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PUBLIC HEALTH ASSESSMENT

PEMACO MAYWOOD
MAYWOOD, LOS ANGELES COUNTY, CALIFORNIA


APPENDIX C: TABLES

Table 1. Chemicals Stored in Underground Storage Tanks at the Pemaco Site
Chemical Name (in storage tanks)
Methanol
Ethanol
Xylene
Propylene glycol
2-Ethoxy ethyl acetate
Isopropyl acetate
Isophorone
Ethyl acetate
Bending tank
1-Butanol
n-Butyl Acetate
MV&P Naphtha
Kerosine
Tolusol 6
Mineral sprits 350H
n-Hexane
Isopropanol
2-Butanone (Methyl ethyl ketone, MEK)
2-Butoxyethanol
Toluene
Acetone


Table 2. Identity and Quantity of Waste Chemicals in Drum Storage Area of the Pemaco Site
Waste in Drums Quantity (Gal) Haz Waste in Drums Quantity (Gal) Haz Waste in Drums Quantity (Gal) Haz
Acetone 382 Y Water insoluble 29   IPA 99% 37  
Ketone 125 Y Water soluble 52   Dxitol 34  
Toluene 59 Y Orange 66   Water and solvent 40  
Methanol 348 Y IPA; hexane; TCLG 24 Y Water junk 48  
Emuls 17   n-Butyl Alcohol; VMP; 53 Y n-propanal 40 Y
Methyl isobutyl ketone 16 Y Yellow 108   Alc. Oxitol; 360 15  
s-Butyl alcohol 37   LMILS; MS 55   Perc. MS; xylene 9 Y
n-Propyl acetate 165   Violert 55   Ethyl alcohol 38  
Isopropyl ac: NPAC 110   Light yellow 106   Xylene 25 Y
Water 85   VM&P 201 Y IPA LAC Dil MS 43  
Methyl Oxytol 12   n-Butyl/MS 12 Y Water with oil 52  
SOL 71 or 72 23   EMILs 39   Butyl alcohol 19 Y
Npalo 48   IMIL; MS 53   ARASOL 200/TRI 17 Y
Methyl oxitol 11   Xylene; ms 55 Y TC 53 8  
Ethyl alcohol; SBA 29   EMILs; SOL360 55   Mixed hexane 42 Y
Ethyl acetate85%-88% 55 Y Amyl acetate 51 Y Methyl ethyl ketone 57 Y
IPA, VMP 12 Y Xylenes; TOL 42 Y Junk 53  
Butyl ox: water 50   CS53; ms 18   Ethylene glycol 92 Y
Butyl acetate; 111TRI 52 Y TOL 18 Y Glycol butyl 12  
Methyl alcohol; IPA; MEK 205 Y NPALC; MS 55   EB Contam/water 12 Y
Iosesine 110 Y N. But. Ac 100 25 Y LAC fDIL 1360 60  

Taken from the June 1992 Hazardous Materials Business Plan
Haz = Is the chemical considered hazardous?


Table 3. Near-surface Soil Sampling Results from the Pemaco Site
  Concentration of Analytes (µg/kg)
  
