HomeMy WebLinkAboutRemedial Investigation/recommended action-1995� �
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REMEDIAI. INVESTIGATION AND
'� RECOMMENDED CORRECTIVE ACTION REPORT
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SAILrJRS WORLD, INC.
� CRYSTAL BAY, MINNESOTA
MPCA LEAK ID#: LEAK00005492
;� SUNIMIT PROJECT NO. 922030
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� Environmental Engineering and Consulting Services
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� REMEDIAL INVESTIGATION AND
RECOMMENDED CORRECTIVE ACTTON REPORT
� Sailors World, Inc.
Crystal Bay, Minnesota .
� MPCA Leak ID#: LEAK00005492
Summit Project No. 922030
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Prepared By:
� Summit Envirosolutions, Inc.
,� 10201 Wayzata Boulevard, Suite 100
, Minneapolis,lVlinnesota 55305
� (612) 595-8888
� October 5, 1995 '
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REMEDIAL INVESTIGATION
� AND REC0IVIlVIENDED CORRECTIVE ACTION REPORT
SAILORS WORLD, INC.
� CRYSTAL BAY, MINNESOTA
MPCA LEAK ID#: LEAK00005492
� SUMIVIIT PROJECT NO. 922030 �
� 1.0 EXECUTIVE SUMMARY
Summit Envirosolutions, Inc. has completed a remedial investigation and recommended
� - con'ective action report for the subject site. Data collected during this assessment indicates
corrective actions completed to date have sufficiently addressed the release of petroleum
� hydrocarbons and reduced the impacts to potential receptors. Therefore, Summit
s
Envirosolutions, Inc. does not recommend additional assessment or corrective actions at this
time.
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2.0 INTRODUCTION
� 2.1 Purpose and Scope
� The purpose of this report is to present the results of subsurface assessment activities and
corrective actions associated with impacts of a release of gasoline from an underground storage
tank (UST) formerly located at the Sailors World Marina (Sailors World) site. This report was
� prepared following Minnesota Pollution Control Agency (MPCA) petroleum tank release
guidelines. The MPCA identification number assigned to this site is LEAK00005492. This
report is intended to fulfill MPCA Remedial Investigation/Corrective Action Design objectives
� and reporting requirements.
To accomplish these objectives, Summit Envirosolutions, Inc. (Summit) completed the following
� tasks:
� • Reviewed field notes from Foth & Van Dyke regazding the previous
excavation activities performed by Griggs Contracting on August 3 and 4,
1992, and drilling logs from a geotechnical report prepared by GME
� Consultants, Inc. dated August 25, 1992; ,
• Observed the removal of one UST, coordinated excavation of additional
! petroleum impacted soil, and completed three hand auger borings on
� August 13, 1992; .
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� � Sailors World, Inc.
' Summit Project No. 922030
� October 5, 1995
Page 2
� - • Completed eight Geoprobe�test probes at the site on June 15, 1994;
[� • Completed an additional four Geoprobe� test probes at the site and three
�� test probes off site on June 2, 1995; .
� • Collected and analyzed groundwater and soil samples from test probe
locations for concentrations of petroleum hydrocarbons; selected soil
samples were analyzed for lead;
� Collected and analyzed groundwater sam les from the o - '
' p n site water supply �
well on two occasions; and '
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• Prepared this report that summarizes the results of the assessment and
� remedial actions performed, and presents conclusions and ,
recommendations.
'-„ 2.2 Background Information
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The soil conditions at the site have been altered over the years according to a memo received
� from our client, Mr. Gary De Santis, dated April 4, 1995 (Appendix n. Based on this memo,
large amounts of fill have been periodically placed in the area to create conditions necessary for
commercial development.
� The property currently occupied by Sailors World has been transferred nume
rous times; the most
recent transfer has resulted in delays in completing the remedial investigation. A summary of
� historical ownership of the property has been provided by Mr. De Santis and is also included in
Appendix I.
