Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
MEP2003-00008 Monitoring Reports Surface Mining - MEP Reports - 1/31/2017
32133-00-00020 )RCHARD= SAND & GRAVEL COMPANY Pkase RE January 31, 2017 F1 F�B 16 �O s 2 �'vder Mason County lb: IA -00- 0op street Department of Community Development Planning Division P.O. Box 279 Shelton, WA 98584 Re: Mason County Conditional Environmental Permit— Case No.: MEP2003-00008, Issued 11/3/03, Parcel 321330000020 To Whom It May Concern: Port Orchard Sand & Gravel Company is the operator of the McEwan Prairie Surface Mine in Mason County. In accordance with Condition #3 of Mason County Conditional Environmental Permit MEP2003-00008, we submit the following: • 2015 Annual Ground Water Monitoring Report prepared by GeoEngineers dated 1/30/17. • 2016 Annual Ground Water Monitoring Report prepared by GeoEngineers dated 1/23/17. Should you have any questions or comments, please feel free to contact me at 253-833- 3705x436. Sincerely, i�/— V-- Ryan Ransavage Enclosure Cc: Dean Moergeli — Port Orchard Sand & Gravel Company P.O. Box 181, Port Orchard, WA 98366 BREMERTON (360) 479-4626 FAX (360) 479-4669 Toll Free (877) 858-7674 Gig Harbor (253) 857-3006 Sequim (360) 681-2526 Seattle (206) 682-6349 2015 Annual Groundwater Monitoring McEwan Prairie Facility Mason County, Washington for Port Orchard Sand &Gravel Company January 30, 2017 2015 Annual Groundwater Monitoring McEwan Prairie Facility Mason County,Washington for Port Orchard Sand&Gravel Company January 30, 2017 GEOENGINEER� 1101 South Fawcett Avenue, Suite 200 Tacoma,Washington 98402 253.383.4940 2015 Annual Groundwater Monitoring McEwan Prairie Facility Mason County, Washington File No.1355-023-01 January 30,2017 Prepared for: Port Orchard Sand &Gravel Company 400 Valley Avenue NE Puyallup, Washington 98372 Attention:Mike Schuh Prepared by: of GeoEngineers, Inc. ° wash.h 1101 South Fawcett Avenue,Suite 200 CID �07 Tacoma,Washington 98402 253.383.4940 y rogeologist 588 /tensed e I JOEL W. PURDY Joel W. Purdy, LG, LHG, CWRE Associate Hydrogeologist JWP:WSW:cam Disclaimer:Any electronic form,facsimile or hard copy of the original document(email,text,table,and/or figure),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. I GEOENGINEERS Table of Contents INTRODUCTION.....................................................................................................................................................1 GROUNDWATERMONITORING............................................................................................................................1 GroundwaterLevels.........................................................................................................................................2 GroundwaterQuality Monitoring.....................................................................................................................2 SurfaceWater Level Monitoring......................................................................................................................2 GroundwaterUse Monitoring..........................................................................................................................2 MONITORINGRESULTS........................................................................................................................................2 GroundwaterLevels.........................................................................................................................................2 SurfaceWater Levels.......................................................................................................................................3 GroundwaterQuality........................................................................................................................................3 SUMMARY............................................................................................................................................................3 RECOMMENDATIONS..........................................................................................................................................4 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 ATTACHMENTS Spectra Laboratories Analyses Reports for April 30 and December 22,2015 GEOENGINEERS� January30,2017I Page File No.1355-023-01 INTRODUCTION GeoEngineers, Inc.(GeoEngineers) has prepared this tenth-year monitoring report for Port Orchard Sand & Gravel Company regarding the McEwan Prairie Surface Mine based on information gathered from 2004 through 2015. 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.Current permit conditions allow approximately 94 acres of the 164-acre for use in 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 forthe McEwan Prairie Surface Mine based on the proposed monitoring plan presented in the May 2002 Supplemental Environmental Impact Statement (SEIS) and our discussions with Port Orchard Sand & Gravel Company. The purpose of this annual groundwater monitoring report is to summarize 2015 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 at the 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 12/22/2015 Below Elevation on Designation Elevation Depth Interval Depth Top of Casing 12/anon 5 (feet)' (feet bgs) (feet bgs) (feet) (feet)' MW-1 294.1 40 28.5 -38.5 13.95 261.13 MW-2 295.6 41 30 - 40 11.04 274.49 MW-3 291.0 40 30-40 21.82 273.25 MW-4 295.1 41 30- 40 8.82 286.84 P-1 294.13 30 6- 16 11.79 284.17 P-2 295.58 64 20 - 30 -2 -2 P-3 290.96 38 16 - 26 19.82 274.05 P-4 295.07 26 16 - 26 11.51 285.77 P-5 279.47 41 23 -38 16.56 265.61 P-6 294.13 46 23 - 38 17.20 278.76 Notes: 'Elevations provided herein are based on a project-specific elevation datum,which is approximately 70 feet higher than Mean Sea Level. z P-2 was decommissioned in January 2008. bgs=below ground surface GEoENGINEERs� January 30,2017 1 Page 1 Fite No.1365023-01 The monitoring plan calls for water quality sampling twice a year and quarterly water level measurements. Monitoring events for 2015 occurred on January 15,April 30,August 27 and December 22. Groundwater Levels GeoEngineers and Port Orchard Sand &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 & 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 2015 were submitted to Spectra Laboratories in Tacoma,Washington.Standard procedures were followed in collecting, labeling and transporting samples.Chain of custody and quality control was maintained at all times. Surface Water Level Monitoring Surface water level monitoring within the on-site wetlands was also conducted by GeoEngineers and Port Orchard Sand &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 2015,groundwater levels fluctuated in a similarseasonal 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 December/January and April in the wetter winter and spring seasons. Water levels measured on December 22, 2015 were the highest recorded at six of the nine groundwater monitoring points. This is likely in response to high December precipitation. 