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Sciencemental <br /> L aence <br /> Associates ' <br /> SEP 0 1 2004 <br /> ENVIRONMEW hLAL(H <br /> August 30, 2004 PERMIT/SERVICES <br /> Ms Margaret Lagono <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Subject. Revised Groundwater Elevation Data and Contours <br /> Groundwater Monitoring and Sampling Report <br /> University of the Pacific(UOP) Former Underground Storage Tank Site <br /> 1081 W Mendocino Avenue,Stockton, California <br /> Assessor's Parcel Number 113-140-02 <br /> County of San Joaquin Site Code Ro732 <br /> Dear Margaret <br /> As you requested in our recent telephone conversation regarding the closure of the above referenced site, <br /> ESA has reviewed and revised the groundwater elevation data and groundwater flow contours presented in <br /> our Groundwater Monitoring and Sampling Report, Request for No Further Action, dated December 2, <br /> 2003 Upon further review, ESA found unintentional transcription errors in both Table 6 and on the graphics <br /> that depicted the groundwater contours As a result, ESA verified the groundwater elevation data from field <br /> notes and revised Table 6 and Figures 6 through 9 We have attached to this letter the revised Table 6 <br /> (indicating changes) and revised Figures 6 through 9 Please consider this letter,the revised table, and the <br /> redrafted figures an erratum to our December 2, 2003 report <br /> As shown in the figures, the groundwater flow direction and gradient appears to fluctuate seasonally, most <br /> likely influenced by the local hydrology of the Calaveras River Given the small area between the wells, <br /> however, other influences such as landscape irrigation,rainfall infiltration, and local variations in the <br /> geology may also affect flow of groundwater in the immediate area <br /> I appreciate your understanding in this matter and thank you for your careful and thorough review of our <br /> document If you have other questions or data needs to complete the closure documentation, please do not <br /> hesitate to call me or Emily Silverman at(415) 896-5900 <br /> Sincere , <br /> P er B ds G <br /> Senior Geologist <br /> 225 Bush Street Suite 1700 San Francisco California 94104 (4 t5)896 5900 fax 896 0332 email esa sf@esassoc corn <br />