19970893 Ver 3_More Info Received_20061016

G.N. RICHARDSON & ASSOCIATES, INC.
• • • -• ••
MEMORANDUM
Date: October 16, 2006
To: Stacey A. Smith, P.E., G.N. Richardson & Associates, Inc.
From: Kinjal Shah, E.I. G.N. Richardson & Associates, Inc.
Re: EC Plan & TN Loading Rate ~~
Shotwell Landfill, Inc.
Per your request, erosion & sedimentation control measures and Total Nitrogen removal rate were calculated for Option 1,
complete avoidance of wetland impacts for the Shotwell Landfill.
For N-loading evaluation, total 86.46 Acres of drainage area were considered. Summary of TN loading rate for all catchments
shows that the Total N-loading rate (0.39 Ibs/ac) is less than 3.6 Ibs/ac limit; therefore, no nitrogen offset payment or water
quality BMPs were required.
Summary of Weiahted Averaae of Nitroaen Loadinas from Catchments:
Catchment Acreage BMP TN Loading (Ib/ac/yr)
Catchment 1 12.68 0.38
Catchment 2 13.65 0.38
Catchment 3 10.91 0.39
Catchment 4 2.89 0.65
Catchment 5 23.85 0.37
Catchment 6 12.93 0.38
Catchment 7 9.60 0.39
Total for development 86.46 0.39
For erosion & sedimentation control measures, all stormwater flow volumes were calculated using the HydroCAD 7.10
computer program (utilizing USDA-NRCS (SCS) methods) based on 10-year 24-hour storm event. Drainage areas were
determined using a planimeter on topographic sheets of the project area.
Summary of Runoff Values
Drainage areas Inflow (cfs) Outflow (cfs)
~'` C hment 1 12.68 46.69 8.05
13.65 57.10 9.06
Catchment 10.91 37.45 7.23
Catchment 4 2.89 19.52 9.16
Catchment 5 23.85 85.11 5.22
Catchment 6 12.93 48.71 5.64
Catchment 7 9.60 6.89 1.87
D:\project files\Shotwell Landfill\Wetland Impacts\memo.wpd
14 N. BOYLAN AVENUE • RALEIGH, NORTH CAROLINA 27603 • TEL. [phone] • FAX. [phone] • WWW.GNRA.COM

G.N. Richardson Associates, Inc.
ENGINEERING AND GEOLOGICAL SERVICES
Neuse River Basin:
Includes Cary, Durham, Garner, Goldsboro, Havelock, Kinston, New bern, Raleigh, Smithfield, Wilson, Durham County,
Johnston County, Orange County, Wake County, and Wayne County.
10/16/2006
Page: 1
Total Nitrogen (TN) BMP Removal Calculation Worksheet (Automated)
Project Name: SHOT{y'ELL LA:'~'DFILL
Date: 1 ti/1 G/2006
By: Rinjul Shah Checked By:
Directions:
> It may be advantageous to split the development into separate catchments to be handled by separate BMPs. The tables below allow the
development to be split into as many as three catchments, and can be copied for greater than three. NOTE: Unless runoff flowing onto the
development from offsite is routed separately around or through the site, the offsite catchment area draining in must be included in the
acreage values of the appropriate land use(s) and treated.
> Above each table: Enter the catchment acreage in the top green blank. Based on a comparison of the post-development TN and TP export
coefficients you calculated above to the rule requirements of 4.0 lb/ac/yr TN and 0.41b/ac/yr TP, select BMP(s) from the list for treating the
catchment runoff Enter the chosen BMP(s) nutrient removal rates in the green blanks. If more than one BMP is to be used in series, the
combined removal rates will be calculated automatically in the blue blanks.
> Catchment Tables: Enter the acres of each type of land cover in the green boxes. The spreadsheet will calculate all of the light blue boxes.
NOTE: Compare the Total Catchment Acreage for the Development (final table) to the value you established in the pre-BMP worksheet
tables, and also to the site plans, for consistency. All of these values need to be the same
....................................................... ..................................
......................... ............... ...............................................
....................................................... ..................................
......................... ...............................................................
........................................... ............. ..................................
......................... ...............................................................
T1~ ::::::.::.... ,,''TP;:;:::: I?esigiStaudarii.:.:.;.;';':;::::;:;:;:;:;:
BMP Wc~a~eter-fio4 PohtL' 25 40 NC BMP Manual
NUtrlent ~itoi-ntssater.fir~ectand::.. 40 35 NC BMP Manual
RemOVal Sand >i filter '' 35 45 NC BMP Manual
Rates ~ioretcitio~{ 35 45 NC BMP Manual
~t95q FR'~le ;';!;';;; 20 20 NC BMP Manual
'. '.Vegetatied Fiiter~trlpwl ; 20 35 NC BMP Manual
Igvgl~p~eac~ei' `:
a~rx:>~eten~jon ::::::::::::: 10 10 NC BMP Manual
~p9q
Fj-
Neuse River Stormwater Rule 15A NCAC 2B .0235 Last Modified 5/23/03