Acetone		 Methyl Ethyl Ketone 1,1,1-Tri-chloroethane Trichloro- ethylene Methyl Iso-butyl Ketone
Ethylbenzene
Xylene		 Tetrachloro-ethylene
Adult EMEG (ug/kg) 1,000,000,000 NA NA NA NA 70,000,000 100,000,000 7,000,000
Child EMEG (ug/kg) 100,000,000 NA NA NA NA 5,000,000 10,000,000 500,000
CREG (µg/Kg) NA NA NA 60,000 NA NA NA 10,000
Sample Location  
NSB-103 400 <11 <11 <11 <11 <11 <11 <11
NSB-104 17 3J <11 <11 2J <11 <11 <11
NSB-105 79,000 12,000 <5,500 <5,500 2,700J 2,100J 15,000 210J
NSB-106 70Ja 5J <11 <11 1J <11 5J <11
NSB-107 180J 7J <13 <13 0.8J <13 19 <13
NSB-108 24 <11 <11 <11 <11 1J 6J <11
NSB-109 200 22 <13 <13 2J 0.8J 5J <13
NSB-110 130 5J <13 <13 <13 <13 <13 <13
NSB-111 30 5J <13 <13 <13 <13 <13 <13
NSB-112 19 <12 <12 <12 <12 <12 <12 <12
NSB-115 39 6J <12 <12 <12 <12 <12 <12
NSB-116 19 <11 <11 <11 <11 <11 <11 <11
NSB-117 17 <11 <11 <11 <11 <11 <11 <11
NSB-119 28 <11 <11 <11 <11 <11 <11 <11
NSB-120 12 <11 <11 28 <11 <11 <11 <11
NSB-121 20 2J <11 <11 <11 <11 <11 <11

NA = Value not available
J = Value did not meet all quality assurance criteria, and is a estimate only
a = The estimated value greatly exceeded the sample quantitation limit, so the analyte is presumed to be in sample
< = Not detected at the given sample quantitation limit


Table 4. Subsurface Soil Sampling from the Pemaco Site
  Depth (feet below ground surface) Acetone (ug/kg) 1,1-Dichloroethane (ug/kg) 1,2-Dichloroethylene (ug/kg) Trichloroethylene (ug/kg)
Adult EMEG (ug/kg)   1,000,000,000 NA 100,000,000 NA
Child EMEG (ug/kg)   100,000,000 NA 10,000,000 NA
CREG (µg/kg)   NA NA NA 60,000
Borehole          
MW-1 10 <20 <14 <14 <14
  20 <2,900 <1,700 <1,700 <1,700
  30 <980 <140 <140 <140
  50 <400 <140 <140 <140
  60 <1,800 <140 <140 <140
  70 <570 <130 <140 <140
  80 <2,000 <130 <140 <130
  85 <1,800 <130 <130 <130
  90 <14 <14 <14 <14
MW-2 10 <220 34J 160 <120
  20 2,300Ja <120 <120 <120
  30 660Ja <62 200 10J
  40 <46 <11 3J <11
  50 <76 <12 <12 <12
  60 <79 <12 <12 1J
  70 <1,500 <130 <130 16J
  75 130Ja <12 <12 80
  80 <79 <13 <13 120
  90 <870 <13 5J 80
SSB-1 10 <16 <12 <12 <12
  20 <380 <79 <79 <79
  25 <3,000 <1,800 <1,800 <1,800
  30 <5,000 <1,800 <1,800 <1,800
  40 <610 <150 61J <150
  50 <130 <12 <12 <12
  60 <320 <78 47J <78
  65 <160 <16 54 <16
  70 <1,500 <150 <150 <150
  80 <1,800 <160 <160 <160
  90 <820 <74 <74 <74
SSB-2 10 <72 <14 <14 <14
  20 <120 5J <14 <14
  30 <1,100 <150 <150 <150
  40 <680 37J <77 85
  50 <600 <130 <130 <130
  60 570Ja <30 <30 <30
  70 <600 <140 <140 <140
  80 <370 <30 <30 <30
  85 <91 <14 <14 <14
  90 <890 <140 <140 <140
SSB-3 15 <150,000 <150,000 30,000J 1,200,000
  20 <14,000 <14,000 1,900J 59,000J
  30 17,000 <1,400 <1,400 440J
  40 <35 <11 14 1J
  50        
  60 <46 <12 26 150
  70 700Ja <13 5J 200
  80 <460 <64 <64 70
  90 <250 <59 <59 <59
  95 190Ja <15 <15 <15
SSB-4 10 <76 <13 <13 <13
  20 <780 <74 <74 <74
  30 510Ja <29 18J 91
  40 <3,400 <2,000 <2,000 <2,000
  50 <140 <14 5J 64Ja
  60 <210 <15 <15 330
  70 <250 <70 <70 220
  80 <280 <77 <77 990Ja
  85 <140 <140 <140 560
  90 <360 <33 <33 <33

