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Mr. Frank Ryan. Page 2 <br /> Review of the tank removal soil sampling analyses indicates the presence of petroleum hydrocarbons beneath the l <br /> UST. The soil samples were obtained from a depth of 12 feet. Monitoring Well 3 was drilled in the former UST <br /> excavation. Analysis of the soil sample which was obtained from a depth of 10-11.5 feet indicates the presence of <br /> petroleum hydrocarbons. Based on the concentration of remaining petroleum hydrocarbons and the depth to <br /> groundwater at this site remediation'of the former UST excavation is required under Title 23 as interpreted in the <br /> LUFT manual and the Tri-Regional Guidelines. <br /> The abandoned drinking water well is located between MW-5 and MW-b. The concentration of Diesel in the area <br /> of the abandoned drinking water well may be between 400 and 800 ppb. The well must be destroyed in a manner <br /> which will prevent hydrocarbon contamination of the deeper confined aquifers. <br /> PHS/EHD requires a remedial action workplan to address the groundwater plume and the soil contamination in the <br /> former UST excavation by April 15, 1995. <br /> A workplan for destruction of the abandoned drinking water well may be delayed until after the historical well <br /> installation document search is completed. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 3 <br /> Steven Sasson, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> cc: Elizabeth Thayer, CRWQCB <br /> cc: Barbara Andersen, SWRCB <br /> cc: Lee Delano, WHF, Inc. <br /> 3 <br />