3165 Lexington Ave - Fire Sprinkler Modifications'
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' UNITED STATES POSTAL SERYICE
BULK MAIL CENTER
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FIRE SPRINKLER MUQIFICATIONS
' ST. PAUL, MN
JUNE 13, 1990
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PREPARED BY:
' ORR-SCHELEN-MAYERUN & ASSOCIATES, INC.
2021 East Hennepin Avenue
Suite 238
' Minneapolis, MN 55403
(612) 331-8660
' OSM Cortunission #4575.01
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Schelen
QS 07
Mayeron &
Associates, inc.
June 13, 1990
Mr. Michael J. Schech
UNITED STATES POSTAL SERVICE
TWIN CITIES DIVISION SUPPORT SERVICES
180 East Kellogg Boulevard
Suite 603
St. Paul, MN 55101-9991
RE: USPS BULK MAIL CENTER-SPRINKLER MODIFICATIONS
OSM Commission #4575.01
2021 Eas[ Hennepin nvenue
Minneapolis, MN 55413
612-33I-8660
FAX 331-3806
Engineers
Surveyors
Planners
' Dear Mr. Schech:
Enclosed are two(2) copies of the report identifying the Fire Sprinkler
t Modifications for the above referenced facility. The packages consist of sketches
and instructions to make the Fire Sprinkler changes as required by the addition of
new Container Loaders and Parcel Slides.
' An additional copy has been forwarded to Larry Hoglin for his review.
Dale Wegleitner, City of Eagan Fire Marshall, had also requested that we send him a
' copy for their records. Bill Bruestle, City of Eagan Lead Building Inspector, and
Mr. Wegleitner were consulted in the preparation of this report. They visited the
site on May 29, 1990 and met with Mr. Hoglund and myself.
' If you have any questions, please call.
Respectfully,
' ORR-SCHELEN-MAYERON
& ASSOCIATES, INC.
v?-
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' Linda J. Pederson, P.E.
LJP:syb
' 6/90-23j
cc: Dale Wegleitner /CITY OF EAGAN JJS
' Larry Hoglin FILE
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I hereby certify that this plan, specification or report
was prepared by me or under my direct supervision and
that I am a duly Registered Professional Engineer under
the laws of the State of Minnesota.
Date : ('11319p
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Reg. No. 14408
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, INSTRUCTIONS TO INSTALLER
asssaaaaa=asasma=m?saaazaa
I GENERAL
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1. All designs, work and materials shall conform to the latest applicable editions
of the National Fire Protection Assocation (NFPA) Standards and applicable
State codes, whether the stipulations therein are stated as positive
requirements or as recommendations. Additionally, all equipment, materials and
installations shall comply with the Factory Mutual "Approval Guide" as well as
all governing Local regulations.
2. Sprinkler piping material is to be schedule 40 steel pipe as approved by NFPA,
UL and all applicable Local codes.
3. Sprinkler head types shall be:
Standard, automatic upright sprinkler with 1/2" orifice and fusible link.
Temperature rating shall be 165 degrees Fahrenheit.
The Installer is to provide the Owner with six (6) spare replacement heads each
type of sprinkler head installed.
4. All dimensions shall be field-verified at the site prior to fabrication.
5. CLEANING - Flush out all new piping systems with water until the discharge runs
clear. The flow of water shall be sufficient to attain line velocities of 5-6
feet per second. Flushing shall be in accordance with NFPA 13. Where the
System is connected to the existing building main, the Contractor shall also
flush the existing mains.
6. TESTS - Fill the piping sections with water. Open the air vents or other
outlets, as necessary, to expel entrapped air. Hydraulically test all piping
at 200 psig for a period of at least 2 hours. Correct any defective joints and
retest. Measure the hydrostatic pressure at the low point of each System or
zone being tested.
7. The Installer is responsible for all patching and repair of existing Facilities
affected by this work.
8. Work Schedules are to be coordinated with the owner.
9. Installer is responsible for obtaining all applicable permits.
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REMEDIAL INVESTIGATION REPORT
U.S. Postal Service Bu1k Mai1 Center
3165 South Lexington Avenue
Eagan, Minnesota
MPCA Site I.D. #: LEAK00004230
Prepared for:
Mr. Roger Leitch
United States Postal Service
Facilities Service Office
2051 Killebrew Drive, Suite 620
Bloomington, Minnesota 55425-1874
Prepared by:
DPRA Incorporated
E-1500 First National Bank Building
332 Minnesota Street
St. Paul, Minnesota 55101
Contract No. 269986-89-J-0002
Work Order No. 38
August 1992
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? TABLE OF CONTENTS
(continued)
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? LIST OF FIGURES
, Figure 1- Site Location Map
Figure 2 - Site Map
Figure 3- Utility Locations, Process Buidling Area
? Figure 4- Utility Locadons, Vehicle Service Center Area
Figure 5- Soil Vapor and Sample Locations, USTs 1 and 2
Figure 6- Soil Vapor and Sample L.ocations, UST 3
? Figure 7- Soil Vapor and Sample Locations, USTs 4,5, and 6
Figure 8- Soil Boring Locations
, LIST OF- TABLFS
? Tabie 1- Summary of USTs Closed
Table 2- Nonaqueous Analytical Results - UST Excavations -
Process Building Area
? Table 3- Nonaqueous Analytical Results - UST Excavations -
Vehicle Service Center ?Area
Table 4 - PID Measurements
' Table 5- Nonaqueous Analytical Results
, LIST OF APPENDICES
Appendix A- Excavation Report for Petroleum Release Site
? Appendix B= Laboratory Reports and Chain-of-Custody Forms
Appendix C- MPCA Land Application of Soil Approval Letter and Soil Monitoring Results
Appendix D - Boring Logs
' Appendix E- Field Methods and Procedures
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' 1.0 INTRODUCTION
? The U.S. Postal Service (LTSPS) conlracted with DPRA Incorporated (DPRA) to observe and
' document the removal of seven underground storage tanks (USTs) at the U.S. Postal Service
Bulk Mail Center in Eagan, Minnesota. Following the UST removals the USPS contracted
? with DPRA to conduct a remedial investigation to document the degree and extent of
petroleum contamination.
