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MONITORING WELL INSTALLATION AND SAMPLING <br /> October 1993 <br /> Comfort Air, Inc. <br /> 1607 Turnpike Road <br /> Stockton, CA <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr Gregory Gaut of Comfort Air, Inc , Geological Audit <br /> Services, Inc (GeoAudit) has installed and sampled one monitoring well at 1607 Turnpike <br /> Road in Stockton, California (the site) Three previously installed wells were also <br /> monitored The purpose of the investigation was to determine the lateral extent of <br /> groundwater contamination This report describes the activities performed during the fourth <br /> quarter of 1993 and presents the results of these investigations <br /> 2.0 BACKGROUND <br /> 2.1 Site Location <br /> The Comfort Air facility is a heating and air conditioning sales and repair business located <br /> lollin a topographically flat area of southwestern Stockton The surrounding area 1s residential <br /> and light industrial The Port of Stockton lies approximately two miles northwest of the site <br /> (Figure 1) A plan of the site is illustrated in Figure 2 <br /> 2.2 Previous Work <br /> It is our understanding that a 550-gallon underground storage tank was removed from the <br /> site in 1989, and that gasoline contamination was detected 1n two soil samples collected <br /> from the excavation at the tune of removal RESNA Industries of Escalon, California <br /> subsequently installed three groundwater monitoring wells in February, 1992 and collected <br /> soil and water samples to determine the extent of subsurface contamination and the <br /> direction of groundwater flow <br /> Evidence of soil contamination was detected in all borings below a depth of 20 feet, and <br /> laboratory analysis of samples at 30 and 35 feet revealed slight concentrations of volatile <br /> aromatic hydrocarbons (BTE&X) and total petroleum hydrocarbons in the gasoline range <br /> (TPH-g) Much higher concentrations of these same contaminants were detected in the <br /> groundwater samples, including those from wells MW-1 and MW-2, which are up-gradient <br /> from the tank cavity (Figure 2) Elevated concentrations of hydrocarbons were also detected <br /> in the next sampling event (October 1992) The data indicate that the groundwater has been <br /> impacted by a significant, though unknown, volume of gasoline <br /> x <br />