It took nine days for pack mules to climb the nearly 6000 feet that separate Palm Springs, California and the top of Mt. San Jacinto, where foundations were bing built for towers to support a tramway which takes people up the mountain. To speed up the process, two helicopters were brought on the job to transport the loads. Concrete used in the footings had to be of high, uniform quality, but it was impossible to transport wet ready mixed concrete to those remote sites. there was no room on the mountain side to store dry materials. A high quality bagged dry concrete mix with guaranteed strengths seemed to be the only material that could be considered.
A dock was built at the Palm Springs elevation and sacks of dry mix concrete were delivered there by truck. The sacks were transferred, seven at a time, from fork lift pallets to a sling fastened to the helicopter. Each time a helicopter landed, its sling was loaded in a matter of minutes and another trip to the mountain top was in progress. Each helicopter made about 56 trips per day (7 per hour), delivering a total of about 800 bags per day. The 800 bags were stored at construction site so that enough concrete would be available for each of the widely separated massive footings.
Hauling by helicopter proved to be so successful that, as the job progressed, the concrete mixer, water, form lumber and even the crew were flown in to the work sites on a daily basis. And instead of reverting to delivery of bulk materials for construction of the summit station, it proved to be more economical to fly the dry mix concrete to the top of the mountain for the footings and concrete slabs required there.