Wootton, K.P. Berg, W. Borland, M. Brill, A.R. Byrd, J.M. Chitra, S. Collins, J.T. Dooling, J.C. Edwards, J.N. Erwin, L. Fystro, G.I. Grabinski, T. Henry, M.J. Heyeck, E.E. Hoyt, J.E. Keane, R.T. Lee, S.H. Lenner, J. Lobach, I. Lumpkin, A.H. Puttkammer, A. Sajaev, V. Sereno, N. Sun, Y. Wang, J. Wang, S.G. Zholents, A. JACoW Publishing Geneva, Switzerland 2673-5350 978-3-95450-236-3 10.18429/JACoW-IBIC2023-WEP017 English 368-372 electron MMI linac beam-transport photon Contribution to a conference proceedings 2023 2023-12 https://doi.org/10.18429/JACoW-IBIC2023-WEP017 https://jacow.org/ibic2023/papers/wep017.pdf The Linac Extension Area has been developed into a beamline area for testing accelerator components and techniques. Beginning commissioning activities in February 2023, we have delivered the first electron beam to the Linac Extension Area at the Advanced Photon Source at 425 MeV. In the present work, we outline the stages of re-commissioning the electron beamline. We summarise measurements of the electron beam transport through the accelerator. We outline scenarios used to verify the adequacy of radiation shielding of the beamline, and measured shielding performance.