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Mr Brian Cobb <br /> May 9, 1997 <br /> Page 2 <br /> Quarterly Monitoring Results <br /> Depth-to-water measurements and calculated groundwater elevations for April 14, 1997 are <br /> summarized in Table 1 Groundwater elevations and resulting flow direction are shown on <br /> Figure 1 From the data collected on April 14, 1997, the groundwater flow direction was <br /> determined to be toward the southwest The hydraulic gradient across the Site was <br /> approximately 0 002 feet per foot (calculated between wells MW-3 and MW-6) <br /> Analytical results of groundwater samples are summarized in Table 1 and illustrated on <br /> Figure 1 TPHg and BTEX constituents were not identified above the method detection limits <br /> in the samples collected from wells MW-2, MW-6, MW-7 and MW-8 TPHg was identified <br /> in three of the eight wells sampled at concentrations ranging from 53 µg/L to 590 µg/L <br /> Benzene was identified in the sample from well MW-1 at a concentration of 260 µg/L The <br /> analytical laboratory report for the April 14, 1997 sampling event is included in <br /> Attachment A <br /> If you have any questions regarding this quarterly monitoring report, please contact me at <br /> (510) 210-2278 <br /> • Sincerely, <br /> BROWN AND CALDWELL <br /> Todd Miller <br /> California Registered Geologist No 6328 <br /> TM paa <br /> Attachment <br /> cc Mr John Reeves, Attorney at Law <br /> Ms Linda Turkatte, San Joaquin County Health Services Department <br /> E1LRE517215172-01%QTRLYRPTV 00966\1 ST 1997 DOC <br />