22-105973-Phase II ESA-01-12-2315365 N.E. 90th Street, Suite 100 • Redmond, WA 98052 • (425) 449-4704 • FAX (425) 449-4711
Earth Solutions NW LLC
Geotechnical Engineering, Construction
Observation/Testing and Environmental Services
August 31, 2022
ES-8771
Amalani, LLC
415 – 1st Avenue North, Unit 9998
Seattle, Washington 98109
Attention: Mr. Barry Margolese
Subject: Limited Phase II Environmental Site Assessment
Tacoma Smelter Plume Soil Sampling
Creekwood Plat
South of 22nd Avenue Southwest and Southwest 309th Court
Federal Way, Washington
Reference: Barghausen Consulting Engineers, Inc.
Preliminary Grading and Utility Plan
Creekwood Plat, dated March 12, 2022
Washington State Department of Ecology
Tacoma Smelter Plume Model Remedies Guidance,
dated July 2019
Dear Mr. Margolese:
This letter presents the results of the Limited Phase II Environmental Site Assessment (ESA)
performed by Earth Solutions NW, LLC (ESNW) at the above-referenced Creekwood Plat
property (subject property) at the request of Amalani, LLC (Client). The Limited Phase II ESA
soil sampling activities were performed at the subject property to assess potential shallow soil
contamination associated with airborne arsenic and lead fallout from the historical Asarco
Smelter, formerly located in Tacoma, Washington (area referred to as the Tacoma Smelter
Plume). It should be noted that Tacoma Smelter Plume (TSP) characterization soil sampling
completed during this investigation was completed in accordance with the above-referenced
Washington State Department of Ecology (Ecology) TSP Model Remedies Guidance document
for sampling and cleanup of arsenic and lead contaminated soils (dated July 2019).
Based on the analytical laboratory results of this Limited Phase II ESA, elevated concentrations
of arsenic, exceeding the Model Toxics Control Act (MTCA) Method A arsenic soil cleanup level
for unrestricted land-use (CUL) of 20 milligrams per kilogram (mg/kg), were identified in two
composite duff locations. No concentrations of lead in site soil exceed the MTCA Method A lead
CUL of 250 milligrams per kilogram (mg/kg). Additionally, average concentrations of arsenic in
site soil are below the MTCA Method A arsenic soil CUL of 20 mg/kg, with no single soil sample
containing concentrations of arsenic at or greater than double the MTCA Method A arsenic soil
CUL (40 mg/kg).
Amalani, LLC ES-8771
August 31, 2022 Page 2
Earth Solutions NW, LLC
According to Ecology’s 2019 TSP Model Remedies Guidance, elevated concentrations of arsenic
identified in composite duff samples during this investigation will require remediation as part of or
prior to planned residential development activities at the subject property.
The body of this letter should be referenced for further details regarding the field activities and
findings of this Limited Phase II ESA.
Site Description
The subject property is located south of the southern terminus of 22nd Avenue Southwest,
approximately 170 feet south of the intersection with Southwest 309th Court, in Federal Way,
Washington (see Plate 1 – Vicinity Map). The subject property consists of one tax parcel (King
County Parcel No. 122103-9037), comprising a total of approximately 19.86 acres of land area.
The subject property is currently undeveloped and lightly to moderately forested.
The subject property was determined to be located within an area designated by Ecology to have
average concentrations of arsenic in soil ranging from 40 mg/kg to 100 mg/kg, exceeding the
MTCA Method A arsenic CUL for soil (20 mg/kg).
Based on the above-referenced preliminary site plan, approximately 8 acres along the northern
portion of the subject property is proposed for residential development. Preliminary plans indicate
the southern sloped portions of the subject property will remain undeveloped. Specifically, this
Limited Phase II ESA characterizes soil conditions within the proposed 8 acres of development
envelope and not in areas which will remain undisturbed and forested.
Decision Units
A “Decision Unit” is an “Area of a property expected to have a different pattern of soil
contamination than other areas. Some properties will only have one decision unit. Factors
include current and past land uses and development history…[and]…Future use can also define
decision units” (page 11 of Ecology’s TSP Model Remedies Guidance document). Based on the
understanding that approximately 8 acres of subject property will be redeveloped for residential
land-use, the proposed development envelope along the northern portion of the property was
treated as one Decision Unit for the purposes of this TSP characterization shallow soil sampling
assessment. The remaining portions of the property will remain undeveloped and forested and
were not included within the sampling schedule.
See Plate 2 to reference site dimensions and the existing site conditions.
Based on Table 1 (page 13) and Table 1a (page 16) of the referenced TSP Model Remedies
Guidance, ESNW calculated the minimum number of soil samples that would need to be collected
in accordance with the TSP Model Remedies Guidance. See attached “Form 1 –
Characterization Sampling” for reference, with calculations on page three of the form. At a
minimum, the following number of soil samples needed to be collected across the subject
property: 44 soil samples at a depth of zero to six inches into native soil, 11 soil samples at a
depth of 6 to 12 inches into native soil, and 11 forest duff composite samples.
Amalani, LLC ES-8771
August 31, 2022 Page 3
Earth Solutions NW, LLC
See below for discussion of on-site soil sampling activities.
Field Activities
Field activities involved with completing this Limited Phase II ESA were performed on August 4
and August 5, 2022.
ESNW used site plans to identify evenly spaced and accurately plotted sampling locations in an
approximate grid pattern throughout the proposed 8-acre development envelope. As discussed
in the previous section of this letter, 44 discrete soil samples were collected at a depth of zero to
six inches bgs. 11 soil samples were collected from depths of 6 to 12 inches bgs. Additionally,
11 forest duff composite samples (each consisting of six evenly spaced forest duff subsamples)
were also collected across the subject property. A handheld post-hole digger was used to
manually collect each soil and/or forest duff composite sample. See Plate 3 to review sampling
locations.
Soil Sampling Methods
Each soil sample was carefully transferred from the post-hole digger into a stainless-steel bowl
before being transferred to a pre-cleaned 8-oz glass sampling jar and sealed with a Teflon-lined
plastic lid. All tools and equipment used during soil sampling activities were cleaned in separate
wash and rinse buckets prior to and between the collection of each soil sample. Additionally,
nitrile gloves were worn during sampling activities and replaced with a clean pair between
collection of each soil sample.
The jars containing the soil samples were labeled and stored on ice in a 5°C cooler, and delivered
to On-Site Environmental Laboratories, Inc. (a Washington State-certified laboratory), located in
Redmond, Washington, to be analyzed for the following constituents:
Total Arsenic by Environmental Protection Agency (EPA) Analytical Method 6020B.
Total Lead by EPA Analytical Method 6020B.
Applicable Regulatory Standards – Soil
The rules that guide the cleanup process at sites within Washington State are incorporated into
MTCA, as administered by Ecology and defined in WAC 173-340. For this letter, average values
for total arsenic and lead concentrations (reported in the On-Site Environmental Laboratories,
Inc. analytical reports) were compared to MTCA Method A CULs for soil. The Method A CULs
are conservative and are for sites with relatively few hazardous substances, which may not be
appropriate for all sites. The regulations state that Method A should not be automatically used to
define cleanup levels that must be met for financial, real estate, insurance coverage, or similar
purposes. Additionally, test results above Method A cleanup levels do not necessarily mandate
a cleanup action for a site. The referenced TSP Model Remedies Guidance document uses
MTCA Method A CULs.
Amalani, LLC ES-8771
August 31, 2022 Page 4
Earth Solutions NW, LLC
Copies of the laboratory analytical reports are attached to this letter. Applicable MTCA Method
A CULs used during this Limited Phase II ESA include the following:
The MTCA Method A arsenic CUL for soil is 20 mg/kg.
The MTCA Method A lead CUL for soil is 250 mg/kg.
It should be noted that, according to Ecology’s 2019 TSP Model Remedies Guidance, “elevated
concentrations” of arsenic and lead are defined as follows: average concentrations of total arsenic
in soil exceeding Ecology’s MTCA Method A arsenic CUL, 20 mg/kg; average concentrations of
total lead in soil exceeding the lead MTCA Method A CUL, 250 mg/kg; or a single sample with
concentrations of arsenic or lead exceeding double the above-identified MTCA Method A CULs.
Analytical Results
Arsenic
Analytical results indicate that the average concentrations of arsenic in site soil are as follows:
Depth of zero to six inches bgs: 12.8 mg/kg (below the MTCA Method A arsenic CUL of
20 mg/kg); and,
Depth of 6 to 12 inches bgs: 11 mg/kg (below the MTCA Method A arsenic CUL).
Two composite duff samples, Duff-2 (22 mg/kg) and Duff-7 (24mg/kg) contained arsenic
concentrations exceeding the MTCA Method A arsenic CUL. No single soil or composite duff
sample contained arsenic concentrations exceeding double the MTCA Method A arsenic CUL.
In conclusion, elevated concentrations of arsenic were identified in two composite duff locations.
No elevated concentrations of arsenic were identified in site soil.
Lead
Analytical results indicate that the average concentrations of lead in site soil are as follows:
Depth of zero to six inches bgs: 18.6 mg/kg (below the MTCA Method A lead CUL of 250
mg/kg); and,
Depth of 6 to 12 inches bgs: 7.3 mg/kg (below the MTCA Method A lead CUL);
No single soil or composite duff sample contained concentrations at or exceeding double the
MTCA Method A lead CUL. In conclusion, no elevated concentrations of lead were identified in
site soil or forest duff.
Laboratory analytical reports are attached to this letter for review. Also, see the attached “Form
2 – Characterization Sampling Results” document that separately summarizes the above-
discussed results as required in Ecology’s TSP Model Remedies Guidance document.
Amalani, LLC ES-8771
August 31, 2022 Page 5
Earth Solutions NW, LLC
Summary and Conclusions
Consistent with the Client’s request, ESNW completed a Limited Phase II ESA at the subject
property. This investigation included: (1) collecting 66 discrete soil samples across the northern
8 acres of the subject property in accordance with the referenced TSP Model Remedies Guidance
document (Ecology, July 2019); (2) submitting the soil samples to a Washington State-certified
laboratory to be analyzed for the presence of total arsenic and lead; and (3) completion of this
letter.
In conclusion, laboratory analytical results identified elevated concentrations (as defined in the
“Applicable Regulatory Standards – Soil” section of this letter) of arsenic in two composite duff
locations at the subject property. The two elevated locations are composite duff sample locations
identified as Duff-2 and Duff-7 (see attached Plate 3). This letter presents evidence that the site
has been impacted by elevated concentrations of arsenic from historical operation of the Asarco
Smelter.
Recommendations
Based on the findings of this assessment, remediation will be necessary at the subject site in
connection with elevated concentrations of arsenic in forest duff associated with the positioning
of the site in the TSP.
1. ESNW recommends dilution, or soil mixing, of elevated concentrations of arsenic in duff
across areas planned for residential redevelopment.
Soil mixing can be completed by several different methods described in further detail in
the TSP Model Remedies Guidance document (Ecology, July 2019), which include the two
following options: (1) segregate the upper six inches of soil and topsoil/forest duff into
stockpiles to be mixed with deeper native soil or clean imported soil; or (2) till the upper 18
inches of soil to stir lower, cleaner soil with shallower arsenic-impacted soil. If forest duff
and topsoil are to be reused on-site, mixing of clean sand, soil, or imported clean topsoil
will need to be completed to dilute concentrations of arsenic in forest duff before reuse. It
should be noted that ESNW can provide a separate cleanup action plan discussing further
detail and requirements involved with necessary soil mixing activities, including worker
health and safety.
2. During soil mixing activities, ESNW recommends sufficient wetting of soil and forest duff
to prevent possible inhalation of airborne arsenic from the upper six inches of site soil.
Additionally, anyone handling soil within the upper six inches of the site prior to or during
soil mixing activities should practice adequate handwashing (with water and soap) prior to
meals or touching one’s face. These recommendations should be discussed in further
detail with a site-specific health and safety plan to be used during initial development
activities prior to successful arsenic remediation.
3. Confirmation soil sampling will need to be completed at the subject site redevelopment
areas after soil mixing and/or within all stockpiles of diluted soil to verify that soil mixing
activities and remediation of arsenic impacts were successful.
