DSHW-2024-005367

CHEVRON PRODUCTS COMPANY
Salt Lake Refinery
Groundwater Analyte List Data Summary
and Groundwater Monitoring Plan
EarthFax Engineering, Inc.
GROUNDWATER ANALYTE LIST
DATA SUMMARY
AND GROUNDWATER MONITORING PLAN
CHEVRON PRODUCTS COMPANY
SALT LAKE REFINERY
SALT LAKE CITY, UTAH
Prepared By
EarthFax Engineering, Inc.
Midvale, Utah
April 1997
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................. 1-1
2.0 SAMPLING HISTORY .................................................................................................... 2-1
2.1 Data Storage ...................................................................................................... 2-1
2.2 Facility Groundwater Monitoring Locations ..................................................... 2-1
2.3 Groundwater Monitoring Programs .................................................................. 2-3
3.0 DATA EVALUATION METHODOLOGIES ..................................................................... 3-1
3.1 Database Inquiries and Procedures ................................................................... 3-1
3.2 Organic Compounds and Metals Evaluation Criteria ....................................... 3-1
3.2.1 Parameters Meeting Criterion Number One .......................................... 3-2
3.2.2 Parameters Meeting Criterion Number Two ........................................ 3-3
3.2.3 Parameters Meeting Criterion Number Three ...................................... 3-5
3.2.4 Parameters Meeting Criterion Number Four ........................................ 3-5
3.3 Deep Aquifer ...................................................................................................... 3-6
4.0 RESULTS ........................................................................................................................ 4-1
4.1 Methods ............................................................................................................. 4-1
4.2 Results ................................................................................................................ 4-2
4.2.1 Metals Requiring No Detailed Evaluation ............................................. 4-3
4.2.2 Beryllium ................................................................................................. 4-4
4.2.3 Cobalt ...................................................................................................... 4-4
4.2.4 Mercury ................................................................................................... 4-5
4.2.5 Nickel ...................................................................................................... 4-5
5.0 MONITORING PLAN .......................................................................................... 5-1
5.1 Sampling of the Groundwater Waste Management Area ............................... 5-1
5.2 Groundwater Monitor Well Locations ............................................................. 5-1
5.3 Surface Water Sampling ................................................................................... 5-2
6.0 CONCLUSIONS ............................................................................................................. 6-1
7.0 REFERENCES .................................................................................................................. 7-1
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TABLE OF CONTENTS (Continued)
FIGURES
Location of Groundwater Monitoring Points
Statistical Plot for Beryllium
Statistical Plot for Cobalt
Statistical Plot for Mercury
Statistical Plot for Nickel
Location of Permit Groundwater Monitoring Points
Location of CAO Groundwater Monitoring Points
TABLES
1991 Corrective Action Order - Groundwater Monitoring Parameters
1 997 Post Closure Permit - Proposed Groundwater Monitoring Parameters
Statistical Values For Metals
GWMA Permit Monitor Wells - Completion Summary
RWMA and LWMA Permit Monitor Wells - Completion Summary
Figure 2-1
Figure 4-1
Figure 4-2
Figure 4-3
Figure 4-4
Figure 5-1
Figure 5-2
Table 2-1
Table 3-1
Table 4-1
Table 5-1
Table 5-2
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Groundwater Analyte List
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CHEVRON PRODUCTS COMPANY
Salt Lake Refinery
Data Summary for the New Groundwater Analyte List
1.0 INTRODUCTION
Chevron Products Company is nearing an agreement with the State of Utah to
finalize a Post Closure Permit for their Salt Lake Refinery in Salt Lake City, Utah. The Post
Closure Permit ("Permit") consists of seven modules. The first six modules deal with post
closure care and monitoring of the RCRA, Reservoir Waste Management Area ("RWMA")
closure cell. The RWMA, completed in 1994, contains 120,000 cubic yards of stabilized,
Utah listed KO51 hazardous waste. Groundwater monitoring at the RWMA was performed
quarterly in 1995 and semi-annually in 1996 in compliance with Corrective Action Order
9101001 1 ("CAO"), the current regulatory document for the facility, which was signed in
1991. Once in effect, the Permit will supersede the CAO, and Module V of the Permit will
direct Groundwater Monitoring of the RWMA.
To date, groundwater sampling at the RWMA has been for the parameters
presented on Table 3 in the CAO. The original purpose of this table was to provide the
parameters to be analyzed during semi-annual sampling of fifteen monitor wells throughout
the refinery designated in the CAO. Although the RWMA wells have only been monitored
for two full years (six sampling events) since closure was completed, the facility or
"Consent Order" wells have been monitored semi-annually since 1984.
Table V-1 in Module V of the Permit provides the analyte list and concentration
limits which will take effect when the Permit is signed. The original draft version of the
Permit contained the same analyte list as Table 3 of the CAO. Based on twelve years of
semi-annual sampling at the facility, it is Chevron's position that adequate data are
available to modify Table V-1 so that only those parameters which warrant continued
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sampling remain. Further, Table V-1 shall apply to both monitoring of the RWMA and
continued sampling of facility-wide groundwater.
This report summarizes the results of the groundwater quality database evaluation
and presents justification for Chevron's revisions to Table V-1. The new Table V-1 is
submitted herein as a revision to the original draft of the Permit.
In addition to this introduction, the groundwater sampling history at the refinery is
discussed in Section 2. The methodologies used to evaluate the groundwater data are
presented in Section 3. Statistical results for dissolved metals are presented in Section 4.
Section 5 describes the new monitor wells proposed for future facility wide monitoring.
Conclusions are presented in Section 6 with references in Section 7.
