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AT&T—Loch,Quarterly Groundwater Monitoring Report No 3 <br /> ATC Project No 75 75128 0001 <br /> October 4, 2001 <br /> TABLE 4-1 <br />' GROUNDWATER SURFACE ELEVATIONS <br /> June 28,2001 <br /> Monitoring Date Depth of Weil (feet) Mevatlou of Top of Caaingat Depth to GroundwaterO Gro®dwater <br /> Wen (feet) (reek) Elevadmi" <br /> (feet) <br /> MW-1 12/18/00 3833 3700 2931 769 <br /> 3/28/01 3833 3700 3031 669 <br />' 6128/01 38.33 37.00 27.66 9.34 <br /> MW-2 12/18/00 3803 3701 2940 761 <br /> 3/28/01 3803 3701 3039 662 <br /> 6/28/01 38.03 37.01 27.64 9.37 <br /> MW-3 12/18/00 3843 3773 3019 754 <br /> 3/28/01 3843 3773 3118 655 <br /> 6/28/01 38.43 37.73 28.55 9.18 <br /> Below top of casing <br /> @� Elevataon relative to Datum 37 feet at MW l <br /> M4.2.2 GROUNDWATER SAMPLING <br /> The groundwater monitoring wells were purged prior to sampling The volume of water contained in each well <br /> was calculated using the depth to water and the known depth of the bottom of the well Water and sediment in the <br /> well was removed by repeatedly lowering a bailer into the water column to withdraw water until at least three <br /> well-casing volumes had been removed <br /> The color, clanty, turbidity, pH, temperature, and specific conductance of the water removed from these wells <br /> were recorded during the purging Table 4-2 lists the stabilized parameters Discharge water was contained in <br /> sealed,properly labeled 55 gallon drums until laboratory analytical results were received to guide disposal <br />' Following the purging and water-level recovery of the wells, water samples were collected with a disposable <br /> polyethylene bailer The bailer was lowered Into the center of the water column using a new nylon rope Upon <br /> retrieval of the bailer, sample containers were filled using the bailer's disposable polyethylene bottom-emptying <br /> device <br /> Sample labels included the following information (1) well number, (2) sample number, (3) date, (4)collector's <br /> initials, (5) owner, and (6) location Water samples were stored in a chest cooled with ice Samples were <br /> delivered under proper cham-of-custody to a State of Califortua certified laboratory for analysis <br /> 3 <br />