Section kl 

 SAW FRAiroiSCO, CALIFORNIA — SAN FRAHCISCO MYAL SHIPYAED 



Alj.1.01 Location of the Test Station suid Test Board 



A panel- type test board was Installed on July 5; 19^» at 

 Hunter's Point, San Francisco, California, at the station formerly 

 known as the U. S. Naval Itrydocks, but now designated the U. S. Naval 

 Shipyard, When an attempt was made to remove the first panels on August 

 12, it was discovered that the board was missing. A new one was at 

 once installed, and the test is considered to have begun on the 

 last-named date. 



The board was installed at the end of the second pier east of 

 Drydock No. 5 between berths 57 and 58. This pier, a timber structure, 

 extends l|-00 ft into San Francisco Bay. This test board was designated 

 by the symbol USNMI-li-. The operation of this test 'board is being 

 continued, and the results of the test have been siammarized to the end 

 of 19^7. 



The destructive attacks oy I'eredlnidae in the San Francisco Bay- 

 region have long been of major concern, and a number of intensive 

 studies of the situation. have been made and published. The destructiveness 

 of Teredlnldae Is well illustrated in figure 11, which shows axi untreated 

 Ponderosa pine pile from the storage boom dolphin at Hunter's Point, 

 which was driven on February 8, 19^3* and broke on June 18, 19^3« 



AlH . 02 Bydrographlc Ifata 



The depth of water where the test board was Installed was 26 ft 

 at mean low water. The tidal range was 9 ft, with a mean range of 6 ft. 

 The current velocity was given as 2.2 knots (a,t time of tropic currents). 

 The temperature of the water at the time of the original installation 

 in July was 6h° F. Two samples of water from the Bay, taken 25 ft 

 below mean low water, were submitted to the Industrial Laboratory for 

 analysis of salinity in 1946. One taken at SubBase (end of Pier B), 

 2 hours after low tide on March 20, showed a salinity (expressed as 

 sodium chloride) of 23.1 parts per thousand. The second, taken at 

 SubBase (head of Pier B), at high tide on March 21, showed a salinity 

 (expressed as sodium chloride) of 22.2 parts per thousand. The Coast 

 and Geodetic Survey Publication IW-2, November 19^1, gives the following 

 information on San Francisco Bay salinity. 



182 



