RA-2181_13379_CA_LTTRPT_20231003_RDC_Report

WithersRavenel
Our People. Your Success. 

115 MacKenan Drive | Cary, NC 27511 
t: 919.469.3340 | f: 919.467.6008 | www.withersravenel.com | License No. F‐1479 
Asheville | Cary | Charlotte | Greensboro | Lumberton | Pittsboro | Raleigh | Southern Pines | Wilmington

October 3, 2023 

State of North Carolina 
Department of Environmental Quality 
Federal & State Lead Program 
Division of Waste Management‐Underground Storage Tank Section 
1646 Mail Service Center 
Raleigh, North Carolina 27699‐1646 

Attn: Mr. Mark Petermann 

Reference:   Letter Report – Remedial Design Characterization 
Arvin Oil Company 
5837 & 5839 Fayetteville Road (US Hwy. 401)  
Raleigh, Wake County, North Carolina 
Groundwater Incident Number: 13379 
UST Number: RA‐2181 
NCDEQ Contract # N70522‐C 
WR Project Number:  23‐0307‐N 

Mr. Petermann: 

WithersRavenel, Inc. (WR) has prepared this Letter Report documenting the completion of a 
Remedial Design Characterization (RDC) at the referenced site in Raleigh, Wake County, North 
Carolina.  Activities outlined herein were completed under NCDEQ Contract # N70522‐C, Task 
Authorization (TA) 02 for the site, issued by NCDEQ on April 28, 2023.  WR Requested an 
extension to the due date for this TA awaiting receipt of ASTs completed RDC, and the due date 
was extended to October 20, 2023.  WR Did not receive ASTs report until September 29, 2023.   

Remedial Design Characterization – June 2023 

On June 16, 2023, WR personnel, along with AST Environmental, Inc. (AST) and South Atlantic 
Environmental Drilling and Construction Co. Inc. (SAEDACCO) mobilized to the site and completed 
a remedial design characterization focused on determining the optimal future use of BOS200® 
activated carbon as a remedial treatment for groundwater contamination related to the site.   
The RDC included the installation and sampling of a total of 2 soil borings (RDC‐01 & RDC‐02), 
extending from surface grade to terminal depths between 32‐ and 33‐ft beneath surface grade.  
Characterization also included the collection of groundwater samples through a screen point 
sampler at discreet depths within borings.  Existing monitoring wells MW‐3R, MW‐4, MW‐8 and 
MW‐8R were also developed and sampled.  Soil and groundwater samples collected in association 
with the RDC were submitted by AST for laboratory analysis by the RPI Project Support Laboratory 
in Golden, CO.     

Findings of the RDC and recommendations based on those findings are discussed in ASTs report, 
a copy of which is attached.     
WithersRavenel
Our People. Your Success. 

Arvin Oil Company – Incident # 13379 WR Project # 23‐0307‐N 
Letter Report – Remedial Design Characterization  October 2023 
2 

ASTs Investigation mapped contaminant concentrations in soil and groundwater at depth showing 
the extents of the petroleum contaminant plume.  Based on their characterization, AST generated 
a remedial plan utilizing their BOS 200 injectable treatment product.  The treatment plan consists 
of a treatment area generally centered on monitoring well MW‐3R and ASTs pricing associated 
with the treatment area are show below: 

Treatment Area (See attached AST Report) Estimated Injection 
Cost 
Area A $61,890 

Locations and extents of the proposed treatment area as well as treatment volume calculations 
are shown in the attached AST RDC report. 

As AST was unable to complete the originally proposed RDC in a single day, WR attempted to 
obtain authorization (both via phone and in‐person) from the site owner’s son (Michael Arvin) to 
complete the additional borings initially proposed.  Mr. Arvin flatly denied further access to the 
property and stated that no access would be considered unless the NCDEQ Incident Manager (Mr. 
Mark Petermann) personally came to the site to discuss the matter.  According to Mr. Petermann 
he contacted Mr. Michael Arvin by telephone on September 27, 2023, to discuss his concerns and 
arrange for a mutually acceptable meeting date. Mr. Arvin stated that a site meeting would not be 
necessary. Mr. Arvin further stated there would be no future access allowed to the property for 
any additional assessment, remediation or monitoring.  

WithersRavenel appreciates the opportunity to be of service to the Federal & State Lead Program. 
Should you have any questions regarding the attached, please do not hesitate to contact 
WithersRavenel at (919) 469‐3340. 

Cordially, 
WithersRavenel
  Kevin B. Buchanan G. Matthew James, P.G. 
Project Manager Director of Geosciences 

Enclosures: AST Environmental RDC Report, Site Photographs 

ATTACHMENT A 

AST Environmental RDC Report 

1567 CF Pours
Harrisonburg, VA 22802
www.astenvironmental.com

September 29, 2023

Mr. Kevin Buchanan
Withers Ravenel
115 Mackenan Dr.
Cary, NC 27511

RE: Quantitative High Resolution Site Characterization Report
Arvin Oil Co.
711 N Main Street
Wake Forest, North Carolina
Dear Mr. Buchanan,

AST Environmental, Inc. (AST) appreciates the opportunity to collaborate with Withers Ravenel
and NCDEQ to complete the Quantitative High Resolution Site Characterization (qHRSC) at the
above referenced location. The proposed scope of work was to complete 4 soil borings to
approximately 45 ft-bgs. The overall goal of this qHRSC program is to:

1. Quantify the TVPH and benzene soil concentrations, on site and off.
2. Provide a visual interpolation of a high-resolution data set to aid in future investigation and
remedial activities.
3. Design a BOS 200+ injection plan to bring groundwater concentrations in compliance with
regulatory requirements.

This letter report provides a summary of field activities during the RDC and an overview of
analytical soil and groundwater data.

REMEDIAL DESIGN CHARACTERIZATION

On June 16, 2023 AST mobilized to the site to begin direct push drilling with the Geologic
Exploration (GEX) drilling team. The GEX crew arrived late to the site, causing only two of the
planned four borings being advanced. During the RDC event, a total of 2 soil borings were
advanced via direct push drilling by GEX using their Geoprobe 3230. At each boring location, a
2.25 inch diameter direct push, dual tube tooling was advanced in five foot runs. Samples were
collected every two feet beginning at PID or olfactory presence of hydrocarbon mass. All intervals
were logged for lithology and PID readings were collected to guide the sampling process. Soil
samples were collected and shipped to the RPI Project Support Laboratory in Golden, CO for
VOC and Total Volatile Petroleum Hydrocarbon (TVPH) analysis via EPA method 8260B. Soil
data has been tabulated and is included in the attachments as Table 1. Although this data is used
for injection design purposes, the lab is not a certified or accredited laboratory, this data should
not be used for regulator or compliance purposes.

