20170359 Ver 2_Turbidity Testing Version 2.0 (005)_20191112

10/25/19 Version 2.0
Hazen and Sawyer Grandfather Golf & Country Club
Grandfather Golf & Country Club Loch Dornie Dredging Operations Turbidity Monitoring
Field Procedure:
1.Turbidity sampling (grab sample tested onsite via calibrated metering device) will be employed
prior to and during dredging operations—see Schedule.
2.OnesamplewillbetakenupstreamofdredgingoperationswheretheLinvilleRivercrossesfairway
17 at sample station A (see map).
3.One sample will be taken downstream of Loch Dornie, downstream of the confluence of the
release pipe channel and the spillway overflow channel at station B (see map).
4.Weather description at time of sampling will be recorded (e.g., temperature). Values of turbidity
and weather conditions will be tracked and graphed.
Benchmark and Response Actions:
1.If the downstream sample site turbidity is 10 NTU or less*, dredging may continue.
2.If the downstream turbidity is the same as or lower than the upstream turbidity (e.g., 15 NTU
enters, 15 NTU leaves), dredging may continue.
3.If downstream site measurements exceed conditions under #1 or #2 above, active dredging is to
cease until condition #1 or #2 are met again; erosion control measures (e.g., turbidity curtains)
are to be examined for correct operation.
Schedule:
1.Testing at locations A and B shall be daily,on dredging operation days, defined as days when
machinery actively operates, moving soil or dredge material, below the pre-drawdown water
surface elevation.
2.Testing is to begin prior to dredging operations by oneweek, minimum, to establish a“baseline;”
see #2 under “Benchmark and Response Actions” above.
10/25/19 Version 2.0
Hazen and Sawyer Grandfather Golf & Country Club
3.If conditions #1 or #2 under “Benchmark and Response Actions” can be demonstrated for one
calendar week, then testing may be relaxed to three times a week (e.g., Monday, Wednesday,
Friday).
4.If conditions #1 or #2 under “Benchmark and Response Actions” can be demonstrated for two
calendar weeks, the testing may be relaxed to once a week.
5.Violations of #1 or #2, as applicable, under “Benchmark and Response Actions” during “relaxed”
timeframes will re-impose daily testing requirements.
*from 15A NCAC 02B .0211 FRESH SURFACE WATER QUALITY STANDARDS FOR CLASS C WATERS: (21)Turbidity: the
turbidity in the receiving water shall not exceed 50 Nephelometric Turbidity Units (NTU) in streams not designated as
trout waters and 10 NTU in streams, lakes, or reservoirs designated as trout waters; for lakes and reservoirs not
designated as trout waters, the turbidity shall not exceed 25 NTU; if turbidity exceeds these levels due to natural
background conditions, the existing turbidity level shall not be increased. Compliance with this turbidity standard can
be met when land management activities employ Best Management Practices (BMPs) [as defined by Rule .0202 of this
Section] recommended by the Designated Nonpoint Source Agency [as defined by Rule .0202 of this Section]. BMPs
shallbe in full compliance with allspecifications governing the proper design, installation, operation, and maintenance
of suchBMPs