HomeMy WebLinkAboutAnnual Groundwater Moinitoring 2014 - PLN General - 2/10/2015 1
2014 Annual Groundwater Monitoring
McEwan Prairie Facility ���mT
Mason County, Washington j�/�,� F
MAR � 2 2015
for
Port Orchard Sand and Gravel Company 1N' CE�14R �
February 10, 2015
•
2014 Annual Groundwater Monitoring
McEwan Prairie Facility
Mason County,Washington
for
Port Orchard Sand and Gravel Company
February 10, 2015
GEOENGINEERS
1101 South Fawcett Avenue, Suite 200
Tacoma, Washington 98402
253.383.4940
2014 Annual Groundwater Monitoring
McEwan Prairie Facility
Mason County, Washington
File No.1355-023-01
February 10,2015
Prepared for:
Port Orchard Sand and Gravel Company
400 Valley Avenue
Puyallup, Washington 98372
Attention: Mike Schuh
Prepared by:
o{ Wash.
GeoEngineers, Inc. ���e Z f
1101 South Fawcett Avenue, Suite 200 Gj 0
Tacoma, Washington 98402
253,383.4940
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J 1 W. Purdy, LG, LHG, C Sg L fdj ��
Senior Hy ogeologist JOEL W. PUR Y
n Igh , CFP
Senior Principal
Fisheries and Wetland Scientist
1WP:WSW:cam
Disclaimer:Any electronic form,facsimile or hard copy of the original document(email,text,table,and/orfigure),if provided,and any attachments are only a copy
of the original document.The original document is stored by GeoEngineers,Inc.and will serve as the official document of record.
GEOENGINEERS
Table of Contents
INTRODUCTION.....................................................................................................................................................1
GROUNDWATERMONITORING............................................................................................................................1
GroundwaterLevels.........................................................................................................................................2
Groundwater Quality Monitoring.....................................................................................................................2
SurfaceWater Monitoring...............................................................................................................................2
GroundwaterUse Monitoring..........................................................................................................................2
MONITORINGRESULTS........................................................................................................................................2
GroundwaterLevels.........................................................................................................................................2
SurfaceWater Levels.......................................................................................................................................3
GroundwaterQuality........................................................................................................................................3
SUMMARY............................................................................................................................................................3
RECOMMENDATIONS..........................................................................................................................................3
LIMITATIONS.........................................................................................................................................................4
LIST OF FIGURES
Figure 1.Vicinity Map
Figure 2. Monitoring Locations
Figure 3.Groundwater Level Elevations in Piezometers P-1 through P-6
Figure 4. Groundwater Level Elevations in Monitoring Wells MW-1 through MW-4
Figure 5.Annual and Monthly Precipitation at Wauna 3 SW Weather Station
Figure 6.Surface Water Level Elevations in Wetlands A through D and Rex Lake
February10 2015 Pagei
�GWENGINEER I
File No.3355-023-03
l
INTRODUCTION
GeoEngineers, Inc. (GeoEngineers) has prepared this tenth-year monitoring report for Port Orchard Sand
and Gravel Company regardingthe McEwan Prairie Surface Mine based on information gathered from 2004
to 2014. The site, 164 acres of undeveloped land, is located approximately 2 miles northwest of Shelton
near Rex Lake in Mason County, Washington. The site vicinity is shown on Figure 1. Approximately 94 of
the 164-acre site may be used for aggregate mining. The purpose of our services is to assess the
hydrogeologic characteristics of the site and analyze the relationship between the groundwater beneath
the site and the surface bodies, specifically Rex Lake and wetlands on and adjacent to the property.
The monitoring of water use, groundwater levels and groundwater quality will be used to assess the
potential impacts of surface mining on groundwater and wetlands.
GeoEngineers developed a groundwater monitoring plan for the McEwan Prairie Surface Mine based on the
proposed monitoring plan presented in the May 2002 Supplemental Environmental Impact Statement
(SETS) and our discussions with Port Orchard Sand and Gravel Company. The purpose of this annual
groundwater monitoring report is to summarize 2014 monitoring data. Please refer to the 2012 report,
which presents the complete dataset of previous 8.5 years of monitoring of surface water wetlands,
groundwater levels and groundwater quality. Extraction of material at the McEwan Prairie Facility has been
occurring since 2006.
GROUNDWATER MONITORING
There are nine groundwater monitoring points on the McEwan Prairie site. A summary of the monitoring
points atthe McEwan Prairie facility is shown in Table 1.A monitoring location map is presented as Figure 2.
