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The groundwater elevation has risen approximately 1.3 feet since <br /> the last monitoring episode in November 1990 ( Table 2) . The <br /> groundwater gradient is consistent with previous monitoring idata, <br /> flowing in a southwest direction with a gradient The pH, electrical <br /> approximately 4.6 feet 6 Or <br /> per mile (Figure 2) • e l.o s which <br /> conductivity and temperature are noted on field pur g g <br /> are included in Attachment 2. <br /> As described in cur February 4, 1991 Problem Assessment <br /> Repo t <br /> for Sail and Groundwater Contamination (page 5), <br /> re-excavate the former tank pit to remove any remaining soil <br /> contamination at the project site. We anticipate the excavation <br /> to begin in the spring. In addition, to further delineate the <br /> groundwater contamination, we recommend installation of three <br /> additional monitoring wells, positioned down-gradient and later- <br /> ally from well MW2. <br /> An addendum to the Preliminary Report/Workplan will be submitted <br /> to the San Joaquin County Health Depa osenthisnvironmntal additional Health <br /> onal work <br /> Diision by April 15, 1991 to prop <br /> WaterWork will continue quarterly groundwater monitoring of the <br /> site's monitoring wells. Thornton Municipal Well.and the willresbe <br /> sampled and analyzed during thempnitorpnomgThe next quarterly <br /> reported in the quarterly greport. <br /> monitoring report will be submitted by July 20, 1991• <br /> If you have any questions or comments regarding this project, <br /> please contact John P. Lane at our Escalon office 209/838-3507• <br /> Respectfully, <br /> WterWork <br /> P. <br /> r J n P. Lane <br /> Project Geologist <br /> RUS3611 W. Juncal <br /> CA Registered Geologist No. 3864 <br /> LF/tdp/ktt <br /> Attachments <br />