WQ0002284_Staff Comments_20020321

DIVISION OF WATER QUALITY
GROUNDWATER SECTION
March 21, 2002
TO: Debra Watts, Groundwater Section, Permits and Compliance Unit
v
THROUGH: Wi ie Hardison, Groundwater Regional Supervisor
FROM: onrad J. Welti, L.G., Hydrogeologist
SUBJECT: Non Discharge Permit Modification
Kinnakeet Shores Subdivision - Water Reuse of Reclaimed Water
Dare . North Carolina
200200 GW02027
The Washington Regional Office has reviewed the application for permit modification which
was submitted to the Regional Office on February 20, 2002. After review of the submitted information
and the file, the following comments are for your consideration.
1. The subject site is located in Dare County, Avon Township on the outer banks. Figure 1 presents a
General location map of the area and Figure 2 presents a USGS Topographic map of the site.
2 Kinnakeet Shores (KKS) current permit allows for the operation of a 50,000 GPD extended aeration
WWTP with a rotary distribution disposal system consisting of two (2) 80 ft. rotars. The permit also
allows for the construction and operation of a new 220,000 GPD extended aeration WWT? to include
four (4) 100 ft. rotars.
3: Groundwater requirements for the existing permit indicate that monitoring wells MW-1,2,3 and 4 shall
be sampled every February, June and September for the following pararmeters:
Water Levels pH Fecal Coliforms NO3
Chloride TDS TOC Ammonia Nitrogen
VOCs in November Only.
4. In approximately summer of 2000, the USACE used the subject site to deposit dredge spoils from the
sound. During that process a portion of the site near the rotars was burried in sand along with a few of
the monitoring wells. New monitoring wells (MW5, 6, 7, 8 & 9) were installed to replace the damaged
or destroyed wells at the site. Groundwater comments from the regional and Central Office indicated that
the permittee was to begin sampling the new wells. Figure 3 is a map submitted by the consultant
indicating well locations and a new complance and review boundary which corresponds to the existing
rotors. Previous maps showed monitor well locations and compliance and review boundaries positioned
anticipating 4 rotars, of which only 2 were ever constructed.
5. A review of compliance monitoring data indicates gaps in submittals and data entry. For the historical
data available online (1988-1998) graphs were constructed to evaluate trends in monitored parameters.
The permittee responded to a request in 2000 for missing GW59 data for 1998 and 1999. Monitoring
data was received for all of 1998. None of the 1999 data could be located and was likely due to the
dredging operation and a change in ownership and management of the WWTP. Graphs indicate water
levels are mounding at the site, particularly for monitor wells MW2, 3, and 4. TSS is elevated for MW 1
and MW4. TDS for wells MW i and MW2 at or near regulatory levels. For MW3 and MW4 TDS is at
or above regulatory levels. NO3 was elevated for monitoring wells MW1, MW2 and MW3

