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i 3.0 GROUNDWATER MONITORING PROGRAM I The groundwater monitoring program discussed below Included two separate monitoring events conducted in December 2000 and March 2001 The measurement and sampling methods employed during the two groundwater momtonng events are discussed in the following sections 3 1 DECEMBER 2000 MONITORING EVENT I3.1.1 Groundwater_Measurements—December 2000 On December 5, 6, and 7, 2000, Blaes Environmental measured the depth to groundwater in the 23 groundwater monitor well casings associated with the site Groundwater levels were measured from the top of the surveyed monitoring well casing to the groundwater surface, and were measured to the nearest 0 01-foot using a Heron TM electric water level sounder The water level depth and time of measurement were recorded on a standard held data sheet The held data sheet is included in Appendix A and summarized In Table 3 Groundwater depth measurements were performed in accordance with Blaes Environmental groundwater monitoring procedures presented in Appendix B Groundwater depths recorded In December 2000 ranged from 45 52 feet bgs at MW-7 to 48 92 feet bgs at MW-6 These measurements corresponded to groundwater elevations ranging from 27 04 to 28 24 feet below mean sea level No free-phase hydrocarbons were observed dunng collection of groundwater level measurements IThe data from the middle `B" well casings were used to create a groundwater conditions map showing the groundwater flow direction across the site Due to the drop In groundwater at the site, the upper "A" casings contained very little or no water The average groundwater flow direction as of December 7, 2000 was toward the north with an estimated hydraulic gradient of 0 0012 feet/foot(Figure 3) IOther water level data collected from the lower well casings with screened intervals below the groundwater level indicated that water levels were comparable to those in the middle well casings No distinctive trend between the water levels of the middle and lower casings was evident o7naol Blaes Protect 4002-70950-02 7 bjm C IBLAESIU-Hau1170950170950r101 doc