20140957 Ver 2_Acid Rock and Chromium_20051017

Michael F Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Acid Producing Rock
Alan W Klimek, P E. Director
Division ofWater Quality
The following documents are examples of how DWQ has dealt with the presence of acid producing rock
through the 401 Water Quality Certification process. These examples are from three projects in the
mountain region of NC where there were known deposits of acid producing rock. These measures were
used to avoid and minimize impacts from the acid producing rock through monitoring, treatment, and
disposal. This is not a comprehensive way to deal with acid producing rock. These examples
should only be used as guidance. Additional and/or varied measures may be necessary on a case-
by-case basis.
One
NwhCarolina
Naturally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet wvk�x Alite I I tv (�Lp Location 512N SalisburySt Raleigh, NC 27604 -2496 1-877-623-6748
Lic iqqa-- Fax (919)733
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper

OCT -17-2005 13:58 FROM:WRT 82e2964663
T0:91919733Ge93 P:2-,10
&tion , ;k
Ity for identlIfYing poteriially acidic ro(,
it of %,J,C. D.01, '%rill havc the responsibili ing, TheChoteclInicalUnit'"rithe
The Geotechnical Un st
locations an this projeOt aA4 Q01)"t'riggarriples as necesswY for te off potential, Acid-base
sr 4 in proposed cut sections for acid run
process of reenjug rock sal6l5lcs c011e:cT0 s lit th@ University of Tennessee to determine their
.qccounting teM Ore belag porforriled Oil these sample eld laboratory will bo established in our
I m0ner.
net aCid ileUtrali70011 Went'al (NP-Ap). EVCntUall�_' a f -eporting results in 2 Prompt
Aghe%fille office fpr the purpse of teqting the rock sarnPles and i as potentially ol(Lor bjMt. Daring
on tile b..vrir of these tests, proposed 01jt sections Nvill be classtfle'd gs From blust holes, and
�r,ng geologist Nvill evftlaate exposed rock surfaces. Oultin
oonstruOtiDn- all eu$lnee� Ot ey
muck frorn blast ShOts, on potentially h cavaLtionR_ The. contractor will Coordinate Rct'v't'es With ttic
�ngineer to enable 900cessful perforinance of the testino.
-A?) grcatdr than minus five (_5 < Np-
All rock excavx on having R not acid neutralization Potential (NP
c designated to be used in general embankment cOMtructiOn-
A�P) will b
or more
M=2��aving a Np-Ap less Than minus five 0 > NP -A -P) sliall be placed in One ock is
ignated waste area. if sulfide bearing r
I rock excavation the project OT iD a des
41,13roved encSP1511126on am's on gTea designated by the cotitracto� until such time a$
encountered, the materid qhali be sLoftiled in an shall
eloped. The stockpile area, eonStruotod by the contnctor,
speoifialnitietalloll S010101's Can be dev tone or limestone screenings P12ced on gi�ade prior to
have a one' foot thick layer of crushed limer d from Precipitation by
placement Of 9-ulf ide betring materials. The ntockpiled materials shall be protecte
= 10 Mil thir
to%,ering with a. ininim 'k irnpemeablc gc:omornbritno, The location for the teMPOTAry
sulation area would be alon�g the existing right Of Way in 111e, project atea, A
cut configuration to blend in witb
stockpile and the elicaP tion could be gradod Into a false
finisl ted encapsulation area In this loca
the existing tbP09T8Ph)'- ptual design would 0011
- -Ipsulation ar�,,o has not Y6t bcrn made; however, Q cOnce -Of
The design of the elic cruqhed 11Iflestorle covered witil an 1rapernienble synthetic liner and one foot
- planed, Ille hot rock would b0 placed
for about t%VO feet Of Ifide bearinr, r0glt %you'd bf. lime betweon, I!fL% at the rate of 500
limestone screenings on whioll the su an application of agriculmral c P
in lifts not exceed,,ng two feet with � entire area sball be
are feet of surface aTea. After the last lift of hot TOCk. 1h
pounds per 1,000 squ ayer of clay sail, and an impermeable
with a one foot la),.cr of &gricultumi lirne, a two fOOt 11
covered all be covered with H tainitnuin of three reet of soil. A
Inernbrafle. The ByAtllptic membrane gh $lopes, -and the arcEl Will be seeded and
f topsoil shall be placed oil the ctnbi�nkrnent
orle fooL layer 0
mulched linmedlavely.
rM water qualitY testing of all springs and
A program hag been Cstablished within NC DOT TO WfO gpringq and streams are being sampled and
streams encountered along the Project- The %vattf In thcs* Ically,
iy basis to determine the background levelr
. of acidity and mineralization- Specif
watod,011 a month rMed-
tile following water quality tests are being Perfo duetivity, Alaminum, and. in 1116 case of
PH, salfilte, AaidlrY, Iron, AlkalinitY, Mfinganese, Con
. Zinc, CadMIUM, Ond Chrorn'um ate lab for
anomal0uq. resultq: Copper ' Unit PMOATICI who send SaMPICS tO a Pf1v
$arnpling is currently conducted by Geotechnical e Ashevillo flold otylee. Sampling and
analysis, Eventually water quality testing will alNo be done in th
0 tIlrough and after thlb e0nsttucTiOn period. yrom this program, it should be possiblc
testing will continu 'aldf qual'tY cause'd by the project tuid the efficacy of tlic
to uses$ the level of any degradation Of N%
miti,ation measures.
A-18