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 GEOENGINEERS� January30,2017 l Page 2 File No.1355-023-01 northwest of the site.The official record for NOAA's Wauna site only includes up to August 2015.Annual precipitation in 2015 was about normal in the Puget Sound region,with record December rainfall recorded at the SeaTac rain gage. 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 is expressed seasonally in the wetlands, mainly during the winter months. Water levels in Rex Lake also fluctuate seasonally. Comparing the lowest and highest measured water levels of 2015, the total fluctuation in Rex Lake was 4.9 feet between relative Elevation 276.45 and 281.35 feet. Groundwater Quality There have been 37 groundwater quality sampling events for the monitoring program. Petroleum hydrocarbons were not detected in analyzed groundwater samples from the two petroleum hydrocarbon sampling events in 2015 conducted on April 30 and December 22,2015.The analysis results are provided in the attached laboratory reports. In-field measurements of groundwater quality during the sampling events are presented below in Table 2. TABLE 2.SUMMARY OF FIELD PARAMETER TESTING RESULTS AT MCEWAN PRAIRIE FACILITY _. SW Field Parameter mpn MW MW-1: MW MW Date - -- -,, F Vm Turbidity 4/30/2015 1.48 <1 <1 1.48 (NTU) 12/22/2015 1.36 2.3 2.1 3.58 Temperature 4/30/2015 10.8 12.5 13.5 10.7 (degrees Celsius) 12/22/2015 10.6 10.5 10.3 10.8 Conductivity 4/30/2015 110 80 60 70 (microSiemens) 12/22/2015 100 70 30 60 pH 4/30/2015 7.3 7.0 7.1 6.8 (pH units) 12/22/2015 6.8 6.6 6.3 6.5 Note: NTU=nephelometric turbidity unit SUMMARY GeoEngineers and Port Orchard Sand &Gravel performed groundwater monitoring between August 2004 and October 2015 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 2015. In-field measurements in 2015 indicate that temperature, pH and specific conductivity results are generally within observed historical ranges for the site.Turbidity is below 10 NTU when using low-flow sampling techniques. Groundwater and surface water levels are highest during the winter and spring months of December through April and lowest in the late summer and fall months of July through October based on the current GEOENGINEER� January30,2017 I Page3 Flk No.1355-023-01 and historical water monitoring.Groundwater levels fluctuated approximately 3.1 to 11.3 feet in 2015,due to a dry summer followed by a wet winter. Rex Lake fluctuated approximately 4.9 feet in 2015.This is the largest annual fluctuation for Rex Lake and the highest lake level elevation recorded. The lake level fluctuations are 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 6 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 detections of hydrocarbons after a calendar year, twice a year sampling would be allowed. No hydrocarbons were detected in 2008, 2009, and 2011 through 2015.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&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. GEOENGINEER� January30,2017►Page4 He No.1355-023-01 t,< T C .Z1 m N =3 GWENGINEERS t ` A;. r 'i .� ,✓ j, Lake Limerlck� ' f 1 i G Cranberry Lake ,r i t { i 1 1 / 'BaLit t •l,.rwr/.RI r- --:�a•.�.!, �-' _t�a__.,..... .f -_- - f ,%r... ...._ thS... -�.n..k'a Mc Ewe j Prairls Site f/ A • �, tas, ' • Rex Lake` � ••' f � 2IN X _- 11,4( � • Island Labe s� .• 51 Y `,4 .1 �.r :aww^b:,.,. Puget'So6nd/Pacific ocean r itr t I 8 Ih I p t x NNN E IGt p LL County W E i o S Maso COun S2 3,000 0 3,000 Pie, pN 'County Feet N ,l N Vicinity Map Notes: s 1.The locations of all features shown are approximate. 3 2.This drawing is for information purposes. It is intended to 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, /�/ o0Inc.and will serve as the official record of this communication. G E�E N G I N E E R.a /// Figure 1 Data Sources:ESRI Data&Maps,Street Maps 2008. f/ 8 Projection:NAD 1983,UTM Zone 10 North. � N 3 LAKE STAFF GAUGE J 1, GRNO 27855 E 1001814.05 A. BEWCHa!-29 MARK/53-8 8.62 , -�-y. -'w-._„�_��___ `.; y�- --1 ram~ ,f Toe/'PVC 295.96 11..'/T ! 7i / I;CRND-29.9 N XIJ2.95 / •ITON SC-J f 1001329.95 / IOPT 2'PVC5.47 A TOP 2'PVC-295.07 1 f TOP 6'CASING.295.57 f N 7727J2.39 ' 7LlP 1.PVC`293.87 �, A yJ'r "`J - ( I Q/,� GRNQ�29Q.96 Pli 2 UPLANO.B F) / 270.44 � - f I •MON eEU 4 .. / , n 712J0138 270.J6 .. , N 710624.95 TOP CSGv19594,%'�J� f ) E 100083].41. �N 71141413 f 10006_22.17_ O TOP 2'PVC+.295.66 1 £'10008 68 17 , N O ',E 10007B2J8 pP-2 Ir _"•-,_.�"' i, �-� 70P I'PVC 297.58 I -_STAFF GA 'C fRNO-295.6 /"' .-. GRND-264.15 ' `j N 7139?1.30 / I f,.. N 71I647.BI - 1�7 I 1. - E 1C00611.58 1 - :E 1000023I2 ` PIT 2 NET SOIL r ' ' - A TUND A' I`t F71416.96 rr 26842 t2 V_ N ]�F t 0649. !. I }r1y A0-.GAUGE / Prop {�/,`�)' D=2BS 58 i"tJ >/ TOP-UNMARKED 7'PVC 2972H ."^ A rnAND'o t E 10 350.57 N 7137395.E „\ s AFF GAUGE J �..) ' N]1J1J9.J2 d/JJJf}"�j m E 1000295.62 t 7 , t I f�i J \`CA 4.] L.MOP Nt11/' ,.J!71084 TOP 2'PVC 27 F'f000243.15 qq '�I TOP 2'P1Mi27A0B 1 JI Q `� �'�.✓� ,,,,,�� 1 E 100064.04 TOP 279.47 rl I STAFF GAUGE \ r/ S PFL CSC-2B21�'�1� 1 1 N 710777.49 LEGEND GRND-284.68 OTOP PVC CSG-29S96 E 999940.2Z N 713 19.74 ORND-292.96 �� i. 1 MOMIORING WELL(2004) E 99996J.7B N 712100,1 rn ' E.999800 v 9 PEZOMETER(1998) 1 l -MON YELL 2 N 1 ✓i� ) TOP CSG-2B5.9B i 0 WETLAND STAFF GAGE(1998) a �+ �' TOP 2'PVC-2a5.53 U 4 ftETLAND SURVEY PANT 2004 `�. / N 711416.60 I ( ) : �� E 99942I.65 O -_-PROPERTY BOUNDARY O NOTES 400 0 400 M 1. i.Ar TOP ,P YIF1fWE16KS(J99tl)..INE DATUM. HOR/ZpY TAL DATUM IS NAO 43/91 r o Ai TOP tK 1'PVC. Feel BASIS OF VERTICAL DATUM T PER - - 0 2.GROUND SURFACE FOR AT BAS STAFF GAGES ARE MASON BM BNONN ON N PR OF CRIX/ND SIIRFA(�AT BASE OF STAFF CAGE WAY PLANS FOR LkfWAN PRAIRIE 0 ROAD DATED FEBRUARY 17,1987 Monitoring Locations N Notes: 10 1.The locations of all features shown are approximate. MCEWan Prairie Facility n 2.This drawing is for information purposes.It is intended to assist In showing features discussed in an attached Mason County,Washington document.GeoEnglneers,Inc.can not guarantee the accuracy and content of electronic files.The master file is stored by GeoEnglneers,Inc.and will serve as the official record of this communication. = Reference:Drawing i from Parametrix.2005 Figure Z U GEOENGINEER� 0 SP https//projects.geoengineers.com/135502301/Finals/Forms/Allitems.aspx Figures 3 through 6.potxJWP:jwp:cam 03/07/16 290 285 f ............. ........ ... ..... .. ...... 1 \ 280 J - - rn 275 ....................... ..................... ......................................... ...,........ ID 270 ..,......... „ w 5 m 265 ...................... CU 260 .............. ... ...... ... .. . �m--. Piezometer P-1 255 ....................... — ..............., ........ ................. ,,, .