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2.0 SAMPLING HISTORY
Chevron has sampled facility wells semi-annually since the first Compliance Order in
1984. Although there were minor changes in some of the parameters and/or laboratory
methods between Appendix B, Part IX in the 1984 Compliance Order, and Table 3 of the
1991 CAO, most of the analytes on Table 3 of the CAO have been sampled continuously
since 1984. As a basis for discussion in this report, Table 3 from the CAO is reproduced
herein as Table 2-1 .
Upon completion of closure at the RWMA, the same sampling and analytical
methods were applied to RWMA monitor wells. In addition, wells constructed at the
Landfarm, Tetraethyl Lead Weathering Area ("TEL"), North Tank Farm and West Field
Plume were sampled using the same methods and protocols.
2.1 DATASTORAGE
All groundwater data for the Consent Order wells, and all other wells at the facility
(Non-compliance wells, RWMA, TEL, Landfarm etc.), are presently stored on the
Microsoft™ relational database program Access For Windows 95™, Version 7.0. This
database was the source for all data summarized in this report.
2.2 FACILITY GROUNDWATER MONITORING LOCATIONS
The map of the Chevron Salt Lake Refinery provided as Figure 2-1 shows the
locations of all currently functional monitor wells installed at the facility. Several well
identification prefixes are used on the map. These prefixes are identified below:
• S-2 Indicates a shallow well, less than 50 feet in depth. The S prefix was
used on all wells installed into the shallow aquifer pursuant to the
1984 Compliance Order.
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Indicates a deep well, greater than 50 feet in depth. The D prefix
was used on all wells installed into the deep aquifer pursuant to the
1984 Compliance Order.
Wells installed into the shallow aquifer as part of either the North
Tank Farm Hydrogeologic Investigation or the field investigation
program for development of the 1992 Steady State Groundwater
Flow Model.
Wells installed into the shallow aquifer as part of the monitoring
program for the Landfarm.
Wells installed into the shallow aquifer as part of the Post Closure
monitoring program for the Reservoir Waste Management Area.
Wells installed into the shallow aquifer as part of the monitoring
program for the Tetraethyl Lead Weathering Area.
Wells installed into the shallow aquifer as part of the delineation
and monitoring program for the West Field Plume identified in the
RCRA Facility Investigation ("RFI").
The "A" designates this as a replacement well for the original well,
WFP-9 in this example. The original well was damaged or relocated
to accommodate facility operations or remediation.
These are observation wells installed during the field investigation for
the 1992 Steady State Flow Model. In this example, the primary well
is D-5 and this is an Observation well which penetrates the Deep
aquifer. This well is the second (ABC) in a series at this location.
These are observation wells installed during the field investigation for
the 1992 Steady State Flow Model. In this example, the primary well
is EF-5 and this is an Observation well which penetrates the Shallow
aquifer. This well is the third (ABC) in a series at this location.
Monitor well installed by others on Chevron property to monitor a
remediation system operating at the Chevron Pipe Line Co. Salt Lake
Station.
• D-2
• EF-2
• LFM-2
• RWMA-2
• TEL-2
• WFP-2
• WFP-9A
• D-5ODB
• EF-5OSC
• CH-1
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2.3 GROUNDWATER MONITORING PROGRAMS
Several monitoring programs are, or have been, in place for different units at the
refinery. The specific purpose and the wells monitored are described below:
• Semi-Annual Sampling: This is the sampling program specified in the CAO for
facility groundwater monitoring. The wells sampled are: S-1, D-1, S-2*, D-2*,
S-4A, D-4, S-5, D-5A, S-1O*, D-10*, S-1 1 *, D-1 1 *, S-24, S-35 and D-35.
These wells have been sampled since 1984.
• These wells have been abandoned to accommodate construction of the LWMA.
• RWMA: This is the RCRA Closure cell identified above. The wells sampled are
RWMA-1 through 6, S-1 4 and S-1 8. These wells were sampled quarterly in
1995, the first year after closure, and semi-annually in 1996. Note that wells
S-1 4 and S-1 8 are not included for the RWMA in the Permit. Two years of data
suggest that because of their distance from the cell they are too far upgradient
to accurately reflect conditions of the closure cell as specified in RCRA
guidance. Rather, RWMA-1 and RWMA-5 are the upgradient wells specified in
Permit because they are immediately upgradient of the closed areas.
• TEL: The TEL is listed in the CAO as a Federal RCRA unit. The TEL was
monitored quarterly in 1995 and semi-annually in 1996. In 1996, the TEL was
closed by removal, a report was filed with the UDSHW who accepted Closure
by Removal. Thus, the TEL is no longer monitored under the CAO.
• Landfarm: The Landfarm and Landfarm Storage Area are identified as Solid
Waste Management Units in the CAO. Groundwater was sampled quarterly in
1995 and semi-annually in 1996. With facility wide monitoring proposed in the
Permit, the LFM wells will no longer be monitored when the Permit takes effect.
• West Field Plume: In the course of completing the RFI, a benzene plume was
identified in the field west of the Oil Drain Canal. Wells WFP-1 through 9A were
installed to monitor this plume. As part of the contaminant transport model
developed for the facility in 1996, and to best define the western monitoring
boundary of the Groundwater Waste Management Area ("GWMA") identified in
the Permit, wells WFP-10 through 15 were installed. Some of these wells are
listed in the Permit as part of the facility wide monitoring program.
All sampling reports, field records, original analytical certificates and laboratory QA
documentation are on file at either the Chevron refinery, EarthFax Engineering, Chemtech
Analytical Laboratory, or Mountain States Analytical Laboratory in Salt Lake City.