NA = Value not available; J = Value is an estimate because analysis did not meet all quality assurance criteria
a= The estimated value greatly exceeded the sample quantitation limit so the analyte is presumed to be present in the sample
b = The analytical holding time for this sample was exceeded, so the actual concentration is likely greater
Soil samples from boreholes MW-1 and MW-2 were labeled as SMW-1 and SMW-2 depth


Table 5. Characteristics of Wells in the Perched Groundwater at the Pemaco Site
Well Depth to Water
(below TOC)		 Depth of Well
(feet below ground surface)		 Clay Layer Depth
(feet below ground surface)
B-1 29.45 35 30
B-4 25.22 40 33
B-5 26.60 40 29
B-7 25.91 32 None
B-8 27.84 No log No log
B-10 26.20 35 25-30 and 35+
B-11 23.49 25 24+
B-12 22.58 25 None
B-14 21.37 33 30
B-15 No record 40 30


Table 6. Perched Groundwater Sampling
Analyte* Adult EMEG (ug/L) Child EMEG (ug/L) CREG
(µg/L)
B-1-P
B-4-P
B-5-P
B-7-P
B-8-P
B-10-P
B-11-P
B-12-P
B-14-P
B-15-P
Benzene NA NA 1 6J 39J 20 170 34 19 4J 10U 24Jb 32
Chloroethane NA NA NA 20U 20J 13 2J 9J 28 18 10U 61 58
1,1-Dichloroethane NA NA NA 60 55J 10U 5J 170 150Ja 13 10U 10U 3J
1,1-Dichloroethylene 300 90 0.06 36 50U 10U 10U 20U 10U 10U 10U 10U 10U
1,2-Dichloroethylene 7,000 2,000 NA 350 50U 3J 3J 20U 29 88 17 2J 1J
Ethylbenzene 4,00 1,000 NA 20U 250 110 170 270 48 7J 10U 2J 7J
Tetrachloroethylene 400 100 0.7 22 50U 10U 10U 20U 10U 10U 10U 10U 10U
Toluene 700 200 NA 200 12J 4J 2J 13J 47 7J 10U 10U 2J
1,1,1-Trichloroethane NA NA NA 90 50U 10U 10U 20U 10U 10U 10U 10U 10U
Trichloroethylene NA NA 3 9J 50U 8J 10U 20U 10U 10U 180 1J 6J
Vinyl Chloride 0.7 0.2 NA 44 50U 2J 39 290 4J 3J 10U 10U 10U
Xylene 7,000 2,000 NA 20U 720 130 240 6J 22 3J 10U 28Jb 22

* Concentrations presented in micrograms per liter or parts per billion (ppb)
NA = Value not available
Sample B-1-P was collected from Well B-1, B-4-P from B-4, etc.
U = Undetected at the sample quantitation limit
J = Value is an estimate because analysis did not meet all quality assurance criteria
a = The estimated value greatly exceeded the sample quantitation limit, so the analyte is assumed to be in the sample
b = Results are estimated due to missed holding time and inadequate sample preservation; actual concentration would be expected to be greater than the reported concentration


