WQ0018708_New Spray System_20010515

DIVISION OF WATER QUALITY
GROUNDWATER SECTION
May 15, 2001
MEMORANDUM
To: Kim Colson
cc: Art Barnhardt, GWS-RO
Through: Debra Watts �1
From: David Goodrich
Subject: Lake Creek Corporation / Bay Tree Lakes
Bladen County
WQ0018708/GW00136
4 r I I3GC7 1'i';vGC f
el
1
The Groundwater Section is in receipt of the subject application to permit a new spray irrigation
treatment system for the treatment of domestic wastewater from the Bay ITree Lakes subdivision in
Bladen County (see Figures 1, 2, and 3): The proposed system will treat approximately 40,000 gallons
per day of domestic wastewater and spray irrigate the treated effluent onto approximately 5.08 acres of
vegetated application area (see Figure 2). The existing wastewater treatment system which currently
serves the subdivision treats 20,000 gallons per day by extended aeration) and discharges the treated
effluent to a nearby swamp area as per an existing NPDES permit. There is presently an unlined sludge
holding area which is scheduled to be removed as part of the installation of the new treatment system.
The proposed system will treat the existing 20,000 GPD flow, phis an additional 20,000 GPD
from an expansion, and has no.discharge to surface waters. The attributes of the new system will include
extended aeration, a new chlorine contact chamber, and 24-hour storage prior to spray application. The
proposed system will have a new storage lagoon which will be lined with natural clay. There are no
water supply wells situated in the vicinity of the treatment system or the spray irrigation area.
As part of determining the suitability of the site to treat the proposed loading, a mounding study
was performed by the applicant's consultant. The study consisted of a computer simulation which used
preliminary site data as input to determine the potential for mounding beneath the sprayfield area. The
simulation indicated that the mound produced by the spray irrigation would! rise to within.1.5 feet of the
ground surface after 200 days of continuous spray application under the most severe (highest) seasonal
water table conditions. The original application package did not contain ;the required hydrogeologic
report, and more than nine months were required for the applicant to perform further field investigations
and furnish the report. The Groundwater Section performed a mounding simulation using the more
detailed hydrogeologic information in the report and a computer program developed by Colorado State
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University (CSUPAWE). The results of our simulation indicated that the mound produced would rise to
within six inches of the ground surface after 360 days of continuous spray application and highest
seasonal water table conditions. It should be pointed out that both of the computer simulations assumed
worst case groundwater elevation conditions which will not be sustained throughout the year.
In view of the relatively high mounding potential predicted by the computer simulations and the
potential for groundwater impacts caused by the storage lagoon, the Groundwater Section recommends
the installation and monitoring of several shallow monitor wells. It is the understanding of the
Groundwater Section that four shallow monitor wells (MW-1, MW-2, MW-3, and temporary well MW-
4) have already been installed by the applicant at locations acceptable to 'the Groundwater Section staff
of the Fayetteville Regional Office (see Figure 3). The Groundwater Section; further recommends that a
fifth monitor well (MW-5) be installed immediately adjacent. to the storage lagoon at a location
acceptable to the Groundwater Section staff of the Fayetteville Regional Office. Monitor Wells MW-1,
MW-2, MW-3 and MW-5 should be sampled prior to starting the system, and thereafter every March,
July, and November for Water Level, pH, Chloride, Total Dissolved Solids, Nitrate Nitrogen, Fecal
Colifonns, Total Phosphorous, Total Organic -Carbon, and Total Ammonia J Temporary Monitor Well
MW-4 should have its measuring point elevation surveyed and its water level measured concurrently
with the four other wells to confirm the direction of natural groundwater flow prior to its abandonment.
This well should be properly abandoned to minimize the risk of groundwater contamination prior to
operation of the spray system.
The Groundwater Section has reviewed the subject new permit application and recommends issuance of
the pen -nit with the following conditions:
1. Well Construction / Abandonment Criteria:
a. *Prior to beginning waste disposal operations, a fifth monitor well, IrW-5, shall be installed to
monitor groundwater quality immediately adjacent to the storage lagoon. The well(s) shall be
constructed such that the water level in the well is never above ,or below the screened (open)
portion of the well at any time during the year. The location, of the monitor well must be
approved by the Fayetteville Regional Office prior to construction. The monitoring well shall be
constructed in accordance with this permit and approved by the Fayetteville Regional Office.
b. The well(s) must be constructed by either a North Carolina Certified Well Contractor, the
property owner, or the property lessee according to General Statutes 87-94.4(b)(2). If the
construction is not performed by a certified well contractor, the property owner or lessee
must physically perform the actual well construction activities, and the well(s) must be
constructed according to the North Carolina Well Construction Standards (15A NCAC 2C
.0108) and the local county rules.
c. *Prior to beginning waste disposal operations, Monitor Well MW-4; shall have its water level
measured concurrently with the other four monitor wells, have the elevation of its measuring
point surveyed, and shall then be permanently abandoned. Within thirty (30) days of
abandonment, a Well Abandonment Record (GW-30 form) shall be completed for each well
abandoned and mailed to the address listed in the "Reporting / Documentation" section of
the Groundwater Requirements. The well(s) must be abandoned, by either a North Carolina
* This wording differs from that of the shell document.
Page 2 of 5

