The Contract and Contract Documents include this written Construction. Agreement between OWNER and CONTRACTOR, Advertisement for Bids,.For new builds, complete this form for the most pressure-demanding lateral and submit it with the irrigation plan. Pressure Calculation Worksheet. While picking everything out the builder also informed me that they do irrigation installation packages. ORIGINAL Site Evaluation to determine type of On-Site Sewage Facility (OSSF). a). Our Residential Irrigation Services include the design and installation of new irrigation systems and any warranty issues that may arise. An irrigation system installed at a location where one did not previously exist. Do not trust manual or automatic drain valves.