� According to the field notes prepared by Foth & Van Dyke, excavation activities performed by
Griggs Contracting were observed by Foth & Van Dyke personnel on August 3 and 4, 1992. At
that time, two USTs existed on the site (see Excavation Report in Appendix II). The 3,000-
� gallon capacity UST contained unleaded gasoline; the other UST (4,000-gallon capacity) liad
been out of service for several years and had also been used for storage of gasoline in the past.
� Petroleum hydrocarbon impacted soil was encountered during the construction of a new club
house and approximately 60 cubic yards of impacted soil were removed at that time.
� A geotechnical report, which included drilling logs for two (relatively deep) test borings, was
prepared by GME Consultants, Inc., dated August 25, 1992. The test boring logs are included in
Appendix III. The two test borings were completed on August 19, 1992 near the north and south
� comers of the (at that time) proposed club house building. The test boring logs indicated the
presence of approximately 8 feet of fill overlying silry clay and clayey silt to 77 feet below
ground surface.
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� Sailors World, Inc.
Summit Project No. 922030
� October 5, 1995
Page 3
� 2.3 Site Location and Description
� The subject site is located on County Road 15, approximately S miles west of Wayzata,
Minnesota. The site is located in the SEl/a of the SWt/a of the NWl/a of the SEl/a of Section 10,
Township 117 North, Range 23 West, in Hennepin Counry (Figure 1). Site structures and
� features include a club house building, several temporary garage units, and an asphalt pazking lot
used for boat storage and vehicle pazking. It is Summit's understanding that a geotextile-type
liner underlies the parking lot to control watei. .
� The area surroundin the site consists of Lake
g Minnetonka to the northeast and southeast, a
former commercial business to the southwest, and a residential area to the northwest (Figures 1
� and 2). According to Mr. De Santis, the former business located to the southwest was at one
time a gasoline station, and was more recently converted to a transmission repair service station.
The building appeared to be abandoned and inactive during recent site visits performed by
� Summit.
� A water supply well is located approximately 20 feet southwest of the club house (Figure 3). A
� well log for this well was not available. According to Mr. De Santis, the water well on his
property was constructed approximately 25 years ago and is estimated to be 240 feet deep.
� 2.4 Regional Geology and Hydrogeology
� Su�cial deposits underlying the site consist predominately of lacustrine sand and loamy sand.
Peat underlies organic-rich loam and manmade beaches in some areas. Underlying this material
is a thick sequence of glacial till that is characteristic of the Lake Minnetonka region. This
� sequence of clay appears to be a confining layer and separates surficial deposits from deeper
glacial deposits and the underlying bedrock. The St. Peter Sandstone Formation is present
beneath the unconsolidated material and is estimated to be 200 to 400 feet below the ground
� ' surface (Balaban, N.H., 1989).
}� 3.0 PROJECT RESULTS
� 3.1 Excavation
On August 13, 1992, Summit personnel observed the removal of a 4,000-gallon capaciry UST
� and approximately 70 cubic yazds of petroleum impacted soil. The location of the excavation is
illustrated on Figure 2. During the excavation, soil samples were screened for indications of
organic vapors using a photoionization detector (PID) equipped with a 10.6 electron volt lamp �
� and calibrated for direct reading in parts per million (ppm) of benzene on a volume basis. The
instrument was calibrated at the beginning of the day using ambient air as zero gas and 100 ppm
isobutylene in air as the calibration gas. Soil samples were screened using a jar headspace
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� Sailors World, Inc.
Summit Project No. 922030 -
� October 5, 1995
Page 4
� method. Generally, soil vapor headspace readings decreased with depth, indicating the majority
of petroleum hydrocarbon impacted soil was present in the upper 4 to 5 feet of soil.