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3.0 DATA EVALUATION METHODOLOGIES
3.1 DATABASE INQUIRIES AND PROCEDURES
All records were queried in Access™ and compiled for each parameter listed in
Table V-1. Once compiled, those records requiring further evaluation were exported from
Access™ into the Microsoft™ spreadsheet program Excel™. Once in the spreadsheet, the
data could be processed using various statistical procedures and plotted in a graphical
presentation format.
3.2 ORGANIC COMPOUNDS AND METALS EVALUATION CRITERIA
The organic compounds and dissolved metals groundwater monitoring parameters
listed in Table 2-1 were evaluated to determine whether each constituent required
continued analysis and reporting. Four criterion were developed to make this
determination. These criterion are based on:
• compiled data,
• engineering judgment,
• familiarity with the facility history,
• regulatory drivers, and,
• statistical evaluation of available data.
A chemical can meet any one or all of criterion 1 , 2 or 3. Those which fail the first
three meet criterion 4. The four criterion are:
1. Has the particular parameter ever been detected at the Chevron Salt Lake
Refinery in compliance wells since monitoring began in 1984?
2. Has the particular parameter been detected in the last three consecutive years?
If so, has the detected value exceeded the concentration limits specified in
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Table V-1 of the Permit, described in Module VI of the Post Closure Permit, as
finalized by the UDSHW?
VI .C. DURATION OF CORRECTIVE ACTION PROGRAM
The Permittee shall continue corrective action during the compliance period to the extent
necessary to ensure that the groundwater protection standard is not exceeded. If the
Permittee is conducting corrective action at the end of the compliance period, he shall continue
corrective action for as long as necessary to achieve compliance with the groundwater
protection standard. The Permittee may terminate the CAP if he can demonstrate, based on
data from the groundwater monitoring program under Condition V, that the groundwater
protection standard has not been exceeded for a period of three consecutive years. [R315-8-
6. 1 1(f)]. Emphasis Added.
3. If the parameter has been detected above the Permit concentration limit, have
statistical comparisons demonstrated that the detections are significant?
4. Have individual parameters been detected at levels significantly above the
Permit concentration limit such that continued monitoring of that parameter is
considered critical to maintaining facility groundwater protection standards? In
addition, is that particular parameter a valid indicator of petroleum related
contaminants?
3.2.1 Parameters Meeting Criterion Number One
The analytical parameters on Table 2-1 were first queried for any recorded
detections. The following analytes were found never to have been detected since
monitoring began in 1984, thus meeting criterion one above.
Volatile Organic Compounds Base/Neutral Organic Compounds
Chlorobenzene
1 ,2 dibromoethane
1 ,2 Dichloroethane
1 ,4 Dioxane
Styrene
Ethylbenzene
Chloroform
Benzo (b) fluoranthene
Benzo (k) fluoranthene
Butyl benzyl phthalate
Chrysene
Dibenz (a,h) acridine
Benzo (a) pyrene
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Base/Neutral Organic Compounds Acid Organic Compounds
(Continued)
Dibenz (a,h) anthracene 4-Nitrophenol
Di n butyl phthalate
Dichlorobenzenes
Diethyl phthalate
Fluoranthene
Naphthalene
Pyridine
Pyrene
Since these parameters have never been detected, they clearly fall within the
criterion specified in Module VI, Section C of the Permit that allows cessation of
monitoring. As such, they warrant no further sampling or analysis.
3.2.2 Parameters Meeting Criterion Number Two
The second effort was to evaluate those parameters not eliminated under criterion
number 1, but still subject to removal from the Permit analyte list. Certain parameters may
have been detected earlier in the sampling history of the facility, but due to remedial
efforts or natural degradation, have had no detections in the past three years (six semi-
annual sampling events). These parameters are listed below:
Base/Neutral Organic Compounds Acid Organic Compounds
Benz (a) anthracene 2,4-Dinitrophenol
Bis-(2-ethyl) phthalate
Di-n-octyl phthalate
Indene
Methyl chrysene
In addition to this list, there are numerous parameters which have only been
detected in monitor well S-2. This well was located at the Oily Dump. The Oily Dump
was identified in the CAO as a Solid Waste Management Unit ("SWMU") and was
investigated during the RFI. Based on the RFI results, both a Corrective Measures Study
and a Corrective Action Plan were developed for the Oily Dump. Ultimately, the Oily Dump
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was classified as part of the Landfill Waste Management Area ("LWMA") remediation
project currently being constructed. The LWMA includes not only the Oily Dump SWMU
but the adjacent Solid Waste Landfill SWMU and several remote SWMUs.
The Oily Dump is identified in the RFI as the source for the West Field Plume
discussed in Section 2.3 of this report. Because this source has been identified by
Chevron, and remediation of the LWMA will eliminate that source, it will no longer be a
long term contributor to groundwater chemistry. The following list identifies the
parameters on Table 3 of the CAO which have only been detected at monitor well S-2 at
the Oily Dump. It should be noted that because monitor well S-2 falls within the footprint
of the LWMA, it was abandoned in 1995.
Metals Volatile Organic Compounds Base/Neutral Organic Compounds
Beryllium Carbon Disulfide 1 1 -Methylnaphthalene
Cadmium Methyl Ethyl Ketone Phenanthrene
Cobalt Toluene Quinoline
Selenium
Nickel
Acid Organic Compounds
Cresols
2,4-Dimethylphenol
Phenol
1 Carbon Disulfide was detected in other wells during the Fall 1996 Semi-Annual Sampling. However, this
detection is coincident with the first ever use of carbon disulfide as a laboratory extraction solvent. Thus, the only
validated detections of carbon disulfide have occurred in monitor well S-2.