Existing monitoring wells MW-03R, MW-04, MW-08, and MW-08R, along with temporary wells
set at RDC-01 (MW-04) and RDC-2 (MW-03R) were developed and sampled. Groundwater
samples were shipped to the RPI Project Support Laboratory in Golden, CO for VOC and Total
Volatile Petroleum Hydrocarbon (TVPH) analysis via EPA method 8260B, anions via EPA method
300.1 and dissolved gases via EPA method RSK 175. Groundwater data has been tabulated and
is included in the attachments as Table 2, Table 3, and Table 4.

Boring logs for each location are included in Attachment B.
Arvin Oil Co.
September 29, 2023
Page 2

Conclusions and Recommendations

As indicated above, the ITRC LNAPL Guidance Document states that TVPH concentrations
indicative of residual LNAPL in the subsurface are between 250 and 500 mg/kg, depending on
the soil type. Based on the data collected during the RDC event, the subsurface distribution of
residual LNAPL is minimal and confined to the area immediately surrounding and below the
former tank pit.

Groundwater in RDC-02 indicate benzene in concentrations greater than 5,000 ug/L, while RDC-
01, MW-03R, MW-04, and MW-08 show concentrations above 1 ug/L.

Based on the data generated during this qHRSC, AST recommends that a BOS 200+ injection
program be considered to reach the groundwater goal of 2L at this site.

Based on the GCL remediation goal of 5,000 ug/L benzene, and the elevated soil mass present
in the injection area, a BOS 200+ plan has been completed that includes supplemental additives
to increase the rate of degradation on the activated carbon surface and prolong the ability of the
facultative microbes to continue the degradation process for years.

BOS 200+ INJECTION DESIGN – SEE ATTACHED FOR DESIGN LOADINGS & FIGURE FOR
LOCATIONS
BOS 200® provides the unique capability (Trap & Treat® process) to utilize two proven and
powerful technologies that rapidly and effectively remediate petroleum hydrocarbon sites:

1) Trapping of the contaminants via activated carbon adsorption.
2) Subsequent treatment via biological degradation within the BOS 200® matrix utilizing both
aerobic and anaerobic microbial processes.

The “Trap” provides the immediate mass reduction and plume control, while the “Treat” provides
the continued long-term remedial degradation using synergistic facultative bacteria. No other
activated carbon product can emplace a biological treatment mechanism on activated carbon for
injection; this intellectual property is protected by RPI patents. AST is designed by RPI as the
product design arm and distributor for the RPI Group.

BOS 200® is a fine-grained, dry material which consists of activated carbon, calcium sulfate,
nitrate, phosphate, and ammonia in a proprietary blend. It is 77% by weight activated carbon and
up to 19% gypsum. The gypsum component itself is 79% by weight sulfate, which translates to
approximately 15% by weight sulfate in BOS 200®. The product is mixed with water and a
facultative blend of aerobic and anaerobic microbes to create a solids suspension. This is now an
ideal environment for biological degradation, where hydrocarbons are adsorbed on to BOS 200®
particles made up of:
• Terminal Electron Acceptors: oxygen, nitrate, ammonia, and sulfate (primary)
• Micro- and Macro-Nutrients - phosphorus and nitrogen
• Aerobic and anaerobic blend of facultative microbes (over 27 species)
On flexibility, with BOS 200® product, the design approach can vary from a treatment objective
where complete and immediate contaminant mass removal from the groundwater is achieved, to
a partial contaminant mass reduction working in conjunction with biological degradation driving
the groundwater cleanup effort, or any combination somewhere in between. The end effect is that
the plume can be controlled in a short period of time and treatment can be extended over a longer
period.

The BOS 200® injection design has been prepared for each area using the following
approach/basis:

1. RDC and historical data from soil and groundwater sampling (i.e., analytical results, the
Arvin Oil Co.
September 29, 2023
Page 3

screened interval of the wells, the soil sampling depth intervals) were used to determine
the vertical and horizontal extent of impacts in each area.

2. Using the same data for each area a contaminant mass loading on a unit basis (lb.
benzene per ft3 of impacted media) was determined for each of the designated areas.

3. The contaminant mass loadings were then used to determine the BOS 200® loadings (lbs.
installed per ft3 of impacted media) necessary to remediate a specific depth interval within
each injection area. This is a balance between the need to have an immediate mass
reduction or to allow the biological process to be the controlling process. This is
specifically discussed for each area below.

4. Quarterly monitoring of the dissolved phase contaminant trends (BTEX, TVPH), along
with terminal electron acceptor consumption will dictate if/when a second additional
event occurs.

POST INJECTION SAMPLING

Following the injection, AST will collect groundwater samples from all of the monitoring wells
within the injection area prior to demobilizing. AST recommends performance progress
groundwater sampling events at intervals of one week, two weeks, one-month post injection and
quarterly until remediation goals are obtained. AST understands that this will be performed by
others. The performance samples can be sent to Remediation Products, Ince. Laboratory in
Golden, CO for no cost of analyses. The cost of shipment will be the responsibility of the
consultant. The analyses will be consistent with that described previously.

If you have any questions or wish to discuss the information provided herein, please contact me
at [phone] or via email at [e-mail].

Sincerely,
AST Environmental, Inc.