4. ESNW recommends applying for a no further action (NFA) determination from Ecology for
the planned redevelopment areas once the final plat is recorded for the subject site.
Amalani, LLC ES-8771
August 31, 2022 Page 6
Earth Solutions NW, LLC
Limitations
The work described herein was performed upon request by the Client after discussions relating
to the potential for TSP-related arsenic and lead soil impacts at the subject property. The findings
and recommendations in this letter are made based upon the analytical results, field observations,
and our best professional judgement. It is possible that unforeseen events could occur that may
limit the effectiveness of the assessment. Although risk can never be eliminated, more detailed
and extensive sampling and testing would yield better management of site risks. Since such
extensive services involve greater expense, we ask our clients to participate in identifying the
level of service that will provide them with an acceptable level of risk. Please contact the
signatories of this letter if you would like to discuss this issue of risk further.
The scope of work on this project was presented in our July 27, 2022 Phase II Environmental
Site Assessment proposal (Proposal No. PES-8771) and subsequently approved by Amalani,
LLC as our Client. Please be aware our scope of work was limited to those items specifically
identified in the proposal. Other activities not specifically included in the presented scope of work
(in the proposal, correspondence, or this letter) are excluded and should not be considered part
of our scope of services.
Land use, site conditions (both on-site and off-site), and other factors will change over time. Since
site activities and regulations beyond our control could change at any time after the completion
of this letter, our observations, findings, and opinions can be considered valid only as of the date
of the site visit (August 5, 2022).
This letter may be used by the Client and only for the purposes stated within a reasonable time
from its issuance, but in no event later than one year from the date of this letter.
Any party other than the Client who would like to use this letter shall notify ESNW of such intended
use. Based on the intended use of this letter, ESNW may require that additional work be
performed and that a revised letter be issued. Non-compliance with any of these requirements
by the client or anyone else will release ESNW from any liability resulting from the use of this
letter by any unauthorized party. No warranty, either expressed or implied, is made.
Amalani, LLC ES-8771
August 31, 2022 Page 7
Earth Solutions NW, LLC
Closing
We trust this letter meets your current needs and appreciate the opportunity to provide our
consulting services to American Pride Lending, LLC. Please contact the undersigned at (425)
449-4704 if you have any questions or require additional information.
Sincerely,
EARTH SOLUTIONS NW, LLC
Kyler T. Kelly, L.G. Ted W. Sykes
Project Geologist Environmental Senior Project Manager
Kyle R. Campbell, P.E.
Principal Engineer
Attachments: Plate 1 – Vicinity Map
Plate 2 – Decision Units
Plate 3 – Soil Sampling Location Plan
Form 1 – Characterization Sampling
Form 2 – Characterization Sampling Results
OnSite Environmental Analytical Laboratory Reports
cc: Barghausen Consulting Engineers, Inc.
Attention: Mr. Tom Barghausen (Email only)
Geotechnical Engineering,Construction
Observation/Testing and Environmental Services
Drwn.MRS
Checked KTK Date Aug.2022
Date 08/22/2022 Proj.No.8771
Plate 1
Earth Solutions NWLLCEarthSolutionsNWLLC
EarthSolutions
NW LLC
Vicinity Map
Creekwood Plat
Federal Way,Washington
Reference:
King County,Washington
OpenStreetMap.org
NORTH
NOTE:This plate may contain areas of color.ESNW cannot be
responsible for any subsequent misinterpretation of the information
resulting from black &white reproductions of this plate.
SITE
Federal Way
Plate
Proj.No.
Date
Checked By
Drwn.ByEarthSolutionsNWLLCGeotechnicalEngineering,ConstructionObservation/TestingandEnvironmentalServicesEarthSolutionsNWLLCEarthSolutionsNWLLCMRS
NORTH
NOT -TO -SCALE NOTE:This plate may contain areas of color.ESNW cannot be
responsible for any subsequent misinterpretation of the information
resulting from black &white reproductions of this plate.
NOTE:The graphics shown on this plate are not intended for design
purposes or precise scale measurements,but only to illustrate the
approximate test locations relative to the approximate locations of
existing and /or proposed site features.The information illustrated
is largely based on data provided by the client at the time of our
study.ESNW cannot be responsible for subsequent design changes
or interpretation of the data by others.
LEGEND
Forested and
Undeveloped
Decision Unit 1:
Residential
KTK
08/26/2022
8771
2DecisionUnits CreekwoodPlatFederalWay,Washington~1,300 ft ~650ft21
ST
AVE
NUE
S.W.22NDAVE. S.W.Undeveloped and
Forested Land
150 160
220230
240 250 260
150
160
170
180
190
200
210
220 230
250
260
220
230
170 180 190 200
140
140
210 220 240 250
260
220
230
250 240
230
190
200
210
220
200
210
240
250
230
190
260240250 270 280
270
280240
Undeveloped and
Forested Land
Plate
Proj.No.
Date
Checked By
Drwn.ByEarthSolutionsNWLLCGeotechnicalEngineering,ConstructionObservation/TestingandEnvironmentalServicesEarthSolutionsNWLLCEarthSolutionsNWLLCMRS
NORTH
NOT -TO -SCALE NOTE:This plate may contain areas of color.ESNW cannot be
responsible for any subsequent misinterpretation of the information
resulting from black &white reproductions of this plate.
NOTE:The graphics shown on this plate are not intended for design
purposes or precise scale measurements,but only to illustrate the
approximate test locations relative to the approximate locations of
existing and /or proposed site features.The information illustrated
is largely based on data provided by the client at the time of our
study.ESNW cannot be responsible for subsequent design changes
or interpretation of the data by others.
