HomeMy WebLinkAboutMITIGATIONTriHydro Corporation
920 Sheridan Street (307) 745-7474
Laramie, Wyoming 82070 FAX: (307) 745-7729
March 31, 2004
Mr. Anthony Medrano
California Regional Water Quality Control Board
Central Valley Region
3614 E. Ashland Avenue
Fresno, CA 93726-3533
RE:
Workplan to Conduct Subsurface Investigation and Remediation, Storage Tank 80008, Shell
Oil Products US Bakersfield Refinery & Terminal, Bakersfield, California
Dear Mr. Medrano,
Shell Oil Products US (SOPUS) is the current owner and operator of a petroleum refinery and
terminal located at 6451 Rosedale Highway, Bakersfield, California (Figure 1). As reported to you in
March 2004, a release of an undetermined quantity of unleaded regular gasoline was discovered as
part of tests performed on Tank 80008 (Figure 2). This workplan describes the proposed installation
of three soil borings, to be completed as vapor extraction wells, and proposed vapor extraction
remediation activities in the vicinity of Tank 80008. This workplan shall follow guidelines established
in TriHydro Corporation's (TriHydro's) Master Workplan for Environmental Site Assessment, Shell
Bakersfield Refinery, dated February 26, 2004. Further assessment and remediation of the vicinity
of Tank 80008 will be performed in conjunction with work outlined in Study Section 4 - Mohawk
Tank Farm, of the Master Workplan.
Proposed Scope of Work
This workplan was prepared to describe soil assessment, well installation, and vapor extraction
system C/ES) hookup procedures in the vicinity of the Tank 80008. Because the release point
appears to be atthe bottom of the tank, and due to the presence of large piping manifolds near the
tank, it is difficult to assess the extent of the release without removal of the tank and its above
ground appurtenances. TriHydro is proposing to combine the initial soil assessment with the
installation of three vapor extraction wells adjacent to Tank 80008. The wells will be connected by
above- and below-grade PVC and steel manifold piping to the Refinery's vapor extraction system
located in Area 2. The wells will be opened to the YES in an effort to inhibit lateral and vertical
migration of petroleum hydrocarbons, and to begin remediation of' petroleum hydrocarbon-affected
soils in the vicinity of Tank 80008.
Well Locations and Installation
Figure 2 illustrates the proposed locations of the vapor extraction wells. Note that the actual
locations of the wells may be altered if obstacles, are encountered during field activities (utilities,
above ground impediments, etc.). The proposed wells are to be located along the southeast to
southwest edge of Tank 80008. Wells VES-1 and ¥ES-2 will be completed at a depth of 35 feet
H:\Projects\SHELL\Bakersfield\Final\O77-O53\WorkplanTank80008.doc
Mr. Anthony Medrano
March 31,2004
Page 2
below ground surface (bgs) and screened from 5 to 35 feet bgs. Well VES-3 will be completed at a
depth of 65 feet bgs and screened from 35 to 65 feet bgs. The wells will be located as close as
possible to the 1 '1 O-foot diameter tank to take advantage of the 50 to 70 foot vapor extraction radii of
influence typically seen at the Facility. Procedures for permitting, drilling, sampling, logging, field
screening, soil sample laboratory analysis, and surveying will be as described in the Master
Workplan. The vapor extraction wells will be drilled and installed using a limited access hollow-stem
auger drill rig.
The vapor extraction well borings will be sampled at depths of 2 feet bgs, 5 feet bgs and at 5-foot
intervals thereafter to the base of each boring. Vapor extraction wells will be constructed using 4-
inch inside diameter (I.D.) flush-threaded, Schedule 40 PVC blank and slotted casing. A threaded
end cap will be placed at the bottom of the PVC slotted casing, which will then be set through the.
auger. The screened portion of each well will utilize 30 feet of 0.02-inch machine-cut slotted casing.
Number 3 sand will be poured down the auger while removing approximately 3 feet of auger at a
time. The filter pack will be placed to a height of 1 to 2 feet above the screened interval, 2 feet of
bentonite pellets will be poured through the auger to form an annular seal, and bentonite grout will
be tremmied through the auger to a depth of 1-foot bgs.
The wells will be tied to the described vapor system by above-grade steel and below-grade PVC
piping. Since the wells will be located within the confines of a tank farm, well casings will be
extended to approximately 5 feet above ground surface (ags). In addition, a raised protective casing
will be installed to prevent entry of surface runoff waters and provide access for future sampling.
