Record of Decision Remedial Alternative Selection SITE: Varsol Spill Site, Dade County, Florida DOCUMENTS REVIEWED I am basing my decision on the following documents describing the analysis of cost-effectiveness of remedial alternatives for the Varsol Spill Site: Evaluation of the Clean-Up Activities Already Undertaken at the Miami Drum Services Hazardous Waste Site, Dade County, Florida, September 1, 1982 - Phase I—Compilation and Evaluation of Data for the Protection of the Biscayne Aquifer and Environment in North Dade County, Florida, October 15, 1982 Remedial Investigation for Miami Drum Services Site, Florida, Florida Department of Environmental Regulation, Tallahassee, Florida 32301, November 1983 - Phase II—Sampling, Analytical, and Investigative Program for the Protection of the Biscayne Aquifer and Environment in North Dade County, Florida, February 1984 Phase III Feasibility of Remedial Actions for the Protection of the Biscayne Aquifer in Dade County, Florida, November 1984 - Record of Decision Summary of Remedial Alternative Selection, Biscayne Aquifer Sites, Dade County, Florida Background Phase I: Varsol Spill Site Responsiveness Summary DESCRIPTION OF SELECTED REMEDY In view of the fact that no trace of the varsol was found at this time in and around the airport, the recommended alternative for this site is no action. 10802037
Transcript
Record of Decision Remedial Alternative Selection
SITE: Varsol Spill Site, Dade County, Florida
DOCUMENTS REVIEWED
I am basing my decision on the following documents describing the analysis of cost-effectiveness of remedial alternatives for the Varsol Spill Site:
Evaluation of the Clean-Up Activities Already Undertaken at the Miami Drum Services Hazardous Waste Site, Dade County, Florida, September 1, 1982
- Phase I—Compilation and Evaluation of Data for the Protection of the Biscayne Aquifer and Environment in North Dade County, Florida, October 15, 1982
Remedial Investigation for Miami Drum Services Site, Florida, Florida Department of Environmental Regulation, Tallahassee, Florida 32301, November 1983
- Phase II—Sampling, Analytical, and Investigative Program for the Protection of the Biscayne Aquifer and Environment in North Dade County, Florida, February 1984
Phase III Feasibility of Remedial Actions for the Protection of the Biscayne Aquifer in Dade County, Florida, November 1984
- Record of Decision Summary of Remedial Alternative Selection, Biscayne Aquifer Sites, Dade County, Florida
Background Phase I: Varsol Spill Site
Responsiveness Summary
DESCRIPTION OF SELECTED REMEDY
In view of the fact that no trace of the varsol was found at this time in and around the airport, the recommended alternative for this site is no action.
10802037
Although large concentrations of spilled jet-A fuel were found in the groundwater near Concourse E of the airport, CERCLA (Superfund) does not address jet fuel spills. However, recovery of the fuel should continue and the contaminated groundwater there should be be treated in accordance with Dade County regulations.
FUTURE ACTIONS
While no varsol was found in and around the airport, the spill did occur. Several factors could contribute to the fact that no varsol is detectable at this time; some of the solvent was recovered. Biodegradation is believed to have destroyed some more, but the hydrology of the aquifer system strongly suggests that some of the solvent contributed to and became a part of the "background" contamination in the aquifer. This "background" contamination will be addressed in a separate Record of Decision (Phase V) as part of the remedy for the three sites referred to as the Biscayne Aquifer Superfund Sites.
DECLARATIONS
Consistent with the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), and the National Contingency Plan (40 CFR Part 300), I have determined that the no action alternative is a cost effective remedy and provides adequate protection of public health, welfare and the environment. The State of Florida has been consulted and agrees with the approved remedy.
I have also determined that the action being taken is appropriate when balanced against the availability of Trust Fund monies for use at other sites.
larles R. Jeter ' Charles R. Regional Administrator
cc: J. Silva, WD J. Finger, ESD H. Zeller, OPM
RECORD OF DECISION SUMMARY OF REMEDIAL ALTERNATIVE SELECTION
BISCAYNE AQUIFER SITES, DADE COUNTY, FLORIDA
PHASE I: VARSOL SPILL SITE
ALTERNATIVES EVALUATION
During the Remedial Investigation (RI), wells along NW 36th Street were sampled for all priority pollutants. The varsol spill was the result of underground pipeline leak(s) near 36th Street in the northeast corner of the Miami International Airport. In addition, newly constructed wells and existing wells, including some municipal production wells were sampled in the area north of the airport because the migration of the varsol towar(d the Lower Miami Springs wellfield was of concern. The location of the wells sampled and the geographical areas defined for data evaluation are shown in Figure 4. Oil and grease samples were also collected at most of the above wells as an indicator of any varsol remaining on the water table or in the soil at these locations.