Nathan Thacker
Senior Geologist

Figures

CROWN FLOORING LLC(FORMER GAS STATION)FORMERUSTAREACONCRE
T
E

S
L
A
BMW-2RMW-10MW-7MW-6RMW-3RMWD-7MW-1MWD-9MWD-6WSW-2RESIDENCERESIDENCERESIDENCEFAYETTEVILLE ROAD(HIGHWAY 401)GARAGE/STORAGEBUILDINGWOODENSHEDMWD-14MWD-15MW-11MW-12MWD-13MW-16MW-17MWD-17MW-8MW-4MWD-5FORMER HYDRAULICLIFT AREAESTIMATED EXTENT OF BENZENE ATCONCENTRATIONS EXCEEDING 2LSTANDARD - SURFICIAL AQUIFER1.01.0(<0.5)(0.893)(1,540)(10.9)(<0.5)(<0.5)(5,020)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)LEGEND WATER SUPPLY WELL TYPE II MONITORING WELL BENZENE CONCENTRATION ESTIMATED EXTENT OF GROUNDWATER BENZENE CONTAMINATION AT LEVELS EXCEEDING NC 2L STANDARD (1.0 ug/L)NOTES: 1.) 2021 AERIAL OBTAINED FROM NC ONE MAP. 2.) ALL DATA SHOWN IN ug/L. 3.) VALUES SHOWN IN RED EXCEED NC GCL FOR BENZENE.(1,540)GROUNDWATER BENZENEISOCONCENTRATION MAP
MARCH 2023
DRAWN BY:
5
SCALE:FIGURE NO.:
PROJECT NO.:DATE:APPROVED BY:
ARVIN OIL COMPANYTF#13379
5837 & 5839 FAYETTEVILLE ROAD (US HIGHWAY 401)RALEIGH, WAKE COUNTY, NC
WithersRavenel
Engineers | Planners | Surveyors
115 MacKenan Drive | Cary, NC 27511 | t: 919.469.3340 | license #: F-1479 | www.withersravenel.com
1"=30 'GRAPHIC SCALE1 inch = 30 ft.0301560KBB
MJ 04/05/2023 23-0307-N

Tables

Table 1 Soil Analytical Results
mg/Kg
Dimethyl SulfideMTBE1,2-DichloroethaneBenzeneTolueneEthylbenzenem/p-Xyleneo-XyleneTotal Xylene1,2,4-TrimethylbenzeneNaphthaleneTVPHRDC-01 6/8/2023 11 0 <0.5 <0.5 <0.5 <0.5 2.1 0.7 3.3 1.7 5 3.2 <0.5 <0.5
RDC-01 6/8/2023 13 0 <0.5 <0.5 <0.5 <0.5 1.1 <0.5 2.3 1 3.3 3.6 <0.5 <0.5
RDC-01 6/8/2023 15 0 <0.5 <0.5 <0.5 <0.5 1.3 <0.5 2.1 0.9 3 1.5 <0.5 <0.5
RDC-01 6/8/2023 17 0 <0.5 <0.5 <0.5 <0.5 1.2 <0.5 2 0.9 2.9 1.6 <0.5 <0.5
RDC-01 6/8/2023 19 0 <0.5 <0.5 <0.5 <0.5 1.3 <0.5 2.1 0.9 3 1.7 <0.5 <0.5
RDC-01 6/8/2023 21 0 <0.5 <0.5 <0.5 1.9 14 3 14 6.1 20.1 5.4 <0.5 <0.5
RDC-01 6/8/2023 23 0 <0.5 <0.5 <0.5 <0.5 1 <0.5 1.2 0.7 1.9 1.3 <0.5 <0.5
RDC-01 6/8/2023 25 0 <0.5 <0.5 <0.5 3.2 19 4.1 44 23 67 40 8.7 2.4
RDC-01 6/8/2023 27.5 118.2 <10 <10 <10 130 2900 2200 11200 4700 15900 14600 1700 250
RDC-01 6/8/2023 29 98.9 <10 <10 <10 170 2100 710 3100 1300 4400 3600 420 44
RDC-01 6/8/2023 31 594.6 <50 <50 <50 440 11400 6700 26300 10400 36700 22600 2900 340
RDC-01 6/8/2023 32 118.7 <10 <10 <10 530 4900 800 2900 1400 4300 1100 210 24
RDC-02 6/8/2023 11 0 <0.5 23 <0.5 <0.5 3.8 1.1 5.3 2.6 7.9 6.3 3.5 <0.5
RDC-02 6/8/2023 13 0 <0.5 25 <0.5 <0.5 2.6 1 4.8 2.2 7 6 2.8 <0.5
RDC-02 6/8/2023 15 0 <0.5 52 <0.5 <0.5 1.9 0.6 3 1.4 4.4 3.4 1.4 <0.5
RDC-02 6/8/2023 17 0 <0.5 66 <0.5 <0.5 2.2 0.8 4.1 2.1 6.2 4.5 <0.5 <0.5
RDC-02 6/8/2023 19 0 <0.5 140 <0.5 <0.5 1.8 0.6 3 1.2 4.2 3 0.9 0.6
RDC-02 6/8/2023 21 0 <0.5 200 4.2 <0.5 2.2 0.6 2.9 1.4 4.3 2.5 1.4 0.7
RDC-02 6/8/2023 23 0 <0.5 150 <0.5 <0.5 1.9 <0.5 2.2 1 3.2 2.1 <0.5 0.8
RDC-02 6/8/2023 25 8 <10 110 <10 <10 24 <10 25 29 54 43 19 <10
RDC-02 6/8/2023 27 39.3 <10 130 <10 160 1600 330 1600 960 2560 750 150 18
RDC-02 6/8/2023 29 242 <10 51 <10 330 3700 1000 4200 2000 6200 2500 350 41
RDC-02 6/8/2023 31 157 <10 <10 <10 660 4700 710 2700 1300 4000 1100 200 24
RDC-02 6/8/2023 33 122 <10 <10 <10 560 4000 470 1800 950 2750 540 110 15
Facility name: Withers - Arvin Oil
Table 1
Soil Analytical Results
Chemical of concern (ug/kg)
Sample
location
Sample
date
Sample
depth
(ft)
PID or
OVD
reading
(ppm)
Table 2 Water Analytical Results
Dimethyl SulfideMTBE1,2-DichloroethaneBenzeneTolueneEthylbenzenem/p-Xyleneo-XyleneTotal Xylene1,2,4-TrimethylbenzeneNaphthaleneTVPHMW-3R 6/8/2023 30 <0.5 71 <0.5 3900 20000 3200 11200 5800 17000 2500 690 74
MW-4 6/8/2023 30 <10 <10 <10 520 3700 700 2900 1400 4300 1400 880 23
MW-8 6/8/2023 30 <0.5 <0.5 <0.5 5.3 15 6.9 30 19 49 13 8.9 <0.5
MW-8R 6/8/2023 30 <0.5 1.9 <0.5 0.6 3.9 0.8 3.3 2 5.3 2.5 2.8 <0.5
RDC-01 6/8/2023 30 <5 13 <5 2200 12200 2900 8600 4500 13100 3000 960 78
RDC-02 6/8/2023 30 <0.5 <0.5 <0.5 5100 26400 4200 14100 7200 21300 3100 710 91
Facility name: Withers - Arvin Oil
Table 2
Water Analytical Results
Sample
location Sample date
Sample
Depth
Chemical of Concern (mg/L)