' On July 10, 1991, a release was reported to the Minnesota Pollution Control Agency
, (MPCA). 1fie MPCA has assigned Site I.D. #: LEAK00004230 to this site.
' 1.1 Pum
' The purpose of this investigation was to assess the condition of the USTs and the soil
surrounding and below the USTs, to identify actual or potential impacts of the release, and to
? recommend further action based on the findings.
, 1.2 Scone of Services
, The scope of services performed by DPRA at this site consisted of the following activities:
, • Screened soil samples collected during the UST excavations with a portable
HNiJ Model 101 photoionization detector (PID).
? • Documented the conditions of seven USTs, their associated piping, and the soil
within the UST excavations during tank removal.
, • Submitted selected soil samples for analysis for benzene, ethylbenzene,
toluene, and xylenes (BETX), methyl tertiary butyl ether (MTBE), total
, hydrocarbons (TH) as gasoline and fuel oil, volatile organic compounds
(VOCs), polychlorinated biphenyl (PCBs), cadmium, chromium, and lead.
' 0 Documented the treatment of petroleum-contaminated soil.
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• Directed the advancement of three (3) standard penetration soil borings.
• Screened soil samples recovered from the soil borings with a portable HNiJ
Model 101 PID.
• Collected soil samples from each boring and submitted the samples for
chemical analysis for benzene, ethylbenzene, toluene, and xylenes (BETX),
methyl tertiary butyl ether (MTBE), and total hydrocarbons (TH) as gasoline
and fuel oil.
• Advanced two hand auger borings within the proximity of UST 7, which was
closed in place.
• Collected soil samples from each boring and submitted the samples for
chemical analysis for VOCs, PCBs, TH as fuel oil, cadmium, chromium, and
lead.
• Prepazed a Remedial Investigation (RI) report which sarisfies the MPCA
requirements.
The remaining sections of this report include background information, excavation results,
remediation investigation results, discussions, conclusions, and recommendations.
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, 2.1
Site I.ocation
2.0 BACKGROUND INFORMATION
? The U.S. Postal Bulk Mail Center is located at 3165 South Lexington Avenue, Eagan,
? Minnesota, and occupies approximately 10 acres of land. The property has coordinates of
44°SQ'33" latitude and 93°09'00" longitude. The eastern three-fourths of the property is
? located in the southeast quarter of the northeast quarter of Section 10, Township 27 North
('T27N), Range 23 West (R23V). The western one-fourth of the property is located in the
? southwest quarter of the northeast quarter of Section 10, Township 27 North (T27N), Range
23 West (R23V). The property is located in Dakota County. A site locarion map is
? included as Figure 1.
, 2.2 Site Ownershiu
' The U.S. Postal Service (USPS) owns and operates the Bulk Mail Center. The USPS contact
person is:
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Mr. Roger Leitch
? U.S. Postal Service
Facilides Service Office
2051 Killebrew Drive
? Suite 620
Bloomington, MN 55425-1874
? (612) 851-1157
e 2.3 Site Description
' The Bulk Mail Center is comprised of a Process Building, Vehicle Service Center, and an
Enclosed Vehicle Shelter. The service center and shelter aze used for general maintenance
' and servicing of postal vehicles. The site is bounded by Lexington Ayenue to the east and a
wooded area to the north, south, and west. The properties located across Lexington Avenue,
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¦ adjacent to the Bulk Mail Center are currently owned by 3M and Shaw Industries. To the
, south, adjacent to the wooded area, aze residential properties located approximately one
block from the subject property.
, A map showing the "Process Building Area," the "Vehicle Service Center Area," and all
? pertinent site features are presented in Figure 2. Utilities located in the UST basin areas aze
shown in Figures 3 and 4.
? 2.4 Undereround Storage Tank Information
? Six USTs, associated product lines, and pump island and dispensers were removed from this
, site and one UST was ciosed in place between July 10 and August 13, 1991. The USTs are
documented by the Postal Service as being installed in 1975. The tanks aze listed in Table 1
' and the locations are shown in Figure 2.
' 2.4.1 Process Buildin,g Area
' USTs 1 and 2, two former 19,000-gallon heating oil USTs, located approximately 115 feet
north of the Process Building on the east side of the driveway were removed and replaced by
? one 25,000-gallon heating oil UST. The two headng oil tanks were used as a backup to the
natural gas heating system, but had not been in use for a couple of years.
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2.4.2 Vehicle Service Center Area
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UST 3, a 2,000-gallon hearing oil tank, iocated on the north side of the Vehicle Service
, Center was removed and replaced by a 2,500-gallon heating oil UST. UST 4, a 4,000-
gallon gasoline tank, and UST 5, a 4,000-gallon diesel tank, located on the east side of the
Vehicle Service Center, were removed and replaced by one 10,000-gallon diesel UST and
? one 10,000-gallon gasoline UST. The dispensers and lines, located north of USTs 4 and 5,
were also removed and replaced. UST 6, a 560-gallon waste oil tank located on the east side
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? of the Vehicle Service Center was removed and UST 7, a 560-gallon waste oil UST located
? on the southwest side the Vehicle Service Center was closed in place due to the proximity of
gas and sewer lines.
? The headng oil tank was used as a backup to the natural gas heating system, but had not
' been in use for a couple of years. The Eagan Post Office used the gasoline tank to service
camer vehicles, and the diesel tank to service tractors. The two waste oil tanks were used
? for storing waste oil products generated at the service bays in the Vehicle Service Center.
1 2.5 Petroleum Release Information
? There are no documented reports of an uncontrolled release of petroleum products from this
site prior to the documentation of the release detected during the excavation of the six USTs.
