Flushing Study and Sampling Survey
Numford Cove
Groton, Connecticut
June 9 — 12, 1980
United States
Environmental
Protection Agency
Region I
0 Si; 47
L PRO1
JOHN F. KENNEDY FEDERAL BUILDING
GOVERNMENT CENTER
- BOSTON, MASSACHUSETTS 02203

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 Flushing Study and Sampling Survey

            Mumford Cove

         Groton, Connecticut

          June 9-12, 1980
U.S. Environmental Protection Agency
              Region I
  Surveillance & Analysis Division
         60 Westview Street
         Lexington, MA  02173

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Table of Contents
Flushing Study and Sampling Survey
14 miford Cove, Cr0 ton, Connecticut
Title Page
The Study 1
Sampling Pattern 2
Station Descriptions 3
Tide Times 4
Field Data 5 - 6
Chemical Data 7 - 9
I4icrobiologica]. data 10 - 11
Flow Data - Fort Hill Brook 12
Dye Concentration Curves 13 - 23
Center of Mass Curves 24 - 34
1.

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The Study
At the request of the U.S.E.P.A. Region I ’s Construction Grants Branch,
a flushing study and sampling survey were performed by the Surveillance and
Analysis Division June 9 -12, 1980. The purpose of this project was to
collect data to be used in determining the time required for a contaminant
introduced in Fort Hill Brook to pass through Mumford Cove and exit in Long
Island Sound.
The project entailed a dye dump at 1320 on ! bnday, June 9, 1980, during
low tide at the outfall of the Groton Town Was tewater Treatment Plant. The
dye was monitored in Mumford Cove during all high and low tides beginning at
1900 on June 9 and ending at 1624 on June 12, 1980. The low tide run at 0207
on June 10, 1980 was aborted due to inclement weather.
Fluorometric data was tabulated and graphed using actual concentration
values and calculated center of mass values.
It was desireable to collect background data from Fort Hill Brook, Long
Island Sound and the Thames River as well as Muinford Cove. Samples were
collected from twelve locations both by boat and from shore according to a
pra-determined schedule from June 10 to June 12, 1980. The sample run of 0942
on June 12 was aborted due to mechanical failure.
Collected samples were analyzed at NERL and in the field for the following
parameters: temperature, pH, salinity, conductivity, chlorophyll a, pheophytin
a, BOD 5 , TSS, NH 3 , N0 2 + 3 and T-P. Mechanical failure prevented the collection
of dissolved oxygen data.
Samples collected for total coliforms were transferred to Connecticut
state personnel for analysis by their microbiologists.
Flow data from Fort Hill Brook was collected from 1500 on June 9 to 1200
on June 12, 1980.
1

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p . .,
FLRC11
1000 Yardc 1
Mumford Cove Study
Groton, Connecticut
June 9—12, 1980
VLRS1O
SRLHO9
LS2406
R1307

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STATION DESCR]PTI’ONS
FHBAO1 Fort Hill Brook upstream of Groton Town WWTP final effluent
FHBBO2 Groton Town WWTP final effluent
MCRRO3 Inner Mumford Cove at Railroad Bridge
MC0804 Station deleted
MC1AO5 Mouth of Mumford Cove at buoy lA
LS2406 Long Island Sound at buoy 24
1R1307 Intrepid Rock at buoy 13
HR2608 Horseshoe Reef at buoy 26
SRLHO9 Seaflower Reef light
VLRB1O Vixen Ledge buoy
FLRC11 Frank Ledge buoy
GH0612 Groton Harbor at buoy 6
PRO113 Poquonock River at buoy 1
3

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T!DE TIMES
06/10/80 0207 0759 1410 2018
06/11/80 0258 0850 1459 2108
06/12/80 0348 0942 1550 2155
4

