In the B satellite where LH departs you can use the SEN lounge if you are LH SEN. All other elite and C pax are sent to the SK lounge next door. Both are very nice.
The UA RCC is not accessible if you have a BP on LH at EWR. The contract lounge used by VS, SQ and LO is nice and landside, but out of bounds for *G with a LH BP.
The loungeguide has a complete listing of lounges at EWR under N:
http://www.loungeguide.net/wiki/u/Category:USA