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2.5.1 Process Building Area
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During the excavation of the two 19,000-gallon heaUng oil tanks (USTs 1 and 2), DPRA
? detected elevated organic vapor concentrations with the PID in the soils surrounding the
tanks. Elevated PID readings were also recorded in soils below the pipe lines during
f+ removal. Both USTs appeared to be in good condition with no visible holes or pitting. The
cause of the elevated PID readings in the two heating oil basins is unknown; however, it is
i suspected that overfills and spills are a possible cause of release.
', 2.5.2 Vehicle Service Center Area
, During the excavation of USTs 4, 5, and 6, DPRA detected elevated organic vapor
? concentrations with the PID in the soils sunounding the tanks. Extensive conosion and a
few small holes were observed in UST 6, the waste oil tank, and conosion with some pitting
? was observed in both USTs 4 and 5, the gasoline and diesel tanks. During the excavation of
UST 3, the 2,000-gallon heating oil tank, elevated PID readings were recorded in the soil
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I sunounding the tank. UST 3 appeared to be in good condition with no visible holes or
? pitting. Overfills and spills aze a possible -cause of the release. Elevated PID readings were
also recorded in soils below dispensers and lines during removal.
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I 3.0 EXCAVATION RESULTS
? Between July 10 to July 31, 1991, Pump and Meter Service, under contract with the USPS,
? removed and disposed of six USTs located at the U.S. Postal Service Bulk Mail Center. In
addition, one UST was closed in place. DPRA personnel were on site to observe and
? document the condition and removal of the USTs and their surrounding soils. Visual
observations made and data collected during the UST excavarions are presented on the
? MPCA form "Excavation Report for Petroleum Release Sites." This form is included as
Appendix A.
? 3.1 Process Building Area
? A discussion of the results of the excavations of USTs 1 and 2 located approximately 115
? feet north of the Process Buiiding is provided in the following sections.
' 3.1.1 Field Observations and PID Measurements
? As the USTs were excavated, soil vapor samples were collected and screened with an HNU
Model 101 PID equipped with a 102 eV lamp and calibrated for direct readings in parts per
? million (ppm) volumeJvolume of benzene. The soil vapor samples were analyzed using jar
headspace analysis in accordance with MPCA guidelines. According to MPCA guidance
? documents, PID measurements above background (0.0 ppm) in the soils surrounding the fuel
oil tanks are considered contaminated.
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PID readings ranged from 1.5 to 40 .ppm during the excavation of UST 1, 1.0 to 30 ppm
? during the excavation of UST 2, and 0.0 to 300 ppm during the removal of the associated
? piping. The highest readings were recorded in soils azound the fill pipe of USTs 1 and 2 and
below the associated pipe lines. The soil vapor sample locations aze shown in Figure 5, and
? the PID readings from azeas within the excavations and along the pipe line trench aze
presented in the MPCA's Excavation Report form in Appendix A.
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? The two 19,000-gallon heating oil USTs were cathodically protected and coated steel tanks.
? Both tanks were in good condition with no visible holes or pitting noted during excavation
and removal. The backfill material within the UST 1 and 2 basins consisted of silty sand,
? and the native soil within both basins consisted of a sandy clay. The dimensions of the two
excavations were as follows: the UST 1 basin was approximately 50 feet long by 29 feet
? wide by 16.5 feet deep; and the UST 2 basin was approximately 37 feet long by 22 feet
wide by 15 feet deep. The limits of the excavations aze shown in Figure 3. A total of
? approximately 75 cubic yards of contaminated soil was removed from the UST 1 and 2
basins and along the pipe lines.
? 3.1.2 Analytical Results
? After excavation of the tanks, piping, and contaminated soil was completed the following
? eleven (11) soil samples were collected to represent the final extent of the excavation: two
from the bottom of the UST 1 basin, SS-8 and SS-9, four from the sidewalls of the UST 1
? basin, SS-1, SS-6, SS-7, and SS-10, two from the bottom of the UST 2 basin, SS-11 and SS-
17, and three from beneath the associated piping, P-1, P-2, and P-3. All samples were
? submitted to the laboratory for analysis for BETX, and TH as fuel oil. Soil sample locations
are presented in Figure 5. This information is also presented in the MPCA's Excavation
? Report in Appendix A.
? Analysis of the samples detected low levels of petroleum constituents. Benzene was detected
at 0.010 ppm in samples P-1 and P-3, collected from beneath the piping at 7 feet below
, ground surface. The analytical results of the remaining samples were below method
detection limits.
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? In addition, three soil samples, SP-1, SP-2, and SS-19, were collected from stockpiled soil
and submitted to the laboratory for analysis for BETX and TH as fuel oil. TH as #2 fuel oil
? was detected at 3 ppm in stockpile sample SP-2.
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? The soil sample analysis results are presented in Table 2 and the laboratory reports and
? chain-of-custody forms for all sampling events aze included in Appendix B.
1 3.2 Vehicle Service Center Area
? A discussion of the results of the excavation of USTs 3, 49 5, and 6, located on the north
and east sides of the Vehicle Service Center, and UST 7, the abandoned 560-gallon waste oil
? tank located on the southeast corner of the Vehicle Service Center is provided below.
1 3.2.1 Field Observations and PID Measurements
? As the USTs were excavated, soil vapor samples were collected and screened with an HNiJ
Model 101 PID equipped with a 10.2 eV lamp and calibrated for direct readings in parts per
million (ppm) volume/volume of benzene. The soil vapor samples were analyzed using jaz
headspace analysis in accordance with MPCA guidelines. According to MPCA guidance
? documents, PID measurements above background (0.0 ppm) in soils sunounding the fuel oil,
waste oil, or diesel USTs and above 10 ppm in soils surrounding the gasoline USTs are
? considered contaminated.
? PID readings ranged from 0.0 to 1.0 ppm during the excavation of UST 3, 1.0 to 585 ppm
during the excavations of USTs 4, 5, and 6, and 0.0 to 22 ppm during the removal of the
t dispensers and lines. The highest readings were recorded in soils sunounding the waste oil
tank and the gasoline tank. The soil vapor locations are shown in Figures 4 and 5, and the
? PID readings aze presented in the MPCA's Excavation Report form included in Appendix A.
