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Geo-Probe Soil Boring Sampling Results 3 <br /> 9909 E.Woodward Avenue, Manteca <br /> 02/15/00 <br /> Groundwater Samples <br /> Results from the groundwater sample analysis are included on the attached Site Sketch Map. <br /> Low levels of dielectric oil range petroleum hydrocarbons were detected in samples from the <br /> two downgradient Geo-Probe borings (634 ppb from SB-8 & 193 from SB-9). Non- <br /> detectable amounts of TEPH range petroleum hydrocarbons were present in the samples <br /> collected from SB-11 and SB-12. Analytical Results of groundwater samples from SB-10 will <br /> be discussed more fully upon installation of the two groundwater wells and the completion of <br /> the subsequent report describing that work. <br /> Monitoring Well Locations <br /> Based upon the completion of Geo-Probe borings, it appears that a monitoring well located <br /> slightly further down gradient from SB-8 may provide a non-detect groundwater sampling <br /> point (MW-6) at the distal end of the groundwater plume, given that the hydrocarbon levels <br /> from SB-8 & SB-9 were fairly low (634 & 193 ppb, respectively). The reason that the <br /> groundwater sample from SB-8 had a slightly higher contaminant level than the one from SB- <br /> 9 may be that the groundwater sample was collected from a shallower interval from SB-8 than <br /> in SB-9. MW-7's location provides a zero line to the south, fully bounding the contaminant <br /> plume to the south, given the non-detectable levels from SB-11 and SB-12. <br /> If you require additional information, please call me at (209) 569-0293. We appreciate your <br /> help in this matter. <br /> Respectfully submitted, <br /> Geo-Phase vironmental Inc. <br /> Stephen M. Lankford <br /> Registered Geologist #4283 <br /> Attachments: <br /> 1. Site Sketch Map <br /> 2. Analytical Data <br /> cc: John Welch <br /> Francis Dapaah, Panelized Structures <br /> Jeff Wong, SJC-PHS-EHD <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0293 <br />