(how) d) accept work performed by jdb & sons construction inc., for contract no. wd-2779, college hill learning garden; approve modification no. 1 (final), increasing the contract amount by $57,252, for a total contract amount of $580,652, with a time extension of 119 consecutive calendar days (approximately four months), for a total contract duration of 189 consecutive calendar days (approximately six months); and authorize final payment to the contractor. (how) e) accept work performed by shimmick construction company, inc., for contract no. ww-490, oceanside water pollution control plant 620 digesters sbr tpad conversion and facility improvements; approve modification no. 11 (final), increasing the contract amount by $158,021, for a total contract amount of $19,034,533, and with a time extension of 167 consecutive calendar days (approximately five months), for a total contract duration of 1337 consecutive calendar days (approximately three years, eight months); and authorize final payment to the contractor. (how) f) authorize the general manager to negotiate an