? During the excavation of UST 7, a 560-gallon waste oil tank located on the southwest corner
? of the Vehicle Service Center, a gas line was ruptured west of the tank and further soil
excavation was immediately stopped. Dirk House, from the Eagan Fire Department,
recommended abandoning the tank in-situ to insure the integrity of gas and sewer lines
? located in proximity of the tank. Two headspace samples were taken and the PID readings
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' of both samples were 1.0 ppm. Due to the low PID readings excavated soils were returned
? to the basin.
? All five USTs were cathodically protected and coated steP1 tanks. UST 3 was in good
condition with no visible holes or pitting. USTs 4 and 5 were in fair condition with no
visible holes, but exhibited some pitting and corrosion. UST 6 was in poor condi6on with
? visible pitting and corrosion; a few'h- to V4-inch holes were observed along the tank bottom.
? The baclfill material within the UST 4, 5, and 6 basin and the UST 3 basin consisted of silty
sand; the native soils within both basins consisted of clay. The dimensions of the two
? excavations are as follows: the UST 3 basin was approximately 22 feet long by 12 feet wide
by 8.5 feet deep; and the UST 4, 5, and 6 basin was approximately 35.5 feet long by 22 feet
, wide by 11.5 feet deep. The limits of the excavations are shown in Figures 4 and 5.
Approximately 35 cubic yazds of contaminated soils were removed from the UST 3 basin and
' approximately 400 cubic yazds of contaminated soils were removed from the UST 4, 5, and
6 basin.
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3.2.2 Analytical Results
Soil samples were collected from the UST 3 basin, the UST 4, 5, and 6 basin, and associated
t stockpiles and submitted to a laboratory for chemical analysis. 1fie analytical results are
presented in Table 3 and the soil sample locations aze shown in Figures 6 and 7. This
? information is also presented in the Faccavation report included in Appendix A.
? One soil sample, SS-47, was collected from the bottom center of the UST 3 basin after
excavation of the tank and contaminated soil was completed to represent the final extent of
? the excavation. The sample was submitted to the laboratory for analysis for BETX and TH
? as fuel oil. Laboratory analysis detected toluene at a concentration of 0.026 ppm.
? Three (3) soil samples were collected from the UST 4, 5, and 6 basin, one from directly
below the center of each tank. The three bottom samples were collected after excavation of
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? the tanks and contaminated soil was completed to represent the final extent of the excavation.
? Soil sample SS-28, collected from below the gasoline tank (UST 4) was analyzed for BETX,
MTBE, and 1Ti as gasoline. Low concentrations of BETX were detected in this sample.
? Sample SS-38, collected from below the diesel tank (UST 5), was analyzed for BETX and
TH as fuel oil. Low concentrations of ethylbenzene and xylenes were defected in sample
? SS-38. Sample SS-46, collected from below the waste oii tank (UST 6) was analyzed for ,
VOCs, TH as fuel oil, lead, cadmium, chromium, and PCBs. Lead, cadmium, and
? chromium were all detected within the common range of concentrations in natural soils. No
petroleum cons6tuents were detected in sample SS-46; however, 1;1,1-trichlorcethane was
? detected at 1.1 ppb, but this analyte was also detected in a laboratory blank.
? Three (3) soil samples were collected following the removal of the pump island dispensers,
one from below the south dispenser, SS-70, one three feet west of the south dispenser,
/ SS-71, and one below the north dispenser, SS-74. Soil sample SS-70 was analyzed for
BETX, MTBE, and TH as gasoline and fuel oil. Laboratory analysis detected TH as !/2 fuel
? oil at a concentration of 280 ppm. Sample SS-71 was analyzed for BETX, MTBE, and TH
as gasoline, and sample SS-74 was analyzed for BETX and TH as fuel oil. No petroleum
? constituents were detected in samples SS-71 or SS-74.
, Soil samples SS-2, SS-3, SS-4, and SS-23 were collected from stockpiled soil removed from
the UST 3 basin and from the UST 4, 5, and 6 basin and were submitted to a laboratory for
? chemical analysis. Laboratory analysis detected elevated concentrations of petroleum
constituents in sample SS-4 and low levels in SS-3. No petroleum constituents were detected
? in samples SS-2 or SS-23.
3.3 Tank Di=sal and Soil Treatment
? Laboratory analysis of samples collected from soils excavated from the "Process Building
? Area" detected only low concentrations of TH as fuel oil in one sample; but, PID readings
were recorded up to 300 ppm and the soils were heavily stained and had a strong petroleum
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? odor. These soils were therefore treated along with soils excavated from the "Vehicle
? Service Center Area," with the approval of the MPCA.
? The six USTs were disposed by Pump and Meter Service. Approximately 510 cubic yards of
conta.minated soils from the tank excavations were transported off site by Pump and Meter
? Service for land application on the Melvin Pommerening property in Dakota County. The
MPCA approved the land application of this soil on September 17, 1991, and the soil was
? spread on September 25, 1991. Three composite soil samples were collected from the land
application site on May 28, 1992. Laboratory analysis detected TH as gasoline in sample
number K205283 at a concentration of 1.2 ppm, which is below the MPCA action level of
? 10 ppm for continued monitoring. No TH was detected in the remaining samples. The
? MPCA approval letter for land application of the soil and the soil monitoring results are
included in Appendix C.
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1 4.0 REMEDIAL INVF.STIGATION RESULTS
? Three soil borings were advanced to a depth of 25.5 feet at the U.S. Postal Service Bulk
? Mail Center to define the vertical and horizontal extent of hydrocarbon contamination
detected during the removal of the six USTs. The remediai investigation was conducted
? within the "Vehicle Service Center Area" due to elevated levels of TH as fuel oil detected in
SS-70 collected beneath the south dispenser.
, 4.1 Regional Geology and Hydrology
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According to the Dakota County Minnesota Geologic Atlas C-6, the region is underlain by
? Quaternary glacial deposits from the Des Moine and Superior Labes. The surficial deposits
consist of mixed till which is composed of an unsorted mixture of clay, silt, sand, and
? gravel. Bedrock in this region ranges from the Prairie du Chien Group to the Jordan
Sandstone and is found at a depth of 350 to 400 feet, respecrively, below ground surface.