LEGEND
Subject Site
Duff
Approximate Location of
Test
KTK
08/22/2022
8771
3SoilSamplingLocationPlan CreekwoodPlatFederalWay,WashingtonSS-1
Duff-1
Duff-2
Duff-3
Duff-4
Duff-5
Duff-6
Duff-7
Duff-8
Duff-9
Duff-10
Duff-11 21
ST
AVE
NUE
S.W.22NDAVE. S.W.150 160
220230
240 250 260
150
160
170
180
190
200
210
220 230
250
260
220
230
170 180 190 200
140
140
210 220 240 250
260
220
230
250 240
230
190
200
210
220
200
210
240
250
230
190
260240250 270 280
270
280240
SS-41
SS-42
SS-43
SS-44
SS-44:12"
SS-40
SS-40:12"
SS-39
SS-38
SS-37 SS-36
SS-36:12"
SS-35
SS-34
SS-33 SS-32
SS-32:12"
SS-31
SS-30
SS-29
SS-28
SS-28:12"
SS-27
SS-26
SS-25
SS-24
SS-24:12"
SS-23
SS-22
SS-21
SS-20
SS-20:12"
SS-19
SS-18
SS-17
SS-16
SS-16:12"
SS-15
SS-14
SS-13 SS-12
SS-12:12"
SS-11
SS-10
SS-5
SS-6
SS-7
SS-8
SS-8:12"
SS-9
SS-4
SS-4:12"
SS-3
SS-2
SS-1
Washington Department of Ecology Tacoma Smelter Plume Model Remedies Guidance 77
Characterization Sampling
Reminder: Keep a copy of the filled out forms to pass on to future property owners.
Part 1: Determine your decision units
1. Total property size: _________ acres
2. In an area of arsenic >100 ppm (see map on inside cover): yes no
3. Check all that apply and identify decision units in any of these cases:
Property is larger than 0.25 acres
Property currently or historically had a mix of forested and developed land.
More than one type of land use is planned for the development
Parts of the property will be play areas, gardens, or other high use areas
Property has geographic features, such as steep slopes or wetlands
Areas have forest duff that needs separate sampling
4. On the next page, list the decision units on your property and their size in Table 1.
Use Table 2 to determine the number of samples needed for each decision unit.
Part 2: Soil sample depth in upland areas
5. Fill in Table 1 on the following page with the sample depths.
At every location:Take samples from the top 0-6 inches of soil, after
clearing away grass, leaves, gravel, or debris on the surface (Figure 3)
At every fourth location (25% of the samples):Also take a sample from
the 6-12 inch depth
If you are sampling in natural areas:Take soil samples from 0-6 inches
below ground surface (bgs), 6-12 inches bgs, 12-24 inches bgs, 24-36 inches
bgs from every location
Areas where fill dirt or topsoil was added in the past:At every fourth
location, take a sample from the top 0-6 inches of the original land surface, if
it is deeper than 12 inches
If using mixing as a remedy:At every fourth sample location, take a
sample from the depth you to which you will mix
For forest duff: Take six subsamples throughout the decision unit and
combine into one sample. If your decision unit is larger than 0.25 acres,
Form 1
Washington Department of Ecology Tacoma Smelter Plume Model Remedies Guidance 78
calculate how many composite duff samples to take using Table 1a in
Chapter 1 of this guidance
Part 2A: Soil sample depth in wetlands
At every location:Take samples from the top 0-4 inches of sediment
At every location:Take samples from the top 4-8 inches of sediment
Part 3: Overlay a sampling grid for each decision unit
6. Attach a diagram showing property dimensions and locations of decision units.
7. Attach a separate diagram for each decision unit, including dimensions, existing
structures, and which structures will remain after development.
Table 1. Characterization sampling plan
Decision unit description
(past use, planned use)
Acres/ft2 # of
samples
Sample
depth/duff
layer
1.
2.
3.
4.
Washington Department of Ecology Tacoma Smelter Plume Model Remedies Guidance 79
Table 2. Number of sample locations per decision unit by planned use and
estimated arsenic level.
Sampling
area
Residential, parks, commercial (#
samples needed)
Forest and open land
(# samples needed)
Acres Arsenic >100
ppm
Arsenic <100 ppm Arsenic >100
ppm
Arsenic 20-100
ppm
0.25* 10 8 8 8
1 20 16 16 12
5 40 32 30 24
10 60 48 40 32
20 80 64 50 40
100 120 90 70 60
>100 120 +1 per 5
acres
90 + 1 per 5 acres 70 + 1 per 5
acres
60 + 1 per 5 acres
*0.25 acres ~11,000 square feet
This page intentionally left blank
Washington Department of Ecology Tacoma Smelter Plume Model Remedies Guidance 80
Washington Department of Ecology Tacoma Smelter Plume Model Remedies Guidance 81
Characterization Sampling Results
Reminder: Keep a copy of the filled out forms to pass on to future property owners.
Filling in the sample inventory
List the samples by decision unit in the inventory on the back of this page. Enter the
depth of each sample. When sampling multiple depths at a single location, mark
each depth as a separate sample number.
Optional: If you have duff, remember to sample and analyze that separately from
the soil.
Next, fill in the date and time. Note any unusual observations (high soil disturbance,
heavy rain, etc.) in the “Comments” column.
Complete the rest of the columns when you get the sampling results.
Determining if arsenic or lead is elevated
1. Calculate average arsenic and lead levels for each sampling depth and each
decision unit and enter them on the inventory sheet. For each decision unit
circle the arsenic average that exceeds 20 ppm, or average lead that exceeds
250 ppm. For decision units in natural areas, calculate average arsenic and lead
for each sampling location in addition to calculating the averages for each
sampling depth.
2. Circle every value where maximum arsenic exceeds 40 ppm and where
maximum lead exceeds 500 ppm.
3. Attach a copy of your lab results and chain of custody.
4. For decision units with a circled value (maximum or average), note in the
“Comment” column that cleanup is needed for that entire decision unit. Turn to
Chapter 2 to review options for cleaning up those decision units.
If no decision units have elevated arsenic or lead, no cleanup is necessary.
Because no cleanup is being done, you do not need to take any compliance
samples. The characterization samples demonstrate that your soils meet state
standards. Treat these results as “compliance” sampling results and read
Chapter 7 for next steps.
Form 2
Washington Department of Ecology Tacoma Smelter Plume Model Remedies Guidance 82
Soil Characterization Sampling Inventory Sheet
Property address:
Phone:
Sampled by:
Testing Parameters (ppm)
DU Sampl
e no.