As stated, the primary purpose of the LWMA remediation project is to remove the
source of these and other previously detected groundwater analytes. Upon completion of
the LWMA, Chevron will install upgradient and downgradient monitor wells around the
LWMA. In accordance with Module VI Section C, Chevron plans to sample the above
listed parameters for three years at the LWMA in addition to those on the final version of
Table V-1. If the conditions of VI. C are satisfied after that time period, the additional
analytes will be dropped from future sampling events at the LWMA.
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3.2.3 Parameters Meeting Criterion Number Three
Some parameters were routinely detected, but mostly at levels at or near the
concentration limits specified in the Permit. Additional analysis was needed to confirm
whether those parameters should remain on the Permit analyte list.
Based on the above criterion, dissolved metals were the only parameters routinely
detected where statistical evaluation was necessary. The only metals which were
evaluated further are:
Metals
Barium Mercury
Beryllium Nickel
Cobalt
The balance of Table 3 metals will remain on the analyte list in the Permit even
though some qualified for removal. The metals that remain on the list have historically
been used as Indicator Parameters for the facility.
3.2.4 Parameters Meeting Criterion Number Four
If the database investigation indicated that an organic compound or dissolved metal
had significant detections at or above the concentration limit proposed in the Permit, that
organic compound or dissolved metal would remain in the Permit on Table V-1. The
parameters meeting this criterion become the revised Table V-1 list proposed by Chevron
for the Permit.
This list, with the other indicator analytes Chevron proposes for continued analysis,
is provided here as Table 3-1 and represents the final analyte list proposed by Chevron for
semi-annual groundwater sampling under the Permit. This list is also reproduced as Table
V-1 for inclusion into the Permit.
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3.3 DEEP AQUIFER
There have been no organic or dissolved metals detections above the MDL's in the
deep monitor wells since monitoring began. These wells, D-1, D-2, D-4, D-5A, D-10, D-1 1
and D-35 have been sampled every time the shallow aquifer Consent Order wells have
been sampled. The results are in the database and were found to contain no detections.
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4.0 RESULTS
4.1 METHODS
In accordance with Criterion 3, the following statistical methods were employed to
evaluate the dissolved metals listed in Section 3.2.3. The equations referenced are part of
the standard statistical functions library found in Microsoft Excel™. The Excel™ output
files are provided as Table 4-1. The graphs referenced below are shown on Figures 4-1
through 4-4.
The following sequence was followed for each metal:
• Query the database for all detections of each metal at the refinery;
• Calculate the average, minimum and maximum concentrations of record;
• Calculate the Standard Deviation (o) using the following equation:
y 77(77 - 1)
(Equation 1)
Where:
n ~ the number of samples
x = the sample value
n-1 = non-biased population
• Calculate the median;
• Calculate the 95% Upper Confidence Level ("UCL") using the following
equation:
n (Equation 2)
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Where:
1 .96 = a constant that indicates this calculation was
performed for a 95% confidence level
x = Average value of the sample population;
cr = Standard Deviation (See Equation 1);
n - Number of sample values.
• Tabulate the concentration limit for each parameter from Table V-1 in the
Permit.
• Transfer the results to a graphical format for presentation and discuss.
It should be noted that all samples were used in the determination. For those
samples which were not detected above the Method Detection Limit ("MDL"), the MDL
itself was used. For example, if cobalt was reported as <0.005 mg/l, 0.005 was used in
the above equations as the level for cobalt. Thus, the overall values resulting from this
comparison are biased high because actually, in the example, cobalt could be 0 or any
other value less than 0.005.
4.2 RESULTS
All values for the last three years, (six semi-annual sampling events), are tabulated
on Table 4-1 for the metals listed in Section 3.2.3. In addition, these same values are
plotted against time beginning with the first sampling event in 1991. For each of the
metals, the following numerical values were determined for use in the equations listed in
Section 4.1 . These values are listed at the bottom of Table 4-1 .
Average of all values, using the detection limit as the value for non detect,
(Provided for reference on Figure 4-1 through 4-4)
Minimum value detected, usually the MDL where sample was below the
MDL,
Maximum value detected,
The Standard Deviation using Equation No. 1 above,
The Median,
The 95% Upper Confidence Level using Equation No. 2 above,
The UDSHW proposed concentration limit from Table V-1 in the Permit.
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4.2.1 Metals Requiring No Detailed Evaluation
Some metals were only detected on one or two sampling events and only in well S-
2. As referenced in Section 3.2.2, the parameters detected in S-2 will be monitored for
three years at the LWMA post remediation monitor wells. The metals which meet criteria
2 and 3, and their frequency of detection are:
• Antimony, Detected in S-2 and S-1. These two detections (2.4%) are
insignificant considering the 85 total samples collected. After eliminating the
detection at S-2, using the above referenced sampling plan, the single detection
in S-1, which occurred in April of 1994, can be considered within the allowable
range of sampling or laboratory error (1 .2%), or as an anomalous reading. Thus,
Antimony will be not be on the revised Table V-1 in the Permit.
• Barium, As referenced on Table V-1 of the Permit, the MDL proposed in the
Permit is 1 mg/L Although barium has been detected frequently in every well,
there are no detections on record which approach the 1 mg/l MDL in Permit.
Therefore, because all detections of barium are below the proposed MDL, there
is no justification to continue analyzing for barium. It should be noted that
barium is typically detected throughout the Jordan River Valley at background
concentrations higher than other areas of the State (Hely, 1971).
• Selenium, Selenium has only one detection in the last three years. This
detection was in April of 1995 at well S-2. Because the only detection was in
S-2 the plan for the LWMA post remediation sampling discussed above includes
selenium, but it has been eliminated from Table V-1 in the Permit.
