE PHOTOGRAPHS
NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists CATLIN Project No. 221168 September 2023

View of MW-1RS, facing north.

View of MW-13S, facing north.
ATTACHMENT C SITE PHOTOGRAPHS
NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists CATLIN Project No. 221168 September 2023

View of bailer with groundwater and LNAPL from MW-13S.
View of MW-5, facing northwest.
ATTACHMENT C SITE PHOTOGRAPHS
NCDEQ; 10568_Scott & Roberts CATLIN Engineers and Scientists CATLIN Project No. 221168 September 2023

View of MW-5, facing east.