he Contractor must include in the Draft Book the General Arrangement of the Sanitary Drainage Network of the Buildings and/or Facilities up to the point where its treatment will be carried out, as well as the description and all the design parameters of the associated Civil Works. to the Sanitary Drainage System from the Buildings and/or Facilities to the Site where its treatment will be carried out, in accordance with the Criterion established in Section 7.3.8 “Design Criteria for the Chemical and Environmental Protection Area.The hydraulic design of the network of the Sanitary Drainage System must comply with the Criterion based on the consideration of the number of movable units that discharge into the Network, likewise the pipe material may be high-density polyethylene (HDPE). PVC, Polypropylene or concrete, the diameter must not be less than 20 cm (the inner diameter must be smooth), as established in section 7.3.7.18 "Minimum Design Requirements".The Sanitary Drainage Network System in general must be made up of the following elements: