HomeMy WebLinkAboutPetroleum Tank Release Site File Closure 2011 Minnesota PollutionControl Agency
520 Lafayette Road North I St.Paul,MN 55155-4194 I 651-296-6300 800-657-3864 651-282-5332 TTY www.pcastate.mn.us
I I .pcastate.mn.us
March 21,2011 2011
BY: E.A6
Mr. Kirby Morlock
8941-151St St.
Prior Lake, MN 55372
RE: Petroleum Tank Release Site File Closure
Site: (Former Hotspot Gas,4995—160tt St., Prior Lake,Scott County 55372)
Site ID#: LEAK00018160
Dear Mr. Morlock:
We are pleased to let you know that the Minnesota Pollution Control Agency(MPCA)staff has determined that
your investigation and/or cleanup has adequately addressed the petroleum tank release at the site listed above.
Based on the information provided,the MPCA staff has closed the release site file.
Closure of the file means that the MPCA staff does not require any additional investigation and/or cleanup work
at this time or in the foreseeable future. Please be aware that file closure does not necessarily mean that all
petroleum contamination has been removed from this site. However,the MPCA staff has concluded that any
remaining contamination, if present, does not appear to pose a threat to public health or the environment under
current conditions.
The MPCA reserves the right to reopen this file and to require additional investigation and/or cleanup work if new
information,changing regulatory requirements or changed land use make additional work necessary. If you or
other parties discover additional contamination(either petroleum or nonpetroleum)that was not previously
reported to the MPCA, Minnesota law requires that the MPCA be immediately notified.
You should understand that this letter does not release any party from liability for the petroleum contamination
under Minn.Stat.ch. 115C(2002)or any other applicable state or federal law. In addition,this letter does not
release any party from liability for nonpetroleum contamination, if present, under Minn.Stat.ch. 115B (2002),the
Minnesota Superfund Law.
Please note that as a result of performing the requested work you may be eligible to apply to the Petroleum Tank
Release Compensation Fund (Petrofund)far partial reimbursement of the costs you have incurred in investigating
and cleaning up this petroleum tank release.The Petrofund is administered by the Petroleum Tank Release
Compensation Board (Petro Board)and the Minnesota Department of Commerce.To learn more about who is
eligible for reimbursement,the type of work that is eligible for reimbursement,and the amount of
reimbursement available, please contact Petrofund staff at 651-297-1119 or 1-800-638-0418.
If future development of this property or the surrounding area is planned, it should be assumed that petroleum
contamination may still be present. If petroleum contamination is encountered during future development work,
the MPCA staff should be notified immediately.
Equal Opportunity Employer
Mr. Kirby Morlock
Page 2
March 21,2011
For specific information regarding petroleum contamination that may remain at this leak site,please call the
Petroleum Remediation Program File Request Program at 651-757-2799 or 651-757-2309.The MPCA fact sheet
Request to Bill for Services Performed must be completed prior to arranging a time for file review.
Thank you for your response to this petroleum tank release and for your cooperation with the MPCA to protect
public health and the environment. If you have any questions regarding this letter, please call me at
651-757-2315,or the site hydrogeologist,Mike Connolly, at 651-757-2287.
Sincerely,
/4/,// A
I Pr
Allen Dotson Mike Connolly
Project Manager Hydrogeologist
Petroleum Remediation Section Petroleum Remediation Section
Remediation Division Remediation Division
AD:MC:tf
cc: Kelly Meyer,Asst. Manager, Prior Lake
Doug Hartman, Fire Chief,Prior Lake
Steve Steuber,Scott County Solid Waste Officer
Erik Brenegan,Thatcher Engineering,Minneapolis
Minnesota Department of Commerce Petrofund Staff
Thatcher Engineering,Inc.
. • Thatcher 3055 Old Highway 8,Suite 103
Minneapolis,MN 55418
p612 7812188 f 612 7812241
www.thatcher-eng.com
December 15, 2010
Mr. Allen Dotson—Project Manager
Petroleum Remediation Section
MPCA-Remediation Division
520 Lafayette Road
St. Paul,MN 55155-4194
RE: General Excavation Report Worksheet Guidance Document 3-02 for Former Hot Spot
Gas, Located at 4995— 160th Street,Prior Lake, MN 55372
Leak# 18160
Dear Mr. Dotson:
Enclosed for your review is the General Excavation Report Worksheet Guidance Document 3-02
and related attachments for the above referenced project.
We are recommending site file closure at this site. If you have any questions or comments,
please give me a call at(612) 781-2188.
Sierely,
D1 4? -L__
Dennis P. McComas, P.G.
Vice President
DPM:
Enclosures
Cc: Mr. Kirby Morlock—Prime Site Investments, LLC
•
Minnesota Pollution
ControlAgency
General Excavation Report Worksheet
Guidance Document 3-02
Complete the worksheet below to document excavation and treatment of petroleum contaminated soil
removed prior to a Site Investigation and/or during tank removals and/or upgrades. If soil is excavated
as an MPCA-approved corrective action after a Site Investigation is conducted,complete Guidance
Document 3-02a Corrective Action Excavation Report Worksheet. Conduct excavations in accordance
with Guidance Document 3-01 Excavation of Petroleum Contaminated Soil. Please type or print clearly.
Do not revise or delete text or questions from this report form.
The excavation worksheet 3-02 deadline is 10 months from the date of receipt of the MPCA"Petroleum
Storage Tank Release Investigation and Corrective Action"letter.MPCA staff may establish a shorter
deadline for high priority sites.
PART I: BACKGROUND
A. Site:Former Hot Spot Gas B. Tank Owner/Operator:
MPCA Site ID#: LEAK 18160 Prime Site Investments,LLC
Mailing Address:
Street: 4995 150th St. SE Mr.Kirby Morlock-Partner
City,Zip:Prior Lake,MN Street/Box: 8941 151St Street West
County: Scott City,Zip: Prior Lake, 55372
Site location 44°43' 1.02"N,93°25' 11.13"W Telephone: 612-581-3500
C. Excavating Contractor: D. Consultant: Thatcher Engineering Inc.
Minnesota Petroleum Service, Inc.
Contact: Rick Anderson Contact: Dennis McComas
Telephone: 763-780-5191 Street/Box: 3055 Old Hwy 8 Suite, 103
Tank Contractor Certification Number: 0604 City,Zip: Minneapolis 55418
Telephone: 612-781-2188
E. Others on-site during site work(e.g.,fire marshal, local officials,MPCA staff, etc.):Paul
Baumgartner,Building Inspector,City of Prior Lake;Final Grade Inc.(excavators).
F. Site Location Information:Attach Guidance Document 1-03a Spatial Data Reporting Form if it has
not already been submitted or will not be submitted as part of Guidance Document 4-06 Investigation
Report Form.
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
General Excavation Report Worksheet
Page 2
Note: If person other than tank owner and/or operator is conducting the cleanup,provide name,address,
and relationship to site on a separate attached sheet.
PART II: DATES
A. Date release reported to MPCA: 9-30-10
B. Dates site work performed(tanks removed,piping removed, soil excavation, soil borings, etc.):
Work Performed Date
Two, 10,000-gallon gasoline USTs removed 9-29-10
Release reported 9-30-10
One soil boring completed at the site 11-12-10
PART III: SITE AND RELEASE INFORMATION
A. Describe the land use and pertinent geographic features within 1,000 feet of the site.
(i.e.residential property,industrial,wetlands,etc.)
The area within 1,000 feet of the site is developed with commercial and residential
properties. A vehicle refurbishing shop is located adjoining the site to the south.
B. Provide the following information for all tanks removed and any remaining at the site:
Table 1
Tank Information
Tank UST or Capacity Contents Year
Tank# Material' AST (gallons) (product type) Installed Tank Status2 Tank Condition
001 Steel UST 10,000 Gasoline 1980 Removed Rusted,no visible
(9/29/2010) holes,stained
bottom on north end
002 Steel UST 10,000 Gasoline 1980 Removed Rusted,no visible
(9/29/2010) holes
'"F"for fiberglass or"S"for Steel
2 Indicate:removed(date),abandoned in place(date),or currently in use.
Add additional rows as needed.
Notes:
Piping Material (check all that apply): ® Steel, ❑Fiberglass, ❑Flexible Plastic
C. Describe the location and status of the other components of the tank system(s)(i.e.,transfer
locations,valves,piping and dispensers)for those tanks listed above.
The former tanks were located directly beneath a former canopy and pump islands.
The tanks and dispensers were removed on September 29, 2010.
D. Identify and describe the source(s)or suspected source(s)of the release or contamination
encountered,and how the release or contamination was discovered.
Check all that apply: ®Piping, ®Tank, ❑Dispenser, ❑Pump/Turbine, r Spill/Overfill
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
General Excavation Report Worksheet
Page 3
The source of the release is suspected to be the north tank. The release was
discovered after removal of the tanks.
E. Identify the cause of the release(tank and/or piping).
Check all that apply: ® Corrosion, ❑Loose Component, ❑Puncture,
❑Mechanical or Physical Damage, ❑Unknown
F. Identify the method the release was detected.
Check all that apply: ®Removal, ❑Line Leak Detection, ❑ Tank Leak Detection,
®Visual/Olfactory, ❑ Site Assessment, ❑ Other
G. Identify any surface soil contamination. None
H. What was the volume of the release?(if known): UNKNOWN gallons
I. Historic contamination present(unknown origin?). ❑ Yes, // No
J. When did the release occur?(if known): Unknown
K. Describe source of on-site drinking water.
City Sewer and Water at the site and in the surrounding area
L. Has the site ever,at any point had an E-85 tank?❑Yes,®No
PART IV: EXCAVATION INFORMATION
A. Dimensions of excavation(s): 30 feet by 30 feet,depth of 12 feet
B. Original tank backfill material(sand,gravel,etc.), if applicable: medium sand
C. Native soil type(clay, sand,etc.):
Medium Sand and Gravel underlain by clay at 27 feet (See attached boring log).
D. Quantity of contaminated soil removed for treatment(cubic yards): NONE
(Indicate on the site map where the petroleum contaminated soil was excavated)
How many cubic yards of the removed soil was petroleum saturated? NONE
(Indicate on the site map where the petroleum saturated soil was excavated)
[Note: If the volume removed is more than allowed in Guidance Document 3-01 Excavation of
Petroleum Contaminated Soil,please document MPCA staff approval.]
E. Were new tanks and/or piping and dispensers installed? (NO) If yes,what volume of contaminated
soil was excavated to accommodate the installation of the new tanks and piping?
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
General Excavation Report Worksheet
Page 4
•
•
F. If contaminated soil was removed to accommodate the installation of new tanks and/or piping,show
your calculations for the amount of soil removal allowed using Table 3 in Guidance Document 3-01
Excavation of Petroleum Contaminated Soil.
G. Was ground water encountered or a suspected perched water layer or was there evidence of a
seasonally high ground water table(i.e.mottling)? (yes/no) At what depth?
H. If ground water was not encountered during the excavation,what is the expected depth of ground
water?
According to the geologic atlas, groundwater in the surficial deposits is expected at
80 feet.