A suminary of the results for the airport area and the Lower Miami Springs area are shown in Tables 1 and 2, respectively. The analytical results for the airport area are comparable to those in the other geographical areas. Table 3 lists the mean values of vinyl chloride, t'rans-1,2-dichloroethene (the two VOCs most commonly detected), as well as the total concentrations of all priority pollutant VOCs detected. This table indicates that the airport area water is of similar quality as that all over the remaining study area. This- can also be seen from Figure 5, which shows positive VOC results all over the study area. Table 4 lists in decreasing order the mean concentration of vinyl chloride detected in each well in the study area. Wells with mean concentrations of vinyl chloride below 1.0 yg/L are not listed. Table 5 presents similar information for total volatile organics (priority pollutants). Tables 4 and 5 also confirm the conclusion that water quality at this site is similar to that all over the study area.
No oil and grease were detected in the wells along 36th Street. In the Lower Miami Springs area, oil and grease were found at the minimum detection limit of 5 mg/L in two wells, A-3 and A-4, but only once out of the five times they were sampled. These results do not show any evidence of any varsol remaining in the soil or water at this time.
gnR290/03 -1-
The wells along 36th Street and immediately north of it in the Lower Miami Springs area were sampled again in October 1983 (in addition to the six samples collected in November 1982 and March 1983) . The results of this additional sampling agree with the earlier findings summarized above.
These results show that the varsol spilled during the late 1960's at the airport is not present at this time at this location. Also, there is no evidence of its migration toward the Miami Springs municipal well field. The hydrocarbon layer thickness was non-existent during the late 1970's, according to Eastern Airlines studies, and the 1982 and 1983 RI also confirms this conclusion. These findings give further impetus to the following statement in the report of our initial evaluation (October 1982) : "A study of this problem has indicated that some microbial decomposition of the underground hydrocarbons is being accomplished by bacteria present in the soils." These results call for no action at this site.
RECOMMENDED ALTERNATIVE
In view of the fact that no trace of the varsol was found at this time in and around the airport, the recommended alternative for this site is no action.
Although large concentrations of spilled jet-A fuel were found in the groundwater near Concourse E of the airport, CERCLA (Superfund) does not address jet fuel spills. However, recovery of the fuel should continue and the contaminated groundwater there should be treated in accordance with Dade County regulations.
FUTURE ACTIONS
While no varsol was found in and around the airport, the spill did occur. Several factors could contribute to the fact that no varsol is detectable at this time. Some of the solvent was recovered and biodegradation is believed to have destroyed some more; however, the hydrology of the aquifer system strongly suggests that some of the solvent contributed to and became a part of the "background" contamination in the aquifer, as shown in attached Tables and Figures. This "background" contamination will be addressed in a separate Record of Decision (Phase IV) as part of the remedy for the three sites referred to as the Biscayne Aquifer Superfund Sites.
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ARSENIC
CADMIUM
CHROMIUM
LEAD
MERCURY
SELENIUM
ZINC
CHLOROBENZENE
CHLOROETHANE
1,1-DICHLOROETHANE
TRANS-1,2-DICHLOROETHENE
1,1,2.2-TETRACHLOROETHANE
TOLUENE
1,1.1-TRICHLOROETHANE
TRICHLOROETHENE
VINYL CHLORIDE
TOTAL RECOVERABLE PHENOLS
ACETONE
DIMETHYL SULFIDE
METHYL BUTYL KETONE
METHYL ETHYL KETONE
METHYL ISOBUTYL KETONE
STYRENE
UNIDENTIFIED COMPOUNDS (EXTRACTABLE)
.L DESIGNATION
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LEGEND
A Detected in at least one sample, no criteria g iven. '
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• Detected in at least one sample ContaiTiinants Detected in the Airport .„ . . ^''!r,«l!^''°'^S'!'^!^. . ,, . „, Monitorina Wells Alona 36th St. uruer a in i-ii i-iepon (i-eo. nao4, i aoie 4-ii) __ _ ^__ _ ^^ ^ ^ H ^ _ _ ^ __
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CADMIUM
CHROMIUM
COPPER
LEAD
MERCURY
SELENIUM
ZINC
BENZENE
CHLOROBENZENE
CHLOROETHANE
CHLOROMETHANE
1,1-DICHLOROETHANE
TRANS-1,2-DICHLOROETHENE
ETHYL BENZENE
METHYLENE CHLORIDE
1,1,2,2-TETRACHLOROETHANE
TETRACHLOROETHENE
TOLUENE
VINYL CHLORIDE
TOTAL RECOVERABLE PHENOLS
OIL & GREASE
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C8 ALKYLPHENOL
DIMETHYLHEPTANE
METHYL BUTYL KETONE
METHYL SULFIDE
STYRENE
M-XYLENE
O&P-XYLENE
UNIDENTIFIED COMPOUNDS (EXTRACTABLE)
\ . DESIGNATION 1
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Table 3 MEAN VALUES OF SELECT ANALYTICAL PARAMETERS
FOR VARIOUS GEOGRAPHICAL AREAS
Geographical Area
Airport Monitoring Wells
Lower Miami Springs Wells
Upper Miami Springs Wells
Hialeah Area Wells
58th Street Landfill Wells
Unsewereci Industrial Area Wells
Total VOCs
10
20
33
57
6,2
1.0
vinyl Chloride
3.5
8,7
17
23
0.31
0.25
Trans--1 2-dichloroethene
1,1
3,6
7,3
28
0,53
0.25
Notes: 1. All values reported in yg/L,
2. There are fewer monitoring wells in the Unsewered Industrial Area than in other areas. Results of analyses from these wells might not be indicative of the water quality of the whole area.
