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• v <br /> �nexmn , <br /> Summary <br /> Data was collected at 515 West Charter Way, Stockton, CA using the MIP (Membrane <br /> Interface Probe) and a Geoprobe 6600 at 7 sampling locations, collecting data from the <br /> surface to as deep as 67' bgs An ECD (Electron Capture Detector), PID (Photo <br /> Ionization Detector) and a FID (Flame Ionization Detector) were used with a Hewlett <br />' Packard 5890 Gas Chromatograph <br /> The purpose of this MIP project was to determine if the MIP could provide a better <br />' definition of subsurface contaminant distribution over traditional soil and groundwater <br /> sampling in addition to identify a possible submersed petroleum source area <br /> Contaminant Mass: <br /> ECD detections were noted at all MIP borings ECD detections were primarily located <br /> between 24' bgs to 6l'bgs The highest ECD detection 1 0E+6 was noted at MIP-4 which <br /> was at approximately 59 bgs ECD detections are an indication of halogenated <br /> compounds-- <br /> PID <br /> oin ounPID detections were noted at all MIP borings PID detections were primarily located <br /> between 24' bgs to 61' bgs The highest PID detection 4 0E+7 was noted at MIP-2 which <br /> was noted approximately 46' bgs FID detections are an indication of double bonded <br /> compounds <br /> FID detections were noted at all MIP boring FID detections were primarily located <br /> between 24' bgs to 61' bgs The highest FID detection 14E+7 was noted at MIP-2 which <br /> was noted approximately 45' bgs FID detections are an indication of combustible Z <br /> hydrocarbons <br /> Soil Conductivity: <br /> A lower conductive or higher permeable zone was noted from 42' bgs to 60' bgs The <br /> conductivity of soils is different for each type of media Finer grained sediments, such as <br /> silts or clays, will have a higher EC signal While coarser grained sediments, sands and <br /> gravel, will have a lower EC signal <br /> Confirmation Samples: <br /> Based on soil confirmation results and information provided by Shaw E&I, ECD, PID, <br /> and FID responses are a result of petroleum hydrocarbons Detector responses primarily <br />' are located between 24' bgs to 61' bgs MIP-4 and MIP-5 seemed to have shallower <br /> detection responses in comparison to all other MIP borings This would be consistent <br /> with the prior location of one of the former UST tanks illustrated on page 6 of this report <br /> Confirmation soil analytical results indicate a good correlation with PID and FID results <br /> and support the location of majority of contaminant mass at the site between 24' to 60' <br /> bgs <br />' <br /> Page 32 of 32 <br />