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i INTERIM WORKPLAN: VAPOR TEST / EXTENDED PURGE Lockeford Beacon 13975 East Highway 88 Lockeford, CA September 1994 I1.0 INTRODUCTION In accordance with a request from Mr Robert Phillips of Lockeford Beacon, Geological Audit Services, Inc (GeoAudit) has prepared this interim workplan for the property located at 13975 East Highway 88 in Lockeford, California (the site) A limited vapor extraction test will be performed on the piping installed beneath the underground storage tanks, and an "extended purge" will be performed on MW-2 The location of the site is illustrated on Figure 1 A plan of the site is illustrated on Figure 2 2 0 BACKGROUND 2.1 Site Description The property is located in Lockeford, California, a small rural community in northern San IJoaquin County The site is located on the northwest corner of the intersection of State Highway 88 and Cherry Street (Figure 1), and currently operates as Lockeford Beacon, a gasoline station A single building, canopy and txo filling islands currently occupy the property Four underground storage tanks (USTs) are located on the northern portion of the property (Figure 2) IAccording to an assessment report by Applied GeoSystems (AGS) of Sacramento, two dry wells (French drains) were located on the property until July 1987 These wells provided drainage for run-off and wash-down from the product dispenser area 22 Monitoring Well Installation Four 2-inch diameter groundwater monitoring wells (MW-1 through MW-4) were installed in June of 1987 to investigate soil and groundwater integrity at the site The wells were installed by AGS Petroleum hydrocarbons were detected in soil samples from MW-1, MW-2 and MW-3, and in groundwater samples from all four monitoring wells No floating product was discovered in any of the wells L—W-.d B.--."Z9%jM0.9 I