Table 1: Summary of Geochemical Data

Well Depth** Land Use T pH Spec Cond DO Ca2+ Mg2+ Na+ K+ Cl- SO42- NO3- HCO3- d15N d18O d13C
  feet code C   mS/cm % Sat. mmol mmol mmol mmol mmol mmol mmol mmol
GC1 533 AG/LD 10.7 5.6 205.0 95 0.442 0.274 0.409 0.025 0.401 0.335 0.464 0.362 6.0, 6.2* 6.1, 1.6* NA
GC3 523 AG/LD 10.8 5.5 246.0 88 0.556 0.336 0.465 0.028 0.449 0.413 0.571 0.393 5.9 3.3 NA
LH1 535 LD 11.1 4.9 47.9 99 0.052 0.037 0.209 0.014 0.186 0.009 0.161 0.099 5.6, 5.5^ 7.0 NA
WA3 253 LD 11.2 4.8 32.7 100 0.040 0.022 0.165 0.018 0.141 0.006 0.063 0.119 4.3, 4.3^ 3..7 NA
MR2 409 VA HOSP 12.0 6.1 258.0 81 0.599 0.285 0.683 0.036 0.629 0.165 0.529 0.965 6.8 NA -18.91, -18.81^
WS2 226 MD/INT 11.3 5.7 210.0 79 0.387 0.296 0.565 0.036 0.581 0.127 0.482 0.636 7.1 2.8, 3.3^ -19.72
RU1 604 MD 11.3 5.8 119.0 58 0.227 0.160 0.300 0.024 0.234 0.087 0.229 0.562 6.2 0.98, 3.6^ -19.0
SS3 412 MD/COM 11.2 4.8 161.4 95 0.279 0.193 0.418 0.035 0.384 0.195 0.514 0.181 5.7 1.6 NA
CS2 402 MD/COM 11.9 5.3 183.4 96 0.269 0.197 0.570 0.033 0.584 0.119 0.614 0.185 6.4, 6.4* 0.2, 2.5^ 4.0*, 2.3^ NA
RS2 504 MD 12.1 6 173.8 93 0.399 0.154 0.413 0.027 0.440 0.121 0.439 0.458 6.1, 6.5^ 2.3 -21.63, -21.57*
DG1 354 MD 11.6 6.05 267.0 58 0.634 0.362 0.709 0.101 0.711 0.172 0.346 1.170 6.0 3.1 -17.2
A 102 MD/GC 14.0 5.7 270.0 84 0.424 0.304 0.783 0.054 0.733 0.323 0.664 0.325 6.5, 6.5* 2.6, 3.3* NA
B 132 MD/SCH 15.0 5.2 203.0 85 0.349 0.169 0.565 0.079 0.511 0.226 0.507 0.220 6.2 1.9 -13.8
C 168 NUR 17.0 5.3 122.0 81 0.250 0.144 0.344 0.031 0.378 0.160 0.079 0.237 2.9, 3.0^ 11.9 -20.1
D 13 LD 15.0 4.8 155.0 87 0.180 0.148 0.609 0.041 0.652 0.159 0.179 0.110 6.3 4.1 NA
E 105 MD/GC 14.0 5.6 249.0 72 0.449 0.333 0.739 0.043 0.674 0.235 0.446 0.592 6.2 NA -20.1
F 123 MD/COM 15.0 5.1 395.0 55 0.724 0.321 1.305 0.125 0.700 0.559 1.350 0.328 7.1 2.5 -16.79, -16.92^
G 70 MD/UTIL 15.1 4.6 333.0 70 0.474 0.181 1.522 0.084 1.594 0.259 0.621 0.000 7.1 2.1 -17.6
H 139 LF 16.0 5.6 1711.0 14 1.497 1.029 7.829 0.102 11.425 0.516 1.679 1.161 3.2 0.1, -0.6^ -17.7
I 42 MD 14.0 5.3 543.0 6 0.524 0.383 2.653 0.100 3.255 0.178 0.600 0.486 8.4 2.1 -20.5
J 75 AG 14.0 5.6 368.0 94 1.073 0.432 0.313 0.125 0.621 0.958 0.814 0.135 4.6, 4.6* 4.7* 3.3, 2.6* NA
K NA INT 12.5 5.3 208.0 90 0.384 0.247 NA NA 0.697 0.221 0.447 0.380 6.7, 6.7^ 1.5 -21.0

**Depth to top of screen. Land use codes: LD = low density residential (<1 unit/acre); MD = medium density residential (2-4 units/acre); INT = intermediate density residential (5-10 units/acre); AG = agricultural; HOSP = Hospital; GC = golf course; COM = commercial; SCH = school; UTIL = utilities; LF = landfill; NUR = nursing home. * = Anonymous replicate; ^ = EIL replicate