D. RES - Authorize Design Contract Modification No. 11 between Prince William County and Helmuth, Obata and Kassabaum, P.C., in the Amount of $514,895 for Additional Architectural Services Required for the Adult Detention Center Phase II Expansion, and Authorize the Public Works Director to Execute Future Contract Modifications, Not to Exceed 25 Percent, or $1,002,468 – Brentsville Magisterial District – Thomas Bruun - Public Works