I. Additional investigation to determine the need for a Limited Site Investigation is necessary at sites
with sandy or silty sandy soil, a water table within 25 feet of the ground surface,and visual or other
evidence of soil remaining contamination. See Table 2 in Guidance Document 3-01 Excavation of
Petroleum Contaminated Soil. If a soil boring is necessary, describe the soil screening and analytical
results. Attach the boring logs and laboratory results to this report.
Sandy soil with elevated PID readings, petroleum odors, and detected GRO/BTEX
were encountered during the tank removal. One soil boring was completed in the
location of the contaminated soils at the west end of the former north tank, to
assess the potential for vertical migration of contamination. The soil boring was
completed to 20 feet beyond the base of the tank basin. No indications of
contamination were encountered at depth.
J. If no soil boring was performed,explain.
K. If ground water was encountered or if a soil boring was conducted,was there evidence of ground
water contamination? (yes/no) Describe this evidence of contamination,e.g.,free product(specify
thickness),product sheen, ground water in contact with petroleum contaminated soil,water analytical
results, etc. Note: Ifyou observe free product,contact MPCA staff immediately,as outlined in
Guidance Document 2-02 Free Product:Evaluation and Recovery.
NA
L. Was bedrock encountered in the excavation? ( yes/®no) At what depth?
M. Were other unique conditions associated with this site?(Oyes/®no) If so,explain.
PART V: SAMPLING INFORMATION
A. Briefly describe the field screening methods used to distinguish contaminated from uncontaminated
soil:
Soil was placed in a sealed plastic bag and allowed to stand to develop head space,
in accordance with methods and procedures specified in MPCA Guidance
Document 4-04. A Mini-RAE PID was used to measure vapors in all samples.
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
General Excavation Report Worksheet
Page 5 .
B. List soil vapor headspace analysis results collected during excavation of tanks, lines and dispensers,
valves, and transfer locations. (i.e., soils left in place when excavation is complete). Code the
samples with sampling depths in parentheses as follows: sidewall samples S-i (8 feet), S-2(4 feet),
etc.;bottom samples B-1 (13 feet),B-2(14 feet),removed soil R-1 (4 feet),R-1 (8 feet),etc.;
stockpile samples SP-1,etc; line samples L-1,L2, etc.;transfer locations T-1 (4 feet),T-1 (8 feet),
etc.; dispensers D-1 (4 feet), etc. Be sure the sample codes correspond with the site map in part
VI,below.
Sample Soil Reading Sample Soil Reading
Code Type ppm Code Type ppm
B1 (11 Feet) Sand 174 B4 (11 Feet) Sand 0.9
B2 (11 Feet) Sand 35
B3 (11 Feet) Sand 0.7 _
Note: See Figure 6 in the attached LSI report for sample locations.
C. Was the"removed soil"placed back into the excavation basin? (®yes/Ono)
If no,please complete Part VIII: Soil Treatment Information section. If yes,a Limited Site
Investigation is necessary(see Guidance Document 4-01 Soil and Ground Water Assessments
Performed during Site Investigations).
D. Briefly describe the soil analytical sampling and handling procedures used:
Vinyl gloves were used during handling of soils. Approximately 10 grams of soil was
placed in a laboratory jar with preservative for analysis of GRO and BTEX. All jars
are placed in a cooler and chilled to 4 degrees Celsius for transport to the
laboratory.
E. List below all soil sample analytical results from bottom and side wall samples collected after
excavation of tanks,lines and dispensers,valves,and transfer locations(i.e., soils left in place when
excavation is complete). Code the samples with sampling depths in parentheses as follows: sidewall
samples S-1 (8 feet), S-2(4 feet),etc.;bottom samples B-1 (13 feet),B-2 (14 feet),removed soil R-1
(4 feet),R-1 (8 feet),etc.; stockpile samples SP-1,etc; line samples L-1,L2,etc.;transfer locations
T-1 (4 feet),T-1 (8 feet), etc.;dispensers D-1 (4 feet),etc.; Be sure the sample codes correspond
to the site map required in part VI.
Sample GRO Benzene Ethylbenzene Toluene Xylenes
B1 (11 feet) 16.1 <0.058 0.17 0.077 0.36
B2 (11 feet) <5.2 <0.052 <0.052 <0.052 <0.16
B3 (11 feet) <5.3 <0.053 <0.053 <0.053 <0.16
B4 (11 feet) <5.4 <0.054 <0.054 <0.054 <0.16
GP-1 (18-20) <5.3 <0.27 <0.27 <0.27 <0.80
GP-1 (30-32) <5.7 <0.028 <0.028 <0.028 <0.085
Concentrations are in mg/kg.
Note: Attach copies of laboratory reports and chain of custody forms.
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
General Excavation Report Worksheet
Page 6
PART VI: FIGURES
Attach the following figures to this report:
1. Site location map.
2. Site map(s)drawn to scale illustrating the following:
a. Location of all present and former tanks,piping,and dispensers;
b. Location of surface soil contamination
c. Location of other structures(buildings,canopies,etc.);
d. Adjacent city,township, or county roadways;
e. Dimensions of excavation(s), including contour lines(maximum 2-foot contour intervals)to
represent the depths of the final excavation(s);
f. Location of soil screening samples(e.g. R-1), soil analytical samples(e.g., S-1 or B-1), and
any soil borings(e.g., SB-1). Also,attach all boring logs.
g. North arrow, bar scale and map legend.
h. Provide location of any on-site water wells. If on-site water wells exist,please provide well
logs and/or construction diagrams.
i. Locations of new tanks,piping and dispensers, if installed.
PART VII: CONCLUSIONS AND RECOMMENDATIONS
Recommendation for site: site closure
❑additional investigation
Justify the recommendations for the site. If no further action is necessary,the MPCA staff will review
this report following notification of soil treatment.
Sandy soil with elevated PID readings, petroleum odors, and detected GRO/BTEX were
encountered during the tank removal. The sample with the highest contamination detected
during the closure assessment was B-1. The field screening reading at 11 feet was 174 ppm,
the GRO was 16.1 mg/kg and the total BTEX was 0.6 mg/kg.
One soil boring was completed in the location of the highest contamination (B-1) at the west
end of the former north tank, to assess the potential for vertical migration of contamination.
The soil boring was completed to 20 feet beyond the base of the tank basin. No indications of
contamination were encountered at depth. The estimated depth to groundwater, based on the
Scott County Geologic Atlas, is 80 feet from grade. Based on the results of the soil boring
sampling results, no further investigation is recommended for the release, and we recommend
that the site be granted regulatory closure.
PART VIII: SOIL TREATMENT INFORMATION
A. Soil treatment method used(thermal, land application, composting, other). If you choose "other"
specify treatment method:
B. Location of treatment site/facility:
C. Date MPCA approved soil treatment(if thermal treatment was used, indicate date that the MPCA-
permitted thermal treatment facility agreed to accept soil):
D. Identify the location of stockpiled contaminated soil:
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
General Excavation Report Worksheet
Page 7
PART IX: CONSULTANT (OR OTHER)PREPARING THIS REPORT
By signing this document, I/we acknowledge that we are submitting this document on behalf of and as
agents of the responsible person or volunteer for this leak site. I/we acknowledge that if information in
this document is inaccurate or incomplete, it will delay the completion of remediation and may harm the
environment and may result in reduction of reimbursement awards. In addition, I/we acknowledge on
behalf of the responsible person or volunteer for this leak site that if this document is determined to
contain a false material statement, representation, or certification, or if it omits material information,
the responsible person or volunteer may be found to be in violation of Minn. Stat. §115.075(1994)or
Minn. 7000.0300(Duty of Candor), and that the responsible person or volunteer may be liable for civil
penalties.
MPCA staff are instructed to reject unsigned excavation reports or if the report form has
been altered.
Name and Title: Signature: Date signed:
Dennis P. McComas,P.G. [ (iSPOI
Erik A.Brenegan, G.I.T. 1 (1 1216-1 i 0
Company and mailing address:
Thatcher Engineering, c.
3055 Old Highway 8, Suite 103
Minneapolis,MN 55418
Telephone: (612)781-2188 Fax: (612)781-2241
If additional investigation is not necessary,please mail this form and all necessary attachments to the
MPCA project manager. If additional investigation is necessary, include this form as an appendix to
Guidance Document 4-06 Investigation Report Form. MPCA staff will not review excavation reports
indicating a limited site investigation is necessary unless the limited site investigation has been
completed.
Web pages and phone numbers
MPCA staff http://pca.state.mn.us/pca/staff/index.cfm
MPCA toll free 1-800-657-3864
Petroleum Remediation Program web page
http://www.pca.state.mn.us/programs/lust_p.html
MPCA Infor.Request http://www.pca.state.mn.us/about/inforequest.html
MPCA Petroleum Brownfields Program
http://www.pca.state.mn.us/programs/vpic_pltml
PetroFund Web Page http://www.state.mn.us/cgi-bin/portal/mn/jsp/content.do?id=-
536881377&agency=Commerce
PetroFund Phone 651-297-1119,or 1-800-638-0418
State Duty Officer 651-649-5451 or 1-800-422-0798
Upon request,this document can be made available in other formats,including Braille,large print and audio tape. TTY users call 651/282-5332
or 1-800-657-3864(voice/TTY).
Guidance Document c-prp3-02:January 2007
Petroleum Remediation Program
Minnesota Pollution Control Agency
FIGURES
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Site Location:
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'- 4995160th Street SEAilik
Prior Lake MN
tions <___.} 55372
Nil
fSp* a npte i0-eat-c-t
:iLlaliiEvaFio0nri:mer Hot Spot Gas
lylT...h.i.... atdiai
iFIGURE ample LocationandBoringMap2rior Lake, MN
.. � �,rt drawn By Fr46 11/8110
APPENDIX A
SOIL BORING LOG
•Thatcher Soil Boring Log Information
ENGINEERS•SCIENTISTS•ARCHITECTS•PLANNERS
Well Completion Well Usage Scale:
Soil Boring 1"= 8' Page 1 Of 1
Facility/Project Name Project No. Client Boring No. Logged By
Former Hot Spot Gas Kirby Morlock GP-1 EAB
Boring Drilled By(Firm name&name of crew chief) Date Initiated Date Completed Drilling Method
Bergerson Caswell Andy 11/12/10 11/12/10 Push Probe
MN Unique Well No. WI Unique Well No. Common Well Name Final Static Water Level Surface El. Borehole Dia.
