A brief ground-water reconnaissance, Point Reyes National Seashore, Muddy Hollow Drainage : Revised

McClelland, E

In response to an emergency telephoned request on April 26, 1963* by Mr. Cole, National Park Service and a subsequent written request of May 2, 1963, by L. J. Diedrich, National Park Service, the Geological Survey conducted a brief 3 -day field reconnaissance of one small valley of the proposed Point Reyes National Seashore to provide information on the ground -water supply in that immediate area. The investigation also included a search of Geological Survey and State of California, Department of Water Resources files in Sacramento for any previously collected data. Of the 3 days in the Point Reyes area, about one half the time was spent in field inspection of the area and the other half was spent in contacting other sources of information. These included a conference with Mr. Alan J. Galloway concerning the geology of the area, examination of California Public Utility Commission records, and Marin County Sanitation Department files concerning Drakes Bay Estates, and discussion with representatives of the Petaluma Pump and Well Drilling Co., who constructed two public-supply wells for Drakes Bay Estates. The following presents the Information obtained from the above and the conclusions of E. J. McClelland, Fred Kunkel, and W. L. Burnham about the ground -water supply in the 8rea . The conclusions are brief and because there has been insufficient time for collection of detailed data they necessarily are preliminary and may be subject to revision when more detailed information is available.