gnR290/04/l _5-
Table 4 MEAN CONCENTRATION OF VINYL CHLORIDE
DETECTED AT INDIVIDUAL SAMPLING STATIONS
Well No.
C-1B(51)
C-lC(lOl)
G-1280(54)
F-414(65)
F-255(82)
MS-9(105)
MS-8(64)
P-5 (85)
MW-6D(55)
MW-11D(55)
P-3(85)
LM-10(30)
MS-3(62)
P-2(85)
MS-19(106)
MS-20(106)
TP-MSR
MS-2(96)
TP-PR
F-239(53)
LM-10(60)
MS-12(B5)
MW-5D(56)
TP-MSF
M-3(132)
TP-PF
MS-23(97)
P-7(85)
P-4(85)
MW-4D(71)
Location
Upper Miami Springs Area
Upper Micuni Springs Area
Hialeah Area
Lower Miami Springs Area
Hialeah Area
Upper Miami Springs Area
Lower Miami Springs Area
Hialeah Area
Airport Monitoring Wells
Airport Monitoring Wells
Hialeah Area
Upper Miami Springs Area
Lower Miami Springs Area
Hialeah Area
Upper Miami Springs Area
Upper Miami Springs Area
Hialeah Water Treatment Plant—Raw
Lower Miami Springs Area
Preston Water Treatment Plant—Raw
Hialeah Area
Upper Miami Springs Area
Hialeah Area
Airport Monitoring Wells
Hialeah Water Treatment Plant—Finished
Upper Miami Springs Area
Preston Water Treatment Plant—Finished
Upper Miami Springs Area
Hialeah Area
Hialeah Area
Airport Monitoring Wells
Mean Concentration (ug/L)
142
111
100
68
59
51
37
32
24
23
19
17
16
12
10
10
9.8
9.5
9.3
8.9
8,0
6.5
6.2
6.1
5,5
5.3
5,2
5,1
4,6
3.5
gnR290/04/2 -6-
Table 4 (continued)
Location Well No,
MS-1(67) Lower Miami Springs Area
A-1C(86) Lower Miami Springs Area
MW-7D(53) Airport Monitoring Wells
P-l(85) Hialeah Area
A-3C(88) Lower Miami Springs Area
MW-3S(12) Airport Monitoring Wells
A-4B(50) Lower Miami Springs Area
A-3B(51) Lower Miami Springs Area
LM-9(30) 58th Street Landfill Area
M-l(132) Upper Miami Springs Area
MW-5S(11) Airport Monitoring Wells
M-2 (131) Upper Miami Springs Area
Mean Concentration (yg/L)
3.5
3.3
2.9
2.1
1.8
1.6
1.6
1.6
1.3
1.3
1.2
1.0
Note: All other stations have mean concentrations less than 1.0 yg/L,
gnR290/04/3 -7-
Table 5 MEAN CONCENTRATION OF TOTAL VOLATILE ORGANICS
(PRIORITY POLLUTANTS) DETECTED AT INDIVIDUAL SAMPLING STATIONS
Well No.
