20031023 Ver 1_Technical Memo_20030623

116?
Kimley-Horn
and Associates, Inc.
May 2, 2003
Mr. Rick Shiver
NC Division of Water Quality
127 Cardinal Drive
Wilmington, NC 28405
Re: Martin Marietta Materials
Rocky Point Quarry
Ground Water Monitoring Report
Dear Mr. Shiver:
r1,
P.O. Box 33068
Raleigh, North Carolina
27636.3068
Enclosed please find a copy of the April 30, 2003 Technical Memorandum
regarding the Hydrologic and Hydro-geologic monitoring associated with the
Rocky Point Quarry mining operation. The memorandum includes data through
April, 2003.
I would like to suggest that a meeting be arranged in the near future to discuss the
accumulated data and the future pumping plan for the quarry. Please review your
calendar and either Jim Eisenhardt or I will contact you soon to arrange for a
meeting.
Please advise if you have questions.
Very truly yours,
KIMLEY-HORN AND ASSOCIATES, INC.
Harlan K. Britt, P.E.
Associate
Cc: Horace Willson
Jim Eisenhardt
Chad Evenhouse
Bruce Cutright, P.E.
¦
TEL [phone]
FAX [phone]
VK
C]_" Kimley-Horn
and Associates, Inc.
T e c h n i c a l M e m o r a n d u m
Date: April 30, 2003
Project: MARTIN MARIETTA AGGREGATES, Rocky Point, NC
Subject: Quarterly Report Hydrologic and Hydrogeologic Monitoring
1. Introduction and Purpose
The U. S. Army Corp of Engineers has directed Martin Marietta Aggregates at their Rocky Point
Quarry location, to investigate and monitor the surface water, shallow groundwater and deeper
groundwater on and surrounding the quarry area. Of particular interest is the potential impact of
their dewatering activities on the nearby wetlands, shallow and deep groundwater systems. At the
request of Martin Marietta Aggregates, Kimley-Horn and Associates have established a
monitoring network to address the U.S. Army Corp of Engineers concerns. The monitoring
network includes stream gauges, shallow monitoring wells, deep monitoring wells, and records of
quarry dewateri ng operations. Rainfall data is acquired from a nearby NC State Climate Office
weather monitoring station (Horticultural Crops Research Station, Castle Hayne, NC) as well as
an on-site monitoring point.
This technical memorandum presents the quarterly monitoring report compilation of data.
H. Monitoring Methods and Systems
The monitoring gauge installation was completed in September 2002 for both the groundwater
and surface water monitoring locations. Data from the gauges are downloaded by Martin
Marietta Aggregate staff on a monthly basis. Kimley-Horn and Associates staff performs
periodic site inspections and maintenance as needed for each of the data logger instruments.
These maintenance visits occur as needed, but generally on a monthly or bimonthly basis. Well
maintenance occurred in mid to late November to redevelop the wells and remove accumulated
fines that had migrated through the well screens. The field notes documenting the maintenance
and monitoring procedures are included on the attached figures.
1. Climatology and rainfall
An on-site rain gauge was installed adjacent to the active mine pit at the beginning of
this study. Manual rainfall data is also collected at the scale house near the mined
entrance. Rain gauge data is incomplete during the monitoring period. The rain
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gauge was damaged due to vandalism and the local rainfall data was lost. The
manually collected rainfall data from the scale house area is included in the attached
figures.
2. Shallow Water Table Monitoring
Shallow water table monitoring points, including monitoring wells and piezometers,
we installed at eight (8) locations in September 2002. The purpose of the shallow
gauges was to compare the local surface hydrology with the shallow water table.
Information collected from the shallow water table monitoring wells and piezometers
is included in the attached figures.
3. Deep Groundwater Monitoring System
The deep aquifer and overburden monitoring points were installed to an average
depth ranging from 22' to 33'. The purpose of these wells was to provide
information on the water table within the overburdened and production zone for the
aggregate mine and to be able to compare the water levels within these units to the
shallow water levels monitored by the shallow monitoring system. The attached
figures present the data collected from the deep aquifer monitoring wells.
4. Stream Water Level Gauges
Two stream level gauges were installed for the monitoring program. They are
located at monitoring locations 3, the unnamed tributary to Strawberry Branch, and
monitoring location 8, which is located at Strawberry Branch downstream from the
unnamed tributary. The gauges are pressure trandusory units similar to the
groundwater monitoring well instrumentations. Pressure units are suspended within
PVC casing open at the bottom to the stream depth. The intent of these data
collection points is to provide information for comparison to water flow fluctuations
in the shallow system, in the deep system, and with the pumpage records from the
mined dewatering activities.
5. Mine Dewatering
A monthly summary of pumping rates from the mine pit is included as attached
figures M through N. The actual pumping rate varies, but the total quantities of water
withdrawn from the pits is tabulated by Martin Marietta material staff. The methods
for these calculations are presented in a letter from Mr. Steve Whitt, included as an
attachment to this report, that presents the methods of calculation for total
withdrawals.