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FIELD DATA
MUMFORD COVE
GROTON, CONNECTICUT
June 10-12, 1980
TIME TEMP. pH SALINITY CONDUCTIVITY
STATION DATE ( HOURS) ( °C) ( S.U.) ( 0/00) ( MICROMHOS/CM )
FHBAO1 06/10/80 1200 13 6.6
FHBAO1 06/11/80 1320 15 7.0
FHBAO1 06/12/80 1250 15 7.2
FHBBO2 06/10/80 1145 18 6.6
FHBBO2 06/11/80 1145 4 7.4
FHBBO2 06/12/80 1300 12 7.4
MCRRO3 06/10/80 1215 16 6.8
MCRRO3 06/11/80 1350 18 7.3
MCRRO3 06/12/80 1215 18 7.2
MC1AO5 06/10/80 0930 14 27.5 34.0
MC1AO5 06/10/80 1445 15 27.2 34.6
MC1AO5 06/11/80 0935 15 27.6 34.8
MC1AOS 06/11/80 1545 17 27.3 36.0
MC1AO5 06/12/80 1635 18 27.0 36.6
LS2406 06/10/80 0945 14 27.5 34.2
LS2406 06/10/80 1505 14 27.5 33.0
LS2406 06/11/80 0945 14 27.5 34.7
LS2406 06/11/80 1600 15 26.9 33.8
LS2406 06/12/80 1650 17 26.1 34.8
1R1307 06/10/80 0955 14 27.0 33.0
1R1307 06/11/80 0955 15 28.3 35.1
IR1307 06/12/80 1700 15 27.5 34.8
HR2608 06/10/80 0915 14 27.0 33.5
HR2608 06/10/80 1430 14 27.6 34.3
HR2608 06/11/80 0925 14 27.9 35.1
HR2608 06/11/80 1535 16 27.0 35.9
HR2608 06/12/80 1625 16 26.4 34.5
SRLHO9 06/10/80 0905 14 27.5 34.0
SRLHO9 06/11/80 0915 14 28.0 34.7
SRLHO9 06/12/80 1615 16 27.1 35.3
VLRB1O 06/10/80 0855 14 27.0 34.0
VLRB1O 06/11/80 0905 14 28.0 34.6
VLRB1O 06/12/80 1600 17 26.2 34.8
5

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FIELD DATA
MUMFORD COVE
GROTON, CONNECTICUT
June 10—12, 1980
TIME TEMP. pH SALINITY CONDUCTIVITY
STATION DATE ( HOURS) ( °C) ( S.U.Y ( 0/00) ( MICROMHOS/cM )
FLRC11 06/10/80 0835 14 27.0 33.0
FLRC11 06/10/80 1415 14 26.0 33.5
FLRC11 06/11/80 0855 14 27.0 33.9
FLRC11 06/11/80 1515 16 25.3 33.0
FLRC11 06/12/80 1545 17 24.0 32.9
GH0612 06/10/80 0825 14 30.0 23.5
GH0612 06/10/80 1400 15 22.8 29.7
GH0612 06/11/80 0840 14 25.2 32.0
0H0612 06/11/80 1505 17 20.8 29.0
GH0612 06/12/80 1535 18 20.9 29.0
PRO113 06/10/80 0810 13 24.0 29.0
PRO113 06/10/80 1340 14 28.0 33.5
PRO113 06/11/80 0830 14 27.3 34.2
PRO113 06/11/80 1445 17 23.7 31.9
PRO113 06/12/80 1515 18 22.7 31.3
6

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CHEMICAL DATA
Muinford Cove
Groton, Connecticut
dune 10-12, 1980
TIME CHLOROPHYLL a PHEOPHYTIN a
STATION DATE ( hOURS) ugh ugh
MC1AO5 06/10/80 0930 0.53 3.58
MC1AO5 06/10/80 1445 2.67 1.07
MC1AO5 06/11/80 0935 0.53 0.00
MC1AO5 06/11/80 1545 1.60 1.01
MC1AO5 06/12/80 1635 1.60 0.00
LS2406 06/10/80 0945 1.06 0.05
LS2406 06/10/80 1505 0.53 3.20
LS2406 06/11/80 0945 0.00 2.40
LS2406 06/11/80 1600 0.53 0.00
LS2406 06/12/80 1650 1.06 1.92
1R1307 06/10/80 0955 2.13 0.00
IR1307 06/11/80 0955 0.00 1.12
1R1307 06/12/80 1700 0.00 1.12
HR2608 06/10/80 0915 0.53 1.71
HR2608 06/10/8Q 1430 1.60 0.64
RR2608 06/11/80 0925 0.53 0.00
HR2608 06/11/80 1535 1.07 1.49
HR2608 06/12/80 1625 0.53 2.08
SRLHO9 06/10/80 0905 0.53 1.33
SRLHO9 06/11/80 0915 0.00 1.12
SRLHO9 06/12/80 1615 0.53 0.00
‘ThRB1O 06/10/80 0855 1.60 0.00
VLRB1O 06/11/80 0905 0.53 0.58
VLRB1O 06/12/80 1600 0.53 3.60
FLRC11 06/10/80 0835 1.60 0.64
FLRC11 06/10/80 1415 4.81 4.54
FLRC11 06/11/80 0855 0.00 7.47
FLRC11 06/11/80 1515 0.53 4.70
FLRC].1 06/12/80 1545 0.53 3.58
GH0612 06/10/80 0825 4.27 2.08
GH0612 06/10/80 1400 6.40 6.30
GH0612 06/11/80 0840 1.06 7.16
GH0612 06/11/80 1505 3.20 6.88
GH061 06/12/80 1535 S A M P L E L 0 S T
PRO113 06/10/80 0810 1.06 1.18
PRO1] .3 06/10/80 1340 2.67 3.31
PRO113 06/11/80 0830 0.53 0.00
PRO113 06/11/80 1445 1.06 3.41
PRO113 06/12/80 1515 1.60 8.49
7

