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HomeMy WebLinkAbout20010405 Ver 1_Other Agency Comments_200106245 i Subsequently, it is recommended that an additional survey for SAV be conducted earlier in the 2001 season. It is anticipated that surveys conducted in June or early July will detect horned pondweed if it is still present within the system. Please contact me at 733-1203 if you have any questions or need additional information. Cc: File: B-2531 RESULTS Results of the August 2000 survey are included in the following table. The results of the August 1994 and June 1996 surveys are also included in the table for comparison. Sample locations depicted in Figure 1. Two SAV species were identified during the course of the survey: A. Tapegrass (Vallisneria americana) B. Horned pondweed (Zannichellia palustris) The tapegrass averaged 1-2 feet in height, while the horned pondweed was no more than eight to ten inches high. During the August 2000 survey, water salinity was 2.8 ppt and secchi depth was four feet. The June 1996 survey identified coontail (Ceratophyllum demersum) in addition to the two species above, but only in Lawson Creek. No SAV's were found at the Lawson Creek site (site 1) during the August 2000 survey at the bridge location, nor were any SAV's seen within 100 feet up or down the shoreline from the bridge. The August 1994 survey identified tapegrass and either coontail or horned pondweed, which were misidentified as eelgrass (Zostera sp.) and milfoil (Myriophyllum sp.). Areal. coverage of the SAV's, as determined from the 1996 and 2000 surveys, is presented in Table 1. Areal coverage in 1994 was 2.26 ac (minus Scott's Creek data), in 1996 coverage was 2.02 ac, and in 2000 coverage was 0.82 ac. The results of the 2000 survey reveal that there is a 1.2 ac (0.49 ha) reduction in SAV coverage from the 1996 survey. However, the 2000 survey did indicate that the tapegrass community remains relatively stable, with a slight increase in areal coverage. Possible explanations for the reduction in overall SAV coverage include: • affects from project construction, • negative affects from recent/frequent hurricane activity, (habitat displacement from the affects of high water scouring, or sedimentation), • reduced water clarity, and/or, • the horned pondweed may have naturally experienced a late season decline. It should be noted that horned pondweed, in the vicinity of New Bem, was observed to be extremely sparse or absent. It was observed to be abundant throughout the system in 1996. J 2K1 .......................................... 0 ................................... 0 .................... - .......................................... 0.8 ................................................. ...... ... . - 2K2 ........................................ ,........ 0 ............................... ,... 75 .................... B . ......... ,.............................. . . . .. 3.0 ........ . ... .................................. 6-8 2K3 ? .................. ............................... 0 .................................. 0 .................... . - i .........:................................ .......... .................................h...... . 8.0 ................... .................................. _ 2K4 ND 0 - e . ...................................... ...... 10.0 ? a .................................. - 2L1 .........................:........................ 0 .................................. .25 .................... B .......................................... 1.2 ............ 4-6 2L2 ...................................:.... p......... 0 ..............................F.... 75 ................... 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NO ..................... 100 ....... ..................................... A&B .................................... 2.5 ............................. . 12-24 . . C .................d........... NO ..................... , 19 .......p................................ ,.... A&B .................. . . ..... 3.0 .......... ......... ....................... 12-24 2C35 ....................... ............................. ND ..................... 100 ............................................. . ................ A&B .................................... .... .... 3.0 ...,................................... 12-24 . . . . .. 2U6 .......... .......................y........... NO ..................... 38 .......,................................,.... A&B ..................................... 3.0 .. ?. ... .. .. .. . ................................... 12-24 2C'7 . .......... . ND ............... .. .. .. 50 .................................. ... . . . . . 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A&B ..................................... 2.0 ....... ° ...........12-24 ............. . 2E'3 ....................................... {.................................. € 100 's .... ................................,...... B ............ . ............................. 2: ................... ................... .......... j 1 . 2E'4 ................................ .................. NO ..................... 100 ............................................. ... .................... B .................................. .. ..p................. ............. 2.5 ............... .. . ........ .......... ..... ........ .. 12 2E'5 ............... .........................a............. ND ..................... 75 ..... ................................ ,...... B .................. ... .. .. . .. .................. 3.0 . ...............12................. .......... ND 69 . . . B 3.5 12 3A1 0 0 .......................................................................................................... 3A2 0 100 A&B ....................................... ................................:.................................... 