Soil
Depth
/Duff
Date Time Notes Arsenic Avg.
arsenic
Lead Avg
lead
Property Address: No address available. Located South of 22nd Ave SW, in Federal Way, WA
Phone: 425.449.4704
Sampled By: Kyler Kelly Testing Parameters (ppm)
DU Sample No.Soil Depth/DuffDate Time Notes Arsenic Avg. Arsenic Lead Avg. Lead
1 SS-1 0-6"8/4/2022 10:00 Grab ND 12.8 18 18.6
1 SS-2 0-6"8/4/2022 10:15 Grab ND 12.8 ND 18.6
1 SS-3 0-6"8/4/2022 10:30 Grab ND 12.8 16 18.6
1 SS-4 0-6"8/4/2022 10:45 Grab ND 12.8 19 18.6
1 SS-4:12"6-12"8/4/2022 10:50 Grab ND 11 ND 7.3
1 SS-5 0-6"8/4/2022 11:05 Grab ND 12.8 18 18.6
1 SS-6 0-6"8/4/2022 11:20 Grab ND 12.8 14 18.6
1 SS-7 0-6"8/4/2022 11:35 Grab ND 12.8 18 18.6
1 SS-8 0-6"8/4/2022 11:50 Grab ND 12.8 20 18.6
1 SS-8:12"6-12"8/4/2022 11:55 Grab ND 11 20 7.3
1 SS-9 0-6"8/4/2022 12:10 Grab ND 12.8 15 18.6
1 SS-10 0-6"8/4/2022 12:25 Grab ND 12.8 13 18.6
1 SS-11 0-6"8/4/2022 12:40 Grab ND 12.8 ND 18.6
1 SS-12 0-6"8/4/2022 12:55 Grab ND 12.8 ND 18.6
1 SS-12:12"6-12"8/4/2022 13:00 Grab ND 11 ND 7.3
1 SS-13 0-6"8/4/2022 13:15 Grab ND 12.8 17 18.6
1 SS-14 0-6"8/4/2022 13:30 Grab ND 12.8 18 18.6
1 SS-15 0-6"8/4/2022 13:45 Grab ND 12.8 20 18.6
1 SS-16 0-6"8/4/2022 14:00 Grab ND 12.8 21 18.6
1 SS-16:12"6-12"8/4/2022 14:05 Grab ND 11 ND 7.3
1 SS-17 0-6"8/4/2022 14:20 Grab ND 12.8 8.2 18.6
1 SS-18 0-6"8/4/2022 14:35 Grab ND 12.8 17 18.6
1 SS-19 0-6"8/4/2022 14:50 Grab ND 12.8 13 18.6
1 SS-20 0-6"8/4/2022 15:05 Grab ND 12.8 21 18.6
1 SS-20:12"6-12"8/4/2022 15:10 Grab ND 11 ND 7.3
1 SS-21 0-6"8/4/2022 15:25 Grab ND 12.8 19 18.6
1 SS-22 0-6"8/4/2022 15:40 Grab ND 12.8 6.4 18.6
1 SS-23 0-6"8/4/2022 15:55 Grab ND 12.8 6.7 18.6
1 SS-24 0-6"8/4/2022 16:10 Grab ND 12.8 ND 18.6
1 SS-24:12"6-12"8/4/2022 16:15 Grab ND 11 ND 7.3
1 SS-25 0-6"8/5/2022 8:00 Grab 27 12.8 41 18.6
1 SS-26 0-6"8/5/2022 8:15 Grab 16 12.8 31 18.6
1 SS-27 0-6"8/5/2022 8:30 Grab 13 12.8 23 18.6
1 SS-28 0-6"8/5/2022 8:45 Grab 15 12.8 28 18.6
1 SS-28:12"6-12"8/5/2022 8:50 Grab ND 11 5.7 7.3
1 SS-29 0-6"8/5/2022 9:05 Grab 14 12.8 28 18.6
1 SS-30 0-6"8/5/2022 9:35 Grab 19 12.8 32 18.6
1 SS-31 0-6"8/5/2022 9:50 Grab 21 12.8 40 18.6
1 SS-32 0-6"8/5/2022 10:05 Grab 19 12.8 36 18.6
1 SS-32:12"6-12"8/5/2022 10:10 Grab ND 11 5.6 7.3
1 SS-33 0-6"8/5/2022 10:25 Grab 18 12.8 35 18.6
1 SS-34 0-6"8/5/2022 10:40 Grab 15 12.8 31 18.6
1 SS-35 0-6"8/5/2022 10:55 Grab 14 12.8 27 18.6
1 SS-36 0-6"8/5/2022 11:10 Grab 13 12.8 25 18.6
1 SS-36:12"6-12"8/5/2022 11:25 Grab ND 11 5.6 7.3
1 SS-37 0-6"8/5/2022 11:40 Grab 12 12.8 20 18.6
1 SS-38 0-6"8/5/2022 11:55 Grab 18 12.8 36 18.6
1 SS-39 0-6"8/5/2022 12:10 Grab ND 12.8 5.9 18.6
1 SS-40 0-6"8/5/2022 12:25 Grab ND 12.8 9.1 18.6
1 SS-40:12"6-12"8/5/2022 12:40 Grab ND 11 6 7.3
1 SS-41 0-6"8/5/2022 12:55 Grab ND 12.8 6.3 18.6
1 SS-42 0-6"8/5/2022 13:10 Grab ND 12.8 8.7 18.6
1 SS-43 0-6"8/5/2022 13:25 Grab ND 12.8 8.8 18.6
1 SS-44 0-6"8/5/2022 13:40 Grab ND 12.8 8 18.6
1 SS-44:12"6-12"8/5/2022 13:45 Grab ND 11 10 7.3
1 Duff-1 Duff 8/5/2022 14:05 Grab 16 38
1 Duff-2 Duff 8/5/2022 14:15 Grab 22 38
1 Duff-3 Duff 8/5/2022 14:25 Grab 12 32
1 Duff-4 Duff 8/5/2022 14:35 Grab ND 25
1 Duff-5 Duff 8/5/2022 14:45 Grab ND 19
1 Duff-6 Duff 8/5/2022 14:55 Grab ND 39
1 Duff-7 Duff 8/5/2022 15:05 Grab 24 24
1 Duff-8 Duff 8/5/2022 15:20 Grab Sample 16 44
1 Duff-9 Duff 8/5/2022 15:30 Grab Sample 16 44
1 Duff-10 Duff 8/5/2022 15:40 Grab Sample 19 46
1 Duff-11 Duff 8/5/2022 15:50 Grab Sample 16 46
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
August 16, 2022
Kyler Kelly
Earth Solutions NW, LLC
15365 NE 90th Street, Suite 100
Redmond, WA 98052
Re: Analytical Data for Project ES-8771
Laboratory Reference No. 2208-078
Dear Kyler:
Enclosed are the analytical results and associated quality control data for samples submitted on August 5, 2022.
