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Comal and San Marcos Springs
Sampling ProgramPresented to the EAHCP Science Committee
February 11, 2015
Philip C. Pearce, P.G.
Comal and San Marcos Springs Sampling Program
Summary of 2014 Effort
Surface Water (base flow) Sampling
Two events; spring and fall
Stormwater Sampling
Two events; Comal Springs September 26-27 and
November 4-5, 2014
Two events; San Marcos Springs May 12-13 and July 15-16, 2014
Sediment Sampling
One event; June 25-26, 2014
Passive Diffusion Sampling (PDS)
Six events; March, April (Not Analyzed),
June, August, October, December
Sample Naming Conventions
Comal Springs
5 sample locations for each sample type
San Marcos Springs
7 sample locations for each sample type
Sample LocationsComal Springs: 10 and 20
Sample LocationsComal Springs: 30 - 70
Sample LocationsSan Marcos Springs: 10 - 40
Sample LocationsSan Marcos Springs: 50 - 70
Analyses
Surface Water (Base Flow) and Stormwater
General Water Quality Parameters, VOCs, SVOCs,
Organochlorine Pesticides, Organophosphorous Pesticides,
Chlorinated Herbicides, PCBs, Metals, E. coli, Caffeine
Sediment
Same analyses minus the General Water Quality
Parameters, E. coli, and Caffeine
PDS
Suite of VOCs, SVOCs, and Pesticides
ResultsSurface Water (Base Flow)
Surface Water
(Base Flow)
Compared to 2014 Texas Surface Water
Quality Standard for E. coli in primary
recreational waters
Individual limit is 399 MPN/100 mL
Geometric Mean Limit – 126 MPN/100 mL
2014 Range:
25.9 MPN/100 mL to 579 MPN/100 mL
Two 2014 samples exceeded individual limit
of 399 MPN/100 mL
HCS 110 Mar 579 MPN/100 mL
HCS 120 Sept 470 MPN/100 mL
Maximum geometric mean exceeded:
2014 Overall: 139 MPN/100 mL
Sept. 2014: 229 MPN/100 mL
Comal Springs
Bacteria Counts
0
400
800
1200
1600
2000
HCS 110 HCS 120 HCS 130 HCS 140 HCS 160 GeometricMean
E. c
oli
Co
un
t (M
PN
/10
0 m
L)
Apr-13 Oct-13
Mar-14 Sep-14
Individual Sample Limit Geometric Mean Limit
Surface Water
(Base Flow)
Compared to 2014 Texas Surface Water
Quality Standard for E. coli in primary
recreational waters
2014 Range:
1 MPN/100 mL to 460 MPN/100 mL
One 2014 sample exceeded individual limit
of 399 MPN/100 mL
HSM 130 Sept 460 MPN/100 mL
San Marcos Springs
Bacteria Counts
0
100
200
300
400
500
HSM 110 HSM 120 HSM 130 HSM 140 HSM 150 HSM 160 HSM 170 GeometricMean
E. c
oli
Co
un
t (M
PN
/10
0 m
L)
Apr-13 Oct-13Mar-14 Sep-14Individual Sample Limit Geometric Mean Limit
Surface Water
(Base Flow)
Range: <1.9 to 66 ng/L
No standard for comparison but can
indicate anthropogenic influence
Comal Springs
Caffeine Detections
0
10
20
30
