HomeMy WebLinkAbout3303; Agua Hedionda Sewage Pump Station; Agua Hedionda Sewage Pump Station; 1991-07-10LEICHTON AND ASSOCIATES, INC
Geotechnical and Environmental Engineering Consultants
July 10, 1991
Project No. 4901121-04
To:
Attention:
Subject:
Reference:
County of San Diego
Environmental Health Services
Hazardous Materials Management Division
P.O. Box 85261
San Diego, California 92138-5261
Mr. Mo Lahsaie
Additional Requested Information Regarding Soil Sampling at the Agua Hedionda
Sewage Pump Station, Carlsbad, California
Leighton and Associates, Inc., 1991, Additional Verification Soil Sampling at the
Aqua Hedionda Sewage Pump Station, Carlsbad, California, Project No. 4901121-04,
dated June 25
In accordance with your request during our telephone conversation on July 10,1991, we are providing
the additional information.
1. Question: What is the fate of the existing stockpile?
Answer: It is our understanding that the City of Carlsbad intends to utilize the stockpile soil
as fill material and to leave the soil stockpile in its present location (see Figure 2 of
the referenced report). The stockpile will be covered with clean fill soil to prevent
volatilization. It is also our understanding that the stockpile is currently covered
with plastic sheeting.
2. Question: What reference was used to determine that the depth to ground water beneath the
stockpiled soils is greater than 15 feet?
Answer: The soil stockpile is located at the top of a cut slope 25 feet south of the pump
station and at an elevation 13 feet above the pump station (see Figure 2 of the
referenced report). Soil samples were collected at a depth of 3 feet below grade of
the pump station. Ground water was not encountered in the excavations from which
the soil samples were collected. Therefore, it was interpreted that the ground water
table is greater than 15 feet below the base of the soil stockpile. In addition, seeps
were not observed in the cut slope between the soil stockpile and the pump station.
3934 MURPHY CANYON ROAD, SUITE B205, SAN DIEGO, CALIFORNIA 92123 (619) 292-8030 • (800) 447-2626
FAX (619) 292-0771
4901121-04
If you have any questions regarding our letter, please contact this office. We appreciate this
opportunity to be of service.
Respectfully submitted,
LEIGHTON AND ASSOCIATES, INC.
Lyne Perry
Senior Staff Geologist
LJP/lk
Distribution: (1) Addressee
(1) Regional Water Quality Control Board
Attention: Mr. Jim Munch
(1) City of Carlsbad
Attention: Mr. Jay Hall
-2-
LEICHTON AND ASSOCIATES, INC
Geotechnical and Environmental Engineering Consultants
ADDITIONAL VERIFICATION SOIL
SAMPLING AT THE AGUA HEDIONDA SEWAGE
PUMP STATION, CARLSBAD, CALIFORNIA
June 25, 1991
Project No. 4901121-04
Prepared For:
CITY OF CARLSBAD
2075 Las Palmas Drive
Carlsbad, California 92009
3934 MURPHY CANYON ROAD, SUITE B205, SAN DIEGO, CALIFORNIA 92123 (619) 292-8030 • (800) 447-2626
FAX (619) 292-0771
LEIGHTON AND ASSOCIATES, INC
Geotechnical and Environmental Engineering Consultants
June 25,1991
Project No. 4901121-04
To: City of Carlsbad
2075 Las Palmas Drive
Carlsbad, California 92009
Attention: Mr. Jay Hall
Subject: Additional Verification Soil Sampling at the Agua Hedionda Sewage Pump
Station, Carlsbad, California
Introduction
Leighton and Associates, Inc. is pleased to submit this report which includes a discussion of the
results of the additional verification soil sampling at the subject site. The objective of this
additional soil sampling was to provide verification data as required by the San Diego Department
of Health Services, Hazardous Materials Management Division (HMMD) in their letter dated
May 9,1991, regarding the lateral extent of petroleum hydrocarbon contamination in the former
fuel supply line trench.
The scope of work for the subject investigation included collection of soil samples east,
northeast, and south of the former fuel supply line trench, laboratory analyses of two soil
samples, and preparation of this report. The following report includes a map showing the
location of the soil samples, the results of the field investigation, a discussion of the laboratory
results, and conclusions and recommendations.
