The area is part of a residential subdivision that was developed by Henry Doelger Builders, Inc. in the late 1950’s and early 60’s. Based on the subdivision-grading plan, fills up to about 50 feet deep were placed in the area to establish pads for the residential structures. Most of the fill was placed to raise the grade through a northwest-trending topographic saddle. As fill was locally placed to the edge of the escarpment forming the southern boundary of the Mussel Rock Landslide Complex, and the deepest area fill occurs south of Westline Drive, beneath house # 37 through # 45. In a report addressing the 1962-63 ground movements, WCS (1965) concluded that an earthquake on the San Andreas Fault could cause 10 feet of sudden ground movement and potential loss of life (Jacobs Associates).
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Burns, T, Cooper, A, Carlson, P, McCulloch D. Structures of the Submerged San Andreas and San Gregorio Fault zones in the Gulf of the Farallons off San Francisco, California, from High Resolution Seismic-Reflection Data.