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Between 1954 and 1974 many USA cities were ringed by Nike missile sites. These were ground-to-air missiles, intended to protect against attack by enemy bombers. The first versions of the missiles were armed with high explosive shrapnel warheads, so they could bring down the target even with a near miss. Later versions of the missiles could be armed with 30 Kton nuclear warheads.
The missile facility near San Ramon was designed for the Ajax missiles — becoming obsolete when the long-range Hercules missiles were established at SF-31, just outside of the Lake Chabot/Castro Valley area in June 1959.
As you approach the trailhead parking area you will pass the remains of SF-25L, some Nike-era buildings being used as the Las Trampas park office. The cache is located at "SF-25C Rocky Ridge", elevation 1978 feet. The IFC site is now covered with microwave relay towers.
Both stages of this cache are located within EBMUD property and as such you will be required to obtain a trail permit from them.
Fgntr 1: frr gvgyr.
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Coordinates are in the WGS84 datum