PUBLIC HEALTH ASSESSMENT
CENEX SUPPLY AND MARKETING, INCORPORATED
(a/k/a WESTERN FARMERS, INCORPORATED)
QUINCY, GRANT COUNTY, WASHINGTON
Table A1: 1993 EPA & 1995 Cenex site
soil volatile organic compound (VOC) concentrations (in mg/kg)
Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sample | |||
Chemical | RPS1 EPA |
RPS2 EPA |
RPS3 EPA |
RPS4 EPA |
RPS5 EPA |
SS1* EPA |
SS2 EPA |
SS3 EPA |
SS4 EPA |
SS5 EPA |
1995 Cenex |
CV ![]() (child) |
CV (adult) |
Acetone | 0.059 | 0.04 | 0.042 | 0.07 | 5,000 RMEG |
70,000 RMEG |
|||||||
Benzene | 0.001 | 0.0003 | 20 - CREG | 20 - CREG | |||||||||
Chloroform | 0.002 | 100 - CREG 500 - EMEG |
100 - CREG 7,000 - EMEG |
||||||||||
1,2-Dichloropropane | 0.006 | 0.003 | 1 | 0.2 | 0.052 | 0.005 | 0.0004 | 1.5 | 5,000 - EMEG | 60,000 - EMEG | |||
1,2,4-Trimethylbenzene (pseudocumene) | 0.015 | 0.022 | 0.01 | 3,900 - EPA | 3,900 - EPA | ||||||||
1,3,5-TMB (mesitylene) | 0.006 | 0.036 | 0.009 | 3,900 - EPA | 3,900 - EPA | ||||||||
Chlorobenzene | 0.092 | 0.008 | 0.22 | 0.034 | 0.026 | 0.019 | 1,000 - RMEG | 10,000 - RMEG | |||||
1,3-Dichloropropane | 0.002 | 0.076 | 0.019 | 0.009 | N/A | N/A | |||||||
Total Xylenes | 0.068 | 0.002 | 0.152 | 0.045 | 0.003 | 10,000 - EMEG | 100,000 - EMEG | ||||||
cis-1,3-Dichloropropene | 0.005 | 0.009 | 20 - RMEG | 200 - RMEG | |||||||||
trans-1,3-Dichloropropene | 0.006 | 0.009 | 20 - RMEG | 200 - RMEG | |||||||||
Chloromethane | 0.002 | 0.002 | 0.002 | 76.9 - MTCA B | 76.9 - MTCA B | ||||||||
Naphthalene | 0.039 | 0.079 | 0.009 | 1,000 - EMEG | 10,000 - EMEG | ||||||||
2-Butanone (MEK) | 0.026 | 0.007 | 0.012 | 30,000 - RMEG | 400,000 - RMEG | ||||||||
Ethylbenzene | 0.009 | 0.002 | 5,000 - RMEG | 70,000 - RMEG | |||||||||
2-Chlorotoluene | 0.039 | 0.009 | 0.16 | 0.069 | 0.011 | 1,000 - RMEG | 10,000 - RMEG | ||||||
Tetrachloroethene (PERC) | 0.003 | 10 - CREG 500 - RMEG |
7,000 RMEG |
||||||||||
1,1,1-TCA | 0.008 | 0.001 | 1,600 - EPA | 1,600 - EPA | |||||||||
Chloroethane (ethyl chloride) | 0.001 | 220 - EPA | 220 - EPA | ||||||||||
1,1,2-TCA | 0.001 | 10 CREG 200 - RMEG |
10 - CREG 3,000 - RMEG |
||||||||||
Carbon disulfide | 0.008 | 0.028 | 5,000 - RMEG | 70,000 - RMEG | |||||||||
1,2,3-Trichloropropane | 0.002 | 300 - RMEG | 4,000 - RMEG | ||||||||||
1,1-Dichloroethene | 0.0002 | 1 - CREG 500 - EMEG |
1 - CREG 6,000 - EMEG |
* Background soil sample
CV = health comparison value
No soil VOCs exceeded health comparison values
EPA comparison values are from EPA Region III risk-based concentration (RBC)
Table
Table A2: 1993 EPA & 1995 Cenex site
herbicide/pesticide concentrations in soil/sludge (in mg/kg)
Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sample | Comparison value (child) |
Comparison value (adult) |
|
Chemical | RPS1* EPA |
RPS2 EPA |
RPS3 EPA |
RPS4 EPA |
RPS5 EPA |
SS1** EPA |
SS2+ EPA |
SS3 EPA |
SS4 EPA |
SS5 EPA |
1995 Cenex |
||
Disulfoton (insecticide) |