— • Piezometer P-2 'i Piezometer P-3 o---e--� Piezometer P-4 I h Piezometer P-5 - _ v---v--v Piezometer PL - 250 sp to to h CO O O N CO V to (D 4 4 C 4 Q 9 C C C C C C C C C C C C C m to m m to a1 ca com to m m o3 Groundwater Level Elevations in Piezometers P-1 through P-6 McEwan Prairie Facility Mason County, Washington GEoENGINEER� Figure 3 SP hftps//projects.geoengi neers.com/13550230 1/Finals/Forms/Allitems.aspx Figures 3 through 6.potx JWP.jwp:cam 03/07/16 290 ......... ............ . ............................... .............. .. . . ..................................................................... 285 ......................................... ............................................ ............ ............... .. ............. ....................... 280 ............... ................. .......................................... ................... ... ............. ............. Monitoring Well MW-1 Monitoring Well M\N-2 Monitoring Well MW-3 275 ............................................... ............. ...................... ...................... 13---B—� Monitoring Well MW-4 . ....... .2 41 .......... ............. > 270 ............. .. ....... ...... ...... .... ............. .......... > CD ............... ........... 265 A .............. ... ............. .............\ . .........�A; 260 ........................................ ................................. ............................................ ........................................... 255 .............................. ............................................................ .............. .................................... 250 I I ITIH Ill I I I I I I Ill I Ill I TH v LO (0 r.- 00 0) o C14 rz C C a C Cn It LO CD C C 9 9 9 9 9 47 —1 —1 —1 —1 C a C C C m m m m m m m CU m CU m Date Groundwater Level Elevations in Monitoring Wells MWA through MWA McEwan Prairie Facility Mason County, Washington GEoENGINEER� Figure 4 SP https//projects.geoengineers.com/135502301/Finals/Forms/Allitems.aspx Rgures3 through 6.potxJWP:jwp:cam 03/07/16 100 90 ....... ........ ........ ........ ........ ........ ........ ............................... ......, ........ ........ ........ ........ ............................:.............. .................. 80 rr—�r+ Annual Precipitation a......:.....................b........... ........ — Monthly Preciptiation 70 ........6 7'17..:.... .............. ............................. .............. ........... ........ ......... ......: ........ ........ ........ ........ ........ 6463 62 59 € 62:75 61 76 s 60 ........58i ....,,,,,, ............................. ........ .. ........ .... ........ .... ... ... ...... ...... ....... 5584 52.07 .3 —5 4- 2 50 .,.Auerage.Annual recipita o .Qf.52.17' e 5 .......... ....... ... .. .... a 2 4 40 €...........:...........3 4....... .............. ..............`.......................................... 3 9.................................. .... ............. .................... 8 a 30 ............................................s............................. ....... ....... ........ ........ ........ ........ ........ .... 2 . 20 ........... ....... ........ ........ _ ........ ........ ..... ...... ....... ........ _ ....... ........ ........ ........ ....... 10 ........... ......... .... ................€.............. ........... .., ....... .... ........ 0 co O O N co m O t` a0 O O a— N M V, to O O O O O O O O O O O C? C C C C C C C C C C C C C C C C C C C Date Annual and Monthly Precipitation at Note: Wauna 3 SW Weather Station 1. The precipitation total for 2016 of 20.1 inches is for January through August 2015. McEwan Prairie Facility Mason County, Washington GEOENGINEER� Figure 5 SP https//projects.geoengineers.com/135502301/Finals/Forms/Allitems.aspx Figures3 through 6.potxJWP:jwp:cam 03/07/16 290 ............ m p 285 280 ... +.. ......... ,...... ... :. + + ........... ........t +..... 275 .............* ...... .................. p...................... ......................... ........: o 270 ......................... .... ....... .............. ............. ................ ............. w 265 .............. .. ........... .,,y� ,.....,. 1,,;,. 260 €..................... . . Wetland A ..,.,.................:..s..............................................:.:.................... z...................... o- —❑— f7 Wetland B +— +— + Rex Lake - - 255 ............................................tom--�—o Wetland C .,. .............................................,....................... ................. ................ ................ ................ —. Wetland D 250 1111 HIM - -w LO (0 00 O O N Cl) st'. LO CO Q 4 o Q 4 C? 7 i- P C C C C C C C C C C C C c f0 f0 l6 t0 (U f0 l9 l6 f0 f0 (0 f0 t0 Date Surface Water Level Elevations in Wetlands A through D and Rex Lake McEwan Prairie Facility Mason County, Washington GwENGINEER� Figure 6 .� \� �\ \� GEO E NG|NEERS� ATTACHMENTS Spectra Laboratories Analyses Reports for April 30 and December 22, 2015 -J--SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 06/02/2015 Project: April2015 Client ID: MW-1 McEwan Port Orchard Sand& Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/30/2015 Port Orchard, WA 98366 Date Received: 05/01/2015 Spectra Project: 2015050034 Spectra Number: l Analyte Result Units Method Diesel <100 µg/L NWTPH-D oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G Surrogate Recovery Method p-Terphenyl 82 NWTPH•D Toluene-d8 99 NWTPH-G 4•Bromofluorobenzene 90 NWTPH-G SPECTRA LABORATORIES Steve Hibbs, Laboratory Manager Page 1 of 4 a6.`sgh SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 06/02/2015 Project: April2015 Client ID: McEwan MW-2 Port Orchard Sand &Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/30/2015 Port Orchard, WA 98366 Date Received: 05/01/2015 Spectra Project: 2015050034 Spectra Number: 2 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G Surrogate Recovery Method p-Terpbenyl 82 NWTPH•D 4-Bromo0uorobenzene 89 NWTPH-G Toluene-d8 100 NWTPH•G SPECTRA LABORATORIES Steve Hibbs, Laboratory Manager Page 2 of 4 aWsgh SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 06/02/2015 Project: April 2015 Client ID: McEwan MW-3 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/30/2015 Port Orchard, WA 98366 Date Received: 05/01/2015 Spectra Project: 2015050034 Spectra Number: 3 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G surrople Recovery Method p•Terpheyl 77 NWTPH-D 4-Bmtoftuorobenzene 90 NWTPH-G Toluene-d8 100 NWTPH-G SPECTRA LABORATORIES Steve Hibbs, Laboratory Manager Page 3 of 4 a6!'sgh SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 (253)272 4850 • Fax(253)572-9838 • www.speeLralab.com 06/02/2015 Project: April2015 Client ID: McEwan MW-4 Port Orchard Sand &Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/30/2015 Port Orchard, WA 98366 Date Received: 05/01/2015 Spectra Project: 2015050034 Spectra Number: 4 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G