TABLE 1.SUMMARY OF MONITORING POINTS AT MCEWAN PRAIRIE FACILITY
Depth to Water on Water Level
Ground Drilled Screened 4/23/2014 Below Elevation on
Designation Elevation Depth Interval Depth Top of Casing 4/23/2014
(feet)' (feet bgs) (feet bgs)
(feet) (feet)
MW-1 294.1 40 28.5 -38.5 16.04 259.04
MW-2 295.6 41 30-40 15.65 269.88
MW-3 291.0 40 30-40 26.32 268.75
MW-4 295.1 41 30-40 11.59 284.07
P-1 294.13 30 6 - 16 13.86 282.10
P-2 295.58 64 20 - 30 -1 -1
P-3 290.96 38 16- 26 25.36 268.51
P-4 295.07 26 16 - 26 14.57 282.71
P-5 279.47 41 23 - 38 20.01 262.16
P-6 294.13 46 23 - 38 23.08 272.88
Note:
1 P-2 was decommissioned in January 2008.
bgs=below ground surface
GEoENGINEERS� February 10,2015 Pagel
File No.1355-023-01
The monitoring plan calls for water quality sampling twice a year and quarterly water level measurements.
Monitoring events for 2014 occurred on January 20,April 23,July 31 and October 24.
Groundwater Levels
GeoEngineers and Port Orchard Sand and Gravel measured groundwater levels in the monitoring wells and
accessible piezometers previously installed on the property since August 26, 2004. Since then,
groundwater levels were measured at a minimum of every quarter using calibrated water level probes.
Water levels were measured and recorded relative to the rim of the PVC casing and converted to elevations
relative to a surveyed site-specific datum.
Groundwater Quality Monitoring
GeoEngineers and Port Orchard Sand and Gravel collected quarterly samples of groundwater from the
monitoring wells for standard laboratory analyses for gasoline- and diesel-range hydrocarbons (analytical
methods NW-TPH-Gx and NW-TPH-Dx, respectively). We also collected in-field measurements of
temperature, pH, specific conductivity and turbidity. Beginning in October 2012, all wells were sampled
twice a year using low-flow techniques and dedicated sample tubing. Samples from 2014 were submitted
to Spectra Laboratories in Tacoma, Washington.
Surface Water Monitoring
Surface water monitoring within the on-site wetlands was also conducted by GeoEngineers and
Port Orchard Sand and Gravel personnel. Staff gages were installed in the four on-site wetlands and at
Rex Lake.Surface water levels are monitored on a quarterly basis.
Groundwater Use Monitoring
Groundwater use monitoring is a component of the monitoring plan.However,no water has been withdrawn
from the two existing water supply wells on site. No pumps have been installed in these wells.
MONITORING RESULTS
Groundwater Levels
Hydrographs were developed for the piezometers and monitoring wells. For display purposes, the water
level elevations for the piezometers and monitoring wells were grouped separately. The measured water
level elevations for the piezometers P-1 through P-6 are shown on Figure 3. The water level elevations for
the monitoring wells MW-1 through MW-4 are shown on Figure 4. Figures 3 and 4 illustrate the seasonal
fluctuation of the shallow groundwater. In 2014, groundwater levels fluctuated in a similar season pattern
and within typical ranges as seen in previous years,with the lowest water level elevation typically occurring
in October at the end of the dry summer and fall seasons and highest in January and April in the wetter
winter and spring seasons.
Figure 5 shows the monthly and annual precipitation from National Oceanic and Atmospheric
Administration's (NOAA) Wauna 3W Minter Creek weather station, located approximately 22 miles
northwest of the site. The official record for NOAA's Wauna site only includes up to October 2014.
Precipitation in 2014 was about normal in the Puget Sound region, based on the available data.
GEoENGINEERS� February 10,2015 Page 2
Fite No.1355-023-01
Surface Water Levels
A hydrograph was developed for the staff gages placed in Wetlands A through D and Rex Lake.The surface
water level elevations are shown on Figure 6 dating back to 2004. The hydrograph shows that surface
water occurs seasonally in the wetlands, mainly during the winter months. Water levels in Rex Lake
fluctuate with the seasons. Comparing the lowest and highest measured water levels of 2014, the total
fluctuation in Rex Lake was 1.8 feet between relative Elevation 276.65 and 278.45 feet.
Groundwater Quality
There have been 35 groundwater quality sampling events for the monitoring program. Petroleum
hydrocarbons were not detected in analyzed groundwater samples from both sampling events in 2014
conducted on April 23 and October 24, 2013.