Accompanying Illustrations and Appendices
Figure 1 - Site Location Map - Rear of Text
Figure 2 - Location of Soil Samples - Rear of Text
Figure 3 - Geologic Cross Section A-A' - Rear of Text
Table 1 - Summary of Results of Laboratory Analyses - Rear of Text
Appendix A - References
Appendix B - Laboratory Analysis
3934 MURPHY CANYON ROAD, SUITE B205, SAN DIEGO, CALIFORNIA 92123 (619) 292-8030* (800) 447-2626
FAX (619) 292-0771
& 4901121-04
^ Site Description and Background
« The site is a sewage pump station that is part of a sewage pipeline system that boosts sewage
J up to a topographically higher level so that it can be routed to a nearby treatment plant. The site
is located near the south side of the Agua Hedionda lagoon, east of the railroad tracks and
_ 2,500 feet northeast of the San Diego Gas and Electric (SDG&E) Encina Power Plant on Carlsbad
J Boulevard (Figure 1). The site can be accessed via a dirt road which runs parallel with the
railroad tracks and immediately east of the tracks. The dirt road can be accessed through the
SDG&E plant.
4 In addition to being powered by electricity, the pump housed at the site has an emergency
generator which is fueled by an underground diesel fuel storage tank. The emergency generator
m is used to operate the pump station facility during interruptions in San Diego Gas and Electric
4 (SDG&E) electrical power service. According to City of Carlsbad representatives, the fuel tank
was installed in 1977, and is 1,000 gallons in capacity and made of reinforced fiberglass.
<i The City of Carlsbad had indicated to Leighton and Associates that a release had occurred from
a pipe fitting in the fuel supply line from the tank to the generator. The release was discovered
*" subsequent to removal of the tank and associated piping on July 25,1990. Subsequently, the
«• city contracted Leighton and Associates to collect soil samples from the pipeline and tank
excavation for analysis to evaluate which areas of soil had been contaminated by the release.
^ On July 25, 1990, Leighton and Associates collected two soil samples from the pipeline
excavation (P-10-2' and P-21-2') at a depth of 2 feet below grade at the locations shown in
— Figure 2. Each sample was analyzed by the laboratory for fuel hydrocarbons by Modified EPA
Method 8015/DOHS. The results of these analyses are summarized in Table 1 and indicate that
"" fuel hydrocarbons were not detected above the laboratory detection limit in soil sample P-10'-2.
M However, fuel hydrocarbons were detected in soil sample P-21-2' at a concentration of
4,100mg/kg.
„, As a result of the above data, the City of Carlsbad excavated the soil in the area of soil sample
P-21-2' to a greater depth to remove hydrocarbon containing soil at a concentration above 100
* mg/kg (approximately 1 cubic yard). On August 9,1990, Leighton and Associates collected an
additional soil sample (T-1-41) from the excavation in this area, and four soil samples (SP-1
through SP-4) from the stockpile produced by tank excavation. The soil samples were analyzed
•* for fuel hydrocarbons and organic lead by EPA Method 6010. Soil samples T-1 -4' and SP-4 were
also analyzed by EPA Method 8020 for benzene, toluene, ethylbenzene and total xylenes (BTEX).
m
The trench has been backfilled with clean soil and a building has been constructed over the
1 former diesel fuel line trench. The data indicates that fuel hydrocarbons and BTEX were not
tf detected above the laboratory reported detection limit in soil sample T-1-4'.
m
m
4
4
i
Hi 4901121-04
*•
gi Field Investigation
2 On June 3, 1 991 , Leighton and Associates collected four soil samples south, east, and northeast
of previously collected soil sample P-21 -2'. These soil samples were collected at depths of 2 and
3 feet below ground surface. Soil was first excavated to a depth of 1 foot utilizing a shovel. Soil
^ was then further excavated to depths of 2 to 3 feet utilizing a hand auger. The soil samples were
j collected using a hand auger which was cleaned in a solution of trisodium phosphate (TSP) and
*' water and rinsed with deionized water prior to the collection of each sample. After collection,
each sample was placed in a laboratory supplied glass jar with a Teflon-lined cap and placed in
1 an ice-cooled container awaiting delivery to Analytical Technologies, Inc. (ATI) for analysis. The
*" two samples located 2.5 feet east of the previous soil sample P-21 -2' were analyzed by the
laboratory for fuel hydrocarbons by EPA Method 801 5/DOHS. Soil sample SS1 at 2 feet was
^ further analyzed for BTEX and organic lead by EPA Test Methods 8020 and 601 0, respectively.
* The remaining soil samples were held for possible future analysis.
m Visual or olfactory evidence of petroleum hydrocarbon contamination was not observed in the
m soil samples.