GP-1 NA Below Grade 940 Ft MSL 211 Inches
Boring Location T114 N Latitude 44° 431 1.02u REEMeRKSress:
4995 150th St.SE
NE 1/4 of NE I/4 of NE 1/4 of Section 2 R 22 W Longitude 930 251 11.1311 Prior Lake,Minnesota 55372
County City/Township
Scott Prior Lake
c Monitoring Well
v Descricu
ptions 'c a Sample Organic
s Soil/Rock Description and Geologic :i: &Diagram a Vapor
tsOrigin for Each Major Unit ra E covM Bkgnd
C M 0 4 3 # Type Depth ppm ppm
0-2 1 0
•
4 - Asphalt to 4" — 2-4 1 0
Fine to Medium Sand,brown,minor amounts of SP/SM
clay from 4 feet,moist,no odor 4-6 1 0
8 - (Fill) _ 6-8 0.8 0
8-10 0.6 0
12 - Fine to Medium Sand,brown,moist,no odor — _ 10-12 0.5 0
(Native) SP
12-14 0.6 0
16 - 14-16 0.4 0
16-18 0.6 0
20 - Sand and gravel,brown,moist,no odor — SP 18-20 0.7 0
20-22 0.5 0
24 - - 22-24 0.5 0
24-27 0.8 0
28 26-27.5 1.4 0
Grey/Brown sandy Clay till with gravel,firm, a /
moist,no odor 0 28-30 1.1 0
32 - 30-32 0.5 0
End of Boring = 32 Feet
36 - -
40 - -
APPENDIX B
SPACIAL DATA REPORTING FORM
Petroleum Remediation Program
Minnesota Pollution Control Agency
" •" http://www.pca.state.mn.us/programs/lust_p.html
Spatial Data Reporting Form
Guidance Document 1-03a
(For complete instructions, see Guidance Document 1-03.)
Part 1. Background
Has a site location data point been submitted for this site(circle/highlight)? YES or NO
If yes,you do not need to complete Part 2 of this form but should complete Part 3 f there are
additional site features to report. This form can be submitted electronically if desired(e.g., as
an e-mail attachment to the project manager).
MPCA Site ID: LEAK00018160
Site Name: FORMER HOT SPOT GAS
Data Collection Date: 11/5/10
Name of Person Who Collected Data: Erik Brenegan
Organization Name: Thatcher Engineering, Inc.
Organization Type: Engineering/Environmental Consultants
Note:
Part 2. Site Location (use one of the three spatial data reporting formats provided)
Point Description: FORMER TANK BASIN
Collection Method: Interpolation via Google Earth
Datum(circle/highlight): WGS84 NAD83
1) Longitude (dd mm ss.ss 93°25' 11.13"W Latitude(dd mm ss.ss): 44°43' 1.02"N
2)Longitude (dd.dddddd): Latitude (dd.dddddd):
3)UTM- X (Easting): UTM - Y(Northing):
UTM Zone:
Guidance Document c-prp1-03a:April 2005
Petroleum Remediation Program
Minnesota Pollution Control Agency
APPENDIX C
LABORATORY REPORTS
® Pace Analytical Services,Inc.
aceAnalytical 1700 Elm Street-Suite 200
mov.pacelabs. Minneapolis,MN 55414
(612)607-1700
October 11, 2010
Mr. Dennis McComas
Thatcher Engineering
3055 Old Highway 8
Suite 103
Minneapolis, MN 55418
RE: Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
Dear Mr. McComas:
Enclosed are the analytical results for sample(s) received by the laboratory on October 01, 2010.
The results relate only to the samples included in this report. Results reported herein conform to the
most current NELAC standards, where applicable, unless otherwise narrated in the body of the
report.
If you have any questions concerning this report, please feel free to contact me.
Sincerely,
Andrea Opland
andrea.opland@pacelabs.com
Project Manager
Enclosures
REPORT OF LABORATORY ANALYSIS Page 1 of 9
This report shall not be reproduced,except in full,
without the written consent of Pace Analytical Services,Inc..
lifieleli1 of 11
aceAnalytical® Pace Analytical Services,Inc.
1700 Elm Street-Suite 200
wwwpacelabscom Minneapolis,MN 55414 •
(612)607-1700
CERTIFICATIONS
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
Minnesota Certification!Ds
1700 Elm Street SE Suite 200,Minneapolis,MN 55414 Montana Certification#:MT CERT0092
Alaska Certification#:UST-078 Nebraska Certification#:Pace
Alaska Certification#MN00064 Nevada Certification#:MN 00064
Arizona Certification#:AZ-0014 New Jersey Certification#:—MN-002
Arkansas Certification#:88-0680 New Mexico Certification#:Pace
California Certification#:01155CA New York Certification#: 11647
EPA Region 8 Certification#:Pace North Carolina Certification#:530
Florida/NELAP Certification#:E87605 North Dakota Certification#:R-036
Georgia Certification#:959 North Dakota Certification#:R-036A
Idaho Certification#:MN00064 Ohio VAP Certification#:CL101
Illinois Certification#:200011 Oklahoma Certification#:D9921
Iowa Certification#:368 Oklahoma Certification#:9507
Kansas Certification#:E-10167 Oregon Certification#:MN200001
Louisiana Certification#:03086 Pennsylvania Certification#:68-00563
Louisiana Certification#:LA080009 Puerto Rico Certification
Maine Certification#:2007029 Tennessee Certification#:02818
Maryland Certification#:322 Texas Certification#:T104704192
Michigan DEQ Certification#:9909 Washington Certification#:C754
Minnesota Certification#:027-053-137 Wisconsin Certification#:999407970
Mississippi Certification#:Pace
REPORT OF LABORATORY ANALYSIS Page 2 of 9
This report shall not be reproduced,except in full,
without the written consent of Pace Analytical Services,Inc..
`M.« . 2 of 11
/�� 0 Pace Analytical Services,Inc.
7). ace/'/fiU In a' ical 1700 Elm Street-Suite 200
www.paceiabscom Minneapolis,MN 55414
(612)607-1700
SAMPLE SUMMARY
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
Lab ID Sample ID Matrix Date Collected Date Received
10139497001 B-1 Solid 09/29/10 00:00 10/01/10 13:06
10139497002 B-2 Solid 09/29/10 00:00 10/01/10 13:06
10139497003 B-3 Solid 09/29/10 00:00 10/01/10 13:06
10139497004 8-4 Solid 09/29/10 00:00 10/01/10 13:06
10139497005 Trip Blank Solid 10/01/10 13:06
REPORT OF LABORATORY ANALYSIS Page 3 of 9
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without the written consent of Pace Analytical Services,Inc..
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aceAnalytical 1700 Elm Street-Suite 200
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(612)607-1700
SAMPLE ANALYTE COUNT
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
Analytes
Lab ID Sample ID Method Analysts Reported
10139497001 B-1 WI MOD GRO MJH 6
%Moisture JDL 1
10139497002 B-2 WI MOD GRO MJH 6
%Moisture JDL 1
10139497003 B-3 WI MOD GRO MJH 6
%Moisture JDL 1
10139497004 B-4 WI MOD GRO MJH 6
%Moisture JDL 1
10139497005 Trip Blank WI MOD GRO MJH 6
REPORT OF LABORATORY ANALYSIS Page 4 of 9
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ANALYTICAL RESULTS
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
Sample: B-1 Lab ID: 10139497001 Collected: 09/29/10 00:00 Received: 10/01/10 13:06 Matrix: Solid
Results reported on a"dry-weight"basis
Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual
WIGRO GCV Analytical Method:WI MOD GRO Preparation Method:TPH GRO/PVOC WI ext.
Benzene ND mg/kg 0.058 1 10/04/10 14:53 10/05/10 15:53 71-43-2
Ethylbenzene 0.17 mg/kg 0.058 1 10/04/10 14:53 10/05/10 15:53 100-41-4
Gasoline Range Organics 16.1 mg/kg 5.8 1 10/04/10 14:53 10/05/10 15:53
Toluene 0.077 mg/kg 0.058 1 10/04/10 14:53 10/05/10 15:53 108-88-3
Xylene(Total) 0.36 mg/kg 0.17 1 10/04/10 14:53 10/05/10 15:53 1330-20-7
a,a,a-Trifluorotoluene(S) 97 % 80-125 1 10/04/10 14:53 10/05/10 15:53 98-08-8
Dry Weight Analytical Method:%Moisture
Percent Moisture 16.4 % 0.10 1 10/08/10 00:00
•
Sample: B-2 Lab ID: 10139497002 Collected: 09/29/10 00:00 Received: 10/01/10 13:06 Matrix: Solid
Results reported on a"dry-weight"basis
Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual
WIGRO GCV Analytical Method:WI MOD GRO Preparation Method:TPH GRO/PVOC WI ext.
Benzene ND mg/kg 0.052 1 10/04/10 14:53 10/05/10 00:40 71-43-2
Ethylbenzene ND mg/kg 0.052 1 10/04/10 14:53 10/05/10 00:40 100-41-4
Gasoline Range Organics ND mg/kg 5.2 1 10/04/10 14:53 10/05/10 00:40
Toluene ND mg/kg 0.052 1 10/04/10 14:53 10/05/10 00:40 108-88-3
Xylene(Total) ND mg/kg 0.16 1 10/04/10 14:53 10/05/10 00:40 1330-20-7
a,a,a-Trifluorotoluene(S) 104 % 80-125 1 10/04/10 14:53 10/05/10 00:40 98-08-8
Dry Weight Analytical Method:%Moisture
Percent Moisture 5.7 % 0.10 1 10/08/10 00:00
Sample: B-3 Lab ID: 10139497003 Collected: 09/29/10 00:00 Received: 10/01/10 13:06 Matrix:Solid
Results reported on a"dry-weight"basis
Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual
WIGRO GCV Analytical Method:WI MOD GRO Preparation Method:TPH GRO/PVOC WI ext.
Benzene ND mg/kg 0.053 1 10/04/10 14:53 10/05/10 01:03 71-43-2
Ethylbenzene ND mg/kg 0.053 1 10/04/10 14:53 10/05/10 01:03 100-41-4
Gasoline Range Organics ND mg/kg 5.3 1 10/04/10 14:53 10/05/10 01:03
Toluene ND mg/kg 0.053 1 10/04/10 14:53 10/05/10 01:03 108-88-3
Xylene(Total) ND mg/kg 0.16 1 10/04/10 14:53 10/05/10 01:03 1330-20-7
a,a,a-Trifluorotoluene(S) 100 % 80-125 1 10/04/10 14:53 10/05/10 01:03 98-08-8
Dry Weight Analytical Method:%Moisture
Percent Moisture 3.5 % 0.10 1 10/08/10 00:00
Date:10/11/2010 04:43 PM REPORT OF LABORATORY ANALYSIS Page 5 of 9
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CCpyo
•
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®(4
Pace Analytical Services,Inc.
aceAnalyticai 1700 Elm Street-Suite 200
Hww.peceiah��m • Minneapolis,MN 55414
(612)607-1700
ANALYTICAL RESULTS
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
Sample: B-4 Lab ID: 10139497004 Collected: 09/29/10 00:00 Received: 10/01/10 13:06 Matrix: Solid
Results reported on a"dry-weight"basis
Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual
WIGRO GCV Analytical Method:WI MOD GRO Preparation Method:TPH GRO/PVOC WI ext.
