HomeMy WebLinkAboutHAZ-BUSINESS PLAN 7/1997 Groundwater Scientists ° Environmental Consultants r~,! .........
JULg11997 :""
July, 1997 Quarterly Groundwater Monitorin
F:ormer Auto Club of Soutkern California
2301 "F" Street
Bakersfield, California
Presented To:
Mr. Herman Fuette
Manager - Security and Building Services
Automobile Club of Southern California
For Submittal To:
-~--- Mr. Howard Wines
',, City of Bakersfield Fire Department
Hazardous Materials Division'
Presented By:
AquaGeosciences, Inc.
July, 1997
' .~
" ' Gl R #4779 .
Principal Hydrogeologist
Registration Expires 11/30/98 '
4440 Orisgom Street, Suite 100 ' Bakersfield, California 93313
(805) 836-8100 ° FAX (805) 836-8800
(800) 301-4244
TABLE OF CONTENTS
PAGE #
1.0 Introduction 2
2.0 Background 2
2.1 Project History 2
3.0 Groundwater Monitoring 4
3.1 Groundwater Elevation 4
3.2 Groundwater Well Purging and Sampling 5
3.3 Groundwater Analytical Results 5
4.0 Conclusions 5
5.0 Recommendations 6
6.0 Limitations 7
Exhibit 1- Vicinity Map
Exhibit 2- Site Map
Table 1-Historical Groundwater Depth and Analytical Data
Appendix A- Purge Data Sheets
Appendix B- Chain-of-Custody and Analytical Results
1.0 Introduction
On July 3, 1997, AquaGeosciences, Inc. (AGI) conducted groundw.ater monitoring at
the former Auto Club of Southern California site located at 24th and F Street in
Bakersfield, California. The single monitoring well located at the site was gauged,
purged, sampled, and samples submitted for analysis. This report documents the field
activities, observations, and results of the quarterly monitoring event.
2.0 Background
The site is located at 2301 "F" Street in Bakersfield, California as shown on Exhibit 1.
2.1 Facility Description
The property is currently unoccupied ~and the Auto Club of Southern California is
marketing the property for sale (Exhibit 2).
2.2 Project History
In 1991, RESNA was contracted to perform a Phase I Real Estate Site Assessment at
the former Auto Club of Southern California site located at 2301 "F" Street, Bakersfield,
California. RESNA indicated that a gasoline service station was previously operated
in the northeast portion of the subject property. According to information obtained from
the City of Bakersfield Building Department, the station was apparently demolished in
1977 and records were not available regarding underground tank removal or
abandonment.
On October 21, 1991, Spectrum Environmental Geophysics conducted a geophysical
survey at the subject site to evaluate the presence of underground tanks. Two (2)
magnetic anomalies were detected; however, the ground penetrating radar signatures
of the anomalies did not indicate the presence of underground storage tanks.
On November 14, 1991 RESNA conducted a Phase II investigation which consisted of
advancing three (3) soil borings to evaluate possible hydrocarbon contamination. Soil
borings B-1 and B-2 were advanced to 20 feet and B-3 was advanced to 40 feet. Six
(6) soil samples were submitted and analyzed for Total Petroleum hydrocarbons as
gasoline (TPHg), BTEX, and Total Recoverable Petroleum Hydrocarbons (TRPH). The
analytical results indicated non-detect to Iow concentrations of hydrocarbons in the
samples collected from soil borings Bo2 and B-3. The highest concentrations were
detected in boring B.I, which was subsequently (November 22, 1991) deepened to 45
feet. The analytical results from. soil boring sample B-1 at 40 feet indicated a TPHg
concentration of 2100 mg/kg. Based on the analytical results, the City of Bakersfield
Fire Department, Hazardous Materials Division (BFDHMD) was notified.
2
The BFDHMD sent a letter, dated December 2, 1991 to the Auto Club of Southern
California requesting that .a site assessment be conducted in 'accordance with the
Regional Water Quality Control Board (RWQCB) guidelines for evaluation of
contaminant migration in the subsurface soils at the subject site.
On February 3 and 4, 1992, RESNA advanced five (5) additional soil borings.. Soil
boring B-4 was advanced 5 feet west of soil boring Bo1 to determine the vertical extent
of hydrocarbon contamination. Due to auger refusal at 72 feet, two (2) consecutive
non-detected soil samples were not obtained. Soil borings B-5, B-7, and B-8 were
advanced to a depth of 30 feet each and B-6 was advanced to 35 feet, all to evaluate
the lateral extent of contamination.
Eight (8) soil samples were submitted and analyzed for TPHg and BTEX. The
analytical results indicated that the highest concentrations were detected in the 60 foot
sample of soil boring B-4. The concentrations detected in the 72 foot sample indicated
rapid attenuation and the vertical limits of the plume had been estimated to be
approximately 80 feet. RESNA, in their report dated February 24, 1992, presented an
interpretation of the vertical and lateral extent of the gasoline impacted soil plume.