Table 7. Thermal Oxidizer Test Data
Chemical Test Run 1 Test Run 2 Test Run 3
Dibromochloropropane <6.44 X 10-4 <5.94 X 10-4 <5.29 X 10-4
Benzene <2.70 X 10-4 <3.59 X 10-4 <3.51 X 10-4
Carbon Tetrachloride <1.98 X 10-4 <1.82 X 10-4 <1.78 X 10-4
Chlorobenzene <2.70 X 10-4 <2.49 X 10-4 <2.44 X 10-4
Chloroform <2.53 X 10-4 <2.33 X 10-4 <2.28 X 10-4
Ethylenedibromide <1.62 X 10-4 <1.49 X 10-4 <2.11 X 10-4
Hydrochloric Acid 33.9 37.5 37.7
Methylene Chloride 6.15 X 10-4 1.19 X 10-3 8.09 X 10-4
Naphthalene <1.19 X 10-3 <1.09 X 10-3 <1.07 X 10-3
Styrene <2.92 X 10-4 <2.69 X 10-4 <2.63 X 10-4
Toluene 4.07 X 10-4 2.76 X 10-4 <2.98 X 10-4
Trichloroethylene <2.32 X 10-4 <2.14 X 10-4 <2.09 X 10-4
Vinyl chloride <4.87 X 10-4 <4.49 X 10-4 <4.39 X 10-4
Xylenes <2.87 X 10-4 <2.64 X 10-4 <2.58 X 10-4

Each run concentration is an average concentrations for four probes (ppm/v) (3)
< = detection limit value


Table 8. Health Interpretation of Estimated Concentrations in Thermal Oxidizer Stack Emissions
Comparison Values Calculated Annual Max Concentration (µg/m3) at Hazard Index (Adults) Increased Lifetime Cancer Risk
Chemical Unit Risk (µg/m3) -1 Ref. Conc (µg/m3) MEIa Heliotrope School MEIa Heliotrope School MEIa Heliotrope School
Dibromochloropropane 0.02 2 x 10-4 5.55 x 10-5 4.14 x 10-6 0.28 2.1 x 10-4 1.1 x 10-7 8.3 x 10-9
Benzene 2.9 x 10-5 12.8 1.11 x 10-5 8.28 x 10-7 8.7 x 10-4 6.5 x 10-8 3.2 x 10-10 2.4 x 10-11
Carbon Tetrachloride 4.2 x 10-5 315 1.11 x 10-5 8.28 x 10-7 3.5 x 10-8 2.6 x 10-9 4.7 x 10-10 3.5 x 10-11
Chlorobenzene NA NA 1.11 x 10-5 8.28 x 10-7        
Chloroform 2.3 x 10-5 97.7 1.11 x 10-5 8.28 x 10-7 1.1 x 10-7 8.5 x 10-9 2.6 x10-10 1.9 x 10-11
Ethylenedibromide 2.2 x 10-4 38.4 1.54 x 10-5 1.15 x 10-6 4.0 x 10-7 3.0 x 10-10 3.4 x 10-9 2.5 x 10-10
Hydrochloric Acid NA 20 5.33 x 10-1 3.98 x 10-2 2.7 x 10-2 2.0 x 10-8    
Methylene Chloride 1 x 10-6 104 3.89 x 10-5 2.90 x 10-6 3.7 x 10-7 2.8 x 10-1 3.9 x 10-11 2.9 x 10-12
Naphthalene NA 10.5 5.55 x 10-5 4.14 x 10-6 5.2 x 10-6 3.9 x 10-9    
Styrene NA 256 1.11 x 10-5 8.28 x 10-7 4.3 x 10-8 3.2 x 10-9    
Toluene NA 3,770 1.37 x 10-5 1.02 x 10-6 3.6 x 10-9 2.7 x 10-12    
Trichloroethylene 2 x 10-6 537 1.11 x 10-5 8.28 x 10-7 2.1 x 10-8 1.5 x 10-9 2.2 x 10-10 1.6 x 10-12
Vinyl Chloride 7.8 x 10-5 76.7 1.11 x 10-5 8.28 x 10-7 1.4 x 10-7 1.1 x 10-8 8.6 x 10-10 6.4 x 10-11
Xylenes NA 434 1.11 x 10-5 8.28 x 10-7 2.6 x 10-8 1.9 x 10-9    