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it -A I
p- 3/10
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xravated
EL3. Of e e,,,ployed, I
rentl .,, be
-po , W
daci-ulg %eas,.Ires d - - - " rocx
acid Proand what 0,untere Wista
-or on . enc alla
t" test , terial 15 alfidic or. Vr uvted
colotruct7L 0
I-ri-rig %3. 41t has �Iag
d1- �e Ce Of 0
ac id D rc)duciag CjrC-a%T- Ifto., t1ja pzolec - ty sanv,
Urn . cpjal�L - AJC
me Y-Xlw Vir a its of for
�jA3.Aj X W 1'�-
tile . 're%%l otentxa
In alld
.ro ,r Igati-O'As T:e tyle P
a
&WVw- " t area.
r
-a, juve lee dicate
,eotechll� time Pro sav
.jogram Ong and Wate
p stigat, -%al- -ram has
!Lave I ij�g -prO19 b,aseli-ne
f f Is Mini , to as Water Samples have
runo ity SOL"'P1994, 110 Vater
,he water qual p TO date' - - A16 t1le tri-Ictio%1'
water since June, -at. , cout"o Con$
0'arface the Vr03 NCD07 a0d after , 0 f ourA
rhroug , az . r I
data fo'rdit-ions' 'm Itivitios 'UnI nas
ali-ty . a " Con . -roara AC -* I
I
8 ova ,ld test'-%* or detao tll� Geot, and
sa%91-�-ng ,aavati-Oul rates i
subst :1catJoUr
dent:Lt mor-)
1; 5%13. the t Vill from blast
to ;�Vapac
d a Plan tor .1fide seologis 7ad Mucl '-V�ea-r3-Ag
of exq at
develoP6. .9 . fi. 'nandl in(3
'01ast n0jeor
Ioll an engineerio to f for the op eme%M C1
diSPQ9'- joa # tings f r, var-i-0110 -
.0 a -at t G%C% t'AP- will De
constr�. jn IS
5UT rov;Lajous ro -for CD
tacesr ..13 t10 C OT
'rocIc I ote%'� , he 9 qQ bp-ari%19 fL% i r
,,UotS on tared, t Salfide, b a 0
enco . on of t:he the xrp
are ost-X . -page i�andllug
and d-� SP -ee jog and as of the Vater
11ately idezti-f-y
arls f OT Provided COVI
P,rovisl e:ced) - geologica and
eucOU37� t SP ce Vill be -res-alts F - bea:r'ug
rV3- testing strategy,
�y Ban,91:L'Ag
Via ?Ores almd f any
0,
8LMpl:LTG qua"-' j,,d1-iXLG tjoA-
,,ity S, -,,d Vil,'-" nd U, tj:UC
i er rions a ti-fYing, 0 Cons control and 'ase
.tiga Jdeu tered du-ri-ng
nv . Sons for encoun err Ve ezo6jon I I 0�nd
PrOVI if --j ot1jer
er-3�al i eff for deO'�(-3% tvo we
fftat 'planni-Ag for are - Prjority.
t.cwolosieo wleis
5 �a aha Ga
or t,
Icated treatlo be V4
roosals
st ava, 1c
tue of asu-res
Of-, strixetion . %- e 07:� me . deslgl:�
coft ant Trkivlgat� . ,,,,t'c reSse$ have been
0 -ft revielroj ect procj S rish Wid
2.1%,ld lil"p- 'tc) the V - U , - PIN
V nd stream MQ ' - jdl�-"
1; C,
strlictu:res as 0 1,angeS a dillated.W-1th
C -1 C coox servIcel
halm r , e ageo ie tjo%, Ale
r .0 09 -5t reGO'ave - f �di%'
oAt:LU'111 I S VO*tp a C
:1 W3. Service, 'U - , d other jd13-
0 an . S -a CLad NO
063.0ut 9 VI .arrP-s
vi UG U. 990
-raes Cou%ra- , 5
,SOL% �th t U 4t
?.a Cp V e�.
accorda%� - -f9r.- Oig C
.41*21 t.d bY
:Me
�T�

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FROM: W�17 92B2964663
17-2005 14:00
I 'PreCOnstr,etion X001toling
N11,010dologles and
-sent on the
r
at ck V11,
01.�Om�
Ic W
10 -- I � potential acid-produdInF, VO
Rock �ess the I'luount'01 am 'Is beilS rarriod out,
__ jLa—n1P!U;v TO a� ck samp ling Progr ined f�Orn
project, an onsoing to e, .,A A_ 10,0 projer,,,,vere exan�
e,
,.,tent of ttle Ik W&S note�d,
Outcrops over t110 visible pyrite
may to August of 1992, Any oJect from 1992 10 1996, This
I conducted on the AN -1 0 PT kcid Base kccounting
(2) Exten. (14p), and Net
;jve d1illiog has beer d tested using the A
core has been sampled eXtensively 0 NeutrAization Potential By at the
,id potential (AP)�
the Ac, Teolo
Tnethod to deterIVIA6 TbaDePartmCilto'C uringthepre
I PoteTItial (N �ted all of these samples d
Neutralizatiot 'Ile has at raildom and samPlOs
jjniversity Of Tennessee '. 14�no"C-,q S hgvc. been selected
Core ample mpling and testing has bell,
OnStruction phase, SOrnO .. seler $ 375 core
ted, Additional sw3untered. To date
with visible Pylite have bee values were enC( d A -10D (18g)
performed in area where low NNP -10C (187) an
samplesh-ave been PmPled and tested on Pr9iects A
eet of core -
taken fTOM approx1ma.tely I 0,0oo f zser "hi"cd as a
, at y,,O%ville has bee potential
ly f UnivefsitY O�Teon' ,cjsions cOnCer'ning
(3) Dr, DonBYer rom the' icoblerns and de n this stlbject, and is
consultant to advise on Or -deal With P is a recogOlzed expert 0
D�r, Don Byerly S.Xce'vated. kcid producing
.d producing rOe"k- for Viandling tentid acid
act of the MnV& -Guidelines 4CDOT's handling of the 1)0
the, author S re. design Of the
,,jewing all phases Of 1� Ut into the
Materiale' . lie -Ct an' has bad !nP
producilIg rock on this Pf`jL
areas. . I afiscs. more. specifIcally, more
CO1.0 sampling and testing will coptinue as thefteec s encoul3tored with NN -p values of
(4) ate the size of the area
t.stine will be done to estit"
(-5) or lower- sess the effect of ac,.d drainage on the water quarlty' a WaAer
� �anl -1&19 To as
Walt e I pl� -amed out'.
Sam Ine program is being r — h2 en noted along the proJects
. s and flowing streams -ve be
Locations of sPnns
and -A -IM 'Year prior to the start of Construction'
�5, approx1rdately one at t,,,,ty_th... jocat-jon5.
In SePtember Of 199 'tjle , ras lr;Wated . ct corridor
OnS k -10C projeCOA and below the PrOJP-
water sampling al ions were abosen both abOve r 996, Water,,salnp"n;
These ...plillS locat �he actual construction. it, July 0 ;f these
and to be undisturbed by I jnjtjat�d at nifie locations. The locations
;vas uLtions are being
a S th,
lo � A,10D PrOje4l
sample Site$ ate ar-Victed in PLPP`eRdiY- " F-ach of the sampling loc.

