HomeMy WebLinkAboutWork Plans for Site Assessment. - 1997 and 200546
SECOR WwW,secorcom
INTERNATIONAL_ 11085 Knott Avenue Suite B
0 R INCORPORATED Cypiess, CA 90630
Tel: 714.379.3366
Fax: 714 379.3375
October 17, 2005
SECOR Job No. 14CP.86293.07.1424
Mr. Corey Walsh
Regional Water Quality Control Board
Central Coast Region
895 Aerovista Place, Suite 101
San Luis Obispo, California 93401-7906
Re. Interim Remedial Action Plan for Dewatering of Groundwater during Underground
Storage Tank System Removal
76 Service Station 6293
363 Santa Rosa Street
Sari Luis Obispo, California
Dear Mr. Walsh:
At the request of ConocoPhillips Company (CPC), SECOR International Incorporated
(SECOR) has prepared this Interim Remedial Action Plan (IRAP) proposing dewatering of
potential petroleum hydrocarbon impacted groundwater during underground storage tank
(UST) system removal activities to be performed at the referenced site (Figure 1). This IRAP
includes a brief discussion of site background, previous investigations, subsurface conditions,
proposed scope of work., and schedule.
SITE BACKGROUND
The site is an operating 76 Service Station located at the southern corner of the intersection of
Santa Rosa Street and Montalban Street in San Luis Obispo, California (Figure 1). The facility
currently includes two 12,000-gallon underground fuel storage tanks (USTs) located in the
northern portion of the site, and two product dispenser islands located in the northeastern
portion of the site. The site configuration is shown on Figure 2.
J PREVIOUS INVESTIGATIONS
In February 1997, the underground product piping was replaced at the site.
In September 1997, IT Corporation (IT) drilled seven exploratory borings, designated B-1
through B-7. Borings B-1 and B-4 were converted to groundwater monitoring wells MW-1 and
MW-4, respectively.
Interim Remedial Action Plan Proposing Groundwater Dewatering During
Underground Storage Tank System Removal
76 Service Station 6293
October 17, 2005
Page 2
In October 1998, IT installed well MW-5 in the northeastern area of the site.
In May 2003, SECOR installed offsite wells MW-7 and MW-8. SECOR was unable to install
well MW-6 during the May 2003 field event due to delays in the encroachment permitting
process. SECOR remobilized to the site in July 2003 to install. MW-6 in the left turn lane of the
northwest intersection of Santa Rosa Street and Montalban Street. Wells MW-6 through
MW-8 were installed to a depth of 15 feet below ground surface (bgs). Total petroleum
hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and
methyl tertiary butyl ether (MTBE) were not detected above laboratory reporting limits in
samples collected from the borings for wells MW-7 and MW-8. Total petroleum hydrocarbons
as diesel (TPHd) was reported in soil samples collected from MW-6 at a maximum
concentration of 19 milligrams per kilogram (mg/kg) (5.5 feet bgs).
In July 2003, Morrow Surveying (Morrow), of West Sacramento, California surveyed wells
l\AW-1 and MW-4 through MVV-8 to coordinate groundwater elevations with the wells at the
adjacent Chevron and Shell sites.
Between November 8 and 10, 2004, SECOR field staff supervised S&G Drilling during the
installation of three groundwater monitoring wells (MW-9, MW-10, and MW-11) in order to
delineate the lateral extent of the dissolved phase plume in the southlsoutheast direction at
the site. In addition, in order to expedite remediation of the dissolved phase hydrocarbons at
the site, SECOR also supervised the installation of three sparge wells (SP-1 through SP-3).
SENSITIVE RECEPTORS
According to the State Water resources Control Board Geotracker data base, no wells exist
within "/-mile of this site. SECOR contracted Environmental Data Resources to search
databases of existing wells within a one mile of the site. According to EDR, thirteen wells exist
within the search radius. A cluster of wells are located approximately 1/2-mile southeast (cross
gradient) of the site. The nearest known water well is approximately /4-mile southeast of the
site. The current well status is unknown. SECOR personnel visited the creek on April 28th
2005 and observed that the creel; was approximately 300 feet to the west of the site and
approximate 35 to 45 feet below grade with steep banks. The creel, was flawing at the time of
the site visit..
