20090356 Ver 1_More Info Received_20090618

TRAN,$ITE CONSULTING
EPA
ENGINEERS, INCORPORATED
ENGINEERS • PLANNERS • CEI
June 18, 2009
Ms. Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard
Raleigh, NC 27604
Attn.: Ms. Lauren Witherspoon
Re: DWQ Project # 2009-0356
The Lynden Centre at Crabtree, Raleigh, NC
UT to Crabtree Creek [030402, 27-33-(10), C, NSW]
Dear Ladies,
r T.;
I DO
JUN 18 2009
DENR . WATER QUALITY
kPiETL.AyJS AND STORMWATER BRANCH
Per your letter dated May 29, 2009, TranSite Consulting Engineers, Inc. (TCE, Inc.) is pleased to submit the
following responses:
Additional Information Requested:
1. Please show existing and proposed one foot topographic lines for the entire site. The DWQ cannot
evaluate the design of the proposed scour holes unless this information is provided. The existing and
proposed one-foot contours with elevations have been added to the Proposed Buffer Impacts diagram on
the Buffer Impacts Plan as requested showing the proposed grading for the site and Preformed Scour
Holes.
We trust that you will find this information sufficient for you to proceed with the review and approval of our
variance request. Should you have any questions or need any additional information please do not hesitate to
contact us at your convenience.
Sincerely,
TranSite Consulting Engineers, Inc.
Douglas B. Saunders, PE
Principal
3516 Bush Street, Suite 101, Raleigh, NC 27609 • Phone [phone] - Fax [phone]
Page 1 of 1
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BUFFER IMPACTS SUMMARY (SF) C7 ~ ~
~3 Z~~~
"cC I O ~~J(v
TOTAL I M PACTS ~ ~ U
ZONE 1 IMPACTS ZONE 2 IMPACTS (ZONES 1& 2) o m X= z
f,.~~ e I ........v. 0 =
....a r ww . "a /.i~ Q ~m~C7
EXISTING 4564 4026 8590 ~ p 0 p Lu
I ~aZQ
j
ADDITIONAL PROPOSED 1216 1106 2322 Q
¢ , _ ~ N ~ N
. W._._ ~~~tiJ~
~m...._..~_ _mmm . _ _ . ~ ~ ~.,.,.u.. y~_. TOTAL PROPOSED & 5780 5132 10912
EXISTING

v~ ~ 6 G~Nt>. z~ V"
nn. ~v.19 T_.tACiAN t ~,~5 . . 1 f i PROPOSED REMOVE 1991 343 2334
f ~ ~ ~ /
\y' ~ ~ i . ~ , EXISTING IMPERVIOUS ~ o °
243 d 1~ 9 Z N W I L ~ M m r Q s W
s` a e j ~ ; , , ~ I
s ~ f ' 0 FWAL TOTAL, IMPACTS 3789 4789 8578 0 ~ ~ ~ a~~ W ~ o
~ ,_i ~ Ei ~ ~ ~ : ~ N ~ N~~
M ~.t. e. ~.~cf -l ~ ~~,1` Q Z~~x DELTA FINAL TO EXISTING 775) 763) (-12) ®o
00 ' X. a ~ ~ ~ . ~ VzQ
I ~ ~ ~ ~ _.f i" i mi" A 1 B ~ _ n, p p V
yi~~~ / B ~ 1 p , , I ~ ~ . i B 1 N 2^ TOTAL AREA OF ZONE 1 BUFFER WITHIN PROPERTY BOUNDARY = 8218 SF (0.19 AC) Q ~ ~ W
~ / ~ ,i B y y - , i E 0 " ~ ~ ~ - W
Z IE ~ B ~ 1 l 3E ~ I w r TOTAL AREA OF ZONE 2 BUFFER WITHIN PROPERTY BOUNDARY = 5366 SF (0.12 AC) ~ w
~E ~ I EXISTING TOP OF BANK ~ / ~ ~ E~I~TWG~ TOP OF BANH 9 ~ roP of gaNK TOTAL =13584 SF (0.31 AC) w Z ~ w w
1 ~ ' ~ ~ . ~ , ~ ~ ~ ~ z
~ I ~ z ~ ~
1 1 ~ l t ' W o ~ MITIGATION
t V 4 ~ i ~ ZONE 1 =1,216 sf x 3 = 3,648 sf; 3,648 sf x $0.961sf = $3,502.08
ZONE 2 t ~ v~_ ~ ~ o ZONE 2 ~ ~ ~ ~