Surrogate Recovery Me0md p-Terphenyl so NWTPH-D 4-Bromofluorobeazene 90 NWTPH-G Toluene-d8 100 NWTPH-G SPECTRA LABORATORIES Steve Hibbs, Laborat ryo Manager Page 4 of 4 a6fsgh LIPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com June 3,2015 Port Orchard Sand &Gravel Method: NWTPH-Dx PO Box 181 Sample Matrix: Water Port Orchard, WA 98366 Spectra Project: 2015050034 Applies to Spectra#: 1-4 HYDROCARBON ANALYSIS QUALITY CONTROL RESULTS MS/MSD Spiked Sample: Method Blank Date Extracted: 4/29/2015 Units: ug/L Date Analyzed: 5/13/2015 Dup. Spike Spike Spike Sample Amount Amount Percent Amount Percent % Compound Result Added Found Recovery Found Recovery RPD Diesel 0 2500 2287 91 2593 104 13 METHOD BLANK Date Extracted: 5/14/2015 Date Analyzed: 5/14/2015 Units: ug/L WTPH-D <100 Heavy Oils <500 Surrogate Recoveries: p-terphenyl 106% SPECTRA LABORATORIES Steven G. Hibbs,Laboratory Manager SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com June 3,2015 Method: NWTPH-G Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Units: ug/L Port Orchard, WA 98366 Spectra Project: 2015050034 Applies to Spectra# 1-4 HYDROCARBON ANALYSIS QUALITY CONTROL RESULTS DUPLICATE Duplicate Sample# 2015050034-4 Date Analyzed: Sample Duplicate Compound Result Result RPD Gasoline <50 <50 0 METHOD BLANK Date Analyzed: 5/12/2015 WTPH-G <50 Surrogate Recoveries: Toluene-d8 98% BFB 91% SPECTRA LABORATORIES Steven G. Hibbs,Laboratory Manager SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 12/31/2015 Project: Dec 2015 Client ID: McEwan MW-1 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 12/22/2015 Port Orchard, WA 98366 Date Received: 12/22/2015 Spectra Project: 2015120622 Spectra Number: 1 And Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G sunopte Reeo—y Method p-Terphenyl 8o NWCPH-D Toluene-d8 84 NWIPH-G 4-Bromofluorobemene 119 Nw1PH-G SPECTRA LABORATORIES Steve Hibbs,Laboratory Manager Page 1 of 4 a6/bw SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272A850 Fax(253)572-9838 www.spectra-lab.com 12/31/2015 Project: Dec 2015 Client ID: McEwan MW-2 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 12/22/2015 Port Orchard,WA 98366 Date Received: 12/22/2015 Spectra Project: 2015120622 Spectra Number: 2 AnalYte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G surrogate Recovery Method P-Tcq)hewl 84 NWTPH-D 4-Hromo$uoroberaem 130 NWTPH-G Toluene-d8 101 NWTF&G SPECTRA LABORATORIES i c. Steve Hibbs,Laboratory Manager Page 2 of 4 a6/bw SPECTRA Laboratories 2221 Ross way • Tacoma,WA 99421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 12/31/2015 Project: Dec 2015 Client ID: McEwan MW-3 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 12/22/2015 Port Orchard, WA 98366 Date Received: 12/22/2015 Spectra Project: 2015120622 Spectra Number: 3 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G soaopte Rawvery Method p-Tophenyl 88 NWTPH-D 4-Bromofluorcbe=ne 95 NWTPH-G Tohmc-dB 94 NWTPH-G SPECTRA LABORATORIES Steve Hibbs, Laboratory Manager Page 3 of 4 a6/bw SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 12/31/2015 Project: Dec 2015 Client ID: McEwan MW-4 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 12/22/2015 Port Orchard,WA 98366 Date Received: 12/22/2015 Spectra Project: 2015120622 Spectra Number: 4 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G surrogate Recovery Mediad p-TeipbeWl 89 NWTPH-D 4-gromofluo1Dbenzcae 97 NWTPH-G Tolnene-d8 78 NWTPH-G SPECTRA LABORATORIES Steve Hibbs,Laboratory Manager Page 4 of 4 aftw 1 ,r ti SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 (253)272-4850 • Fax(253)572-9838 * www.spectra-lab.com December 31, 2015 Method: NWTPH-G Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Units: ug/L Port Orchard,WA 98366 Spectra Project: 2015120622 Applies to Spectra# 1-4 HYDROCARBON ANALYSIS QUALITY CONTROL RESULTS DUPLICATE Duplicate Sample# 120662-4 Date Analyzed: 12/26/2015 Sample Duplicate Compound Result Result RPD Gasoline <50 <50 0 METHOD BLANK Date Analyzed: 12/26/2015 WTPH-G <50 Surrogate Recoveries: Toluene-d8 86% BFB 110% SPECTRA LABORATORIES Steven G.Hibbs,Laboratory Manager �l SPECTRA Laboratories 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 0 Fax(253)572-9838 • www.spectra-lab.com December 31,2015 Port Orchard Sand&Gravel Method: NWTPH-Dx PO Box 181 Sample Matrix: Water Port Orchard,WA 98366 Spectra Project: 2015120622 Applies to Spectra#: 1-4 HYDROCARBON ANALYSIS QUALITY CONTROL RESULTS MS/MSD Spiked Sample: 120354-1 Date Extracted: 12/18/2015 Units: ug/L Date Analyzed: 12/21/2015 Dup. Spike Spike Spike Sample Amount Amount Percent Amount Percent % Compound Result Added Found Recovery Found Recovery RPD Diesel <100 2500 2161 86 2001 80 8 METHOD BLANK Date Extracted: 12/29/2015 Date Analyzed: 12/30/2015 Units: ug/L Diesel <100 Heavy Oil <500 surrogate Recoveries: p-terphenyl 97% SPECTRA LABORATORIES Steven G. Hibbs,Laboratory Manager SPECIAL INSTRUCTIONS/COMMENTS: LPECTRA Laboratories CHAIN OF CUSTODY 2221 Ross Way, Tacoma,WA 98421 SPECTRA PROJECT# (253)272-4850 Fax (253) 572-9838 www.spectra-lab.com info@spectra-lab.com Return Samples: Y N Page of STANDARD RUSH ll ADDRESS CLIENT: DDRESS. CHANGE PROJECT: e-L CV HYDROCARBONS ORGANICS METALS OTHER CONTACT. Cn^ rA SAMPLED BY: w PHONE: 3 17(FAX: > a of n. Preter X O O t JO O> y d ae-MAIL: = p ¢ w zpU x _ w v N �PURCHASE RDER# w z _ = N o o °p ab a. n. a cn S cp U co a � � o O m = g X v v o 0 6 o ii Q CL Q. w rn p DATE TIME N N N N O O O D U 2 g 0 0 SAMPLE ID SAMPLED SAMPLED MATRIX z z m m z z co 0o w ao ao E— i— F a t— LL m rn 1AA W 2 hn vJ� AAVV'Z 3 t\/\ M 3 4 hAV 5 6 7 8 9 10 LAB USE ONLY I TURE PRINTED NAME COMPANY DATE TIME Shipped Via: RELINQUISHED BY 2- US Mail PS Fed Ex Couner Client hipping Container: RECEIVED BY `. Cooler ox Envelope None RELINQUISHED BY Tracking# Custody Seals: RECEIVED BY Payment Terms:Net 30 days.Past due accounts subject to 1 1/2%per month interest. Customer agrees to pay all costs of collection including reasonable Cooler Temp.agSample Temp. attorney's tees and all other costs of collection regardless of whether suit Is filed in Pierce Co.,WA venue. Spectra Laboratories,LLC Have we delivered World Class Client Service? Please let us know by visiting www.geoengineers.com/feedback. GMENGINEER� y :1 7 1 :j 1 a� 9�9 '.l 2016 Annual Groundwater Monitoring McEwan Prairie Facility Mason County,Washington for Port Orchard Sand&Gravei Company January 23, 2017 • 2016 Annual Groundwater Monitoring McEwan Prairie Facility Mason County,Washington for Port Orchard Sand &Gravel Company January 23, 2017 GEOENGINEERS� 1101 South Fawcett Avenue, Suite 200 Tacoma, Washington 98402 253.383.4940 i 2016 Annual Groundwater Monitoring McEwan Prairie Facility Mason County, Washington File No.1355-023-01 !i January 23,2017 I I Prepared for: Port Orchard Sand &Gravel Company 400 Valley Avenue NE Puyallup, Washington 98372 of Was Attention:Mike Schuh