A. Corporation Yard – This project component shall consist of the following: 1) Maintenance & Shop Building – The District envisions a pre-engineered building (PEB) for fleet repair and maintenance in lieu of a custom designed structure (See Attachment 4 for a sample PEB). The PEB shall have the following features: a) Maintenance bays with adequate space and proper lighting and ventilation. b) Office space, conference room, lunchroom, and locker room. c) Dedicated storage rooms for spare parts and other critical items. d) Hazardous waste storage room for used or new oils and other chemicals. 2) Graveled or Paved Yard – The yard shall consist of paved or graveled sections as appropriate. The paved area shall provide adequate turning radius for heavyduty vehicles to enter and exit without the need to backup. Some District vehicles are 30’ to 39’ long and capable of towing utility trailers. The yard shall incorporate the following: a) A separate covered parking structure for storage of large equipment, such as towable gensets and pumps. b) Concrete wash pad with oil separator. c) Vac truck dump pad with decant trench or catch basin and drainage system. The pad shall incorporate a screenings trap and storage bay. d) Potable and non-potable water filling station. e) Dual fuel storage tanks (diesel and gasoline) with double containment and fueling station. f) Staff parking lot with Electric Vehicle (EV) charging stations 3) Access Road and Bridge – The proposed site is approximately 1,400 ft from the treatment plant. The selected consultant shall evaluate the feasibility of the two alternatives for the access road described below (See Attachment 2). The preferred alternative is Option 1. However, the selected consultant shall prepare plans and specifications for Option 2 and include in the bidding documents as an alternate bid should Option 1 turn out to be cost prohibitive. a) Option 1 – The District owns a strip of land west of Miller Creek with a flood protection levee to protect the adjacent field during high tides and major storm events. Historically, staff have observed overtopping at the lowest section of the levee near the parking lot when high tide coincides with a prolonged major storm event. In addition, multiple sections of the levee are not properly engineered and consist of chunks of asphalt, oversized boulders, and construction debris. This option would require reconstruction of the levee into a properly engineered paved roadway from the existing Reclamation Parking Lot to the proposed site. The access road shall have the following features: i. Multi-pathway roadway section for two-way vehicular traffic and pedestrian path. ii. Drainage “duckbill” culverts – The adjacent field floods during major storm events and could remain flooded for extended periods until the flow in the creek subsides and allow the field to drain though an existing upstream gravity culvert or the undersized stormwater pump station. iii. Miller Creek Bridge Crossing – The bridge shall be H-20 traffic rated with sufficient width for two-way vehicular traffic and pedestrian path. b) Option 2 – This option would require the widening of the existing Miller Creek bridge and reconstruction of a new roadway east of the creek. The design criteria for the widened bridge and new roadway are similar with Option 1. A study conducted by the District in 2020 indicated that the existing bridge meets AASHTO H-20 design criteria.
