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i <br /> MONITORING WELL INSTALLATION AND SAMPLING <br />' Comfort Air, Inc. <br /> 1607 Turnpike Road <br />' Stockton, CA <br /> May/June 1994 <br /> I <br />' lA 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) Four previously installed wells were also monitored <br /> The purpose of the investigation was to determine the lateral extent of groundwater <br /> contamination This report describes the activities performed during the second quarter of <br /> 1994 and presents the results of these investigations <br /> 2.0 BACKGROUND <br /> 2.1 Site Location <br /> I The Comfort Air facility is a heating and air conditioning sales and repair business located <br /> in a topographically flat area of southwestern Stockton The surrounding area is 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 Tank Removal and Monitoring Well Installation <br /> IIt is our understanding that a 550-gallon underground storage tank was removed from the <br /> site in 1989, and that gasoline contamination was detected in two soil samples collected from <br /> I the excavation at the time 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 /> Edirection 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 /> G"bV-1 tim�, �.1K 1 <br /> C..&.1 MW L.u�sr sna.yn...1s9. <br />