SUBSURFACE CONDITIONS
Sediments beneath the site consist predominantly of silt, sand, and gravel to a maximum
depth of 14 feet bgs. Shale and weathered shale begins at depths ranging from 4 to 14 feet
bgs and continues to the maximum depth explored (26 feet bgs). During the Second Quarter
2005 groundwater sampling event, groundwater was measured in on and off -site wells at
depths ranging between approximately 1.98 and 18.79 feet bgs. In regards to on site wells,
groundwater depths were measured between 2.01 feet bgs (MW-1) and 18.79 feet bgs
(MW-10). Groundwater beneath the site typically flows to the north. The regional
groundwater flow direction, shown by coordinated monitoring data since 2003, is generally to
the south/southwest.
-1 P:/conocaPhillips/Project Folders/6293/Work Plans/TRAP UST Overexcavation Dewatering 10.05 SECOR
Interim Remedial Action Plan Proposing Groundwater Dewatering During
Underground Storage Tank System Removal
76 Service Station 6293
October 17, 2005
Page 3
Tertiary butyl alcohol (TBA) has been consistently detected in groundwater samples collected
from on -site wells MW-1, MW-4, and MW-5 since TBA analysis was initiated in April 2001.
Historical TBA concentrations peaked in 2001 and have been declining since. The maximum
reported TBA concentration during the Second Quarter 2005 sampling event was
15,000 micrograms per liter (ug/1) in MW-4.
PROPOSED SCOPE OF WORK
During the removal of the UST system components (gasoline and waste oil USTS, dispensers
and product piping), SECOR will be on -site supervising the excavation of soil and dewatering
activities in the vicinity of the UST cavities at the location shown on Figure 2. Dewatering of
the UST cavities is required during the removal of the gasoline USTs and potentially the waste
oil UST. Work performed by SECOR personnel during UST removal, soil excavation and UST
cavity dewatering will be performed in accordance with this TRAP and the Field and Laboratory
Procedures provided in Attachment A. The specific scope of work is discussed below:
Health and Safety Plan. As required by the Occupational Health and
Safety Administration (OSHA) Standard "Hazardous Waste Operations and
Emergency Response" guidelines (29 CFR 1910.120), and by California
Occupational Health and Safety Administration (Cal -OSHA) "Hazardous
Waste Operations and Emergency Response" guidelines (CDR Title 8,
Section 5192), SECOR has prepared a site -specific Health and Safety Plan
(HASP) for use by SECOR personnel. SECOR Field staff will review the
HASP before beginning field operations at the site. SECOR personnel will
also incorporate the CPC site demolition contractor into the safety tail gate
meetings.
Dewatering of Groundwater. Due to shallow groundwater at the site, the
UST cavity will require dewatering during UST removal activities. The
necessary amount of groundwater will be dewatered from the UST
excavation and temporarily stored on -site in a 20,000-gallon Baker water
storage tank: pending analytical data. The amount of groundwater removed
is dependant upon the UST removal activities to insure a safe work
environment. It is anticipated that up to approximately 15,000 gallons of
groundwater may be extracted during the UST removal activities.
Soil Excavation. During UST removal activities, petroleum impacted soil
may be encountered in the areas surrounding the UST cavities, piping runs
and dispenser islands. During removal activities, impacted soil may be
excavated in an effort to remove secondary sources for groundwater impact.
The amount of soil excavation is dependant upon the areas of impact. If soil
impact is noted to be significant as determined by field monitoring with a
photo -ionization detector, it is anticipated that soil excavation will be
performed as a remedial alternative. Up to approximately 500 cubic yards of
impacted soil may be excavated for removal and disposal.
