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The RCS at each site is housed in a prefabricated trailer that is approximately nine feet wide, eight feet tall and 28 feet long. At the Foothill tank site, the RCS unit was placed near the existing pump station within the current parking lot. At the Sycamore tank site, the RCS unit was placed on an existing roadway turn-around (see Attachment 2). The systems were anticipated to be installed in late fall 2021 but due to the COVID-19 pandemic and supply chain issues, fabrication and delivery were delayed until spring 2022. The systems were finally installed and ready for testing in July 2022. After successful operational testing and monitoring by the vendor and designer, along with City staff, the RCS units were placed in service and have been in operation since fall 2022. Eight change orders for a total of $76,317 were issued during the construction of the project. The additional work under these change orders is described below: • Change Order No. 1 modified the mesh size of the chain link fencing from half an inch to one inch. The one-inch mesh is more commercially available and still meets the anti-climb requirement for fencing. A credit of $30,000 to the City was made for this change. • Change Order No. 2 added additional flexible connections and UV shields at the trailers' pipe support interfaces to allow for some vertical and horizontal movement. The total cost for this change was $988. • Change Order No. 3 lowered the joint trench depth at the Sycamore tank site, due to conflicts with other existing utilities. It was necessary to install the conduits for the chemical feed system at a depth of approximately seven-and-half feet. This deeper-than-planned excavation, in addition to deeper digging, required engineered shoring and deeper vault sections. The total cost for this change was $39,070. • Change Order No. 4 installed communication conduit and wires from the pump station to the radio antenna replacing a failed direct buried cable at the Foothill tank site. The total cost for these changes was $7,363. • Change Order No. 5 added prefabricated steps and handrail at both of the RCS trailers at the main access doors to provide OSHA-compliant access. After the installation of the trailers, the vertical drop at the doorway exceeded allowable distances. The total cost for this change was $3,508. • Change Order No. 6 modified the new electrical equipment main panel to accommodate a 4-wire setup requested by PG&E during the pre-installation inspection. The project specified a 3-wire setup for the main switchboard (MSB). The total cost for this change was $8,536. • Change Order No. 7 provided temporary power to facilitate RCS startup and testing during the summer when nitrification is observed. Temporary power was required to run the system while waiting for PG&E to complete energizing the new service. The total cost for this change was $4,496. • Change Order No. 8 was the final change order written on the project and included several issues that arose during construction and included: Adding chain supports for the chemical tubing in the tank access hatches, patching the rebar at the Sycamore hatch, adding installation of fittings at the Foothill tank's Page 3 of 4