The standard policy of OnSite Environmental, Inc. is to store your samples for 30 days from the date of receipt. If you
require longer storage, please contact the laboratory.
We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the data,
or need additional information, please feel free to call me.
Sincerely,
David Baumeister
Project Manager
Enclosures
2
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
Case Narrative
Samples were collected on August 4 and 5, 2022 and received by the laboratory on August 5, 2022. They were
maintained at the laboratory at a temperature of 2oC to 6oC.
Please note that any and all soil sample results are reported on a dry-weight basis, unless otherwise noted below.
General QA/QC issues associated with the analytical data enclosed in this laboratory report will be indicated with a
reference to a comment or explanation on the Data Qualifier page. More complex and involved QA/QC issues will be
discussed in detail below.
3
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-1
Laboratory ID: 08-078-01
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 18 5.3 EPA 6010D 8-11-22 8-11-22
Client ID: SS-2
Laboratory ID: 08-078-02
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.3 EPA 6010D 8-11-22 8-11-22
Client ID: SS-3
Laboratory ID: 08-078-03
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 16 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-4
Laboratory ID: 08-078-04
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 19 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-4:12"
Laboratory ID: 08-078-05
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-5
Laboratory ID: 08-078-06
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 18 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-6
Laboratory ID: 08-078-07
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 14 5.5 EPA 6010D 8-11-22 8-11-22
4
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-7
Laboratory ID: 08-078-08
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 18 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-8
Laboratory ID: 08-078-09
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 20 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-8:12"
Laboratory ID: 08-078-10
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 20 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-9
Laboratory ID: 08-078-11
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 15 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-10
Laboratory ID: 08-078-12
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 13 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-11
Laboratory ID: 08-078-13
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-12
Laboratory ID: 08-078-14
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
5
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-12:12"
Laboratory ID: 08-078-15
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-13
Laboratory ID: 08-078-16
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 17 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-14
Laboratory ID: 08-078-17
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 18 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-15
Laboratory ID: 08-078-18
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 20 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-16
Laboratory ID: 08-078-19
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 21 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-16:12"
Laboratory ID: 08-078-20
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-17
Laboratory ID: 08-078-21
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 8.2 5.4 EPA 6010D 8-11-22 8-11-22
6
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-18
Laboratory ID: 08-078-22
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 17 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-19
Laboratory ID: 08-078-23
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 13 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-20
Laboratory ID: 08-078-24
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 21 5.5 EPA 6010D 8-11-22 8-11-22
Client ID: SS-20:12"
Laboratory ID: 08-078-25
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-21
Laboratory ID: 08-078-26
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 19 5.7 EPA 6010D 8-11-22 8-11-22
Client ID: SS-22
Laboratory ID: 08-078-27
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 6.4 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-23
Laboratory ID: 08-078-28
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead 6.7 5.4 EPA 6010D 8-11-22 8-11-22
7
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-24
Laboratory ID: 08-078-29
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-24:12"
Laboratory ID: 08-078-30
Arsenic ND 11 EPA 6010D 8-11-22 8-11-22
Lead ND 5.4 EPA 6010D 8-11-22 8-11-22
Client ID: SS-25
Laboratory ID: 08-078-31
Arsenic 27 11 EPA 6010D 8-11-22 8-11-22
Lead 41 5.6 EPA 6010D 8-11-22 8-11-22
Client ID: SS-26
Laboratory ID: 08-078-32
Arsenic 16 11 EPA 6010D 8-11-22 8-11-22
Lead 31 5.6 EPA 6010D 8-11-22 8-11-22
Client ID: SS-27
Laboratory ID: 08-078-33
Arsenic 13 11 EPA 6010D 8-12-22 8-12-22
Lead 23 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-28
Laboratory ID: 08-078-34
Arsenic 15 11 EPA 6010D 8-12-22 8-12-22
Lead 28 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-28:12"
Laboratory ID: 08-078-35
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 5.7 5.6 EPA 6010D 8-12-22 8-12-22
8
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-29
Laboratory ID: 08-078-36
Arsenic 14 11 EPA 6010D 8-12-22 8-12-22
Lead 28 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-30