Attachment A
RPI Laboratory Analytical Data

Arvin Oil
Sample ID. No.RDC-01 RDC-01 RDC-01
Date Sampled 6/8/2023 6/8/2023 6/8/2023
Sample Depth 11 ft 13 ft 15 ft

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
MTBE ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
Benzene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
Toluene 2.1 0.5 ug/Kg 1.1 0.5 ug/Kg 1.3 0.5 ug/Kg
Ethylbenzene 0.7 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
m/p-Xylene 3.3 0.5 ug/Kg 2.3 0.5 ug/Kg 2.1 0.5 ug/Kg
o-Xylene 1.7 0.5 ug/Kg 1 0.5 ug/Kg 0.9 0.5 ug/Kg
1,2,4-Trimethylbenzene 3.2 0.5 ug/Kg 3.6 0.5 ug/Kg 1.5 0.5 ug/Kg
Naphthalene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
TVPH ND 0.5 mg/Kg ND 0.5 mg/Kg ND 0.5 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 70 86 80
d8-Toluene 97 99 97
p-Bromofluorobenzene 94 97 97
Arvin Oil
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
RDC-01 RDC-01
6/8/2023 6/8/2023
17 ft 19 ft
Reporting
Limit Units Flags
Reporting
Limit Units Flags
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
1.2 0.5 ug/Kg 1.3 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
2 0.5 ug/Kg 2.1 0.5 ug/Kg
0.9 0.5 ug/Kg 0.9 0.5 ug/Kg
1.6 0.5 ug/Kg 1.7 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 mg/Kg ND 0.5 mg/Kg
92 85
99 96
99 96
Arvin Oil
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
RDC-01 RDC-01
6/8/2023 6/8/2023
21 ft 23 ft
Reporting
Limit Units Flags
Reporting
Limit Units Flags
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
1.9 0.5 ug/Kg ND 0.5 ug/Kg
14 0.5 ug/Kg 1 0.5 ug/Kg
3 0.5 ug/Kg ND 0.5 ug/Kg
14 0.5 ug/Kg 1.2 0.5 ug/Kg
6.1 0.5 ug/Kg 0.7 0.5 ug/Kg
5.4 0.5 ug/Kg 1.3 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 mg/Kg ND 0.5 mg/Kg
112 96
100 97
99 96
Sample ID. No.RDC-01 RDC-01 RDC-01
Date Sampled 6/8/2023 6/8/2023 6/8/2023
Sample Depth 25 ft 27.5 ft 29 ft

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
MTBE ND 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
Benzene 3.2 0.5 ug/Kg 130 10 ug/Kg 170 10 ug/Kg
Toluene 19 0.5 ug/Kg 2900 10 ug/Kg 2100 10 ug/Kg
Ethylbenzene 4.1 0.5 ug/Kg 2200 10 ug/Kg 710 10 ug/Kg
m/p-Xylene 44 0.5 ug/Kg 11200 10 ug/Kg 3100 10 ug/Kg
o-Xylene 23 0.5 ug/Kg 4700 10 ug/Kg 1300 10 ug/Kg
1,2,4-Trimethylbenzene 40 0.5 ug/Kg 14600 10 ug/Kg E 3600 10 ug/Kg
Naphthalene 8.7 0.5 ug/Kg 1700 10 ug/Kg 420 10 ug/Kg
TVPH 2.4 0.5 mg/Kg 250 10 mg/Kg 44 10 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 91 101 101
d8-Toluene 102 104 103
p-Bromofluorobenzene 101 105 94
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
RDC-01 RDC-01
6/8/2023 6/8/2023
31 ft 32 ft
Reporting
Limit Units Flags
Reporting
Limit Units Flags
ND 50 ug/Kg ND 10 ug/Kg
ND 50 ug/Kg ND 10 ug/Kg
ND 50 ug/Kg ND 10 ug/Kg
440 50 ug/Kg 530 10 ug/Kg
11400 50 ug/Kg 4900 10 ug/Kg
6700 50 ug/Kg 800 10 ug/Kg
26300 50 ug/Kg 2900 10 ug/Kg
10400 50 ug/Kg 1400 10 ug/Kg
22600 50 ug/Kg 1100 10 ug/Kg
2900 50 ug/Kg 210 10 ug/Kg
340 50 mg/Kg 24 10 mg/Kg
99 102
103 102
102 96
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
Sample ID. No.RDC-02 RDC-02 RDC-02
Date Sampled 6/8/2023 6/8/2023 6/8/2023
Sample Depth 11 ft 13 ft 15 ft

