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S •*' f Y SWTH ENVIRONMENTALTECHNOLOGtESCDAPOAATION March 5, 1997 1-0t^1 94367 =Z - Ms Linda Turkatte = San Joaquin County Public Health Services Environmental Health Division P O Box 388 -- Stockton, CA 95201-0388 Subject First Quarter 1997 Status Report, Fire Engine Company No 2, 110 West Sonora Street, Stockton, California Dear Ms Turkatte This letter report summarizes the results of the environmental investigation conducted during the first quarter 1997 by Smith Technology Corporation at the subject site (Figure 1) The work was • conducted at the request of the City of Stockton, Department of Public Works (City of Stockton) and included measuring depths to groundwater, collecting groundwater samples from the wells for subjective and laboratory analyses, and evaluating the groundwater gradient and direction of groundwater flow beneath the site BACKGROUND In April 1987, a 1,000-gallon unleaded gasoline tank was removed and residual hydrocarbons were detected in the soil remaining under the former tank In April 1992, a 250-gallon waste oil tank was removed The locations of the former and existing tanks are shown on Figure 2 In 1988, The City of Stockton contracted RESNA Industries Inc to conduct a subsurface investigation to assess the extent of residual hydrocarbons in soil The investigation included drilling seventeen soil borings, installing five groundwater monitoring wells, five vapor extraction wells, one piezometer, and one recovery well, collecting and analyzing soil and groundwater samples, monitoring fluid levels in the wells, performing a groundwater aquifer test, and performing a soil vapor extraction test w 194367\94367-1011Q5R97doc 1 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 Engineering Consulting Remediation Construction