� The excavation was limited in a southeasterly direction because of the presence of underground
utilities (Figure 2). Subsequently, three hand auger borings were completed in an area southeast
� of the excavation. Results of soil headspace screening at these locations indicated soil in this
area was impacted with petroleum hydrocarbons. PID readings at these locations ranged from 66
to 150 ,ppm. Observations recorded during the excavation activities and related laboratory
� , analytical results are included in the attached excavation report(Appendix II).
Impacted soil was transported in May 1993 to C.S. McCrossan, located in Maple Grove,
� Minnesota. A total of 130 cubic yards of impacted soil were thermally treated: 60 cubic yazds
previously removed by Foth & Van Dyke and 70 cubic yards removed under the observation of
Summit.
� 3.2 Test Probes and Site Geology
� On June 15, 1994, eight Geoprobem test probes, P-1 through P-8, were completed and
groundwater samples were collected. Water was not observed at P-7, which was completed to a
� depth of 10 below the ground surface. Probe depths ranged from 5 to 10 feet deep and probe
locations aze illustrated on Figure 2.
� An additional seven Geoprobe� test probes (labeled P-9 through P-15 on Figure 2) were
completed on 7une 2, 1995. Four of these test probes were completed on the property owned by
Sailors World and three probes were completed on the right-of-way of Counry Road 15. A
� Macro-Corem 4-foot long sampling system was utilized to collect soil cores at these test probe
locations. Variable soil types were encountered and soil descriptions included silty clay, sand,
silty sand, and gravel. Much of the soil that was observed may be fill, as indicated by an asphalt
� layer that was encountered at approximately 4 feet below the ground surface at test probe
location P-11. Wet soil was encountered at depths ranging from 1.5 to 5 feet below grade.
Observations at several test probe locations indicated that the soil was not consistently
� "saturated" or wet at depth. "Dry" soil, or soil that appeared to be below saturation, was observed
underlying coarser, wet soil at P-9, P-11, P-12, and P-14. Several probes were completed near
previous probe locations to evaluate movement of hydrocarbons in the subsurface during the past
� year. Probe P-15 was completed in the former UST basin, between the previous probe location
that showed the highest benzene concentrations (P-3) and the probable groundwater discharge
� area(Lake Minnetonka). Geoprobe�test probe logs that contain soil descriptions are included in
Appendix III.
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� Sailors World, Inc.
Summit Project No. 922030
� October 5, 1995
Page 5
� 3.3 Field Screening and Analysis of Soil Samples
� Soil headspace screening was performed at test probe locations P-9 through P-15. During test
probe operations, continuous core samples were screened for indications of organic vapors using
a PID and jar headspace methodology. PID readings were not detected above background levels
� at P-9, P-10, P-11, P-13, and P-14. The PID readings were generally below background levels at
P-15, with a reading of 1 ppm detected at 8 feet below grade. The highest PID reading was
recorded at P-12 (27 ppm), located on the other side of Highway 15, approximately 3 feet below
� the ground surface. Test probe logs containing soil descriptions and soil headspace screening
results are included in Appendix III.
� Chemical analysis of soil samples collected in June 1995 indicated that concentrations of
petroleum h�drocarbons were relatively low or below method detection limits. Six soil samples
were analyzed by an independent laboratory for benzene, toluene, ethylbenzene, total xylenes
� (BTEX), and methyl tertiary butyl ether (MTBE). Additionally, selected soil samples were
submitted for analysis of diesel range organics (DRO) and lead. An additional soil sample was
� analyzed on site using the laboratory equipment within the Geoprobe�van. Three of the six soil
samples had detectable benzene concentrations. However, these concentrations were at or near
the method detection limits, with the highest benzene concentration being detected at P-9 (0.13
� ppm). Similarly, low or non-detectable concentrations of toluene, ethylbenzene, and xylenes
were reported for the soil samples. Concentrations of MTBE were not detected at or above the
method detection limits for the soil samples. Reported DRO concentrations were 42 ppm at P-11
� and 180 ppm at P-12. These two probes were completed on the west side of Highway 15. In
contrast, P-15, which was completed near the former UST, did not contain detectable
concentrations of DRO or gasoline range organics (GRO). As presented in Table 1 and the
� attached laboratory report (Appendix N), results of the chemical analysis performed at P-11 and
P-12 indicate that unidentified components with higher molecular weight than gasoline may be
present in this area. Lead was detected at higher concentrations at P-11 (25 ppm) and P-12 (45
� ppm) than the reported concentration in the area of the tank basin, P-15 (2.5 ppm). The results of
chemical analysis of soil samples are summarized in Tables 1 and 2.