~ ` ~ ~ 1 . j / 1.' i ~ r_ ZONE 2 =1,106 sf x 1.5 =1,659 sf;1,659 sf x $0.961sf = $1,592.64 r-
} ~ ° ~ % 1 r } 1 ~ i i~ }
f ~ B ~ y~ / I I ~ ~ X o m { ~ ~ ~
_ m
~ ~ _ ~ ~y / ~ ~ B / ' r PREFOR ED ~COUR \ ~ x A > 6 HOLE (P H) ED SCOUR I ~ JUN 1 ~ 2~C9
B r ~ ~ ~ ~ ' m S~E~~RETA~L SHT. C 4.3 ~H) 'ALL, SHT. C 4.3
I , 1 BOTT0.~1 ELEV.=X31.00' J~ m ELEV.=31.00' pENR•~NA7ER~QllAll'iYY ,r~~u,~ta~ t,~o sTat~r~t ~~~a
~ ~ \ ~ o~N r i ~ A ~ A ' N ~ . ~ i
~ ` ' . ~ : i . • ~ n :.tea ^ / ~ j i ' u / I
0 X f i ~,.uu~ ~ ! 3 \ ~ `C i , . B .e~..., ;1 ~ S ~ ~ ,t PREFORMED SCOUR HOLE ff }
ti / ` 4 t
0 t j ~ i 11 ( a i i s ~ ~ ~ PLAN VIEW ;t 3 to
~ ~ 3 1 / ~
~ ~ ~ r ~ 1 ~w~ 1 t i 4 `E i t Pipe Outla
x. t . - ~ ~ X / ~ A A
~ - ~ ~ ~ - ~ t ~ " ZONE 1--'-'""~ k ~ ~s`~ ~ f,t ~
ZONE 1 ~ ~ ~ ~ ~ / > a „ t~ ~
~ ~ t 1 ~ ~ ~ I ~ ~ 3
/ I D d t ~Cx B
' I- ~ ~ nstall Level and Flush z . ~ ~ Square Prefiormed
~ ~ ~ ~ ~ } i t with Natural Grountl `i 1 Scour Hole {PSH} i i I W
x~ ~ ~ / 9 ? ~ y B it z B ~ B a LLJ
B e e ~ 1 i i i ~ U
i I ~ i -0 ! ~
~ ~ 'f I, ~ ~ ~ o ~ B ~ i P ~ a { ~ ~r , ,3~ ~ ~ ~o
' 1 ~ i B f~ i .i / '/i r ~ ~ X t /~~~v 0 1 N SECTION A-A W ~ ~ ~ Q - N
I ~ I ~ 7 / ~ ~ Pipe Outle Turf Reinforcement Matting ~ ~ U
i 8 N North American Green C350 F~ OrApproved Equal ~ Z
~ / B ~ B 1' Naturalfround J O =
~ ~ J ~ B i B / 9 i I~' Z ~
X / ~ o ~ B; B o 1' Tuck ? J 21 W W ~ 1' Tuck = ~ J
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X / t X ~ s ~ N ~
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( X\ y / 9 B ' ~ pp~ i r
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~ ~ ~
~~X ' / f~ B / / . B I
~ V ' ~ X ~ ~ PREFORMEDSCC v ~ ~ / ~ 0 ~ HOLE (PSH) 'EFORMED SCOUR )LE (PSH)
,X 232 ~ ~ B E SEE DETAIL SHT. ;E DETAIL, SHT. C 4.3 NOTE: EXISTING RIP RAP LOCATED WITHIN ZONE 1 BUFFER, AND OUTSIDE OF TOP
® N ® ~ ~ ,BOTTOM ELEV.-2 _ , 32 231 - - , ~ ~ `ti 1TTOMELEY.=227.40'
1 / 5, OF BANK, IS TO BE REMOVED DURING CONSTRUCTION, SEE STORMWATER
N PLAN C 4.2. ENTIRE ZONE 1 BUFFER AREA IS TO BE REESTABLISHED WITH o
® ~p a HIGH QUALITY PLANTINGS, SEE LANDSCAPING PLAN C 6.1. ~
X~ Z z 0
~~'~233 °a o~ U
_g ~ ~ _ W d
234 ~ ~ 4 ~ I '
~ i~r w ~ ~ ~ ~...w ~ e.
~ a S w W
_ w w...... ~ T ~ ~ .w _ 1 -LEGEND - Q 0
. O 4
~ _ `'y Z S, is ~ DATE:
~,o w ro,w 03-23-09
z, ~ , ZONE 1 BUFFER PRELIMINARY PLANS °RAWwoR oB°s BY,
Pf~~l~ Ci.E~~&-~ ~ w~ a ~l1TT~~i ~ ~ ~ Troilwood_Psh_Buffer
µ ry. e NOT FOR CONSTRUCTION Boa NuMaER: ZONE 2 BUFFER 10.049.001
m _ ~ ,..a ~ ~ 3.. . DATE PRINTED 04-30-09
TranSite Consult. En rs. B U F F E R ZONE 1 BUFFER IMPACTS TRANSMITTED BY 5 IMPACTS
PLAN
i u u~ u v v v v
~i ~i ~i ~ ZONE2BUFFERIMPAGTS
; SCALE SHEET I~Oo~
FXI.4TINC; RI IFFFR I~r1PAC.TC
TO BE REMOVED 20 0 1 0 20
ul~rtK At; I t VLAV
3
( IN FEET )
(D THIS DRAWING IS A COPYRIGHT OF TRANSITS CONSULTING ENGINEERS, INC., NC, 2008. PLOT DATE. 04-30-09