G.N. Richardson Associates, Inc.
ENGINEERING AND GEOLOGICAL SERVICES
10/16/2006
Page: 2
tsasanl:
Total acreage of catchment 1 = ~_ ac
First BMP's TN removal rate = % First BMP's TP removal rate = ___ _ % ~ ,~
Second BMP's TN removal rate = % Second BMP's TP removal rate = °!° ~~/~~
Third BMP's TN removal rate = _ % Third BMP's TP removal rate =
TOTAL TN REMOVAL RATE - 42.4 % TOTAL TP REMOVAL RATE - 0
~ ,~,
c ~ .....: {..~............ f ~ .:.:.......... c x . ~. >.........................c~ ~ a~
T'ypgat ~a-i~?Goy~r:::::Ca~chiiieti SM: Fvr~ii-l~ pcyer~ge t~1F~G o.:::::tult-~ ~`v$rage:TMG o€ Cat~Tiii-.::: ('-~`.
T'rat~sporr~ti4~ai~perVitigs!;;; 0.46 2.60 0.00 0.19 0.00
Roofmpcrvioas 0.46 1.95 0.00 0.11 O.pO
Managed pervious::::::::::€ 0.46 1.42 7.92 0.28 1.56
~~ooc#ed pervious, ;' ~~; 0.46 0.94 0.00 0.14 -,0.00

4rea take?i pp:#~y:$1~P 0.46 1.95 0.45 0.11 0.03
R;r ::::.::::.:....

Rgaet~on tmfiervw~ys f~) "`

0.00
`.::.Pre~BttilP ..
' ' :::

8.37
Pre-~lylk'#`p

N/A
~oarl cl~y~~:: :r~~a:t~a/y=;

t

To#al_kreati#I;ievelu ittex
P

12.63

..........

.

P`te+SM1P `t'~

'
~'
~
~

6
0. M .::g.:::; ::::
t l:. Ot
g e ~ . P.T .. x
p..

/A
:.:.:.:.;, ,;

r::::::::rr .:.::::..: ..:::: '
i;i;Ez
.ott`f1¢/at
.
)'.
p.......~ ..
i~i~i(1k1df~Yr': ~.
~.
I'ONt^~MP:T .
:::: :