Debra Watts Memo
Kinnekeet Shores
March 21, 2002
Page Two
approximately during the time of 1995 to late 1997 and then recovered. See attachment 1 for data and
graphs. The WWTP, as of a year ago is under new management (EnviroTech) and significant
improvments have already been made in the operation and maintanence of the facility.
6. The applicant has proposed to increase the volume of wastewater to 350,000 GPD and take on new
waste sources from strip malls. The make-up of the waste is reported to be 90% domestic and 10%
Commercial (waste characterization and types of businesses needed). The facility is described as having
dualized extended aeration tertiary wastewater treatment - reclaimed water for residential irrigation.
Chlorination will be replaced by dual ultra -violet disinfection and a turbidimeter which activates valves
to divert effluent form irrigation pond to a non -compliant pond in the event there is a reduction in
effluent quality. Reuse.quality effluent is defined in 2H .0219(k)(l)(A)(iii) as the following: A monthly
average TSS Qf less than or equal to 5 med and a daily maximum 7-SS of less than or equal to 10 m9/1
monthly geometric mean fecal col;form level ofless than or equal to 14/100 ml and a daily maximum
fecal coliform Qflays than or equal to 251100 mk a monthly average BODS ofless than or equal to 10
med and a daily maximum NH3 of less than or equal to 15 mZd: a monthly average NH3 Qf less than or
Pg3�al to 4 mgd and a dai4v maximum NH3 9fle_cs than or equal to 6 ma
7. A determination is needed as to if this site will be held to "industrial \ commercial" in the strictest
since. If held to industrial commercial, the vertical seperation requirement of 3' will likely not be
possible across much of the site.
8. The applicant has discussed various disposal methods for the tertiary treated "reuse quality" water.
Treated waste which is compliant with the definition of "reuse" will be placed in a storage pond (the
southern most pond in the proposed group of 3 new ponds - Figure 4) for later irrigation on the common
areas of the community. For non -compliant wastewater, either a "5-day upset pond" (the northernmost
pond on the air photo - Figure 4) will he constructed or the two existing rotors will be used to dispose of
upset water. Figure 5 is of the immediate WWTP area. The applicant needs to commit to one or the
other and present the application package as such. Regulations (2H .0219 (k)(1)(A)(v) state that
!1�67uent from the. treatment fa .ility shall be. dischaa = to ,five-day if side -stream detention pond
either the turbidity exceeds 10 NITI or if the -fecal colarm levels cannot he met. The fa .il 'v must have
the ability to return the ejjluent back to the treatment facility or otherwise meet the uent r uirementc
prior to dzccharge to the ' '_ Ion Woad „ use of the two existing rotors or an unlined upset pond would
be considered after modeling and an adequate proposed groundwater monitoring program.
Finally an infiltration pond is also planned as presented in Figure 4 and located between the "5-day
pond" and the next pond to the south The infiltration pond is proposed to operate at 1.49 GPD/SF
which is below the 1.5 GPD/SF "High Rate" classification.
9. Regulations [2H .0205 (d)(1)(5)(E)] require that a hydrogeologic study and soils description be done
for systems with design flows over 25,000 gpd. 2H .0219 (d)(1)(5)(F) requires a determination of
transmissivity and specific yield of the pcgnf ed aquifer based on withdrawal or recharge test.
Although a hydrogeologic report (completed in 1986 as a part of the original permitting effort) was
submitted with this current permit application, this office believes that in light of the alterations at the
site to include three (3) proposed ponds (57day, infiltraton and storage), in addition to a ditch around the
infiltration pond which is planned to alleviate mounding (Figure - 4) it would be wise to remodel that
specific area around the new ponds..

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Name: BUXTON Location: 035.3395966° N 075.5175267' W
Date: 3/21/102 Caption: Kinnakeet Shores Subdivision
Scale: 1 Inch equals 1666 feet Dare County WQ0002284
Copyiieht (c) 1997, "tech, ir,c

