oy tf, Bk ee Saas hatenimi gar Alarming | ea a gts ee 5nas pie i . ented, “ee a Pereanr Oneran CT.Taman CONFMDENTIAL within the domeis on three tiers that can be compartmentalized to reduce panic potential. Eighteen entryways equipped with sliding doors permit entry of the population within 10 min. Figure 43 shows a dome-type shelter design. The American Machine and Foundry Co. has estimated that the entire target-area population of Milwaukee could be sheltered in 150 dome-type shelters varying in size (according to available land sites) up to 250 ft at a cost of $65 million, or about $65 per inhabitant, exclusive of land costs.* No shelter was farther than a 30-min walk from Fig. 42 — repa 40-Person Shelter the location of any inhabitant. It is of interest to compare this figure with the estimate of $78 million required to improve Milwaukee’s road net so as to allow evacuation within 1.5 hr.” To reduce the time of walking to shelter to 20 min would require twice as many . Fee ae tesea fea shelters, or about $130 million. These costs rise markedly if enough shelters are provided to enable everyone to be within a 15-min walk; four times as many shelters would be required, a cost of $260 million. Admittedly the shelters could be smaller and hence less expensive (if one planned ahead to this extent), but tending to balancethis factor would be increased land costs as the supply of less expensive sites became exhausted. It should be pointed out that this type of shelter does not exist even in prototype and has never been exposed to tests, although it is scheduled for testing in the 1957 Nevada series. The Chief of Protective Construction Branch, Office of Chief of Engineers, us Army, testifying before a House Committee, questioned the cost estimates and had reservations about the available air supply and the ability of the structure to maintain a tolerable heat level without expensive refrigeration equipment.” Figure 44 shows anotherrelatively inexpensive public shelter designed to resist 22-psi overpressures. Essentially a buried corrugated metal arch erected on a concrete slab,it should cost $40 to $60 per occupant, allowing each 10 ft of shelter space.” *rcpa has estimated the cost of this shelter at $100 per occupant. 60 ORO-R-17 (App B) CONTFTDENTLAL