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Hyl <br />Mr. Alan Biederman <br />San Joaquin County Environmental <br />Health Department <br />P.O. Box 2009 <br />Stockton, California 95201 <br />Hydro -Search, Inc. <br />333 Flint St. • Reno, Nevada 89501 <br />HYDROLOGISTS -GEOLOGISTS -ENGINEERS <br />Phone (702) 322-4173 <br />July 11, 1988 <br />---.-AL HEALTH <br />Subject: Drilling and Water Quality Analysis Results from Investigation <br />at Foothill Landfill, San Joaquin County <br />Dear Mr. Biederman: <br />Pursuant to my letter of April 12, <br />analysis data and drilling logs from <br />Landfill in San Joaquin County. <br />1988, I am enclosing water quality <br />our investigation of the Foothill <br />During our field investigation, HSI drilled three boreholes shown as MW -1, <br />-2, and -3 on the accompanying Figure 2. The logs of these boreholes are <br />enclosed. Only MW -1 was ever constructed as a well, and it was drilled <br />out the following day because the formation was dry. The resulting hole <br />was filled with neat cement to land surface; the cement was tremied into <br />place. Boreholes MW -2 and -3 were dry throughout drilling and were filled <br />with cement immediately upon completion of drilling. <br />One water sample was collected for analysis from the Foothill Landfill. <br />The sample was collected from the water supply well on site which is used <br />primarily for fire control and dust suppression. The initial sample <br />showed minor traces of tricholorfluoromethane. HSI's field blank also <br />showed similar contamination, which indicated that the first sample was <br />either somehow contaminated in the field during collection or was subject <br />Reno 0 Denver 0 Milwaukee <br />