40
50
60
70
HCS110 HCS120 HCS130 HCS140 HCS160
Caf
fein
e (
ng/
L)
March 2014 September 2014
Surface Water
(Base Flow)
Range: <1.9 to 70 ng/L
No standard for comparison but can
indicate anthropogenic influence
San Marcos Springs
Caffeine Detections
0
20
40
60
80
HSM110 HSM120 HSM130 HSM140 HSM150 HSM160 HSM170
Caf
fein
e (
ng/
L)
March 2014 September 2014
Other Surface Water (Base Line) Detections
VOCs
HSM150 March 2014: Toluene 0.37 J µg/L
Surface Water (Base Line) Analyses with No Detections
No SVOCs
No PCBs
No Organochlorine Pesticides
No Organophosphorous Pesticides
No Herbicides
No Metals Detected Above Drinking Water Standards
(MCLs)
Sediment
Sediment Collection Methods
Three closely spaced sample locations
where sediment was present
Sample interval of 0-18 inches was
composited
Sediment Sampling
Results compared to Guidelines developed by
MacDonald et al. 2000 and the TCEQ (2012)
Probable Effect Concentration (PEC)
Concentrations above the PEC have a probable toxic
effect on aquatic life
Threshold Effect Concentration (TEC)
Concentrations below the TEC are not expected to have a
toxic effect on aquatic life
Texas-Specific Soil Background Concentrations
(TSSBC)
Sediment Sampling
PEC = 22.8 mg/kg
Exceeded at:
2013
HSM330 (52.2188 mg/kg)
HSM340 (57.329 mg/kg)
2014
HSM320 (40.6 mg/kg)
HSM330 (103.9 mg/kg)
HSM350 (24.5 mg/kg)
TEC = 1.610 mg/kg
Exceeded at:
2013
HCS320 (14.247 mg/kg)
HCS360 (4.3275 mg/kg)
HSM350 (5.5308 mg/kg)
2014
HCS330 (11.08 mg/kg)
SVOCs – Total PAH
0
20
40
60
80
100
Tota
l PA
H (
mg/
kg)
2013 2014 TEC PEC
Sediment Sampling
TEC = 9.79
Exceeded
2013 HSM310 (2.05 mg/kg)
HSM320 (9.82 mg/kg)
2014 HSM310 (11.5 mg/kg)
Metals - Arsenic
0
5
10
15
20
25
30
35
HCS310 HCS320 HCS330 HCS340 HCS360 HSM310HSM320HSM330HSM340HSM350HSM360HSM370
Ars
en
ic (
mg/
kg)
Arsenic
2013 2014 TEC PEC TSSBC
Sediment Sampling
TEC = 43.4 mg/kg
Exceeded
HSM320 (63.4 mg/kg)
HSM340 (63.8 mg/kg)
Metals - Chromium
0
20
40
60
80
100
120
HCS310 HCS320 HCS330 HCS340 HCS360 HSM310 HSM320 HSM330 HSM340 HSM350 HSM360 HSM370
Ch
rom
ium
(m
g/kg
)
Chromium
2013 2014 TEC PEC TSSBC
Sediment Sampling
TEC = 31.6 mg/kg
Exceeded
HSM320 (37.2 mg/kg)
HSM320 (89.3 mg/kg)
Metals - Copper
0
50
100
150
Co
pp
er
(mg/
kg)
Copper
2013 2014 TEC PEC TSSBC
Sediment Sampling
PEC = 128 mg/kg
Exceeded
HSM340 (235 mg/kg)
TEC = 35.8 mg/kg
Exceeded
2013 HCS360 (36.7 mg/kg)
HSM350 (35.6 mg/kg)
2014 FDHCS360 (38.3 mg/kg)
HSM320 (78.7 mg/kg)
HSM330 (90.7 mg/kg)
HSM340 (235 mg/kg)
Metals - Lead
0
50
100
150
200
250
Lead
(m
g/kg
)
Lead
2013 2014 TEC PEC TSSBC
Sediment Sampling
TEC = 121 mg/kg
Exceeded
