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CHRONOLOGY <br /> 401 S. LINCOLN STREE , STOCKTON <br /> 07/21/99 Date of Preliminary.Site Assessment Work Plan to assess potential <br /> presence of petroleum hydrocarbon impact from former site <br /> operations including two former underground storage tank (UST) <br /> locations. <br /> 07/30/99 During investigation proposed in 7121199 work plan an abandoned <br /> UST was found with contents. <br /> 08/23/99 Date of Preliminary Site Assessment Report. Soil contamination in <br /> area of former UST. Soil and gr undwater contamination found in <br /> another area of unknown source. <br /> 09/16/99 UST found 7130199 was removed under permit and inspection of <br /> Environmental Health. Soil samples were collected beneath the <br /> UST and the piping. <br /> 09/24/99 Date of UST Removal Report. No contaminants were detected in <br /> the soil beneath the UST. TPH- as at 110 ppm was detected in the <br /> soil from beneath the piping. An unauthorized release report was <br /> filed. <br /> 11/08/99 Date of work plan to install three monitoring wells and bore three <br /> holes with collection of water sarnples from two of the borings. <br /> 1216-7199 Installation of three monitoring viells and 2 soil borings. <br /> 01/11/00 Date of Site Investigation Report on work performed December <br /> 1999. MW 1 in area of former UST removed prior to 1984. MW2 in <br /> area of UST removed September 1999. MW3 downgradient of <br /> MW2. Unknown source area had TPH and BTEX in the grab <br /> groundwater sample and soilsamples. <br /> 06/13/00 Date of Quarterly Monitoring Report for June 2000 sampling. <br /> 11/03/00 Date of Quarterly Monitoring Report for October 2000 sampling. <br /> 02/13/01 Date of Quarterly Monitoring Report for January 2001 sampling. <br /> 07/18/01 Environmental Health received No Further Action Request". <br /> Included 2000 feet radius wellsurvey. <br />