Certified Well Contractor, the property owner, or the property lessee according to General
Statutes 87-94.4(b)(2). If the abandonment is not performed by a certified well contractor, the
property owner or lessee Must physically perform the actual well abandonment activities and
the well(s) must be abandoned according to the North Carolina Well Construction Standards
(15A NCAC 2C .0113) and local county rules.
d. • The Fayetteville Regional Office, telephone number [phone], shall be notified at least
forty-eight (48) hours prior to the construction of any monitoring well so that an inspection can
be made of the monitoring well location. Such notification to ithe regional groundwater
supervisor shall be made during the normal office hours from: 8:00 a.m. until 5:00 p.m. on
Monday through Friday, excluding state holidays.
e. Within thirty (30) days of completion of all well construction activities, a certification must be
received from a professional engineer or a licensed geologist certifying that the monitoring
well(s) [are / is] located according to this permit.
2. Sampling Criteria:
a. Monitor well(s) MW-1, MW-2, MW-3, and MW-5 shall be sampled! initially after construction
and prior to waste disposal operations, and thereafter every March, Ju1y, and November for the
parameters listed below. Prior to sampling the parameters, the measurement of water levels must
be taken. The depth to water in each well shall be measured from the surveyed point on the top
of the casing. The measuring points (top,of well casing) of all monitoring wells shall be surveyed
relative to a common datum.
Water Levels pH
Chloride Total Dissolved Solids
Nitrate Nitrogen Total Organic Carbon
Total Ammonia Total Phosphorous
Fecal Coliform
b. For TOCs, if concentrations greater than 10 mg/1 are detected in any ;down -gradient monitoring
well, additional sampling and analysis must be conducted to identify'the individual constituents
comprising this TOC concentration. If the TOC concentration as measured in the background
monitor well exceeds 10 mg/1, this concentration will be taken ito represent the naturally
occurring TOC concentration. Any exceedances of this naturally occurring TOC concentration in
the down -gradient wells shall be subject to the additional sampling and analysis as described,
above.
c. Any laboratory selected to analyze parameters must be Division !of Water Quality (DWQ)
certified for those parameters required.
3. Reporting / Documentation:
a. All reports and documentation (GW-1, GW-30, GW-59) shall be mailed to the following
address:
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Groundwater Section
Permits and Compliance Unit
1636 Mail Service Center
Raleigh, NC 27699-1636
Updated blank forms (GW-1, GW-30, GW-59) may be downloaded from the Groundwater
Section's website at http://2w.ehnr.state.nc.us/ or requested from the; address mentioned above.
b. For the initial sampling of the well(s), the permittee shall submit a copy of the GW-1 Form (Well
Construction Record) with the Compliance Monitoring Form (GV(59) for each well to the
address listed in the "Reporting / Documentation" section of the Groundwater Requirements..
Initial Compliance Monitoring Forms that do not include copies of the GW-1 form may be
returned to the permittee without being processed. Failure to submit; these forms as required by
this permit may result in the initiation of enforcement activities purstiant to NC General Statutes
143-215.6A.
c. The results of the sampling and analysis must be received on Fo'nn GW-59 (Groundwater
Quality Monitoring: Compliance Report Form) by the Groundwater Section (address listed in the
"Reporting / Documentation" section of the Groundwater Requirements), on or before the last
working day of the month following the sampling month. The data of all groundwater sampling
analyses required by the permit conditions must be reported using the most recent GW-59 form
along with attached copies of the laboratory analyses.
d. Within sixty (60) days of completion of all monitoring well(s), the permittee shall submit two
original copies of a scaled site map (scale no greater than 1 "=100'); however, special provisions
may be granted upon prior approval for large properties. The map(s)Imust be signed and sealed
by a licensed land surveyor that indicates the following information:
1) The location and identity of each monitoring well.
2) .The location of major components of the waste disposal system;
3) The location of property boundaries within 500 feet of the disposal area(s).
4) The latitude and longitude of the established horizontal control monument.
5) The relative elevation of the top of the well casing (which shall be known as the "measuring
point") relative to a common datum.
6) The depth of water below the measuring point at the time the measuring point is established.
7) The location of Review and Compliance boundaries.
Control monuments shall be installed in such a manner and made ;of such materials that the
monument will not be destroyed due to activities that may take place' on the property. Maps and
any supporting documentation shall be sent to the Groundwater.Section as addressed in the
"Reporting / Documentation" above.
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4. Vertical Separation Requirements:
a. For domestic wastewater:
Waste application activities shall not occur when the vertical separation between depth of
application and the water table is at less than one (1) foot. Verification of the water table
elevation can be confirmed by water level readings obtained from the monitor well(s) near the
site or auger boring(s), which must be done within 24 hours, prior to application of wastewater.
Any open borings must be properly filled with native soil, prior to application to decrease the
chance of any waste contaminating the groundwater.
5. Liner Requirements:
The lagoon shall have either a liner of natural material at least one; (1) foot in thickness and
having a hydraulic conductivity of no greater than 1 x 10' c;entimeters per second when
compacted, or a synthetic liner of sufficient thickness to exhibit structural integrity and an
effective hydraulic conductivity no greater than that of the natural material liner, according to
15A NCAC 2H .0219(f).
6. Applicable Boundaries:
a. The COMPLIANCE BOUNDARY for the disposal system is specified by regulations in 15A
NCAC 2L, Groundwater Classifications and Standards. The Compliance Boundary for the
disposal system individually permitted after December 31,1983 is established at either 250 feet
from the waste disposal area, or 50 feet within the property boundary, Cwhichever is closest to the
waste disposal area. An exceedance of Groundwater Quality Standards at or beyond the
Compliance Boundary is subject to immediate remediation action according to 15A NCAC 2L
.0106(d)(2).
b. The REVIEW BOUNDARY is established around the disposal systems midway between the
Compliance Boundary and the perimeter of the waste disposal area. Ariy exceedance of standards
at the Review Boundary shall require action in accordance with 15A!NCAC 2L .0106(d)(1).
7. Additional Requirements:
Any additional groundwater quality monitoring, as deemed necessary by the Division, shall
be provided.
If there are any questions please call David Goodrich at [phone].
Page 5 of 5