2014 HCS310 (228 mg/kg)
HSM320 (246 mg/kg)
Metals - Zinc
0
50
100
150
200
250
300
350
400
450
500
HCS310 HCS320 HCS330 HCS340 HCS360 HSM310HSM320HSM330HSM340HSM350HSM360HSM370
Zin
c (m
g/kg
)
Zinc
2013 2014 TEC PEC TSSBC
Sediment Sampling
PEC = 4.98 mg/kg
Exceeded
2013 HCS340 (12.2 mg/kg)
No detections in 2014
TSSBC Not Established
Metals - Cadmium
0
2
4
6
8
10
12
14
HCS310 HCS320 HCS330 HCS340 HCS360 HSM310HSM320HSM330HSM340HSM350HSM360HSM370
Cad
miu
m (
mg/
kg)
Cadmium
2013 2014 TEC PEC
Sediment Sampling
TEC = 22.7 mg/kg
Exceeded
2013 HCS340 (27.1 mg/kg)
Metals - Nickel
0
5
10
15
20
25
30
35
40
45
50
HCS310 HCS320 HCS330 HCS340 HCS360 HSM310HSM320HSM330HSM340HSM350HSM360HSM370
Nic
kel (
mg/
kg)
Nickel
2013 2014 TEC PEC TSSBC
Sediment Sampling
PEC = 17.6 µg/kg
Exceeded
2013 HSM340 (75.85 µg/kg)
2014 HSM 340 (110 µg/kg)
TEC = 3.24 µg/kg
Exceeded
2013 HCS310 (6.492 µg/kg)
HCS320 (4.7256 µg/kg)
HCS340 (11.675 µg/kg)
Organochlorine Pesticides - Chlordane
0
20
40
60
80
100
120
Ch
lord
ane
(µ
g/kg
)
2013 2014 TEC PEC
Sediment Sampling
TEC = 3.16 µg/kg
Exceeded
2014 HSM340 (21 µg/kg)
Organochlorine Pesticides – 4,4’-DDE
0
5
10
15
20
25
30
35
4,4
'-D
DE
(µg/
kg)
2013 2014 TEC PEC
Sediment Sampling
TEC = 4.16 µg/kg
Exceeded
2014 HSM340 (13 µg/kg)
Organochlorine Pesticides – 4,4’-DDT
0
10
20
30
40
50
60
4,4
'-D
DT
(µg/
kg)
2013 2014 TEC PEC
Sediment Sampling
TEC = 1.9 µg/kg
Exceeded
2013 HSM340 (2.04 µg/kg)
Organochlorine Pesticides - Dieldrin
0
10
20
30
40
50
60
Die
ldri
n (
µg/
kg)
2013 2014 TEC PEC
Sediment Analyses With No Detections
No VOCs
No Organophosphorous Pesticides
No Herbicides
No PCBs
Stormwater
Lead Sample Initiated
Peak Sample Initiated
Trail Sample Initiated
9/26/2014 12:00 9/27/2014 0:00 9/27/2014 12:00
Turb
idity (N
TU)
Stream
flow
(cfs)Tu
rbid
ity
Co
nd
uct
ivit
y (u
S/cm
)Te
mp
era
ture
(C
)Comal River Storm Water Quality Graph September 26-27, 2014
Sp. Conductivity Temperature Turbidity Streamflow
575 µS/cm24.25°C
475µS/cm23.5°C
40 NTU105 cfs
0 NTU80 cfs
Total Rainfall: 0.75-1.0 in
Lead Sample Initiated
Trail Sample Initiated
Peak Sample Initiated
11/4/2014 18:00 11/5/2014 0:00 11/5/2014 6:00 11/5/2014 12:00
Turb
idity (N
TU)
Stream
flow
(cfs)Sp
eci
fic
Co
nd
uct
ivit
y (u
S/cm
)Te
mp
era
ture
(C
)Comal River Storm Water Quality Graph November 4-5, 2014
Sp. Conductivity Temperature Turbidity Streamflow
50% Recovery
Seco
nd
ary
Sto
rmEv
ent
600 µS/cm24°C
350 µS/cm18°C
50 NTU170 cfs
0 NTU90 cfs
Total Rainfall: 2-3 in
Lead Sample Initiated
Peak Sample Initiated
Trail Sample Initiated
5/12/14 12:00 5/13/14 0:00 5/13/14 12:00
Turb
idity (N
TU)
Stream
flow
