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to SJCEHD on May 14, 2002 in the March 2002 Subsurface Site Investigation <br /> Report The report Included the following highlights <br /> • Subsurface soils In the vicinity of the site were primarily composed of <br /> silt and clay to at least 50 feet <br /> 1 • Groundwater was first encountered In a clayey matrix, typically at 30 <br /> to 35 feet below grade Groundwater was slow to yield, but typically <br /> rose under confined pressure to about 23 to 25 feet below grade <br /> • Groundwater flow was easterly at a gradient of approximately 0 0026 <br /> foot per linear foot <br /> • BTEX concentrations in soil samples collected from the vadose zone <br /> were lower than concentrations In the soil samples collected below <br /> groundwater <br /> • TPH-G concentrations In soil samples collected from the vadose zone <br /> were higher than those obtained below groundwater The data suggest <br /> degradation of BTEX in the vadose zone <br /> • The lateral extent of petroleum-Impacted soil appeared to be narrowly <br /> confined in the vicinity of the former UST The vertical extent of <br /> Impact was approximately 50 to 55 feet <br /> • Oxygenate compounds have not been detected in any soil sample <br /> • BTEX and TPH-G concentrations in groundwater at the MW-2 <br /> location were elevated <br /> 1 • BTEX and TPH-G concentrations In groundwater at the MW-1, MW- <br /> 3, MW-4, and PH-8 locations were relatively low or were not detected <br /> • BTEX and TPH-G concentrations In groundwater at the PH-6 and PH- <br /> 7 locations may be a result of previous retail gasoline operations at the <br /> 1725 El Dorado Street property <br /> 0 Oxygenate compounds TBA, MTBE, and D1PE have been detected <br />' sporadically in groundwater samples <br /> SJCEHD concurred with PSC's Investigation findings and requested a work <br /> plan to remediate the site to "pre-release" conditions in their June 11, 2002 <br /> correspondence PSC submitted a Pilot Testing Work Plan to SJCEHD on <br /> July 23, 2002 The plan presented remedial alternatives and proposed <br />' performing an air sparging and soil venting pilot test to evaluate that method <br /> 3 <br /> Quarterly Groundwater Monitoring Report <br /> March 2005 <br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by Philip Services Corporation <br /> 1 Inventgativ and Quarterly Repon llst Quartaly Repoli 03_2009(final) September 23,2005 <br />