TO: 919J973361353
296466*3
OCT -17 2005 14:00 FROM:WA-f 8 -
3
d contract
monthly -basis, and sainples are beim, subn�tted to a Cer0e
sampled on a sts unit for testing. "51,80 during
laboratoly Or he 14CPOT Materilis S; Te R by the CTeotechnia Ur�it
izontal drains vvill be tested for P] a Additioral sample
COTIstruction. hol on a rgonthly bsA - ally, areas
.personnel, as decribed irt 3(A) below, project develops- SPeL'flc
added at a later date as the areas win be monitored.
,aybe and COUUV!al
below the two large waste areas
(3) Testing
A. onsite -Testing able on meter and followirig
te at ared to the PH results
,mVer ure are rneasured usi�g a port
1, pli and are logged and cOMP
ASTM D-1293. The pil results 3(o) beloW),
from the contract laboratory (sep- ember of 1996
be tested bi the field beginring in Nov
2. ConductivitY vAll also a portable rondupfivitY mew.
on a Monthly basis uSin-9
13. Laboratory Testing
one sgmple is tested by a certUied Contract laboratoty for p14, Acidity,
gach of these samPics is tested for t1118
alWty, and Condur-livity- dard laboratOTY testing Procedures.
�'n
properties listed be -low "Ing 5t' equivalent
ASTM D-1293 or '.
PH 1).1067
ASTM
Acidity AsTm D -i067
AlkalinitY kSTM
Conductivity CeTfifted contract
is tested by a
A third sample, cont2leing a rCitric acid spike Alu inum or other specifled
te ison,.Mangw1ele, and In. for the metal
ratbry f0T Sulfa 9 n the laboratorf
labo ach of the spiked 5aliples are twed I edures. Note'.
metals. E using standard laboratory tftfing Proc
any metal ion SPec"es 'n
species listed below
acid is intended to. prevent
'c
The sPike Of t"tt . itating.
solution from P'rcc'P
tvalent
-516 or eqtii
�SO4) AS�U 1)
sulfate ASTM D-10611
Iron ASTM D- $58
pnese (Mn)
AsTm 1). 957
Mani
A rr�jnum (Al)
lu

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4
samples selected spiked water samples may be
e results of previous ','Iistedbelow.
rjiven th itionAl metal sPec'e
tested for thi add ]),168S or equivalont
(Cu) ASTMI LL
Copper ASTN CG
Cadmium (Cd) A D-3557
ASTV, D-1687
Cbromium (Cr) D-1691
Zinc qn) ASTM
at precision limi:ts for the, various tests
4, All laboratory tests should be such th
ar,
Els follows,
Acidity tests', 0- 1 P'
1.0 epm
1,0 0/, Micromoh(CM
Mineral. species: 0-1 */11
Me
,tal species, ppb OT lIg/I
Of water and Xaste Wgteel(] 7th edition,
ethods for the ExaMinati0ft Water Works AssoCiafiM md
(4) on, AMenr-an 31inp
1989, American PubVIC lieaM &Sr'0clat! scd as a standard for saml procedures.
or, Control Federation) 'Is U r
Water Pollutipment and procedures will be such th"I ross contadination between
sampling equ p,evented. .1. t
sampling locations is ew of the project, the
eresults Of thp, first round of testing and 'evi a suirlCient representative
(5) B2sed On th Ist wll sp
'Iect samgng locations to PTOvidc
-project Geolog
'he'racterization of the project coxeldor.
surface WaLter C
sults of the sampling and "g, the sarnpling f�equency may be
(6) 13ased on the re -s bi-monthly, or quarterly) - the
(such as once every 2 week of decreased based On
increased or decreased 1 es tested for may be increased
Likewise, the suite Of sPecl
test rusults.
will be reported annUally by the GeOtechn'cal Unit'
(7) SgLmple r sult,
r Ironmental jjn�it
'stage
Bn.4dagidg, nvi
Itoring by u6ng- single
Unit pprfoyms water Moft
mental he construCtiOn (3f
:Loadside Environ
The 1 . a locations along the waterwaysvdthln and near t
samplers at nurn-rOu ater ,Mplcs autoInatically during rain
tamplers take w al Unit and tested by the
th 'hese sinSle-Stage f age of
C project. Uev Roads' IrOnme"'
'te
,d by the ide EnV
events. The samples are co )r suspended solids !and turbidity. The advant event.
als and Test Dit f( ng or just after a rain -
Nr -DOT Mated sample is taken duril
ers is that the' (:Ontrol'devices to
U.,;i- the single -stage saMPI jesigued erosion V
Os vVith tWis projkt,
s are the Most opportune tiMC for the e the
As is the case
These rain -event
avel to the waterways. would
flood stages wbich
fail and abow sediment tr asily accessrible, during peak
SaMple locaflons may not be 6

