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AT <br /> 11T -Lodi <br /> ATC Project No 75 75128 0001 <br /> Page 5, January 19, 2001 <br /> Following the purging and 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 <br /> rope Upon retrieval of the bailer, sample containers were filled using the bailers disposable <br /> polyethylene bottom-emptying device <br /> ' Sample labels included the following information (1) well number, (2) sample number, (3) date, (4) <br /> collector's ttutials, (5) owner, and (6) location Water samples were stored to a chest cooled with ice <br /> Samples were delivered under proper chain-of-custody to a State of California certified laboratory for <br /> analysts <br /> ' TABLE 4-2 <br /> GROUNDWATER SAMPLING FIELD DATA <br /> ' December 2000 <br /> Sample ID Purge TempLratule (onduetnity PH Observed Conditions <br /> No Volume (OF) (11111lilo/enl) <br /> MW-1 75 648 502 7 19 Moderately turbid, no sheen <br /> MW-2 70 645 762 798 Moderately turbid, no sheen <br /> MW-3 70 653 983 706 Moderately turbid, no sheen <br /> 4.3,4 WELLHEAD SURVEY <br /> After the groundwater monitoring wells were installed, the locations and relative surface elevations of <br /> the tops of the well casings were measured by ATC using a stadia survey The elevation of the top of <br /> ' well MW1 was arbitrarily set at 37 feet, the approximate surface elevation of the site based on the <br /> USGS Lodi North 7 5' Quadrangle 1967 (photorevised 1980) Well MW2 was measured at 37 01 feet <br /> and well MW3 was measured at 37 73, relative to well MW 1 <br /> 4.4 ANALYTICAL METHODS <br /> The following chemical analyses were performed by Kiff Analytical LLC (State Certification No <br /> (2236) on groundwater samples and drummed soil cuttings <br /> Total Petroleum Hydrocarbons— Diesel Fuel (TPH-D) (EPA Method 8015 Modified), <br /> Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) (EPA Method 6260B), and <br /> Methyl Tert Butyl Ether(MTBE) (EPA Method 6260B) <br /> ' Groundwater samples from wells MW I, MW2, and MW3 were tested for these constituents to screen <br /> for diesel fuel which is believed to have escaped from the underground storage tank formerly located <br /> onsite Soil samples from drummed cuttings were tested for these constituents to profile them for <br /> disposal <br />