Soil and Groundwater Sample Collection and Analysis. Following the
soil excavation and groundwater dewatering activities, SECOR will collect
-J P:/ConocoPhiIli ps/Project Folders/6293/Work Plans/TRAP UST Overexcavation Dewatering 10.05 SECOR
Interim Remedial Action Plan Proposing Groundwater Dewatering During
Underground Storage Tank System Removal
76 Service Station 6293
October 17, 2005
Page 4
the necessary soil samples from the excavation sidewalls, if obtainable, and
water samples from the UST cavities and the on site Baker TM storage tank,
Soil and groundwater samples collected from the gasoline UST cavity will be
submitted for laboratory analyses for TPHd using EPA Method 8015M,
TPHg, BTEX and fuel oxygenates MTBE, ETBE, TAME, TBA, DIPE, 1,2-
DCA, and ethanol using EPA Method 8260B, and total lead using EPA
Method 6010B. Soil and groundwater samples collected from the waste oil
UST cavity will be submitted for laboratory analyses for TPHg, TPHd and
TPH as motor oil (TPHmo) using EPA Method 8015M, full scan volatile
organic compounds (VOCs) including fuel oxygenates MTBE, ETBE, TAME,
TBA, DIPE, 1,2-DCA, and ethanol using EPA Method 8260B, and Title 22
metals using EPA Method 6010B.
Waste Disposal. Groundwater generated during dewatered activities will be
temporarily stored in 20,000-gallon BakerTAA water storage tanks. Excavated
sail will be stockpiled on -site pending characterization and disposal. Filter
Recycling, of Calton, California (Filter Recycling) will transport the soil and
groundwater for proper treatment and/or disposal.
Report. After completion of field work and receipt of laboratory analytical
results collected during dewatering activities, SECOR will prepare a report
evaluating groundwater conditions at the site. The repart will include
groundwater analytical results, chain -of -custody records, and SECOR's
conclusions.
SCHEDULE
The UST system removal and site demolition is scheduled for mid November 2005. SECOR
and CPC will begin coordinating this work immediately upon approval of this IRAP by the
California Regional Water Quality Control Board, Central Coast Region.
IP:/ConocoPhillips/Project Folders/6293/work Plans/TRAP UST Overexcavation Dewatering 10.05 SECOR
Interim Remedial Action Plan Proposing Groundwater Dewatering During
1 Underground Storage Tank System Removal
76 Service Station 6293
October 17, 2005
Page 5
If you have any questions or need additional information, please contact Mr. Jason Kornes at
(714) 379-3366.
Sincerely,
SECOR International Incorporated
Prepared by
Reviewed and Approved by
Jason C. Komes Kelly C. rown, RG 6714
Project Scientist Principal Geologist
Attachments: Figure 1 — Site Location Map
Figure 2 — Site Plan
Attachment A — Field and Laboratory Procedures
cc: Ms. Shari Landon, ConocoPhillips Company (Electronic File)
Mr. D. Kerry Boyle, City of San Luis Obispo Fire Department
IP:/ConocoPhillips/Project Fold ers/6293/work Plans/TRAP UST Overexcavation Dewatering 10.05
SECOR
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FOR: FIGURE:
CONOCOPHILLIPS
76 STATION NO.6293 SITE LOCATION MAP
S E C O R SAN LUIS OBISPO, CALIFORNIA
11085 KNOTT AVENUE SUITE B
ORANGE COUNTY, CALIFORNIA JOB NUMBER: DRAWN BY: CHECKED BY: APPROVED BY: DATE:
PHONE: (714) 379-3366/379-3375 (FAX) 14CP.86293.01 T,ARCHIBALD M.CALKINS I K. BROWN 07/20/05
FILEPATH: X:\Cad 2003\Secor Out Office\Cypress Offic076 Station 6293\(;PR29,9 2SP riwp
ATTACHMENT A
FIELD AND LABORATORY PROCEDURES
Interim Remedial Action Plan for Dewatering of Groundwwater during
Underground Storage Tank System Removal
76 Service Station 6293
363 Santa Rosa Street
San Luis Obispo, California
II
I
I
ATTACHMENT A
FIELD AND LABORATORY PROCEDURES
Organic Vapor Procedures
The PID or FID will be calibrated prior to over -excavation activities. Results of the field-testing
will be noted on the field data sheets. PID and FID readings are useful for indicating relative
hydrocarbon levels, but cannot be used to evaluate petroleum hydrocarbon concentrations with
the confidence of laboratory analyses.
