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WORK PLAN ADDENDUM <br /> February 1996 <br /> Weldon Church, Inc. <br /> 104 West Beverly Place <br /> Tracy, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Weldon Church, Ach-anced GeoEnvironmental, Inc. (AGE) <br /> has prepared the enclosed Work Plan Addendum for the site at 104 West Beverly Place in Tracy, <br /> California (the site). The scope of work includes the installation of four ground water monitoring <br /> wells and backfilling of the excavation near the former UST area. The location of the site is <br /> illustrated on Figure 1 -Location Afap. A plan of the site is illustrated on Figure 2 -Site Plan. <br /> The work is performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank (UST) sites. <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION <br /> The site is located in a residential area of central Tracy, California, in San Joaquin County (Figure 1). <br /> One house and a detached garage/storage area are currently located on the property. An apartment <br /> complex is located immediately west of the former UST area; residences are located to the south and <br /> east of the site. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> One small capacity (less than 550-gallons)UST was installed at the site in the early 1980s. The tank <br /> was used to fuel vehicles associated with Church Refrigeration, a company owned and operated by <br /> Weldon Church. The tank was removed in early 1988. Ground water was encountered in the tank <br /> excavation during removal. Subsequently, one soil and one grab water sample were collected from <br /> the tank excavation in August 1988. <br /> Both samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br /> stoddard solvents, paint thinner, diesel, kerosene, motor oil and volatile aromatics (benzene, toluene, <br /> ethyl benzene and xylene: BTE&X). <br /> TPH-g, toluene and xylenes were detected in the soil sample at concentrations of 530, 21.0 and 79.2 <br /> parts per million (ppm), respectively. TPH-g , benzene, toluene and xylenes were detected in the <br /> water sample at concentrations of 117,000, 10,100, 11,300 and 9,330 parts per billion (ppb), <br />