(cfs)Sp
eci
fic
Co
nd
uct
ivit
y (u
S/cm
) Te
mp
era
ture
(C
)San Marcos Storm Water Quality Graph May 12-13, 2014
Sp. Conductivity Temperature Turbidity Streamflow
650 µS/cm
24°C
150 µS/cm
20°C
450 NTU290 cfs
0 NTU100 cfs
Total Rainfall: 3-4 in
Peak Sample Initiated
Trail Sample InitiatedLead Sample Initiated
7/15/2014 18:00 7/16/2014 0:00 7/16/2014 6:00
Turb
idity (N
TU)
Stream
flow
(cfs)Sp
eci
fic
Co
nd
uct
ivit
y (u
S/cm
)Te
mp
era
ture
(C
)San Marcos Storm Water Quality Graph July 15-16, 2014
Sp. Conductivity Temperature Turbidity Streamflow
625 µS/cm25°C
225 µS/cm22°C
600 NTU375 cfs
0 NTU125 cfs
Total Rainfall: 0.5-1.0
in
Comal Springs Storm
September 26-27, 2014
Bacteria Counts
Range: 150 – 5500 MPN/100 mL
Geometric Mean: 1396 MPN/100 mL
Recreational Water Standards:
Geometric Mean: <126
Individual samples: <399
Geometric Mean and all but one
individual sample exceeded
480
500
520
540
560
580
80
85
90
95
100
105
9/26/2014 12:00 9/27/2014 0:00 9/27/2014 12:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
char
ge (
cfs)
Discharge
Specific Conductivity
0
1000
2000
3000
4000
5000
9/26/14 12:00 9/27/14 0:00 9/27/14 12:00
E. c
oli
Co
un
t (M
PN
/10
0m
L)
HCS 210
HCS 240
HCS 250
HCS 260
HCS 270
Comal Springs Storm
November 4-5, 2014
Bacteria Counts
Range: 510 – 2400 MPN/100 mL
Geometric Mean: 1090 MPN/100 mL
Recreational Water Standards:
Geometric Mean: <126
Individual samples: <399
Geometric Mean and all individual
samples exceeded limits
350
400
450
500
550
600
90
100
110
120
130
140
150
160
170
11/4/2014 12:00 11/5/2014 0:00 11/5/2014 12:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
char
ge (
cfs)
Discharge
Specific Conductivity
0
500
1000
1500
2000
2500
3000
11/4/14 12:00 11/5/14 0:00 11/5/14 12:00
E. c
oli
Co
un
t (M
PN
/10
0m
L)
HCS 210
HCS 240
HCS 250
HCS 260
HCS 270
San Marcos Springs Storm
May 12-13, 2014
Bacteria Counts
Range: 820 – 120,000 MPN/100mL
Geometric Mean: 7424 MPN/100 mL
Recreational Water Standards:
Geometric Mean: <126
Individual samples: <399
Geometric Mean and all individual
samples exceeded limits
150
250
350
450
550
650
100
150
200
250
300
5/12/2014 12:00 5/13/2014 0:00 5/13/2014 12:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
char
ge (
cfs)
Discharge
Specific Conductivity
0
20000
40000
60000
80000
100000
120000
5/12/14 12:00 5/13/14 0:00 5/13/14 12:00
E. c
oli
Co
un
t (M
PN
/10
0m
L) HSM210
HSM230
HSM231
HSM240
HSM250
HSM260
HSM270
San Marcos Springs Storm
July 15-16, 2014
Bacteria Counts
Range: 310 – 24,000 MPN/100 mL
Geometric Mean: 8223 MPN/100 mL
Recreational Water Standards:
Geometric Mean: <126