LJLL011IOU Dru IM; PAGE 62

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j GROUNDWATER SECTION
DIVISION OF ENVIRONMENTAL MANAGEMENT
RECORD OF WASTE DISPOSAL PERMIT APPLICATION REVIEW
Z
G W # �
REVIEW DATE FIELD INVESTIGATION? (Y/N)
FACILITYNAME
NAME COUNTY �Q�
SIZE OF IMPOUNDMENT (FT. SQ.) V &�'UR SIZE OF APPLICATION AREA D
WASTE SOURCE: MUN. SLUDGE N. VI�WATE . PRIMARY SECONDARY TER Y
IND. SLUDGE —IND. WELL WATER ---OTHERS:
DISTANCE FROM WASTE SOURCE TO NEAREST: STREAM IZdo FT., WELL / add .rj
FOR WELL: TYPE OF USE &bt4-� DEPTH t S PUMP RATE (EST.) ,,,�,� c`` `"
WHAT DESIGN CONDITIONS WILL REDUCE/INCREASE CHANCE OF GW CONTAMINATION:4, ��-
���ii�wdi�w
WHAT NATURAL SITS CONDITIONS WILL REDUCEIINCREASE CHANC60F GW CONTAMINATION:
DEPTH TO: BEDROCK �sf / f`�U FT., SEASONAL HIGH W.T. — 3 FT., ANNUAL W.T. FLUX 7 FT
SURFICIAL AQUIFER BEDROCK/ARTESIAN AQUIFER
GEN. LITHOLOGY
HYD. COND. / 7 FTJDAY ❑ MEASURED �— MEASURED
[ESTIMATED FTJDAY
�j THICKNESS ZeQ '� FT. ESTIMATED
NO. OF MONITER WELLS: PROPOSED: UP — DOWN' ; EXISTING: UP / DOWN_
FROM WORKSHEET: SITE NUMERICAL DESCRIPTION=—
_ T 1 2 3 4 5 6 6A • 66
SITE GRADE (HYDROGEOL) = SITUATION GRADE= *41#� �
PROPOSED SAMPLING SCHEDULE & PARAMETER S):
�/ i /i/1 G�,�iL,o.c'�"('1 / /�1J/irL, no.��Ga.�� /1�i1_ i�. �.•.•�., _ A/- L- - - 'TJ7 c T .- DU n / T .+ . _ . i .
HAVE THERE BEEN ANY EXCEEDANCES OF THE GROUNDWATER STANDARDS? YES ✓ NO ✓ C o� . r,
HAS ANY ENFORCEMENT ACTION BEEN TAKEN? YES NO DATE OF ACTION:
BRIEF SUMMARY OF ENFORCEMENT ACTION TAKEN: — eg'v
REMARKS/ RECOMMENDATIONS (Continue on reverse, if necessary):
GVJ-48 Revised04/94 HYD. REGIONAL SUPERVISOR

— — — rGnlYll 1 r-►rrLILH 114 HEVIEW WORKSHEET
Focry ! X tav
Coun :
R
d L OZ-7
Revlewef ; 4/ / -
Deterrrdne the
Potry value 0 1 3 4 5 .6 7 8
on ground between corn
tomtr�fon nova and Didonce in 27CD+ 3a� 75- 149 9 1 �Q
water supply (woo or meters 1000 - 20M 150- 299 50 - 74 - � 20.34 10 - 19 0 - 9 Datarne P1. Value
stream'), Dhiance n 6200+ 1001-31M 251 -500 101 - 160 31- t0 (Stec 1}
feet 3100-62M 501-Iom 161- 250 61-100 0-30
�-' if wader tableh pem»abie bedrock pt. Value .,6; lnPaahty P"", bb bedrock
S102_i POint vakx 0 1 2 3 4 5� 6 113"64 7 8 9
Estivate the depth Meters
to the water table + � 20 20 12-29 r�1l 5-7 3-q 15 25 5-1 —+!z
91-200 61-90 0 Pt. Value
below base of corn Feet �+ 36�0 26-35 16-25 Down ^
9-lb 3-E 0-2 0 (Step 2)
torn a V=aflon sauce ii�r a u u1 - P., _4, �y �Sh`li' L
more than 5 7G of O
the year.
Slog 3 PC& vot n
J
Estknate water WoOerlcbb Grodbrtf l 4 5
table gradient �1*M and Gn than
nt law than
Grodsrt Grodnrns Gradert Pt. Vakrr.
kornc�omh- a water
53t lesthion lesthan greater greater (Step 3)
ation site Low cllreCion o9 water tit 2 percent 2 percent ttrart 2 than 2
suppfies that toward towoed percent Percent
am closer wader water toward toward
thcn 1000 XlPpy but supply water water
meters not the ondkthe supply wpPty
anticipated anticpated bU not and Is the
direction of direction of the anti- antic#=.ed
flow now cipated direction
diredbn of How
Of flow
Stop 4
Est&Cde of
permeabi@ty-
sorption for the Cbywah Cie :rt
waste disposal sae. no more Sand with Sand with gravel or
that 5D S. 15 - 30 % lea than on coarse
OJ A Row - Rock > 4A 100 Clay sand cay 15 %day sand
feet belowre Moth = 30 I DA VJ 2A nd smd
leMore than I Mothan 95
surface I) I P) I' I I I" i l 1 11 I I I I 11
m 25-29 OB 1C 1D 2F 3✓: ' 4G 5F 6E 7F be 9G 9M
(3)1 cokarvi - bedrock i 20-24 CC 2C lE 3D 4 D 75 - 9d
poorly Ui € SE 5G 6F 7G SF 9H 9N 60 -74 LL
z
P LL <" 15-19 OD 35 1F 4C 4E 6C 5H 7D 7H 67 91 � 46-59 c
Y�3 10-14 OE 48 2D 5B 4F 6D 51 TE
Z m 71 9D 9J q+' 28 - 45 z
(4) a aor rim - bedrock - � O C
mt:lWey U U �, 3 9 iB 6B 2E 78 5C 7C Si 9D 7.1 PE 9K 9C 10-27 =
orveryO Leathan3 1B 58 3C 8C SD Peru -able 9B 5K 9C 7K 9F 9L 9R
Less than 1
Bedrock at laid mirfoce; I = SZ I I a 9Z
Zi2l
Note: K Bedrock at land surface, toe 10 (ptks appropriate letter) Category
(Step 4)
Degree of confidence In accuracy of vokres A = very confidert
B = told corddent
C -wah low corWance Confidence
Sioo dA (Step 5)
Point of concem wah regard to cortcn*K rd same k : W . new by wet
S = spMg / stre om FS
8 - Perimeter of compiance Pclrt of Concern
222 69 A Udionol OuoMer (C7rc* Only One) (S►eP 6A)
D - Cane of depression of r»orby pumping wet has. M rtrnndng trrdersre hlgnly Ikety ��
or wa l kety. nfk»nce c z din xx t now
P =Sae has �Yer
E - Dstknce In St from Step 1 based on se Poor Percolation potemd lu (vae cK 3 or less n Step 4) (SIeP 65)
conton*xzd game rather than poet sourceQ . Wcee source In groundwater recharge urea
F . Waste source In groundwater dbcharge area, T. Water table in very tVgtyy froch>:ed or cavern z rock
thus mnknal groundwater cordamirritlon at depth / distance
Y. Slle underlain by i or more arteran oqutfers
K =Area sncbrbin by coverers Irneslone