Their interpretation indicated the plume had migrated to a depth of approximately
twenty (20) feet. The volume of impacted soil is estimated to be 2,250 cubic yards
containing an estimated 8,000 pounds of gasoline hydrocarbons.
On August 5 and 17, 1992, RESNA advanced a total of five (5) vapor extraction wells.
Two (2) of the wells are located in the center of the plume and were screened in
separate zones (shallow 15-45' and deep 45-70'). These wells were to be used as the
primary extraction wells. The remaining three (3) wells are located around the
perimeter of the plume and are screened from 15-55', 20-60', and 20-60', respectively.
These wells are to be used as inlet wells. On September 10, 1992, RESNA set up a
portable Granular Activated Carbon Vapor Extraction System on the site. The system
was run for a period of two (2) hours under a SJVUAPCD permit exemption. Based on
the data generated from this vapor extraction feasibility study, it appeared that the
current well configuration would be sufficient to effectively remediate the entire
impacted soi~ mass.
Based on RESNA's findings, the presence of gasoline hydrocarbons in soils at the site
were in excess of the California Regional Water Quality Control Board - Central Valley
Region Leaking Underground Fuel Tank leaching potential guidelines. RESNA felt
remedial action would be required by the interested regulatory agencies. In-situ vapor
extraction was recommended as the most effective and cost competitive option
available to cleanup the site.
AGI reviewed the Site Assessment Report and Remedial Action Plan, dated February
24, 1992 and a Vapor Extraction Pilot Test Report dated October 8, 1992, prepared by
RESNA Industries. After reviewing the results and conclusions of the vapor extraction
feasibility study, AGI recommended that a electrically-heated Catalytic oxidizer be used
3
for on-site remediation. AGI's proposal was accepted by the Auto Club of Southern
California in December, 1994.
Constructi°n of thevap0r extraction system was conducted from May 1 to May 8, 1995.
Final installation and startup procedures were conducted on May 15 to May 19, 1995.
Remediation operations were on-going from May 15, 1995 to June 25, 1996 when the
machine was shut down under authorization by the SJVUAPCD inspector. In August,
1995, three wells, VI-3, VIo4, and VI-5, were converted to aggressive inlet well at the
manifold by installation of a 1.5 Hp Rotron blower injecting ambient air directly into the
wells. The three inlet wells were returned to passive inlet wells in October, 1995.
In April, 1996, decreases in influent concentrations to approximately 1% LEL were
interpreted to indicate that soil concentrations were significantly reduced. The vapor
extraction system had logged a total running time of 8,245 hours. In response to the
decreased influent concentrations, AGI advanced a confirmation boring, C-1, on June
11, 1996. Evidence of groundwater was indicated at approximately 66 ft bgs and the
soil boring was converted to a groundwater monitoring well. The monitoring well was
sampled on June 17, 1996 and analytical results were non-detect for TPH as gasoline,
TPH as diesel, and VOC's benzene, ethylbenzene, toluene, and total xylenes. Based
on the results of the confirmation boring and groundwater sampling, a Soil
Remediation Closure Report was submitted by AGI.
In the City of Bakersfield Fire Department letter dated July 11, 1996, the City of
Bakersfield concurred that no further remediation of the site was necessary at that time
and that groundwater will continue to be monitored for three (3) consecutive quarters
prior to closure.
On November 27, '1996, AGI conducted groundwater monitoring and sampling of the
single well located at the site.
On February 25, 1997, AGI conducted groundwater monitoring and sampling of the
single well located at the site.
On July 3, 1997, AGl~conducted groundwater monitoring and sampling of the single
well located at the site.
This report documents the methods implemented and results of the quarterly
monitoring event.
'3.0 Groundwater Monitoring
On July 3, 1997 AGI personnel collected depth to groundwater and a sample from the
one (1) monitoring well located at the Auto Club site. Groundwater sampling
procedures, observations, and results of laboratory analyses are addressed in the
following sections.
4
3.1 Groundwater Elevation
With a Solinst level indicator, groundwater elevation measurements to the nearest
0.01 foot were collected in all wells from the top of casing (TOC). The instrument taPe
was decontaminated in a solution of Alconox and rinsed in clean water prior to use in
the well.
Depth to groundwater data for February 25, 1997 and historical data are presented in
Table 1. Since November 27, 1996 the water level has risen approximately 6.81 ft in
the monitoring well. The depth to groundwater was measured at 57.19 ft bgs.