• Vanadium, There have only been three detections of vanadium. All three
occurred at well S-2. Because the only detection was in S-2 the plan for the
LWMA post remediation sampling discussed above includes vanadium, but it has
been eliminated from Table V-1 in the Permit.
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4.2.2 Beryllium
The average concentration for beryllium is 0.013 mg/l and the calculated UCL is
0.0158 mg/l. These values are both greater than the MDL proposed in the Permit. The
results of the comparison for beryllium are presented on Figure 4-1 .
Of the 85 total samples for beryllium since 1991 , only 1 1 , or 12.9% exceed the
UCL. Nine of these exceedances are in well S-2. Of those, 4 of the samples at S-2 were
below the MDL for the respective sampling event. The remaining two detections above
the UCL were in wells S-1 and S-5. Both detections were below the MDL for the
respective sampling event.
Based on these results, there were no exceedances except in well S-2. The
sampling plan detailed above will include beryllium at the LWMA for at least 3 years.
However, the numerical values from this comparison qualify beryllium under criterion No.
2. Therefore, beryllium can be dropped from Table V-1 in the Permit.
4.2.3 Cobalt
The average concentration of cobalt is 0.088 mg/l and the UCL is 0.14 mg/l. Both
of these values exceed the MDL proposed in the Permit. The results for cobalt are
presented on Figure 4-2.
Of the 86 total samples, only 10, (11.8%), exceed the UCL. All of these
exceedances are in well S-2. In addition, most of the remaining detections are not only
below the UCL but also below the MDL proposed in the Permit. Therefore, cobalt will
remain on the list for sampling at the LWMA post remediation wells, but will be dropped
from Table V-1 for facility monitoring because it meets criterion No. 2 above.
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4.2.4 Mercury
The average concentration of mercury is 0.00046 mg/l and the UCL is 0.0006 mg/l.
The Permit MDL is 0.002 mg/l which is significantly greater that the average and UCL
calculated for the samples collected at the facility.
Only 4 of the 85 values (4.7%) exceed the UCL, however, they are below the
Permit MDL and can therefore, be removed from Table V-1. There are 6 values which
exceed the MDL. One is in well S-1, one is in well S-5, but is below the MDL for that
particular sampling event and 4 are in well S-2. Three of the detections in well S-2 were
below the MDL for the individual sampling events. The graph for mercury is presented in
Figure 4-3.
Based on the detections in well S-2, mercury will be analyzed in the LWMA post
remediation wells as discussed above. This leaves the only actual detection of mercury in
well S-1 . This detection represents 1 .2% of the total population, and thus either falls
within the allowable range for sampling or laboratory error, or can be considered an
anomalous value. Therefore, with the exception of the LWMA, mercury will be dropped
from Table V-1 in the Permit because it meets criterion No. 2 above.
4.2.5 Nickel
The average nickel concentration is 0.171 mg/l and the UCL is 0.263 mg/l. There
are 10 values (11.8%) which exceed the UCL. All 10 are in well S-2. As referenced in
Section 3.3.2, nickel will remain on the analyte list for the post remediation LWMA wells
but because it meets criterion number 2, will be dropped from Table V-1 in the Permit
because there are no significant detections.
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5.0 MONITORING PLAN
5.1 SAMPLING OF THE GROUNDWATER WASTE MANAGEMENT AREA
Chevron proposes monitoring of the Groundwater Waste Management Area
("GWMA") as Final Remedy Corrective Action for facility wide groundwater. Doing so
meets the stipulations stated in Module VII, Sections G.1-G.7 of the Permit. If, at any
time during the monitoring period, unusual detections of Table V-1 analytes occur, an
investigation into the cause and/or source of the detection will be made. Future sampling
plans for the GWMA, or at least the area affected, will be modified based on results of the
investigation.
If, after sampling under the Permit begins, 3 years, (six semi-annual sampling
events), pass and there are no detections or substantial changes in background
concentrations, Chevron may elect to modify the frequency of groundwater monitoring.
Accordingly, for the GWMA and RWMA, the last 3 years of record discussed and
validated in sections 3 and 4 of this report, shall become the basis (background
concentration), to which all future samples will be compared.
5.2 GROUNDWATER MONITOR WELL LOCATIONS
As directed in the CAO, the fifteen monitor wells listed in the first bullet of Section
2.3 have been sampled semi-annually since 1984. As discussed above, facility wide
compliance monitoring of groundwater will become Final Remedy Corrective Action for the
GWMA. Under this new plan, the existing CAO wells no longer define the ideal monitor
points. Consequently, new wells have been designated which better represent facility
wide groundwater conditions and accommodate regional flow direction and known sources
of contamination.
The Groundwater Flow Models and the Solute Transport Model (EarthFax, 1992 and
1996) were used to locate the new Permit monitor wells. Completion details for these
EarthFax Engineering, Inc.5-1
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
wells are provided on Table 4-1 of Attachment 5 of the Permit, "Water Data Collection
Quality Assurance Plan for the Salt Lake Refinery". The location of these wells is
presented in this report as Figure 5-1 . The original fifteen wells monitored under the CAO
are identified on the Figure 5-2. The new Permit wells from Table 4-1 of Attachment 5 are
presented in this report as Table 5-1. Similarly, completion details for the RWMA and
identification of the four proposed LWMA wells from Table 4-2 of Attachment 5, are
provided here as Table 5-2.
Effective with approval of the Permit, the new wells will be sampled semi-annually
for the analytes on the revised Table V-1 in the Permit (Table 3-1 in this report). All
sampling will be conducted pursuant to the Permit and Attachment 5 which details the
sampling procedures, protocols and QA procedures.