C-1B(51)
C-lC(lOl)
G-1280(54)
F-414(65)
MS-20(106)
F-255(82)
F-239(53)
MS-9(105)
P-5(85)
MS-8(64)
MW-3S(12)
TP-MSF
MW-6S(11)
LM-10(30)
P-2(85)
P-7(85)
P-3(85)
TP-PR
TP-MSR
MS-19(106)
MS-3(62)
TP-PF
LM-10(60)
MW-lS(ll)
M-2(131)
MW-9D(42)
MS-22(92)
MS-2(96)
A-3B(51)
MS-12(85)
Location
Upper Miami Springs Area
Upper Miami Springs Area
Hialeah Area
Lower Miami Springs Area
Upper Miami Springs Area
Hialeah Area
Hialeah Area
Upper Miami Springs Area
Hialeah Area
Lower Miami Springs Area
Airport Monitoring Wells
Hialeah Water Treatment Plant—Finished
Airport Monitoring Wells
Upper Miami Springs Area
Hialeah Area
Hialeah Area
Hialeah Area
Preston Water Treatment Plant—Raw
Hialeah Water Treatment Plant—Raw
Upper Miami Springs Area
Lower Miami Springs Area
Preston Water Treatment Plant—Finished
Upper Miami Springs Area
Airport Monitoring Wells
Upper Miami Springs Area
Airport Monitoring Wells
Upper Miami Springs Area
Lower Miami Springs Area
Lower Miami Springs Area
Hialeah Area
Mean Concentration (yg/L)
166
151
145
137
119
108
102
101
80
76
56
54
46
43
38
37
36
35
27
26
26
26
25
25
25
20
20
19
18
16
gnR290/04/4 -8-
Table 5 (continued)
Location Well No.
A-4C(90) Lower Miami Springs Area
P-l(85) Hialeah Area
LM-4A(20) 58th Street Landfill Area
MS-23(97) Upper Miami Springs Area
MW-2D(47) Airport Monitoring Wells
LM-5A(10) 58th Street Landfill Area
B-5A(18) Unsewered Industrial Area
P-4(85) Hialeah Area
MW-2S(11) Airport Monitoring Wells
MW-15D(55) Other Sampling Stations
M-l(132) Upper Miami Springs Area
LM-4A(40) 58th Street Landfill Area
LM-9(10) 58th Street Landfill Area
A-4A(18) Lower Miami Springs Area
LM-4A(64) 58th Street Landfill
LM-9(30) 58th Street Landfill
LM-5A(30) 58th Street Landfill
M-6(131) Upper Miami Springs Area
F-441(57) Lower Miami Springs Area
LM-8(30) 58th Street Landfill Area
A-l(C)(86) Lower Miami Springs Area
LM-8(60) 58th Street Landfill Area
G-1368(38) Hialeah Area
MW-4S(12) Airport Monitoring Wells
LM-6A(60) 58th Street Landfill Area
LM-5A(60) 58th Street Landfill Area
M-3(132) Upper Miami Springs Area
LM-8(10) 58th Street Landfill Area
LM-6A(10) 58th Street Landfill Area
MS-1(67) Lower Miami Springs Area
M-4(129) Upper Miami Springs Area
Mean Concentration (yg/L)
16
15
14
13
13
13
12
12
12
12
11
11
10
10
10
9.0
8.8
8.2
8,1
7,6
7,3
7.2
7,0
6,1
5,7
5,7
4.8
4,3
3,7
3,5
3,5
gnR290/04/5 -9-
Table 5 (continued)
Mean Concentration Well No. Location , (yg/L)
LM-7A(60) Upper Miami Springs Area 3.0
LM-6A(30) 58th Street Landfill 3.0
A-4A(18) Lower Miami Springs Area 2.7
MW-8S(11) Airport Monitoring Wells 2,5
MS-17(106) Upper Miami Springs Area 2.2
MW-11D(55) Airport Monitoring Wells 2,2
A-4B(50) Lower Miami Springs Area 2.0
LM-1(10) Other Sampling Stations 1,9
B-4B(51) Unsewered Industrial Area 1.5
LM-IO(IO) Upper Miami Springs Area 1,5
MW-1D(53) Airport Monitoring Wells 1,0
MW-4D(71) Airport Monitoring Wells 1.0
MS-16(106) Upper Miami Springs Area 1.0
Note: All other stations have mean concentrations less than 1.0yg/L.
A Detected in at least one sample, no criteria given.
o Detected in at least one sample, but at levels less than established criteria.
• Detected in at least one sample, at levels above criteria.
NOTE: The criteria listed In Table 4-2 are for data classification purposes only, and are not intended to t>e used as a standard unless the criteria Is a published standard. (See Rl Report, Feb. 1984))
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