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San Joaquin County of Public Works January 15, 1999 <br /> Workplan for Site Assessment <br /> Water Company, which provides domestic water supplies to northern Stockton, groundwater <br /> appears to be unconfined, although due to the fine-grained nature of the shallow sediments, <br /> there may also be perched zones. In the city of Stockton, potable groundwater pumped from <br /> municipal and domestic water wells is mixed with imported water. However, these water <br /> wells reportedly extend to a depth of 500 feet bgs. <br /> Potentially fresh water-bearing sediments extend from the surface, down to depths of at least <br /> 3,000 feet bgs, with municipal water wells extending down to depths of approximately 500 feet <br /> bgs. However, scattered isolated regions of shallow perched groundwater may also occur <br /> within the area due to the heterogeneous lithologic nature of the underlying sediments. <br /> The SITE is located in the Delta subregion along the northern margin of the San Joaquin <br /> Valley ground water basin, within the northern portion of the San Joaquin Basin Hydrologic <br /> Study Area. Areas to the north and west of the SITE, in the San Joaquin delta region, report <br /> rising saline water levels which have diminished shallow groundwater quality. However, sea <br /> water intrusion has not yet extended to the vicinity of the SITE. <br /> OBJECTIVE <br /> The objective of the scope of work is to: <br /> • Assess the vertical and lateral extent of petroluem fuel hydrocarbon in the subsurface. <br /> • Investigate the possibility of any impact to groundwater if encountered during assessment. <br /> SCOPE OF WORK <br /> The scope of work that TEM has developed to meet the objectives includes the following tasks: <br /> Task 1: Permitting, Agency Notification & Traffic Control <br /> A well construction permit for the installation of up to three (3) groundwater monitoring wells <br /> will be filed with the County of San Joaquin Public Health Agency prior to the initiation of <br /> drilling. <br /> The proposed monitoring well locations are presented in Figure 1. The RWQCB and SJCPHC <br /> will also be notified a minimum of three (3) days prior to the start of fieldwork. Underground <br /> Service Alert will be notified a minimum of 48 hours prior to initiating fieldwork for the <br /> demarcation of underground utilities. <br /> 3 <br />