f0 Prepared by: GeoEngineers, Inc. 1101 South Fawcett Avenue,Suite 200 Hydrogeologist Tacoma,Washington 98402 253.383.4940 Sed JOEL W. PURDV j tw � . oel W. Purdy, LG, LHG,CWRE Associate Hydrogeologist JWP:JWP:cam Disclaimer.Any electronic form,facsimile or hard copy of the original document(email,text,table,and/or figure),If provided,and any attachments are only copy of the original document.Theo rigin a I document is stored by GeoEn gin eers,Inc.and will serve as the official document of record. GEOENGINEER� Table of Contents INTRODUCTION.........................................................................................................................................................1 GROUNDWATERMONITORING................................................................................................................................IL GroundwaterLevels.............................................................................................................................................2 GroundwaterQuality Monitoring.........................................................................................................................2 SurfaceWater Level Monitoring..........................................................................................................................2 GroundwaterUse Monitoring..............................................................................................................................2 MONITORINGRESULTS............................................................................................................................................2 GroundwaterLevels.............................................................................................................................................2 SurfaceWater Levels...........................................................................................................................................3 GroundwaterQuality............................................................................................................................................3 SUMMARY................................................................................................................................................................3 RECOMMENDATIONS..............................................................................................................................................4 LIMITATIONS.............................................................................................................................................................4 LIST OF FIGURES Figure 1.Vicinity Map Figure 2. Monitoring Locations Figure 3.Groundwater Level Elevations in Piezometers P-1through P-6 Figure 4. Groundwater Level Elevations in Monitoring Wells MW-1 through MW-4 Figure 5.Annual and Monthly Precipitation at Olympia Airport Weather Station Figure 6.Surface Water Level Elevations in Wetlands A through D and Rex Lake ATTACHMENTS Spectra Laboratories Analyses Reports for April 29 and October 31,2016 GEOENGINEERS January 23,2017 1 Page File No.1355-023-01 INTRODUCTION GeoEngineers, Inc. (GeoEngineers) has prepared this 111h-year monitoring report for Port Orchard Sand & Gravel Company regarding the McEwan Prairie Surface Mine based on information gathered from 2004 through 2016. 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.Current permit conditions allow approximately 94 acres of the 164-acre for use in 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 (SEIS) and our discussions with Port Orchard Sand & Gravel Company. The purpose of this annual groundwater monitoring report is to summarize 2016 monitoring data. Please refer to the 2012 report, which presents the complete dataset of previous 9 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 at the 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 10/30/2016 Below Elevation on Designation Elevation Depth Interval Depth Top of Casing 10/30/2016 (feet)'. (feet bgs) (feet bgs) (feet) (feet)'. MW-1 294.1 40 28.5 -38.5 15.99 259.09 MW-2 295.6 41 30-40 15.50 270.03 MW-3 291.0 40 30 - 40 26.42 268.65 MW-4 295.1 41 30 - 40 10.55 285.11 P-1 294.13 30 6- 16 13.58 282.38 P-2 295.58 64 20- 30 -2 -2 P-3 290.96 38 16 - 26 25.84 268.03 P-4 295.07 26 16 - 26 13.96 283.32 P-5 279.47 41 23 - 38 21.31 260.86 P-6 294.13 46 23 - 38 23.35 272.61 Notes: 1 Elevations provided herein are based on a project-specific elevation datum,which is approximately 70 feet higher than Mean Sea Level. 2 P-2 was decommissioned in January 2008. bgs=below ground surface GEOENGINEERS� January 23,2017 1 Pagel Flle No.1355-023.01 The monitoring plan calls for water quality sampling twice a year and quarterly water level measurements. Monitoring events for 2016 occurred on March 23,April 29,September 28 and October 30. Groundwater Levels GeoEngineers and Port Orchard Sand &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 & 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 2016 were submitted to Spectra Laboratories in Tacoma,Washington.Standard procedures were followed in collecting, labeling and transporting samples.Chain of custody and quality control was maintained at all times. Surface Water Level Monitoring Surface water level monitoring within the on-site wetlands was also conducted by GeoEngineers and Port Orchard Sand &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 2016,groundwater levels fluctuated in a similar seasonal pattern and within typical ranges as seen in previous years,with the lowest water level elevation typically occurring in September/October at the end of the dry summer and fall seasons and highest in December/January and April in the wetter winter and spring seasons.Water levels measured on October 30,2016 were higher than normal for the typical October due to record-breaking rainfall in October. Figure 5 shows the monthly and annual precipitation from National Oceanic and Atmospheric Administration's (NOAA) Olympia Airport weather station (Station # 456114), located approximately 20 miles southwest of the site. Previous reports included the record for NOAA's Wauna site. However,the site GEOENGINEERS January23,2017 1 Page File No.1355-023-01 is no longer active as of August 2015.Annual precipitation in 2016 was above normal in the Puget Sound region,with record October rainfall recorded at the Olympia Airport rain gage as previously noted. 