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I San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report . Groundwater movement beneath the SITE is approximately westerly, towards the San Joaquin Delta region Based on data provided by the City of Stockton Department of Public Works, the groundwater gradient in the vicinity of the SITE is relatively flat, with a shallow gradient similar to the land surface gradient According to Mr Elmer Fowler with the California Water Company, which provides domestic water supplies to northern Stockton, groundwater appears to be unconfined, although due to the fine-grained nature of the shallow sediments, there may also be perched zones In the city of Stockton, potable groundwater pumped from municipal and domestic water wells is mixed with imported water However, these water wells reportedly extend to a depth of 500 feet bgs Potentially fresh water-beanng sediments extend from the surface, down to depths of at least 3,000 feet bgs, with municipal water wells extending down to depths of approximately 500 feet bgs However, scattered isolated regions of shallow perched groundwater may also occur within the area due to the heterogeneous lithologic nature of the underlying sediments The SITE is located in the Delta sub-region along the northern margin of the San Joaquin Valley 1 ground water basin, within the northern portion of the San Joaquin Basin Hydrologic Study Area Areas to the north and west of the SITE, in the San Joaquin delta region, report rising saline water levels which have diminished shallow groundwater quality However, sea water intrusion 1 has not yet extended to the vicinity of the SITE 4.0 OBJECTIVE ' The objective of the scope of work is to • Obtain closure for the removal of one (1) 1,000 gallon waste oil UST and in-place abandonment of a second 1,000 gallon UST, and ' • Obtain soil and groundwater hydrological and analytical data to assess the extent (if any) of petroleum hydrocarbons beneath the SITE 5.0 SCOPE OF WORK The scope of work that TEM developed to meet the objectives consisted of the following tasks • Permitting and Agency Notification, • Prepare Health and Safety Plan, • Removal and/or Abandonment of two (2) UST's, • Drilling and Sampling, g, • Monitoring Well Installation and Development, a Groundwater Monitoring and Sampling, 2