25B - AGMT STORMWATER LIFT STATION

Home Browse Search

PROPOSAL N' x" A , Civic Center5tormwoterLiftStation Renovation Design 5'ervtces Tasks and Deliverables Michael Baker has reviewed the City's proposed scope of work detailed In Attachment 1 of the RFP, and has included a complete outline of the tasks and deliverable in the Scope of Services Section. Optional tasks have been identified, as described in the Suggestions or Special Concerns section below. Suggestions or Special Concerns The following optional tasks have been identified in addition to the tasks listed in the RFP. We believe these tasks will provide additional value to the City. Task N — Field Survey Due to the proposed re -grading near the Flower PS for installation of the CDS Stormwater Treatment Unit, a field survey of the area will be required to determine existing conditions. To limit the cost of this task, a small survey area was assumed. The field survey of this area can be completed by a 1 -man survey crew within one day. Field Survey of the Santa Ana PS Is not included in this task, since there are no proposed regrading activities. Task O — Potholing If utilities are discovered around the proposed CDS Stormwater Treatment Unit and storm drain, Michael Baker will (at the City's request) identify and coordinate field potholing activities to verify the vertical and horizontal location of critical utilities. The potholes will be performed using vacuum excavation technology. The potholes will be backfilled with native soil or fill sand. A permanent surface patch will be provided at each pothole location. Task P — Design of Temporary Pumping System The RFP states that the City's goal is to complete construction prior to the rainy season. Based on the preliminary schedule developed, this will not be feasible due to the listed Design Services Project Award Date (July 17, 2018), and an anticipated construction duration of 5-6 months. Construction duration will be dictated by the lead time for the pumps, which is typically 3 months from approved submittals. To mitigate the City's concerns related to the 2018 rainy season, Michael Baker can provide a design for a temporary pumping system prior to the rainy season. The temporary pumping system could be put in place by the City or an on-call Contractor. The following potential value engineering opportunities have been identified during preparation of this proposal: Provide a floor drain in the Santa Ana PS to mitigate the electrocution hazard that is present. Although the dry well will be sealed as part of Alternative SAI, the existing electrical equipment will remain below grade,. and may be subject to flooding throughout the lifespan of the pump station. A floor drain mitigates the electrical hazard by preventing ponding of water as long as the pump station is operational. A gas-tight seal will be required at the floor drain. L INTYRXLTIONAL 9 25B-31