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 is expressed seasonally in the wetlands, mainly during the winter months.Water levels in Rex Lake also fluctuate seasonally. Comparing the lowest and highest measured water levels of 2016, the total fluctuation in Rex Lake was 2.2 feet between relative Elevation 278.05 and 280.25 feet. Groundwater Quality There have been 39 groundwater quality sampling events for the monitoring program. Petroleum hydrocarbons were not detected in analyzed groundwater samples from the two petroleum hydrocarbon sampling events in 2016 conducted on April 29 and October 31, 2016.The analysis results are provided in the attached laboratory reports. In-field measurements of groundwater quality during the sampling events are presented below in Table 2. TABLE 2.SUMMARY OF FIELD PARAMETER TESTING RESULTS AT MCEWAN PRAIRIE FACILITY Sampling Field Parameter Date MW-1 MW-2 MW-3 MW-4 Turbidity 4/29/2016 2.0 2.0 3.91 0.3 (NTU) 10/31/2016 2.41 0.0 0.39 0.0 Temperature 4/29/2016 9.9 10.2 9.2 10.0 (degrees Celsius) 10/31/2016 9.9 10.1 10.3 9.9 Conductivity 4/29/2016 100 70 40 70 (microSiemens) 10/31/2016 100 40 50 70 pH 4/29/2016 6.8 6.52 6.26 6.14 (pH units) 10/31/2016 6.54 5.94 5.8 5.9 Note: NTU=nephelometric turbidity unit SUMMARY GeoEngineers and Port Orchard Sand &Gravel performed groundwater monitoring between August 2004 and October 2016 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 2016. In-field measurements in 2016 indicate that temperature, pH and specific conductivity results are generally within observed historical ranges for the site.Turbidity is below 10 NTU when using low-flow sampling techniques. Groundwater and surface water levels are highest during the winter and spring months of December through April and lowest in the late summer and fall months of July through October based on the current and historical water monitoring.Groundwater levels fluctuated approximately 4.5 to 9.6 feet in 2016,due GEoENGINEERS January23,2017 I Page3 Ale No.1355-023-01 to a wet winter followed by a dry summer. Rex Lake fluctuated approximately 2.2 feet in 2016. The lake level fluctuations are similar in 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 detections of hydrocarbons after a calendar year, twice a year sampling would be allowed. No hydrocarbons were detected in 2008, 2009, and 2011 through 2016.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&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. GEOENGINEERS� January 23,2017 1 Page File No.1355-023-01 N W W Z 0 Z LU O ,Wn V a, 1�•9Ma ^ /, R ► I•�\r`; f i s Lake Limerick%X .� M ` Cranberry Lake f 3Q ` IT POO t _ l JOt1 Y i t ;l t % yet C Mc Ewe Prsirfe f� �. V t Site i 1 ' Uff s I/ I/ 'Rex Lake'- .• f CUM Ink 4's-lime Island Lake 9 Puget,Soun d/Pacifi c Ocean AllJ 4a Shelton M a £ — V IUts�p / . LLi County wE r �l� M S 0 Maso M Courikij St •d,/ 3,000 0 3,000 � Pter�ce 'County Feet M © _ Vicinity Map Notes: s 1.The locations of all features shown are approximate. 5 2.This drawing is for information purposes. It is intended to McEwan Prairie Facility w 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, R� A� oInc.and will serve as the official record et this communication. G Eo E N G I 1 r E E R S� g Data Sources:ESRI Data&Maps,Street Maps 2008. �/ Figure 1 Projection: NAD 1983,UTM Zone 10 North. 3 STAFF CADGE 1 � N 12711.5a J,\• �\ BI71G1 wwr. // \ ����'�- ����jj" �._7 a /� '` I r Top 1,zed,! 295.96 �' ^'• / N 1369395 �J 411 HELL 3 1 100132A95 1 TOPTOP 2 CST'rPMC295.43 1 1'i"� / �`• 1�.. -295.07 f N 712232.39 * JJyyy /�•�/ '\� 1 I 70P b'CAS NG 295.53 I E IDDImS.n ,� �, v � _ - I It ,�- n 1 TOP 1 PVC Y9187 (j�1� `�•✓ W 4 1 GTNO-2DQ.% !,, -PIT 2 UPL,1N0 a n 2]0PVT I pANO ` 1Z 1} 270J6 1� E •utaN 11E11 4 ^, ! E Ot70EJJ.41- 71 13 N 7I06M.9b \ I Q TOP CSG=29S94 - `._ ! 7 E�000622.17_ N 1415 70P 2-, -29566 - t Y� ..E._1000e166.i7�� \ f N10337� / ` r�_`-�--77-7 ! _ r p P-2 % �11A11 A L'0 `� 4FOP I'P4C 297.56 O NR 1307130 _ I I ��. N 77GffN01547.94 \t r pp NEf SdL •E I00062112 ` E 10006/1.58 I2S&4211Ei SM %610843.42 N 7If416.98 E 70005BA7@ G'A'GAUGEO P 4 ztB7scei0P'UITMARKFD 7'PYD 297.2E ` A'WI-NDb' I GRNO-295.1 1 �.� AI GAUGE IJ>_ , J50.57 N 13139.32 , I MOM%ELL 1 -- E1000295.62 t 1` / N 71094ti - .� •• ,� _ I '. , 100D2,S76 / • 70P T'PVC-275.09 � N 710f26.04 E 700064.04 'i \✓'Ott SP�t CSG-2azir, ! ��[C71�t�RNp0 ('� MNO-279.47 J STAFF GAUGE t / l \.O P-8 1, / N V9940,8 LEGEND ORND=284.68 7 TOP PVC CSG-29S 96 E 999407T N 71J419.]4 GRHO-292.96 I'�....\ I • MONITORING WELL(2004) E 999963.78 ' `�, E-999800J �.-,..a O PIFZDUE7FR(1998) % %rTOP CSG-2a5.98 1 A mcrLANO STAFF CAGE(199a) �' TOP 2'PVC-2B5.53 ( ! aA VETLANO SURVEY POINT(2004) I -•_-..0$09421.0500 -PROPERTY BOUNDARY U7 \ 400 0 400 M NOTES 7. t VANG'IS IW P/tLLYrtlt"(199d)Mt DATUM:HORIZONTAL DATUM IS MAC)e3/9I I Feel QOQ AT TOP OF I"PVC BASIS VERTICAL DATUM IS PER U 2.ELEVATIONS FOR aETLANO STAFF GAGES ARE MASON SM SHOWN ON RIGHT OF GROUND SURFACE AT BASE OF STAFF GAGE WAY PUNS FOR 7AFWAN PRAIRIE p ROAD DATED FEBRUARY 17,1987 Monitoring Locations M N Notes: McEwan Prairie Facility 0 1.The locations of all features shown are approximate. u1 2.This drawing Is for Information purposes.It is intended to assist In showing features discussed to an attached n document.GeoEnglneers,Inc.can not guarantee the accuracy and content of electronic riles.The master file is stored Mason County,Washington f by GeoEnglneers,Inc.and will serve as the official record of this communication. i Reference:Drawing Is from Parametdx.2005 G ME N G I N E E R Figure 2 U lY 0 SP https//projects.geoengineers.com/135502301/Finals/Foans/Allitems.aspx F1gures3 through 62016 GW Levels-Predp-Surf WtrLevels.potx JWP:jwp:cam 01/10/17 290 ................................................................ ....................... ................... ............... ... ...................... ................... Piezometer P-2 Decommission 285 ..................... ....... ......... ............... .... ............... ...................... ............................................. . A ik 280 ............ ....... .............. .......... ............. U) .................... ................... ................ ............................................................... ...... .................. ........................................ ......................................... Cl) 275 . .................. 0 >ca 270 ................... . ........ .. ...... . ....... ..... W 76) a) 265 ..................... ..................... ..................... .................... .................. co at 26.5.97 feet MSL 260 .................... ...... .......... .................. .......... ..... ..... Piezometer P-1 255 ............... ............. ..................... a Piezometer P-2 ........... .......................................... H El Piezometer P-3 Piezometer P-4 Piezometer P-5 v Piezometer P-8 250 11111111111 1 1111111111111 IIIIIIIITHIII 111111 11111111111111111 IIIHIIIIII 11111111111111111111111111111111 111[1111111 9 It Ul 9) r- 00 0 0 04 CV) U1) CO 9 9 C C: C� r- r- Co m m m m m m Co Groundwater Level Elevations in Plezometers P-1 through P-6 McEwan Prairie Facility Mason County, Washington GEoENGINEER� Figure 3 SP https//projects.geoengineers.com/135502301/Finals/Forms/Allitems.aspx Figures 3 through 6 2016 GW Levels-Precip-Surf WV Levels.potx JWP:jwp:cam 01/10/17 290 ............... ....................... ..................... ........... ........................................................ ........... 285 ............................................. ............ ......... ................. ................. ............. ............. 280 ............. ............. ............... ... ............... ............ Monitoring Well MW-1 —A— Monitoring Well MW-2 CO Monitoring Well MW-3 275 ................ .......... ................. ..................... ................ 13 a ❑ Monitoring Well MW-4 ............................. LD A m > 270 ....................... ....... ... ............. . ......... ........... ............... ... .......... : LU ........... 265 .............. .... ........... ................... . ..... ...... ...... 260 ............................................... ................ ........... ................. ..................... .......... ................... ................. .............. 255 ........................................ ................ ........ .......... .................................................................................................... ..................... 250 I H-11 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 11111 11111111111 11111111111 11111111111 11111111111 11111111111 11111 ITITFFITFFFFFFFFTI It LO 00 00 0 LO 9 9 V �2 — 9 C? 7 7 C C: C: C: CL CL r- m m m m m CU m c6 CU Date Groundwater Level Elevations in Monitoring Wells MW-I through MW-4 McEwan Prairie Facility Mason County, Washington GEoENGINEER S�c Figure 4 SP https//projects.geoengineers.Gom/135502301/Finals/Forms/Aliltems.aspx Figures3 through 62016GW Levels-Precip-SurfWtrLevels.potxJWP:jwp:cam 01/10/17 100 — 90 .............. ......, ....... ...., ....... ...... ............................. ..... ..... - ... ....... 80 ..... ..... ...... ...... .� Annual Precipitation - Monthly Preciptiation 70 ....................................................... ............. ............. ............................- ....... ........ ...... Cn cD 60 57 ....... . .............0.......... ....... ....... ....... ...... ...... ....... - ...... ..... ....... ............. 5V52 S7 rr ... ... 5994 i 59.59 c 54:5 C —` — 5L07— ;— — — — — — — — _ 5256 € 77 g 50 — ^....4 -07 50, Average Annual recipi n ofi 0 rA es 47 8 m a 4 4 :46 41: € € € a40 .............•.......................................... ............. ............. ...........i............ ..,..,....... ..........................`.....................................................................;.......................... ............. 30 ..............i...................................................... ....... ... ....... ......: ....... ...... ...... ... ....... ....... ....... ....... 20 .............................s.............o..............1.. ....... ....... ..... ...... ....... ........................................... 10 ...... ....................•............... ......•...•s.....:... ...... ............. ........... ............................ ...........i L LA 0 00 O O .- N M d' LO CO r` CO O O N M Cn (O f` O CA O O O O O O O O O O i `- 7 7 C C C C C C C C C C C C C C C C C C C C m m m m m Co m m m m CO Co (d m m m CO m m m -� -bate Annual and Monthly Precipitation at Note: Olympia Airport Weather Station 1. The precipitation totalfor2016 of20.1 inches Is forlanuary through August 2015. McEwan Prairie Facility Mason County, Washington GEOENGINEER� Figure 5 SP https//projects.geoengineers.corn/135502301/Finals/Forms/Allltems.aspx Figures 3 through 6 2016 GW Levels-Precip-SurfWtrLevels.potxJWP:jwp:cam 01/10/17 290 .......................................................... v,,.,...,.......,,.,,. NMI p 285 ..........., 280 ....................... .+,,,,.....,,.,: ... +..�..,)F., y ... ..� + f '\ _ + + + _ + + Q) 275 .............. ...€......................,,........................................;..................... ..................... ............... ............... ....... .......... : c - 0 270 .............. .............. - ,......... ............... .............. .............. ....................................... ................... LJ _. 265 ............. ........ •... •.. ...........•.._,,/....•... .•.....•......€.,,.. m - - 260 A-- — . Wetland A .............s......,.............. ................. ............... ............... ............., ............................................ o- —❑— =I Wetland B +-- +— + Rex Lake o--�—o Wetland C 255 .............................................. ............ .................,,., i....................s............. •—• Wetland D 250 O C? C? O O O O _ N to Co C C C C C C C C C C C C C C m N (0 f0 f0 (0 f0 cc f0 N as m f0 (u Date Surface Water Level Elevations in Wetlands A through D and Rex Lake McEwan Prairie Facility Mason County, Washington GEOENGINEERS Figure 6 #/ �) �\ �} �) � �} � ©} {w \� �$ .� � �\ \\ .� � GEOENG|NEER� ATTACHMENTS Spectra Laboratories Analyses Reports for April 30 and December 22, 2015 \ SPECTRA Laboratories ...Where ;,yrrietir r matters 2221 Ross Way ' Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 05/13/2016 Project: April 2016 Client ID: McEwan MW-1 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/29/2016 Port Orchard,WA 98366 Date Received: 05/02/2016 Spectra Project: 2016050033 Spectra Number: 1 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G stmopte Recovery Mcthod Tduene-M ]1s NW11'H-0 4-Bm=f1uorobenzene 114 NWTPH-G p-Tmphw 99 NWTPH-D SPECTRA LABORATORIES Steve Hibbs,Laboratory Manager Page 1 of 4 4"W SPECTRA Laboratories Where experience matters 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectm-lab.com 05/13/2016 Project: April2016 Client ID: McEwan MW-2 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/29/2016 Port Orchard,WA 98366 Date Received: 05/02/2016 Spectra Project: 2016050033 Spectra Number: 2 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G Surrogate Recovery Method p-Terphenyl 107 NWTPH-D 4-Bromofluombemene 114 NWTPH-G Toh1ene-d8 119 NWTPH-G SPECTRA LABORATORIES Steve Hibbs,Laboratory Manager Page 2 of 4 a"w -A-- SPECTRA Laboratories ...Where txpertenct matters 2221 Ross Way Tacoma,WA 98421 • (253)2724850 • Fax(253)572-9838 • www.spectra-lab.com 05/13/2016 Project: April2016 Client ID: McEwan MW-3 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/29/2016 Port Orchard,WA 98366 Date Received: 05/02/2016 Spectra Project: 2016050033 Spectra Number: 3 Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G sum pte Recovery Method P-T-Pk-A 89 NWTPH-D 4-Bmmofluorobenua 114 NWTPH-G Toluene-d8 120 NWTPH-G SPECTRA LABORATORIES Steve Hibbs,Laboratory Manager Page 3 of 4 a6/bw SPECTRA Laboratories ...Where , %1,,1,,o, t matters 2221 Ross Way • Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com 05/13/2016 Project: April2016 Client ID: McEwan MW-4 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 