Individual samples: <399
Geometric Mean and all but one
individual sample exceeded limits
0
5000
10000
15000
20000
25000
7/15/14 18:00 7/16/14 6:00
E. c
oli
Co
un
t (M
PN
/10
0m
L) HSM210
HSM230
HSM231
HSM240
HSM250
HSM260
HSM270
200
250
300
350
400
450
500
550
600
100
150
200
250
300
350
400
7/15/2014 18:00 7/16/2014 6:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
chag
re (
cfs)
Discharge
Specific Conductivity
Comal Springs Storm
September 26-27, 2014
Caffeine
Range: 13 – 600 ng/L
480
500
520
540
560
580
80
85
90
95
100
105
9/26/2014 12:00 9/27/2014 0:00 9/27/2014 12:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
char
ge (
cfs)
Discharge
Specific Conductivity
0
50
100
150
200
250
300
350
9/26/14 12:00 9/27/14 0:00 9/27/14 12:00
Caf
fein
e (
ng/
L) HCS 210
HCS 240
HCS 250
HCS 260
HCS 270
Comal Springs Storm
November 4-5, 2014
Caffeine
Range: 13 – 510 ng/L
0
100
200
300
400
500
600
11/4/14 12:00 11/5/14 0:00 11/5/14 12:00
Caf
fein
e (
ng/
L) HCS 210
HCS 240
HCS 250
HCS 260
HCS 270
350
400
450
500
550
600
90
100
110
120
130
140
150
160
170
11/4/2014 12:00 11/5/2014 0:00 11/5/2014 12:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
char
ge (
cfs)
Discharge
Specific Conductivity
San Marcos Springs Storm
May 12-13, 2014
Caffeine
Range: 6.9 – 1500 ng/L
150
250
350
450
550
650
100
150
200
250
300
5/12/2014 12:00 5/13/2014 0:00 5/13/2014 12:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
char
ge (
cfs)
Discharge
Specific Conductivity
0
500
1000
1500
5/12/14 12:00 5/13/14 0:00 5/13/14 12:00
Caf
fein
e (
ng/
L)
HSM 210
HSM 230
HSM 231
HSM 240
HSM 250
HSM 260
HSM 270
San Marcos Springs Storm
July 15-16, 2014
Caffeine
Range: 21 – 2800 ng/L
200
250
300
350
400
450
500
550
600
100
150
200
250
300
350
400
7/15/2014 18:00 7/16/2014 6:00
Sp. C
on
du
ctiv
ity
(µS/
cm)
Dis
chag
re (
cfs)
Discharge
Specific Conductivity
0
1000
2000
3000
7/15/14 18:00 7/16/14 6:00
Caf
fein
e (
ng/
L)
HSM 210
HSM 230
HSM 231
HSM 240
HSM 250
HSM 260
HSM 270
2013 Stormwater Exceedances not detected in 2014
2013:
Arsenic HCS 210 Trail – 11.4 µg/L (MCL 10)
Antimony HSM 231 Lead – 10.3 µg/L (MCL 6 µg/L)
Stormwater Analyses Not Detected Above Drinking Water Standards
No VOCs (Some J Flagged in Nov. HCS 210, HCS 240, HCS 250, HCS 270; one J flag in May HSM 250; some J flagged in July HSM 230, HSM 231, HSM 240, HSM 250, HSM 260, HSM 270)
No SVOCs (Some J Flagged in Nov. HCS 260)
No Organochlorine Pesticides (One detection: Beta-BHC 0.1 µg/L in Nov HCS 270)
No Organophosphorous Pesticides (No detections)
No Herbicides (No detections)
No PCBs (No detections)
No Metals (Some detections)
PDS