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-005
6
IeS sill be used to evaillate
all, � Quantitative subsMte
I fore6tTY,5�" ' - -dcarj)�Iidio)dde
,rhe bas6line embe acts liqu,
(awir'lAtura �atus that 111J will be taken frorn
by fine Be'. It romtXisiing land use e_cofc appi core samples
na a freez, ad to deterone
se&rnent MV ,,rrormed us" bottom 1lied and Slav
615 will be -.1thestreafn �Ieswjjlbe( roporflon of each
arkaly , . jaced,,witbir 110 Samf -P
rper tu within each s and slit). The
into a r -O si�e (gravel, S n
two randOn� locatlonlf each particle 1 aserme conditio for each stream onasts of eight
dry WQISP� 0 Dctevize the b Monitoring ell.
percent lafle biology 1.
�-dbstrate We �Wlll ebar I aq a (Xppendm 3) and
for the water qu&lity an' �Ssed by tho PT09rnCh, puncbc0r"Fork�
,fl-te stady Site are directly C'r(Xanch, Bur_kne, be the "OoAtrol
ted strcanls Creek will,
rht selec . mei, Bear Chandle- . 'onstruction
sites. The a, LaUtel C fornia Creek. )f the c oted dtes.
g 1
0 creel(, Big
include. ic M0111, and Calilles outside the boundane�
most of, the VotentliallY Wripa
k, jarvis 13r' � this strem loo meters In
Sprinkle, Cree Shed of
The water area comparable to
stream - drol"fige sanipled will be aVpro-Amatcly
,ct and has I -Fish and ,Idlif, A,98ociates
P,oje 1; )y
Ine
. stream reacbes to be ducted t
was to detr
,rojine and document
le Surveys We'chceso' studies on related WTI?
-Pre-cotlstvUctlon baser"' constructil
.re
gay 1996, The PurPose of t of anY h1V , ropalrel as we" asa
1996 and I or to tile stmt . stug. e5 . a tnVironmentiLt
January he streams Prl ap, sampling DT planning
the con mei and W�,
diflons Of A at the NCO' Vick,
both t4o 2LIe availible
In
These rePOrt"
Y Feport- 'Ontactins
sun ined by
Sranct fLnd can be Obti
C'O'nstruction.
as directed under
loll
81 'Onslruct Tbig
VA11 include
performed during r
sfInS vAD be �roduclng P-Ock- a and
tial Mid isitlorkal r-010- "nVle
'k Samprog and to I fdr Poten and al�
(l) Ro r inples, X draft of the Project
Ct Special PrOM101t, hand so
the VroJe 'Utfings, i. spiecified areW;
pling of drill
extensivc gall producirg rock
ontract. consruction,
d1spOsal Of Pot' basis
rOvisicy) is in the C,
Special P nthl� -
be C0000ued On a Mo Ah In areas whe
ling and testIMS vR11 'ry other mot rences it'
-d to eve ot large diffe
water samP. -To`15c %to are'D increased or
11 potentially be der arj� or if the
sampling W, _,,,plj�tcd e I for may be
flNitles are r r
,,er
testec
%;Ase, the SIAD of GPe
results.
suits. as waste aroas and
sample
ed deVe"ding on 'he test re
decreas )a at any th",
be add
Y
sampling lor-afwns
d.
are establishe
ditioual wale
(3) Ad d �101ties'
co.struction relate
n and
it
ro
e- VAII be 110stalled ol, the UIPATe2r
'r satripler!
onstructiOn, Oth - d. proper water sampillig Of the project.
ljp()Ii be�innlng 0 -ect as needed 10 Prov"
tb a life -
weeks throughout' onst�ruc;60f'
f US from r
a 10
sides of the Proj
ded every two ,,,,t coocentr
ed for $e6
do,nstreaM ill be: r
SMpl,
IA -e, the will be Messur
1:ikmW
St -ream Samples
T e down
h