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CHEMICAL DATA
Mumford Cove
Groton, Connecticut
June 10-12, 1980
TIME BOD TSS NH 3 NO 243 T-P
STATION DATE ( HOURS) ( mg/i) ( mg/i) ( mg/i) ( mg/i) ( mg/i )
FHBAO1 06/10/80 1200 1 K 2 0.16 1.54 0.01
FHBAO1 06/11/80 1320 1 1 0.26 2.70 0.01
FHBAO1 06/12/80 1250 1 K 7 0.05 J 2.60 0.01 J
FHBBO2 06/10/80 1i45 1 K 23 18.80 0.05 5.75
FHBBO2 06/11/80 1145 i 21 18.60 0.05 5.85
FHBBO2 06/12/80 1300 1 K 8 15.20 J 0.07 3.07 .3
MCRRO3 06/10/80 1215 1 K 14 12.80 0.70 3.75
MCRRO3 06/11/80 1350 5 12 11.80 0.71 2.45
MCRRO3 06/12/80 1215 8 9 10.60 J 0.78 2.28 3
MC1AO5 06/10/80 0930 1 10 0.05 K 0.02 0.04
MC1AO5 06/10/80 1445 2 6 J 0.10 0.04 0.11
MC1AO5 06/11/80 0935 1 4 0.05 0.03 0.02
MC1AO5 06/11/80 1545 2 6 0.13 0.04 0.14
MC1AO5 06/12/80 1635 2 6 J 0.07 0.02 K 0.08
LS2406 06/10/80 0945 2 K 8 0.05 K 0.03 0.02
LS2406 06/10/80 1505 2 K 6 0.05 K 0.07 0.03
LS2406 06/11/80 0945 2 K 4 0.05 0.02 K 0.04
LS2406 06/11/80 1600 2 K 6 0.05 0.10 0.03
LS2406 06/12/80 1650 2 K 11 0.05 K 0.04 0.03
1R1307 06/10/80 0955 2 K 8 0.05 K 0.03 0.02
1R1307 06/11/80 0955 2 K 4 0.05 K 0.04 0.02
IRi307 06/12/80 1700 2 6 0.05 K 0.03 0.01 K
HR2608 06/10/80 0915 2 K 9 0.05 K 0.03 0.02
HR2608 06/10/80 1430 2 K 8 0.05 K 0.07 0.02
HR2608 06/11/80 0925 2 K 4 0.05 K 0.02 0.03
HR2608 06/11/80 1535 2 K 4 0.05 K 0.05 0.02
HR2608 06/12/80 1625 2 K 6 0.05 K 0.05 0.02
S LH09 06/10/80 0905 2 K 9 0.05 K 0.02 K 0.02
SRLH O9 06/11/80 0915 2 K 12 0.05 K 0.02 K 0.02
SRLHO9 06/12/80 1615 2 K 9 0.05 K 0.05 0.02
VLRB1O 06/10/80 0855 2 K 8 0.05 K 0.03 0.03
VLRB1O 06/11/80 0905 2 K 8 0.05 K 0.04 0.03
VLRB1O - 06/12/80 1600 2 4 0.05 K 0.05 0.02
8