** Verification soil samples could not be collected to the north or west of soil sample P-21 -2' due
« to a recently constructed block building.
*•»
m Laboratory Results
— The results of analytical analyses are summarized in Table 1 and presented in Appendix B.
Chain-of-Custody forms and QA/QC data is also included in Appendix B. The data indicates that
** fuel hydrocarbons, BTEX, and organic lead were not detected above the laboratory reported
«. detection limit in soil sample SS1 at 2 feet. In addition, fuel hydrocarbons were not detected
above the laboratory reported detection limit in soil sample SS2 at 3 feet.
m Conclusions and Recommendations« -
Based on the results of this field investigation, the following conclusions and recommendations
are presented.
m
Following the determination that 4,100 mg/kg (as diesel) of fuel hydrocarbons were previously
m detected in soil sample P-21 -2', the excavation in the area of this sample was deepened to 4 feet.
* Soil sample T-1 -4' was previously collected from the base of the trench and below the point
where soil sample P-21 -2' was collected. Additional verification soil samples SS1 at 2 feet andm SS2 at 3 feet were collected on June 6, 1 991 , at 2.5 feet east of soil sample P-21 -2' in order to
a define the lateral extent of hydrocarbon contamination. Fuel hydrocarbons were not detected
in these samples. Therefore, it is our opinion that the petroleum hydrocarbon affected soil
1 (approximately 1 cubic yard) was removed from the trench excavation.
- 3 -
4901121-04
•?
•HI
m
Based upon the results of this investigation, we recommend no further action be performed at
this time.
The HMMD and RWQCB must agree with this recommendation before the City of Carlsbad can
receive a site closure letter from these two regulatory agencies.
Based on conversations with HMMD's case worker Mr. Mo Lahsaie at the site on May 24,1991,
the stockpile soils (see Figure 2 for location) can be disposed of at a Class III Landfill (with
HMMD and RWQCB approval letter) or can be utilized on site as fill material as long as the soils
are not placed within 5 feet of the ground water table (i.e. their current location is greater than
15 feet above the water table) and are covered with clean fill soil to prevent volatization.
If you have any questions regarding our report, please do not hesitate call us. We appreciate
this opportunity to be of service.
Respectfully submitted,
LEIGHTON AND ASSOCIATES, INC.
Lyne Perry
Senior Staff Geologist
Thomas E. Mills, RG 4439
Chief, Environmental Services
LJP/TM/mw
Distribution:(3) Addressee
(1) County of San Diego
Environmental Health Services
Attention: Mr. Mo Lahsaie
(1) Regional Water Quality Control Board
Attention: Mr. Jim Munch
- 4 -
<tf
m
SITE LOCATION MAP
Base Map: Aerial-Foto Map Book, 1986-87, page 7D
Original by Aerial Graphics.
AGUA HEDIONDA
CITY OF CARLSBAD
Project No 4901121-04
Date 6/25/91
1040 889
Figure No. 1
*—*-
Former stockpile
gravel and soil Excavation
(5 yrds*) \ "_\
/ \
I \
\ \
\ I
Newly Constructed
Building
Gravel!
Above
ground tank
| Soil /
ssi e 2' iI' ISS2 9 3'
I8'"2)
Generator
Former stockpile
gravel and soil
(9 yrds*)
Stockpile
ASP-6
LEGEND
Soil sample location,
SS1 « 2' designation, and depth in
feet, collected on 6-3-91
SP-7
Relocated sol stockpile (9 yd*) and
addttional soil from excavating
activities in Jury and August 1990
(total 78 yd3)
SP-8
JO
Approximate Scale
4.0 feet
1-N-11.0' Soil sample location, designation and depth in feet, collected on 7-25-90
Soil sample location and designation, collected on 8-9-90
§Oj| sample location and designation, collected on 1-18-91
A' Cross section A-A'
SOIL-SAMPLE LOCATIONS
SEWAGE
PUMP STATION
Project No. 4901121-04
Scale 1fe20'
Engr./Geol. JAH/LJP
Drafted By JK Revised n
1042 839
Date
e/oc/n-* I"*' °°y
4/19/91 6/25/91 RgureNo. 2
TABLE 1
SUMMARY OF RESULTS OF ANALYSIS OF SOILS SAMPLES
Sample
1-N-11.0'
1-S-10.5
P-10-2'
P-21-2'
T-1-4'
SP-1
SP-2
SP-3
SP-4
SP-5
SP-6
SP-7
SP-8
SS1 @ 2'
SS2 @ 3'
SS3 @ 2'
SS4 @ 2'
Date
Sampled
7/25/90
7/25/90
7/25/90
7/25/90
8/9/90
8/9/90
8/9/90
8/9/90
8/9/90
1/18/90
1/18/90
1/18/91
1/18/91
6/3/91
6/3/91
6/3/91
6/3/91
Fuel
Hydrocarbons(1 )
ND(5)
ND
ND
4,100
ND
300
ND
330
140
49
120
62
ND
ND
ND
B(2)
ND
ND
ND
ND
T(2)
ND
ND
ND
ND
E(2)
ND
ND
ND
ND
X(2)
ND
ND
ND
ND
Organic
Pb(3)
ND
ND
ND
ND
ND
ND
ND
Flash
Point
°F(4)
>180
Explanation
0)
(2)
(3)
(4)
(5)
*
•m
Fuel hydrocarbons by EPA Method 8015 (Modified)/DOHS Method
BTEX - benzene, toluene, ethylbenzene, total xylenes by EPA Method 8020
Organic lead by EPA Method 6010/DOHS equivalent method
Flash point in degrees Fahrenheit by EPA Method 1010
ND - Not detected at or above the laboratory detection limit
Units in mg/kg
Blank spaces indicated that compound was not analyzed for in the soil sample.