3A3 0 38 ? B : ......................................................................... ................................. 3A4 NO 19 B . ........................................................................................ 3A5 ND 0 - ...................... ........ ............... ......... ........ ............ 0.7 .................... :............... 3.0 ............................... : .... 5:0 6.0 ..................................... 8.0 - ................................... 12-24 ...... ..,12 ................. 12 .................................. _ 3B1 ........... 0 ................... ......... 0 - . 0.7 3B2 ............................. ...................... ............................:........ ........:.........................:............... 81 81 B ............................:................................y...... ............................:...... 2.5 .................................. 12 3B3 .......... 8 ................... ................. 00 ......... ......................:....... B ........ ......................... ....... •:............... ........ ... ............. ...... 3.5 . . 2 3B4 :...... 38 ....... ? ................. ..... .... - ............... ................. ...... ....,...... g :? .................................. - 3B5 19 0 ................................ - ........................ ... . ........... 10.0 , - - 10.0 3C1 ........... 100 ......... 0 .................. . ......•---........ . - 0.8 : _ 3C2 .................. ............ 5 ........................................ ............... . ..... . .............. 31 B ................................... ...... .... ----.....--•- ........................ ....... --. 2.5 ................................. 12-18 0 ........... 6 ................... ....... ......... 0 .................. ...................•-..... .... .... ... ......:....... .................... .. 4.0 ........... ..............3C4.... ....... 6 0 .. ............................ ........................ .................................... 7.0 ................................. C5.--. ......... ...................... ... .... 0 .............. .....................0 .................. ............................................. ..............-.. ........... ............................. 00 1 .1 :.............................................. y 5A1 0 < 0 - .......... . .... 1.0 - .................................................................................... ..................................... 5A2 0 . .............................. 0 ......... ................. . . - 2.5 - 5A3 0 0 - 3.0 - 5B1 0 ........................................ ..................................... .. 0 .............................. - .. ........................................... 1.0 - . ............................................ ........................................ 5B2 0 . 0 - 2.5 - > ........................................ .......... :. 5B3 0 ..i .............................. 0 ............................................... - ....................................... ... .......................................... . 3.5 - 5C1 0 0 - 1.0 - ........................................ .................................. .................................... . 5C2 0 .......... ................................................................... ..: . . .:. ............................... i........................... ................ - ..............................:........................................... . .............................................Y........................................ 3.0 - :.................................................................................... 5C3 0 0 - 3.0 - SD1 0 ........................................ .............................. ....... .. . 0 .............................. - ............................................. 1.0 - . ...................................................................................... 5D2 0 ................. . 0 ............................ - 3.0 - ?....... 5D3 0 0 - 3.5 - 5E1 0 0 ........................................ ......................... .............. ......... - 1.0 - ......................................... .........................................>........................................ 5E2 0 ............................................................................... . 0 ............................:. - :........................................... 3.0 - ..................................................................................... 5E3 0 0 - 3.5 - SFl 0 ........................................ ...................................... . . 0 .............................. - . ........................................... 1.0 - ........................................ . ............................................ 5F2 0 ........................................ .......... .i. 0 .............................. - . ..............----............------... 3.0 - ....................................... ............................ SF3 0 0 . - 3.0 - 5G1 0 ........................................ ...................................... 0 . ........................... - ....................................... 1.0 - ........ . ..... . ............................ ?....................................... 5G2 0 ...... ........................................................................ . 0 .............................. - ............................................ . 3.0 - .................................................................................... SG3 0 0 - 3.0 - ND denotes Not Determined REFERENCES Fassett, N.C., 1975. A Manual of Aquatic Plants. University of Wisconsin Press, Madison, Wi. Godfrey, R.K., and J.W. Wooten, 1979. Aquatic and Wetland Plants of the Southeastern United States. University of Georgia Press, Athens, Ga,