Laboratory ID: 08-078-37
Arsenic 19 11 EPA 6010D 8-12-22 8-12-22
Lead 32 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-31
Laboratory ID: 08-078-38
Arsenic 21 11 EPA 6010D 8-12-22 8-12-22
Lead 40 5.5 EPA 6010D 8-12-22 8-12-22
Client ID: SS-32
Laboratory ID: 08-078-39
Arsenic 19 11 EPA 6010D 8-12-22 8-12-22
Lead 36 5.5 EPA 6010D 8-12-22 8-12-22
Client ID: SS-32:12"
Laboratory ID: 08-078-40
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 5.6 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-33
Laboratory ID: 08-078-41
Arsenic 18 11 EPA 6010D 8-12-22 8-12-22
Lead 35 5.5 EPA 6010D 8-12-22 8-12-22
Client ID: SS-34
Laboratory ID: 08-078-42
Arsenic 15 11 EPA 6010D 8-12-22 8-12-22
Lead 31 5.6 EPA 6010D 8-12-22 8-12-22
9
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-35
Laboratory ID: 08-078-43
Arsenic 14 11 EPA 6010D 8-12-22 8-12-22
Lead 27 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-36
Laboratory ID: 08-078-44
Arsenic 13 11 EPA 6010D 8-12-22 8-12-22
Lead 25 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-36:12"
Laboratory ID: 08-078-45
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 5.6 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-37
Laboratory ID: 08-078-46
Arsenic 12 11 EPA 6010D 8-12-22 8-12-22
Lead 20 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-38
Laboratory ID: 08-078-47
Arsenic 18 11 EPA 6010D 8-12-22 8-12-22
Lead 36 5.5 EPA 6010D 8-12-22 8-12-22
Client ID: SS-39
Laboratory ID: 08-078-48
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 5.9 5.5 EPA 6010D 8-12-22 8-12-22
Client ID: SS-40
Laboratory ID: 08-078-49
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 9.1 5.6 EPA 6010D 8-12-22 8-12-22
10
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: SS-40:12"
Laboratory ID: 08-078-50
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 6.0 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-41
Laboratory ID: 08-078-51
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 6.3 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-42
Laboratory ID: 08-078-52
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 8.7 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-43
Laboratory ID: 08-078-53
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 8.8 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-44
Laboratory ID: 08-078-54
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 8.0 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: SS-44:12"
Laboratory ID: 08-078-55
Arsenic ND 11 EPA 6010D 8-12-22 8-12-22
Lead 10 5.6 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-1
Laboratory ID: 08-078-56
Arsenic 16 13 EPA 6010D 8-12-22 8-12-22
Lead 38 6.6 EPA 6010D 8-12-22 8-12-22
11
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Duff-2
Laboratory ID: 08-078-57
Arsenic 22 13 EPA 6010D 8-12-22 8-12-22
Lead 38 6.3 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-3
Laboratory ID: 08-078-58
Arsenic 12 12 EPA 6010D 8-12-22 8-12-22
Lead 32 6.1 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-4
Laboratory ID: 08-078-59
Arsenic ND 12 EPA 6010D 8-12-22 8-12-22
Lead 25 6.0 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-5
Laboratory ID: 08-078-60
Arsenic ND 12 EPA 6010D 8-12-22 8-12-22
Lead 19 6.0 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-6
Laboratory ID: 08-078-61
Arsenic ND 13 EPA 6010D 8-12-22 8-12-22
Lead 39 6.4 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-7
Laboratory ID: 08-078-62
Arsenic 24 12 EPA 6010D 8-12-22 8-12-22
Lead 38 6.0 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-8
Laboratory ID: 08-078-63
Arsenic 16 12 EPA 6010D 8-12-22 8-12-22
Lead 44 6.2 EPA 6010D 8-12-22 8-12-22
12
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
Client ID: Duff-9
Laboratory ID: 08-078-64
Arsenic 16 12 EPA 6010D 8-12-22 8-12-22
Lead 44 6.1 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-10
Laboratory ID: 08-078-65
Arsenic 19 12 EPA 6010D 8-12-22 8-12-22
Lead 46 6.0 EPA 6010D 8-12-22 8-12-22
Client ID: Duff-11
Laboratory ID: 08-078-66
Arsenic 16 12 EPA 6010D 8-12-22 8-12-22
Lead 46 6.2 EPA 6010D 8-12-22 8-12-22
13
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
QUALITY CONTROL
Matrix: Soil
Units: mg/Kg (ppm)
Date Date
Analyte Result PQL Method Prepared Analyzed Flags
METHOD BLANK
Laboratory ID: MB0811SM2
Arsenic ND 10 EPA 6010D 8-11-22 8-11-22
Lead ND 5.0 EPA 6010D 8-11-22 8-11-22
Laboratory ID: MB0811SM4
Arsenic ND 10 EPA 6010D 8-11-22 8-11-22
Lead ND 5.0 EPA 6010D 8-11-22 8-11-22
Laboratory ID: MB0812SM1
Arsenic ND 10 EPA 6010D 8-12-22 8-12-22
Lead ND 5.0 EPA 6010D 8-12-22 8-12-22
Laboratory ID: MB0812SM2
Arsenic ND 10 EPA 6010D 8-12-22 8-12-22
Lead ND 5.0 EPA 6010D 8-12-22 8-12-22
14
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
TOTAL METALS
EPA 6010D
QUALITY CONTROL
Matrix: Soil
Units: mg/Kg (ppm)
Source Percent Recovery RPD
Analyte Result Spike Level Result Recovery Limits RPD Limit Flags
DUPLICATE
Laboratory ID: 08-078-01
ORIG DUP
Arsenic ND ND NA NA NA NA NA 20
Lead 17.4 15.8 NA NA NA NA 10 20
Laboratory ID: 08-078-20
ORIG DUP
Arsenic ND ND NA NA NA NA NA 20
Lead ND ND NA NA NA NA NA 20
Laboratory ID: 08-078-33
ORIG DUP
Arsenic 11.2 13.4 NA NA NA NA 18 20
Lead 20.6 24.5 NA NA NA NA 18 20
Laboratory ID: 08-078-52
ORIG DUP
Arsenic ND ND NA NA NA NA NA 20
Lead 7.80 5.80 NA NA NA NA 29 20
MATRIX SPIKES
Laboratory ID: 08-078-01
MS MSD MS MSD MS MSD
Arsenic 100 102 100 100 ND 100 102 75-125 1 20
Lead 267 271 250 250 17.4 100 102 75-125 2 20
Laboratory ID: 08-078-20
MS MSD MS MSD MS MSD
Arsenic 97.3 93.9 100 100 ND 97 94 75-125 4 20
Lead 262 256 250 250 ND 105 102 75-125 2 20
Laboratory ID: 08-078-33
MS MSD MS MSD MS MSD
Arsenic 108 104 100 100 11.2 97 93 75-125 4 20
