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iQuarterly Report - First Quarter 2001 COMFORT AIR, INC. 1607 Turnpike Road, Stockton, California 1.0. INTRODUCTION I At the request of Mr Greg Gaut, Advanced GeoEnvironrnental, Inc (AGE) has prepared this quarterly report for Comfort Air,Inc , 1607 Turnpike Road, Stockton, California(site) The location of the site is illustrated in Figure 1, a plan of the site is illustrated in Figure 2 The objective oftheworkwas to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize groundwater flow direction and gradient on the site This report is prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site was included in the Quarterly Report - February 1997, dated IS April 1997, and Monitoring Well Installation Work Plan -July 1998, prepared by AGE 1 1 SITE LOCATION The Comfort Air facility is a heating and air conditioning sales and repair business located at 1607 • Turnpike Road, Stockton, California, in an area of low topographic relief in southwestern Stockton The site is located in section 10, Township 1 north, Range 6 east, Mount Diablo Base and Meridian (Figure 1) The surrounding area is utilized for residential and light industrial purposes The Port of Stockton hes approximately two mules northwest of the site I12 REGIONAL GEOLOGIC SETTING The property is located within the Great Valley Geomorphic Province ofCaliforma, a large, elongate - ' northwest trending, asymmetric structural trough The Great Valley Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat-lying alluvial plain, extending from the Tehachapi Mountains in the south to the I Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the province have not been completely defined but are believed to be metamorphic and igneous in origin The Great Valley Province is subdivided into two major subdivisions designated the Sacramento and San Joaquin Valleys I2 0. PROCEDURES IOn 01 March 2001,groundwater monitoring and sampling was performed at the site on wells MW-1 through MW-8 Contaminants included total petroleum hydrocarbons quantified as gasoline(TPH-g) and benzene, toluene, ethylbenzene and total xylenes (BTEX) I Advanced CeoEnvironmental,Inc I