? The Cambrian Jordan Sandstone is a medium- to coarse-grained sandstone ranging in
thickness from 70 to 125 feet. Overlying the Jordan Sandstone is the Ordovician Prairie du
i Chien Group comprised mainly of dolomite, and ranges in thickness from 145 to 300 feet.
Due to the lack of a confining bed between them, the Prairie du Chien-Jordan aquifers act as
? one aquifer over a large region. According to the Geologic Adas, the potentiometric surface
lies at approximately 850 to 860 feet above the National Vertical Datum of 1929 (NGVD-
? 29); and according to the USGS St. Paul Quadrangle topographic map the ground elevation
at the site is approximately 900 feet above NGVD-29. The assumed groundwater flow
direction is west-northwest toward the Minnesota River.
1 4.2 Soil Borings
? On October 24, 1991, Exploration Technology, Inc. (ETI), under the direction of DPRA,
? advanced three standard penetration soil borings, B-1, B-2, and B-3, to approximately 25.5
feet below the ground surface. Soil boring B-1 was advanced north of the pump island.
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?dispensers, B-2 was advanced on the east side of the dispenser island, and B-3 was advanced
? on the east side of the UST 47 5, and 6 basin. The soil profiles of the three borings
consisted of 25 feet of clay with silt and some gravel. No groundwater was encountered. A
t map showing the soil boring locations is included as Figure 8.
1 4.2.1 Soil Screening
As the soil borings were advanced, split spoon samples were recovered at five-foot intervals
and screened with an HNLT Model 101 PID equipped with a 10.2 eV lamp. The HNU was
calibrated for direct readings in parts per million (volume per volume) of benzene. PID
readings from the headspace of the soil samples are presented in Table 4 and on the boring
I logs in Appendix D.
? Headspace sample B-3 (24 to 25.5 feet) registered a PID reading of 3 ppm. No organic
vapors were detected in the other headspace samples.
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4.2.2 Analytical Laboratory Results ?
Soil samples recovered from a depth of 24 to 25.5 feet from each boring and one soil sample
? collected from a depth of 14 to 15.5 feet from boring B-3, were submittad to a laboratory for
chemical analysis. All soil samples were analyzed for BETX, TH as fuel oil and gasoline,
? and MTBE. The analytical results of all soil samples are presented in Table 5.
? There were no constituents detected in the samples collected from the three borings. The
laboratory reports and chain-of-custody forms for all sampling events are included in
? Appendix D.
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? 4.3 Hand Auger Borings
? On May 11, 1992, DPRA advanced two hand auger borings, B-4 and B-5, within the
? proximity of UST 7, a closed-in-place 560-gallon waste-oil tank on the southwest corner of
- the Vehicle Service Center. Soil boring B-4 was advanced on the south end of UST 7 to
? approximately 6 feet below ground surface, and B-5 was advanced on. the north end of
UST 7 to approximately 7.5 feet below ground surface. Soils consisted of silty sands and .
? sandy clays. Perched groundwater was encountered at approximately seven feet below
ground surface in soil boring B-5; however, the amount of groundwater encountered was
? insufficient to collect a sample. A map showing the soil boring locations is included as
Figure 9.
4.3.1 Soil Screening
As the hand auger borings were advanced, split-spoon samples were recovered at one-foot
? intervals and screened with an HNU Model 101 PID equipped with a 10.2 eV lamp. The
HNU was calibrated for direct reading in parts per million (volume/volume) of benzene.
PID readings ranged from 1.2 to 4.2 ppm in the two hand-auger borings. PID readings from
the headspace of the soil vapor samples are presented in Table 4 and on the boring logs in
? Appendix D.
1 4.3.2 Analytical Laboratory Results
? Soil samples recovered from five to six feet in soil boring B-4, and six to seven feet in soil
boring B-5, were collected and submitted to a laboratory for chemical analysis for VOCs,
? PCBs, TH as fuel oil, chromium, cadmium, and lead. The analytical results of all soil
? samples are presented in Table 5.
? Analysis of the soil samples detected toluene at 3 ppm, lead at 5 ppm, and chromium at 13
ppm in soil sample B-4; and lead at 7.5 ppm and chromium at 13 ppm in soil sample B-5.
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? In addition, methylene chloride was detected at 5 ppm in B4 and 3 ppm in B-5. The
Minnesota Department of Health (MDH) Recommended Allowable Limit (RAL) for drinking
? water for toluene is 1 ppm and the MDH RAL for methylene chloride is 50 ppm. The
? detected lead concentrations aze withir? the common range found in naturat soils. No 1'H as
fuel oil, PCBs, or cadmium were detected. The laboratory reports and chain-of-custody
r forms for all sampling events aze included in Appendix D.
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1 SA DISCUSSION
A hydrocarbon release was detected on site during the excavation and removal of six USTs
between July 10 and August 13, 1991. Laboratory analysis of soil samples collected from
the UST basins after eaccavations were completed detected no consfituents in the UST 1 and
UST 2 basins located north of the Process Building. In the Vehicle Service Center Area,
laboratory analysis detected low concentrations of toluene in the UST 3 basin, low
concentrations of BETX in the UST 4, 5, and 6 basin, and elevated levels of TH as #2 fuel
oil beneath the south pump isiand dispenser. The most contaminated sample was collected
below the south dispenser three feet below ground surface where laboratory analysis detected
TH as #2 fuel oil at 280 ppm.
Three soil borings were advanced to a depth of 25.5 feet to document the extent of petroleum
? contamination remaining at the site in the Vehicle Service Center Area. Chemical anal.ysis of
samples submitted to a laboratory detected no petroleum constituents in samples collected
? from the soil borings. The horizontal extent of soil contamination is believed to be limited to
the area around the former UST basins, and the sources of contamination and the most
? heavily contaminated soils were removed.