Benzene ND mg/kg 0.054 1 10/04/10 14:53 10/05/10 01:27 71-43-2
Ethylbenzene ND mg/kg 0.054 1 10/04/10 14:53 10/05/10 01:27 100-41-4
Gasoline Range Organics ND mg/kg 5.4 1 10/04/10 14:53 10/05/10 01:27
Toluene ND mg/kg 0.054 1 10/04/10 14:53 10/05/10 01:27 108-88-3
Xylene(Total) ND mg/kg 0.16 1 10/04/10 14:53 10/05/10 01:27 1330-20-7
a,a,a-Trifluorotoluene(S) 100 % 80-125 1 10/04/10 14:53 10/05/10 01:27 98-08-8
Dry Weight Analytical Method:%Moisture
Percent Moisture 3.2 % 0.10 1 10/08/10 00:00
Sample: Trip Blank Lab ID: 10139497005 Collected: Received: 10/01/10 13:06 Matrix: Solid
Results reported on a"wet-weight"basis
Parameters Results Units Report Limit DF Prepared Analyzed CAS No. Qual
WIGRO GCV Analytical Method:WI MOD GRO Preparation Method:TPH GRO/PVOC WI ext.
Benzene ND mg/kg 0.050 1 10/04/10 14:53 10/04/10 18:22 71-43-2
Ethylbenzene ND mg/kg 0.050 1 10/04/10 14:53 10/04/10 18:22 100-41-4
Gasoline Range Organics ND mg/kg 5.0 1 10/04/10 14:53 10/04/10 18:22
Toluene ND mg/kg 0.050 1 10/04/10 14:53 10/04/10 18:22 108-88-3
Xylene(Total) ND mg/kg 0.15 1 10/04/10 14:53 10/04/10 18:22 1330-20-7
a,a,a-Trifluorotoluene(S) 102 % 80-125 1 10/04/10 14:53 10/04/10 18:22 98-08-8
Date:10/11/2010 04:43 PM REPORT OF LABORATORY ANALYSIS Page 6 of 9
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without the written consent of Pace Analytical Services,Inc..
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QUALITY CONTROL DATA
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
QC Batch: GCV/7455 Analysis Method: WI MOD GRO
QC Batch Method: TPH GRO/PVOC WI ext. Analysis Description: WIGRO Solid GCV
Associated Lab Samples: 10139497001,10139497002,10139497003,10139497004,10139497005
METHOD BLANK: 864997 Matrix: Solid
Associated Lab Samples: 10139497001,10139497002,10139497003,10139497004,10139497005
Blank Reporting
Parameter Units Result Limit Analyzed Qualifiers
Benzene mg/kg ND 0.050 10/04/10 17:35
Ethylbenzene mg/kg ND 0.050 10/04/10 17:35
Gasoline Range Organics mg/kg ND 5.0 10/04/10 17:35
Toluene mg/kg ND 0.050 10/04/10 17:35
Xylene(Total) mg/kg ND 0.15 10/04/10 17:35
a,a,a-Trifluorotoluene(S) % 99 80-125 10/04/10 17:35
LABORATORY CONTROL SAMPLE&LCSD: 864998 864999
Spike LCS LCSD LCS LCSD %Rec Max
Parameter Units Conc. Result Result %Rec %Rec Limits RPD RPD Qualifiers
Benzene mg/kg 5 5.6 5.2 112 104 80-120 7 20
Ethylbenzene mg/kg 5 5.7 5.3 114 107 80-120 7 20
Gasoline Range Organics mg/kg 50 59.6 51.6 119 103 80-120 14 20
Toluene mg/kg 5 5.5 5.1 109 102 80-120 7 20
Xylene(Total) mg/kg 15 17.0 16.0 114 107 80-120 6 20
a,a,a-Trifluorotoluene(S) % 94 101 80-125
Date:10/11/2010 04:43 PM REPORT OF LABORATORY ANALYSIS Page 7 of 9
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without the written consent ofd Pace Analytical Services,Inc..
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e Pace Analytical Services,Inc.
aeAnaijitiCai 1700 Elm Street-Suite 200
Iwww.paietabs.com • Minneapolis,MN 55414
I (612)607-1700
QUALITY CONTROL DATA
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
QC Batch: MPRP/22782 Analysis Method: %Moisture
QC Batch Method: %Moisture Analysis Description: Dry Weight/Percent Moisture
Associated Lab Samples: 10139497001,10139497002,10139497003,10139497004
SAMPLE DUPLICATE: 868198
10139497001 Dup Max
Parameter Units Result Result RPD RPD Qualifiers
Percent Moisture % 16.4 15.7 4 30
SAMPLE DUPLICATE: 868199
10138496001 Dup Max
Parameter Units Result Result RPD RPD Qualifiers
Percent Moisture % 20.9 22.2 6 30
•
Date:10/11/2010 04:43 PM REPORT OF LABORATORY ANALYSIS Page 8 of 9
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Pace Analytical Services,Inc.
_ aceAnalytical g 1700 Elm Street-Suite 200
wwwpece(abs.corn Minneapolis,MN 55414
(612)607-1700
QUALIFIERS
Project: Hot Spot Gas Prior Lake
Pace Project No.: 10139497
DEFINITIONS
DF-Dilution Factor,if reported,represents the factor applied to the reported data due to changes in sample preparation,dilution of
the sample aliquot,or moisture content.
ND-Not Detected at or above adjusted reporting limit.
J-Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit.
MDL-Adjusted Method Detection Limit.
S-Surrogate
1,2-Diphenylhydrazine(8270 listed analyte)decomposes to Azobenzene.
Consistent with EPA guidelines,unrounded data are displayed and have been used to calculate%recovery and RPD values.
LCS(D)-Laboratory Control Sample(Duplicate)
MS(D)-Matrix Spike(Duplicate)
DUP-Sample Duplicate
RPD-Relative Percent Difference
NC-Not Calculable.
U-Indicates the compound was analyzed for,but not detected.
N-Nitrosodiphenylamine decomposes and cannot be separated from Diphenylamine using Method 8270. The result reported for
each analyte is a combined concentration.
Pace Analytical is NELAP accredited.Contact your Pace PM for the current list of accredited analytes.
Date:10/11/2010 04:43 PM REPORT OF LABORATORY ANALYSIS Page 9 of 9
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LEGEND
88 Empire Drive
St Paul,MN 55103
Technical Services, Inc Tel: 651-642-1150
Fax: 651-642-1239
www . legend - group . com
November 30,2010
Mr.Dennis McComas
Thatcher Engineering Inc.
3055 Old Hwy 8, Suite 103
Minneapolis,MN 55418
Work Order Number: 1004692
RE: Prior Lake
Enclosed are the results of analyses for samples received by the laboratory on 11/12/10. If you have any questions concerning
this report,please feel free to contact me.
All samples will be retained by LEGEND, unless consumed in the analysis,for 30 days from the date of this report and then
discarded unless other arrangements are made.
MDH Certification#027-123-295
Prepared by,
LEGEND TECHNICAL SERVICES, INC
' '�► Ci
Bach Pham Terri Olson
Client Manager I Report Reviewer
bpham@legend-group.com tolson@legend-group.com
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced in
its entirety.
LEGEND
88 Empire Drive
St Paul,MN 55103
Technical Services, Inc. Tel: 651-642-1150
Fax: 651-642-1239
www . i e a o n d - group . corn
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
ANALYTICAL REPORT FOR SAMPLES
Sample ID Laboratory ID Matrix Date Sampled Date Received
GP-1 18-20 1004692-01 Soil 11/12/10 00:00 11/12/10 14:15
GP-1 30-32 1004692-02 Soil 11/12/10 00:00 11/12/10 14:15
Trip Blank 1004692-03 Methanol 11/12/10 00:00 11/12/10 14:15
Shipping Container Information
Default Cooler Temperature(°C): 2.3
Received on ice:Yes Temperature blank was present Received on ice pack:No
Received on melt water:No Ambient: No Acceptable(IH/ISO only): No
Custody seals:No
Case Narrative:
MN Certification does not apply to dichlorofluoromethane,tetrahydrofuran,and 1,1,2-trichlorotrifluoroethane in the 8260B analysis.
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 2 of 16
LEGEND 88 Empire Drive
St Paul,MN 55103
Technical Services, Inc. Tel: 651-642-1150
Fax: 651-642-1239
www . l e g e n d - g r o up . c o r n
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
WI(95)GRO/8015B
Legend Technical Services, Inc.
Analyte Result RL MDL Units Dilution Batch Prepared Analyzed Method Notes
GP-1 18-20(1004692-01)Soil Sampled:11/12/10 00:00 Received:11/12/10 14:15
Gasoline range organics <5.3 5.3 0.27 mg/kg dry 1 B0K1704 11/17/10 11/17/10 Wl(95)GRO
Surrogate:4-Fluorochlorobenzene 103 80-150 % "
GP-1 30-32(1004692-02)Soil Sampled:11/12/10 00:00 Received: 11/12/10 14:15
Benzene <0.028 0.028 0.0043 mg/kg dry 1 B0K1704 11/17/10 11/17/10 WI(95)GRO
Ethylbenzene <0.028 0.028 0.0053 mg/kg dry 1 "
Gasoline range organics <5.7 5.7 0.28 mg/kg dry 1 " "
Toluene <0.028 0.028 0.0027 mg/kg dry 1 " " "
Xylenes(total) <0.085 0.085 0.014 mg/kg dry 1 "
Surrogate:4-Fluorochlorobenzene 109 80-150 % " " ^ "
Trip Blank(1004692-03)Methanol Sampled:11/12/10 00:00 Received:11/12/1014:15
Benzene <0.025 0.025 0.0038 mg/kg wet 1 B0K1704 11/17/10 11/17/10 WI(95)GRO
Ethylbenzene <0.025 0.025 0.0047 mg/kg wet 1 "
Gasoline range organics <5.0 5.0 0.25 mg/kg wet 1 " " "
Toluene <0.025 0.025 0.0024 mg/kg wet 1 " " " "
Xylenes(total) <0.075 0.075 0.012 mg/kg wet 1 " " "
Surrogate:4-Fluorochlorobenzene 105 80-150 % "
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 3 of 16
ILEGEND 88 Empire Drive
St Paul,MN 55103
Technical Services, Inc Tel: 651-642-1150
Fax: 651-642-1239
www . i eg o n ;! - g r o u p corn
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
PERCENT SOLIDS
Legend Technical Services, Inc.
Analyte Result RL MDL Units Dilution Batch Prepared Analyzed Method Notes
GP-1 18-20(1004692-01)Soil Sampled:11/12/10 00:00 Received:11/12/10 14:15
%Solids 94 % 1 BOK1913 11/19/10 11/22/10 %calculation
GP-1 30-32(1004692-02)Soil Sampled:11/12/10 00:00 Received:11/12/10 14:15
%Solids 88 % 1 B0K1913 11/19/10 11/22/10 %calculation
•
Legend Technical Services, Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 4 of 16
88 Empire Drive
St Paul,MN 55103
LEGEND
Technical Services, Inc. Tel: 651-642-1150
Fax: 651-642-1239
www . iegend - group . com
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B
Legend Technical Services,Inc.