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CHEMICAL DATA
Murnford Cove
Groton, Connecticut
June 10—12, 1980
TIME BOD TSS NH 3 N0 2 + 3 T-P
STATION DATE ( HOURS) ( tug/i) ( mg/i) ( mg/i) ( mg/i) ( mg/i )
FLRC11 06/10/80 0835 3 10 0.05 K 0.04 0.03
FLRC].1 06/10/80 1415 1 7 0.05 0.11 0.04
FLRC11 06/11/80 0855 1 4 0.05 K 0.08 0.05
FLRC11 06/11/80 15i5 3 7 0.09 0.08 0.03
FLRC11 06/12/80 1545 3 9 0.05 K 0.06 0.04
GH0612 06/10/80 0825 1 K 10 0.05 K 0.08 0.04
GH0612 06/10/80 1400 4 10 0.06 0.12 0.04
GHO612 06/11/80 0840 1 11 0.05 K 0.13 0.04
GH0612 06/11/80 1505 2 8 0.06 0.14 0.03
GHO612 06/12/80 1535 3 7 0.05 K 0.11 0.03
PRO] .13 06/10/80 0810 1 10 0.05 K 0.04 0.03
PRO113 06/10/80 1340 1 12 0.05 0.07 0.04
PR O].13 06/11/80 0830 1 K 5 0.05 K 0.04 0.02
PR Oi13 06/11/80 1445 1 3 0.05 0.11 0.03
PRO113 06/12/80 1515 2 7 0.05 K 0.07 0.02
J - Value Estimated
K - Less Than
9

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MICROBIOLOGICAL DATA
MU ORD COVE
GROTON, CONNECTICUT
June 10—12, 1980
TIME
STATION DATE ( HOURS) TOTAL COLIFORMS/lOOmi
FHBAO1 06/10/80 1200 920
FHBAO1 06/11/80 1320 540
FHBAO1 06/12/80 1250 920
FHBBO2 06/10/80 1145 1.8 K
FHBBO2 06/11/80 1657 2
FHBBO2 06/12/80 1350 2400
MCRRO3 06/10/80 1215 1.8 K
MCRR O3 06/11/80 1350 130
MCRRO3 06/12/80 1215 2400 L
MC1AO5 06/10/80 0930 110
MC1A O5 06/10/80 1445 22
MC1AO5 06/11/80 0935 4.5
MC1AO5 06/11/80 1545 1.8 K
MC1AO5 06/12/80 1635 1.8 K
L 52406 06/10/80 0945 7.8
LS2406 06/10/80 1505 130
L 52406 06/11/80 0945 4
LS2406 06/11/80 1600 11
LS24O6 06/12/80 1650 4.5
1R1307 06/10/80 0955 6.8
1R1307 06/11/80 0955 1.8 K
1R1307 06/12/80 1700 2
HR2608 06/10/80 0915 7.8
HR2608 06/10/80 1430 170
HR2608 06/11/80 0925 9.2
HR2608 06/11/80 1535 9.3
HR2608 06/12/80 1625 13
SRLHO9 06/10/80 0905 4.5
SRLHO9 06/11/80 0915 4
SRLH O9 06/12/80 1615 1.8 K
VLRB1 O 06/10/80 0855 22
VLRB1O 06/11/80 0905 6.8
VLRB1O 06/12/80 1600 49
10

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MICROBIOLOGICAL DATA
MUMFORD COVE
GROTON, CONNECTICUT
June 10—12, 1980
TIME
STATION DATE ( HOURS) TOTAL COLIFOP.MS/lOOml
FLRC11 06/10/80 0840 79
FLIC1 1 06/10/80 1415 2400 L
FLRC11 06/11/80 0855 4
FLRC11 06/11/80 1515 240
FLRC1]. 06/12/80 1545 240
GH0612 06/10/80 0825 2400 L
GH0612 06/10/80 1400 2400 L
GH0612 06/11/80 0840 920
GH0612 06/11/80 1505 350
GH0612 06/12/80 1535 79
PRO113 06/10/80 0810 49
PRO113 06/10/80 1340 14
PRO113 06/11/80 0830 49
PRO113 06/11/80 1445 79
PRO113 06/12/80 1515 11
K - less than
L - more than
11

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FLOW DATA
FORT HILL BROOK
GROTON, CONNECTICUT
June 9—12, 1980
ISCO Model 1700 Flow Meter ISOC Model 1870 Flow Meter
START END FLOW START END FLOW
06/09/80 @ 1500 06/10/80 8 1500 207,847 ft 3
1,554,800 gals
06/10/80 8 1500 06/11/80 8 0400 117,576 ft 3
879,527 gals
06/11/80 8 1200 06/12/80 8 1200 103,171 ft 3
771,770 gals 06/11/80 8 1200 06/12/80 8 1200 98,012 ft 3
733,179 gals
Values corrected for leakage are as follows:
06/09/80 8 1500 06/10/80 8 1500 208,136 ft 3
1,556,961 gals
06/10/80 8 1500 06/11/80 8 0400 117,733 ft 3
880,698 gals
06/11/80 8 1200 06/12/80 8 1200 103,460 ft 3 06/11/80 8 1200 06/12/80 8 1200 98,301 ft 3
773,933 gals 735,341 gals

