(a) 15,600,000 cubic yards of material to be displaced to form a 
trench on the bottom of the Bay to receive the tube sections. The 
"binocular-shapred" cross-section of a tube is about 24 feet by 48 feet 
and contains two 17-foot diameter cores. 
(b) Fabrication and placement of a ventilation structure on the 
San Francisco end. This structure is 68 feet wide, 122 feet long, and 
108 feet high. It will contain 10,000 tons of structural steel and 27,800 
tons of concrete. 
(c) 80,000 cubic yards of rock dike at the eastern end of the tube. 
(d) Temporary electrical facilities. 
(e) Imbedded electricail facilities. 
(£) 300,000 cubic yards of concrete (the tube consists of 3/8 inch 
thick steel plate skin and 27 inches of reinforced concrete). 
Not included in the above is finish construction, track laying, and 2.8 
miles of approaches costing about $90,000,000. 
If all costs of items (a) through (f) were charged to the concrete, 
the cost per cubic yard would approach $300. On the other hand, the 
fabrication cost of an average BART tube section, including the steel 
shell, reinforcing steel, and all associated work, was approximately 
$120 per cubic yard. 
Lack of space for setting up a plant to furnish the 300,000 cubic 
yards of concrete for BART, led the contractor to buy the concrete from 
Rhodes & Jamieson, Ltd., a major supplier in the Bay area. Rhodes and 
Jamieson set up a special batch plant, for the project, one of the largest 
in Northern California, and delivered the concrete a distance of 1.5 miles 
in transit trucks. The plant had a 11%-yard Rex mixer, a capacity of 
250 cubic yards per hour, and was equipped with an electronic console 
with 24 pre-set mix designs. 
The plant mixed 5 cubic yards of cement and aggregates, while at 
the same time held another 5 cubic yards on the scales. The plant had 
400 tons of overhead aggregated storage in eight compartments and two 
overhead cement silos with 500 bbls each (376 lbs per bbl). Concrete 
placement was estimated to reach 3,000 cubic yards per week. 
Quality Control in Production 
Quality control in the production of portland cement concrete not 
only requires a sound set of specifications, but also, it requires the 
active participation of knwoledgeable inspectors. The inspectors must 
be capable of sampling aggregates, cements, and fresh concrete and per- 
forming necessary tests to assure that the final product meets all 
specifications. 
