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"VY • %T C; A S S O C I A T E S I N C . Interim Remediation Plan Raymond Former Greer Construction ' 15634 Steinegul Road Escalon, California ATC Project No. 54.2529 1.0001 1.0 INTRODUCTION ATC Associates Inc. has prepared this Interim Remediation Plan for the proposed remediation system at the Former Greer Construction facility in Escalon, California. The proposed remediation ' system is designed to remediate petroleum hydrocarbon impacted soil and groundwater at the site. The hydrocarbons of primary concern are total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether (MTBE). While other hydrocarbon constituents have also been detected at the site, the extents and concentrations are generally less of a concern than TPHg, benzene, and MTBE. ' 2.0 SITE DESCRIPTION AND BACKGROUND ' The site is located on the eastern side of Steinegul Road and south of Lone Tree Road in Escalon, California, as shown on Figure 1. The site vicinity is primarily residential and agricultural, and the site is currently occupied by a single-family residence. The location of the existing monitoring ' wells, vapor extraction wells, building, former underground storage tanks (USTs), and other pertinent features are shown on Figure 2. ' 2_1 Underground Storage Tanks In May 1987, one 550-gallon gasoline underground storage tank (UST) and one 1,000-gallon ' gasoline UST were removed from the site by H&H Ship Service. The former locations of the USTs are shown in Figure 2. The USTs were transported and disposed of at the Levin Metal Corporation disposal site in Richmond, California. A soil sample collected from beneath the 1,000-gallon UST contained detectable concentrations of benzene, toluene, ethyl benzene, and xylenes (BTEX) constituents. ' 2_2 Regional Geology and Hydroaeology ' Escalon, California is located in the San Joaquin Valley, the southern extension of the California Great Central Valley (Figure 1). The Great Central Valley is a deep alluvial plain extending nearly 500 miles from the Siskiyou Range of the Cascade Mountains in the north to the ' Tehachapi Range to the south. At Escalon, the San Joaquin Valley is approximately 40 miles wide. The western Valley boundary consists of the low, rolling foothills of the California Coast Range Mountains (maximum elevation due west is less than 3,000 feet) and the eastern boundary ' s:\environmental\252911reports\irp.doc