Analyte Result RL MDL Units Dilution Batch Prepared Analyzed Method Notes
GP-1 18-20(1004692-01)Soil Sampled:11/12/10 00:00 Received:11/12110 14:15
1,1,1,2-Tetrachloroethane <0.27 0.27 0.063 mg/kg dry 1 B0K1605 11/16/10 11/16/10 EPA8260B
1,1,1-Trichloroethane <0.27 0.27 0.034 mg/kg dry 1 "
1,1,2,2-Tetrachloroethane <0.27 0.27 0.028 mg/kg dry 1 "
1,1,2-Trichloroethane <0.27 0.27 0.036 mg/kg dry 1 " "
1,1,2-Trichlorotrifluoroethane <0.27 0.27 0.072 mg/kg dry 1 " "
1,1-Dichloroethane <0.27 0.27 0.024 mg/kg dry 1 " " " "
1,1-Dichloroethene <0.27 0.27 0.027 mg/kg dry 1 " "
1,1-Dichloropropene <0.27 0.27 0.022 mg/kg dry 1 "
1,2,3-Trichlorobenzene <0.53 0.53 0.065 mg/kg dry 1 "
1,2,3-Trichloropropane <0.27 0.27 0.026 mg/kg dry 1 " " "
1,2,4-Trichlorobenzene <0.53 0.53 0.029 mg/kg dry 1 " " " "
1,2,4-Trimethylbenzene <0.27 0.27 0.019 mg/kg dry 1 " " "
1,2-Dibromo-3-chloropropane <0.53 0.53 0.073 mg/kg dry 1 " "
1,2-Dibromoethane(EDB) <0.27 0.27 0.023 mg/kg dry 1 " " " "
1,2-Dichlorobenzene <0.27 0.27 0.021 mg/kg dry 1 "
1,2-Dichloroethane <0.27 0.27 0.029 mg/kg dry 1 " " " "
1,2-Dichloropropane <0.27 0.27 0.033 mg/kg dry 1 " " "
1,3,5-Trimethylbenzene <0.27 0.27 0.021 mg/kg dry 1 " "
1,3-Dichlorobenzene <0.27 0.27 0.028 mg/kg dry 1 " " "
1,3-Dichloropropane <0.27 0.27 0.023 mg/kg dry 1 "
1,4-Dichlorobenzene <0.27 0.27 0.018 mg/kg dry 1 " "
2,2-Dichloropropane <0.53 0.53 0.064 mg/kg dry 1 " "
2-Butanone <2.1 2.1 0.094 mg/kg dry 1 " " " "
2-Chlorotoluene <0.27 0.27 0.015 mg/kg dry 1 " " "
4-Chlorotoluene <0.27 0.27 0.022 mg/kg dry 1 " " "
Acetone <2.1 2.1 0.20 mg/kg dry 1 " " "
Allyl chloride <0.53 0.53 0.062 mg/kg dry 1 " "
Benzene <0.27 0.27 0.016 mg/kg dry 1 " " "
Bromobenzene <0.27 0.27 0.029 mg/kg dry 1 " " "
Bromochloromethane <0.27 0.27 0.039 mg/kg dry 1 "
Bromodichloromethane <0.27 0.27 0.029 mg/kg dry 1 0 " " "
Bromoform <0.53 0.53 0.029 mg/kg dry 1 0 " "
Bromomethane <0.53 0.53 0.12 mg/kg dry 1 " " "
Carbon tetrachloride <0.27 0.27 0.036 mg/kg dry 1 " " "
Chlorobenzene <0.27 0.27 0.020 mg/kg dry 1 " " " "
Chloroethane <0.27 0.27 0.039 mg/kg dry 1 " " " "
Chloroform <0.27 0.27 0.022 mg/kg dry 1 " " "
Chloromethane <0.27 0.27 0.065 mg/kg dry 1 " " " "
cis-1,2-Dichloroethene <0.27 0.27 0.028 mg/kg dry 1 " "
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 5 of 16
LEGEND 88 Empire Drive
St Paul,MN 55103
Technical Services, hiC. Tel: 651-642-1150
Fax: 651-642-1239
w ww . € e g ea n d - g r o u p . ,c o m
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B
Legend Technical Services, Inc.
Analyte Result RL MDL Units Dilution Batch Prepared Analyzed Method Notes
GP-1 18-20(1004692-01)Soil Sampled:11/12/10 00:00 Received:11/12/10 14:15
cis-1,3-Dichloropropene <0.27 0.27 0.023 mg/kg dry 1 B0K1605 11/16/10 11/16/10 EPA 8260B
Dibromochloromethane <0.27 0.27 0.036 mg/kg dry 1 " "
Dibromomethane <0.27 0.27 0.031 mg/kg dry 1 " "
Dichlorodifluoromethane <0.53 0.53 0.11 mg/kg dry 1 "
Dichlorofluoromethane <0.27 0.27 0.040 mg/kg dry 1 " "
Ethyl ether <0.53 0.53 0.040 mg/kg dry 1 "
Ethylbenzene <0.27 0.27 0.012 mg/kg dry 1 " " "
Hexachlorobutadiene <1.1 1.1 0.073 mg/kg dry 1 " "
Isopropylbenzene <0.27 0.27 0.020 mg/kg dry 1 " " " "
m,p-Xylene <0.53 0.53 0.050 mg/kg dry 1 " " "
Methyl isobutyl ketone <0.53 0.53 0.087 mg/kg dry 1 " " li
Methyl tert-butyl ether <0.27 0.27 0.017 mg/kg dry 1 " " "
Methylene chloride <1.1 1.1 0.062 mg/kg dry 1 " "
Naphthalene <0.53 0.53 0.059 mg/kg dry 1 " "
n-Butylbenzene <0.27 0.27 0.029 mg/kg dry 1 " "
n-Propylbenzene <0.27 0.27 0.022 mg/kg dry 1 " "
o-Xylene <0.27 0.27 0.027 mg/kg dry 1 " " "
p-Isopropyltoluene <0.27 0.27 0.015 mg/kg dry 1 "
sec-Butylbenzene <0.27 0.27 0.018 mg/kg dry 1 " "
Styrene <0.27 0.27 0.021 mg/kg dry 1 " " "
tert-Butylbenzene <0.27 0.27 0.019 mg/kg dry 1 "
Tetrachloroethene <0.27 0.27 0.030 mg/kg dry 1 " "
Tetrahydrofuran <2.1 2.1 0.13 mg/kg dry 1 " "
Toluene <0.27 0.27 0.017 mg/kg dry 1 " " "
trans-1,2-Dichloroethene <0.27 0.27 0.032 mg/kg dry 1 " " "
trans-1,3-Dichloropropene <0.27 0.27 0.024 mg/kg dry1 " " "
Trichloroethene <0.27 0.27 0.044 mg/kg dry 1 " " "
Trichlorofluoromethane <0.27 0.27 0.037 mg/kg dry 1 " "
Vinyl chloride <0.27 0.27 0.069 mg/kg dry 1 " " "
Surrogate:4-Bromofluorobenzene 107 80-124 % " "
Surrogate:Dibromofluoromethane 105 77.1-123 % " "
Surrogate:Toluene-d8 107 78.1-125 % " "
Trip Blank(1004692-03)Methanol Sampled:11/12/10 00:00 Received:11/12/10 14:15
1,1,1,2-Tetrachloroethane <0.25 0.25 0.059 mg/kg wet 1 B0K1605 11/16/10 11/16/10 EPA 8260B
1,1,1-Trichloroethane <0.25 0.25 0.032 mg/kg wet 1 " " "
1,1,2,2-Tetrachloroethane <0.25 0.25 0.026 mg/kg wet 1 " "
1,1,2-Trichloroethane <0.25 0.25 0.034 mg/kg wet 1 " "
1,1,2-Trichlorotrifluoroethane <0.25 0.25 0.068 mg/kg wet 1 " "
1,1-Dichloroethane <0.25 0.25 0.023 mg/kg wet 1 " " "
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 6 of 16
88 Empire Drive
ILEGEND St Paul,MN 55103
Technical Services, inc. Tel: 651-642-1150
Fax: 651-642-1239
www . legend - group . com
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B
Legend Technical Services, Inc.
Analyte Result RL MDL Units Dilution Batch Prepared Analyzed Method Notes
Trip Blank(1004692-03)Methanol Sampled:11/12/10 00:00 Received:11/12/10 14:15
1,1-Dichloroethene <0.25 0.25 0.025 mg/kg wet 1 B0K1605 11/16/10 11/16/10 EPA 8260B
1,1-Dichloropropene <0.25 0.25 0.021 mg/kg wet 1
1,2,3-Trichlorobenzene <0.50 0.50 0.061 mg/kg wet 1 "
1,2,3-Trichloropropane <0.25 0.25 0.024 mg/kg wet 1 "
1,2,4-Trichlorobenzene <0.50 0.50 0.027 mg/kg wet 1 "
1,2,4-Trimethylbenzene <0.25 0.25 0.018 mg/kg wet 1 " "
1,2-Dibromo-3-chloropropane <0.50 0.50 0.069 mg/kg wet 1 "
1,2-Dibromoethane(EDB) <0.25 0.25 0.022 mg/kg wet 1 " "
1,2-Dichlorobenzene <0.25 0.25 0.020 mg/kg wet 1 " "
1,2-Dichloroethane <0.25 0.25 0.027 mg/kg wet 1 " " "
1,2-Dichloropropane <0.25 0.25 0.031 mg/kg wet 1 " " "
1,3,5-Trimethylbenzene <0.25 0.25 0.020 mg/kg wet 1 " " "
1,3-Dichlorobenzene <0.25 0.25 0.026 mg/kg wet 1 " "
1,3-Dichloropropane <0.25 0.25 0.022 mg/kg wet 1 " " " "
1,4-Dichlorobenzene <0.25 0.25 0.017 mg/kg wet 1 " "
2,2-Dichloropropane <0.50 0.50 0.060 mg/kg wet 1 " "
2-Butanone <2.0 2.0 0.088 mg/kg wet 1 " " "
2-Chlorotoluene <0.25 0.25 0.014 mg/kg wet 1 " " " "
4-Chlorotoluene <0.25 0.25 0.021 mg/kg wet 1 ..
Acetone <2.0 2.0 0.19 mg/kg wet 1 " "
Ally!chloride <0.50 0.50 0.058 mg/kg wet 1 " "
Benzene <0.25 0.25 0.015 mg/kg wet 1 " "
Bromobenzene <0.25 0.25 0.027 mg/kg wet 1 "
Bromochloromethane <0.25 0.25 0.037 mg/kg wet 1 " "
Bromodichloromethane <0.25 0.25 0.027 mg/kg wet 1 "
Bromoform <0.50 0.50 0.027 mg/kg wet 1 "
Bromomethane <0.50 0.50 0.11 mg/kg wet 1 " "
Carbon tetrachloride <0.25 0.25 0.034 mg/kg wet 1 ,,
Chlorobenzene <0.25 0.25 0.019 mg/kg wet 1 "
Chloroethane <0.25 0.25 0.037 mg/kg wet 1 "
Chloroform <0.25 0.25 0.021 mg/kg wet 1 " ,.