 
Total 0.304 2.1 x 10-4 1.2 x 10-7 8.7 x 10-9

NA = Value not available
aMEI = Maximum Exposed Individual


Table 9. Completed Exposure Pathways for Pemaco Maywood Site
Pathway Name Source Medium Exposure Point Exposure Route Receptor Population Time of Exposure Exposure Activities
Adults exposed to contamination through inhalation of stack emissions from the thermal oxidizer Thermal oxidizer Air Homes located near Pemaco Site

Heliotrope School

Inhalation of emissions from thermal oxidizer Adult and child residents of neighborhood near Pemaco Site

Adult staff and students at Heliotrope school

Recent past (thermal oxidizer shut down) Daily activities at the home or school


Table 10. Potentially Completed Exposure Pathways for Pemaco Maywood Site
Pathway Name Source Medium Exposure Point Exposure Route Receptor Population Time of Exposure Exposure Activities
Residents exposed to contamination through inhalation of soil gas from contaminated shallow groundwater Contamination from leaking drums, leaking storage tanks reaching shallow groundwater and creating soil gas Soil gas Buildings near Pemaco Site over contaminated shallow groundwater Inhalation of soil gas that has migrated into buildings Adult and child residents Past

Present

Future

Daily activities
Residents exposed to contamination through inhalation of fugitive vapors from storage tanks and drums Leaking drums at facility
Leaking storage tanks at facility		 Air Buildings located near Pemaco facility

Heliotrope School

Inhalation of vapors from leaking drums, storage tanks Adult and child residents of neighborhood near Pemaco facility

Adult staff and children at Heliotrope school

Past (drums, storage tanks, no longer present) Daily activities at the home or school


Table 11. Eliminated Exposure Pathways for Pemaco Maywood Site
Pathway Name Source Medium Exposure Point Exposure Route Receptor Population Time of Exposure Exposure Activities
Residents exposed to contamination through incidental ingestion of contaminated surface soil Airborne contamination from Pemaco Site deposited onto the ground and emissions from the former incinerator Surface soil Yards of homes near Pemaco Site Incidental ingestion of contaminated soil Adult and child residents of homes near Pemaco Site Past

Present

Future

Recreational activities

Working in home garden

Residents exposed to contamination through ingestion of contaminated homegrown produce Airborne contamination from Pemaco Site deposited onto the ground and emissions from the former incinerator Home-grown produce, eggs, chickens Yards of homes near Pemaco Site Ingestion of contaminated produce, eggs, and chickens Adult and child residents of homes near Pemaco Site Past

Present

Future

Eating homegrown produce, eggs, chickens
Trespassers exposed to contamination through incidental ingestion of contaminated surface soil on site Contamination from leaking drums, storage tanks, that used to be on site Surface soil, concrete pad Pemaco Site Incidental ingestion and dermal contact with contaminated soil Adults and children trespassing onto Pemaco Site Past

Present

Future

Children's play activities
Residents exposed to contamination in ground water Contamination from drums storage tanks, reaching ground water Ground water Homes near Pemaco Site using municipal or private well water Ingestion and inhalation of contaminants from tap water Adult and child residents Past

Present

Future

Drinking water
Residents exposed to contamination from the site through exposure to contaminated surface runoff from the site Leaking drums at facility

Leaking storage tanks at facility

Surface runoff - storm drains flow to LA River Los Angeles River Los Angeles River channel Adult and child residents of neighborhood near Pemaco facility Past (drums, tanks, no longer on site, leaks can no longer drain to river channel Residents playing or engaging in other activities in the channel


APPENDIX D: PUBLIC COMMENTS

On March 21, 2001, copies of this PHA were sent to agencies, community groups, and community members. Approximately 5 weeks (March 21, 2001 to April 23, 2001) were allotted to the public to comment on this document. Copies of this document were placed in the Maywood Public Library for all interested parties to review. During the public comment period, CDHS received no written comments.

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