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f <br /> - 0 ' <br /> r E <br /> o2 <br /> Durham f <br /> 4491 Wert Dham Ferryad,RoTracy.California <br /> A - <br /> Ddra projcd No.40-9t-732 <br /> page 7 - <br /> PW <br /> : water from monitoring wells MW-1 and MW-2 indicated the preaerloz of <br /> Chemical analyses of the grow d { <br /> gasoline at concentrations of 140 and 6,400 ppb, respectively. Concentrations of betszeae ass i <br /> P" TPH as gasp• able 4 <br /> detected is monitoring wells M -1 and MW-2 at2.3.and 710 ppb,respectively fT )• Copisa of the :.. . <br /> certified-laboratory reports are presented in Appendix E. <br /> a n�cITMMAitY - <br /> the three monitoring well locations.the site appe Based on the soil samples collected at 5-foot intervals at trs :•.,.r::r: <br /> .• <br /> to be underlain by sandy silt with a 2-foot-thick lens.of sand at approximately 3 feet below the grwnd <br /> i roximatei 10 feet below <br /> the ground surface. The direc#ioa <br /> 4: surface. The water table was observed to be app Y approximately 0.005-foot <br /> of ground water flow was calculated to be toward the northeast t,t a gradient of appro ' Y. <br /> per foot. ! <br /> TAULE 3 <br /> r1 i' <br /> • Chemical Analysis of Sail Samples <br /> i .. <br /> "J Concentrations in Milligrams ver aogfam mg/kg(ppm) i <br /> Sample Date Sample Depth �� Frh�Th !+ar.?+P iyj4II�t <br /> p .,l 11e�l? � TQl,ne <br /> 0.013 0 <br /> S <br /> <0.005 0.02 <0.005 <0.005 <0.5 <br /> .01 E <br /> �, . • <br /> MW-2 OSR8/91 <0.005 <0.005 <0.005 <0.005 <0.5 i <br /> MW-308/28/91 10 <0.005 <0.005 1 <br /> '1,2 Dir.; 'oethane <br /> bEthylene dribromide. ' <br /> I c Totai petroleum hydrocarbons. <br /> 1.: <br /> Wd <br /> t <br /> ;.t <br /> PH',0o1.BP <br /> it <br /> it <br /> If <br />