8.79 | 146 | 4.67 | 3.37 | 4.93 | 3 - EMEG | 40 - EMEG | ||||||
Diuron | 0.295 | 0.764 | 0.753 | 0.93 | 3.79 | 100 - RMEG | 1,000 - RMEG | ||||||
Cycloate | 0.79 | N/A | N/A | ||||||||||
Trifluralin (Treflan) (herbicide) |
158 | 57.7 | 295 | 349 | 0.98 | 294 | 138 | 400 - RMEG 90 - CREG |
5,000 - RMEG 90 - CREG |
||||
Atrazine | 5.25 | 0.694 | 21.3 | 38.6 | 0.735 | 8.51 | 4.55 - MTCA B | 4.55 - MTCA B | |||||
Vernolate (vernam) (herbicide) |
42.2 | 2.89 | 112 | 78.3 | 0.347 | 6.87 | 89.7 | 50 - RMEG | 700 - RMEG | ||||
Triallate (Fargo) | 2.67 | 1.57 | 7 | 8.65 | 3.21 | 1,040 - MTCA B | 1,040 - MTCA B | ||||||
Chlorpyrifos (insecticide) |
19.6 | 1.31 | 19.2 | 4.75 | 162 | 50 - EMEG | 700 - EMEG | ||||||
Tolban (profluralin) | 3.51 | 19.7 | 192 | 92 | 3.92 | 480 - MTCA B | 4,200 - MTCA B | ||||||
Pendimethalin (Prowl) | 14 | 8.68 | 20.5 | 24.8 | 9.12 | 2,000 - RMEG | 30,000 - RMEG | ||||||
Hexazinone (Velpar) | 1.16 | 1 | 1.77 | 2.14 | 5.33 | 0.674 | 2,640 - MTCA B | 2,640 - MTCA B | |||||
Ethalfluralin (Sonalan) (herbicide) |
373 | 120 | 1,530 | 917 | 557 | 478 | N/A | N/A | |||||
Eptam (EPTC) | 45.7 | 3.47 | 406 | 98.4 | 0.565 | 2.36 | 1,000 - RMEG | 20,000 - RMEG | |||||
Alachlor (Lasso) | 19.8 | 0.529 | 3.4 | 12.3 - MTCA B | 12.3 - MTCA B | ||||||||
Metolachlor | 33.9 | 8,000 - RMEG | 100,000 - RMEG | ||||||||||
Bromacil | 0.551 | N/A | N/A | ||||||||||
Terbacil | 1.86 | 1,040 - MTCA B | 1,040 - MTCA B |
* RPS = subsurface
soil/sludge samples
**background sample
+ SS2-SS5 = surface soil samples
Shaded cells = contaminant exceeds health comparison value and was further evaluated
in the health assessment
Table A3: Maximum Cenex site soil metal
concentrations (in mg/kg)
Chemical | 1995 - Cenex | 1993 - EPA (Sample # RPS4) |
Noncancer CV (Child) |
Noncancer CV (Adult) |
Cancer CV | 90th percentile Background (Yakima Basin) |
Beryllium | 0.979 | 1.39 | 100 - RMEG | 1,000 - RMEG | 0.233 (MTCA B) | 1.57 |
*Chromium | 181 | 360 | 200 - RMEG | 2,000 - RMEG | NA | 38.27 |
Cadmium | 8 | 25.2 | 10 - EMEG | 100 - EMEG | NA | 0.93 |
Zinc | 6,620 | 20,000 - EMEG | 200,000 - EMEG | NA | 78.71 | |
Thallium | 6.7 | 5.6 - MTCA B | 5.6 - MTCA B | NA | NA | |
Manganese | 397 | 7,000 - RMEG | 100,000 - EMEG | NA | 1,105 |
* assumes hexavalent chromium
Shaded cells = contaminant exceeds health comparison value and was further evaluated
in the health assessment
Table A4: 1993 EPA Cenex site soil phenoxyherbicide
concentrations34 (in mg/kg)
Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Sam # | Child CV | Adult CV | |
Chemical | RPS1 EPA |
RPS2 EPA |
RPS3 EPA |
RPS4 EPA |
RPS5 EPA |
SS1* EPA |
SS2 EPA |
SS3 EPA |
SS4 EPA |
SS5 EPA |
||
Dinoseb | 0.066 | 0.035 | 50 - RMEG | 700 - RMEG | ||||||||
MCPP + (Mecoprop) | 27 | N/A | N/A | |||||||||
MCPA ++ | 30 - RMEG | 400 - RMEG | ||||||||||
2,4-D | 3.7 | 8.5 | 27.5 | 20.3 | 14.1 | 0.065 | 1 | 0.45 | 500 - RMEG | 7,000 - RMEG | ||