When a well is added to the extraction well network, a raised platform will be installed adjacent to
the well to accommodate required valving and sample ports.
Soil Sample Analyses
Soil samples will be collected and submitted to Calscience Environmental Laboratories (Garden
Grove, California). Selected soil samples will be analyzed for benzene, toluene, ethylbenzene, and
xylenes (BTEX) and methyl tert-butyl ether (MTBE) by EPA Method 8260, and total petroleum
hydrocarbons as gasoline (TPH-G) by Modified EPA Method 8015. As specified in the Master
Workplan, the holding time for these analyses is 14 days from the date of collection.
Project Schedule
Because of the recent nature of the release, it is advantageous to begin vapor extraction in the near
future to reduce potential impacts and overall remediation requirements. As such, SOPUS has
already initiated work associated with the implementation of this work plan (procurement of
equipment and materials, scheduling drilling activities, etc.) The drilling is expected to commence
the week of April 26, 2004. CRWQCB personnel will be kept informed as field work progresses,
and notified of possible delays in completing the field activities.
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Mr. Anthony Medrano
March 31,2004
Page 3
ReportinR
Within 60 days of the receipt of the analytical data associated with sampling during installation of the
wells, SOPUS will prepare a brief summary report for the activities for submittal to CRWQCB. The
report will include a description of field procedures, well completion information (including borehole
logs), copies of well permits, and analytical results. Subsequent vapor extraction operational data
will be reported in the quartedy groundwater monitoring report for the entire facility.
If you have any questions or need any additional information, please call me at (714) 238-3477.
Mark J Passar~CP.,E. ..:
cc: Gene Freed, SOPUS
Attachments
077-053-004
C:~Documents and Settings~mpassadni\Local Settings\Temporary Intemet Files\OLK1\WorkplanTank800081 .doc
'Oi~ Sump
; ".L.i
AREA 1
'SHELL BAKERSFIELD
REFINERY
AREA 3
0
I i
SCALE
:Jig
J~
2000 ft.
from U.$.G.S. 7.5 MIN. QUADRANGLE
GOSFORD, CA 1949. PHOTOREVISED 1969
AND OILDALE. CA 1954. PHOTOREVISED 1968
FIGURE 1
.,.. SITE VICINITY MAP, SHELL BAKERSFIELD,
TriHydro REFINERY AND SALES TERMINAL,
Corporation BAKERSFIELD, CAL.IFOi~II~
920 S herman Saeet
Laramie, Wyoming 820~0
i Drawn By: BW I Checked By: NB I Scale: AS SHOWN I Date: 03/0B/03 I Ref: 077USGSSITES
FIGURE 2
PROPOSED VAPOR EXTRACTION WELL
~ LOCATIONS,
TrtHydro SHELL BAKERSFIELD REFINERY,
Corporation BAKERSFIELD, CALIFORNIA
920 Sheridan Street
Laramie, Wyoming 82070
EXP/.,4fl,4 T/ON
VES-2 PROPOSED VAPOR
· EXTRACTION WELL
LOCATION
0 80 ft.
I I I
SCALE
e ua y 24, 200 ,..~~,
nt
Subject:
Shell Oil Products US
Shell Bakersfield Refinery
6451 Rosedale Highway
Bakersfield, CA 93308
Tel +1 661 326 4200
Shell Bakersfield Refinery - Groundwater Remediation Projects;
Transmittal of Quarterly Monitoring Reports
Dear Mr. Huey:
Please find enclosed a copy of the following reports for the groundwater monitoring and
remediation projects at the Shell Bakersfield Refinery at located at 6451 Rosedale
Highway and 3663 Gibson Street:
· 4th Quarter and Annual 2003 Groundwater Monitoring Report; and
· 4th Quarter and Annual 2003 NPDES Monitoring Report.
The groundwater monitoring reports provide groundwater elevation and groundwater
quality data for all areas of the refinery. The NPDES monitoring reports provide
additional monitoring and analytical data for two groundwater recovery and treatment
systems installed to contain and remediate dissolved hydrocarbons and MTBE in
shallow groundwater within the Shell refinery and terminal and the vicinity of Fruitvale
and Charity Avenues.
If you shoUld have any questions, please call me at 661-326-4351 or Mr. Gene Freed at
661-326-4412.
Sincerely,
· Steven D. Overman
Environmental Department
SDO/
C: Gene Freed