? Two hand auger borings were advanced at the north and south ends of UST 7, a 560-gallon
waste oil tank closed in place, and soil samples were collected from depths of five to seven
feet below ground surface. Chemical analysis of the two soil samples submitted to the
laboratory detected toluene at 3 ppm in B-4 and methylene chloride at 5 ppm in B-4 and at
? 3 ppm in B-5. Because there are no published action levels for volatile organic compounds
in soil, the following discussion includes a comparison of toluene and methylene chloride
? concentrations with the Minnesota Department of Health (MDH) recommended Allowable
? Limits (RALs) for drinking water. The toluene concentration detected is 2 ppm above the
MDH RAL for drinking water and the methylene chloride concentration is 45 to 47 ppm
below the RAL. Lead and chromium were detected at concentrations within the common
levels found in natural soils.
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? No total hydrocarbons were detected in either boring. According to the MPCA guidance
document, "Excavation of Petroleum Contaminated Soil" dated May 1992, no additional
? investigation is required if laboratory analysis detects total hydrocarbons at a concentration of
? less than 100 ppm in clay soil.
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I A hydrogeological survey conducted as part of the RI indicates that soils underlying the site
- are composed of glacial till and the water table is approximately 50 feet below ground
? surface. Soil borings advanced at the site indicated the presence of clay from the surface to
the bottom of the borings at a depth of 25.5 feet below ground surface. The presence of clay
? underlying the site will inhibit the relatively low concentrations of petroleum constituents
detected from migrating to the groundwater.
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6.0 CONCLUSIONS
Based on the information obtained during the remedial investigation, the following
conclusions were made:
1. A hydrocarbon release has occurred in the Vehicle Service Center Area.
2. The sources of contamination and most heavily contaminated soils were
removed during UST removal.
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3. Analysis of soil samples collected from the advancement of five soil borings
indicates the horizontal eztent of contamination is limited to an azea around the
UST basins.
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4. The presence of clay underlying the site will inhibit the migration of petroleum
contaminants to the groundwater. The depth to the groundwater table is
estimated to be approximately 50 feet below ground surface.
5. No total hydrocarbons (T'H) were detected in the five soil borings. According
to the MPCA guidance document, "Excavation of Petroleum Contaminated
Soil" dated May 1992, no additional investigation is necessary if laboratory
analysis detects TH at a concentration of less than 100 ppm in clay.
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6. The petroleum release encountered at this site dces not appear to be a threat to
the public health and welfaze or to the environment.
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7.0 RECOMMENDATIONS
? Because the petroleum release encountered at this site dces not appear to be a threat to the
? public health and welfare or to the environment, DPRA recommends no further action in
regard to the underground storage tanks.
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8.0 STANDARD OF CARE
The recommendations contained in this report represent our professional opinions. These
opinions were arrived at in accordance with currenfly accepted geologic, hydrogeologic, and
engineering practices at this time and location. Other than this, no warranty is implied or
intended.
1 r -} ?
Prepared by:
Audrey J. Luebecia
Associate Geo-En neer
Reviewed by:
Dated: I L 3 ? ', ?Z'
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Senior Civil Engineer
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LIST OF FIGU.RES
FIGURE 1- SITE LOCATION MAP
FIGURE 2 - SITE MAP
FIGURE 3- UTILITY LOCATIONS, PROCESS BUILDING AR.EA
FIGURE 4- UTILITY LOCATIONS, VEHICLE SERVICE CENTER AREA
FIGURE 5- SOIL VAPOR AND SAMPLE LOCATIONS, USTs 1 AND 2
FIGURE 6- SOIL VAPOR AND SAMPLE LOCATIONS, UST 3
FIGURE 7- SOIL VAPOR AND SAMPLE LOCATIONS, USTs 4, 5, AND 6
FIGURE S- SOIL VAPOR LOCATIONS, UST 7
FIGURE 9- SOIL BORING LOCATIONS
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FlGURE 1
0. 2000'
MINN. ?TE LOG7fON I?AAP
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BULK MAIL CEM'ER
VAD R 3165 S. LEXINGTON AVE
I Q
ANGLE LOCATION
sr. PAuL sw, bpNNESOTA EAGAN, MINNESOTA pRO,1ECT NO. 3147.038
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LEGEFD
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EXCAYATION
usT2 + LIGHTPOST
-- SaN -- SANITAAYSEWER
? `.
5T --
STORM SEWER
?3' -- -W- -- WATER
,..
_p_ ._,?_.. FIRE
;r
_ _ --- ?? -------
_
GA5
' il --....?....--- ELECTRIC
y
CONCRETE AREA
BULK MAIL CEMER PROCESS BUILDING
l>-,.. ' tY
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; ABPMALT LL . W._... ,.,- .
N
o so toa
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SCAI.E IN FEET
HEATING QIL SUPPLY AND RETURN LINES
LEGENQ
M bIIJWATEASEPARATOR
? CATCH BASIN
U5T
EXCAVATION
---sAti-- SANITARY SEWER
ASPHuT ------;r-,--- STORM SEINER
_.......,....w...._..._.,.. . WATER
_.........F..........,_ . FIRE
GAS
- ---rM?--- ELECTRIC
e
NOTE: 1,PPROXIMATE BUILDING AND UTILITY LOCATIONS. CALL LOCAL UTILITY
OPERATOR TO YERIFY UTILITIES BEiORE STARTING ANY SUBSURFACE WORK.
0 $0' 40'
SCALE IN FEET
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VEHICLE
SERYICE
CENTEA
S
DIEBELDISPENSER
/ ( } \
SW,???. LJ?`5Y•74,SS-14 a r pUMPISLAND(UNDERCANOPV)
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SY?50,51,54 ? I
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SW71, SS•711 HA?SV•70, SS•70
I L? GASOLINEDISPENSER
SV-9 SV 39 SV-40 r- SV•28, SS-48
SV-33
SV-11------- ---SY-4A
iQ S4- -27 SV•25 C, SV-41
?SV•13 IL Z? i ;
- i G SV•28 ?
