DSHW-1990-001127 - 0901a0688013b3ba

Norman H. Bangerter
Governor
Suzanne Dandoy, M.D., M.P.H.
Expfutive nirector
Kenneth L. Alkema
Direrhir
w * ^1 2:1 p J)' \ '\:-ip
g DEPARTMENT OF HEALTH
p DIVISION OF ENVIRONMENTAL HEALTH
Bureau of Solid & Hazardous Waste
288 North 1460 West. P O. Box 16690
Salt Lake City, Ulati 84116-0690
[phone] DSHW TN
1990-20799
MEMORANDUM
TO: Hercules Bacclius Wor]cs File
FROiyi: Don Verbica
DATE: ]\Iay 31, 1990
SUBJECT: The location of ttie screen interval for monitoring well
70.
Participants: Don Verbica & Rick Page BSHW, Sliannon Storrud, Ricti
Anderson Hercules, Ricli Wliite, Lon Lamp and Tony Magliocchino
Earthfax.
A meeting was held on May 31, 1990 at 0930 to discuss the location
for the screen interval for monitoring well 70. Hercules drilled
this well to help define the extent of the uppermost aquifer as
well as to help determine the vertical extent of organic
contamination in the NIROP area. Attachment A of Hercules
submittal is a copy of the Bail test results. Attachment B is a
copy of the field chemistry summary. Attachment C is a copy of the
analytical results. These results indicate that volatile organic
contamination has migrated downward to a depth of approximately 315
feet. Attachment D show a graph of water yield with depth.
Attachment E showA a graph of water quality with depth. And
Attachment F is a copy of the Lithologic log.
Hercules consultants recommended that the screen interval be placed
at a depth of~295' to a depth of-'310'(15 feet of screen). Their
rationale was that this was the approximate depth of last
identified contamination and they wanted to verify that it was
there and not just brought down .with the drilling of the well.
Also, this zone had a good yield (-20 gpm) and was located in sands
and gravel which could allow for easier transport of the
contaminants. After discussing their proposal it was decided that
this would be a good location for the screen interval.
Hercules* consultants also indicated that the well extended irffothe
Salt LaJce group which they felt was in aquiclude.
Based on the information submitted, it appears that the Salt Lake
group is most likely an aquiclude, and that the screen interval
recommended is adequate.
It was explained to Hercules that additional work could be required
for the remain 20 feet of aquifer (below the screen interval)
depending on what type of remediation is required or based on
additional information if it indicated that the lower 20' is
contaminated.
DGV/cw
ATTACHMENT A
GW-70 BAIL TEST RESULTS
DEPTH
(feet)
155-164
168-173
175-180
185-190
191-193
196-200
200-205
207-210
218-220
227-230
237-241
245-250
260-265
266-270
270-275
279-285
290-295
296-300
301-305
309-313
315-317
317-320
326-330
326-335
1 333-350
DISHARGE
(gpm)
7
1.8
15
20+
20+
12
—
8
24
8
5
4
10
10
15
20+
20+
20+
20+
20+
12-15
15-20
20+
—
<0.5
STATIC WATER
WATER LEVEL
(feet)
152.25
152.25
152.93
153.10
153.10
151.85
153.20
152.36
152.02
151.91
151.65
151.48
148.08
—
147.41
147.51
—
147.99
—
—
147.53
—
148.19
148.16
—
LITHOLOGY
sandy gravel
sandy gravel
sandy gravel
sandy gravel
gravelly sand
sandy gravel
sand
sandy gravel
sand, some gravel
sandstone
sandstone
sandy gravel
sandy gravelly clay
sandy gravel
sand
sandy gravel
sandy gravel
sandy gravel
sand
sand
sand
sand
gravelly sand
gravelly sand
sandstone
~'^
ATTACHMENT B
GW-70 FIELD CHEMISTY SUMMARY
DATE
5-11-90
5-12-90
5-12-90
5-14-90
5-14-90
5-15-90
5-16-90
5-17-90
5-18-90
5-19-90
5-21-90
5-22-90
5-23-90
5-23-90
SAMPLE #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DEPTH
(feet)
164
168-173
175-180
191-193
196-200
207-210
227-230
245-250
260-265
280-285
296-300
315-317
326-335
333-350
pH
7.66
7.57
7.54
7.43
7.74
7.66
7.44
7.57
7.63
7.15
7.00
7.60
7.40
—
TEMP °C
19.8
13.8
14.3
13.2
15.7
14.3
13.2
15.3
13.5
13.2
13.0
14.0
13.7
—
CONDUCT
(umhos/
cm) 1
937
576
701
576
770
630
556
598
561
588
691
580
633
592
ATTACHMENT C
GW-70 ANALYTICAL RESULTS
DEPTH
(feet)
155-164
168-173
174-180
191-193
196-200
207-210
227-230
245-250
260-265
280-285
296-300
315-317
326-335
333-350
1,1-dichloroethene
(ug/1)
21
25
22
25
26
14
BDL
BDL
10
13
23
BDL
BDL
BDL
1,1,1-trichloroethane
(ug/1)
69
82
82
81
78
38
BDL
10
34
51
72
13
BDL
BDL
BDL = Below Detection Limit of 5 ug/1.