Chloromethane <0.25 0.25 0.061 mg/kg wet 1 ., .,
cis-1,2-Dichloroethene <0.25 0.25 0.026 mg/kg wet 1 " " "
cis-1,3-Dichloropropene <0.25 0.25 0.022 mg/kg wet 1 " "
Dibromochloromethane <0.25 0.25 0.034 mg/kg wet 1 " "
Dibromomethane <0.25 0.25 0.029 mg/kg wet 1 "
Dichlorodifluoromethane <0.50 0.50 0.099 mg/kg wet 1 " "
Dichlorofluoromethane <0.25 0.25 0.038 mg/kg wet 1 " ..
Ethyl ether <0.50 0.50 0.038 mg/kg wet 1 " " "
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 7 of 16
ILEGEND
88 Empire Drive
ical In
St Paul,MN 55103
Tel: 651-642-1150
W =ovw . Iegend - group _ corr1 Fax: 651-642-1239
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none]
Minneapolis,MN 55418 Work Order#: 1004692
Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B
Legend Technical Services, Inc.
(Analyte Result RL MDL Units Dilution Batch Prepared Analyzed Method Notes
Trip Blank(1004692-03)Methanol Sampled:11/12/10 00:00 Received:11/12/10 14:15
I
Ethylbenzene <0.25 0.25 0.011 mg/kg wet 1 B0K1605 11/16/10 11/16/10 EPA 82608
Hexachlorobutadiene <1.0 1.0 0.069 mg/kg wet 1 " » „
Isopropylbenzene <0.25 0.25 0.019 mg/kg wet 1 » ,,
"
m,p-Xylene <0.50 0.50 0.047 mg/kg wet 1 " »
„
Methyl isobutyl ketone <0.50 0.50 0.082 mg/kg wet 1 ^ „
»
Methyl tert-butyl ether <0.25 0.25 0.016 mg/kg wet 1 " " »
»
Methylene chloride <1.0 1.0 0.058 mg/kg wet 1 ^ „
Naphthalene <0.50 0.50 0.055 mg/kg wet 1 " ^ "
n-Butylbenzene <0.25 0.25 0.027 mg/kg wet 1 » » „
n-Propylbenzene <0.25 0.25 0.021 mg/kg wet 1 " » » "
o-Xylene <0.25 0.25 0.025 mg/kg wet 1 " ^ „ „
p-Isopropyltoluene <0.25 0.25 0.014 mg/kg wet 1 ^ ^ »
sec-Butylbenzene <0.25 0.25 0.017 mg/kg wet 1 ^ „
»
Styrene <0.25 0.25 0.020 mg/kg wet 1 " ^ »
tert-Butylbenzene <0.25 0.25 0.018 mg/kg wet 1 ^ "
Tetrachloroethene <0.25 0.25 0.028 mg/kg wet 1 " „
Tetrahydrofuran <2.0 2.0 0.12 mg/kg wet 1 » „
^
Toluene <0.25 0.25 0.016 mg/kg wet 1 ^ »
trans-1,2-Dichloroethene <0.25 0.25 0.030 mg/kg wet 1 " „
trans-1,3-Dichloropropene <0.25 0.25 0.023 mg/kg wet 1 " „
Trichloroethene <0.25 0.25 0.041 mg/kg wet 1 ^ » „
„
Trichlorofluoromethane <0.25 0.25 0.035 mg/kg wet 1 ^ ^ »
Vinyl chloride <0.25 0.25 0.065 mg/kg wet 1 " ^ „ »
Surrogate:4-Bromofluorobenzene 105
80-124 % ^
Surrogate:Dibromofluoromethane 107 " » „
77.1-123 % »
Surrogate:Toluene-d8 107 „ » „
78.1-125 % ^ » " »
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 8 of 16
ILEGEND
88tt PEmpire Drive
Technical Services, Inc. Tel: 651-642-1150
Fax:
55103
Tel: 651-642-1150
w ,✓ . i e Fax: 651-642-1239
ee n ci - g r o u p corn
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none]
Minneapolis,MN 55418 Work Order#: 1004692
Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
WI(95)GRO/8015B -Quality Control
Legend Technical Services,Inc.
(Analyte Spike Source %REC %RPD
Result RL MDL Units Level Result %REC Limits %RPD Limit Notes I
Batch B0K1704-EPA 5035 Soil(Purge and Trap)
Blank(BOK1704-BLK1) Prepared&Analyzed:11/17/10
Benzene <0.025 0.025 0.0038 mg/kg wet
Ethylbenzene <0.025 0.025 0.0047 mg/kg wet
Gasoline range organics <5.0 5.0 0.25 mg/kg wet
Toluene <0.025 0.025 0.0024 mg/kg wet
Xylenes(total]
<0.075 0.075 0.012 mg/kg wet
Surrogate:4-Fluorochlorobenzene 28.1 ug/L 25.0
113 80-150
LCS(BOK1704-BS1) Prepared&Analyzed: 11/17/10
Benzene 95.5
ug/L 100 95.5 80-120
Ethylbenzene
92.7
ug/L 100 92.7 80-120
Gasoline range organics 1010
ug/L 1000 101 80-120
Toluene 98.6 ug/L 100
Xylenes(total) 98.6 80-120
290 ug/L 300 96.8 80-120
Surrogate:4-Fluorochlorobenzene 26.7
ug/L 25.0 107 80-150
LCS Dup(BOK1704 BSD1) Prepared&Analyzed:11/17/10
Benzene
89.8
ug/L 100 89.8 80-120 6.23 20
Ethylbenzene 93.6 ug/L 100
Gasoline range organics 93.6 80-120 0.915 20
1040 ug/L 1000 104 80-120 2.07 20
Toluene 93.6
ug/L 100 93.6 80-120 5.25 20
Xylenes(total) 291
ug/L 300 97.0 80-120 0.213 20
Surrogate:4-Fluorochlorobenzene 26.7
ug/L 25.0 107 80-150
Duplicate(B0K1704-DUP1) Source:1004692-02 Prepared&Analyzed: 11/17/10
Gasoline range organics 2.32 5.7 0.28 mg/kg dry <5.7
Surrogate:4-Fluorochlorobenzene NA 20
25.4 ug/L 25.0 102 80-150
Matrix Spike(B0K1704-MS1) Source:1004695-01 Prepared&Analyzed:11/17/10
Benzene
90.8
Ethylbenzene ug/L 100 < 90.8 80-120
94.2 ug/L 100 < 94.2 80-120
Toluene
93.7 ug/L 100 <
Xylenes(total) 93.7 80-120
291 ug/L 300 < 97.1 80-120
Surrogate:4-Fluorochlorobenzene 25.3
ug/L 25.0 101 80-150
Legend Technical Services, Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 9 of 16
ILEGEND
88 Empire Drive
Technical Services, Inc. St Paul,MN 55103
Tel: 651-642-1150
vWW . legend - g rowp . com Fax: 651-642-1239
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none]
Minneapolis,MN 55418 Work Order#: 1004692
Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
PERCENT SOLIDS -Quality Control
Legend Technical Services, Inc.
(Analyte Spike Source %REC %RPD
Result RL MDL Units Level Result %REC Limits %RPD Limit Notes
Batch B0K1913-General Preparation
Duplicate(B0K1913-DUP1) Source:1004694-07 Prepared:11/19/10 Analyzed:11/22/10
Solids 90.0 %
91.0 1.10 20
Legend Technical Services,Inc.
The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 10 of 16
ILEGEND
88 Empire Drive
St
Technical Services, Inc Tel: 6 ,MN 51
ef: 651-642-1150
ww v leoend - group - corn Fax: 651-642-1239
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none]
Minneapolis,MN 55418 Work Order#: 1004692
Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B -Quality Control
Legend Technical Services,Inc.
Analyte Spike Source %REC %RPD
Result RL MDL Units Level Result %REC Limits %RPD Limit Notes I
Batch BOK1605-EPA 5035 Soil(Purge and Trap)
Blank(60K1605-BLK1) Prepared&Analyzed:11/16/10
1,1,1,2-Tetrachloroethane <0.25 0.25 0.059 mg/kg wet
1,1,1-Trichloroethane <0.25 0.25 0.032 mg/kg wet
1,1,2,2-Tetrachloroethane <0.25 0.25 0.026 mg/kg wet
1,1,2-Trichloroethane <0.25 0.25 0.034 mg/kg wet
1,1,2-Trichlorotrifluoroethane <0.25 0.25 0.068 mg/kg wet
1,1-Dichloroethane <0.25 0.25 0.023 mg/kg wet
1,1-Dichloroethene <0.25 0.25 0.025 mg/kg wet
1,1-Dichloropropene <0.25 0.25 0.021 mg/kg wet
1,2,3-Trichlorobenzene <0.50 0.50 0.061 mg/kg wet
1,2,3-Trichloropropane <0.25 0.25 0.024 mg/kg wet
1,2,4-Trichlorobenzene <0.50 0.50 0.027 mg/kg wet
1,2,4-Trimethylbenzene <0.25 0.25 0.018 mg/kg wet
1,2-Dibromo-3-chloropropane <0.50 0.50 0.069 mg/kg wet
1,2-Dibromoethane(EDB) <0.25 0.25 0.022 mg/kg wet
1,2-Dichlorobenzene <0.25 0.25 0.020 mg/kg wet
1,2-Dichloroethane <0.25 0.25 0.027 mg/kg wet
1,2-Dichloropropane <0.25 0.25 0.031 mg/kg wet
1,3,5-Trimethylbenzene <0.25 0.25 0.020 mg/kg wet
1,3-Dichlorobenzene <0.25 0.25 0.026 mg/kg wet
1,3-Dichloropropane <0.25 0.25 0.022 mg/kg wet
1,4-Dichlorobenzene <0.25 0.25 0.017 mg/kg wet
2,2-Dichloropropane <0.50 0.50 0.060 mg/kg wet
2-Butanone <2.0 2.0 0.088 mg/kg wet
2-Chlorotoluene <0.25 0.25 0.014 mg/kg wet
4-Chlorotoluene <0.25 0.25 0.021 mg/kg wet
Acetone <2.0 2.0 0.19 mg/kg wet
Allyl chloride <0.50 0.50 0.058 mg/kg wet
Benzene <0.25 0.25 0.015 mg/kg wet
Bromobenzene <0.25 0.25 0.027 mg/kg wet
Bromochloromethane <0.25 0.25 0.037 mg/kg wet
Bromodichloromethane <0.25 0.25 0.027 mg/kg wet
Bromoform <0.50 0.50 0.027 mg/kg wet
Bromomethane <0.50 0.50 0.11 mg/kg wet
Carbon tetrachloride <0.25 0.25 0.034 mg/kg wet
Chlorobenzene <0.25 0.25 0.019 mg/kg wet
Chloroethane <0.25 0.25 0.037 mg/kg wet
Chloroform <0.25 0.25 0.021 mg/kg wet
Chloromethane <0.25 0.25 0.061 mg/kg wet
cis-1,2-Dichloroethene <0.25 0.25 0.026 mg/kg wet
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 11 of 16
LEGEND
88 Empire Drive
St Paul,MN 55103
Technical Services, inc. Tel: 651-642-1150
Fax: 651-642-1239
w av w . legend - group . r 0 r n
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B -Quality Control
Legend Technical Services, Inc.