'-------------------'
5V•7 5Y•12
? a
? SV•10, - - SV-38,
5S•38 ----SV-2---5V-41
54 ?-? _ 14 ? SV•49 ? G ?
?
-------- p - ^ ---- SV•37
? ? SV•3 ? !
? ??? ? ?-UST4,5@6BASIN
' SV-31 5Y•31 ?
v p G ?
? SV'46, SW34,35
SS-48 A
15 p ?LiSY•1 S4•36
d SV-45
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SV-6 ?
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SV-44 ?I
o 1a sa'
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SCALEINFEET
LEGEND
U 501L UAPOR SAMPLE
A YAPOR AND SOIL SAMPLE
i` USTAREA
`---
E-1 EXCAVATION
NOTE; APPRO%1MATE BWLDING AND UTILITY LOCATIONS. CAII
60PHER STATE TO VERIFY UTILITIES BEFORE STARTING ANY
SUBSURFACE'NdR1C.
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LIST OF TABLES
, TABLE 1- SUMMARY OF USTs CLOSED
TABLE 2- NONAQUEOUS ANALYTICAL RESULTS - UST EXCAVATIONS -
PROCESS BUILDING AREA
TABLE 3- NONAQUEOUS ANALYTICAL RESULTS - UST EXCAVATIONS -
' VEHICLE SERVICE AREA
TABLE 4 - PID MEASUREMENTS
' TABLE 5- NONAQUEOUS ANALYTICAL RESULTS
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TABLE 1
SUMMARY OF USTs CLOSED
U.S. Postal Service Bulk Mail Center
3165 Soutit Lexington Avenue
Eagan, Minnesota
UST Capacity
No. (gallons) C nten T= Location Status
1 19,000 Heating Oil Steel Process Building Area Removed
2 19,000 Heating Oil Steel Process Building Area Removed
3 2,000 Heating Oil Steel Vehicle Service Center Area Removed
4 4,000 Gasoline Steel Vehicle Service Center Area Removed
5 4,000 Diesel Steel Vehicle Service Center Area Removed
6 560 Waste Oil Steel Vehicle Service Center Area Removed
7 560 Waste Oil Steel Vehicle Service Center Area Closed In Place
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TABLE 2
NONAQUEOUS ANALYTICAL RESULTS - UST EXCAVATIONS
PROCESS BUILDING AREA
U.S. Postal Service Bulk Mail Center
3165 South I.exingWn Avenue
Eagan, Minnesota
TH as
k2
Sample Ethyl- TH as Fuel
Depth Benzene benzene Toluene Xylenes MTBE Gasoline OiI Meta[s PCBs
Samnle feet m¢/kg Mgft me/kE ?/kg melkgr gg mglg mY/kY mQ?Q
UST 1
SS-6 11 ND ND ND ND --- --- ND -- --
SS-7 11 ND ND ND ND -- --- ND -- --
SS-8 16.5 ND ND ND ND -- -- ND --- ---
SS-9 16.5 ND ND ND ND --- --- ND --- --
55-10 11 ND ND ND ND --- --- ND --- --
UST 2
SS-11 15 ND ND ND ND --- --- ND --- ---
SS-17 15 ND ND ND ND --- --- ND --- ---
PIPE LINES
P-1 7 0A10 ND ND ND -- --- ND --- ---
P-2 7 ND ND ND ND -- --- ND --- ---
P-3 7 0.010 ND ND ND --- --- ND - _-
STOCKPILE
SP-1 SP ND ND ND ND -- --- ND --- ---
SP-2 SP ND ND ND ND -- -- 3.0 -- ---
SS-19 SP ND ND ND ND -- -- ND -- ---
MTBE = Methyl TeRiary Butyl Ether
mg/kg = Milligrams per kilogram which is equivalent to parts per million (ppm)
T'H = Total Hydrocarbons
ND = Analyzed but not detected above method detection limits
SP = Stockpile
-- = Not analyzed _
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TABLE 3
NONAQUEOUS ANALYTICAL RESULTS - UST EXCAVATIONS
VEHICLE SERVICE CENTER AREA
U.S. Postal Service Bu1k Mai1 Center
3165 South Lezington Avenue
Eagan, Minnesota
TH as
/!2
Sample Ethyl- TH as Fuel
Depth $enzene benzene Toluene Xylenes MTBE Gasoliae Oil Metals PCBs
Samnle feet me/ka me/ke me/ke me/ke me/k¢ m¢/ke mE/kP IDQ/kQ metkg
UST 3
SS-47 8.5 ND ND 0.026 ND --- -- ND --- ---
UST 4
SS-28 11 0.025 0.010 0.048 0.070 ND ND - -- ---
UST 5
5S-38 11 ND 0.037 ND 0.026 --- --- ND --- ---
UST 6
SS-46 11 ND ND ND ND --- --- ND 8.2(Pb) ND
0.84(Cd)
18(Cr)
PUMP ISLAND
SS-70 3 ND ND ND ND ND B
S5-71 3 ND ND ND ND ND ND
SS-74 3 ND ND ND ND -- ---
STOCKPILE
SS-2 SP ND ND ND ND --- ---
SS-3 SP ND 0.095 0.40 0.74 --- ---
SS-4 SP 0.33 22 3.7 200 1.4 740
SS-23 SP ND ND ND ND --- ---
MTBE = Methyl Tertiary Butyl Ether
TH = Total Hydrocarbons
mg/kg = Milligrams per kilogram which is equivalent to parts per million (ppm)
B = Unable to quantify due to the presence of fuel oil
ND = Analyzed but not detected above method detection limits
SP = Stockpile
-- = Not analyzed
280
ND
ND 8.6(Pb) ND
0.86(Cd)
9.9(Cr)
13 --- ---
ND -- ---
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TABLE 4
PID MEASUREMENTS
U.S. Postal Service Bulk Mail Center
3165 South I.exington Avenue
Eagan, Minnesota
PID(')
Sample Depth Readings
Soil Borine Date Measured (fcet) (nm)
B-1 10/24/91 4- 5.5 ND
9 - 10.5 ND
14 - 15.5 ND
19 - 20.5 ND
24 - 25.5 ND
B-2 10/24/91 4- 5.5 ND
9 - 10.5 ND
14 - 15.5 ND
19 - 20.5 ND
24 - 25.5 ND
B-3 10/24/91 4- 5.5 ND
9 - 10.5 ND
14 - 15.5 ND
19 - 20. S ND
24 - 25.5 3.0
B-4 05/11/92 1-2 4.2
4-5 2.0
5-6 3.8
B-5 05/11/92 3- 4 3.8
5-6 2.0
6-7 1.2
(') Above background levels.