04/29/2016 Port Orchard,WA 98366 Date Received: 05/02/2016 Spectra Project: 2016050033 Spectra Number: 4 alYte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <50 µg/L NWTPH-G surmsote Recova y Method P-Te*Phenyl 97 NWrPH-D 4-Bromofluombe=ne 114 NWTPH-G Toluene-a 117 NWTPH-G SPECTRA LABORATORIES Steve Hibbs,Laboratory Manager Page 4 of 4 a6/bw SPECTRALaboratories ...Where r%pt;tem( matters 2221 Ross Way + Tacoma,WA 98421 • (253)272-4850 • Fax(253)572-9838 • www.spectra-lab.com May 16,2016 Method: NWTPH-G Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Units: ug/L Port Orchard,WA 98366 Spectra Project: 2016050033 Applies to Spectra# 1-4 HYDROCARBON ANALYSIS QUALITY CONTROL RESULTS DUPLICATE Duplicate Sample# 050033-4 Date Analyzed: 5/3/2016 Sample Duplicate Compound Result Result RPD Gasoline <50 <50 0 METHOD BLANK Date Analyzed: 5/3/2016 WTPH-G <50 Surrogate Recoveries: Toluene-d8 116% BFB 98% SPECTRA LABORATORIES Steven G.Hibbs,Laboratory Manager SPECTRA Laboratories Where experience matters 2221 Ross Way • Tacoma,WA 98421 • (253)272-4M * Fax(253)572-9838 • www.sp ectra-lab.com May 16,2016 Port Orchard Sand&Gravel Method: NWTPH-Dx PO Box 181 Sample Matrix: Water Port Orchard,WA 98366 Spectra Project: 2016050033 Applies to Spectra#: 1-4 HYDROCARBON ANALYSIS QUALITY CONTROL RESULTS MS/MSD Spiked Sample: 040549-1 Date Extracted: 4/26/2016 Units: ug/L Date Analyzed: 4/28/2016 Dup. Spike Spike Spike Sample Amount Amount Percent Amount Percent % Compound Result Added Pound Recovery Found Recovery RPD Diesel <100 2500 1652 66 1488 60 10.4 METHOD BLANK Date Extracted: 5/10/2016 Date Analyzed: 5/12/2016 Units: ug/L, Diesel <100 Heavy Oil <500 Surrogate Recoveries: p-terphenyl 113% SPECTRA LABORATORIES Steven G. Hibbs,Laboratory Manager �j SPECIAL INSTRUCTIONS/COMMENTS: 1 SPECTRA Laboratories CHAIN OF CUSTODY 2221 Ross Way, Tacoma,WA 98421 SPECTRA PRQJECT# (253) 272-4850 Fax (253) 572-9838 www.spectra-lab.com ink Cis ectra-lab.com Return Samples: Y N Page of STANDARD RUSH El CLIENT ADDRESS(�I ADDRESS: CHANGE u PROJECT. b HYDROCARBONS ORGANICS METALS OTHER CONTACT- SAMPLED BY: Cr Lu z z PHONE.�rJj'� �� w _ Prefer FAX v0 c7 O Oj 2 y or rV e MAID ore-MAIL 0 w p a O q m W z m Q J a) F- w U x 2 LL O a ' U F- H a ¢ o X ul z a PURCHASE ORDER# w = �? n 'v o Lo w w w W S z 2 2 O w N = N ¢ o o a V m a a s cn = o U co a D v o = m DATE TIME x �* o o 0 o c� ¢ ¢ n n o O m o c� �D 6 to 6 n W < < J �l rL 0 J c0 (O N N N N O O CJ U U 2 O O SAMPLE ID SAMPLED SAMPLED MATRIX z z �m m z z o 0 Co co w r- i- I- a I- F w m ti 3 MW 3 y 3 .3o X X 4 �A Vi-ify 5 6 71 8 9 10 LAB USE ONLY ATURE PRINT D NAME COMPANY DATE TIME Shipped Via: RELINQUISHED BY US Mail UPS Fed Ex Courie Clien I ,� Shipping Container: RECEIVED BY rofc �� Box Envelope None RELINQUISHED BY Tracking# _ Custody Seals:1 N`�t: Y N RECEIVED BY / Payment Terms:Net 30 days.Past due accounts subject to 1 112%per month interest. Customer agrees to pay all costs of collection including reasonable Cooler Ten-IV •rO Sample Tem .5 attorney's fees and all other costs of collection regardless of whether suit is filed in Pierce Co.,WA venue. Spectra Laboratories,LLC ,h 1 SPECTRA Laboratories 1 S ...Where experience matters 2221 Ross Way • Tacoma, WA 98421 (253) 272-4850 • Fax (253) 572-9838 • www.spectra-lab.com 11/03/2016 Project: Oct 2016 Client ID: McEwan MW-1 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 10/31/2016 Port Orchard,WA 98366 Date Received: 10/31/2016 Spectra Project: 2016101020 Spectra Number: 1 Rush AnalYte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <100 µg/L NWTPH-G surropte Recovery Method Toluencd8 89 NWIPH-G 4-Bromofluorobenzew 57 NWCPH-0 p-Terphonyl 88 NWIPH-D SPECTRA LABORATORIES 0"SbK1_0JMbs,'Eaboratory Manager Page 1 of 4 ern SPECTRA Laboratories ...Where experience matters 2221 Ross Way • Tacoma,WA 98421 (253) 272-4850 • Fax (253) 572-9838 • www.spectra-lab.com 11/03/2016 Project: Oct 2016 Client ID: McEwan MW-2 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 10/31/2016 Port Orchard,WA 98366 Date Received: 10/31/2016 Spectra Project: 2016101020 Spectra Number: 2 Rush Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <100 µg/L NWTPH-G Sur-pte Recovery Method Tohiene-d8 86 NWIPH-G 4-Brumoflumben=w 56 NWTPH-G p-Terphenyl 84 NWTPH-D SPECTRA LABO S -""S s,Laboratory Manager Page 2 of 4 a6/bw SPECTRA j� T ►Jr ECTRA Laboratories ...Where experience matters 2221 Ross Way • Tacoma, WA 98421 (253) 272-4850 • Fax (253) 572-9838 • www.spectra-lab.com 11/03/2016 Project: Oct 2016 Client ID: McEwan MW-3 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 10/31/2016 Port Orchard,WA 98366 Date Received: 10/31/2016 Spectra Project: 2016101020 Spectra Number: 3 Rush byte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <100 µg/L NWTPH-G surropte Recovery Method TolueneA8 87 NW'IPH-G 4-Bromotluorobenann 56 NWTPH-G p-Tefph-yl 85 NWTPH-D SPECTRA LABORATORIES r S bs, aboratory Manager Page 3 of 4 a6/bw �y SPECTRA 1 RA Laboratories ...Where experience matters 2221 Ross Way • Tacoma,WA 98421 (253) 272-4850 • Fax (253) 572-9838 • www.spectra-lab.com 11/03/2016 Project: Oct 2016 Client ID: McEwan MW-4 Port Orchard Sand&Gravel Sample Matrix: Water PO Box 181 Date Sampled: 10/31/2016 Port Orchard,WA 98366 Date Received: 10/31/2016 Spectra Project: 2016101020 Spectra Number: 4 Rush Analyte Result Units Method Diesel <100 µg/L NWTPH-D Oil <500 µg/L NWTPH-D Gasoline <100 µg/L NWTPH-G surrogate Recovery Method Toluene-d8 87 NWrl?" 4-BromoBuorobc zenc 57 NWIYH-G p-Terphenyl 99 NWTPH-D SPECTRA LABORATORIES S e bs, ratory.Manager Page 4 of 4 a6/bw SPECIAL INSTRUCTIONS/COMMENTS: SPECTRA Laboratories CHAIN OF CUSTODY 2221 Ross Way, Tacoma,WA 98421 _ J SPECTRA PROJECT># (253)272-4850 Fax(253)572-9838 X:��H www.spectra-lab.com info@spectra-lab.com Return Samples: Y N Page of STANDARD CLIENT. �- O�C, �� n ADDRESS� ADDRESS CHANGE PROJECT. l� HYDROCARBONS ORGANICS METALS OTHER CONTACT: N SAMPLED BY: Ir w Z N W PHONE: = Pre W oC W Q U O a O y CUC d Cr` e-MAIL '� S F v O aO >_ cc LL O 0 z W CL 0 d � ¢ m J 1 0 Cl) � PURCHASE DER# _ �? ° ° `� a a W ° �_ o v w O w _ � ¢ a w w a w m a d co x U . a m v o m DATE TIME w w �* v 3 o d o A ¢ ¢ a a O m o SAMPLE ID MATRIX M - F I- W � N N N N o 0 o U U z cc O o SAMPLED SAMPLED z z m m z z oo co ao w ao F- I- I- a 1- w m m 2 N'lc w-� �o)rg) 3 7—M 3 F,)-C M �A' to y3��1 3 4W 5 s 7 8 9 10 LAB USE ONLY SIG TURE PRIN D NAME COMPANY DATE TIME RELINQUISHED BY to c�h RECEIVED BY rf RELINQUISHED BY RECEIVED BY Payment Terms:Net 30 days.Past due accounts subject to 1 1/2%per month interest. Customer agrees to pay all costs of collection including reasonable attorneys fees and all other costs of collection regardless of whether suit is filed in Pierce Co.,WA venue. Spectra Laboratories,LLC Have we delivered World Glass Client Service? Please let us know by visiting www.geoengineers.com/feedback. GMENGINEER