Laserfiche WebLink
AT&T—Lodi,Quarterly Groundwater Monitoring Report No 3 <br /> ATC Project No 75 75128 0001 <br /> October 4, 2001 <br /> i <br /> TABLE 4-2 <br /> GROUNDWATER SAMPLING FIELD DATA <br /> June 28,2001 <br /> Monitoring Date Purge volume Temperature Conductivity pH Observations <br /> wen (ganons) (OF) (m.h-d—) <br /> MW-1 12/18/00 75 648 502 719 Moderately turbid, no sheen <br /> 3128101 40 684 437 NA* Moderately turbid, no sheen <br /> 6128101 5.5 68.3 505 7.29 Moderately turbid,no sheen <br /> MW-2 12/18/00 70 645 762 798 Moderately turbid, no sheen <br /> 3128/01 40 687 690 NA* Moderately turbid, no sheen <br /> 6128101 5.5 70.6 678 6.34 Moderately turbid,no sheen <br /> MW-3 12/18/00 70 653 983 706 Moderately turbid, no sheen <br /> 3128/01 3 5 667 674 NA* Moderately turbid, no sheen <br /> 6128101 5.5 68.7 700 6.23 Moderately turbid,no sheen <br /> * pH teeter inoperative <br /> 4.3 ANALYTICAL METHODS <br /> The following chemical analyses were performed by Kiff Analytical LLC (State Certification No 2236) on the <br /> groundwater samples <br /> • Total Petroleum Hydrocarbons—Diesel Fuel(TPH D)(EPA Method 8015 Modified), <br /> + Benzene,toluene,ethylbenzc ne and total xylenes(BTEX)(EPA Method 6260B),and <br /> • Methyl tert butyl ether(MTBE)(EPA Method 6260B) <br /> 5.0 INVESTIGATION RESULTS <br />' <br /> 5.1 GROUNDWATER FIELD OBSERVATIONS <br /> Groundwater was encountered in three wells in the study area at depths ranging from approxunately 27 6 to 28 6 <br /> feet bgs Figure 2 is a groundwater contour map Tins map shows the groundwater surface to slope in a <br />' southwesterly direction at a gradient of about 0 004 ft/ft <br /> Groundwater initially removed from each monitoring well was clear with no floating product, no sheen, and no <br /> hydrocarbon odor With continued baiting of the wells, suspended clays and silts were observed in the water <br /> throughout removal of the three well volumes prior to sampling <br /> 4 <br />