ARCHIVED REPORTS_XR0007372 CASE 2

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TABLE 4-1 GROUNDWATER SURFACE ELEVATIONS October 1, 2001 Monitonng Date Depth of Elevation of Top of Depth to Groundwater Well Well (feet) Casinei Groundwatert'1 Elevation"' (feet) (feet) (feet) MW-1 12/18/00 3833 3700 2931 769 3/28/01 3833 3700 3031 669 6/28/01 3833 3700 2766 934 10/1101 38.33 37.00 29.87 7.13 MW-2 12/18/00 3803 3701 2940 761 3128101 3803 3701 3039 662 6/28/01 3803 3701 2764 937 1011101 38.03 37.01 29.92 7.09 MW-3 12/18/00 3843 3773 3019 754 3/28/01 3843 3773 3118 655 6/28/01 3843 3773 2855 918 1011/01 38.43 37.73 30.75 6.98 Below top of casing (b) Elevation relative to Datum 37 feet at MW 1 4.2.2 Groundwater Sampling The groundwater morutoring wells were purged prior to sampling The volume of water contained in each well was calculated usmg the depth to water and the]mown depth of the bottom of the well Water and sediment m the well was removed by repeatedly lowering a bailer into the water column to withdraw water until at least three well-casing volumes had been removed The color, clarity, turbidity, pH, temperature, and specific conductance of the water removed from these wells were recorded dunng the purging Table 4-2 lists the stabilized parameters Discharge water was contained in sealed,properly labeled 55-gallon drums until laboratory analytical results were received to guide disposal Following the purging and water-level recovery of the wells, water samples were collected with a disposable polyethylene bailer The bailer was lowered into the center of the water column using a new nylon rope Upon 1 retrieval of the bailer, sample containers were filled using the bailer's disposable polyethylene bottom-emptying device AT&T-Lodi,Quarterly Groundwater Momtormg Report No 3 NOATC ATC Project No 75 75128 0001 November 14,2001 Page 3 of 7