Soil and Groundwater Sampling Procedures
Soil and groundwater samples will be collected into appropriate EPA -approved containers,
labeled, logged onto a chain -of -custody document, and transported on ice to a California state -
certified laboratory for analyses.
Laboratory Procedures
Soil and groundwater samples will be shipped to the laboratory under chain -of -custody protocol
and analyzed for the presence of TPHd using EPA Method 8015M, and TPHg, BTEX and fuel
oxygenates MTBE, ETBE, TAME, TBA, DIPS, 1,2-DCA, and ethanol using EPA Method 8260B.
Excavated Soil and Removed Groundwater
Excavated soil cuttings and removed groundwater generated during over -excavation operations
will be stored at the site in pending characterization and disposal. The soil and ground water
will be removed from the site by Filter Recycling and transported to a California -licensed
disposal facility for proper disposal and/or treatment.
PACIFIC
ENVIRONMENTAL
GROUP INC.
May 20, 1997
Project 311-149.113
Ms. Tina Berry
Tosco Marketing Company
2000 Crow Canyon Place, Suite 400
San Ramon, California 94583
Re: Work Plan for Site Assessment
Unocal Service Station 6293
363 Santa Rosa Street at Montalban Street
San Luis Obispo, California
Dear Ms. Berry:
11Az MAT
On behalf of Tosco Marketing (Tosco), Pacific Environmental Group, Inc. (PACIFIC)
has prepared this, work plan to assess soil and groundwater conditions at the site
referenced above. This work plan was prepared in response to a city of San Luis Obispo
Fire Department (SLOFD) letter request dated March 7, 1997. The SLOFD requested
that a site assessment be performed to determine the extent of hydrocarbon -impacted soil
and groundwater beneath the service station property. This work plan includes discus-
sions of site background, the proposed scope of work, and an implementation schedule.
BACKGROUND
Facility Description
The project site is an operating Unocal service station located in the city of San Luis
Obispo. Facility features include two 12,000-gallon capacity gasoline underground stor-
age tanks (USTs); one 550-gallon waste oil tank; two dispenser islands; and a service
station building (Figure 1).
Previous Site Investigations
On February 2 and 8, 1997, the gasoline and waste oil USTs were uncovered and the
product and vapor recovery lines were excavated and removed. During excavation
activities, PACIFIC performed air monitoring and collected groundwater and
confirmation soil samples in areas approved by the SLOFD. Field procedures and soil
2025 Gateway Place, Suite 440, San Jose, California 95110 (408) 441-7S00 FAX (408) 441-7539
May 20, 1997
Page 2
and groundwater analytical data are documented in PACIFIC's Excavation A'fon7torr77g
and Samplh7g - Tank Top Replacement Report, dated April 4, 1997.
Groundwater was encountered within the UST excavations at a depth of approximately
4 feet below ground surface (bgs). Before completely uncovering the tanks, a water
collection trench was excavated near the southern end of the gasoline UST complex.
Approximately 5,200 gallons of groundwater was then pumped from the waste -oil and
gasoline UST excavations and was stored on site in a Baker tank.
A total of 11 confirmation soil samples were collected from beneath the dispenser islands
(D-1 through D-4) and product lines (PP-1 through PP-7) (Figure 1). In addition, one
water sample was collected from the dewatering trench located at the southeast corner
of the gasoline UST complex (GW-1), and one water sample (GW-2) was collected from
the Baker tank for profiling.
