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1.0 INTRODUCTION This report presents a summary of fourth quarter 1999 groundwater monitoring activities and results at 15634 Steinegul Road(the Site) in Escalon, California Site information is as follows Site Location 15634 Steinegul.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 Steinegul 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 Steinegul Road to the west, a residence to the north, and pasture to the south and east Topography of the area is generally flat 3.0 PROJECT HISTORY 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 Stearn Report 07400178-Fourth Quarter 1999 1