Until the Permit becomes effective, Chevron will continue to sample groundwater at
the fifteen monitor wells designated in the CAO. These wells will continue to be sampled
for the analytes in Table 3 of the CAO (Table 2-1 in this report) as they have since the
1984 Compliance Order.
5.3 SURFACE WATER SAMPLING
There is no mention of continued surface water sampling in the Permit. However,
three surface water sampling stations (WW-1, WW-2 and WW-3) along the Oil Drain Canal
have been sampled regularly since issuance of the 1984 Compliance Order. As with
groundwater, the twelve plus years of analytical data suggest that continued monitoring is
not necessary.
Based on the surface water analytical record, Chevron is in agreement with the
UDSHW. Accordingly, sampling of the Oil Drain Canal will not be included in the Permit
and thus, will no longer be performed coincident to semi-annual sampling once the Permit
is issued.
EarthFax Engineering, Inc.5-2
Groundwater Analyte List
Data Summary
Chevron Products Company
Salt Lake Refinery
April 2, 1997
6.0 CONCLUSIONS
Based on the database inquiries and the analysis performed for this report, the
following conclusions can be made regarding Chevron's future groundwater monitoring
program. It is Chevron's intent that the changes referenced will take place when the Post
Closure Permit is signed, superseding the CAO.
• The CAO, including Table 3, will no longer be applicable to groundwater
sampling;
• Table V-1 of the Permit, as modified herein, will become the new analyte list;
• The deep aquifer will no longer be sampled;
• The monitor wells listed in the CAO will be changed in the Permit to those
presented herein on Figure 5-1;
• The Landfarm will no longer be sampled separately;
• The West Field Plume will no longer be sampled separately;
• The Bonneville Canal I North Tank Farm will no longer be sampled separately;
• Surface water samples will no longer be collected along the Oil Drain Canal.
The following tables show the revised analytical parameters and new well data,
respectively. These tables will be incorporated into the final version of the Permit when it
is presented to Chevron for final review unless the UDSHW makes the revisions prior to
submittal to Chevron.
• Table V-1 ; will be inserted into the final copy of the Post Closure Permit. This
revised version of the table shows the final analyte list as justified in this report.
• Tables 4-1 and 4-2; in Attachment 5 to the Permit, have been revised to show
the monitor well completion details for the GWMA, RWMA and LWMA.
EarthFax Engineering, inc.6-1
Groundwater Analyte List
Data Summary
Chevron Products Company
Salt Lake Refinery
April 2, 1997
7.0 REFERENCES
(Not All Below Are Cited, Some Are Only Referenced)
EarthFax Engineering, Inc. 1991. RCRA Facility Investigation Work Plan For The Chevron
Salt Lake Refinery. Prepared for Chevron Products Company, Salt Lake Refinery.
EarthFax Engineering, Inc. 1991 . Quality Assurance Plan For The Collection Of Water
Data. Prepared for Chevron Products Company, Salt Lake Refinery.
EarthFax Engineering, Inc. 1992. Steady State Groundwater Flow Model for the Chevron
U.S.A., Salt Lake Refinery.
EarthFax Engineering, Inc. 1996. Steady State Groundwater Flow Model and Contaminant
Transport Model for the Chevron Salt Lake Refinery.
EarthFax Engineering, Inc. 1994. RCRA Facility Investigation Report For The Chevron Salt
Lake Refinery. Prepared for Chevron Products Company, Salt Lake Refinery.
EarthFax Engineering, Inc. 1994. RCRA Facility Investigation Report For The Chevron Salt
Lake Refinery. Prepared for Chevron Products Company, Salt Lake Refinery
Hely, A. G. 1971. Water Resources of Salt Lake County. Technical Publication No. 31.
State Of Utah, Department of Natural Resources.
State of Utah Solid and Hazardous Waste Committee. 1984. Chevron U.S.A. Inc. Salt
Lake City Refinery, Salt Lake City, Utah. Compliance Order On Consent No.
8403083
State of Utah Solid and Hazardous Waste Committee. 1991. Chevron U.S.A. Inc. Salt
Lake City Refinery, Salt Lake City, Utah. Corrective Action Order 91010011
Utah Division of Solid and Hazardous Waste, 1996. Chevron Salt Lake Refinery Post
Closure Permit. With Attachments.
EarthFax Engineering, Inc.7-1
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
FIGURES
EarthFax Engineering, inc.
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Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
TABLES
EarthFax Engineering, inc.
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
Table 2-1
1991 Corrective Action Order
GROUNDWATER MONITORING PARAMETERS
General Volatile Organics (Cont.)
Calcium Styrene
Magnesium Ethyl benzene
Potassium Toluene
Sodium Xylenes1
Sulfate
Chloride
Alkalinity
Base/Neutral Organics
Nitrate 4- Nitrite as N Anthracene
Fluoride Benz (a) anthracene
Sulfide Benzo (b) fluoranthene
pH Benzo (k) fluoranthene
Specific Conductance Benzo (a) pyrene
Total Dissolved Solids Bis (2-ethylhexyl) phthalate
Oil and Grease Butyl benzyl phthalate
Chrysene
Metals Dibenz (a,h) acridine
Dibenz (a,h) anthracene
Antimony Di-n-butyl phthalate
Arsenic Dichlorobenzenes1
Barium Diethyl phthalate
Beryllium Di-n-octyl phthalate
Cadmium Fluoranthene
Chromium Indene
Cobalt Methyl chrysene
Lead 1 -Methylnaphthalene
Mercury Naphthalene
Nickel Phenanthrene
Selenium Pyrene
Vanadium Pyridine
Quinoline
Volatile Organics
Acid Organics
Benzene
Carbon disulfide Benzenethiol
Chlorobenzene Cresols 1
Chloroform 2,4-dimethylphenol
1 ,2-Dibromoethane 2,4-Dinitrophenol
1 ,2-Dichloroethane 4-Nitrophenol
1 ,4-Dioxane
Methyt ethyl ketone
Phenol
1) Reported as ortho-, meta-, and para- isomers
EarthFax Engineering, inc.
