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j � • <br /> Page 2 <br /> Mr Michael Infurna Jr,Senior REHS <br /> September 24,2001 2 7 <br /> L leaking UST case, is located about 1 block to the north on the east side of South <br /> Center Street The closest private residence to the former UST area is situated <br /> about 150 feet to the southwest The closest surface water body is the Mormon <br /> Slough, located about 4,500 feet to the north <br /> PREVIOUS UST RELATED WORK <br /> A 1,000- allon gasoline UST located beneath the sidewalk <br /> g g 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, PSC drove two 1-inch diameter Geoprobe probeholes (PH-1 <br /> and PH-2)beneath the former UST to,collect soil and groundwater samples for <br /> laboratory analysis Analytical results, summarized in PSC's June 2, 1998 <br /> Preliminary Subsurface Site Investigation Results and Product Piping <br /> Abandonment Completion report, indicated that benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) compounds impact subsurface soil and groundwater Soil <br /> and groundwater samples collected at this time did not contain detectable <br /> 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 (MW-1 through MW-3), and <br /> collected soil and groundwater samples for laboratory analysis GZA's <br /> investigation, summarized in their July 28, 1999 Groundwater Monitoring Well <br /> Installation Report, detected BTEX and total petroleum hydrocarbon as gasoline <br /> (TPHg) impact in soil and groundwater samples collected at the MW-2 location <br /> (see Figure 2) Samples collected from MW-1 and MW-3,placed in hydraulically <br /> upgradient positions relative to the former UST, did not contain detectable <br /> petroleum hydrocarbons <br /> The San Joaquin County Environmental Health Division (County) directed that <br /> several quarters of groundwater monitoring be performed to assess evolving <br /> conditions PSC has since performed groundwater monitoring at the site in June <br /> and October of 2000 and in January, April and July of 2001 Results of these <br /> groundwater monitoring events were duly submitted to the County <br />