2,4-DB | 0.48 | 0.5 | 4.6 | 0.48 | 1.52 | 0.87 | 0.49 | 0.69 | 400 - RMEG | 6,000 - RMEG | ||
Chloramben | 0.068 | 0.42 | N/A | N/A | ||||||||
Dacthal (DCPA) | 0.35 | 0.3 | 0.17 | 0.17 | 0.39 | 4.6 | 0.058 | 0.015 | 0.022 | 500 - RMEG | 7,000 - RMEG | |
Dicamba (Banvel) | 0.33 | 1 | 3.3 | 2.68 | 0.6 | 0.095 | 2,000 - RMEG | 20,000 - RMEG |
+ 2-(4Chloro-2-methylphenoxy) propanoic acid
++ (4-Chloro-2-methylphenoxy) acetic acid
* background sample
No phenoxyherbicides
exceeded health comparison values in soil
Table A5: Maximum VOC, nitrate, and ammonia
concentrations in the Cenex groundwater plume 35 (in µg/l)
Chemical | Maximum Concentration | Health Comparison Value | Maximum Contaminant Level (MCL) |
Bromodichloromethane | 2.4 | 0.6 - CREG | N/A |
Carbon Tetrachloride | 5.6 | 0.3 - CREG | 5 |
Chlorobenzene | 91 | 4,000 - Child EMEG | 100 |
Chloroform | 73 | 6 - CREG | 100 |
Chloromethane | 5.8 | 3 - LTHA | N/A |
1,2-Dibromoethane (EDB) | 23 | 0.0004 - CREG | 0.05 |
1,1-Dichloroethane | 19 | 800 - MTCA B | N/A |
1,2-Dichloroethane | 136 | 0.4 - CREG | 5 |
1,1-Dichloroethene | 18 | 0.06 - CREG | 7 |
1,2-Dichloropropane | 35,410 | 900 - EMEG | 5 |
1,3-Dichloropropane | 1,650 | N/A | N/A |
1,1-Dichloropropene | 3.1 | N/A | N/A |
1,3-Dichloropropene | 1.6 | ||
Methylene Chloride | 1.7 | 5 - CREG | 5 |
1,1,2-Trichloroethane | 154 | 0.6 - CREG | 5 |
1,2,3-Trichloropropane | 1,700 | 40 - LTHA | N/A |
Vinyl Chloride | 7.2 | 0.2 - EMEG | 2 |
Nitrate (mg/l) | 279 | 20 - RMEG | 10 |
Ammonia (mg/l) | 471 |
210 - EPA |
210 - EPA |
Shaded cells = contaminant exceeded a health comparison value
or drinking water standard
MCL =Safe Drinking Water Act maximum contaminant level
CREG = ATSDR cancer risk evaluation guide
EMEG = ATSDR environmental media evaluation guide
LTHA = long-term health advisory
RMEG = ATSDR reference dose media evaluation guide
MTCA B = Washington State Department of Ecology Model Toxics Control Act method
B clean-up level
Table A6: Cenex site soil VOC & metal
concentrations (in mg/kg), June 1997
Sample # | Sample # | Sample # | Sample # | Sample # | Sample # | Health Comparison Value | |
Chemical | BH1 | BH2 | BH3 | BH4 | BH5 | BH6 | |
Chlorobenzene | 4.8 | 1,000 - child RMEG 10,000 - adult RMEG |
|||||
1,2-Dichloropropane | 15, 2.1 | 1.2, 1.7 | 1.5, 3.7 | 0.66, 0.81, 1.1 | 5,000 - child EMEG 60,000 - adult EMEG |
||
1,3-Dichloropropane | 6.8, 1.1 | 0.28, 0.26 | 0.77 | N/A | |||
cis 1,3-Dichloropropene | 20 - child RMEG 200 - adult RMEG |
||||||
trans 1,3-Dichloropropene | 20 - child RMEG 200 - adult RMEG |
||||||
1,1,2-Trichloroethane | 0.21 | 200 - child RMEG 10 - CREG |
|||||
1,2,3-Trichloropropane | 0.69 | 0.2, 0.45 | 300 - child RMEG 4,000 - adult RMEG |
||||
+Beryllium | 0.3, 0.2 | 0.4, 0.1 | 0.1, 0.3 | 0.4, 0.2 | 0.2, 0.2 | 0.2, 0.2 | 100 - child RMEG 0.233 - MTCA B |
Cadmium | 0.25, 0.47 | 0.65 | 0.59, 0.24 | 0.49, 0.32 | 10 - child EMEG 100 - adult EMEG |