4.82 IFast=I3MI'TP

````

A
1iiad 6/ r .
(.....1.. C;oaii lit. r....
p.~..

''

' Pbd ~Bb4PTN Ex '~'r
t,.. [~
0.38 EP ' t>B11iRTP Ex oY
os........ p

N/A
? E?E : :::::::::::::::::.
.
``
(Ibiyclyrll
(Iblae/ r~~
D`...
Basin 2:
Total acreage of catchment 2 = ac
First BMP's TN removal rate = % First BMP's TP removal rate = ~ ~ ' '~`''
Second BMP's TN removal rate = % Second BMP's TP removal rate = ~Y ~ ~~ ;~- ',
Third BMP's TN removal rate = % Third BMP's TP removal rate =
TOTAL TN REMOVAL RATE = 42.4 % TOTAL TP REMOVAL RATE = 0

.
.
.
TYp..vf~,and.Co..er ........... ..~a~..hm.~... ,
.
~~.1YI~o~nu.~. rt'~e..age.AMC:~.:: :..~...u~nn...... .Average.~3MCof. ....a.umri...........(~).::
.............................

'':' ::...::::::::::::::::::::::::::::: ............

:::: `crew 'es: .............

:: t#:46:f8:3I::: ...............

:::::: .:: tii 'L ::::::: .............
. :r:
:. ... 4 :: .................

:: ::: .: m ':L ::::::: ....

:::::::: .............
;: .
: ~ .: :::::
Transpor~ahon ~rn~ierv`>tbds 0.46 2.60 0.00 0.19 0.00.
Roaf.imp?ervious : r::'s 0.46 1.95 0.00 0.11 0.00
' ':1~Ianaged pert/loos' ..:.::::::::. 0.46 1.42 8.66 0.28 1.71
waoded.pepuious . 0.46 0.94 0,00 0.14 0.00
iApeatp~eoijp.bYaiMP...:': 0.46 1.95 0.35 0.11 0.02

Frachon:lm sous (I) :
0.00 '. Pre;~tYIP'TN
9.01 Rre=~M)I• TP
N/A
' ` r:. ::::: 6 Lti~?$ (liEtfyN}: x
r,~aaa~atx~~:.

To#al 1rea;n€>~evetop~nettt -
13.65. Pre >'I'(Y ~Xpo
- 0.66 Pre B1S?P.'tF ~xpor:
N/A

,.....,. .:.:.. ~'I ... .

Pdst:~.. PT

5:19

`~!ost~MP'I'P

N/A
~.u~d:Qb/yr):" ;:::I~sd.~ibtyr~:
:: Pos-SDEP!'I`1!~:Pi:

'0.38 ::Peaf~gMP.TI'~x'or
R.:.

N!A
E ::.:::.................................. ............::::::E;:;:: ::.:..: E:::::: ::::: .:fltihalps)i. ::::.:.. (Ib/ae1.
?`!~;.
Neuse River Stormwater Rule 15A NCAC 2B .0235 Last Modified 5/23/03

G.N. Richardson Associates, Inc.
ENGINEERING AND GEOLOGICAL SERVICES
10/16/2006
Page: 3
Basin 3:
Total acreage of catchment 3 = ac <* .~~
First BMP's TN removal rate = % First BMP's TP removal rate = w ;., ~ i',. ~ a i `<v ~7:' % ~~~
Second BMP's TN removal rate = % Second BMP's TP removal rate =''~ ~:>'
Third BMP's TN removal rate = % Third BMP's TP removal rate = % ~ :;
TOTAL TN REMOVAL RATE = 42.4 % TOTAL TP REMOVAL RATE = 0

..............................
T3'Peaf:.IwUnd.Go.~ep ...:: ............
.~a~C.1-t11pgt .............
5~1~; FvC#n4lA ...............
ptver~ge~1~C b .
.: ...........
:: Coluetut .: ..................
tlve~age.~MC 91' .................
~tilumn (Z)*:
;:; :~ ... e:::: :: l3.46.. 8 .. ::::::: .:: tii ::::: :: .
'-TrdnspUrfhgn,in~iet~ab4& : 0.46 2.60 0.00 0.19 O.UO
Raafmpecv-oos 0.46 1.95 0.00 0.11 0.00
Rlanaged pervious, ; ;: 0.46 1.42 6.67 0.28 1.32
woo~#ed pervious 0.46 0.94 0.00 0.14 0.00
!'.!?~-'eaa~~ei ~p:~iy$~p: 0.46 1.95 0.63 0.11 0.04

~:::: : :::: ::::::::::::::::
xf
cact~on lmpe3rt?v~gs (~) ;:;::;:.

0.0
0
fPrie`B1kI;PT't~

7.30
Qri=Blulp'T`P