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disturbance aiid compared with samples collected upstream and Previously obtained base
Pow data. The NCDOT will be con�nuously analyzing the test results from the water
samples to ensure that the -turbidity and total suspended solids levels are acceptable and
that construction activitle; are not adversely affecting water quality.
Environ-niontal !;Lnh
During construction of the project all nine streams will be sampled twice annually.
Aquatic biology and water quality baseline sampling surveys will resume in. Jaauary 1997.
Winter sampling will be carried out between the months of January and February and the
into
spring sample period will be between May and June, Since construction vAU Proceed
calendar year 2001, the monitoring period will cover a six year. period. Monfioring
summary reports will be prepared following each sample pedod and submitted to the Corps
of Engineers annually unless otherwise requested, Including pre -construction studies that
have bcon completed, a total. of 12 sampling studies will be carried out for this project.,
Pogt-Construction Monitoring
Gpotochnical Unit
(1) Water sampling will continue for at least one year on a monthly basis after
construction is complete. This can be mdended if requested or any problem should
(2) Streams below disposal sites wfll be tes . ted again at 18 mos. and 24 mos, after
construction is completed.
)1QWL14,q r-pyironMenjal L nA
L
Water monitoring sliall continue every two weeks until flnal completion of project
and all erodible surfaces are stabilized and permanent vegetation is established,
Contingency Plan
Geotechnical Unit
In the cvcnt'of significant changes in water quality and /or chemistry the
Gcotechnical Unit/ Resident Geologist will immediately notify the Resident Engineer and
Mow the guidelines stated below:
1) Immediate response:
A) Stoppage of construction activities in the afected areas until the acid'atainage
problern can be evaluited and remediated,
N
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'a.,e
rify , results.
itiOnAl sa'r'�lcs to ve be irLcrawed to
itwill take aa6 in will
13) Tbe Geowchracal lu� Or
hosen. and frequ ZY Of
w�l be C
'no, � ,,,Ie sites Contarnalral 01).
C) XddItio ce of the 011 Vjkj be uken by the -P'esldc"t
detorrnln� tue 1,01" aal
is Vropriate
D) After the source identified, I � or all of the d drailaage ""th
'lu"' an'
-F-tigineCT, which MELY inc Ato be PvOduc7lng the act
,rre2lmcfat 'of the area iden"Iv the streamS,
wiultufa., (3rade GTOUnd t,,attnent 6rectly to
.a, Gr%de Ground I'lMeston'- aifectedb, the runoff.
,rie
AVicultLlf dS and tfibu' s 61rectlY bly soluble .110yine
I ps Wig
PO N trenchps Utilizi
riteLtlori of alkgvererbarge 2..
amel and C40,R)
3. 1MV' , as Cau,
reinedistiOn, One of the
es addifOna
if the situation rellu",
tong tefM ,,,Orge - Ted.. or less 0
following ",,� be fOqt;l rap (Will be MOrB
,hes With long term),
Inage di�o VIorlr, for the These Stfucwos
'StMent of dTd
ree e but Will tructed. As or &fter
inimediate Spons Iced to be cons
or wctland sYstem may -S"Oeer at any floe
ermaRent bog he
d�
d gLt tb IscretiorL of V
may be adde . of Tnoessee . Y'...yoAlle will
Constra,ction. .1y of theUrlaversity and short teM
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3) M mention d -Ase O'ft weter quAty
be BV61able to Q
measures. S Una,
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r
are Irapatini; stream side
t [Uction 2.0'aVitles t the, AxO- Road
B99 -4-571d, that const 1jnjt Stsff shell On"'O' �j tbepro�ject
indicale it "hannels Oro%
If test res yn"ironment"
,,fOAB to be
tfal 9�0adskde , ho will follow the proper corrective ver the, CoIrrective
then thr, Cc" The WroPsate of
Oblem area, bOw Installation
�roblem areas devices,
,n.,Aro Corrict aty I nt ol� the nqtureol th" P of C., e to the
person"el to -na,,ce jsdn% ific OXCM du
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be ton contr
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additional &VIC . Ction phaS1115-
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(3CT-17-2005 14:03 FROM:WAT 8282964663 TO:919i97336993
if extreme or unu§ual circumstances arise due to contmtor neglw, i.e. elevated
pH readings Or excessive erosion and sedimentation due to breakdown of Best
Management Practices, additional baseline surveys will be implemonted after consultation
vAth the Corps of Engineers.
P: 0/10
A -Ib
U

R -0977A Cherokee County
POTENTIAL ACID PRODUCING ROCK MATERIALS
Descdption
Work under this section consists of testing for and disposing of potential acid producing rock
materials as directed by the Engineer. Acid producing rock contains sufficient amounts of
certain minerals that may produce damaging acid levels in leachate when exposed to the
atmosphere and weathering processes.
All fresh rock on this project has low potential for producing acid drainage. Acid potential in
rock is measured as Net Neutralization Potential (NNP). Acidity levels in runoff is reflected in
pH and sulfate content.
Testing and Monito7ing Procedure
Testing and monitoring consists of daily water sampling by Contractor's independent agent, to
be approved by the Engineer. Measure values for pH at the sampling sites and record
immediately. Monitoring consists of testing water from approved temporary and permanent
erosion control basins collecting runoff from the following areas of fresh rock excavation:
Sta. 18+50 — 24+00
Sta. 31+00 — 40+00
Sta. 52+00 — 61+00
Sta. 80+00—, 86+00
Additional testing must be conducted by an accredited lab facility and must consist of reported
values of pH, acidity, alkalinity and sulfate content on a weekly basis. Report lab results to the
Engineer within 7 days of sampling.
NCDOT Geotechnical Engineering Unit will concurrently test existing streams for the same
values on a monthly basis with results available through the Engineer.
Ex or Acid Producing Ro
,ploratoly Drilling f
Due to potential construction delays concerning excavating and mitigating acidic rock, a pay
item is included as part of this contract for preliminary drilling and testing to determine the
presence of these materials before rock excavation begins in an area. This falls under the
category of exploratory drilling and the Contractor may, with approval from the Engineer, drill
for testable rock samples to be tested for NNP at an accredited lab facility.
Testing Values and Results

R -0977A Cherokee County
If reported pH values are below 6.0, the Engineer will select a Mitigation Plan immediately upon
receiving results. Mitigation Plans will consist of any of the courses of action listed under
"Mitigation Plans" with payment according to the line item under "Basis of Payment".
Mitigation Plan
Possible mitigation methods for acid producing rock consists of:
1) Select placement and treatment of excavated material in a location to be approved by the
Engineer prior to construction. Location for placement and treatment of acidic material shall
be Uproved by DWQ regional staff (Asheville Regional Office).
2) Treatment of excavated material in embankment or waste area.
3) Cover treated material with soil plating meeting AASHTO requirements A-2-4, A-4, A-6 or
A-7.
At the direction of the Engineer, temporarily mitigate by treatment with lime and covering with
high-density polyethylene (.HDPE) sheeting at the excavation site while awaiting transport to the
disposal site.
Treatment consists of layering excavated material lifts with crushed limestone aggregate and/or
agricultural grade ground limestone. The average tested NNP value for this project is —16. This
corresponds to a treatment quantity of 16 tons of limestone per 370 m3 of excavated fresh rock
material.
Basis of Pa men
y
Payment will be made under:
Crushed Limestone Aggregate Metric Ton
Agricultural Grade Ground Limestone Metric Ton
High Density Polyethylene Sheeting Square M eter
Soil backfill Cubic Meter
Exploratory Drilling Linear Meter
The Contractor should stockpile up to 30% of the estimated mitigation quantities prior to
construction.
Excavation and placement of rock is considered incidental to work performed for the treatment
process and is considered "Unclassified Excavation."

