We present CARMA observations of the three northern unconfirmed galaxy clusters discovered by the PLANCK satellite. We confirm the existence of two massive clusters (PLCKESZ G115.71+17.52 and PLCKESZ G121.11+57.01) at high significance. For these clusters, we present refined centroid locations from the 31 GHz CARMA data, as well as mass estimates obtained from a joint analysis of CARMA and PLANCK data. We do not detect the third candidate, PLCKESZ G189.84-37.24, and place an upper limit on its mass of M500 < 3.2 X 10^(14) M_SUN at 68% confidence. Considering our data and the characteristics of the PLANCK Early Release SZ Catalog, we conclude that this object is likely to be a cold-core object in the plane of our Galaxy. As a result, we estimate the purity of the ESZ Catalog to be greater than 99.5%.
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