Section k 

 SOUTHWEST HARBOE, MAINE --.U. S. COAST GUARD DEPOT. 



All-. 01 Location of Test Station ajid Teat Board 



A test "boeLrd of the panel tj^e was installed December 2, 19hh, 

 at the U. S. Coast Guard Depot at Southwest Harbor, Mt. Desert Isle, 

 ^fe-ine. The Depot is located on the southern end of Clark Point on the 

 northern side of the harhor. The test "board, designated as USNSM-l, 

 was installed under the northwest comer of a dock q.uite close to un- 

 treated wood piling. The operation of this test board continues, and 

 results of the test have been summarized to the end of 19k-'J, 



Al»-.02 H ydrofiraphic Data 



The depth of water at the location where the test board was in- 

 stalled was ik ft; the tidal range was 10.5 ftj the velocity of the 

 current was negligible. The temperature of the water at the time of 

 installation was i)-2° F. The water was reported to be clear, with 

 negligible pollution. 



All-. 03 Marine Borers 



1. Teredinidae . Teredinidae were not recorded in any of the 

 panels during the 5-year period covered by the test. 



2. Llmnoria . Limnoria were active throughout most of the test 

 period but were never particularly destructive. Limnoria occurred in- 

 small numbers on 17 of the 58 control panels but were confined to those 

 submerged during the warmer months from April through August, October, 

 and September of 19^5 > 19^6, and 19'<-7^ respectively. From these data 

 it would appear that Limnoria cease migration at this location during 

 the winter season. Limnoria were present on 55 of the 58 test panels, 

 occurring in all submerged after April 10, 19^5. -^H except k of 

 these latter panels had been submerged 8 months. The attack rated 



.ifi-am a trace to slight throughout the 5-year period covered by the test 

 except once in 19^6, when a peak rating of moderate was attained. 



AU.Olf Fouling -Agents 



1. Silt . Silt occtirred on all the panels. The deposits ranged 

 from traces to slight -or occasionally moderate on the control panels, 

 and from traces to moderate or rarely heavy on the test panels.. 



28 