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
Table 3-1
1997 Post Closure Permit
PROPOSED GROUNDWATER MONITORING PARAMETERS
General Metals
Calcium Arsenic
Magnesium Cadmium*
Potassium Chromium
Sodium
Sulfate
Lead
Chloride
Alkalinity
Volatile Organics
Nitrate + Nitrite as N Benzene
Fluoride Ethylbenzene*
Sulfide Toluene*
pH
Specific Conductance
Xylenes1
Total Dissolved Solids
Oil and Grease
Base/Neutral Organics
Naphthalene*
Acid Organics
Benzenethiol
* Voluntarily left on list by Chevron as an indicator parameter.
1) Reported as ortho-, meta-, and para- isomers
EarthFax Engineering, Inc.
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
TABLE 4-1
CHEVRON PRODUCTS COMPANY
Salt Lake Refinery
Statistical Values for Metals
In Monitor Wells S-1, S-2, S-5, S-10, S-1 1 , S-24 AND S-35
“ SAMPLE ID SAMPLE DATE BARIUM BERYLLIUM COBALT MERCURY NICKEL
S-1 04/17/91 0.159 0.01 0.01 0.0002 0.063
S-1 10/15/91 0.068 0.01 0.01 0.0002 0.01
S-1 04/13/92 0.072 0.01 0.01 0.0002 0.126
S-1 10/15/92 0.101 0.02 0.01 0.0002 0.066
S-1 04/13/93 0.047 0.02 0.01 0.0002 0.035
S-1 10/20/93 0.059 0.01 0.01 0.0002 0.039
S-1 04/1 9/94 0.056 0.01 0.01 0.0002 0.01
S-1 10/14/94 0.077 0.01 0.01 0.0002 0.083
S-1 04/20/95 0.069 0.01 0.01 0.0002 0.01
S-1 10/24/95 0.07 0.001 0.01 0.0002 0.05
S-1 04/19/96 0.11 0.005 0.05 0.0002 0.14
S-1 10/17/96 0.04 0.002 0.02 0.0021 0.1
S-2 04/17/91 0.018 0.031 0.59 0.0002 1.62
S-2 10/17/91 0.01 0.043 0.56 0.00025 1.14
S-2 04/15/92 0.032 0.01 0.205 0.002 0.602
S-2 10/14/92 0.05 0.05 0.34 0.001 0.658
S-2 04/15/93 0.015 0.075 1.09 0.003 1.91
S-2 10/21/93 0.05 0.05 0.303 0.003 0.429
S-2 04/22/94 0.041 0.035 0.886 0.0002 1.73
S-2 10/13/94 0.026 0.02 0.536 0.003 0.765
S-2 04/28/95 0.024 0.057 1.21 0.0002 1.86
S-2 11/01/95 0.02 0.019 0.42 0.001 1.01
S-4 04/16/91 0.067 0.01 0.01 0.0002 0.01
S-5 04/18/91 0.114 0.01 0.01 0.0002 0.058
S-5 10/16/91 0.111 0.01 0.01 0.0002 0.016
S-5 04/14/92 0.058 0.01 0.01 0.0002 0.028
S-5 10/13/92 0.087 0.01 0.01 0.0002 0.012
S-5 04/14/93 0.155 0.02 0.01 0.0002 0.01
S-5 10/19/93 0.096 0.01 0.01 0.0002 0.01
S-5 04/26/94 0.151 0.01 0.01 0.0002 0.01
S-5 10/13/94 0.079 0.01 0.01 0.002 0.01
S-5 04/27/95 0.11 0.01 0.01 0.0002 0.01
S-5 10/31/95 0.15 0.01 0.1 0.0002 0.1
S-5 04/17/96 0.14 0.001 0.01 0.0002 0.02
S-5 10/15/96 0.06 0.002 0.02 0.0005 0.1
S-10 04/18/91 0.194 0.01 0.01 0.0002 0.01
S-10 10/15/91 0.184 0.01 0.01 0.0002 0.017
S-10 04/14/92 0.149 0.01 0.01 0.0002 0.018
S-10 10/13/92 0.169 0.01 0.01 0.0002 0.017
S-10 04/13/93 0.151 0.02 0.01 0.0002 0.014
EarthFax Engineering, Inc.