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
MTBE 23 0.5 ug/Kg 25 0.5 ug/Kg 52 0.5 ug/Kg
1,2-Dichloroethane ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
Benzene ND 0.5 ug/Kg ND 0.5 ug/Kg ND 0.5 ug/Kg
Toluene 3.8 0.5 ug/Kg 2.6 0.5 ug/Kg 1.9 0.5 ug/Kg
Ethylbenzene 1.1 0.5 ug/Kg 1 0.5 ug/Kg 0.6 0.5 ug/Kg
m/p-Xylene 5.3 0.5 ug/Kg 4.8 0.5 ug/Kg 3 0.5 ug/Kg
o-Xylene 2.6 0.5 ug/Kg 2.2 0.5 ug/Kg 1.4 0.5 ug/Kg
1,2,4-Trimethylbenzene 6.3 0.5 ug/Kg 6 0.5 ug/Kg 3.4 0.5 ug/Kg
Naphthalene 3.5 0.5 ug/Kg 2.8 0.5 ug/Kg 1.4 0.5 ug/Kg
TVPH ND 0.5 mg/Kg ND 0.5 mg/Kg ND 0.5 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 74 66 73
d8-Toluene 99 97 97
p-Bromofluorobenzene 101 97 99
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
RDC-02 RDC-02
6/8/2023 6/8/2023
17 ft 19 ft
Reporting
Limit Units Flags
Reporting
Limit Units Flags
ND 0.5 ug/Kg ND 0.5 ug/Kg
66 0.5 ug/Kg 140 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
2.2 0.5 ug/Kg 1.8 0.5 ug/Kg
0.8 0.5 ug/Kg 0.6 0.5 ug/Kg
4.1 0.5 ug/Kg 3 0.5 ug/Kg
2.1 0.5 ug/Kg 1.2 0.5 ug/Kg
4.5 0.5 ug/Kg 3 0.5 ug/Kg
ND 0.5 ug/Kg 0.9 0.5 ug/Kg
ND 0.5 mg/Kg 0.6 0.5 mg/Kg
71 80
94 98
99 99
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
RDC-02 RDC-02
6/8/2023 6/8/2023
21 ft 23 ft
Reporting
Limit Units Flags
Reporting
Limit Units Flags
ND 0.5 ug/Kg ND 0.5 ug/Kg
200 0.5 ug/Kg 150 0.5 ug/Kg
4.2 0.5 ug/Kg ND 0.5 ug/Kg
ND 0.5 ug/Kg ND 0.5 ug/Kg
2.2 0.5 ug/Kg 1.9 0.5 ug/Kg
0.6 0.5 ug/Kg ND 0.5 ug/Kg
2.9 0.5 ug/Kg 2.2 0.5 ug/Kg
1.4 0.5 ug/Kg 1 0.5 ug/Kg
2.5 0.5 ug/Kg 2.1 0.5 ug/Kg
1.4 0.5 ug/Kg ND 0.5 ug/Kg
0.7 0.5 mg/Kg 0.8 0.5 mg/Kg
83 88
97 98
100 105
Sample ID. No.RDC-02 RDC-02 RDC-02
Date Sampled 6/8/2023 6/8/2023 6/8/2023
Sample Depth 25 ft 27 ft 29 ft

Reporting
Limit Units Flags
Reporting
Limit Units Flags
Reporting
Limit Units Flags
Dimethyl Sulfide ND 10 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
MTBE 110 10 ug/Kg 130 10 ug/Kg 51 10 ug/Kg
1,2-Dichloroethane ND 10 ug/Kg ND 10 ug/Kg ND 10 ug/Kg
Benzene ND 10 ug/Kg 160 10 ug/Kg 330 10 ug/Kg
Toluene 24 10 ug/Kg 1600 10 ug/Kg 3700 10 ug/Kg
Ethylbenzene ND 10 ug/Kg 330 10 ug/Kg 1000 10 ug/Kg
m/p-Xylene 25 10 ug/Kg 1600 10 ug/Kg 4200 10 ug/Kg
o-Xylene 29 10 ug/Kg 960 10 ug/Kg 2000 10 ug/Kg
1,2,4-Trimethylbenzene 43 10 ug/Kg 750 10 ug/Kg 2500 10 ug/Kg
Naphthalene 19 10 ug/Kg 150 10 ug/Kg 350 10 ug/Kg
TVPH ND 10 mg/Kg 18 10 mg/Kg 41 10 mg/Kg
% Surrogate Recovery
1,2-Dichloroethane-d4 103 101 98
d8-Toluene 100 102 102
p-Bromofluorobenzene 93 97 96
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
RDC-02 RDC-02
6/8/2023 6/8/2023
31 ft 33 ft
Reporting
Limit Units Flags
Reporting
Limit Units Flags
ND 10 ug/Kg ND 10 ug/Kg
ND 10 ug/Kg ND 10 ug/Kg
ND 10 ug/Kg ND 10 ug/Kg
660 10 ug/Kg 560 10 ug/Kg
4700 10 ug/Kg 4000 10 ug/Kg
710 10 ug/Kg 470 10 ug/Kg
2700 10 ug/Kg 1800 10 ug/Kg
1300 10 ug/Kg 950 10 ug/Kg
1100 10 ug/Kg 540 10 ug/Kg
200 10 ug/Kg 110 10 ug/Kg
24 10 mg/Kg 15 10 mg/Kg
100 100
101 103
97 96
Sample ID. No.
Date Sampled
Sample Depth

Dimethyl Sulfide
MTBE
1,2-Dichloroethane
Benzene
Toluene
Ethylbenzene
m/p-Xylene
o-Xylene
1,2,4-Trimethylbenzene
Naphthalene
TVPH
% Surrogate Recovery
1,2-Dichloroethane-d4
d8-Toluene
p-Bromofluorobenzene
Arvin Oil
Sample ID. No.MW-3R
Date Sampled 6/8/2023
Sample Depth 30 ft

Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/L
MTBE 71 0.5 ug/L
1,2-Dichloroethane ND 0.5 ug/L
Benzene 3900 25 ug/L
Toluene 20000 25 ug/L
Ethylbenzene 3200 25 ug/L
m/p-Xylene 11200 25 ug/L
o-Xylene 5800 25 ug/L
1,2,4-Trimethylbenzene 2500 25 ug/L
Naphthalene 690 25 ug/L
TVPH 74 25 mg/L
% Surrogate Recovery
1,2-Dichloroethane-d4 94
d8-Toluene 98
p-Bromofluorobenzene 95
Lactate ND 2 mg/L
Acetate ND 2 mg/L
Propionate ND 2 mg/L
Formate/Isobutyrate ND 2 mg/L
Butyrate ND 2 mg/L
Pyruvate ND 2 mg/L
Chloride 35 2 mg/L
Nitrite ND 2 mg/L
Succinate ND 10 mg/L
Nitrate ND 2 mg/L
Sulfate ND 2 mg/L
Phosphate NA 2 mg/L
Sulfide ND 2 mg/L
Methane ND 20 ug/L
Ethane ND 2 ug/L
Ethylene ND 2 ug/L
Propane ND 2 ug/L
Propylene ND 2 ug/L
Isobutane 2.4 2 ug/L
n-Butane 37 2 ug/L
Acetylene ND 2 ug/L
t-2-Butene ND 2 ug/L
1-Butene ND 2 ug/L
Isobutylene ND 2 ug/L
cis-2-Butene ND 2 ug/L
1,3-Butadiene ND 2 ug/L
Methyl Acetylene ND 2 ug/L
Carbon Dioxide 150 2 mg/L
Sample ID. No.MW-4
Date Sampled 6/8/2023
Sample Depth 30 ft

