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16 <br /> Page 2 <br /> Mr Michael Infurna Jr, Senior REHS <br />' May 11,2001 <br /> UST Related Activities <br /> 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 the <br /> portion of product piping from the UST to the building were removed in <br /> December 1990 The remaining product piping, from the edge of the building to <br />' the former dispenser, was properly abandoned on April 17, 1998 <br />' On April 16, 1998, Philip drove two 1-inch diameter Geoprobe-type probeholes <br /> beneath the former UST to collect soil and groundwater samples for laboratory <br /> analysis Analytical results, summarized in Plulip's June 2, 1998 Preliminary <br />' Subsurface Site Investigation Results and Product Piping Abandonment <br /> Completion, indicated potential benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) impact to subsurface soil and groundwater Soil and groundwater <br />' samples collected at this time did not contain detectable oxygenate compounds <br /> In July 1999, Ground Zero Analysis, Inc (GZA) of Escalon, California, <br /> performed a subsequent subsurface investigation GZA drilled three soil bonngs, <br /> completed them as groundwater monitoring wells (labeled MW-I through <br /> 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 (see Figure 2) Samples collected from MW--1 and MW-2, placed in <br /> upgradient positions relative to the former UST, did not contain detectable <br /> petroleum hydrocarbons <br />' The <br /> San Joaquin County Environmental Health Division directed that several <br />' quarters of groundwater monitoring be performed to assess evolving conditions <br /> Philip understands that results from these monitoring events will be used by San <br /> Joaquin County to consider whether future cleanup actions will be required _ <br /> Second Quarter 2001 Groundwater Monitoring <br /> On April 18, 2001,Kleinfelder, Inc (under Philip's direction) collected <br /> groundwater samples from the three site monitoring wells Prior to sampling, <br />' Kleinfelder's geologist measured groundwater levels within the wells with an <br /> electronic well sounder, checked for potential free phase petroleum product, and <br /> then purged a minimum of three well volumes from each well with clean, <br />' disposable bailers Free phase petroleum product was not observed in any of the <br />