Laserfiche WebLink
' No lighter-end hydrocarbons or fuel oxygenates (BTEX and MTBE) have been detected in <br /> • groundwater samples collected from the site, with TPH-D the only analyte encountered in site <br /> groundwater Substantial migration of TPH in groundwater is not anticipated because of the <br /> fine-grained soils Tables 3 and 5 contain groundwater sample analytical data from the site <br /> 2.2 <br /> Surface Water and Sediment Migration <br /> The nearest surface water is the Upper Main Canal, located approximately 3,600 feet to the south <br /> of the site Most surface water on the site drains into one storm drain drop inlet on the site or <br /> inlets along the street According to the City of Tracy Public Works Department, the storm drain <br /> system eventually drains to the Old River Surface water drainage directions are shown in <br /> Figure 8 Based on the depth of the contaminants of concern, it is not likely that contamination <br /> from petroleum hydrocarbons associated with the former UST system is entering surface water <br /> pathways <br /> r <br /> 2.3 Air Migration <br /> No air samples were collected, since there is no indication that petroleum-impacted vapor or dust <br /> can enter the air pathway The majority of the site has been developed with buildings or paved <br /> lie with asphalt No full basements were observed in any of the surrounding structures Qualitative <br /> field observations at the site have not indicated the presence of any airborne contaminants of <br /> concerns <br /> 2.4 Soil Migration <br /> Each of the former and current site UST locations is paved over and one former location (the <br /> former heating oil UST) is beneath a building slab Site soil TPH concentrations are low <br /> TPH-D was detected at concentration of 5 0 in soil samples collected following the removal of <br /> the diesel UST in March 2002, and up to 2 7 ppm in soil borings completed in September 2002 <br />' No petroleum hydrocarbons were encountered in soil samples collected following the removal of <br /> a 500-gallon heating oil tank in February 2002 Based on the analytical soil data, only minor <br />' concentrations of petroleum-impacted soil are present at the site Tables 1, 2, and 4 summarize <br /> the results of soil samples collected at the site <br /> Soil is visible in the landscaping located along the borders of the site (Photograph 14) The rest <br /> of the site is paved or built up The site was inspected for animal activities such as burrowing <br /> CNCM04-28-031SHARENUS7n03-0027 doc 1 1 <br />