�IASTE DISPOSAL PERMIT APPLICATIC
,REVIEW WORKSHFET (CONT.)
AUZM i
Sfte ...� desuO>ton .
Told Step I Slsap 2 stop J Slop 4yy7
p 5 Step 6A Step 68
( Add Steps 1- 4 (Omlt kMea) )
Site Grade Based on Hyd ogedop1, Paramr+ters
2=8
Hurd Potential Nt ttpr ldennMer (HPM
(Chccse One)
G
B H +
A C F
HPtA
(1)NumericalStte Total Perm/Sorp. MPM
Description (from Step 7 )
C1) PAR VALUE (stage J)
SITUATION RATING : (1) - C2)
(table below)
SITUATION GRADE
no moax:a pra '
(see table below)
SITUATION GRADE
sire mo carroru
(see table bebw)
SITUATION RATING TABLE
To be used for Step 9 (Natural) and Step 10 (ModlAed )
SITUATION RATING tstep 10)
( Combined Value) PROBABLrry OF SITUATION
CONTAMINATION DEGREE OFACCEPTABILITy GZA E
8 or iwa
ProbabNaoCev�bb A
Robcbty a=ep abb or g
-3 to 43 9 Mcvhob ux v cbb
Acoeptonce u-cart; h C
+4 to+7 Probably
Ambobtyuxx::aploble D .
+8 or more VOryProbobis Abe � a-�" ePtot�e
unacceptabie F
The probabtlty of contamonynatIon from ruo6oru
sansfactorly. Therefore. flits range of values rephaving resented values between t 7 and - 7 is arcutt to categome
by grades B and C. b destined orgy by a question mark
Acceptarnce or rejection of oa site for the Intended purpose it a responsbllty of the particular rsg&ctory agency
may depend on special requirements of the agency or on f9as bi9ty and execution of opproved
eand ngheerhg of 0 site ( Stage 4 )•