Document 6Bvx7JG4EDvx9wZQxvm8KwVDm
AR226-2629
17
AR226-262 9
Dordrecht Works C-8 Sam
Summary-Revision 1
Groundwater Sampling Results
Revision 1
Note:
Revision 1 of the Dordrecht Works March 2003 sampl
event summary was prepared based on new well const information received in June 2003. This new informat changed the observations presented on the "Second Aq
in this document.
iordrecht bampi 192003
The m
Scope of Work Summary
- 24 samples were collected on March 10-12., 20Q3,
including:
-18 site monitoring wells (most previously samp
mid 1990^). Two water bearing zones; freatic first aquifers. No samples were collected from ^second" aquifer.
-1 site tapwater (local ^city" water)
- 1 from "Spaarbekk" or "Drinkwaterbekken" r
- 2 from groundwater treatment system (combin influent and effluent)
- 2 from site wastewater treatment plant (sweetw
Dordrecht SamDiina
The
''Vv.^.y'''
Results (In ug/L)
^
wy
/
Sample ID MW-315 MW-N16-2 MW-N23-T
MW-N28-1 GW Treatment 103
|
Date
|
3/10/2003
3/10^2003
3/10/2003
3/10/2003 1
3/11/2003 :
Waste Treatment 82 GW Treatment 401
3/11/2003 3/11/2003
Waste Treatment 80
3/11/2003
Spaarbekk
3/11/2003 |
tap Water
MVV-119
MW-303 MW-05A
3/11/2003
3/11/2003 ; 3/11/2003 | 3/11/2003 T
MW-N26-1
3/11/2003
MW-N25-1 MW-308 MW-W02-A MW-314
'MW-TT8''"~'""'''~''1'''"" "
.^^^^.........^ ,,,........,,..,.,,..,..,,.....,
3/11/2003 3/11/2003 I 3/11/2003 i 3/11/2003 ; 3/1172003 3/1172003
MW-N19-1 MW-311 MW-316 MW-317
3/12/2003 3/1272063 371272003
3/12/2003
C-8(ug/L)
71.3 ^ ^
14.4 9-18 3,890 7.91 4,850 0.439 0.0736 158 7,430
^
16.1
3.99
131
14.7 50.2
^
^ ^ 0.762
354 1530 2896
The m
June Analytical ResulVMMI
June Sampling Result, MF-11= 295
* Well is situated near southern end of site near edge of "Drinkwaterbekken" reservoir.
: Sampling 2003
The m
|
SF
= che el i HA
- El Ue Ji 1s iS i ; = -
!
= g rror PPE
Fjrst Aquifer
OverallC-8 Con(ept|t
'^w
Results Discussion
9 Elevated levels found in Waste Treatment 82-Sweetwater (3 isg/L) and Waste Treatment 80-Saltwater (4850 ug/L).
- Based on flow of approximately 500,000 gal/day, this repr discharge of approximately 7,300 Ibs/year.
Highest groundwater measurement 7430 ug/L in MW-303,
completed in shallowest water bearing zone, "freatic layer" ("Ophooglaag"), Slightly higher than Aug. 1995 measurem
1700 ug/L. Other shallow wells near this site location MW-3 (1530 ug/L) and MW-317 (2890 ug/L).
Range for shallow water bearing zone is 34.9 ug/L (central 7430 ug/L, north site, near river.
Dordrecht Sampling 2003
'i'^-."-::" The m
Results Discussion
Concentrations in first aquifer "Eerste" range from .139 to ug/L.
Overall, 2003 measured concentrations are higher than mid sampling events.
Spaarbekk Reservior .439 ug/L. Water used by site for non cooling. Also used for water sports/recreation.
Groundwater treatment system influent, GW Treatment 10 9.18 ug/L and effluent, GW Treatment 401, was 7.91 ug/L.
Site "Tap Water" was .0736 ug/L. Source is "city water".
303
UN The
Site Conceptual Model Summary
Areas of impact and groundwater flow directi
Dordrecht sampling 2003 ^
'
-
The
^ey
Site Conceptual Model
Primary source area (I.e., C8 and chlorocarbons) is freatic (s aquifer underlying FP process area. This area of impact is co by a sheet-pile cut-off wall and a Groundwater Pump & Trea Treatment is air stripper (no affect on C-8).
First aquifer is also pumped to maintain inward groundwate gradient. Second aquifer receives "Pumped Infiltration" to establish h pressures (upward gradient) and prevent first aquifer from fl vertically downward to second.
cht Sampling 2003 ^
:,
-
: ^; L "^n. The m
LL /
@
\ itl [Ld
Ly .
i
2 ERE = eeJ)
:
~ b=25
J
5]
z
a<
4
5
[<]
8)
H K2Y
S Lr
. ia
|||
OB |
E Tae
3
3 Fo |oh
dL]
i TE
A
AiIFae NNaFT
0
ba Guts
:
cha
BN|
ll
hi A|
ot Y ae ARE)Y
y
= | =2h OERA LF
lL
= =e]
;
ol;
[Q)o IS 1ru} a
hy
[37)
J
-- ut
aa) --
=| & messWR 1)Dg
ee