TABLE 1
HISTORICAL GROUNDWATER DEPTH
AND
ANALYTICAL DATA
Former Auto Club of Southern California
Bakersfield, California
WELL WELL DEPTH TO ETHYL TOTAL
NUMBER DATE DEPTH GROUNDWATER BENZENE TOLUENE BENZENE XYLENE TPHg
(ft) (ft) (Hg/L) (~tg/L) (pg/L) (Hg/L) (l~g/L)
MW-1 6/17/96 85 69.28 ND ND ND ND ND
11/27/96 85 64.00 ND 17 ND 227 1450
2/25/97 85 59.80 ND 41.0 5.9 18 113
7/3/97 85 57.19 ND ND ND 180 5100
ND = Non-detectable
NA = Data Not Available
NS= Not Sampled
3.2 Groundwater Well Purging and Sampling
The monitoring well was purged before the groundwater sample was collected. Using
a pneumatic operated submersible purge pump, a minimum of three well casing
volumes were removed from the well. During purging, groundwater temperature, pH,
and conductivity were periodically measured to insure stabilized well conditions prior
'to sampling. The purge data sheet for the well is included as Appendix A.
The monitoring well was sampled using a disposable bailer. A groundwater sample
and duplicated sample were decanted into four 40 milliliter volatile organic analysis
(VOA) vials. Care was taken to ensure no headspace or bubbles existed and the vials
were sealed with Teflon-lined lids. The samples were placed in an iced cooler at 4°C
5
and transported under chain of custody control to Halcyon Laboratories of Bakersfield,
California, a State of California certified laboratory, for the analyses requested.
3.3 Groundwater Analytical Results
One (1) groundwater sample and one (1) duplicate sample were collected from the
Auto Club site, and were analyzed for total petroleum hydrocarbons as gasoline
(TPHg) and the volatile aromatics: benzene, toluene, ethylbenzene and xylene (BTEX)
using EPA Methods 5030 and 8020, respectively.. Laboratory analysis reported
concentrations of TPHg and total xylenes of 5100 pg/L and 180 pg/L, respectively.
Groundwater concentrations of benzene, toluene, and ethylbenzene were non-detect.
Groundwater concentrations of TPHg and total xylenes increased while toluene and
ethylbenzene'decreased from the February, 1997 sampling event. The groundwater
concentrations for benzene have resulted in non-detect for four consecutive quarterly
sampling events.
4.0 Conclusions
The results of the July, 1997 monitoring event indicate that the depth to groundwater
has decreased bY approximately 6.81 ft, (ie...groundwater has risen 6.81 feet).
The groundwater concentrations of TPH as gasoline and total xylenes increased while
toluene and ethylbenzene decreased to non-detect from the February, 1997 quarterly
event.
The groundwater concentrations of benzene have been non-detect for four
consecutive quarters, while groundwater has continuously rose.
5.0 Recommendations
While groundwater has risen for four consecutive quarterly monitoring events, BTEX
components toluene and ethylbenzene and benzene concentrations have been
measured as non-detect. Based on these results, it is AGI's opinion that the soil plume
has been adequately remediated, with remaining soil concentrations within the range
of natural biodegradation processes (AGI, June, 1996). Additionally, groundwater
should begin to decrease with season fluctuations, reducing further any potential
impacts to groundwater. AGI recommends site closure after one (1) additional
quarterly monitoring event should the results of the additional monitoring indicate a
.similar or decreasing trend.
6
6.0 Limitations
AGI performed this investigation in accordance with generally accepted standards of
care which exist in Central California at this time. It should be recognized that
definition and evaluation of geologic conditions is a difficult and inexact art.
Judgments leading to conclusions and recommendations are generally made with
limited knowledge of subsurface conditions present. No warranty, expressed or
implied, is made.
24 th Street
~'~ sidewalk
existing
wells o
N ° o
= Monitoring
Well Location
Crosstown
Liquors
.~~ ~ Parking
overhead
power
lines
Former ..~
Auto .~
Club ~
Parking u_
23 rd Street
AquaGeosciences, Inc. Exhibit
4440 Grissom St. Suite 100 Auto Club of Southern California
Bakersfield, California 93313 Bakersfield, California1
Telephone: (805) 836-8100 Site Map
Fax: (805) 836-8800
24 th Street
13-5
B-2 VI-3 V~
VW-1
B-6 B-4'~'B-1 B~8
~ _
¢~ MW-1
<~ (asphalt surfacing) V~,4
13-3
£xplanation
Confirmation 13odng Location
0
t-.-
(converted into Monitoring well)
O
B-2 Soil ,~ ,~'~or'n~ Location Z ,
· 0 1 inch
I I
V~,-4~^~ Vapor Well Location 0 20 ft
AquaGeosciences, Inc. Site and Boring Location Map Exhibit
4440 Grissom Street, Suite 100
Bakersfield, CA 93313 Auto Club of Southern California 2
2301 F Street
Tele: (805) 836-8100 Bakersfield, California
Fax: (805) 836-8800
AquaGeosciences, Inc. WATER QUALITY SAMPLING RECORD
-'- Groundwater Scientists · Environmental Consultants
AND WELL DEVELOPMENT DATA
4440 Grissom_. Street, Suite 100. · Bakersfield, California 93313
I ISAMPLE WELL NO.: DEPTH TO WATER:
57.19'
ID
OR
MW-1
PROJECT NO.: TOTAL DEPTH OF WELL:
PROJECT NAME: AUTO CLUB OF SO. CALIFORNIA WELL DIAMETER: 2"
DATE: JULY 3, 1997 CASING VOLUME: 4.0 GALLONS
SAMPLED BY: T~M REED METHOD OF PURGING: BENNE'FI' PUMP
PURGE CHARACTERISTICS SEC SAMPLE REMARKS
TIME INTAKE RATE CUM. VOL. WELL VOL TEMP pH (pmhos/ CONTROL
DEPTH (GPM) (GAL) PUMPED (cc) (UNITS) cm) NO. (COLOR, TURBIDITY, ETC.)