6. Problems Encountered and Solutions Implemented
The following problems have been encountered during the monitoring period and
solutions implemented:
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? Vandalism to rainfall collection data. In November, 2002, the rainfall gauge
located near the mined pit was vandalized and local records were lost. As a
back-up, there is a manually recorded rain gauge located at the scale house
near the mined entrance. In addition, the NC State Climate Office maintains
a climatological station approximately 5 miles from the mine site where
temperature and rainfall data are collected. This national weather service
data is included as an attachment and is considered a useable supplement to
on-site data.
? Silt clogging of monitoring wells. Following installation of the monitoring
points in both shallow and deep systems in September 2002, it was
discovered that not all wells were responding appropriately to changes in
water levels. Investigation of this problem revealed that silt had clogged a
number of wells and that removal and redevelopment of the wells was
required. This was accomplished in mid to late November 2002 and it is
believed that the wells are responding appropriately now.
? Spurious data and erroneous readings were found in some of the deeper
gauges. These deep groundwatering monitoring wells were investigated for
the source of the problems and it appeared that they originated from the
excess pressure transducer cable length being coiled in the well and crimping
the cables such that an incomplete connection occurred between the pressure
transducer and the data recorder. This excess cable was removed from the
wells and later monitoring indicated that this solved the problem.
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Attachments
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'Ift
Attachment - Email from David Couvillon, Infinities, Inc.
From: Couvillon David [[e-mail]]
Sent: Tuesday, February 04, 2003 11:45 PM
To: Evenhouse, Chad
Subject: Martin Marietta Water Level Data Loggers
Chad,
I visited the Martin Marietta rock quarry near Rocky Point, NC on Friday, January 28th to inspect
the installation of the Infinities USA, Inc.Water Level Data Loggers on twenty-six wells on the
site.
All Water Level Data Loggers were properly installed and operating correctly.
If you have any questions or need more information, please call me at [phone].
Sincerely,
David Couvillon
Infinities USA, Inc. Data Loggers
[phone]
Martin Marietta Aggregates: Rocky Point Quarry Expansion
Mine Dewaterirg, Shallow Water Table and Deeper Ground Water Monitoring Plan
Quarterly Report March 2003
MW
03/17/03 0`_5:26
MARTIN MARIETTA 4 96784176
Martin Marietta Materials
P.O. Hox 30013
Raleigh, NC 27522-0013
Telephone: [phone]
Mr. Chad Evenhouse
Kir&cy-Hom and Associates
P.O. Box 33068
Raleigh, NC 27636-3068
Subject: Pumping Calculations
Martin Marietta Materials, Inc. - Rocky Point Quarry
N0.790
Dear Mr. Evenhouse:
You have requested some background information on the pumping rates and volumes at
Rocky Point Quarry. There is a history to these measurements and some changes have
occurred in the last year related to the figures used in these calculations.
At the present time we have 2 pit sump locations and 4 pumps. Pumps 43 and #6 pump
water to Outfall 001. Pumps #4 and #5 pump to Outfall 002, Outfa3l 002 is directly to
Strawberry Branch with. 100% of the water discharged off the property. Outfall 001 is to
a discharge ditch but some of this water is diverted to the plant as a source of process
water. We now track the volume discharged off the property at 001 by logging the hour
meter and corresponding valve direction (to the plant or discharge off the property).
Initially, the pump rates were determined by using the pump curves supplied by the
manufacturer. These rates were multiplied by the hours of operation to yield a daily or
monthly total. The rates we used were the following:
Pumn Curve Rate
Pump #3 3,750 gpm
Pump #4 3,750 gpm
Pump #5 5,700 gpm
Pump #6 3,750 gpm
In early 2002 we were working with Groundwater Management Associates on a project
at another facility. During the project they educated us about a method to determine the
accurate flow from pumps using a device know as an orifice weir. An orifice weir yields
ail accurate pipe flow through measurements and charts. We made the proper
measurements at the Rocky Point pipes and the following rates were determined:
Orifice Weir Rate
Purnp #3 1,500 gpm
Pt=p #4 1,300 gpm
Pump #5 2,950 gpm
Pump #6 1,500 gpm

03/17/03 05:2G MARTIN MARIETTA -> 96784176
March 17, 2003
Mr. Chad Evenhouse
Page 2
N0.780 902
As you can see these rates are much lower than the rates used from the pump curves. It is
clear that pump age, pipe resistance, pipe length and motor characteristics all work to
reduce the efficiency of pumps over time. The orifice weir data has been field verified a
few times and is consistent,
This change in rates accounts for the drop in reported discharge volume over the last
year. It also needs to be noted that for the last year or so the area has been in a period of
decreased rainfall. Here in the last few months the rainfall has been greater than normal
and we have noticed a slight increase in the pumping rate. The site continues to read
hour meters on each pump weekly and record the hour teeters when they switch the valve
at the discharge of Outfa l 001. All of this information goes into calculating the
withdrawal rates and the discharge volumes.
Please get in touch with this office if any additional information is needed on this matter.
Sincerely,
9L
Steve Whitt, P.E.
Manager, Environmental Services
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