•
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SCALE IN FEET
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TREE LAKE
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100
FIGURE 1
LAKE CREEK CORPORATION - BAY TREE LAKES
SPRAY IRRIGATION SYSTEM
BLADEN COUNTY
• cs1
WQ0018708/GW00136
7
SITE LOCATION MAP
X' rossr

IIL7. FTNSN SPOT ELEVATION
OO DST. SPOT ELEVAMW
- nms,1 CONTOUR
-- DUST. CONTOUR
— PROPERTY lNE
— CASTING R/K
a FIST. SVaTART SEMEN 11/1(0IOIE
- EIST, STORY DON
- MST. DITCH OR SHALE
DIST. POWER POLE - - — PAVER LNE MON POKE
— ME1F DITCH 00 SHALE - -
--ONERSKHURY SHALE -
- SILT FENCE
RW-PAP
NOCK CHECK Du..
- DENU0E0 LNKIS
y. Ti[w FORCE MAN M/FRTNOS
UMW LOCATION
- K[M Mu, SUCTION
2 KW STRUCTURES
?EST HELL
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LOCATION MAP
NO SCALE
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SCHEDULE OF PLAN SHEETS
SHEET NO.
DESCRIPTION
GENERAL SITE PLAN
1
2
TREATMENT SITE PLAN •'
3
FLOW SPUTTER CHLORINE CHAMBER DETAILS
4
EXISTING 20,000 GPD AERATION UNIT & NEW 20,000
EXPANISION UNIT DETAILS
5
PUMPING STATION -
6
SPRAY IRRIGATION FIELD -
7
LAGOON OUTLET BOX DETAILS
- 8- --
DETAILS - —
Ce4A NAGA
• - iit4Mp�.O
GENERAL SITE PLAN
GENERAL NOTES:
1. SEE SHEET #6 FOR SPRAY IRRIGATION
LEGEND.
2. SEE SHEET #2 FOR DETAIL OF TREAT1AE'
SITE AREA.
FIGURE 2
LAKE CREEK CORPORATION - BAY TREE LAKES
SPRAY IRRIGATION SYSTEM
BLADEN COUNTY
WQ0018708/GW00136
SITE DETAIL MAP

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ot,
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MW #2
Monitoring Well M
(CI, TDS, NO3-N, NH4-N)
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MW #1
of
-5.08 Acre Spray Field
orage (unlined
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it
'FIGURE 3
LAKE CREEK CORPORATION - BAY TREE LAKES
SPRAY IRRIGATION SYSTEM
• BLADEN COUNTY
WQ0018708/GW00136
SITE DETAIL MAP