1235 75' 10 2.5 79.2 6.58 275 vy. It. brn, fnt odor
1240 75' 15 3.75 78.1 6.44 271 clear, fnt odor
1244 75' 20 5.0 78.1 6.50 268 clear, fnt odor
1247 75' 25 6.25 78.7 6.33 267 clear, fnt odor
1250 75' 30 7.5 77.9 6.29 264 clear, fnt odor
1253 75' 35 8.75 78.2 6.29 257 clear, fnt odor
1256 75' 40 10.0 79.4 6.30 255 clear, fnt odor
Refill Compressor- Delay
1330 75' 45 11.25 79.3 6.27 276 clear, fnt odor
1335 75' 50 12.5 78.0 6.30 261 clear, fnt odor
pH CALIBRATION / STANDARDIZATION 1345 - MW-1 SAMPLE
BUFFER SOLUTION pH 4.01 ! pH 7.0 )H 10.0
TEMP °C
INSTRUMENT READING
SPECIFIC ELECTRICAL CONDUCTANCE - CALIBRATION / STANDARDIZATION
KCL SOLUTION pMHOS / CM @ 25° C 74 718 1413 6868 58640
TEMP °C
INSTRUMENT READING
SAMPLED AT _1345__ FT. FINAL DEPTH TO WATER _65.00__ FT. 3 CASING VOLUMES =_12.0_GALS.
Hellion Laboratories
4440 Grissom St. Suite 100 Chainof.CustodyForm
Bakersfield, CA 93313 (805) 836-8100 Fax: (805) 836-8800
Lab No. 1020
Client Name: /~-~'~ ~'{~r~ Analysis Requested Matrix
~roioct ~amo:
~ ~ Aqueous
Address: < m ~ Soil
Phone:
Pr°jectManager: ~ ~~ Fax:
Sampler Name: ~ ~
~ato & limo Samplo ~escdption & Container ~ ~ ~ ~ ~ ~ Comments
Sample No. Sampled
Relinquished : Date & Time:.. /~,,j~
Received By: ~ ~ Date & Time: ~'~ Received By: Date & Time:
Ha c onorator s, nc. Certificate No. 1920
Client: Aqua Geosciences Project Name: Auto Club
Address: 4440 Grissom St. Suite 100 Matrix: Soil
City/Stste/ZIP: Bakersfield, CA 93313
Analyst: Robert Michels
Phone: (805) 836-8100
Date Received: Jul 3, 1997
FAX: (805) 836-8800
Date of Analysis: Jul 3, 1997
Attention: Bob Martin
Date of this Report: Jul 11, 1997
Sampled By: Tim Reed
Analysis Performed: BTEX and MTBE by purge and trap (EPA Method 5030/8020)
TPH as gasoline and/or Diesel by California Luff Manual
Total Recoverable Petroleum Hydrocarbons by 418.1
Lab Number: 970860 970861
Date Sampled: Jul 3, 1997 Jul 3, 1997
Sample Description: MW-1 Duplicate DL
Units: ug/L ug/L ug/L
Benzene: ND ND 0.05
Toluene: ND ND 0.05
Ethyl Benzene: ND ND 0,05
Total Xylenes: 180 200 0.05
TPH as Gasoline:i 5100 4300 $0
DL: Detection Limit- the least amount of analyte that can be detected and reported.
ND: Not Detected- the analyte was present below the DL and could not be detected and reported.
NA: Not Analyzed- analysis for this analyte was not performed.
Robert Michels
Laboratory Director
RPT0860. ~?.~.0 Grissom St. Suite 100, Bakersfield, CA 93313 Phone: (805) 836-8100 FAX: (805) 836-8800