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SITE CONTAMINATION WORK PLAN Weldon Church, Inc. 104 West Beverly Place Tracy, California February 1995 1.0 INTRODUCTION In accordance with the request of Mr. Weldon Church, property owner, Geological Audit Services, Inc. (GeoAudit) has prepared this Site Contamination Work Plan for excavation of the former underground storage tank (UST) are and the drilling and installation of three groundwater monitoring wells at 104 West Beverly Place in Tracy, California (the site). The site location is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. 2.0 BACKGROUND 2.1 Site Location The site is located in a residential area of central Tracy, California, in San Joaquin County (Figure 1). One house and a detached garage/storage area are currently located on the property. An apartment complex is located immediately west of the site; residences are located to the south and east of the site. 2.2 Underground Storage Tank Removal It is our understanding that one small capacity (less than 550-gallons) UST was installed at the site in the early 1980's. The tank was used to fuel vehicles associated with Church Refrigeration, a company owned and operated by Weldon Church. The tank was removed in early 1988. Groundwater was encountered in the tank excavation and one soil and one water sample were collected in August 1988. Both samples were analyzed for total petroleum hydrocarbons (TPH) as gasoline, Stoddard solvent, paint thinner, diesel, kerosene and motor oil as well as benzene, toluene and xylenes (BTX). TPH as gasoline, toluene and xylenes were detected in the soil sample at concentrations of 530 ppm (parts per million), 21,000 ppb (parts per billion) and 79,204 ppb, respectively. TPH as gasoline, benzene, toluene and xylenes were detected in the water sample at concentrations of 117,000 ppb, 10,100 ppb, 11,300 ppb and 9,330 ppb, respectively. 0-66.1 A..W S-si I... SC.9S-01-1065.02/W61DON CHURCH wPW 1