GW-70 YIELD WITH DEPTH
0.
160. 185. 210. 235. 260. 285. 310. 335. 360.
DEPTH (feet)
> o X 3 tfl
a
EarthFax
CL
Q_
O
H-,
tn
UJ o
o o
<• o
100.
90.
80.
70.
60.
50.
40.
30.
20.
10.
0.
GW-70 WATER QUALITY WITH DEPTH
TCA
DCE
•
TCA >
1-3 > o
S M Z
1^
td
160. 185. 210. 235. 260. 285. 310. 335. 360.
DEPTH (feet)
EarthFax
ATTACHMENT F
LITHOLOGIC LOG
GW-70
0'-200' : Sandy gravel. Some silt, trace clay with
occasional silt and clay stringers. Sand is
predominantly very fine to fine grained. Gravel is
subanguiar to angular. Occasional cobbles and
boulders. Clay layers (less than 1' thick) at 162'
and 173'. No odor, reacts to HCL. Brown to pale
brown to light yellowish brown (lOYR 5/3, 6/3,
6/4).
200'-205* : .Sand. Fine to medium grained. No odor, reacts to
HCL. Very slow drilling rate. Grayish brown (lOYR
5/2).
205'-225' : Sandy gravel. Some silt. Sand is very fine to
very coarse grained, grading to angular gravel.
Occasional clay stringers. No odor, very slight
reaction to HCL. Pale brown (lOYR 6/3).
225'-240' : Sandstone. Fine to medium grained. Soft, easily
broken with fingernail. Rapid drilling rate.
Occasional clay and gravel. Gravel layer 235'-
236'. Pale brown to dark yellowish brown to strong
brown (lOYR 4/2, 4/4; 7.SYR 4/6).
240'-245' : Clayey sandy gravel. Sand is fine to coarse
grained, grading to fine to coarse gravel. No
odor, slight reaction to HCL. Brown (7,SYR 5/4).
245'-250' : San4« Some clay. Sand is fine to medium grained.
Some coarse grained sand and fine gravel. Reddish
yellow (7.SYR 6/6).
250'-263' : Clay. Occasional sand and gravel layers;
occasional soft sandstone. _Clay is dense and dry
when broken. Light yellowish brown with streaks of
light gray (lOYR 6/4; 5Y 7/2).
263'~270' : Sandy qravel. Some clay. Sand is very fine to
very coarse grained, grading to gravel. Pale brown
(lOYR 6/3).
270'~275' : Sand. Fine to medium grained, some coarse grained.
Slow drilling rate. Pale brown (lOYR 6/3).
275'-300' : Sandy qravel. Occasional clay stringers
throughout. Sand is very fine to very coarse
grained, grading to gravel. Very pale brown (lOYR
7/3).
^' J""
ATTACHMENT F (cont)
LITHOLOGIC LOG
GW-70
300'-320' : Sand. Alternating layers of fine to medium grained
and fine to very coarse grained. Light brownish
gray (lOYR 6/2). Clay layer (less than 1') at
316': light gray (lOYR 7/2).
320'-335' : Gravelly sand. Sand is fine to very coarse
grained, grading to subanguiar gravel. Brown to
brownish yellow (lOYR 5/3, 6/6). Clay layer (less
than 1' thick) at 325': Yellowish red (SYR 5/8).
335'-3 60' : Sandstone. Very fine to coarse grained. Soft,
rapid drilling rate. No reaction to HCL. Brown
(lOYR 4/3).