Reporting
Limit Units Flags
Dimethyl Sulfide ND 10 ug/L
MTBE ND 10 ug/L
1,2-Dichloroethane ND 10 ug/L
Benzene 520 10 ug/L
Toluene 3700 10 ug/L
Ethylbenzene 700 10 ug/L
m/p-Xylene 2900 10 ug/L
o-Xylene 1400 10 ug/L
1,2,4-Trimethylbenzene 1400 10 ug/L
Naphthalene 880 10 ug/L
TVPH 23 10 mg/L
% Surrogate Recovery
1,2-Dichloroethane-d4 99
d8-Toluene 100
p-Bromofluorobenzene 97
Lactate ND 2 mg/L
Acetate ND 2 mg/L
Propionate ND 2 mg/L
Formate/Isobutyrate ND 2 mg/L
Butyrate ND 2 mg/L
Pyruvate ND 2 mg/L
Chloride 18 2 mg/L
Nitrite ND 2 mg/L
Succinate ND 10 mg/L
Nitrate 4.4 2 mg/L
Sulfate 2.1 2 mg/L
Phosphate NA 2 mg/L
Sulfide ND 2 mg/L
Methane 45 20 ug/L
Ethane ND 2 ug/L
Ethylene ND 2 ug/L
Propane ND 2 ug/L
Propylene ND 2 ug/L
Isobutane ND 2 ug/L
n-Butane 4.9 2 ug/L
Acetylene ND 2 ug/L
t-2-Butene ND 2 ug/L
1-Butene ND 2 ug/L
Isobutylene ND 2 ug/L
cis-2-Butene ND 2 ug/L
1,3-Butadiene ND 2 ug/L
Methyl Acetylene ND 2 ug/L
Carbon Dioxide 100 2 mg/L
Sample ID. No.MW-8
Date Sampled 6/8/2023
Sample Depth 30 ft

Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/L
MTBE ND 0.5 ug/L
1,2-Dichloroethane ND 0.5 ug/L
Benzene 5.3 0.5 ug/L
Toluene 15 0.5 ug/L
Ethylbenzene 6.9 0.5 ug/L
m/p-Xylene 30 0.5 ug/L
o-Xylene 19 0.5 ug/L
1,2,4-Trimethylbenzene 13 0.5 ug/L
Naphthalene 8.9 0.5 ug/L
TVPH ND 0.5 mg/L
% Surrogate Recovery
1,2-Dichloroethane-d4 96
d8-Toluene 101
p-Bromofluorobenzene 104
Lactate ND 2 mg/L
Acetate ND 2 mg/L
Propionate ND 2 mg/L
Formate/Isobutyrate ND 2 mg/L
Butyrate ND 2 mg/L
Pyruvate ND 2 mg/L
Chloride 35 2 mg/L
Nitrite ND 2 mg/L
Succinate ND 10 mg/L
Nitrate 2 2 mg/L
Sulfate ND 2 mg/L
Phosphate NA 2 mg/L
Sulfide ND 2 mg/L
Methane ND 20 ug/L
Ethane ND 2 ug/L
Ethylene ND 2 ug/L
Propane ND 2 ug/L
Propylene ND 2 ug/L
Isobutane ND 2 ug/L
n-Butane ND 2 ug/L
Acetylene ND 2 ug/L
t-2-Butene ND 2 ug/L
1-Butene ND 2 ug/L
Isobutylene ND 2 ug/L
cis-2-Butene ND 2 ug/L
1,3-Butadiene ND 2 ug/L
Methyl Acetylene ND 2 ug/L
Carbon Dioxide 160 2 mg/L
Sample ID. No.MW-8R
Date Sampled 6/8/2023
Sample Depth 30 ft

Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/L
MTBE 1.9 0.5 ug/L
1,2-Dichloroethane ND 0.5 ug/L
Benzene 0.6 0.5 ug/L
Toluene 3.9 0.5 ug/L
Ethylbenzene 0.8 0.5 ug/L
m/p-Xylene 3.3 0.5 ug/L
o-Xylene 2 0.5 ug/L
1,2,4-Trimethylbenzene 2.5 0.5 ug/L
Naphthalene 2.8 0.5 ug/L
TVPH ND 0.5 mg/L
% Surrogate Recovery
1,2-Dichloroethane-d4 98
d8-Toluene 100
p-Bromofluorobenzene 102
Lactate ND 2 mg/L
Acetate ND 2 mg/L
Propionate ND 2 mg/L
Formate/Isobutyrate ND 2 mg/L
Butyrate ND 2 mg/L
Pyruvate ND 2 mg/L
Chloride 31 2 mg/L
Nitrite ND 2 mg/L
Succinate ND 10 mg/L
Nitrate 4.3 2 mg/L
Sulfate ND 2 mg/L
Phosphate NA 2 mg/L
Sulfide ND 2 mg/L
Methane ND 20 ug/L
Ethane ND 2 ug/L
Ethylene ND 2 ug/L
Propane ND 2 ug/L
Propylene ND 2 ug/L
Isobutane ND 2 ug/L
n-Butane ND 2 ug/L
Acetylene ND 2 ug/L
t-2-Butene ND 2 ug/L
1-Butene ND 2 ug/L
Isobutylene ND 2 ug/L
cis-2-Butene ND 2 ug/L
1,3-Butadiene ND 2 ug/L
Methyl Acetylene ND 2 ug/L
Carbon Dioxide 5.8 2 mg/L
Sample ID. No.RDC-01
Date Sampled 6/8/2023
Sample Depth 30 ft