� 3.4 Water Sampling and Analytical Results
During completion of the first round of Geoprobe� test probes in June 1994, groundwater
� samples were collected at test probe locations for chemical analysis, with the exception of P-7
since water was not observed at this test probe location. A water sample was also collected at the
� Sailors World water supply well. Chemical analysis was performed on site using the Geoprobe�
laboratory for BTEX,MTBE, GRO, 1,3,5-trimethylbenzene (TMB), and 1,2,4-TMB.
� A modified version of the State of Wisconsin GRO Method was used to quantify GRO
concentrations in the field utilizing purge-and-trap sample concentration. Soil and groundwater
samples were. concentrated with an OI-Analytical Model 4460A purge-and-trap sample _
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� � Sailors World, Inc.
Summit Project No. 922030
� October 5, 1995
Page 6
� concentrator and transferred directly into the gas chromatograph column via a heated transfer line
for chromatographic sepazation. BTEX and GRO standards were analyzed daily to generate
� -response factors for each analyte. Blank samples were analyzed for approximately 10 percent of
the field samples. Concentrations of benzene above the Minnesota Department of Health Risk
Limit (HRI.) of 10 parts per billion (ppb) were detected at P-3 (829 ppb) and P-4 (224 ppb).
Results of the chemical analysis of groundwater samples collected during this phase of the
�� project are presented in Table 2.
In June 1995, water samples were collected at Geoprobe� test probe locations, the Sailors World
water supply well, and Lake Minnetonka. Seven groundwater samples and one soil sample were
collected at test probe locations P-9 through P-15, and were analyzed on site for BTEX, GRO,
� 1,2,4-TMB and 1,3,5-TMB utilizing the analytical capabilities of the Geoprobe�. Two of these
groundwater samples were split and sent to an independent laboratory for analysis of BTEX,
M'TBE, and GRO. Results indicated benzene concentrations exceed the HRL at P-14 (205 ppb)
� and at the off-site probe location, P-12 (15 ppb). Concentrations of BTEX, NITBE, GRO, 1,3,5-
TMB and 1,2,4-TMB were not detected at P-9, P-10, P-11, or P-13. Low concentrations of
benzene (3.3 ppb) were detected near the former UST basin at P-15. A slight decrease in
� benzene concentrations appears to have occurred during the past year in the area of the probes
that were completed near Lake Minnetonka, P-4 and P-14.
�� A groundwater sample was also collected at the water supply well in June 1995. Analytical
results from samples collected at the water supply well did not indicate the presence of petroleum
� hydrocarbons at or above method detection lirnits.
A surface water sample was collected from Lake Minnetonka from approximately 20 feet from
� shore in June 1995. Concentrations of petroleum hydrocarbons were not detected in the water
sample. A summary of results of chemical analysis performed by the Geoprobe� are included in
Table 2. Table 3 summarizes analysis completed by the laboratory and the laboratory report is
� included in Appendix IV.
