Location | Approximate Station | El. Top of Rail | Soil Conditions at Bottom of Subway |
|---|---|---|---|
| Massachusetts Ave. | 13+85 | -6.0 | 12 ft. hard packed coarse sand |
| Cumberland Street | 21+50 | -10.9 | 11 ft. hard packed coarse sand & gravel |
| West Newton Street | 26+65 | -13.0 | 7 ft. hard packed sand & gravel |
| Garrison Street | 32+00 | -13.1 | 4 ft. hard packed coarse sand |
| B&A Railroad Tracks (Mass. Turnpike Extension) | 37+50 | -13.6 | Hard yellow clay (sand pinches out at Station 37+50±) |
| Blagden Street (& Exeter Street) | 41+30 | -10.7 | 4 ft. silt over medium blue clay & sand |
| Boylston Street (& Exeter Street) | 44+50 | -6.9 | 4 ft. peat over 8 ft. fine sand over stiff blue clay |