2012â Groundwater - Port of Seattle

EFMP 2011-2012 Annual Groundwater Monitoring Report iii AUGUST 2012 TABLE OF CONTENTS 1.0 INTRODUCTION ........................................................................................................................... 1 1.1 MONITORING OBJECTIVES ............................................................................................................. 1 1.2 REPORT ORGANIZATION ................................................................................................................ 2 1.3 NOMENCLATURE............................................................................................................................ 2 2.0 MONITORING WELL NETWORK ............................................................................................ 3 2.1 SITE CONDITIONS .......................................................................................................................... 3 2.2 EFMP MONITORING WELLS .......................................................................................................... 4 3.0 GROUNDWATER MONITORING PROCEDURES ................................................................. 5 3.1 WATER LEVEL MEASURMENT ....................................................................................................... 5 3.2 SAMPLING METHODS ..................................................................................................................... 5 3.3 EFMP GROUNDWATER MONITORING WELLS SAMPLED ................................................................ 6 3.4 VERIFICATION RESAMPLING .......................................................................................................... 6 4.0 LABORATORY ANALYSIS AND REPORTING ....................................................................... 7 4.1 ANALYTICAL METHODS ................................................................................................................ 7 4.2 DATA PACKAGES ........................................................................................................................... 8 4.3 DATA VALIDATION ........................................................................................................................ 8 4.4 WATER QUALITY ACTION LEVELS ................................................................................................ 9 5.0 RESULTS AND DATA EVALUATIONS ................................................................................... 10 5.1 GROUNDWATER LEVELS .............................................................................................................. 10 5.2 DATA SUMMARY ......................................................................................................................... 11 5.2.1 Trace Metals ........................................................................................................................... 11 5.2.2 Petroleum Hydrocarbons........................................................................................................ 11 5.2.3 Conventional Analytes ............................................................................................................ 12 5.2.4 Field Parameters .................................................................................................................... 12 5.3 PY4/PY5 DESCRIPTIVE STATISTICS FOR CONSTITUENTS OF INTEREST ........................................ 12 5.3.1 Trace Metals ........................................................................................................................... 12 5.4 TIME SERIES AND TREND ANALYSIS ............................................................................................ 13 5.5 SPECIAL CONSIDERATION FOR ARSENIC ...................................................................................... 14 5.6 UPDATED BASELINE DATA SETS ................................................................................................. 15 5.6.1 Site-Wide Baseline Data Statistical Analysis .......................................................................... 15 5.7 COMPARATIVE ANALYSIS OF TOTAL AND DISSOLVED METALS .................................................. 16 5.7.1 Paired Comparison ................................................................................................................. 16 5.7.2 Correlation Analysis ............................................................................................................... 17 5.8 MERCURY AT MW-8A ................................................................................................................. 17 6.0 CORRECTIVE ACTIONS PERFORMED DURING PY4/PY5 .............................................. 18 7.0 SUMMARY AND CONCLUSIONS ............................................................................................ 19 8.0 REFERENCES .............................................................................................................................. 21 EFMP 2011-2012 Annual Groundwater Monitoring Report iv AUGUST 2012 TABLES Table 2-1: Well Construction Summary Table 3-1: PY4/PY5 Well Quarterly…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]