3.5 Groundwater Measurements and Hydraulic Properties
� Prior to abandonment of the test robes, roundwater levels were measure
P g d at test probe
locations P-9, P-10, P-11, P-12, and P-14 using an electronic water-level indicator and temporary
� 3/a-inch diameter polyvinyl chloride (PVC) pipe and flush-threaded PVC screens. Groundwater
measurements were made using a Solinst Model 102 water level indicator. According to the
� manufacturer, the accuracy of this instrument is approximately 0.04 foot. However, groundwater
measurements were recorded to the neazest 0.01 foot. The water-level indicator was cleaned
before and after each measurement with a solution of inethanol and water. The depth to water
� within each well was recorded at the time the measurement was completed. Measurements were
obtained by lowering the probe of the water level indicator into the PVC pipe until the device
indicated that the water surface was encountered. The depth to the water surface was then
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Summit Project No..922030
� October 5, 1995
Page 7
� recorded onto a water level form. The completed forms included the following information: the
probe number; the time of the measurement; the date of the measurement; the depth to the
� groundwater surface; the type of ineasuring device used; the initials of the individual collecting
the data; the Summit project number; and the location of the site. The groundwater levels were
measured from a surveyed point at each location: These surveyed points depicted relative
� elevations and were referenced to an on-site concrete slab with an assumed elevation of 100.00
feet.
t� Groundwater elevation data is included in Table 4. These data suggest movement of
` groundwater toward the southeast as exhibited on the groundwater contour map (Figure 3).
Based on the inferred groundwater contours generated, the average horizontal gradient was
� estimated to be approximately 0.01. Hydraulic conductivity of the soil (probable fill) is expected
h to vary widely with respect to transport of groundwater and dissolved petroleum constituents.
� According to Mr. De Santis, the level of Lake Minnetonka was very high in June 1995,
" approximately 6 inches below flood stage. Because the lake level was relatively high and
groundwater elevation data indicated movement toward the lake, groundwater movement away
,� from the Lake does not appear likely. A hydrogeologic setting and groundwater contamination
worksheet are included in Appendix V. .
� 3.6 Receptor Survey
- The purpose of the receptor survey was to identify potential receptors and provide an estimate of
-� the relative risks of adverse impacts to these potential receptors. This assessment evaluated the
following potential receptors: surface water bodies, water wells, utility trenches, and buildings.
� The site is located adjacent to a large surface water body, namely Smith Bay of Lake
Minnetonka. Other surface water bodies within approximately '/z mile of the site include other
� bays to the northeast and southwest and wetlands to the north and west(Figure 1).
Water well records were obtained from the Minnesota Geological Survey as a part of this
� assessment. The well records for the water supply well on the site was not located. The closest
identified wells to the site are Unique Well Numbers 100169 and 205621, located approximately
500 to 1,000 feet west of the site. Both of these wells are used for domestic putposes. Well
'� 100169 is cased to 117 feet below grade and is equipped with a nine foot screen with the bottom
of the screen set at 126 feet below ground surface. Unique Well'Number 205621 has a five-foot
screen set from 215 to 220 feet below grade. Both well logs indicate that at least the upper 125
� feet of soil consists predominantly of clay. A location map for the wells and copies of the well
logs are contained in Appendix VI.
� A vapor survey was performed at accessible sewer manholes, a storm sewer catch basin, and two
residential basements located west of the Sailors World Marina in June 1995..Elevated PID or
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� � Sailors World, Inc.
Summit Project No. 922030
� October 5, 1995
Page 8
� explosive readings were not detected during the survey. Reportedly, the club house building
located on the site does not have a basement. Results of the vapor survey are summarized in
� Table 5. -
� 4.0 DISCUSSION AND CONCLUSIONS
Soil and groundwater conditions at the site vary and fill (sand and clay) appears to be the soil
� rype�present from approximately 3 to 8 feet below the ground surface. As discussed above in
Section 3.2, soil moisture observations recorded for samples collected at this depth varied
considerably based on the probe location and soil type encountered. It appears that the majority
N of petroleum impacted soil was removed during excavation activities. Based on GME
Consultants, Inc. boring logs, well logs, and data collected using the Geoprobe�, fine-grained soil
(clay and silt) is present near the ground surface and predominates to a depth of at least 77 feet.
� Because of the extensive clay/silt soil conditions and observations of what appears to be
unsaturated soil at depth, vertical migration of dissolved petroleum hydrocarbons would be
relatively slow. Movement of groundwater in the horizontal direction appears to be generally
� southeast, toward Lake Minnetonka (Figure 3).