PDS
Amplified Geochemical Imaging, LLC (AGI)
Passive Diffusion Samplers
Sorbent material concentrates trace
compounds from the environment
SVOCs
VOCs
Organochlorine Pesticides
2-week deployment periods in March, April,
June, August, October, December
PDS
Many samplers lost in
March and April
deployments
SWCA staff designed and
constructed protective
deployment devices
PDS Results
Comal Springs - VOCs
BTE
X
Ch
loro
form
Eth
ylb
en
zen
e
Pe
nta
de
can
e
Tetr
ach
loro
eth
en
e
Tolu
en
e
1,2
,4-T
rim
eth
ylb
en
zen
e
p/m
-Xyl
en
e
o-X
yle
ne
TPH
Location
Month
2014 (µg) (µg) (µg) (µg) (µg) (µg) (µg) (µg) (µg) (µg)
HCS410 March <0.02 0.06 <0.02 0.22 0.08 <0.02 <0.02 <0.02 <0.02 1.85
April NA NA NA NA NA NA NA NA NA NA
June 0.03 <0.02 <0.02 <0.05 0.11 <0.02 <0.02 0.03 <0.02 2.64
August <0.02 0.04 <0.02 <0.05 0.04 <0.02 <0.02 <0.02 <0.02 2.01
October <0.02 0.1 <0.02 <0.05 0.03 <0.02 <0.02 <0.02 <0.02 1.60
December <0.02 0.08 <0.02 <0.05 0.07 <0.02 <0.02 <0.02 <0.02 <0.50
HCS420 March NA NA NA NA NA NA NA NA NA NA
April NA NA NA NA NA NA NA NA NA NA
June <0.02 <0.02 <0.02 <0.05 0.23 <0.02 <0.02 <0.02 <0.02 1.03
August <0.02 <0.02 <0.02 <0.05 0.14 <0.02 <0.02 <0.02 <0.02 1.16
October <0.02 <0.02 <0.02 <0.05 0.16 <0.02 <0.02 <0.02 <0.02 2.19
December <0.02 <0.02 <0.02 <0.05 0.23 <0.02 <0.02 <0.02 <0.02 <0.50
HCS430 March 0.02 <0.02 <0.02 0.15 0.57 0.02 <0.02 <0.02 <0.02 5.07
April NA NA NA NA NA NA NA NA NA NA
June <0.02 <0.02 <0.02 <0.05 0.21 <0.02 <0.02 <0.02 <0.02 1.00
August NA NA NA NA NA NA NA NA NA NA
October <0.02 <0.02 <0.02 <0.05 0.26 <0.02 <0.02 <0.02 <0.02 1.64
December <0.02 <0.02 <0.02 <0.05 0.38 <0.02 <0.02 <0.02 <0.02 0.50
PDS Results
Comal Springs – VOCs Continued
BTE
X
Ch
loro
form
Eth
ylb
en
zen
e
Pe
nta
de
can
e
Tetr
ach
loro
eth
en
e
Tolu
en
e
1,2
,4-T
rim
eth
ylb
en
zen
e
p/m
-Xyl
en
e
o-X
yle
ne
TPH
Location
Month
2014 (µg) (µg) (µg) (µg) (µg) (µg) (µg) (µg) (µg) (µg)
HCS440 March NA NA NA NA NA NA NA NA NA NA
April NA NA NA NA NA NA NA NA NA NA
June <0.02 <0.02 <0.02 <0.05 0.45 <0.02 0.03 <0.02 <0.02 1.81
August 0.02 <0.02 <0.02 <0.05 0.41 0.02 <0.02 <0.02 <0.02 1.48
October <0.02 <0.02 <0.02 <0.05 0.33 <0.02 <0.02 <0.02 <0.02 1.13
December <0.02 <0.02 <0.02 <0.05 0.53 <0.02 <0.02 <0.02 <0.02 <0.50
FDHCS440 March NA NA NA NA NA NA NA NA NA NA
April NA NA NA NA NA NA NA NA NA NA
June <0.02 <0.02 <0.02 <0.05 0.45 <0.02 0.03 <0.02 <0.02 1.62
August 0.03 <0.02 <0.02 <0.05 0.42 0.03 <0.02 <0.02 <0.02 1.50
October <0.02 <0.02 <0.02 <0.05 0.30 <0.02 <0.02 <0.02 <0.02 1.51
December <0.02 <0.02 <0.02 <0.05 0.47 <0.02 <0.02 <0.02 <0.02 <0.50
