Section kO 

 VALLEJO, CALIFORNIA — MAEE ISLAND NAVAL SHIECAED 



a40.01 Location of the Test Station and Test Boards 



Three test "boards of the panel type were Installed June 20 and 

 21, 19^, In different locations at the Mare Island Naval Shlpy;ard, 

 Vgillejo, California. Jfere Island is located at the eastern side of 

 San Pablo Bay, and the piers where the test hoards are located are 

 in Mare Island Strait, sometimes called the Napa Elver, "between Mare 

 Island and Yallejo. The first of these test hoards, designated by 

 the symbol USNMI-l, is located near the north end of the Shipyard on 

 the south side of the east end of Shipbuilding Ways No. 8. The second, 

 designated by the symbol USNMI-2, is located near the south end of 

 the industrial yard, on the north side of Finger Pier No. 21 about 

 50 ft west of the eastern end. The third, designated by the symbol 

 tJSHMI-5, is located near the southeastern end of Mare Island, about 

 15 ft from the southeastern corner of the Naval Anmrunition Depot 

 Pier, at Berth 54-E. 



The test board at Finger Pier No. 21, which was lost sometime after 

 the panels were removed, was replaced by others on September 21, 19Mi-; 

 a new board was installed about 5 ft inboard from the old location on 

 December 23. On October 25, 19^5 it was reported that the test 

 board at Finger Pier No. 21 was lost because of ship movements or 

 tides, and that the board at the Naval Aamunition Depot Pier was 

 swept under this pier and was fouled, so that it could not be withdrawn 

 until favorable low tides would permit dismantling. Both boards 

 were replaced by new boards at the same locations on December 6, 19l»-5. 

 The operation of these test boards is being continued. The results 

 of these tests have been summarized to the end of 191*7. 



Al|-0.02 HydrograTihic Data 



1. USHMI-1 (Shi-pbuilding Ways No. 8 ). The depth of water 

 where this test board was Installed was 9 ft below mean low water. It 

 was installed with its lower end at a depth of 7 ft and its top at a 

 depth of one ft below mean low water. The usual rsmge of tide was 6.2 

 ft from mean low water to meem high water. The extreme high water 

 (Febmary 13, 1938) was 9.5 ft above mean low water. The extreme low 

 water was 2.6 ft below mean low water, emd the extreme indicated variation 

 in the water was 12.1 ft. The velocity of the current in Mare Island Strait 



171* 