� Analytical chemistry results for groundwater samples collected from Geoprobe� test probe
locations indicated that the concentrations of dissolved petroleum hydrocarbons did not increase
during the period of June 1994 to June 1995 and were generally less than the applicable HRLs.
Of the fifteen probe locations, only four contained concentrations of benzene above HRLs, with
� one of these four being located off site and adjacent to a former gasoline station. Benzene
concentrations above HRLs were detected at P-3 (829 ppb), P-4 (224 ppb), P-12 (15 ppb), and P-
� � 14 (205 ppb). However, concentrations of benzene detected in groundwater samples collected
during this assessment have not exceeded 100 times the HRL and concentrations of toluene,
ethylbenzene, xylenes, MTBE, 1,3,5-TMB, and 1,2,4-TMB were not detected above HRLs at the
� fifteen probe locations. Also, sheens on the water table or free product have not been observed at
the site.
� It appears that surface water has not been significantly impacted by the petroleum hydrocarbons
•detected on the site. Although groundwater movement appears to be toward Lake Minnetonka,
concentrations of petroleum hydrocarbons were not detected in a surface water sample that was
Mcollected approximately 20 feet from shore. Based on information collected and reviewed during
this project, groundwater �with relatively low concentrations of dissolved-phase hydrocarbons
� may seep into Lake Minnetonka. As a conservative estimate, concentrations of dissolved
petroleum hydrocazbons in the groundwater as observed at probe location P-14 (benzene, 205
ppb) may be entenng the Lake through groundwater and surface water interaction. However,
� considering the relatively low concentrations of dissolved petroleum hydrocarbons, the soil rypes
underlying the area, and several processes including photodegradation, volatilization,
evaporation, and dilution, future potential impacts to Lake Minnetanka from the reported
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� • Sailors World, Inc.
Summit Project No. 922030
October 5, 1995
� Page 9
� petroleum hydrocarbons appear to be relative low. Risk to wells,basements, and utilities appears
to be minimal based on groundwater observations and on removal of the source area.
� Results of chemical analysis performed for probe locations on the west side of Highway 15
indicate-the presence of unidentified components with moleculaz weights higher than gasoline.
� Based on the observed groundwater flow characteristics and site history, it appears that these
impacts did not originate at the Sailors World site and are likely a result of previous activities
that may have occurred in the area of the former service station located to the southwest of the
� site.
Considering that corrective action activities completed at the site included removal of 130 cubic
� yazds of petroleum hydrocarbon impacted soil and that the size of the site is relatively small,
these conective actions appear to have effectively reduced the risks of petroleum hydrocarbons
that may affect Lake Minnetonka. Based on results of chemical analysis of groundwater and soil
� samples, the location of identified receptors, and the removal of the source azea, the risk to the
other identified potential receptors appears to be relatively low.
'� 5.0 RECOMMENDATIONS �
� Based on the data collected and reviewed as a part of this assessment, it is our opinion that
additional assessment or corrective actions do not appear to be warranted at this time.
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6.0 REFERENCES
� Balaban, N.H. ed., 1989. Hennepin County Geologic Atlas, Atlas C-4, Minnesota Geological
Survey, St. Paul,Minnesota. . •
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7.0 LIMITATIONS OF ENVIRONMENTAL ASSESSMENTS
� Summit's opinions, conclusions and recommendations were based, in part, on information
Summit obtained and evaluated from current sources that may have included the client, property
� owner, former reports; and private, municipal, state and federal agencies. Verification'of the
authenticity or accuracy of this information is not wazranted by Summit or included in Summit's
scope of services.
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� Sailors World, Inc.
