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AT&T - Lodi, Quarterly Groundwater Monitoring Report No 2 <br /> ATC Project No 75 75128 0001 <br /> Page 4, May 4, 2001 <br /> Sample labels Included the following information (1) well number, (2) sample number, (3) date, (4) <br /> collector's irutials, (5) owner, and (6) location Water samples were stored in a chest cooled with ice <br /> Samples were delivered under proper chain-of-custody to a State of California certified laboratory for <br /> analysis <br /> TABLE 4-2 <br /> GROUNDWATER SAMPLING FIELD DATA <br /> March 28,2001 <br /> Sample ID Date Purge Temperatur Conductivity PEI Observed Conditions <br /> No Volume a(°F) (mmholcm) <br /> (gallons) <br /> MW-I 12/18/00 75 648 502 719 Moderately turbid, no sheen <br /> 3/28/01 4.0 68.4 437 NA* Moderately turbid, no sheen <br /> MW-2 12/18/00 70 645 762 798 Moderately turbid, no sheen <br /> 3/28101 40 687 690 NA* Moderately turbid, no sheen <br /> MW-3 12/18/00 70 653 983 706 Moderately turbid, no sheen <br /> 3128/01 35 667 674 NA* Moderately turbid, no sheen <br /> * pH meter inoperative <br /> 4.3 ANALYTICAL METHODS <br /> The following chemical analyses were performed by KtffAnalytical LLC (State Certification No 2236) <br /> on the groundwater samples <br /> n Total Petroleum Hydrocarbons—Diesel Fuel (TPH-D)(EPA Method 8015 Modified), <br />' Benzene, Toluene, Ethylbenzene and Xylenes(BTEX) (EPA Method 6260B), and <br /> n Methyl Tert Butyl Ether(MTBE) (EPA Method 6260B) <br /> Groundwater samples from wells MW 1, 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 <br /> 50 INVESTIGATION RESULTS <br /> 5.1 GROUNDWATER FIELD OBSERVATIONS <br /> Groundwater was encountered in three wells in the study area at depths ranging from approximately 30 <br /> to 31 feet bgs Figure 3 is a groundwater surface contour map This map shows the groundwater <br /> surface to slope In a southerly direction at a gradient of about 0 002 ft/ft <br />