HCS460 March NA NA NA NA NA NA NA NA NA NA
April NA NA NA NA NA NA NA NA NA NA
June 0.23 <0.02 0.02 <0.05 0.19 <0.02 0.03 0.14 0.07 3.09
August 0.29 <0.02 0.03 <0.05 0.17 <0.02 <0.02 0.18 0.08 3.37
October <0.02 <0.02 <0.02 <0.05 0.18 <0.02 <0.02 <0.02 <0.02 1.86
December <0.02 <0.02 <0.02 <0.05 0.31 <0.02 <0.02 <0.02 <0.02 <0.50
PDS Results
Comal Springs - SVOCs
Flu
ore
ne
Ph
en
anth
ren
e
Location Month 2014 (µg) (µg)
HCS410 March <0.05 <0.05
April NA NA
June <0.05 2.72
August <0.05 <0.05
October <0.05 <0.05
December <0.05 <0.05
HCS440 March NA NA
April NA NA
June <0.05 1.44
August 0.06 <0.05
October <0.05 <0.05
December <0.05 <0.05
HCS460 March NA NA
April NA NA
June <0.05 3.72
August <0.05 <0.05
October <0.05 <0.05
December <0.05 <0.05
PDS Results
San Marcos Springs - VOCs
BTE
X
Pe
nta
de
can
e
Tetr
ach
loro
eth
en
e
Tolu
en
e
TPH
Un
de
can
e
Location Month 2014 (µg) (µg) (µg) (µg) (µg) (µg)
HSM410 March 0.05 0.07 <0.02 0.05 3.19 <0.05
April NA NA NA NA NA NA
June 0.05 <0.05 <0.02 0.05 2.56 <0.05
August <0.02 <0.05 <0.02 <0.02 1.31 <0.05
October <0.02 <0.05 <0.02 <0.02 1.38 <0.05
December <0.02 <0.05 <0.02 <0.02 0.65 <0.05
HSM420 March <0.02 0.05 0.24 <0.02 1.13 <0.05
April NA NA NA NA NA NA
June <0.02 <0.05 0.06 0.05 1.49 <0.05
August <0.02 <0.05 0.08 <0.02 1.52 <0.05
October <0.02 <0.05 0.07 <0.02 1.40 <0.05
December <0.02 <0.05 0.09 <0.02 0.63 <0.05
HSM430 March NA NA NA NA NA NA
April NA NA NA NA NA NA
June <0.02 <0.05 0.47 <0.02 2.57 <0.05
August <0.02 <0.05 0.49 <0.02 1.06 <0.05
October <0.02 <0.05 0.38 <0.02 2.15 <0.05
December <0.02 <0.05 0.43 <0.02 <0.50 <0.05
PDS Results
San Marcos Springs – VOCs Continued
BTE
X
Pe
nta
de
can
e
Tetr
ach
loro
eth
en
e
Tolu
en
e
TPH
Un
de
can
e
Location Month 2014 (µg) (µg) (µg) (µg) (µg) (µg)
FDHSM430 March NA NA NA NA NA NA
April NA NA NA NA NA NA
June <0.02 <0.05 0.47 <0.02 2.02 0.08
August <0.02 <0.05 0.44 <0.02 1.13 <0.05
October <0.02 <0.05 0.40 <0.02 1.29 <0.05
December <0.02 <0.05 0.43 <0.02 0.52 <0.05
HSM440 March NA NA NA NA NA NA
April NA NA NA NA NA NA
June <0.02 <0.05 0.16 <0.02 1.81 <0.05
August <0.02 <0.05 0.13 <0.02 1.40 <0.05
October <0.02 <0.05 0.15 <0.02 1.51 <0.05
December <0.02 <0.05 0.16 <0.02 <0.50 <0.05
HSM450 March 0.04 0.23 0.19 0.04 4.24 <0.05
April NA NA NA NA NA NA
June <0.02 <0.05 0.06 <0.02 1.17 <0.05
August <0.02 <0.05 0.08 <0.02 1.41 <0.05
October <0.02 <0.05 0.05 <0.02 1.40 <0.05
December <0.02 <0.05 0.05 <0.02 0.58 <0.05
PDS Results
San Marcos Springs – VOCs Continued
BTE
X
Pe
nta
de
can
e
Tetr
ach
loro
eth
en
e
Tolu
en
e
TPH
Un
de
can
e
Location Month 2014 (µg) (µg) (µg) (µg) (µg) (µg)