Lead 272 272 250 250 20.6 100 101 75-125 0 20
Laboratory ID: 08-078-52
MS MSD MS MSD MS MSD
Arsenic 93.3 91.7 100 100 ND 93 92 75-125 2 20
Lead 246 246 250 250 7.80 95 95 75-125 0 20
15
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
% MOISTURE
Date
Client ID Lab ID % Moisture Analyzed
SS-1 08-078-01 6 8-11-22
SS-2 08-078-02 6 8-11-22
SS-3 08-078-03 7 8-11-22
SS-4 08-078-04 9 8-11-22
SS-4:12" 08-078-05 7 8-11-22
SS-5 08-078-06 7 8-11-22
SS-6 08-078-07 9 8-11-22
SS-7 08-078-08 8 8-11-22
SS-8 08-078-09 8 8-11-22
SS-8:12" 08-078-10 10 8-11-22
SS-9 08-078-11 8 8-11-22
SS-10 08-078-12 9 8-11-22
SS-11 08-078-13 7 8-11-22
SS-12 08-078-14 7 8-11-22
SS-12:12" 08-078-15 7 8-11-22
SS-13 08-078-16 8 8-11-22
SS-14 08-078-17 10 8-11-22
SS-15 08-078-18 8 8-11-22
SS-16 08-078-19 8 8-11-22
SS-16:12" 08-078-20 7 8-11-22
SS-17 08-078-21 7 8-11-22
SS-18 08-078-22 8 8-11-22
SS-19 08-078-23 7 8-11-22
SS-20 08-078-24 9 8-11-22
SS-20:12" 08-078-25 7 8-11-22
SS-21 08-078-26 13 8-11-22
SS-22 08-078-27 7 8-11-22
16
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
% MOISTURE
Date
Client ID Lab ID % Moisture Analyzed
SS-23 08-078-28 7 8-11-22
SS-24 08-078-29 8 8-11-22
SS-24:12" 08-078-30 7 8-11-22
SS-25 08-078-31 11 8-11-22
SS-26 08-078-32 11 8-11-22
SS-27 08-078-33 10 8-11-22
SS-28 08-078-34 11 8-11-22
SS-28:12" 08-078-35 10 8-11-22
SS-29 08-078-36 10 8-11-22
SS-30 08-078-37 11 8-11-22
SS-31 08-078-38 10 8-11-22
SS-32 08-078-39 10 8-11-22
SS-32:12" 08-078-40 10 8-11-22
SS-33 08-078-41 10 8-11-22
SS-34 08-078-42 10 8-11-22
SS-35 08-078-43 10 8-11-22
SS-36 08-078-44 10 8-11-22
SS-36:12" 08-078-45 10 8-11-22
SS-37 08-078-46 11 8-11-22
SS-38 08-078-47 9 8-11-22
SS-39 08-078-48 10 8-11-22
SS-40 08-078-49 10 8-11-22
SS-40:12" 08-078-50 11 8-11-22
SS-41 08-078-51 11 8-11-22
SS-42 08-078-52 11 8-11-22
SS-43 08-078-53 11 8-11-22
SS-44 08-078-54 11 8-11-22
17
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Date of Report: August 16, 2022
Samples Submitted: August 5, 2022
Laboratory Reference: 2208-078
Project: ES-8771
% MOISTURE
Date
Client ID Lab ID % Moisture Analyzed
SS-44:12" 08-078-55 11 8-11-22
Duff-1 08-078-56 25 8-11-22
Duff-2 08-078-57 20 8-11-22
Duff-3 08-078-58 19 8-11-22
Duff-4 08-078-59 17 8-11-22
Duff-5 08-078-60 17 8-11-22
Duff-6 08-078-61 22 8-11-22
Duff-7 08-078-62 16 8-11-22
Duff-8 08-078-63 19 8-11-22
Duff-9 08-078-64 17 8-11-22
Duff-10 08-078-65 17 8-11-22
Duff-11 08-078-66 19 8-11-22
18
OnSite Environmental, Inc. 14648 NE 95th Street, Redmond, WA 98052 (425) 883-3881
This report pertains to the samples analyzed in accordance with the chain of custody,
and is intended only for the use of the individual or company to whom it is addressed.
Data Qualifiers and Abbreviations
A - Due to a high sample concentration, the amount spiked is insufficient for meaningful MS/MSD recovery data.
B - The analyte indicated was also found in the blank sample.
C - The duplicate RPD is outside control limits due to high result variability when analyte concentrations are
within five times the quantitation limit.
E - The value reported exceeds the quantitation range and is an estimate.
F - Surrogate recovery data is not available due to the high concentration of coeluting target compounds.
H - The analyte indicated is a common laboratory solvent and may have been introduced during sample
preparation, and be impacting the sample result.
I - Compound recovery is outside of the control limits.
J - The value reported was below the practical quantitation limit. The value is an estimate.
K - Sample duplicate RPD is outside control limits due to sample inhomogeneity. The sample was
re-extracted and re-analyzed with similar results.
L - The RPD is outside of the control limits.
M - Hydrocarbons in the gasoline range are impacting the diesel range result.
M1 - Hydrocarbons in the gasoline range (toluene-naphthalene) are present in the sample.
N - Hydrocarbons in the lube oil range are impacting the diesel range result.
N1 - Hydrocarbons in diesel range are impacting lube oil range results.
O - Hydrocarbons indicative of heavier fuels are present in the sample and are impacting the gasoline result.
P - The RPD of the detected concentrations between the two columns is greater than 40.
Q - Surrogate recovery is outside of the control limits.
S - Surrogate recovery data is not available due to the necessary dilution of the sample.
T - The sample chromatogram is not similar to a typical ____________.
U - The analyte was analyzed for, but was not detected above the reported sample quantitation limit.
U1 - The practical quantitation limit is elevated due to interferences present in the sample.
V - Matrix Spike/Matrix Spike Duplicate recoveries are outside control limits due to matrix effects.
W - Matrix Spike/Matrix Spike Duplicate RPD are outside control limits due to matrix effects.
X - Sample extract treated with a mercury cleanup procedure.
X1 - Sample extract treated with a sulfuric acid/silica gel cleanup procedure.
X2 - Sample extract treated with a silica gel cleanup procedure.
Y - The calibration verification for this analyte exceeded the 20% drift specified in methods 8260 & 8270, and
therefore the reported result should be considered an estimate. The overall performance of the calibration
verification standard met the acceptance criteria of the method.
Y1 - Negative effects of the matrix from this sample on the instrument caused values for this analyte in the bracketing
continuing calibration verification standard (CCVs) to be outside of 20% acceptance criteria. Because of this,
quantitation limits and sample concentrations should be considered estimates.
Z -
ND - Not Detected at PQL
PQL - Practical Quantitation Limit
RPD - Relative Percent Difference