Unless BART to Livermore has a station near Isabel with good freeway access and abundant surface parking, it will be a gross, unconscionable waste of public funds.
With such an in-direction station, BART could serve all of Livermore and the region far better and at less than one-third the cost of Alternative 2b, endorsed by the City Council. Without that station most BART users from Livermore would drive out of direction in heavy traffic to constricted parking - and pay higher BART fares for the privilege since they are based on mileage. Many would continue crowding I-580 or Stanley Boulevard, or just skip public transit and drive instead.
An Isabel freeway intercept station, like an international airport extension, should not be subject to the Transit Oriented Development (TOD) policy due to the infeasibility of housing development. In both cases the extension serves the same purpose: Reduce urban automobile traffic.
Whether BART stays in the freeway median east from Isabel - which I far prefer - or continues along 2b, the Isabel station is critical.