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
TABLE 4-1 (Continued)
CHEVRON PRODUCTS COMPANY
Salt Lake Refinery
Statistical Values for Metals
In Monitor Wells S-1, S-2, S-5, S-10, S-11, S-24 AND S-35
SAMPLE ID SAMPLE DATE BARIUM BERYLLIUM COBALT MERCURY NICKEL
S-10 10/20/93 0.167 0.01 0.01 0.0002 0.017
S-10 04/21/94 0.144 0.01 0.01 0.0002 0.01
S-10 10/12/94 0.171 0.01 0.01 0.001 0.012
S-10 04/21/95 0.174 0.01 0.01 0.0002 0.013
S-10 10/25/95 0.19 0.001 0.01 0.0002 0.03
S-10 10/20/93 0.167 0.01 0.01 0.0002 0.017
S-10 04/21/94 0.144 0.01 0.01 0.0002 0.01
S-10 10/12/94 0.171 0.01 0.01 0.001 0.012
S-10 04/21/95 0.174 0.01 0.01 0.0002 0.013
S-10 10/25/95 0.19 0.001 0.01 0.0002 0.03
S-11 10/15/91 0.268 0.01 0.01 0.0002 0.014
S-11 04/13/92 0.192 0.01 0.01 0.0002 0.01
S-11 10/13/92 0.136 0.01 0.01 0.0002 0.01
S-11 04/13/93 0.229 0.02 0.01 0.0002 0.01
S-11 10/20/93 0.296 0.01 0.01 0.0002 0.01
S-11 04/25/94 0.262 0.01 0.01 0.0002 0.01
S-11 10/13/94 0.3 0.01 0.01 0.003 0.021
s-11 04/26/95 0.257 0.01 0.01 0.0002 0.014
S-11 10/27/95 0.55 0.001 0.01 0.0003 0.02
S-11 04/16/96 0.17 0.001 0.01 0.0005 0.01
S-1 1 10/17/96 0.41 0.002 0.02 0.0005 0.1
S-24 04/17/91 0.111 0.01 0.01 0.0002 0.013
S-24 10/15/91 0.118 0.01 0.01 0.0002 0.01
S-24 04/13/92 0.106 0.01 0.01 0.0002 0.01
S-24 10/14/92 0.126 0.01 0.01 0.0002 0.015
S-24 04/14/93 0.119 0.02 0.01 0.0002 0.01
S-24 10/20/93 0.09 0.01 0.01 0.0002 0.01 1
S-24 04/21/94 0.099 0.01 0.01 0.0002 0.01
S-24 10/12/94 0.104 0.01 0.01 0.0002 0.013
S-24 04/25/95 0.126 0.01 0.01 0.0002 0.042
S-24 10/27/95 0.2 0.01 0.1 0.0003 0.1
S-24 04/25/96 0.1 0.001 0.01 0.0002 0.02
S-24 10/17/96 0.07 0.002 0.02 0.0005 0.1
S-35 04/16/91 0.062 0.01 0.01 0.0002 0.01
S-35 10/15/91 0.055 0.01 0.01 0.0002 0.01
S-35 04/13/92 0.042 0.01 0.01 0.0002 0.01
S-35 10/14/92 0.05 0.01 0.01 0.0002 0.01
S-35 04/14/93 0.049 0.02 0.01 0.0002 0.01
EarthFax Engineering, Inc.
Groundwater Analyte List
Data Summary
Chevron Products Company
Salt Lake Refinery
April 2, 1997
TABLE 4-1 (Continued)
CHEVRON PRODUCTS COMPANY
Salt Lake Refinery
Statistical Values for Metals
In Monitor Wells S-1, S-2, S-5, S-10, S-11, S-24 AND S-35
SAMPLE ID SAMPLE DATE BARIUM BERYLLIUM COBALT MERCURY NICKEL
S-35 10/19/93 0.047 0.01 0.01 0.0002 0,01
S-35 04/19/94 0.057 0.01 0.01 0.0002 0.01
S-35 10/12/94 0.057 0.01 0.01 0.0002 0.01
S-35 04/20/95 0.065 0.01 0.01 0.0002 0.01
S-35 10/24/95 0.06 0.001 0.01 0.0002 0.01
S-35 04/16/96 0.06 0.001 0.01 0.0002 0.01
S-35 10/15/96 0.05 0.002 0.02 0.0005 0.1
Average 0.1195 0.0130 0.0879 0.0005 0.1705
Min 0.0100 0.0010 0.0100 0.0002 0.0100
Max 0.5500 0.0750 1.2100 0.0030 1.9100
Std. Dev.0.0917 0.0127 0.2296 0.0007 0.4242
Median 0.1000 0.0100 0.0100 0.0002 0.0140
UCL 0.1395 0.0158 0.1400 0.0006 0.0263
Limit 1 .0000 0.0030 0.0700 0.0020 0.0500
EarthFax Engineering, Inc.
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
TABLE 5-1
GWMA PERMIT MONITOR WELLS
COMPLETION SUMMARY
Well Number
Well
Depth
(ft)
Well
Diameter
(in)
Screened
From
(ft)
Screened
To
(ft)
Slot
Aperture
(in)
S-1 15.0 2 1.0 15.0 0.010
S-4A 18.0 4 2.65 17.65 0.010
S-5 15.0 7 2.0 15.0 0.010
S-24 11.3 2 1.3 11.3 0.016
S-35 16.0 2 4.0 16.0 0.016
WFP-10 20.0 2 10.0 20.0 0.010
WFP-11 18.0 2 3.0 18.0 0.010
WFP-12 25.0 2 2.5 22.5 0.010
WFP-13 18.0 2 3.0 18.0 0.010
EarthFax Engineering, inc.
Chevron Products Company
Salt Lake Refinery
April 2, 1997
Groundwater Analyte List
Data Summary
TABLE 5-2
RWMA AND LWMA PERMIT MONITOR WELLS
COMPLETION SUMMARY
Well Number
Well
Depth
(ft)
Well
Diameter
(in)
Screened
From
(ft)
Screened
To
(ft)
Slot
Aperture
(in)
RWMA-1 25.0 2.0 9.5 25.0 0.010
RWMA-2A 25.0 2.0 9.5 25.0 0.010
RWMA-3 25.0 2.0 10.0 25.0 0.010
RWMA-4 23.5 2.0 8.5 23.5 0.010
RWMA-5 18.5 2.0 3.5 18.5 0.010
RWMA-6 18.5 2.0 3.5 18.5 0.010
LWMA-1 25.0 2.0 10.0 25.0 0.010
LWMA-2 25.0 2.0 10.0 25.0 0.010
LWMA-3 25.0 2.0 10.0 25.0 0.010
LWMA-4 25.0 2.0 10.0 25.0 0.010
NOTE: All LWMA completion details are proposed. Wellswill be installed upon completion of the
LWMA.
EarthFax Engineering, inc.