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Dye Area
I4umford ve
Groton, nnecticut
Conc*ntration Curves
• (rpb)
June 9,1980
High Tide 1927
13 1000 Yards —I

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0.0
!umford Covs
Grotci • Ornnscticut
ncsntraticn Curvsi
• - ( pb)
•June 10,1980
•H.tgh Tide 0759
14 1 l000Thrds :

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•1
S ,g.f
umford coy.
oton, ODnnscticut
Ccnc.ntratio Curvsi
(ppb)
June 10,1980
Low Tide 1410
15 1000 Yards

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!uaford cove
Groton, conn.cticut
! onc.ntraticfl Curves
(nb)
. une 10,1980
High Tide 2018
1000 Yards
16 $

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I
SQ
o.o
! nuford cove
Grotan, connecticut
Conc.ntraticn Curvsi
- (ppb)
June 11,1980
Low Tide 0258
11 1000 Yerdi

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0.l
!umford Covs
Groton, ODnnscticut
c.ntraticn Curwi
(ppb)
•June 11,1980
High Tide 0850
18 10•00 Yads

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Rumford Covs
oton, r2nsctiaut
nointraticz Curvss
- ( pb)
• June 11,1980
Low Tide 1459
0.0
I ..
g.
1000 Yard.
I
19
I
I

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3—
I,
—I .’,
0.0
aumford coy.
Gxoton, coxm.cticut
Conontraticii Curvsi
(ppb)
June 11,1980
High Tide 2108
3000 Yards
20 H

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uiuford coy.
Groton, conn.cticut
ncntraticn Ciarvsa
(ppb)
June 12,1980
Low Tide 0348
i.s /
I
I
1000 Yard..
I
21
$
I

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Jumford coY.
oton, connecticut
Cc s csntrati Curves
( pb)
June 12,1980
High Tide 0942
I
/
41
j%S
I
6.0k
I
1000 Yards
I
22
I
p

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0 .0
!umford Covs
Groton, nn.ctiaut
Co ncsntration Curvsi
(ppb)
June 12,1980
Low Tide 1550
23 1000 —

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Dye Area
*mtford Cove
Groton, Connecticut
Csnt*r of Mass Curves
(pounds)
June 9,1980
High Tide 1927
24 1000 Yards —I

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0 .)
Mumford Cove
Groton, Connecticut
Csntsr of Nasa Curves
(pounds)
June 10,1980
High Tide 0759
0.3
L
1000 Yardi
25
I

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0 3
F
ñumford Cove
oton, Connscticut
Csntsr of l4ass Curvsi
(pounds)
June 10, 1980
Low Tide 1410
26 1000 Yardg —1

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0,3
.\
I
IIu ford Cove
Groton, Connscticut
Csnter of Ilase Curv•s
(pounds)
June 10,1980
High Tide 2018
27 1000

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o.S
(0
0. Z
I
I ford Cove
oton, Conn.cticut
CSntSr of Idass Curves
(pounds)
June 11,1980
I w Tide 0258
2 1000 Yards
8

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.\
I
Iiun ford Cove
Groton, Connecticut
canter of Nass Curves
- (pounds)
June 11,1980
High Tide 0850
29 1. 1000 Yards
I

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I ,
,0
..ipS ’
&uuford cove
Groton, connecticut
Center of Mass Curves
(pounds)
June 11,1980
Low Tide 1459
30 1000 Yardi

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* mford Cove
oton, Connecticut
Center of Nase Curves
(pounds)
June 11,1980
High Tide 2108
31 I 1000 Yards
I

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lëumford Cove
Groton, Connecticut
Csntar of Kale Curves
(pounds)
June 12,1980
LOW Tide 0348
32 F 1000 Yards

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a-’.
iiu ford Cove
Groton, Connecticut
Center of 14ass Curves
(pounds)
June 12,1980
High Tide 0942
1000 Yards I
0.I
F
I -
33 1
I

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0.04
Itwaford Cove
Groton, Connecticut
Csnts of liass Curves
(pounds)
June 12,1980
Low Tide 1550
F 1000 Yards —I

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