Total purgeable petroleum hydrocarbons calculated as gasoline (TPPH-g) was detected
in soil samples D-3 and D-4 at a concentration of 1.3 milligrams per kilogram (mg/kg).
Benzene was not detected in the soil samples at concentrations above laboratory method
reporting limit (MRL), and only minor concentrations of other toluene were detected in
soil samples D-2, D-3, and D-4.
Soil samples PP-1 through PP-6 contained no TPPH-g and BTEX compounds. Soil
sample PP-7 contained minor concentrations of toluene (0.009 mg/kg) and xylenes
(0.035 mg/kg).
The groundwater sample collected from the dewatering trench (GW-1) contained
TPPH-g at a concentration of 140 micrograms/liter (µg/L) and methyl.tert-butyl ether
(MtBE) at 140 µg/L. Benzene was not detected in sample GW-1 at a concentration
above the laboratory MRL. The groundwater sample collected from the Baker tank:
following all dewatering activities contained 2,400 µg/L TPPH-g, 33 µg/L benzene and
3,300 µg/L MtBE.
PROPOSED SCOPE OF WORK
To assess soil and groundwater conditions beneath the service station property,
PACIFIC will drill four exploratory borings and convert the borings into groundwater
monitoring wells designated MW-1 through MW-4 at the locations shown on Figure 1.
Boring MW-1 will be drilled to assess soil and groundwater conditions in the vicinity of
the gasoline UST complex, and Borings MW-2 through MW-4 will be drilled to further
assess the lateral extent of groundwater impact and to determine the groundwater
gradient and flow direction. Based on the south sloping local surface topography as well
as our discussigns with Regional Water Quality Control Board, Central Coast Region
staff familiar with local hydrogeologic conditions, it is anticipated that groundwater
beneath the site flows in a southwesterly to southeasterly direction. Groundwater is
anticipated to occur at depths between 5 and 15 feet bgs.
3111491 BrNRKPLN
May 20, 1997
Page 3
Task 1 - Prefield Activities
Prior to conducting field activities, PACIFIC will obtain well installation permits from
San Luis Obispo County, Department of Environmental Health (DEH). In addition,
PACIFIC will prepare a site -specific health and safety plan, schedule inspectors from the
appropriate agencies, and contact Underground Service Alert at least 48 hours before
initiating drilling activities.
Task 2 - Exploratory Soil Borings
Groundwater is anticipated to occur at depths between 5 and 15 feet bgs, therefore
exploratory Borings MW-1 through MW-4 will be drilled to a depth of between 15 and
25 feet bgs, or 10 feet below first encountered groundwater using continuous -flight,
hollow -stem auger equipment. The 8-inch diameter auger flights will be steam cleaned
prior to drilling each boring.
Undisturbed soil samples will be collected from the borings at 5-foot depth intervals
using a 1.5-foot long nominal 2-inch diameter, split tube -type sampler equipped with
brass sample liners. The sampler will be advanced into soil ahead of the lead auger using
a standard 140-pound slide hammer. Once a soil sample has been collected, the sampler
will be withdrawn from the auger and the sample liners will be removed. One sample
liner from each sampling interval will be retained, sealed with Teflon® tape and plastic
end caps, placed in an insulated cooler, and transported under chain -of -custody to a
state -certified laboratory for analysis. The soil samples will also be field screened for
organic vapors using headspace analysis and a photo -ionization detector (PID) calibrated
to 100 parts per million (ppm) isobutylene gas. A detailed log of the boring will be
recorded by a PACIFIC geologist based on the soil samples and auger return material.
Soil will be logged according to the Unified Soil Classification System (ASTM
C2488-69).
Soil cuttings generated during drilling activities will be stockpiled and covered with
plastic sheeting, and auger rinsate will be contained in labeled 55-gallon DOT -approved
drums. The stockpiled soil and drums will be stored on site pending consideration of
disposal options.