In-field measurements in 2014 indicate that temperature,pH and specific conductivity results are generally
within expected ranges. Turbidity is below 10 nephelometric turbidity unit (NTU) when using low-flow
sampling techniques.
SUMMARY
GeoEngineers and Port Orchard Sand and Gravel performed groundwater monitoring between August 2004
and October 2014 at the McEwan Prairie Facility in general accordance with the monitoring plan submitted
in the May 2002. Petroleum hydrocarbons were not detected in analyzed groundwater samples from both
sampling events of 2014.
Groundwater and surface water levels are highest during the months of March and April and lowest in the
months of September and October based on the current and historical water monitoring. Groundwater
levels fluctuated approximately 2.3 to 5.4 feet in 2014.Rex Lake fluctuated approximately 1.8 feet in 2014,
similar in magnitude and timing with water levels in piezometer P-1, the closest groundwater monitoring
point. This water level response to rainfall trends in groundwater, Rex Lake and the wetlands indicates a
hydraulic connection between groundwater levels and on-site surface water levels.
RECOMMENDATIONS
Extraction of material at the McEwan Prairie Facility has been occurring since 2006. It is our opinion that
the mining activity has had no measurable impact on the groundwater and surface water levels or
groundwater quality based on the analysis of the monitoring data. GeoEngineers makes the following
recommendations for McEwan Prairie Facility monitoring:
■ Continue quarterly monitoring of water levels in the piezometers, monitoring wells and wetlands.
The most important months are April and October of each year, when the highest and lowest water
levels, respectively, usually occur. We recommend that groundwater and surface water levels be
measured in January,April,July and October of each year.
■ We recommend that water quality sampling interval should continue to be conducted twice a year in
April and October. If mining operations were to cease for more than six months, the sampling can be
conducted once per year in October until mining operations resume at the site.A September 11,2007
letter from Mason County Department of Community Development stated that if there were no
GEOENGINEERS� February 10,2015 Page 3
File No.1355-023-01
detections of hydrocarbons after a calendar year, twice a year sampling would be allowed.
No hydrocarbons were detected in 2008, 2009, 2011, 2012, 2013,and 2014.Twice-a-year sampling
was implemented in 2012.
■ Continue low-flow sampling techniques to reduce the turbidity of samples by purging the wells at
pumping rates as low as 0.1 L/min.
LIMITATIONS
GeoEngineers has performed this groundwater and wetland monitoring in general accordance with the
scope and limitations of our proposal. Within the limitations of scope, schedule and budget, our services
have been executed in accordance with the generally accepted practices for groundwater and wetland
monitoring in this area at the time this report was prepared. No warranty or other conditions express or
implied, should be understood.
This report has been prepared for the exclusive use of Port Orchard Sand and Gravel Company, and
authorized agents and regulatory agencies following the described methods and information available at
the time of the work. No other party may rely on the product of our services unless we agree in advance to
such reliance in writing.The information contained herein should not be applied for any purpose or project
except the one originally contemplated.
CiEOENGINEERS� February 10,2015 Page 4
File No.1355-023-01
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Notes
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McEwan Prairie Facility
assist in showing features discussed in an attached document.
a GeoEngineers,Inc.cannot guarantee the accuracy and content Mason County, Washington
= of electronic files. The master file is stored by GeoEngineers,
Inc.and will serve as the official record of this communication. G EO E N G I N E E R S 1 g
Data Sources: ESRI Data&Maps,Street Maps 2008. i'I Ure 1
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Notes:
Io 1.The locations of all features shown are approximate. MCEWan Prairie Facility
2.This drawing is for information purposes.It is intended to assist in showing features discussed in an attached Mason County,Washington
'r document.GeoEngineers,Inc.can not guarantee the accuracy and content of electronic files.The master file Is stored
by GeoEngineam,Inc.and will some as the official record of this communication.
= Reference:brewing is from Parametrix.2005 / g
EO ENGINEER
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Groundwater Level Elevations in
Plezometers P-1 through P-6
McEwan Prairie Facility
Mason County, Washington
GEoENGINEER� Figure 3
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Groundwater Level Elevations in
Monitoring Wells MWA through MW-4
McEwan Prairie Facility
Mason County, Washington
GEOENGINEER� Figure 4
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McEwan Prairie Facility
Mason County, Washington
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Surface Water Level Elevations in
Wetlands A through D and Rex Lake
McEwan Prairie Facility
Mason County, Washington
GEOENGINEER� I Figure 6