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TCN Properties, L.P. 6793.4.001.01 <br /> North Lathrop Properties August 28,2006 <br /> QUARTERLY GROUNDWATER SAMPLING RESULTS Page 3 <br /> GROUNDWATER LEVELS <br /> Groundwater data collection commenced following water-level-sensor installation on <br /> September 15, 2005. Figure 3 presents groundwater depths below existing grade for each of the <br /> five wells. Groundwater depths ranged between 4.5 feet below the existing ground surface (bgs) in <br /> the southwest comer of the property at its peak in April 2006, down to 231.6 feet bgs in the <br /> northeast comer at its lowest point in September 2005. As shown on Figure 4, groundwater <br /> elevations) ranged between+5.3 and-10.1 feet throughout the year. The shallowest occurrences of <br /> groundwater were measured in well NMW-5, located in the southwest portion of the site, the <br /> location nearest to the San Joaquin River. Based. on the measured groundwater levels, <br /> groundwater generally appears to flow towards the northeast. <br /> We appreciate the opportunity to be of service to you on this project. If you have any questions, <br /> please contact us. <br /> Very truly yours, <br /> ENGE CORPORATED Reviewed by: <br /> Zac Crawford D an Hickmott <br /> ze/jb:gwsmpi <br /> Attachments: Figures I through 4 <br /> Appendix A-Table I, Summary of Water Quality Data <br /> Appendix B -Laboratory Data Results, California Laboratory Services <br /> Appendix C -Monitoring Well Field Sampling Logs <br /> cc: 1 —Mr. Steven Beck,ECO:LOGIC <br /> I —Mr. Thomas Butler,ECOLOGIC (e-mail only) <br /> All elevations provided in this report refer to NVGD 29. <br />