|
lines, symbols, and features). Each point shall include a
<br />description, elevation, and northing/easting.
<br />We will conduct field investigations to verify existing surface
<br />features (including manholes, valves, meters, pull boxes,
<br />etc.) on the topography survey and to identify the relevant
<br />features that are missing. The field review will include work
<br />necessary to inspect the project site with respect to needs for
<br />preparing the conceptual designs including ADA accessibility
<br />and compliance. Additionally, our site visit will observe
<br />existing field conditions, local drainage, and confirm the data
<br />collection and base mapping. The field reconnaissance will
<br />be an opportunity to understand constraints th #1rNhy limit the
<br />placement of onsite BMPs.
<br />TASK 2.3 ENVIRONMENTAL COMPLIANCE
<br />If required, the Alta Team will provide environmental
<br />compliance for the project. The Alta Team will prepare
<br />pertinent environmental documentation to meet CEQA and
<br />NEPA requirements. The team will submit environmental
<br />findings to Caltrans' Environmental section, subject to the
<br />approval of City Council. Technical studies relevant to the
<br />project will be prepared. Public meetings and workshops may
<br />be part of the environmental process and documentation.
<br />With the support of GHD and/or Helix, Alta will lead the
<br />preparation and conduct of public outreach and workshops
<br />required for the project.
<br />TASK 2.4 TRAFFIC ANALYSIS
<br />This includes a review and operational analysis of an
<br />intersection or corridor. Specifically, Alta will perform an
<br />existing and proposed alternatives operational conditions
<br />analysis as well as traffic signal control warrant analyses
<br />for the intersection(s). Level of service (LOS), delay, and
<br />queueing will be evaluated to assess operational impacts
<br />and provide a quantitative comparison between existing
<br />conditions and proposed alternatives.
<br />TASK 2.5 HYDROLOGY AND HYDRAULIC ANALYSIS
<br />The Alta team will prepare a Hydrology Report that follows
<br />the Orange County Hydrology Manual (October 1986
<br />Version) and identifies mitigation opportunities for water
<br />quality impacts. Using the generated drainage areas, we
<br />will utilize HydroCalc input parameters for each individual
<br />drainage area delineated (area, flow path, slope, rainfall
<br />depth, percent impervious, soil type). The HydroCalc results
<br />will be tabulated for the 85th Percentile, 24-hour storm event.
<br />The Alta team will create various GIS maps including but
<br />not limited to delineated drainage areas, land uses, and soil
<br />types. These maps will be incorporated into the Hydrology
<br />Report.
<br />TASK 2.6 BMP RECOMMENDATIONS (WATER
<br />QUALITY IMPACTS MITIGATION)
<br />A suite of Best Management Practices (BMP) options
<br />will be considered for possible implementation. Using the
<br />results from the HydroCalc model, our team will calculate
<br />the total BMP footprint/ volume required to capture the 85th
<br />percentile, 24-hour storm event for each delineated drainage
<br />area. The assumptions of the cross -sectional depths will be
<br />provided in a table (ponding depth, soil media depth, and
<br />l underdrain depth, if applicable). The Alta team will prepare
<br />Water Quality Management Plan (WQMP) in accordance
<br />with the requirements from the Orange County Technical
<br />Guidance Document (TGD), dated December 2013, prepared
<br />in response to the permit requirements from the Santa
<br />Ana Regional Water Quality Control Board. Per the TGD
<br />requirements, the project will comply with USEPA's Green
<br />Streets standards to the maximum extent practicable.
<br />The WQMP will be prepared using the County's standard
<br />template. Submittals will consist of a conceptual, pre -final,
<br />and final version of the WQMP document. All submittals are
<br />assumed to be electronic only. The (BMP) concept will be
<br />established prior to the conceptual submittal after infiltration
<br />testing has been performed and input from the City has been
<br />received.
<br />TASK 2.7 PRELIMINARY CONCEPTS AND
<br />ESTIMATES
<br />This will include considerations and analysis of multiple
<br />alternative alignments and the evaluation of traffic findings,
<br />right-of-way constraints, environmental impacts, and
<br />stakeholders' interests. Based on the aforementioned, Alta
<br />will produce a preliminary horizontal, vertical layout along
<br />with typical sections and rendering of aesthetic architectural
<br />and/or traffic elements. The developed conceptual designs
<br />for active transportation safety enhancements will be in
<br />a format that can be seamlessly presented to clients and
<br />stakeholders.
<br />Alta will prepare a Preliminary Opinion of Probable
<br />Construction Cost for the proposed alternatives. We will
<br />prepare feasibility -level itemized cost estimates for elements
<br />of the project, including quantities and unit costs with back up
<br />information as necessary. Alta maintains a compendium of
<br />recent bid results in Southern California that will be used as
<br />a basis for establishing unit prices. Our estimates will support
<br />the City's effort in seeking future grants and funding for the
<br />project.
<br />Task 2 Deliverables: Utility notification letters, utility matrix,
<br />topographic survey, feasibility report (including H&H,
<br />environmental documentation, BMP recommendations, RW
<br />impacts, traffic analysis, and draft/final concept plans and
<br />probable construction cost estimates.
<br />ALTA PLANNING, DESIGN, INC. Proposal for RFP No. 23-030 On -Call Engineering Services
<br />
|