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Mr. Michael J. Infuma, Jr. <br /> San Joaquin County Environmental Health Department <br /> February 10, 2003 <br /> Page 2 of 2 <br /> U.S. EPA Method 8015, and dissolved lead using U.S. EPA Method 6010B. Analytical <br /> results are attached. <br /> 12DCA, BTEX, and oxygenates were non-detects (NDs) except for DIPE„which was detected <br /> at 0.88 micrograms per liter Qig/L), a concentration near the laboratory's practical quantitation <br /> r limit. There is no California drinking water standard (Maximum Contaminant Level) or U. S. <br /> Environmental Protection Agency's Preliminary Remediation Goal for DIPS. TPHg was ND <br /> in the sample. Dissolved lead was detected at 4.3 µg/L. Analytical results of the soil sample <br /> collected at about 40 feet bgs from the original boring B3-5 were NDs in BTEX and TPHg. <br /> Based on these data, the vertical extent of petroleum hydrocarbons in soil and groundwater at <br /> the site is limited to about 36 feet bgs with the high concentrations of PHCs primarily limited <br /> to an interval between about 15 and 25 bgs. These results are consistent with previous site <br /> assessment data. Therefore, a deep well (greater than 40 feet bgs) at this site is neither <br /> warranted nor necessary. <br /> If you have any questions, please call me at (559) 264-2535. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> Veen Chee Foong, PE <br /> Senior Engineer <br /> Attachments—Laboratory Analytical Results <br /> I <br /> 3 <br />