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URS <br /> Mr Harlin Knoll Page 6 <br /> San Joaquin County Environmental Health Department <br /> May 19, 2003 <br /> Sensitive Receptors <br /> The nearest municipal supply well (CSDMU well 3-2) is located approximately 2,000 feet south of the <br /> site and is sealed to a depth of 144 feet bgs Well 3-2 is screened from 144 go 376 feet bgs and from <br /> 386 to 625 feet bgs <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Fuel related petroleum hydrocarbons were not detected in groundwater at the two new off-site <br /> monitoring wells (MW-6 and MW-7) The groundwater sample from deep on-site well MW-5 contained <br /> concentrations of TPHg and MtBE that were lower than those reported in shallow on-site monitoring <br /> wells The lithology encountered below the screen interval of MW-5 (from 70 to 98 feet bgs) consisted <br /> of clay and silt <br /> URS recommends additional quarterly monitoring to assess if the vertical and lateral extent of impacted <br /> groundwater has been defined <br /> . If you have any questions or comments regarding this letter, please call Mr Vernon Elarth at (916)679- <br /> 2299 <br /> Sincerely, <br /> D GFS <br /> URS Corporation Americas <br /> �-\`, o IPABOG, <br /> No 7 20 s <br /> Exp i 3/ O <br /> Scott Lookin ill Vernon Elarth, R G <br /> Project Geologist Project Manager 9 OF GAUF <br /> Attachments Table 1 Groundwater Monitoring Data <br /> Figure 1 Site Location Map <br /> Figure 2 Site Map <br /> Figure 3 Geologic Cross Section A.'-A. <br /> Figure 4 Geologic Cross Section B'-B <br /> Figure 5 Groundwater Elevation Contours <br /> Figure 6 Groundwater Analytical Summary <br /> K 1Wprocessll5 BP ARC011 WQ\Well Installationlwell installation report03 dm <br />