.:: ..... .. .
' '

/A
I,o;ad (lbfYr) ~ Gaad R47y
Tb#al Area o£ ITevetapment =;'; 10.91
Pre $l1#Y1'M $Xpo ;
0.67
Pre $MP TP ~xpOf
N/A
Ih/ae!
E.... Y~>:
Oh1~4/yrl ..
P96t-$~kl~!:T : 4.20 ~!(ist $MP'f'A N/A
i.oacl (l~/jar):: C,txd:~#blprj~
Posi=8b4P TN:~ie'''''
PA.
0.39 Pos(=Bht~:'T~ ~x or'
P.
N/A
flblagFpi):: (ililee/yr):;
Basin 4:
Total acreage of catchment 3 = ac
First BMP's TN removal rate = % First BMP's TP removal rate =
Second BMP's TN removal rate = % Second BMP's TP removal rate =
Third BMP's TN removal rate = % Third BMP's TP removal rate =
TOTAL TN REMOVAL RATE = 42.4 % TOTAL TP REMOVAL RATE = 0

y
td'
``. `: `C`. of ~ Gov r :.:::::.:.:

ype......La _ ......~ .............
:::::~::::::
...
..~~. chm;~~f

...
~::: .
~a~. k'. r~sula
eve : e C

.......t`ag...iF1-'<....o
;;

......Goly~rpt;.;.;.
~; :~; ; ; ::;::.. ;~

....ve..a~e.~MC,a...
; .

.Cnlymit...... (2):~:
?4~''e~Se.. .(((~:df~$3I) 'i'ATjmg/L) .~~}.'`f~)"{~3: . TI'~~~~..: .:.:::;:f3~*.(b)

'.: Transportation impcr~~ous 0.46 2.60 2.77 0.19 -0.20
`. Ropf:(mp,~rvlots '' 0.46 1.95 0.21 0.11 O.Oi
;ly[$gedpervious; 0.46 1.42 0.00 0.28 0.00
Wopdect;gervious''.: 0.46. 0.94 0.00 0.14 0.00
!Ir~rea tnkeit::gpDY 1~1~Y 0.46 1.95 0.30 0.11 0.02

Fr~eCion ~mp¢rv5aus (~'._.:
0.88 I'rc ~~'1~'T
3.29 Pre-~1V11' TP!
N/A
T.uad.(IbJyr).:: ` `Lasd.~i6tprj:

~`v~al Aces ot:Deuelojsiieit`.=:.;
2:89 Pre•BDEp'TN Ezpo :
1.14 Pre BffiP T~ Expor
N/A
~:~......,:,., `'' flbfac[Y)i . : alblaeiyr).:
Post«.B~i~''f[~
1.89 :>Postt;~M>~''~'P
N/A

, 4
r
a;oad: I~ ....
(... Y. ),..
tiT
~~ I-eald r . .

.............................
...................

...........
........................

.........
.::::::::::.

.
os $
t N1P..N Ek

............ 1n4.

`'
'`

.65 P ::::::::::: :::::: ::o;:

ost BM)' TPFac

~. .

`
:'
``
:

/A
r
b
~
1 ./4C .).
Yri'
(. i
~
.
!
c
Pb.a f . 1.
~:::

Neuse River Stormwater Rule 15A NCAC 26 .0235 Last Modified 5/23/03

G.N. Richardson Associates, Inc.
ENGINEERING AND GEOLOGICAL SERVICES
3asin 6:
Total acreage of catchment 3 = ac
First BMP's TN removal rate =
Second BMP's TN removal rate =
Third BMP's TN removal rate =
TOTAL TN REMOVAL RATE = 42.4
First BMP's TP removal rate =
Second BMP's TP removal rate =
Third BMP's TP removal rate =
TOTAL TP REMOVAL RATE = Q
10/16/2006
Page: 4
i ;.:C1) ::::::::.::. :::`: `.:::f?~`: >E3) C4) a~):::: ......:C~) < i; f7? ,;;;.; ::
e
T p aft,a-iElDover..::::::::
'
:ttaE~liiileiit:
S:M::~ormula
Avei'a a BI~C o
$ ..
Dolu~lin.:..
:2-:veit•a a ~MD.o€
5 ..................
Caluiii~i Z.
.............. . _ _ f ),..
~Ac `;' 'e ~ g46a8.31) ::'#`~ {m L)'. I (~J `(3 "(4 :'' 'r~ (iri L)`.`.::. :: , :: 3)~ (6)
". '')~r~nsportatiiii:iiiipei-vluus: 0.46 2.60 A.00 0.19 0.00_
I~oofi~mperx,utts 0.46 1.95 0.00 0.11 Q.00
aklaiiagi~1pervious 0.46 1.42 7.94 0.28 1.56
': Woiiited;perviou§ 0.46 0.94 0.00 0.14 0.00
Areaaai+:eu upby;B1VIP 0.46 1.95 0.70 0.11 0.04

Fracl~on lmpesWisaus(t) _ 0.00 Prr-BMPT..
