Older Views from Google Earth - Colin Jung posted the following (in part) on ICON:

Recent diggin' in San Francisco that uncovered the 2 and 1/2 CD 785's was all accomplished within the Transbay Transit Project Area, the bulk of which extends from Beale Street to 2nd Street between Mission Street and Howard Street. See construction area map. http://transbaycenter.org/construction-updates/construction-activity-map Excavation of the project area actually began in January 2012 and construction of the underground foundation started in January 2013. As excavation has proceeded, numerous artifacts have been recovered by project archaeologists who have created a public exhibition that may be viewed in San Francisco until the end of June 2013. Please note that there are numerous, different active construction sites in this south of Mission Street area. Don't get the sites confused.

The first known glassworks in California was Baker and Cutting, which started operations in 1859 on Beale Street between Mission and Howard Streets, whether that glassworks site intersected the Transbay Transit Project Area is not known. According to collector Dwayne Anthony, he has personally spoken to a bottle digger who has dug the Baker and Cutting site (years ago) and found shards of the California threadless sleeves, CD 1010. If the B&C glassworks site was within the Project Area on the west side of Beale Street, past and ongoing excavation and construction has obliterated the site. Other redevelopment projects with underground structures have occurred on this segment of Beale Street and these projects would have also obliterated the remnants of B&C if the property boundaries intersected.

One and a half CD 785's (in dark olive green glass) were recovered about 19 feet below existing street grade next to the easterly Beale Street sidewalk nearer to the Howard Street side. In this area there is a general lack of broken glass and a blackish sandy soil. At times there is a strong smell of tar emanating from the ground. The area is part of a larger area historically known as the "Tar Flats". The digger of this insulator feels it was lucky happenstance for him to find it as the ground surface conditions are continually changing from the ongoing construction activities. Curiously, the insulator was discovered on a second visit to the local area where the digger had previously found shards of a very old pickle jar.

The other CD 785 in dark olive green glass and a base shard of a fourth CD 785 in dark orange amber glass were recovered a short distance away from the first find under Beale Street. Note that Beale Street is a "street bridge" where it intersects the Transbay Transit Project Area. Additional project excavation has occurred in the area since the 2 and 1/2 finds have been reported. The digger has continued to work the site since the finds, but has made no new discoveries. Both the digger and this author believe his finds represent a single telegraph pole site, rather than, remnants of the actual glassworks site.