4901121-04
APPENDIX A
- REFERENCES
'* County of San Diego, Department of Health Services, Hazardous Material Management Division,
m Site Assessment and Mitigation Manual, Section III, January 1991.
** Leighton and Associates, 1991, Revised Investigation of Subsurface and Stockpiled Soil
Conditions at the Agua Hedionda Sewage Pump Station, Carlsbad, California,
** Project No. 4901121 -02, dated April 19.
A-1
APPENDIX B
/A\AnolyticalTechnologiesflnc.Corporate Offices: 555O Morehouse Drive San Diego, CA 92121 (619) 458-9141
ATI I.D.: 106012
June 11, 1991
*
LEIGHXON & ASSOCIATES
, 3934 MURPHY CYN RD., SUITE 205 B
• SAN DIEGO, CA 92123
<•) Project Name: AQUA HEDIONDA
— Project # : 4901121-003
Attention: LYNE PERRY*m
& Analytical Technologies, Inc. has received the following sample (s):
„, Date Received Quantity Matrix
4June 03, 1991 SOIL
«. The sample(s) were analyzed with EPA methodology or equivalent methods as specified in the
enclosed analytical schedule. The symbol for "less than" indicates a value below the reportable
*"* detection limit. Please see the attached sheet for the sample cross reference table.
*" The results of these analyses and the quality control data are enclosed.
PR
STEWART
CT MANAGER-FUELS
KENNETH WAHL
LABORATORY MANAGER
AAndy ticalTechnologies,! nc.
SAMPLE CROSS REFERENCE
Page 1
m Client : LEIOHTOM & ASSOCIATES Report Datet June 11, 1991
— Project # : 4901121-003 AXX I.O. : 106012
Project Name: AQUA HEDIONDA
m
_• AXI # Client Description Matrix Date Collected
„ 1 SSI e 2* SOIL 03-JUN-91
2 SS2 8 3' SOIL 03-JUN-91
«* 3 SS3 0 2* SOIL 03-JUN-91
4 SS4 0 2' SOIL 03-JUN-91
•Bft • ^^^^^^^^^^••^^^^^^^^^^•^^^^^^^^^^B._,MlM^—•—••••-—••-••«•-—•«B«««^KW_»M«BBB^««• ^_»_»^_B_HM__ ^ ••••••!••••••••!•••
** TOTALS
if SanplaK
4
ATI STANDARD DISPOSAL PRACTICE
The sample(s) from this project will be disposed of in twenty-one (21) days from the date of
this report. If an extended storage period is required, please contact our sample control
department before the scheduled disposal date.
^ AnalyticalTechnologies,lnc.
Client : LEIGHXON & ASSOCIATES
Project # : 4901121-003
Project Name: AQUA HBDIONDA
ANALYTICAL SCHEDULE
Page 2
ATI I.D.: 106012
Analysis Technique/Description
EPA 6010 (LEAD, ORGANIC)
EPA 8020 (AROMATIC VOLATILE ORGANICS)
MOD EPA 8015-CDOHS (FUEL HYDROCARBONS)
INDUCTIVELY COUPLED ARGON PLASMA
OC/ PHOTO IONIZATION DETECTOR
GC/ FLAME IONIZATION DETECTOR
AnalyticolTechnologies,lnc.