||
* Chromium | 10.1, 14.2 | 10.9, 9.3 | 9.2, 17.9 | 12.8, 14.6 | 9.1, 12.9 | 8.7, 11.7 | *200 - child RMEG |
* For hexavalent chromium
+ All beryllium samples were below the natural background concentration 3
Table A7: Cenex site soil pesticide/herbicide,
ammonia, and nitrate concentrations (in mg/kg)
June 1997 (after soil remediation)
Chemical | Sample # | Sample # | Sample # | Sample # | Sample # | Sample # | Sample # | Sample # | |
BH1 | BH2 | BH3 | BH4 | BH5 | BH6 | *BGS | **BGN | Health Comparison Value | |
Alachlor (Lasso) | 0.031, 0.026 | 0.023 | 0.014 | 500 - child RMEG 7,000 - adult RMEG |
|||||
Ethalfluralin | 0.363 | 0.005 | N/A | ||||||
Trifluralin | 0.003 | 0.01 | 0.298 | 0.001 | 0.001 | 90 - CREG 400 - child RMEG 5,000 - adult RMEG |
|||
Atrazine | 2,000 - child RMEG 20,000 - adult RMEG |
||||||||
Disulfoton | 3 - child EMEG 40 - adult EMEG |
||||||||
Vernolate | 0.295 | 50 - child RMEG 700 - adult RMEG |
|||||||
Nitrate-N | 40, 12 | 28.5, 6.4 | 35.5, 42.5 | 780, 200 | 24, 140 | 934, 242 | 16 | 8.5 | 80,000 - child RMEG 100,000 - adult RMEG |
Ammonia-N | 80, 21 | 480, 16 | 140, 1,100 | 320, 6.3 | 1,500, 1,500 | 3,500, 10 | 6.2 | 7.6 | 20,000 - child EMEG 200,000 - adult EMEG |
* Sample was collected from the south border of the Quincy
Junior High School athletic field
** Background soil sample was collected from the Habitat for Humanity property,
immediately northwest of the Cenex site
Table A8: Cenex site soil gas VOC concentrations
(in mg/m3)
Location | Date | chlorobenzene | chloroform | 1,1-DCE | 1,2-DCP | vinyl chloride | PID |
VP1 | 7/1/97 | N/D | N/D | N/D | N/D | N/D | N/D |
VP2 | 7/1/97 | N/D | N/D | N/D | 16 | N/D | 3 |
VP3 | 7/1/97 | N/D | 2.8 | N/D | 165 | N/D | 10 |
VP4 | 7/1/97 | N/D | 3.4 (![]() |
N/D | 791(![]() |
N/D | 30 |
VP5 | 7/1/97 | 4.3 (![]() |
3.1 | 3 (![]() |
3,010 (![]() |
3.7 (![]() |
88 |
VP6 | 7/1/97 | 3.4 | 2.6 | N/D | 197 (![]() |
N/D | 49 |
Table A9: Maximum modeled and measured
Cenex site ambient air VOC concentrations
Chemical | Modeled VOC Concentration (24 meters from stack) |
Cancer CV | Noncancer CV | Measured Concentration |
Chloroform | 0.00048 �g/m3 (=0.0024 ppb) | 0.04 �g/m3 (CREG) | 20 ppb (chronic EMEG) | ND |
Vinyl chloride | 0.00095 �g/m3 (=0.0024 ppb) | N/A | 30 ppb (Int. EMEG) | ND |
1,2-DCP | 0.1 �g/m3(=0.46 ppb) | N/A | 7 ppb (Int. EMEG) | ND |
Chlorobenzene | 0.00095(=0.0044 ppb) | N/A | 18 �g/m3 (EPA Region 3) | ND |
1,1-DCE | N/A | 0.02 �g/m3 (CREG) | 20 ppb (Int. EMEG) | ND |
ND = not detected
CV = health comparison value
Table A10: Quincy high school 3-M badge
air monitoring results
1,2-dichloropropane
(February 18-23, 1998)
Location | Concentration (µg/m3) | Method detection limit (µg/m3) | EPA RfC (µg/m3) | ATSDR EMEG (µg/m3) |
West side of school bldg. | < 4.6 | 4.6 | 4 | 32 (7 ppb) |
Boiler Room | < 4.6 | 4.6 | 4 | 32 |
Boiler Room Sump Basket | < 4.6 | 4.6 | 4 | 32 |