Reporting
Limit Units Flags
Dimethyl Sulfide ND 5 ug/L
MTBE 13 5 ug/L
1,2-Dichloroethane ND 5 ug/L
Benzene 2200 5 ug/L
Toluene 12200 5 ug/L E
Ethylbenzene 2900 5 ug/L
m/p-Xylene 8600 5 ug/L
o-Xylene 4500 5 ug/L
1,2,4-Trimethylbenzene 3000 5 ug/L
Naphthalene 960 5 ug/L
TVPH 78 5 mg/L
% Surrogate Recovery
1,2-Dichloroethane-d4 91
d8-Toluene 103
p-Bromofluorobenzene 98
Lactate ND 2 mg/L
Acetate ND 2 mg/L
Propionate ND 2 mg/L
Formate/Isobutyrate ND 2 mg/L
Butyrate ND 2 mg/L
Pyruvate ND 2 mg/L
Chloride 21 2 mg/L
Nitrite ND 2 mg/L
Succinate ND 10 mg/L
Nitrate ND 2 mg/L
Sulfate ND 2 mg/L
Phosphate NA 2 mg/L
Sulfide ND 2 mg/L
Methane 28 20 ug/L
Ethane ND 2 ug/L
Ethylene ND 2 ug/L
Propane ND 2 ug/L
Propylene ND 2 ug/L
Isobutane 2.8 2 ug/L
n-Butane 39 2 ug/L
Acetylene ND 2 ug/L
t-2-Butene ND 2 ug/L
1-Butene ND 2 ug/L
Isobutylene ND 2 ug/L
cis-2-Butene ND 2 ug/L
1,3-Butadiene ND 2 ug/L
Methyl Acetylene ND 2 ug/L
Carbon Dioxide 140 2 mg/L
Sample ID. No.RDC-02
Date Sampled 6/8/2023
Sample Depth 30 ft

Reporting
Limit Units Flags
Dimethyl Sulfide ND 0.5 ug/L
MTBE ND 0.5 ug/L
1,2-Dichloroethane ND 0.5 ug/L
Benzene 5100 25 ug/L
Toluene 26400 25 ug/L
Ethylbenzene 4200 25 ug/L
m/p-Xylene 14100 25 ug/L
o-Xylene 7200 25 ug/L
1,2,4-Trimethylbenzene 3100 25 ug/L
Naphthalene 710 25 ug/L
TVPH 91 25 mg/L
% Surrogate Recovery
1,2-Dichloroethane-d4 75
d8-Toluene 99
p-Bromofluorobenzene 82
Lactate ND 2 mg/L
Acetate ND 2 mg/L
Propionate ND 2 mg/L
Formate/Isobutyrate ND 2 mg/L
Butyrate ND 2 mg/L
Pyruvate ND 2 mg/L
Chloride 34 2 mg/L
Nitrite ND 2 mg/L
Succinate ND 10 mg/L
Nitrate ND 2 mg/L
Sulfate ND 2 mg/L
Phosphate NA 2 mg/L
Sulfide ND 2 mg/L
Methane 23 20 ug/L
Ethane ND 2 ug/L
Ethylene 6 2 ug/L
Propane ND 2 ug/L
Propylene ND 2 ug/L
Isobutane 3.7 2 ug/L
n-Butane 58 2 ug/L
Acetylene ND 2 ug/L
t-2-Butene ND 2 ug/L
1-Butene ND 2 ug/L
Isobutylene ND 2 ug/L
cis-2-Butene ND 2 ug/L
1,3-Butadiene ND 2 ug/L
Methyl Acetylene ND 2 ug/L
Carbon Dioxide 130 2 mg/L

Attachment B
Soil Boring Logs

34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
100
100
100
100
100
RDC-01 (11')
RDC-01 (13')
RDC-01 (15')
RDC-01 (17')
RDC-01 (19')
RDC-01 (21')
RDC-01 (23')
RDC-01 (25')
RDC-01 (27.5')
RDC-01 (29')
RDC-01 (31')
RDC-01 (33')
<0.5
<0.5
<0.5
<0.5
<0.5
<0.5
<0.5
2.4
250
44
340
24
ML
SM
ML
Geological logging not performed
Dry red sandy silt
Dry tan medium silty sand
Dry red sandy silt
Moist red sandy silt vertical black streaking 21-25',
slight chlorine odor
Moist red sandy silt, petroleum odor, gravel lenses
at 27.5' and 30'
Refusal at 32'
<0.5
<0.5
<0.5
<0.5
<0.5
1.9
<0.5
3.2
130
170
440
530
DESCRIPTION
NAME (USCS): color, sorting, plasticity,
moisture, sorting, grain size, packing
Withers Ravenel - Arvin Oil
GEX
Direct Push
Geoprobe 3230
3.25 Dual Tube
Nathan Mau
Nathan Thacker
RDC-01
REC-OVERY(%)LAB I.D.DEPTH(feet)WELL CONSTRUCTION
DETAILS AND/OR
DRILLING REMARKS
TVPH (soil)
(ppm)
PROJECT MANAGER:
PROJECT:
BORING IDENTIFICATION:
DRILLING CONTRACTOR:
DRILLING METHOD:
SAMPLING METHOD:
DRILLING EQUIPMENT:
REG. NO.
LOGGED BY:
DEPTH TO WATER:CASING:
TOTAL DEPTH:SCREEN INTERVAL:
DATE FINISHED:
DATE STARTED:
NORTHING:
EASTING:
ELEVATION:
June 8, 2023
June 8, 2023
32'27-32
Benzene (soil)
(ppb)
AST Environmental Inc.Project No.Page 1 of 15152399
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
100
100
100
100
100
RDC-02 (11')
RDC-02 (13')
RDC-02 (15')
RDC-02 (17')
RDC-02 (19')
RDC-02 (21')
RDC-02 (23')
RDC-02 (25')
RDC-02 (27')
RDC-02 (29')
RDC-02 (31')
RDC-02 (33')
<0.5
<0.5
<0.5
<0.5
0.6
0.7
0.8
<10
18
41
24
15
ML
SM
ML
GM
ML
Geological logging not performed
Dry red sandy silt, slight chlorine odor
Silty fine angular gravel, dry
Dry red sandy silt, slight chlorine odor
Moist red sandy silt with black streaking throughout
Moist gray silty sand
Moist red sandy silt with black streaking
throughout, slight petroleum odor
Refusal at 34'
<0.5
<0.5
<0.5
<0.5
<0.5
<0.5
<0.5
<0.5
160
330
660
560
DESCRIPTION
NAME (USCS): color, sorting, plasticity,
moisture, sorting, grain size, packing
Withers Ravenel - Arvin Oil
GEX
Direct Push
Geoprobe 3230
3.25 Dual Tube
Nathan Mau
Nathan Thacker
RDC-02
REC-OVERY(%)LAB I.D.DEPTH(feet)WELL CONSTRUCTION
DETAILS AND/OR
DRILLING REMARKS
TVPH (soil)
(ppm)
PROJECT MANAGER:
PROJECT:
BORING IDENTIFICATION:
DRILLING CONTRACTOR:
DRILLING METHOD:
SAMPLING METHOD:
DRILLING EQUIPMENT:
REG. NO.
LOGGED BY:
DEPTH TO WATER:CASING:
TOTAL DEPTH:SCREEN INTERVAL:
DATE FINISHED:
DATE STARTED:
NORTHING:
EASTING:
ELEVATION:
June 8, 2023
June 8, 2023
34'29-34
Benzene (soil)
(ppb)
AST Environmental Inc.Project No.Page 1 of 15152399