Client : LEIOHTOH & ASSOCIATES
Project # : 4901121-003
Project Name: AQUA HEDIONDA
METALS RESULTS
Page 3
ATI I.D.: 106012
Sample Client ID
#
Matrix Date
Sampled
Date
Received
1 SSI 9 2'
Parameter
ORGANIC LEAD
SOIL
Units 1
MG/KG <0.3
03-JUN-91 03-JUN-91
/fj^ AnalyticalTechnologies,lnc.
METALS - QUALITY CONTROL
DUP/MS
m Page 4
— Client: : LEIOHTON & ASSOCIATES
m Project # : 4901121-003 ATI I.D. : 106012
Project Name: AQUA HEDIONDA
41 Parameters REF I.D. Units Sample Dup RPD Spiked Spike %
Result Result Sample Cone Rec
m ORGANIC LEAD 106012-01 MG/KO <0.3 <0.3 0 9.0 10.4 87
m
% Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration
m RPD (Relative % Difference) = (Sample Result - Duplicate Result)*100/Average Result
AAnalyticalTechnologies,lnc.
METALS - QUALITY CONTROL
M
BLANK SPIKE
*• Page 5
„ Client : LEI6HTON & ASSOCIATES
Project f : 4901121-003 ATI I.D. : 106012
Project Name: AQUA HEOIONDA
4 —Parameter* Blank Units Blank Spiked Spike %
m Spike ID# Result Sample Cone. Rec
*• ORGANIC LEAD 13661 M6/K6 <0.3 12.4 10.4 119
m % Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration
RPD (Relative % Difference) = (Sample Result - Duplicate Result)*100/Average Result
AnalyticalTechnologies,lnc.
GAS CHROMATOGRAPHY RESULTS
Page 6
Test : EPA 8020 (AROMATIC VOLATILE ORGANICS)
Client : LEIGHTON & ASSOCIATES ATI I.D. : 106012
Project f : 4901121-003
Project Name: AQUA HEDIONDA
Sample Client ID Matrix Date Date Date Oil.
# Sampled Extracted Analyzed Factor
1 SSI e 2' SOIL 03-JUN-91 03-JUN-91 04-JUN-91 1.00
Parameter Units 1
BENZENE MG/KG <0.025
TOLUENE MG/KG <0.025
ETHYLBENZENE MG/KG <0.025
ZYLENES (TOTAL) MG/KG <0.050
SURROGATES
TRIFLUOROTOLUENE % 112
X\AnalyticalTeehnologies,lnc.
GAS CHROHATOGRAPHY - QUALITY CONTROL
REAGENT BLANK
m
M
11
m
I
*t
m
Test
Blank I.D.
Client
Project #
Project Name
Parameters
BENZENE
TOLUENE
ETHYLBENZENE
EPA 8020 (AROMATIC VOLATILE ORGANICS)
12460
LEIGHTON & ASSOCIATES
4901121-003
AQUA HEDIONDA
ZYLENES (TOTAL)
Units
MG/KG
MG/KG
MG/KG
MG/KG
ATI I.D. :
Date Extracted:
Date Analyzed :
Oil . Factor :
Page 7
106012
03-JUN-91
03-JUN-91
1.00
Results
<0
<0
<0
<0
.025
.025
.025
.050
SURROGATES
TRIFLUOROTOLUENE 110
<**
^J^ Anolyt calTechnologies,!nc.
m
GAS CHROMATOGRAPHY - QUALITY CONTROLM
MSMSD
*• Page 8
— Test EPA 8020 (AROMATIC VOLATILE ORGANICS) ATI I.D. : 106012
MSMSD # 15781 Date Extracted: 03-JUN-91
Client
^ Project t
Project Name
Parametersm
*• BENZENE
TOLUENE
** % Recovery *
— RPD (Relative
LEIGHTON & ASSOCIATES
4901121-003
AQUA HEDIONDA
Units
MG/KG
MG/KG
Date Analysed : 03-JUN-91
Sample Matrix : SOIL
REF I.D. t 105355-14
Sample
Result
<0.025
<0.025
Cone Spiked
Spike Sample
0.500 0.54
0.500 0.54
Rec
108
108
Dup
Spike
0.55
0.55
Dup
% Rec
110
110
(Spike Sample Result - Sample Result )*100/ Spike Concentration
% Difference) = (Spiked Sample Result - Duplicate Spike Result) *100/ Average
RPD
2
2
Result
AnalyticalTechnologies,lnc
Test :
Blank Spike #:
Client :
Project # :
Project Name :
OAS CHROMATOGRAPHY - QUALITY CONTROL
BLANK SPIKE
EPA 8020 (AROMATIC VOLATILE ORGAN! CS)
13439
LEIOHTON & ASSOCIATES
4901121-003
AQUA HEDIONDA
ATI I.D. :
Date Extracted:
Date Analyzed :
Sample Matrix :
Page 9
106012
03-JUN-91
03-JUN-91
SOIL
Parameters
m BENZENE
TOLUENE
Units
MG/KG
MG/KG
Blank
Result
<0.025
<0.025
Spiked
Sample
0.58
0.57
Spike
Cone.
