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Woods Hole Coastal and Marine Science Center

Submarine Hydrogeological Data from Cape Cod National Seashore

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Table 6: Field and laboratory data for groundwater samples.

Field measurements were made using a calibrated YSI 650 Multi-Parameter Data Sonde.

Nutrient samples were analyzed on 23 January 2006 by K. Lee, National Park Service, Cape Cod
National Seashore, using a Lachat QuickChem Flow Injection Analysis System.

Lachat Methods:

N as NH3; Method Detection Limit = 4 µg N/L; Lachat QuikChem Method 10-107-06-1-C rev 27Nov01
(based on Environmental Protection Agency (EPA) method 350.1).

N as NO3/NO2 (cadmium reduction); Method Detection Limit = 1.7 µg N/L;
Lachat QuikChem Method 31-107-04-1-C rev. 16Sept03 (based on Grasshoff, 1976)

P as PO4; Method Detection Limit 0.1 µg P/L; Lachat QuikChem Method 10-115-01-1-M
rev. 27Aug03 (based on EPA method 365.1)

Total Dissolved Nitrogen (TDN)/ Total Dissolved Phosphorus (TDP) Method Notes:

Samples were prepared by persulfate digestion (following Valderrama, 1981) pior to analysis
by Lachat Methods. Sample results with an asterisk indicate TDP < Inorganic phosphorus. Values
are very close; typically this represents that all of the phosphorus is in the dissolved
inorganic state.

BDL - Stands for "below detection limit".

 

Sample Location Approx. Water Depth at Time of Sampling
(cm)
Depth Below Sediment Surface
(cm)
Temperature
(C)
Conductivity
(mS/m)
Salinity
(ppt)
Dissolved Oxygen
(% saturation)
Dissolved Oxygen
(mg/L)
pH Oxidation-Reduction Potential
(mV)
N-NH3
(µg/L)
N-NO3/NO2
(µg/L)
P-PO4
(µg/L)
Total Dissolved P (TDP)
as PO4
(µg/L)
Total Dissolved N (TDN)
as NO3
(µg/L)
SP2005-1 Surface Water 0 0 20.47 47.17 30.74 98 7.42 8.34 60.0 54 9 52 89 394
SP2005-1 200 152 23.26 46.79 30.46 8.6 0.61 8.23 -219.3 1060 BDL 1027 1413 3045
SP2005-1 200 304 18.74 44.91 29.11 7.5 0.58 8.45 -193.4 856 BDL 981 1269 2457
SP2005-1 200 427 17.4 4.422 2.37 11.5 1.06 7.03 -128.3 2926 BDL 173* 171* 6349
SP2005-1 200 731 19.49 6.24 2.26 13.6 1.24 6.32 -137 266 106 43* 40* 1062
SP2005-1 200 1484 21.06 8.029 4.41 31.2 2.70 7.08 -56.3 471 86 32* 21* 1500
SP2005-4 366 915 24.04 46.41 30.13 4.5 0.29 7.63 -139.5 8738 32 118 125 17049
SP2005-4 366 1220 19.09 20.71 12.44 <4.9 <0.41 7.01 -58.5 2232 9 55 65 4767
SP2005-4 366 1525 15.53 1.074 0.53 33.4 3.38 6.26 75.3 47 1879 17 44 4970
SP2005-4 335 1911 24.54 4.318 2.29 1.9 0.15 7.43 -164.7 No sample--insufficient yield 43 4115
SP2005-5 107 305 15.82 0.694 0.34 7.2 0.71 8.26 -96 2863 9 738 773 3833
SP2005-5 107 610 14.74 0.758 0.37 9.6 0.97 7.47 -71.7 1421 16 790 1201 4761
SP2005-5 107 915 14.76 1.123 0.56 11.1 1.12 7.03 -31.7 647 17 480 481 1953
SP2005-5 107 1220 14.13 0.705 0.35 10.3 1.00 7.37 -105 1260 17 548 565 2857
SP2005-6 0 305 17.8 11.38 6.52 5.4 0.48 8.15 -347 15738 15 2728 3461 28925
SP2005-6 0 915 15.29 0.526 0.26 10.1 0.94 8.83 -243.8 2486 17 564 825 5879
SP2005-6 0 1220 14.55 0.726 0.36 5.1 0.51 8.52 -229.5 647 20 176 1147 1430
SP2005-6 0 1525 16.6 0.351 0.17 0.0 0.00 8.82 -267.3 92 14 218 278 495
SP2005-6 0 1830 18.07 0.381 0.18 4.1 0.39 8.23 -219.5 991 17 288* 279* 2164
SP2005-6 0 2134 16.95 0.602 0.29 2.7 0.26 8.27 -225.6 680 18 124 132 1459
SP2005-6 0 2439 16.49 7.983 4.45 1.3 0.11 8.23 -351.9 328 18 58 1193 7459
SP2005-6 0 2576 No sample--insufficient yield 2.56 No sample--insufficient yield
SP2005-7 100 305 14.95 3.31 1.73 29.1 2.51 7.6 -134.9 No nutrient samples

 

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