ppm = parts per million
ND = Analyzed bet not detected above method detection limits
m m m m m m m ? m " m m m m m m m m m
TABLE 5
NONAQUEOUS ANALYTICAL RESULTS
U.S. Postal Service Bulk Mail Center
3165 South Lexington Avenue
Eagan, Minnesota
Ethyl- TH as TH as
Date Depth Benzene benzene Toluene Xylenes MTBE Gasoline FuelOil PCBs
Sample SamPled feet me/k¢ me/k¢ me/ke me/kc me/ke m¢/k¢ IDQ/kP me/ka
B-1 10124f91 24 - 25.5 ND ND ND ND ND ND ND ---
B-2 10/24l91 24 - 25.5 ND ND ND ND ND ND ND ---
B-3 10l24/91 14 - 15.5 ND ND ND ND ND ND ND ---
B3 10l24/91 24 - 25.5 ND ND ND ND ND ND ND ---
B-4 05/11/92 5- 6 ND ND 3 ND ND --- ND ND
B-5 05l11/92 6-7 ND ND ND ND ND --- ND ND
MTBE = Methyl Tertiary Butyl Ether
TH = Total Hydrocarbons
mg/kg = Milligrams per kilogram which is equiva}ent to parts per million (ppm)
ND = Analyzed but not detected above method detection limits
--- = Not analyzed
Metals
me/ke
ND(Cd)
13(Cr)
5(Pb)
ND(Cd)
13(Cr)
7.5(Pb)
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' UNITED STATES POSTAL SERYICE
BULK MAIL CENTER
'
FIRE SPRINKLER MUQIFICATIONS
' ST. PAUL, MN
JUNE 13, 1990
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PREPARED BY:
' ORR-SCHELEN-MAYERUN & ASSOCIATES, INC.
2021 East Hennepin Avenue
Suite 238
' Minneapolis, MN 55403
(612) 331-8660
' OSM Cortunission #4575.01
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Schelen
QS 07
Mayeron &
Associates, inc.
June 13, 1990
Mr. Michael J. Schech
UNITED STATES POSTAL SERVICE
TWIN CITIES DIVISION SUPPORT SERVICES
180 East Kellogg Boulevard
Suite 603
St. Paul, MN 55101-9991
RE: USPS BULK MAIL CENTER-SPRINKLER MODIFICATIONS
OSM Commission #4575.01
2021 Eas[ Hennepin nvenue
Minneapolis, MN 55413
612-33I-8660
FAX 331-3806
Engineers
Surveyors
Planners
' Dear Mr. Schech:
Enclosed are two(2) copies of the report identifying the Fire Sprinkler
t Modifications for the above referenced facility. The packages consist of sketches
and instructions to make the Fire Sprinkler changes as required by the addition of
new Container Loaders and Parcel Slides.
' An additional copy has been forwarded to Larry Hoglin for his review.
Dale Wegleitner, City of Eagan Fire Marshall, had also requested that we send him a
' copy for their records. Bill Bruestle, City of Eagan Lead Building Inspector, and
Mr. Wegleitner were consulted in the preparation of this report. They visited the
site on May 29, 1990 and met with Mr. Hoglund and myself.
' If you have any questions, please call.
Respectfully,
' ORR-SCHELEN-MAYERON
& ASSOCIATES, INC.
v?-
9
' Linda J. Pederson, P.E.
LJP:syb
' 6/90-23j
cc: Dale Wegleitner /CITY OF EAGAN JJS
' Larry Hoglin FILE
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I hereby certify that this plan, specification or report
was prepared by me or under my direct supervision and
that I am a duly Registered Professional Engineer under
the laws of the State of Minnesota.
Date : ('11319p
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Reg. No. 14408
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asssaaaaa=asasma=m?saaazaa
I GENERAL
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1. All designs, work and materials shall conform to the latest applicable editions
of the National Fire Protection Assocation (NFPA) Standards and applicable
State codes, whether the stipulations therein are stated as positive
requirements or as recommendations. Additionally, all equipment, materials and
installations shall comply with the Factory Mutual "Approval Guide" as well as
all governing Local regulations.
2. Sprinkler piping material is to be schedule 40 steel pipe as approved by NFPA,
UL and all applicable Local codes.
3. Sprinkler head types shall be:
Standard, automatic upright sprinkler with 1/2" orifice and fusible link.
Temperature rating shall be 165 degrees Fahrenheit.
The Installer is to provide the Owner with six (6) spare replacement heads each
type of sprinkler head installed.
4. All dimensions shall be field-verified at the site prior to fabrication.
5. CLEANING - Flush out all new piping systems with water until the discharge runs
clear. The flow of water shall be sufficient to attain line velocities of 5-6
feet per second. Flushing shall be in accordance with NFPA 13. Where the
System is connected to the existing building main, the Contractor shall also
flush the existing mains.
6. TESTS - Fill the piping sections with water. Open the air vents or other
outlets, as necessary, to expel entrapped air. Hydraulically test all piping
at 200 psig for a period of at least 2 hours. Correct any defective joints and
retest. Measure the hydrostatic pressure at the low point of each System or
zone being tested.
7. The Installer is responsible for all patching and repair of existing Facilities
affected by this work.
8. Work Schedules are to be coordinated with the owner.
9. Installer is responsible for obtaining all applicable permits.
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