Section 35 

 INDIAN ISLAND, HADLOCK, WASHINGTON — U. S. NAVAL MAGAZINE AND NET DEPOT 



A55.Q1 Location of the Test Station and Test Board 



A test "board of the panel type, designated by the symbol USNII-l, 

 vas installed July 18, 19^, at the U. S. Naval Magazine and Net Efepot at 

 Indian Island, Hadlock, Washington. It was placed at the southwest 

 comer of the dock on Indian Island, I50 ft out from the shore on the 

 eastern side of the southern end of Port Townsend, on a "branch of Admiralty 

 Inlet leading southward into Washington from the Strait of Juan de Fuca 

 "between northwestern Washington and Vancouver Island. The location is 

 east of Irondale and northeast of Hadlock in Jefferson County. The test 

 "board •vreis insteilled in the vicinity of untreated piling as requested. 

 (This location appears to have "been selected "because the piling at the 

 ferry landing ie treated, and the piling at the pier is steel. ) The 

 operation of this test "board is "being continued. Tlie results have "been 

 summarized to the end of 19^7* 



Local experience with piling and dolphins indicated that aji 

 untreated tight-"barked pile would deteriorate in 10 to 12 months. It 

 was noted, howevei", that conditions have "been found to vary to a 

 great extent in various sections of the Sound. It was stated that this 

 pile wouJ-d "be good for 3 to 5 years in the Discovery Bay area, while 

 in the Qullcene Bay area, it would "be good for only 6 to 8 months. 



A35.O2 Hydropg-aphic Ifata 



The depth of water at the location where the test "board was 

 installed was 23 ft, the tidal range 7 to 10 ft, the current approximately 

 2^ knots. The temperature of the water at the time of installation was 55° 

 I". The salinity was given as 26.3 parts of chlorides as sodium chloride 

 per thousand. The pollution was reported to "be negligi"ble. 



A35 . 03 Marine Borers 



1. Teredinidae . Teredinidae ( Bankia setacea ) were very active 

 throughout the period of the test. The attack was so destructive that 

 on Novem"ber 6, 19^5/ it was requested that the panels "be removed and 

 a new series installed which would "be submerged for k months instead of 

 the previous 8-month "basis. This change was made later in the month. 



Teredinidae occiirred in 12 of the 38 control panels, ranging 

 from minute pits to em'bryonic or minute specimens. The "breeding season 

 was limited to the period beginning in the middle of March and running 



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