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Page 2 <br /> Mr Michael Infuma Jr,Senior REHS <br /> August 21,2000 <br /> ' UST Related Activities <br /> 1 A 1,000-gallon gasoline UST, located beneath the sidewalk along South Center <br /> Street, an associated fuel dispenser located within the property building, and some <br /> piping were removed in December 1990 On April 17, 1998,the remaining piping <br /> ' that continued from the edge of the building to the former dispenser was properly <br /> abandoned in place <br /> ' On April 16, 1998, Philip performed a preliminary subsurface investigation by <br /> driving two 1-inch diameter Geoprobe-type probeholes beneath the former UST <br /> to collect soil and groundwater samples for laboratory analysis Analytical results, <br /> ' summarized in Philip's June 2, 1998 Preliminary Subsurface Site Investigation <br /> Results and Product Piping Abandonment Completion, indicated benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX) impact to subsurface soil and <br /> groundwater Soil and groundwater samples collected at this time did not contain <br /> detectable oxygenate compounds <br /> In July 1999, Ground Zero Analysis, Inc (GZA) of Escalon, California, <br /> performed another subsurface investigation GZA drilled three soil borings, <br /> completed them as groundwater monitoring wells (labeled MW-1 thorough <br /> 1 MW-3), and collected soil and groundwater samples for laboratory analysis <br /> GZA's investigation, summarized in their July 28, 1999 Groundwater Monitoring <br /> Well Installation Report, detected BTEX and total petroleum hydrocarbon as <br /> gasoline (TPHg) impact in soil and groundwater samples collected at the MW-2 <br /> location Samples collected from MW-1 and MW-2, placed in upgradient <br /> ' positions relative to the former UST, did not contain detectable petroleum <br /> hydrocarbons <br /> The San Joaquin County Environmental Health Division directed that several <br /> quarters of groundwater monitoring be performed to assess evolving conditions <br /> (telephone communications with Mike Infuma, and Philip correspondence to <br /> Mike Infurna dated June 6, 2000) Philip understands that results from these <br /> monitoring events will be used by the County to consider whether future cleanup <br /> actions will be required <br />' Seconduarter 2000 Groundwater Monitoring <br /> g <br /> On June 29, 2000, Philip collected groundwater samples from the three site <br /> monitoring wells Prior to sampling, Philip measured groundwater levels within <br /> the wells with an electronic well sounder, checked for potential free phase <br />