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F 0 C-1 <br /> Subsurface Investigation and Page 6 <br /> " Remedial Excavation of Hydrocarbon-affected Soil <br /> Proposed Cintra Park Phase II Development, Tract 2705, Tracy, California <br /> F. August S, 1997 _ CTE Job No. 20-0445 <br /> �-- associated with the encountered septic disposal system lines. Presented on Figures 4 and 5 is the <br /> encountered soil stratigraphy. <br /> Where readily observed it appeared that an inverted cone of hydrocarbon-affected had formed <br /> beneath the tank cavity area. Hydrocarbon-affected soil also appeared to have spread laterally via <br /># # the septic system trench(which traversed the excavation area)and along the capillary frin a soil zone <br /> p g <br /> above the groundwater table. Based on visual observations where lateral spreading had occurred via <br /> 1 . <br /> the capillary fringe the zone of affected soil was approximately one to two feet thick. <br />� 1 <br /> r <br /> r .4 Soil Sample Collection and Analysis <br /> r-- Soil samples were collected to: to observe the subsurface stratigraphy; evaluate the horizontal and <br /> vertical extent of soil contamination by petroleum hydrocarbons; and, to confirm that hydrocarbon <br /> 1" <br /> affected soil was successfully excavated. Soil sample locations are shown on Figures 3 through 5. <br /> Soil sample procedures are provided in Appendix D. <br /> f f <br /> Selected soil samples were analyzed in the field usinga combustible as indicator <br /> g (CGI). Soil samples <br /> for CGI analysis were numbered sequentially as CGI#1 through CGIV. Presented on Figures 3 <br /> through 5 are the results of the CGI analyses. Selected soil samples were also submitted to the State <br /> of California-certified Chroma Laboratory and analyzed for TPH-G and-D, BTEX, and methyl tert <br /> butyl ether (MTBE). Soil samples for laboratory an 1 sis were numbered sequentially as SS# <br /> 1 <br /> F APROJECT5120-04451ENRP02.WPD <br /> i <br /> Fi <br />