The stream water samples are the same as collected for the NWC01 dataset.  Water samples are frozen (-3 C) in sealed polyvinyl bottles until time of processing. These water samples are thawed, subsampled at 1 mL, and analyzed for delta18O and delta2H using a Picarro L2130-i isotopic water analyzer. Samples are corrected using in-house standards calibrated to the international standard, V-SMOW.  The long-term precision for delta18O is 0.1 permil and for delta2H is 1 permil.