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., ~ ~ Top(jgraphic Base a) Aerial GPS and conventional surveys. iii) Generate aerial topographic mapping of a 600 foot wide strip centered on Bristol Street from 300 feet South of McFadden Ave to 300 feet North of Pine St (4,000 If ,,). Mapping will be at a scale of I" ~ 40' wirh a I-foot contour interval and include a DTM. b) Cross-Sections: Collect augmenting cross-sections of the existing street roadway of Bristol and side streets (0 be closed by cul-de-sacs at an approximate interval of 50 feet. 4. Topographic Augmentarion: Perform detailed topographic surveys ftom ptoposed R/W to Ptoposed R/W and as required by design criteria Qoins, complex existing conditions or improvement, e.tc.) 5. Record Mapping: a) Analyze retrieved record maps and assessors maps. b) Generate cenrerlines, rights-oE-way, and boundary lines from said maps using field surveyed centerline monumentation. Task C: Project Base Sheets Base sheets will be prepared in Microsrarion format using a combination of the topographic survey data collected in Task B and the previously prepared Bristol Streer Storm Drain plans, ftom McFadden Avenue to Third Street (see Exhibit 2, elsewhere in this proposal), complete with electronic utility detection survey information, which shows the horizontal and vertical locations of all of the existing utilities within the project reach (accurate to within 6-inches +/-). The Harris Team will field walk and photo-document the project limits. The number of anticipated projecr base sheets that will be prepared during this task is detailed later in the construction document phase, would be prepared ar eirher I" ~ 20' scale or I" ~ 40' scale based on rhe improvement type and complexity and will include the following: . Dimensions, labels and match lines Street centerline, stationing and street names Locarion of surface topographic fearures within rhe proposed R/W Location of surface and sub-surface utilities Existing right-of-way locations from record maps and assessor's maps . . . . Task D: Geotechnical Investigation Leighton Consulting will begin their Geotechnical Investigation by gathering and reviewing previous geotechnical studies in the project area, as obtained from the City, in-house geologic maps and various other sources. Then they will perform the following tasks: . Perform surface evaluation of onsite soil characteristics, general condition of the project area . Obtain a permit from OC Division of Environmental Health due to anticipated presence of shallow groundwater in borings. = I Harris & Associates. Bristol Corridor Widening - Phase I Page-IO-