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SUNOL BOULEVARD/I-680 IMPROVEMENTS PA&FD and include the required topics for independent utility and logical termini, alternatives considered but eliminated,and estimated cost and schedule for the project. Subtask 4.3 Cultural Resources. The project area and a 0.25-mile buffer were reviewed for the presence of documented cultural resources. The Niles Canyon Transcontinental Railroad Historic District(P-01- 011624), which is on the National Register of Historic Places(NRHP), crosses Pleasanton-Sunol Road just west of the Caltrans right-of-way in the project area.No other recorded resources are present within the 0.25-mile buffer;however,prehistoric sites have been recorded within less than 1 mile. An Area of Potential Effects(APE)map would be prepared for archaeology and architectural history to include areas of disturbance. If all project components and activities remain within the existing State right-of-way, the archaeological APE would coincide with the maximum project footprint, and the architectural APE would coincide with the right-of-way line. If additional right-of-way or temporary construction, maintenance, or utility easements are needed,those areas would be included in the APE. The project area has been surveyed and analyzed for cultural resources by recent projects, including the I-680 Express Lanes from State Route 84 to Alcosta Boulevard Project(EA 04-0Q3000). An Archaeological Survey Report(ASR)would be prepared to document Native American consultation in accordance with Caltrans and California Assembly Bill 52 standards, as well as a geoarchaeological evaluation of the project corridor's potential to contain sensitive buried resources. It is anticipated that an abbreviated ASR can be prepared and incorporate the previous studies in the project area by reference. Depending on the geoarchaeological sensitivity of the project area and the maximum depths of disturbance, subsurface testing for cultural resources may be necessary. The locations and parameters of testing would be determined in coordination with Caltrans and documented in an Extended Phase 1 ()CP1)Proposal. For purposes of this scope, one day of mechanical testing is proposed. The results of the testing would be described in an Extended Phase 1 Study. Depending on the outcome of the identification and evaluation phase,a Finding of Effect document may be prepared and submitted to the Caltrans Cultural Studies Office(CSO) and State Historic Preservation Officer(SHPO). It is assumed that implementation of horizontal or vertical Environmentally Sensitive Areas(ESAs), if needed, will be sufficient for Caltrans to approve a Finding of No Adverse Effect. If nonstandard conditions are required to avoid or minimize project impacts to sensitive resources, additional reporting and consultation with the CSO and SHPO would be needed and would require additional scope. The level of effort would be determined based on study findings and coordination with Caltrans. Both Build Alternatives would modify the now-defunct rail overcrossing structure just west of the interchange to accommodate shoulder widening and new bike lanes on Pleasanton-Sunol Road. The overcrossing is listed in the Caltrans Local Agency Bridge inventory as Bridge No. 33C0104, "Castlewood Drive UP,"with the classification of Apri110,2020 12