Kitchen | < 4.6 | 4.6 | 4 | 32 |
Main Office | < 4.6 | 4.6 | 4 | 32 |
Staff Lounge | 17 (3.7 ppb) | 4.6 | 4 | 32 |
Cafeteria | < 4.6 | 4.6 | 4 | 32 |
Band Room | < 4.6 | 4.6 | 4 | 32 |
Library | < 4.6 | 4.6 | 4 | 32 |
Science Room | < 4.6 | 4.6 | 4 | 32 |
Outside Dugout | < 4.6 | 4.6 | 4 | 32 |
Shaded cell = contaminant exceeded the EPA reference concentration (RfC)
Table A11: Cenex site child exposure dose
estimates and reference doses
Contaminant | Maximum Concentration (mg/kg) | Soil Ingestion Rate (mg/day) | Exposure Duration (years) | Estimated Exposure Dose (mg/kg/day) | EPA Reference Dose (mg/kg/day) |
Trifluralin | 349 | 50 | 10 | 0.0004 | 0.0075 |
Ethalfluralin | 1,530 | 50 | 10 | 0.002 | 0.0075 (used RfD for Trifluralin) |
Disulfoton | 146 | 50 | 10 | 0.0002 | 0.00004 |
Chlorpyrifos | 162 | 50 | 10 | 0.0002 | 0.003 |
Vernolate | 112 | 50 | 10 | 0.0001 | 0.001 |
Alachlor | 19.8 | 50 | 10 | 0.00003 | 0.01 |
Atrazine | 38.6 | 50 | 10 | 0.00005 | 0.035 |
Cadmium | 25.2 | 50 | 10 | 0.000017 | 0.001 |
Chromium | 360 | 50 | 10 | 0.0002 | 0.003 |
Thallium | 6.7 | 50 | 10 | 0.000005 | 0.00008 |
Beryllium | 1.39 | 50 | 10 | 0.00003 | 0.002 |
Shaded cell = Estimated dose above EPA reference dose
Table A12: Cenex site adult exposure dose
estimates and reference doses
Contaminant | Maximum Concentration (mg/kg) | Soil Ingestion Rate (mg/day) | Exposure Duration (years) | Estimated Exposure Dose (mg/kg/day) | EPA Reference Dose (mg/kg/day) |
Trifluralin | 349 | 50 | 23 | 0.0003 | 0.0075 |
Ethalfluralin | 1,530 | 50 | 23 | 0.001 | 0.0075 (used RfD for Trifluralin) |
Disulfoton | 146 | 50 | 23 | 0.0001 | 0.00004 |
Chlorpyrifos | 162 | 50 | 23 | 0.0001 | 0.003 |
Vernolate | 112 | 50 | 23 | 0.0001 | 0.001 |
Alachlor | 19.8 | 50 | 23 | 0.00002 | 0.01 |
Atrazine | 38.6 | 50 | 23 | 0.00003 | 0.035 |
Cadmium | 25.2 | 50 | 23 | 0.00001 | 0.001 |
Chromium | 360 | 50 | 23 | 0.0002 | 0.003 |
Thallium | 6.7 | 50 | 23 | 0.000003 | 0.00008 |
Beryllium | 1.39 | 50 | 23 | 0.0000007 | 0.002 |
Shaded cell = estimated dose above EPA reference dose
Table A13: Estimated child cancer and
noncancer risks
Contaminant | Maximum Concentration (mg/kg) | Ingestion Rate (mg/day) | Exposure Duration (years) | Hazard Quotient* (noncancer) | Estimated Increased Cancer Risk |
Trifluralin | 349 | 50 | 10 | 0.05 | 5 x 10-7 |
Ethalfluralin | 1,530 | 50 | 10 | 0.27 | 2 x 10-6 |
Disulfoton | 146 | 50 | 10 | 5 | N/A |
Chlorpyrifos | 162 | 50 | 10 | 0.07 | N/A |
Vernolate | 112 | 50 | 10 | 0.1 | N/A |
Atrazine | 38.6 | 50 | 10 | 0.001 | 2 x 10-6 |
Alachlor | 19.8 | 50 | 10 | 0.003 | 3 x 10-7 |
Beryllium | 1.39 | 50 | 10 | 0.015 | 6 x 10-7 |
Cadmium | 25.2 | 50 | 10 | 0.017 | N/A |
Chromium | 360 | 50 | 10 | 0.07 | N/A |
Thallium | 6.7 | 50 | 10 | 0.06 | NA |
Total (Hazard Index) ~ 5.6 | Total ~ 5 x 10-6 |
* = Hazard quotient
less than 1 indicates that noncancer health risks are unlikely to result from
exposure.