Burdette, Jennifer a
From: Zimmerman, Jay
Sent: Tuesday, October 24, 2017 2:06 PM
To: Burclette, Jennifer a; Higgins, Karen
Subject: FW: Meeting today on the ACP
Fyi and per our discussions.
Jay
S. Jay Zimmerman, P.G.
Director
Division of Water Resources
1617 Mail Service Center, Raleigh, NC 27699-1617
Ph# [phone]
web page: htti)://www.ncwater.or
Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parries unless the
content is exempt by statute or other regulation.
From: Campbell, Ted
Sent: Tuesday, October 24, 2017 1:18 PM
To: Zimmerman, Jay <[e-mail]>
Cc: Davidson, Landon <[e-mail]>; Campbell, Ted <[e-mail]>
Subject: RE: Meeting today on the ACP
Jay — Below you asked, "would any Cr III in the exposed excavated sediment quickly convert to Cr VI and then be at risk
of being discharged to surface waters"? The short answer is that the conversion of Cr III to Cr VI would not be rapid or
even expected under normal enviromnental/atmospheric conditions because atmospheric oxygen is generally considered
to be an insufficient chemical oxidizer for the conversion of Cr Ell to Cr VI. Also note that near surface soils would have
long ago reached geochemical. equilibrium while sitting in place over the centuries so "new", rapid conversions from Cr
III to Cr VI would be unexpected. Even the excavation and subsequent erosional discharge of reduced sediments (from
boggy areas, for example) that contain higher amounts of the trivalent form of Cr (Cr III) would not be expected to rapidly
convert to Cr VI under normal environmental conditions that would prevail during stockpiling of excavated soils.
Ted R. Campbell, M.S.
Hydrogeologist, Program Consultant
Asheville Water Quality Regional Operations Section
NCDEQ — Division of Water Resources
828 296 4683 office
email: ted.campbell(a)-ncdenr.gov
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
From: Zimmerman, Jay
Sent: Thursday, October 19, 2017 7:27 AM
To: Campbell, Ted <[e-mail]>

Cc: Davidson, Landon <[e-mail]>
Subject: Fw: Meeting today on the ACP
Ted, -
I would like to pick your brain a bit concerning liberation of Cr in surface waters. We have been asked our
thoughts concerning possible conversion of Cr3, and subsequent liberation of Cr6 into surface waters from the
Black Creek Fm. I realize it's not ARO, but hope you can still offer thoughts. The Atlantic Coast Pipeline may
intersect parts of the formation and where this occurs near surface waters, the potential exists for sediment to be
released to surface waters. Although we would require steps to be taken to prevent such sediment losses, in the
event it occurs the question came up, "Would any Cr3 in the exposed excavated sediment quickly convert to
Cr6 and then be at risk of being discharged to surface waters?"
If you have time give me a quick call . We can also discuss tomorrow.
ffm
From: Taylor, Kenneth
Sent: Wednesday, October 18, 2017 7:53:38 PM
To: Zimmerman, Jay
Cc: Culpepper, Linda
Subject: Meeting today on the ACP
Jay,
I will be out on Thursday — taking my family to the State Fair. If it is URGENT, call my cell phone.
The Assistant Secretary asked if we had any follow-up on the potential for heavy metals in the Black Creek Formation?
A second issue is related to water chemistry. Attached is Vengosh's paper and the supplemental information where he
describes in page S 11 and S 12 the modified version of U.S. EPA Method 218.6. Do you have anyone in your Division
who can answer the question: Is all Cr in a water sample — Cr(HI), Cr(IV), and Cr(VI) converted into Cr(VI) using a
strong oxidizer, since only Cr(VI) is the only water soluble form of Cr?
Thank you for your assistance.
Kenneth
Dr. Kenneth B. Taylor, PG
State Geologist of North Carolina
N.C. Geological Survey
North Carolina Department of Environmental Quality
919 707-9211 office
919 390-4767 mobile
Kenneth. B.Taylor(a-),ncdenr. gov
Archdale Building 5th Floor, Suite 527
512 N Salisbury St, Raleigh, NC 27604
1612 Mail Service Center
Raleigh, NC 27699-1612

