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y, <br /> �"�'°a+yr-�"'��.�.•+--.r,.��re,+x;�nhw«.w..w..,,.-....P...._� ..- -...�.....,...:+-+...»wtw*�,..�;��_ .�........<�++ro;ieHeww.,..._....,......_.... ��..... ,.,.,,.�..r�[�Y �t� +" . <br /> PHASE 1 HYDROGF.oLOGIC INVESTIGATION -� �y y'e', <br /> 4491 West Durham Fury Road,Tracy.California r s <br /> { Delta Project No.40.91-732 <br /> t Page 7 ,p <br /> Chemical analyses of the ground water from monitoring wells MW-1 and MW-2 indicated the presence <br /> five( Concentrations of benieaa arae <br /> f .. (�", TPH as gasoline-at concentrations of 140 and 6,400 fib, t� Y• <br /> detected in monitoring wells MW-1 and MW-2 at 2.3 and 710 ppb,respectively(Table 4) Copies of the' i .r <br /> certified-laboratory reports are presented in Appendix E. <br /> 4.0 ABY <br /> Based on the soil samples collected at 5-foot intervals at the three monitoring well locations,the site appears,-.,- <br /> to be underlain by sandy silt with a 2-foot-thick fetes of sand at approximately 3 feet below:the gmuad '+ <br /> surface. The water table was observed to be approximately 10 feet below the ground surface 'I7ie dirt cdon <br /> of ground water flow was calculated to be toward the northeast at a gradient of approximately 0.006-Coot`} <br /> per foot. "s <br /> s 'fi '" .. <br /> yt <br /> k r� TABLE 3 <br /> Chemical Analysis of Soil Samples y�r• <br /> t Concentrations in Milligrams ver1{'slogram mg/kg(ppm) <br /> ,01 <br /> Sample Date Sample Depth <br /> ! t- Ethylbenzetle Xylenes ,� E ' 9 '�' <br /> MW-2 08/2$/91 5 0,013 0.0I8 <0.005 0.02 <0.005 <0.005 <0 S <br /> ��. ,. <br /> iVIW-3 0888191 10 <0.005 <0.OQ5 <0.005 <0.005 <0 005';<0.005 <0 5 .; <br /> a1,2 Diel -'oethane <br /> bEthylene dribromide. t �' <br /> ' cTotai petroleum hydrocarbons. <br /> PHIWLOP <br /> i <br /> t i <br /> ..... y_ _ . .. _.. ..__ _., �.- . � .. ,. _...�._...-.,tom•„.- <br />