0.500
0.500
Rec
116
114
% Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration
RPD (Relative % Difference) = (Spiked Sample - Blank Result)*100/Average Result
AnalyticalTechnologies,lnc.
GAS CHROMATOGRAPHY RESULTS
** Page 10
Test t MOD EPA 8015-CDOHS (FUEL HYDROCARBONS)
•* Client : LEIGHTON & ASSOCIATES ATI I.D. t 106012
— Project # : 4901121-003
Project Name: AQUA HEDIONDA
* Sample Client ID Matrix Date Date Date Dil.
jtf # Sampled Extracted Analyzed Factor
m 1 SSI 6 2* SOIL 03-JUN-91 03-JUN-91 06-JUN-91 1.00
2 SS2 8 3' SOIL 03-JUN-91 03-JUN-91 06-JUN-91 1.00
Parameter Units 1 2
. FUEL HYDROCARBONS MG/KG <5.0 <5.0
HYDROCARBON RANGE
HYDROCARBONS QUANTITATED USING
AnalyticalTechnologies,lnc
gg Test
Blank I.D.
Client
** Project #
4f Project Name
GAS CHROMATOGRAPHY - QUALITY CONTROL
REAGENT BLANK
MOD EPA 8015-CDOHS (FUEL HYDROCARBONS)
12515
LEIGHTON & ASSOCIATES
4901121-003
AQUA HEDIONDA
Page 11
ATI I.D. : 106012
Date Extracted: 03-JUN-91
Date Analyzed : 06-JUN-91
Oil. Factor : 1.00
Parameters
FUEL HYDROCARBONS
HYDROCARBON RANGE
HYDROCARBONS QUANTITATED USING
Units
NG/KG
Results
<5.0
<m
m
AnalyticalTechnologies,lnc.
GAS CHRONATOORAPHY - QUALITY CONTROL
Test
NSNSD #
Client
NSMSD
: MOD EPA 8015-CDOHS (FUEL HYDROCARBONS)
: 15901
: LEIGHTON & ASSOCIATES
tff Project # : 4901121-003
Project Name: AQUA HBDIONDA
Page 12
ATI I.D. : 106012
Date Extracted: 03-JUN-91
Date Analyzed : 06-JUN-91
Sample Matrix : SOIL
REF I.D. : 106012-01
Parameters Units Sample
Result
Cone
Spike
Spiked
Sample
%
Rec
Dup
Spike
Dup RPD
% Rec
*• FUEL HYDROCARBONS MG/KG <5.0 100 88 88 88 88
% Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration
RPD (Relative % Difference) = (Spiked Sample Result - Duplicate Spike Result)*100/Average Result
$± AnalyticalTechnologies,lnc.
GAS CHROMATOGRAPHY - QUALITY CONTROL
BLANK SPIKE
Test : MOD EPA 8015-CDOHS (FUEL HYDROCARBONS)
Blank Spike #: 13525
Client : LEIGHTON & ASSOCIATES
Project # J 4901121-003
Project Name : AQUA HEDIONDA
Page 13
ATI I.D. : 106012
Date Extracted: 03-JUN-91
Date Analyzed : 06-JUN-91
Sample Matrix : SOIL
Paraaeters
FUEL HYDROCARBONS
Units
MG/KG
Blank
Result
<S.O
Spiked
Sample
91
Spike
Cone.
100
%
Rec
91
% Recovery = (Spike Sample Result - Sample Result)*100/Spike Concentration
RPD (Relative % Difference) - (Spiked Sample - Blank Result)*100/Average Result
tilJtitJiitjtii
5550 MOREHOUSE DRIVE
^ AndyticalTechnologies, Inc.
t. j fc| ft
__ - -
Cfiaif) O/DATE.E_L OF_l_
Recommended Quantity and Preservative (Provide triple volume on QC Sample^.
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