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Se ea Cata b� �­.�PN : x ffilillise PAMMONGNAM� X I
- -------------- - -------- --- -- - ------ --------- ------
i secure https://mrdM.LogLgw/gerieraVmap.htm.M=-79.390399965657&y=35.S453449609186&Z=10
Mineral Resources > Online Spatial Data > Interactive map
stream sampling locations. Insert show information of one of those sample locations. Sample
5284844 results are on the next page. This sample location was in the Black Creek Formation.
Scientific data near the point you clicked [Open in a new window] E3
Longdude: -78.849861 Latitude 34.860358 tolerance 0.01NN JJSON] fXML)
[Ep-d or Collatose)
-- ---------- fj!!ts ----------------- — ----------------------------- — — ---- — ------ — - — - — — - — - — ----------------
pord................................... . ....... — — -----------------------------------
Geology of US states
unit State L Rtb at o gy
Black Creek Formation NC c1a) V .4, sw
------------------------------------------------------------------------------ . ........................... . ...
geophysical surveys
ID Data Description
�type
3099 digitized so-r*ast 4."t, 15338 lift IdIts with sisiscirti I ol. of 1W
-"At
_�_Pbrt$
Florence NURE 21M�" C a I S v e y wit IN SP K if 6 5 iltS 0011ir OW U 0 f 2 0 W M C �llna
--------------- . ............................ . .... . . . . . ........................ ..
--- ered --- mine-m-dr-�-rces
CUrrberland
Tract Deposit Type "b"Wellimation MP
SA05 Massive sulfide, kuroko ".t—.ic Caotirl.
S A I I E pithernnal vein, quartz-alunite cter—ic cowl"
SA14 Not -spring Au -Ag ��t,cwic c!"i
-------- -- . .. ... ... .
. .....
SA22 Low -su lfide_Au -q u artz_vei n
_. ....
crust
Domain Crusttype Region
Carolinla Oceanic arc SC --l— ­'Onti. Ard APPAIKITLMS
- -- - ------ --------- - - ---- - - ----- --- --------- -----------------
ry of IS trearn sedimen I s in the U S from Ithe NIJRE­MSSR didateas
Sampit
les Date Sample type
10 coil ec tod
I . .. ....... . .. . .....................
5284844 1977-08-12 st— sedli—t sawls li`�'Flfting strIbiw, siMd to less thM 149 Ndc� (4011
ne- a�j driec at less tw o� equal to 1166c.
--- ea -in -t-h-e --- U- S-- -fr- o --m --- t h --e- -N- -U- -R- -E- 4--Z -S- R- --------- — ------ — -
Sample 10 Date collected Sample type
....... .....
1207519 1977-08-12 s-- -, Sa-.-e 11-tV0 through a 0.8 fflCro II., j, -. t
..... .. ........ ...... ... . - ----
1207578 1977-06-01 All �Iter sample filt" throw a 03 filte, t Tne s�td
-79 09021 35 08935
A,­,�tvibility FOIA Pri—, y PAilill, -11 Wic��
U.S. Department of the Interior I U.S. Geological Survey
URL: https://mrdata.usgs.gov/general/map.ht�l
Page Contact Information: Peter Schweitzer
Page Last Modified: Friday, 23 -Jun -2017 15:31:58 MDT
USGS Mineral Resources Data System (MRDS)
— Mineral Resources Online — Dots show NURE
stream sampling locations. Insert show information of one of those sample locations. Sample
5284844 results are on the next page. This sample location was in the Black Creek Formation.

a n X a ffiff H%R n&wt w- x
gs4m/nure,ise-dirnent!sho��-y-nuresp-�lI pho?r�tr ri-,-578494
W– - vc—
Mineral Resources Omine Spatial Data NURE-HSSR sediment geochemistry
NURE sample 5284844 (STREAM)
About the sample Chemical analyses
Element Measured value
Uthlum <5
Beryllium
Sodium
Magnesium
Aluminum
Phosphorus
Potassium
Calcium
Scandium
Tltanium
Vanadium
Chromium
Iron
Cobalt
Nickel
Copper
Zinc <5
Arsenic
Selenium
Yttrlum
Nioblum
Molybdenum
Silver
Tin
Units of measure
parts per million by weight
1.7 parts per million by weight
0.01 percent by weight
0.2 percent by weight
1.97 percent by weight
1100 parts per million by weight
0.3 percent by weight
0.01 percent by weight
12.3 parts per million by weight
23800 parts per million by weight
120 parts per million by weight
50 parts per million by weight
1.38 percent by weight
14 parts per million by weight
14 parts per million by weight
7 parts per million by weight
parts per million by weight
I parts per million by weight
2 parts per million by weight
1200 parts per million by weight
29 parts per million by weight
8 parts per million by weight
0.2 parts per million by weight
48 parts per million by weight
Map X,'- JSON KML
Data field
li—ppm
be—ppm
na—pct
mg—Pct
al—pct
P—Ppm
k—pct
ca—pct
sc—ppm
ti—ppm
V—Ppm
cr—Ppm
fe—Pct
co—ppm
ni—ppm
cu—ppm
zn—ppm
as—ppm
se—ppm
Y—Ppm
nb—ppm
mo—ppm
ag—ppm
sn—ppm
The analyses reported show Chromium at 50 parts per million by weight.
This was the highest level seen along the proposed ACP pipeline route.

. Geology along the proposed Atlantic Coast Pipeline (ACP) route
Extent
A spatial analysis of the 182 -mile proposed ACP route with the Geologic Map of North
Carolina (1985) shows there are nine segments, a total of 91 miles which the underlying geology
indicates a possible hazard from Chromium and other metals such as Arsenic. These metals
could become remobilized under oxidizing conditions when excavated sediment and/or rock dry -
out on the surface. In the case of Chromium, naturally occurring Cr(III) can be altered into the
water-soluble hexavalent chromium, Cr(VI) and enter the surface water or groundwater.
One of the two geologic formations that could pose a hazard is the CZmd —
Metamudstone and meta-argillite. These rocks have bedding plane and axial -planar cleavage,
and are composed of metasandstone, metaconglomerate, and metavolcanics rock. This formation
underlies the ACP proposed route from mile -9 to mile -12; mile -47 to mile -50; mile -52 to mile -
58, and mile -66 to mile -67, mile -69, and mile -71; and mile -73 and mile -74. All or parts of 21
miles of pipeline route are over the CZmd unit.
The other formation is a Coastal Plain unit called the Black Creek Fon-nation (Kb). Four
segments of the proposed route from mile- 103 to include mile- 107; from mile- 108 to include
mile- 116; from mile- 117 to mile- 123; and from mile- 13 8 to mile- 182 (terminus). All or parts of
69 miles of pipeline route are over the Black Creek Formation.
The proposed ACP route in North Carolina is 182 miles. Forty-nine percent of the
proposed length is over those two geologic units.
Backaround
Peer-reviewed scientific literature was consulted to establish criteria for selecting the two
geological formations. Vengosh and others (2016) discussed the origin of hexavalent chromium
in drinking water wells from Piedmont aquifers of North Carolina. The geologic map of his
study area is west of the pipeline route, but the same geologic information he used is the 1985
geologic map.
The CZmd in the Eastern Slate Belt (old term) is not subdivided. In the Western Slate
Belt (old term) the unit is divided in the CZmd2 — Cid Formation and the CZmd3 — Floyd
Church Formation. Both of these have the highest median and maximum Cr concentration
values in micro grams per liter ([tg/L) of Total Cr.