Spike Source %REC %RPD
Analyte Result RL MDL Units Level Result %REC Limits %RPD Limit Notes
Batch BOK1605-EPA 5035 Soil(Purge and Trap)
Blank(130K1605-BLKI) Prepared&Analyzed:11/16/10
cis-1,3-Dichloropropene <0.25 0.25 0.022 mg/kg wet
Dibromochloromethane <0.25 0.25 0.034 mg/kg wet
Dibromomethane <0.25 0.25 0.029 mg/kg wet
Dichlorodifluoromethane <0.50 0.50 0.099 mg/kg wet
Dichlorofluoromethane <0.25 0.25 0.038 mg/kg wet
Ethyl ether <0.50 0.50 0.038 mg/kg wet
Ethylbenzene <0.25 0.25 0.011 mg/kg wet
Hexachlorobutadiene <1.0 1.0 0.069 mg/kg wet
Isopropylbenzene <0.25 0.25 0.019 mg/kg wet
m,p-Xylene <0.50 0.50 0.047 mg/kg wet
Methyl isobutyl ketone <0.50 0.50 0.082 mg/kg wet
Methyl tert-butyl ether <0.25 025 0.016 mg/kg wet
Methylene chloride <1.0 1.0 0.058 mg/kg wet
Naphthalene <0.50 0.50 0.055 mg/kg wet
n-Butylbenzene <0.25 0.25 0.027 mg/kg wet
n-Propylbenzene <0.25 0.25 0.021 mg/kg wet
o-Xylene <0.25 0.25 0.025 mg/kg wet
p-Isopropyltoluene <0.25 0.25 0.014 mg/kg wet
sec-Butylbenzene <0.25 0.25 0.017 mg/kg wet
Styrene <0.25 0.25 0.020 mg/kg wet
tert-Butylbenzene <0.25 0.25 0.018 mg/kg wet
Tetrachloroethene <0.25 0.25 0.028 mg/kg wet
Tetrahydrofuran <2.0 2.0 0.12 mg/kg wet
Toluene <0.25 0.25 0.016 mg/kg wet
trans-1,2-Dichloroethene <0.25 0.25 0.030 mg/kg wet
trans-1,3-Dichloropropene <0.25 0.25 0.023 mg/kg wet
Trichloroethene <0.25 0.25 0.041 mg/kg wet
Trichlorofluoromethane <0.25 0,25 0.035 mg/kg wet
Vinyl chloride <0.25 0.25 0.065 mg/kg wet
Surrogate:4-Bromofluorobenzene 51.8 ug/L 50.0 104 80-124
Surrogate:Dibromofuoromefhane 52.3 ug/L 50.0 105 77.1-123
Surrogate:Toluene-d8 53.4 ug/L 50.0 107 78.1-125
LCS(B0K1605-BS1) Prepared&Analyzed:11/16/10
1,1,2,2-Tetrachloroethane 46.5 ug/L 50.0 92.9 75-120
1,1-Dichloroethane 52.3 ug/L 50.0 105 79.6-120
1,1-Dichloroethene 49.7 ug/L 50.0 99.4 78.3-120
1,3,5-Trimethylbenzene 45.1 ug/L 50.0 90.3 77-120
1,4-Dichlorobenzene 45.9 ug/L 50.0 91.8 75-125
2-Chlorotoluene 45.1 ug/L 50.0 90.1 75.9-120
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 12 of 16
LEGEND
88 Empire Drive
Technical Services, Inc. St Paul,MN 55103
Tel: 651-642-1150
www . I e g g r,o U . corn Fax: 651-642-1239
end - p
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none]
Minneapolis,MN 55418 Work Order#: 1004692
Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B -Quality Control
Legend Technical Services, Inc.
+Analyte Spike Source %REC %RPD
Result RL MDL Units Level Result %REC Limits %RPD Limit Notes I
Batch BOK1605-EPA 5035 Soil(Purge and Trap)
LCS(BOK1605-BSI) Prepared&Analyzed:11/16/10
Benzene 50.3 ug/L 50.0
101 80-120
Bromoform 49.3
ug/L 50.0 98.6 80-120
Chlorobenzene
48.8
ug/L 50.0 97.7 80-120
Chloroform 51.5
ug/L 50.0 103 80-120
Ethylbenzene 48.1
ug/L 50.0 96.2 80-120
n-Butylbenzene
43.8
ug/L 50.0 87.6 75-125
n-Propylbenzene 45.0
ug/L 50.0 89.9 75-120
Toluene 50.8
ug/L 50.0 102 80-120
Trichloroethene 50.1
ug/L 50.0 100 80-120
Vinyl chloride
47.9
ug/L 50.0 95.8 75-130
Surrogate:4-Bromofluorobenzene 53.7
ug/L 50.0 107 80-124
Surrogate:Dibromofluoromethane 51.8
ug/L 50.0 104 77.1-123
Surrogate:Toluene-d8 53.2
ug/L 50.0 106 78.1-125
Matrix Spike(B0K1605-MS1) Source:1004660-01 Prepared&Analyzed:11/16/10
1,1,2,2-Tetrachloroethane 47.7 ug/L 50.0 <
1,1-Dichloroethane 95.4 75-125
52.4 ug/L 50.0 < 105 78.7-123
1,1-Dichloroethene 51.3
ug/L 50.0 < 103 75.8-121
1,3,5-Trimethylbenzene 46.0 ug/L 50.0 <
1,4-Dichlorobenzene 92.0 75-120
46.1 ug/L 50.0 < 92.1 75-125
2-Chlorotoluene 45.9
ug/L 50.0 < 91.8 75-120
Benzene
51.1
ug/L 50.0 < 102 80-120
Bromoform 51.0
ug/L 50.0 < 102 80-120
Chlorobenzene
49.7
Chloroform ug/L 50,0 < 99.4 80-120
t 50.0 ug/L 50.0 < 99.9 80-120
Ethylbenzene 49.0
ug/L 50.0 < 98.0 80-120
n-Butylbenzene 44.5
ug/L 50.0 < 88.9 73.8-125
n-Propylbenzene 46.1
ug/L 50.0 < 92.2 75-120
Toluene 51.5
ug/L 50.0 < 103 80-120
Trichloroethene 50.9
ug/L 50.0 < 102 80-120
Vinyl chloride 48.4
ug/L 50.0 < 96.8 74.8-130
Surrogate:4-8romofluorobenzene 54.4
ug/L 50.0 109 80-124
Surrogate:Dibromofluoromethane 53.2
ug/L 50.0 106 77.1-123
Surrogate:Toluene-d8 54.1
ug/L 50.0 108 78.1-125
Matrix Spike Dup(B0K1605-MSD1) Source:1004660-01 Prepared&Analyzed: 11/16/10
1,1,2,2-Tetrachloroethane 48.7
ug/L 50.0 < 97.5 75-125 2.17 20
1,1-Dichloroethane 53.1
ug/L 50.0 < 106 78.7-123 1.46 20
1,1-Dichloroethene 50.7
ug/L 50.0 < 101 75.8-121 1.17 20
1,3,5-Trimethylbenzene 47.1 ug/L 50.0 <
94.2 75-120 2.31 20
Legend Technical Services, Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 13 of 16
88 Empire Drive
IL EGEND St Paul,MN 55103
Technical Services, Inc. Tel: 651-642-1150
Fax: 651-642-1239
ww . legend - group . corn
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
VOC 8260B -Quality Control
Legend Technical Services, Inc.
Spike Source %REC %RPD
Analyte Result RL MDL Units Level Result %REC Limits %RPD Limit Notes
Batch B0K1605-EPA 5035 Soil(Purge and Trap)
Matrix Spike Dup(B0K1605-MSD1) Source:1004660-01 Prepared&Analyzed: 11/16/10
1,4-Dichlorobenzene 47.5 ug/L 50.0 < 95.1 75-125 3.15 20
2-Chlorotoluene 47.0 ug/L 50.0 < 94.0 75-120 2.46 20
Benzene 52.6 ug/L 50.0 < 105 80-120 2.77 20
Bromoform 51.7 ug/L 50.0 < 103 80-120 1.44 20
Chlorobenzene 50.8 ug/L 50.0 < 102 80-120 2.24 20
Chloroform 52.8
ug/L 50.0 < 106 80-120 5.43 20
Ethylbenzene 50.4 ug/L 50.0 < 101 80-120 2.69 20
n-Butylbenzene 45.5
ug/L 50.0 < 91.0 73.8-125 2.27 20
n-Propylbenzene 47.1 ug/L 50.0 < 94.2 75-120 2.11 20
Toluene 52.7 ug/L 50.0 < 105 80-120 2.28 20
Trichloroethene 51.5 ug/L 50.0 < 103 80-120 1.23 20
Vinyl chloride 48.4 ug/L 50.0 < 96.8 74.8-130 0.0198 20
Surrogate:4-Bromofluorobenzene 54.0 ug/L 50.0 108 80-124
Surrogate:Dibromofluoromethane 53.6 ug/L 50.0 107 77.1-123
Surrogate:Toluene-d8 54.0 ug/L 50.0 108 78.1-125
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 14 of 16
IL EGEND 88 Empire Drive
St Paul,MN 55103
Technical Services, Inc. Tel: 651-642-1150
Fax: 651-642-1239
:v w w . l e g e n d - group . c o r n
Thatcher Engineering Inc. Project: Prior Lake
3055 Old Hwy 8,Suite 103 Project Number: [none] Work Order#: 1004692
Minneapolis,MN 55418 Project Manager: Mr.Dennis McComas Date Reported: 11/30/10
Notes and Definitions
Less than value listed
dry Sample results reported on a dry weight basis
NA Not applicable. The%RPD is not calculated from values less than the reporting limit.
MDL Method Detection Limit
RL Reporting Limit
RPD Relative Percent Difference
LCS Laboratory Control Spike=Blank Spike(BS)=Laboratory Fortified Blank(LFB)
MS Matrix Spike=Laboratory Fortified Matrix(LFM)
Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 15 of 16
88 Empire Drive
LEGEND
ISt Paul,MN 55103
Technic rvices, Inc. Tel: 651-642-1150
Fax: 651-642-1239
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Legend Technical Services,Inc. The results in this report apply to the samples analyzed in accordance with
the chain of custody document. This analytical report must be reproduced
in its entirety.
Page 16 of 16
APPENDIX D
METHODS AND PROCEEDURES
THATCHER ENGINEERING, INC.
METHODOLOGIES AND PROCEDURES
Field Screening Procedure
The instrument used for field screening is a Model 580B Photoionization Detector (PID)
with a 10.6 eV lamp. The unit is calibrated daily using benzene standard, and measures
in parts per million(ppm).
The field screening procedure involves half filling a quart size "Ziploc Freezer Bag"with
soil immediately after sample collection. All soil clumps are manually broken up and the
bag is vigorously shaken for 15 seconds. We allow headspace development for at least
10 minutes. When the temperature is below 50°, headspace development and analysis is
performed in a heated vehicle or building. Prior to measuring the headspace vapor, the
bag is again vigorously shaken for 15 seconds. The sample reading is taken within 20
minutes of sample collection.
