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Report-Groundwater Inves,.sation <br /> First Student Bus Facility(Former A.W. Hayes Facility) <br /> 2005 Navy Drive—Stockton, CA <br /> D. GROUNDWATER SAMPLE COLLECTION <br /> On November 18, 2008, groundwater samples were collected from monitoring wells <br /> MW-1, MW-3, and MW-4. Prior to beginning monitoring well sampling activities, the <br /> depth to groundwater was measured from the water surface confined within the PVC well <br /> casing to the top of each respective monitoring well casing. An electronic depth- <br /> sounding instrument was used for this activity. A notch located on top of each <br /> monitoring well casing serves as a permanent reference measuring point. The top of <br /> casing (TOC) elevations, measured depths to groundwater, and groundwater elevation for <br /> each of the three (3)monitoring wells are summarized below in Table 2. <br /> Table 2—Depth to Groundwater(November 18, 2008 <br /> Monitoring Well TOC Elevation Measured Depth to Groundwater <br /> Groundwater Elevation (MSL) <br /> MW-1 5.24 Feet 11.22 Feet -5.98 Feet <br /> MW-3 6.53 Feet 12.37 Feet -5.84 Feet <br /> MW-4 6.00 Feet 12.02 Feet -6.02 Feet <br /> Approximately three (3) casing volumes (9 gallons) of groundwater was purged from <br /> monitoring wells MW-1 and MW-3, and approximately 3 casing volumes (18 gallons) of <br /> groundwater was purged from monitoring well MW-4 prior to collection of groundwater <br /> samples. The wells were purged using a new, disposable bailer for each well. <br /> Groundwater removed from all three (3) monitoring wells was cloudy (grayish mud) and <br /> odorless. Neither floating product nor oily sheens were observed in the groundwater <br /> removed from MW-1, MW-3 or MW-4. <br /> A summary of purge volumes, pH, electrical conductivity, NTUs and temperature <br /> measurements made during well purging activities are presented below in Table 3. <br /> Copies of the Well Monitoring Data Sheets for sampling are included in Appendix B. <br /> 5 <br />