ARCHIVED REPORTS_XR0009355 - Laserfiche WebLink

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In March 1993, IT submitted an "Offsite Investigation Report" to San Joaquin County Public Health Services (SJCPHS), Environmental Health Division, requesting site closure At this time, quarterly monitoring activities were halted, pending data evaluation by the regulatory agency In a letter dated June 1, 1993, SJCPHS representatives requested further investigation ' of soil quality beneath the site building. Quarterly monitoring activities were resumed in July 1993 Upon analysis, no detectable concentrations of petroleum hydrocarbons have been encountered in the samples collected during the July 1993, October 1993, January 1994, March 1994 and July 1994 sampling events. The following report details procedures and findings associated with the recent investigation conducted surrounding the abandoned UST's in the basement of the facility. 2.0 Plan of Action IT performed the soils investigation at the Pacific Bell facility located at 345 North San Joaquin Road in Stockton, California in order to further characterize soil quality beneath the abandoned underground storage tank locations The investigation had the following goals 1 Further examine the vertical distribution of petroleum hydrocarbons in soil near the abandoned tank locations. 2 Provide for future observation of vadose zone soil conditions as necessary 3 Evaluate all results and recommend any further action at the site that may be warranted. 4 Coordinate all field work with Pacific Bell as well as local and regional regulatory agencies To accomplish these goals, IT planned to drill four soil borings ;n locations identified to exanune the distribution of petroleum hydrocarbons near the abandoned diesel tank locations The boreholes were planned to be completed as vadose wells to facilitate future observation of vadose zone soil conditions MZ/09-0&94JUST/940138 mer 3