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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 15, 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 15, 1997 groundwater was determined to be <br /> flowing to the northwest under a hydraulic gradient of 0 0015 feet per foot (calculated <br /> 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 their analytical method <br /> reporting limits in the samples collected from wells MW-3, MW-7, and MW-8 TPHg was <br /> identified in the samples collected from the remaining five wells at concentrations ranging <br /> from 55 micrograms per liter (µg/1) to 6,000 µg/1 Benzene was identified in the samples <br /> collected from wells MW-1, MW-2, and MW-5 at concentrations ranging from 2 4 µg/1 to <br /> 43 µg/1 Toluene, ethylbenzene, and xylenes were also identified in samples collected from <br /> four of the eight wells at concentrations ranging from 16 µg/1 to 1,400 µg/1 The analytical <br /> laboratory report for the April 15, 1997 sampling 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 /> 11 <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 Public Health Services Department <br /> , <br /> I <br /> R I <br /> SII E E,II �II <br /> I , I <br /> E.LRE1 515172-05IQTRLYRPI110n7M1ST 1997 DOCI <br />