Task 3 - Well Completion
Exploratory Borings MW-1 through MW-4 will be converted into groundwater monitor-
ing wells by installing 2-inch diameter PVC blank and 0.02-inch slotted casing. The
wells will be screened from approximately 5 to 25 feet bgs. A filter pack of
Lonestar 2x12 sand will be placed in the annular space of each well from 1 foot above
the slotted interval to the total depth of each boring. A bentonite seal will be placed and
extend approximately 1 to 2 feet above the sand pack. The remaining annular space
surrounding the blank casing will be backfilled with Portland cement grout, or
3111491B/VaWLN
May 20, 1997
Page 4
equivalent, to approximately 1 foot bgs. Each well head will then be secured with a
lockable well cap, secured with a padlock and enclosed in a water -tight traffic -rated steel
well box set in concrete..
Task 4 - Well Development and Sampling
Monitoring Wells MW-1 through MW-4 will be developed to restore the natural
hydraulic conductivity of the formation, remove sediments from the well casing, and
stabilize the filter pack. Groundwater -level measurements will be recorded prior to
development, and the wells will be developed using a surge block and 2-inch diameter
submersible pump. During development, water will be purged and monitored for
turbidity, pH, temperature, and conductivity until these parameters stabilize.
Within 48 hours after being developed, the wells will be gauged, purged of three to four
casing volumes of groundwater, and monitored for the above parameters. When the
groundwater parameters stabilize groundwater samples will be collected from the wells.
The groundwater samples will be transferred to containers appropriate to each EPA
analytical method being used. The samples will be labeled, stored in a chilled cooler, and
transported to a state -certified laboratory along with the chain -of -custody
documentation.
Purge water generated during well development and sampling activities will be
transported off site for treatment and recycling at Tosco's Rodeo Refinery.
Task 5 - Laboratory Analyses
Selected soil and groundwater samples from Wells MW-1 through MW-4 will be
analyzed for TPPH-g and benzene, toluene, ethylbenzene, and xylenes by EPA
Methods 8015 (modified) and 8020, respectively. In addition, the groundwater samples
will be analyzed for MtBE by EPA Method 8020. The maximum concentration of
MtBE, if detected, will be confirmed by EPA Method 8260.
Task 6 - Report Preparation
Following completion of the field activities and receipt of the analytical results, the data
will be evaluated. A summary report of the findings will be prepared that will include the
following:
■ Description of previous site investigation activities.
■ Regional and site -specific geology and hydrogeology.
• Description of field procedures.
• Exploratory boring logs and well construction details.
• Updated site map.
3111491 BAVRKPLN
May 20, 1997
• Page 5
■ Results of chemical analysis of soil and groundwater samples with
copies of certified analytical reports and chain -of -custody documenta-
tion.
* A discussion of findings and conclusions.
SCHEDULE
PACIFIC is prepared to implement the scope of work upon approval of the work plan by
the SLOFD. Monitoring well installation permit applications will be forwarded to the
DEH during May 1997. We anticipate that the field activities will be completed in June
and a summary report documenting the results of the investigation will be submitted to
the SLOFD in July 1997.
Should you have any questions or require additional information, please call.
Sincerely,
Pacific Environmental Gro C.
JOSEPH J. MUZZ10��
No. j672
qJ Muzzio CERTIFIED k
Project Geologist ENGINEEN140
CEG 1672 GEOLOGIS �P
9rF OF c uFo-
Attachments: Figure 1 - Pro onitoring Well Location Map -
cc: Mr. Frank DeMarco, Regional Water Quality Control Board, Central Coast Region
Mr. Spencer Meyer, City of San Luis Obispo Fire Department
3111491 B/VJRKPLN
PLANTER
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APPROXIMATE EXTENT MW-3
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APPROACH
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APPROACH
SANTA ROSA STREET
LEGEND
D-4, PP-7 ■ SOIL SAMPLE LOCATION AND DESIGNATION
GW-I+ GROUNDWATER GRAB SAMPLE LOCATION
AND DESIGNATION
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WELL LOCATION AND DESIGNATION
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Reference: 911/149/Sllemp20.n d