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r ���.� 2��0 <br /> 1260 Graphics DfIVE <br /> Modesto California <br /> TA' -^ 9 95351 <br /> 209 579 2221 <br /> r <br /> 1 101 ? Fax 209 579 2225 <br /> A S S O C I A T E S I N C <br /> 2,'; <br /> ua <br /> February 24, 1998 <br /> 94367 <br /> Ms Margaret Lagono <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject Fourth Quarter 1997 Status Report, Fire Engine Company No 2, 110 West <br /> Sonora Street, Stockton, California <br /> Dear Ms Lagorio <br /> This letter report summarizes the results of the environmental investigation conducted during the <br /> fourth quarter 1997 by ATC Associates Inc (formerly Smith Technology Corporation) at the <br /> subject site (Figure 1) The work was conducted at the request of the City of Stockton, <br /> Department of Public Works (City of Stockton) and included measuring depths to groundwater, <br /> collecting groundwater samples from the monitoring wells for subjective and laboratory analyses, <br /> and evaluating the groundwater gradient and direction of groundwater flow beneath the site In <br /> addition, groundwater samples were also collected from vapor wells, the recovery well, and the <br /> piezometer at the direction of Mr Steve Sasson of San Joaquin County Public Health Services <br /> Environmental Health Division (PHS/EHD) <br /> BACKGROUND <br /> In April 1987, a 1,000-gallon unleaded gasoline tank was removed and residual hydrocarbons <br /> were detected in the soil remaining under the former tank In April 1992, a 250-gallon waste oil <br /> tank was removed The locations of the former and existing tanks are shown on Figure 2 In <br /> 1988, the City of Stockton contracted RESNA Industries Inc to conduct a subsurface <br /> investigation to assess the extent of residual hydrocarbons in soil The investigation included <br /> drilling seventeen soil borings, installing five groundwater monitoring wells, five vapor extraction <br /> wells, one piezometer, and one recovery well, collecting and analyzing soil and groundwater <br /> samples, monitoring fluid levels in the wells, performing a groundwater aquifer test, and <br /> performing a soil vapor extraction test <br /> w 194367594367-1014QSR97doc I <br />