HSM460 March <0.02 <0.05 0.16 <0.02 0.63 <0.05
April NA NA NA NA NA NA
June <0.02 <0.05 0.09 <0.02 1.34 <0.05
August <0.02 <0.05 0.10 <0.02 1.52 <0.05
October <0.02 <0.05 0.10 <0.02 1.24 <0.05
December <0.02 <0.05 0.12 <0.02 <0.50 <0.05
HSM470 March NA NA NA NA NA NA
April NA NA NA NA NA NA
June <0.02 <0.05 0.10 <0.02 2.14 <0.05
August <0.02 <0.05 0.12 <0.02 1.67 <0.05
October <0.02 <0.05 0.11 <0.02 1.44 <0.05
December <0.02 <0.05 0.10 <0.02 <0.50 <0.05
PDS Results
San Marcos Springs – SVOCs
Flu
ora
nth
en
e
Ph
en
anth
ren
e
Pyr
en
e
Location Month 2014 (µg) (µg) (µg)
HSM410 March <0.05 <0.05 <0.05
April NA NA NA
June <0.05 1.73 <0.05
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
HSM430 March NA NA NA
April NA NA NA
June 4.74 8.70 2.21
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
FDHSM430 March NA NA NA
April NA NA NA
June 4.21 7.49 1.85
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
HSM440 March NA NA NA
April NA NA NA
June <0.05 2.02 <0.05
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
HSM450 March <0.05 <0.05 <0.05
April NA NA NA
June 1.38 2.52 0.86
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
HSM460 March <0.05 <0.05 <0.05
April NA NA NA
June 1.79 2.76 1.10
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
Flu
ora
nth
en
e
Ph
en
anth
ren
e
Pyr
en
e
Location Month 2014 (µg) (µg) (µg)
HSM470 March NA NA NA
April NA NA NA
June 1.68 3.01 1.06
August <0.05 <0.05 <0.05
October <0.05 <0.05 <0.05
December <0.05 <0.05 <0.05
Flu
ora
nth
en
e
Ph
en
anth
ren
e
Pyr
en
e
Location Month 2014 (µg) (µg) (µg)
2014 PDS Results
Tetrachloroethene
0
0.2
0.4
0.6
HCS410 HCS420 HCS430 HCS440 FDHCS440 HCS460
June August October December
0
0.1
0.2
0.3
0.4
0.5
HSM410 HSM420 HSM430 FDHSM430 HSM440 HSM450 HSM460 HSM470
Not
Analy
zed
Tetr
achlo
roeth
ene (
µg)
2014 PDS Results
Total SVOCs
0
1
2
3
4
HCS 410 HCS 420 HCS 430 HCS 440 HCS 460
June August
Not
Analy
zed (
June)
0
4
8
12
16
HSM 410 HSM 420 HSM 430 HSM 440 HSM 450 HSM 460 HSM 470
Tota
l SVO
Cs
(µg)
Observations
Lead and Chlordane in sediments at HSM 340
above PEC in 2014
Plasticizers in sediment in 2013 & 2014
DEHP found throughout Comal and San Marcos
in 2013 but attributed to laboratory artifact.
Also found in 2014 at HSM 320, 330 and 350.
Caffeine in Base Flow and Stormwater.
Results mimic E. coli results.
Observations
Essentially no VOCs or SVOCs in Base Flow or
Stormwater. However several VOCs were detected
across multiples sample sites and dates in PDS.
SVOCs detected in PDS during only one month (June)
No PDS Pesticide Detections
No PCB detections in any sample type
Questions?