Attachment C
BOS 200 Injection Design

CROWN FLOORING LLC(FORMER GAS STATION)FORMERUSTAREACONCRE
T
E

S
L
A
BMW-2RMW-10MW-7MW-6RMW-3RMWD-7MW-1MWD-9MWD-6WSW-2RESIDENCERESIDENCERESIDENCEFAYETTEVILLE ROAD(HIGHWAY 401)GARAGE/STORAGEBUILDINGWOODENSHEDMWD-14MWD-15MW-11MW-12MWD-13MW-16MW-17MWD-17MW-8MW-4MWD-5FORMER HYDRAULICLIFT AREAESTIMATED EXTENT OF BENZENE ATCONCENTRATIONS EXCEEDING 2LSTANDARD - SURFICIAL AQUIFER1.01.0(<0.5)(0.893)(1,540)(10.9)(<0.5)(<0.5)(5,020)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)(<0.5)LEGEND WATER SUPPLY WELL TYPE II MONITORING WELL BENZENE CONCENTRATION ESTIMATED EXTENT OF GROUNDWATER BENZENE CONTAMINATION AT LEVELS EXCEEDING NC 2L STANDARD (1.0 ug/L)NOTES: 1.) 2021 AERIAL OBTAINED FROM NC ONE MAP. 2.) ALL DATA SHOWN IN ug/L. 3.) VALUES SHOWN IN RED EXCEED NC GCL FOR BENZENE.(1,540)GROUNDWATER BENZENEISOCONCENTRATION MAP
MARCH 2023
DRAWN BY:
5
SCALE:FIGURE NO.:
PROJECT NO.:DATE:APPROVED BY:
ARVIN OIL COMPANYTF#13379
5837 & 5839 FAYETTEVILLE ROAD (US HIGHWAY 401)RALEIGH, WAKE COUNTY, NC
WithersRavenel
Engineers | Planners | Surveyors
115 MacKenan Drive | Cary, NC 27511 | t: 919.469.3340 | license #: F-1479 | www.withersravenel.com
1"=30 'GRAPHIC SCALE1 inch = 30 ft.0301560KBB
MJ 04/05/2023 23-0307-N
Client Name Withers Ravenel
Project Location Arvin Oil - Raleigh, NC
Area A
MW-3R
Site Information Predominate Geology of Treatment Zone Saprolite
Treatment Zone Area (ft^2)1,460 1,460
Contamination Depth Start (ft bgs)27.0
Contamination Depth End (ft bgs)35.0
Treatment Volume (yd^3)432.6 433
Triangular Grid Spacing (ft)7.5
Number of Injection Points - Design 26 26
Injection Interval Distance (ft)2.0
Number of Injection Intervals per Point - Design 4.5
Total Number of Injection Intervals 117 117
Speciated COC Design Calculations Contaminant of Concern Benzene
Design Basis Soil (mg/kg) or Groundwater (mg/L)Groundwater
Design Concentration 25.000
Interim Design Endpoint 1.000
Contaminant of Concern Mass Loading (lb/ft^3)4.68E-04
BOS 200 per Injection Interval - Design (lb)40
BOS 200 Slurry Volume per Interval (gal)25
Average BOS 200 per Injection Point (lb)180
BOS 200 Total (lb)4,680 4,700
TPH Design Calculations TPH Groundwater Concentration (mg/L)7
Average TPH Soil Concentration (mg/kg)300
TPH Mass (lb)388
Design Basis Select Speciated or TPH Speciated
Design BOS 200 Total per Area (lb)4,680 4,700
Trap & Treat Bacteria Calculations Bacteria Concentrate (gal)9 10
Kinetic Design Additives Supplemental Gypsum per Interval - Design (lb)25
Total Supplemental Gypsum (lb)2,925 2,950
Supplemental Magnesium Sulfate per Interval - Design (lb)25.0
Total Supplemental Magnesium Sulfate (lb)2,925 2,950
Food Grade Starch per Interval (lb)12.5
Total Food Grade Starch (lb)1,463 1,500
Yeast Extract per Interval (lb)0.33
Total Yeast Extract (lb)39 55
Slurry and Water Volumes Slurry Volume per Interval (gal)25
Estimated Water Volume (gal)2,925 2,925
Totals
9/29/2023
Client Name Withers Ravenel
Project Location Arvin Oil - Raleigh, NC
Summary BOS 200 Total (lb)4,700
BOS 200 Unit Price ($/lb, per RPI website)$6.25
Bacteria Concentrate (gal)10
Bacteria Concentrate Price ($/gal, per RPI website)$115
Supplemental Gypsum Total (lb)2,950
Gypsum Unit Price ($/lb)$0.50
Magnesium Sulfate Total (lb)2,950
Magnesium Sulfate Unit Price ($/lb)$0.65
Food Grade Starch Total (lb)1,500
Food Grade Starch Unit Price ($/lb)$0.50
Yeast Extract Total (lb)55
Yeast Extract Unit Price ($/lb)$13.50
Estimated Shipping and Tax ($/lb)$0.40
Total Material Price ($)$37,290
Number of Field Days to Complete 3
Mobilization ($)$3,000
Injection Location Markout ($)$0
Total Installation Price ($)$24,600
Total Estimated Price ($)$61,890
9/29/2023

ATTACHMENT B 

SITE PHOTOGRAPHS 

Arvin Oil Company – Incident # 13379 WR Project # 23‐0307‐N 
Letter Report – Remedial Design Characterization  October 2023 

 PHOTO 1 
TYPICAL RDC BORING INSTALLATION (RDC‐01) 

 PHOTO 2 
GENERAL LOCATION OF BORING RDC‐02 (RIGHT OF WELL AT CENTER)