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Ilud2.4 Investigation-Derived Waste Management <br /> All wastewater generated while decontaminating field-sampling equipment and the well purge <br /> water was temporarily stored on site in 5-gallon buckets. Approximately 25 gallons of <br /> decontamination and purge water from the January 19,2010,sampling event was transported to <br /> SRN's 550-gallon purge water storage tank located in Willits,California,for temporary storage. <br /> The water will be characterized and properly disposed of at an approved disposal facility. <br /> 3.0 Groundwater Monitoring Results <br /> 3.1 Hydrology <br /> LSHN measured depth-to-groundwater in the existing monitoring wells during the January 19 2010 <br /> monitoring event(Table 1). Appendix B,Table B-1 summarizes well construction details. <br /> Table 1 <br /> L Water Level Data,January 19,2010 <br /> Western Oil and Spreading Inc.,Acam o Plant Site, Acam o,California <br /> Sample Top of Casing Elevation' Depth-to-Water2 Groundwater Elevation' <br /> L Location (feet) (feet) (feet) <br /> MW-1 57.54 55.80 1.74 <br /> MW-2 57.28 55.60 1.68 <br /> LMW-3 57.26 55.69 1.57 <br /> MW-4 57.64 55.85 1.79 <br /> MW-5 58.61 56.94 1.67 <br /> MW-6 59.36 58.01 1.35 <br /> MW-7 58.53 58.76 -0.23 <br /> 1. Referenced to Mean Sea Level(MSL) <br /> 2. Below top of casin <br /> On January 19,2010,the groundwater flow beneath the site was generally to the north,with an <br /> approximate gradient of 0.004 feet per foot(ft/ft). Historic water level data is included in <br /> Appendix B,Table B-2. A groundwater contour map for the January 19,2010 monitoring event is <br /> presented as Figure 3. <br /> 3.2 Groundwater Analytical Results <br /> LTable 2 summarizes the laboratory analytical results for the groundwater samples collected during <br /> the January 19,2010 monitoring event. <br /> 4 <br /> \\Eureka\projects\2007\007152-WOS\PUBS\rpt\20100324-1stHalf2010GWMR&RFC.doc <br /> L 2 <br />