` 8.64 "Pre-~Ml'TP N/A
'::
:;bad Ilsl .t' ._ Load b/Fr

'~oial4rea.o€:btrveiopatieut~
12.93
'r:::: ptk>ST~P'1'NEkpp'r.
::.:.::.
'
0.67 Pre-BMP TP ~zpot
N/A
.. `E':'` ':'`:: {Ibl9C~Yx)
.: 'I tlplacjyr) ,
Y!ast. BiYIPT'.
4.97 Posf-~11~1' 3'F
N/A
`j
ffa:ouct ~/ r .
IL:uad: bl: c....
::r_
p°.
0.38
P....
...
N/A
~.. ~ ~:: °fltiFacFri)' piObliiePkt):'
Neuse River Stormwater Rule 15A NCAC 26 .0235 Last Modified 5/23/03

G.N. Richardson Associates, Inc.
ENGINEERING AND GEOLOGICAL SERVICES
10/16/2006
Page: 5
Basin 7:
Total acreage of catchment 3 = ac
First BMP's TN removal rate = % First BMP's TP removal rate = '. «u ,~~? % ,
Second BMP's TN removal rate = % Second BMP's TP removal rate = ~ ,
Third BMP's TN removal rate = % Third BMP's TP removal rate =
TOTAL TN REMOVAL RATE = 28 % TOTAL TP REMOVAL RATE = 0

f ` "
'>: ea .Ifragd Dover:::::`
Y1? ...................................
`.:~'aiehinenf:
.......................
~M~ Frirfnula
...
AveCa a >~M~ ::
g o

Gblu~etu ..
.eve ' e
rag EMC~:Qi

Colainn (Z) :'
Ate' .. . fQ~6 ~ 8.3I). ::::::'~'N ..... L 2) x 3) ~ q~:: :::...Tp( L :: (3~% (6
'Cragspor~Eatan'iiuperv[a~us 0.46 2.60 0.00 0.19 0.00
Roof mperv-ois: 0.46 1.95 'Q.00 0.11 0.00
Managed pet~utous 0.46 1.42 .5.67 0.28 1.12
Wgodppi!vio~is.... 0.46 0.94 0.00 0.14 0.00
Ares aak~tiiih2t~a3NIP 0.46 1.95 0.83 0.11 0.05
$riicCTari 1Em voiis ~:
.
.
.
{~ .
[?~'. 0.00 ~'~e 8M~'

`
6.50 P~e-~M)~"I`P
N/A
.
.
.
...:.;.:.: : f.oad. lb/ :r :.. Lo>id liJ t:

'C'oia.....rea.o~beveEopraent ....

9.60

; ; m r
Pre=S~P..N>;%

.
.
::

0.68
F!te=6MP7I'3PP.it'oF

N/A
~
~
.
. it
~!Y?'):;
':alp/ad3!rk::
;Post:~~ti'~' . 3.74 _, host-~tMP't'P N/A
Iyoad ISl r := I:Y~s #ti/ ~
e6 _.•. .
st Ifl1#E:T:N'Sz' 'r

p° ,

.39

Pesf-BMl'
7 ~. ~xpor

/A
~~ t~6laclvrl: :::::::::.:rlnr$~rv~r:
ted Average of Nutrient Loadings from the Catchments:
~~cFiiiiei~~Posk:$MF; has#-BNIP
......................
ikereiage .,7'....L.vad>I~8 .....Ti'.l~aaantg..,
..............................
;Cachmeiit;I;
12.63
0.38
N/A
' :CalelimentZ;;;; ': ': 13.65 0.38 N/A
'!Catchmerit~ 10.91 0.39 N/A
Catchiti~n€ 4' 2.89 0.65 N/A
':Catcliiiiciil5ff 23.85 0.37 N/A
Catr~im?eit6; 12.93 0.38 N/A
`:.Caicf~meri~:~:: ::`.:::::: 9.60 0.39 N/A
l•'d'1'ts>a(JiRI~IYC!I>(31'~11/1~1`I' 86.46 0.39 N/A
Note: The nutrient loading goals are 4.0 lb/ac/yr for TN and 0.4 lb/ac/yr for TP. If the post-development nutrient
loading is below these levels, then the BMPs planned are adequate. Otherwise, additional BMPs and/or
modifications in development plans are required.
Neuse River Stormwater Rule 15A NCAC 26 .0235 Last Modified 5/23/03

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~ ~ ~~ r"_
;.SUbCBi; Reach On~ Llnk Drainage Diagram for No wetland fmpacts.Rev-2
Prepared by {enter your company name here} 10/16/2006
i{,d oC,1~,C>r~ 7 ~~ ~i~, ,, t ~~n ~ 1%~Ii`; F#~dr~C~[~ Sa?tware Solutions LLC

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