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i <br /> J <br /> Mr. Brian Cobb <br /> May 31, 1996 <br /> Page 2 <br /> Quarterly Monitoring Results <br /> Depth-to-water measurements and calculated groundwater elevations are summarized in Table 1 / <br /> Groundwater elevations have increased in all of the monitoring wells relative to the previous <br /> quarter. From the data collected on February 22, 1996, the groundwater flow direction was <br /> determined to be northwest. The average hydraulic gradient across the site was approximately <br /> 0 001 feet per foot (calculated between wells MW-3 and MW-6). Groundwater elevations and <br /> flow directions for February 22, 1996 are shown on Figure 1 <br /> TPHg was identified in four of the eight wells sampled at concentrations ranging from 140 <br /> micrograms per liter (µg/L) (well MW-6) to 15,000 µg/L (well MW-5). Benzene was detected <br /> in three of the eight well at concentrations ranging from 24 µg/L (well MW-1) to 60 µg/L <br /> (well MW-5). Analytical results of groundwater samples are summarized in Table 1 and <br /> illustrated on Figure 1. The analytical laboratory report for the February 22, 1996 sampling <br /> event is included in 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 7 <br /> f r <br /> Todd Miller <br /> Cahforcua Registered Geologist No 6328 <br /> TM:lkg <br /> I <br /> ` <br /> Attachment' I ` <br /> ` 1 <br /> cc: Mr. John Reeves, Attorney at Law " <br /> Ms. Linda Turkatte, San Joaquin County Public Health Services Department <br /> Mr. Steve Camp, Brown and Root <br /> I <br /> , I <br /> E l5E5U1TRLYRP %1008'AT11SI'1496 VVPS <br /> �ti <br /> I I !I <br /> I� p,I I"� 'i,II I I I itli II II lh� , II III q VAI� I ill I f IIk II I I iii .I �+ II 'll I I <br />