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i 1.0 INTRODUCTION This report presents a summary of third quarter 1999 groundwater monitoring activities and results at 15634 Stemegul Road(the Site) in Escalon, California Site information is as follows Site Location 15634 Stemegul Road Escalon, California Project Contact Mr Brian Greer 1111 First Street Escalon, California 95320 (209) 838-3593 2.0 SITE DESCRIPTION The Site is a private residence located at 15634 Stemegul Road in the City of Escalon The subject property, comprising approximately 135 acres, is identified as San Joaquin County APN 229-120-04 Figure 1 presents a Vicinity Map of the Site The Site includes a residence, workshop/garage, and adjacent pasture Figure 2, Site Plan, illustrates the developed portion of the Site The Site is bounded by Stemegul Road to the west, a residence to the north, and pasture to the south and east Topography of the area is generally flat I 3.0 PROJECT HISTORY ORY Two regular gasoline underground storage tanks (USTs) and a fuel dispenser island were located between the residence and the workshop, at the approximate locations shown in Figure 2 The USTs had capacities of 550 and 1,000 gallons In September 1986, Precision Industries, Inc conducted precision testing on the two USTs The 550-gallon UST failed and the 1,000-gallon UST passed within the State guidelines In May 1987 the USTs were exhumed and removed from the Site under San Joaquin County permit The USTs were hauled by H&H Ship Service Company to the Levin Metals Corporation disposal site in Richmond, California Precision Industries, Inc obtained one soil sample from each UST excavation The sample from the 550-gallon UST excavation was obtained from a depth of approximately 10 feet below . ground surface (bgs) The sample from the 1,000-gallon UST excavation was obtained from approximately 12 feet bgs Analytical results for the sample from the 1,000-gallon UST slaws Report 07400179 Thrid Quarter i999 1