The analysis procedure involves introducing the instrument-sampling probe through a
small opening in the bag to a point one half of the headspace width. We carefully avoid
putting the probe into soil or water droplets. The probe is kept in the bag for
approximately one minute and the highest reading in that time is recorded. Any erratic
readings are noted during headspace analysis.
II. Soil Sampling
The procedure for collecting soil samples from excavations, soil piles or from split spoon
samplers is similar and will be covered in this section.
The possibility of cross contamination is minimized or reduced by using dedicated
sampling equipment for each sample collected where possible. If dedicated sampling
tools are not available, they are decontaminated between samples. These tools include
shovels, trowels, syringes, hand augers and split spoon samplers. The decontamination
process involves washing the equipment in a tri-sodium phosphate solution and double
rinsing and drying the equipment before each use. Clean latex gloves are used for the
collection of each soil sample collected to reduce cross contamination.
When sampling excavation sidewalls or floors or from a stockpile, at least one foot of soil
is removed so a fresh surface is exposed, prior to collecting the sample. This ensures the
collection of a fresh sample.
When sampling from a clear plastic tube from a geoprobe, the tube is cut with a utility
knife and a sample is quickly collected. Two (2) separate samples are collected
simultaneously for most sampling locations. One sample is quickly placed into a"Ziploc
Bag" and a separate sample is quickly placed into appropriate jars or vials provided by
the analytical laboratory. The amounts of soil placed in the containers and the
Page 1
preservatives added are according to the analytical laboratory requirements (which in turn
are in accordance with MPCA protocol). Soil previously used for soil screening is never
used for analytical samples.
All sample jars and vials are tightly sealed, labeled and placed in an iced cooler for
transport to the laboratory for analysis. The labels indicate:
• Type of analysis
• Name of facility
• Monitoring point
• Name of person and company collecting sample
• Time and date of collection
• Whether a preservative was added
Prior to leaving the sampling site, a chain of custody is completed for the samples. The
chain of custody indicates:
• Name of facility and address
• Sample identification
• Number of containers
• Sample preservatives
• Sample type
• Analysis required
• Sampled date and time
• Sampler an sampler's signature
After sampling is complete and the chain of custody is completed, the samples and chain
of custody are promptly transported to the laboratory for analysis.
III. Soil Boring Procedures
Borings are made at locations determined by the field engineer or geologist and are in
accordance with MPCA Guidance Document 4-01. Locations are shown on the Sample
Location Map in the remedial investigation report.
Ground surface elevations at the boring and monitoring well locations are determined
after the installation of the borings or monitoring wells using standard surveying
techniques.
Borings are made with a "geoprobe", which employs direct push technology. The
samples are collected continuously into four (4) foot 1-inch clear plastic tubes. The
borehole is 1.5 inches in diameter. For details of how the geoprobe operates, see
manufacturer literature from the Geoprobe Company.
All down-hole equipment is decontaminated between borings to avoid cross
contamination using a tri-sodium phosphate solution as described in Section II.
Page 2
A soil boring log is maintained in the field for each soil boring. The log shows: surface
elevations of the borings and water table depth, geologic identification of subsurface
materials, soil and bedrock contacts, USCS identification, graphic log, sampling interval,
OVA readings and the monitoring well description. Refer to the attached boring logs for
descriptions of the subsurface conditions encountered in the borings.
The field engineer or geologist collects soil samples. Samples are placed in pre-marked
collection jars or vials and "Ziploc Bags"according to procedures described in Sections I
and II and transported to the laboratory.
All boreholes not completed as monitoring wells are properly abandoned in accordance
with current Minnesota Department of Health(MDH)rules. Prior to abandoning borings,
a groundwater sample will be collected if groundwater is present in the boring and if the
collection of the sample is necessary, according to MPCA Guidance Document 4-01.
IV. Ground Water Collection Procedure
Using the "Geoprobe", a one-time ground water sample can be collected. The procedure
involves placing a temporary PVC slotted screen and casing into the 1.5-inch diameter
hole and allowing water to enter the screen. A peristaltic pump is then connected to the
casing and a water sample is obtained. The sample is immediately pumped into the
laboratory prepared bottles and vials. For the specific procedures followed, see the
manufacturer literature available from the Geoprobe Company.
V. Monitoring Well Installation
If monitoring wells are constructed, the construction is completed in accordance with the
MDH water well construction code and must be permitted by the MDH. All monitoring
well materials are properly cleaned prior to installation.
When monitoring wells are completed in a boring, a well construction "as-built" diagram
is completed on boring logs. The information on the boring logs include:
• Soil classification in accordance with the 1952 Unified Soil Classification
System (USCS) or with American Society for Testing Materials (ASTM)
methods 2487 or 2488.
• Further description of soil (grain size, sorting, color, etc.)
• Depth of significant changes in material (feet).
• Depth of sampled horizons (feet).
• Approximate location of the water table (feet).
• Organic vapor measurements(parts per million (ppm)).
• Comments regarding significant geologic and hydrogeologic features, visual
or olfactory evidence of contamination, etc.
• Diagram of major well features (borehole annulus, screen, casing/riser, sand
pack,pack seal, grout, surface seal,protective casing, etc.)
• Depth from ground surface to all major well features.
Page 3
• Well screen slot size.
• Sand pack size.
• Inner diameters of riser, screen,protective casing and borehole.
• Well construction materials.
• Unique well number and project identification number.
• Date boring started and completed.
• Name of driller and consultant present during drilling.
• Ground surface elevation(feet) and riser elevation.
For water table monitoring wells, a ten (10) foot well screen is placed so the screen
intersects the water table. For deep monitoring wells, either a five foot or ten foot screen
is placed below the water table and the screen placement varies depending on the purpose
of the well.
Once the well is properly constructed, according to MDH rules, the monitoring well is
developed. The purpose for well development is to ensure hydraulic connection with the
aquifer and to remove any drilling fluids, if used. Either a bailer or a groundwater
submersible pump is utilized to develop the wells. At least ten volumes of water is
removed from well, or until the water appears clear of drilling fluids and materials. All
development procedures and results are documented.
VI. Groundwater Sampling Procedures
A. Sampling Order
The monitoring wells are purged and sampled with the least contaminated wells
(if known) proceeding to increasingly more contaminated wells. The first well
sampled will most likely be the upgradient well and the last well sampled the
downgradient well closest to suspected contamination.
B. Water Level Measurement
The first step in groundwater sampling is measuring the water level. A reading
will be taken with an electronic water level meter, measured to the top of casing
or other reference point (which has a surveyed elevation). The water level meter
is properly decontaminated prior to use in each well. The initial static water level
is measured and recorded. The water level is determined to the nearest 0.01 foot
from the surveyed top of casing or other reference point. The water level
elevation will be determined later.
Prior to purging the monitoring well, the total depth is measured and recorded.
The measuring device is properly decontaminated prior to use in each well. The
total depth is measured to the same reference point as the water level and is
determined to the nearest 0.01 foot.
Page 4
C. Well Purging
Prior to sampling for laboratory analysis, a minimum of five well casing water
column volumes is removed. This is done to ensure that samples contain fresh
formation water. The amount of water purged is recorded.
The well is purged using either bailers or a pump. The bailers used are
polyethylene disposable bailers or stainless steel bailers, which are
decontaminated prior to each use. The pump utilized is low flow submersible
centrifugal pump, which is in accordance with MPCA Fact Sheet 3.23.
Once the well has been properly purged, the field water quality parameters are
measured.
D. Field Parameters
pH:
The pH is measured using a direct reading probe. The procedure involves
obtaining a monitoring well sample and placing the pH electrode in the jar, taking
care to protect the fragile glass tube on the end of the electrode. After allowing
the pH probe to equilibrate for at least one minute, a reading is taken. All pH
readings are recorded to the nearest 0.1 unit.
Before sampling each day, the pH meter is calibrated using a two point calibration
method, with a buffer of pH=4 and a buffer of pH=7.
Temperature:
The temperature is obtained by using a membrane electrode dissolved oxygen
meter. After the monitoring well is purged, the membrane electrode probe is
slowly lowered at least five feet below the water level. The probe is allowed to
equilibrate for at least five minutes. When the temperature reading on the digital
reading is stable for at least one minute, the temperature is recorded and the
instrument is switched from the temperature setting to the dissolved oxygen
setting. The temperature is recorded to the nearest 0.1 degree Celsius. The
instrument is calibrated before each day's use.
Dissolved Oxygen:
As mentioned above, a membrane electrode meter is used to measure dissolved
oxygen in the monitoring wells.
As mentioned above, the probe is slowly lowered into the monitoring well, at
least five feet below the water level. After the temperature has stabilized and has
Page 5
been recorded, the instrument is switched to measure dissolved oxygen in mg/1.
The instrument is left in the well until it stabilizes. A reading is considered to be
stable, if after one minute there is no change in the reading. The reading is then
recorded to the nearest 0.1 mg/l.
E. Sample Collection
Once the well has been purged and the field parameters have been measured, the
monitoring wells are sampled. Using either a clean polyethylene disposable bailer
or a stainless steel bailer, the bailer is slowly lowered to the water level and filled.
Clean string is used with the bailers. Once the bailer is filled, it is slowly
withdrawn and quickly brought to the surface. The water sample is quickly
transferred from the bailer to the sample container(s). Care is taken to minimize
turbulence and exposure to the atmosphere. A clean pair of latex gloves is worn
at each monitoring well.
When sampling for volatile organic compounds (VOCs), the 40-milliliter (ml)
vial is used in such a manner that minimizes turbulence, air entrapment and
overfilling. The bottle is filled completely, leaving a positive meniscus at the top
of the vial. After capping, the vial is inverted and tapped with a finger to check
for air bubbles. If air bubbles are present, the vial is discarded and a replacement
filled.
F. Trip Blanks and Field Blanks
Trip blanks and field blanks are collected to detect background or method
contamination. The following Quality Assurance/Quality Control (QA/QC)
samples are collected:
• One trip blank for each cooler of VOC samples, sampled for VOC's or
BTEX.
• One temperature blank for each cooler of monitoring well samples.
• One field blank each day for VOC's or BTEX.
Trip Blanks:
Trip blanks for VOC's are filled and sealed by the analytical laboratory with
organic-free water. Trip blanks consist of two or three pre-filled 40-ml purge and
trap vials and accompanies each cooler containing VOC samples. The travel
blanks always travel with the actual samples, so the blanks are exposed to the
same conditions as the actual samples. The blank samples are not opened until
analyzed in the laboratory along with the actual VOC samples they have
accompanied.
Field Blanks:
Page 6
Field blanks are collected in the field using the same type of sample containers as
the monitoring well samples. All field blanks are filled using clean organic-free
water. The field blanks are collected through the same equipment and the same
methods are used to collect samples. We attempt to simulate actual field
sampling methods and to have the water contact all the interfaces that the sample
would contact. These include bailers, ambient air, sampling containers and
tubing.
G. Sample Delivery and Transport
After sample collection, the jars are placed in an iced cooler. A Chain of Custody
form is completed prior to leaving the sample site. As part of the sampling
procedure, field conditions are recorded. These include:
• Time and date of collection
• Air temperature
• Precipitation/moisture
• Approximate wind speed and direction
• Ambient odors
Page 7