NA = Cancer slope factor not available.
Table A14: Estimated adult cancer and
noncancer risks
Contaminant | Maximum Concentration
(mg/kg) |
Ingestion Rate (mg/day) | Exposure Duration (years) | Hazard Quotient * (noncancer) | Estimated Increased Cancer Risk |
Trifluralin | 349 | 50 | 23 | 0.04 | 8 x 10-7 |
Ethalfluralin | 1,530 | 50 | 23 | 0.13 | 3 x 10-6 |
Disulfoton | 146 | 50 | 23 | 2.5 | N/A |
Chlorpyrifos | 162 | 50 | 23 | 0.03 | N/A |
Vernolate | 112 | 50 | 23 | 0.1 | N/A |
Atrazine | 38.6 | 50 | 23 | 0.0009 | 2 x 10-6 |
Alachlor | 19.8 | 50 | 23 | 0.002 | 4 x 10-7 |
Beryllium | 1.39 | 50 | 23 | 0.0006 | 1 x 10-6 |
Cadmium | 25.2 | 50 | 23 | 0.01 | N/A |
Chromium | 360 | 50 | 23 | 0.07 | N/A |
Thallium | 6.7 | 50 | 23 | 0.04 | NA |
Total (Hazard Index) ~ 2.9 | Total ~ 7 x 10-6 |
* = Hazard quotient
less than 1 indicates that noncancer health risks are unlikely to result from
exposure.
NA = Cancer slope factor not available.
Table A15: Modeled Cenex site dust inhalation
cancer and noncancer risks
Contaminant | Soil concentration (mg/kg) | Modeled air concentration | Estimated cancer risk (child) | Hazard Quotient (noncancer risk) (child) | Estimated cancer risk (adult) | Hazard Quotient (noncancer risk) (adult) |
atrazine | 38.6 | 5.86E-8 | NA | 5.5E-7 | NA | 3.4E-7 |
alachlor | 19.8 | 3E-8 | NA | 9.8E-7 | NA | 6.1E-07 |
chlorpyrifos | 162 | 2.5E-7 | NA | 2.7E-5 | NA | 1.7E-5 |
disulfoton | 146 | 2.2E-7 | NA | 1.8E-3 | NA | 1.1E-3 |
ethalfluralin | 1,530 | 2.3E-6 | 7.8E-10 | 1E-4 | 7.2E-10 | 6.3E-5 |
trifluralin | 349 | 5.3E-7 | 1.8E-10 | 2.3E-5 | 1.7E-10 | 1.4E-5 |
thallium | 6.7 | 1E-8 | NA | 4.2E-5 | NA | 2.6E-5 |
vernolate | 112 | 1.7E-7 | NA | 5.6E-5 | NA | 3.4E-5 |
cadmium | 25.2 | 3.8E-8 | 6.9E-11 | 1.3E-5 | 6.9E-11 | 7.7E-6 |
chromium | 360 | 5.5E-7 | 6.6E-9 | 6E-5 | 6.6E-9 | 3.7E-5 |
beryllium | 1.39 | 2.1E-9 | 5E-12 | 3.5E-7 | 5E-12 | 2.1E-7 |
Total (sum of cancer and noncancer risks) | 7.6E-9 | 2.1E-3 | 7.6E-9 | 1.3E-3 |
* = Hazard quotient
less than 1 indicates that noncancer health risks are unlikely to result from
exposure.
NA = Cancer slope factor not available
Figure 5. Locations where COCs exceeding Method B remain on site
Figure 6. Shallow Groundwater Flow Map
Figure 7. Hydrostratigraphic Cross Section along A-A'
Figure 8. Municipal Well Locations
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