AMR
�03
saw- 629
CZmd
CZmd
FID 216
GEOL250—ID 154
GEOCODE CZma
BELT Eastern Slate Belt
BELT2 Eastern Slate l3eft
GROUP_ Metamorphic rocks
TYPE filetamorphic Rocks
FORMATION Metamudstone and meta-argillite
EON Proterozoic -Phanerozoic
ERA Later Proterozoic -Paleozoic
PERIOD Late Proterozoic-Camonan
ABS—AGE none
REF—NUIA none
LEG_NUM 2
Shape_Leng 35324.160113
Bedding plane and axial -planar cleavage
DESCRIP I cornrnon� interoedded with
metasandstone, metaconglomerate, and
metavolcanic rock
DESCRIP-2
. . . . . . . . . . .
01
!4& �a
�ps wk

CZMd
CZMd
FID H6
GEOL250 ID 2�;-_
GEOCODE CZr,,lC
BELT Eastern Slate Belt
BELT2 Eastern Slate Belt
GROUP— Metamorphic rocks
TYPE Metamorphic Robrs
FORMATION Metamudstone and meta-argillite 4
EON Proterozoic -Phanerozoic
ERA Later Proterozoic -Paleozoic
PERIOD Late Proterozoic-Cam.-nan
ABS—AGE none
REF—NUNI none
LEG—NUM 2
Shape_Leng 330390�-76097
Bedding plane and axial -planar cleavage
common: interoedded with
DESCRIP — I metasandstone, metaconglomerate, and
metavolcanic rock 0
DESCRIP-2
0
4
48
4
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A
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431
RW

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Amp -
AV
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CZmd
CZmd
FID 7519 f
GEOL250 ID 779
S
GEOCODE CZmd
IL BELT Eastern Slate Belt
BELT2 Eastern Slate Belt
GROUP Metamorphic rocKs
TYPE ttletamorphic RoO(s
FORMATION Metamudstone and meta-argillite
EON Proterozoic -Phanerozoic
ERA Later Proterozoic-Paloozoic
PERIOD Late Protero-,oic-Camrrian
ABS AGE none
REF—NUf,,l none on
LEG—NUM 2
Shape_Leng 181586.480115z
Bedding plane and axial -planar cleavage—
DESCRIP I cornrnon� interoedded with
metasandstone, metaconglomerate, and
m etavo I can i c ro cK
DESCRIP 2
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Kb
FID 1203
GEOL250 ID 1093
GEOCODE Ko
BELT Coastal Plain
BELT2 Coastal Plain
GROUP— Cretaceous
TYPE Sedimentary Rocks
FORMATION Black Creek Formation
e n anerozioc g -40
-90 EON P h
ERA 1"Iesozoic
C:;� t PERIOD Cretaceous
ABS—AGE none
REF NUIA none
LEG NUM 3
Shape_Leng 842336.239088
Clay, gray to black, lignitic, contains thin beds
V L and laminae of fine-grained micaceous sand
DESCRIP-1 and thick lenses of cross -bedded sand.
4k, Glauconitic, fossiliferous dayey sand lenses in
upperpart
DESCRIP 2
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Kb
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FID 1203
GEOL250 ID 1093
GEOCODE K".
BELT Coastal Plain
BELT2 Coastal Plain
GROUP Cretaceous
TYPE SeCimentany Rocks
0,
FOWATION Black Creek Formation x W
EON Phanerozioc
ERA Mesozoic
PERIOD Cretaceous
ABS AGE none
REF—NUM none 41
LEG—NUM 3 it
Shape Leng 842336.239088
Clay� gray to black, lignitic, contains thin beds
and laminae offine-grained micaceous sand 4P
DESCRIP-1 and thick lenses of cross-!)edded sand.
-sandlensesin
Glauconitic, fossiliferous dayey
upper part
DESCRIP-2
-k
Goo�le

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Kb
astoveO'
Kb
FID
1203
GEOL250
ID 1093
NZI
GEDCODE
K :
idsor
BELT
Coastal Plain
'S"
Coastal Plain
WABELT2
GROUP—
Cretaceous
TYPE
Sedimentari RocKs
PnP1,AATIC)N
P112rirrlraak-97n�mfinn
T,
ABS—AGE none
REF—NUNI none
LEG—NUM 3
Shape_Leng 842336.239088
Clay, gray to black, lignitic, contains thin Oeds
and laminae of fine-grain�d micaceous sand
0", DESCRIP 1 and thick lenses of cross -bedded sand.
-sandlensesin
Glauconitic, fossiliferous dayey
upper part
DESCRIP-2 0
�j
74 -
It th
c or
astoveO'
NZI
idsor
'S"
ABS—AGE none
REF—NUNI none
LEG—NUM 3
Shape_Leng 842336.239088
Clay, gray to black, lignitic, contains thin Oeds
and laminae of fine-grain�d micaceous sand
0", DESCRIP 1 and thick lenses of cross -bedded sand.
-sandlensesin
Glauconitic, fossiliferous dayey
upper part
DESCRIP-2 0
�j
74 -
It th
c or