Summit Project No. 922030
� October 5, 1995
Page 10
� This report is based upon our observations made during the site reconnaissance, the information
provided �to us, and the results of analytical sampling. Given the inherent limitations of
environmental assessment work, Summit will not guazantee that the site is free of hazardous or
� potentially hazardous materials or conditions or that latent or undiscovered conditions will not
become evident in the future. This report was prepared in accordance with the proposal, scope of
� work, and Summit's General Conditions and terms, and no other warranties, representations, or
certifications at�made.
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t000grapn c �a �ummit G�NERAL SITE
� quadrangle: ���-�virosotutions LOCATION MAP
� �xceisior, �
' J ��innesota.
,;�� SAILORS WCRLD INC.
lcc^:icn ?utoC�C File: 922030T1
� V Summit Proj. `lo: 922030
a' �00m' 20�0' ;.;�t pate: 08-22-1995 1955 SHORELINE DRIVE
t�innesota � C�C Operator ;N
s�,���: t"=2000' �eviewed oy: Jwe CRYSTAL BAY, MINNESOTA
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i cable � dock
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p_� rump
aSPhalt � i asPhait
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parkinq i , i
area i . i area w�tn
i I i geo[extile
i � llner
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I � P-8
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abandoned MFI,f4 �
building j I i
former p_�2 , �
service ! i P_2 •
stotion i • P_9
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LEGEND
� Geoprobe test pro�e �,_,_� excavation �
O buildinq � manhole �
� - electric line Q catch basin
�retoining watl FIGURE 2
� � fuel line f �
- �„�b -iv ::uminit SITE MAP
/:r Envirosululions
—•— wa�er line ��
- -aDProx. nght of woY �� SAILORS WORLD INC.
� waler suDGly well
QutoCAD Flle: 922030LJ
■ hand Auyer probe Summil Proj.Na: 922030
i ezwstiny �naer9round ��e� tank d 30 Plot Daie: 10-30-1995 1955 SHORELINE DRIVE
r��me. �mdr.gro�na i��t ia��k � c�o operato�: eN CRYSTAL BAY� MINNESOTA
hPPItOX.;CnIE: 1'-30' Reviewea bY: JWB
.w • i /.__�__
I Lake
. Minnelonka
1:
�f
0°
g�avel driaewaY '� \,t
0
_ MHy� oo�a
� o
M�2 I � 9rass
� ` 1 P-7 area
residence I � 1-��. �
i
o`
� o
96.97• CW ouse 'O
� P-10� P-5
P-6
96.81
� P-14
P-4
� dock
� � tank 2 H��■HA_3
_ � � P-15
� -3' c ..,r ■
° � � HA-2
Ir � � ._ 1.. �
� excavotion
o P-13
- 95.7B
(lake level)
c
u h
I �
q .� �....t � m
� �
P-��� � boot
97.?9
, p � romp
asphalt � asphalt
porking � parking
� areo with
area �
geotextilz "
liner
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i m p-g
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abanaone0 MH/N �
building / 97,81 �
former p_�p ,
service I, P-2 • g6.62
station , � P_9
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' Minnetonko
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P
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LEGEND
� Ceoprobe test probe �
�building �
�retaining woll
— °��b �� FIGURE 3
� woter suDP�y well _ grounGwoter elevation in
a test probe location .J
■ naod Auger probe s�•ei .i.,�� Surnrni't GROUNDWATER CONTOUR
r_.� e%Ca a_a� � /�Envirosolutior�s MAP AS OF JUNE 2, 1995
� monhole ��97'0 inferred groundwaler contour �%"'' . .
L_.,� L .__--_�__�t�
Q wtch basin . �.%- direction of groundwater rtow SAILORS WORLD INC.
� � existing unde�9round fuel tonk AutoCAD File: 922030W1 +r
Summil Proj.No: 922030
former ��ae�9�o���a i�ri lank 0 'S0 Ptot Dale: 1N-30--1995 1955 SHORELINE ORIVE
� CAU Operotoc 1N CRYSTAL BAY, MiNNESOTA
APf'I70%.SCPIE 1"..}y' Keviewr.el hy: JWB y