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PUBLIC HEALTH ASSESSMENT

WELDON SPRING ORDNANCE WORKS
WELDON SPRING, ST. CHARLES COUNTY, MISSOURI



TABLES


Table 1 - WSTA Contaminant Pathway Evaluation

Table 2 - Surface Water Contaminants

Table 3 - Groundwater Well Usage at Twin Island Lake Resort

Table 4 - Past Test Results from Twin Island Lake Resort Wells



Table 1.

WSTA Contaminant Pathway Evaluation
PathwayContamination LocationExposure Receptor Population\Population SizeCurrent Path
GroundwaterWSTA, conservation areas (springs) and offsite wellsdrinking water, dermal contactconservation area visitors\unknownyes*
past private wells (Twin Island Lakes Resort)\noneno
SoilWSTA and conservation areas access restricted site workers and infrequent trespassers\unknown possible **
Biotapossibly on and offsiteconsumption of game and fishonsite trespassers, hunters and anglers offsite\unknownpossible ***

*    Incidental ingestion is not sufficient to result in adverse health effect
**    Contact with contaminated soil is restricted by institutional controls.
***    Adverse health effects unlikely due to low levels of contaminants in fish and infrequent consumption

Table 2.

Surface Water Contaminants
Water BodyContaminant(s)Concentrations
Lake 10 1,3,5 TNB 0.08 ppb
o-nitrotoluene0.06 ppb
Lake 23 1,3,5 TNB 0.11 ppb
m-nitrotoluene0.07 ppb
p-nitrotoluene0.06 ppb
Lake 32 o-nitrotoluene0.06 ppb
Lake 35 p-nitrotoluene0.07 ppb
1,3,5 TNB0.1 ppb
Lake 36 1,3,5 TNB0.08 ppb
Hampton Lake m-nitrotoluene0.27 ppb
o-nitrotoluene0.12 ppb

From:(1) Contaminant detections do not exceed CVs.
TNB CV = 0.5 ppb
No CV for m-, n-, o-, p-nitrotoluene, for comparison 2,4-DNT CV = 20.0 ppb, 2,4,6-TNT CV = 1.0 ppb

NOTE: Nitroaromatic contaminants not detected in former lagoons.

Table 3.

Former Groundwater Well Usage at Twin Island Lake Resort From:(4)
ID NumberDepthDescription and Use
#1111 Ft.Potable water to campsites. Connected to #61.
#2220 ftPotable water to sites. Not used "very often" water is rusty. Connected to #4.
#390 ft.Potable water to sites and resort office.
#4235 ft.Potable water to sites. Connected to #2.
#61?Potable water to owner's house and sites. Connected to #1.
Swim Lake Well630 ft.Water for swimming lake only.
Goldfish PondWell12 ft.Water to goldfish pond used only for children's catch and releasefishing.
Table 4: Past Test Results from Twin Island Lake Resort Wells Range of Concentrations (ppb) from Six Sample Runs (1989) From: (4)

Table 4.

Past Test Results from Twin Island Lake Resort Wells Range of Concentrations (ppb) from Six Sample Runs (1989) From: (4)
Well ID##1#3#4#61* *Owner's private wellGoldfish Pond
Chemicals
2,4,6-TNT0.2 - 0.320.03 - 0.6<0.03 - <0.250.04 - <0.250.03 - 0.04
*CV - 1.0/CREG C
2,4-DNT0.03 - 0.05<0.02 - 0.07 <0.02<0.02<0.02
CV - 20.0/EMEG child
2,6-DNT0.03 - 0.170.08 - 0.19<0.01<0.010.05 - 0.07
CV - 400.0/CLHA
1,3,5-TNB0.14 - 1.16 0.1 - 1.8<0.03<0.03 - 1.0<0.03
CV - 0.5/RMEG child
1,3-DNB<0.09<0.09 - 0.2<0.09<0.09<0.09
CV -1.0/LTHA and CREG D

* CV - ATSDR Comparison Value

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