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r 01- PRELIMINARY INVESTIGATION AND EVALUATION REPORT October 1996 Gemelos Property (Paladin Center) 2421 East Holly Drive Tracy, California I 10. INTRODUCTION AND SCOPE OF'WORK In accordance with the request of Mr John Gemelos Advanced GeoEnvironmental, Inc (AGE) has ' prepared the enclosed Preliminary Investigation and Evaluation Report(PIER) for the site located at 2421 East Holly Drive, Tracy, California (the site) The objective of the investigation was to detennine the lateral and vertical extent of hydrocarbon- impacted soil and ground water at the site The scope of work included the installation of one soil boring, three groundwater monitoring wells and the collection of groundwater samples The field work was pez formed on 11 July 1996 The location of the site is illustrated on Figure 1 - Location Map Structures, boring and monitoring well locations are shown on Figure 2 - Site Plan The work was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for investigation of underground storage tank (UST) sites ' 20. BACKGROUND 21 SITE LOCATION ' The site is located 3n a residential area of central Tracy, California, in San Joaquin County (Figure 1) One building used for auto repair is currently located on the property The building is ' immediately west of the former UST area Another auto repair business is located east of the site 2 2 UNDERGROUND STORAGE TANK REMOVAL Two 10,000-gallon underground storage tanks (USTs) were removed from the property in April ' 1988 Approximately 100 to 120 cubic yards of soil were removed during the excavation Upon removal of the USTs, soil and ground water samples were collected from the excavation areas ' Laboratory results from the samples indicated that hydrocarbon-impacted ground water was present at the site 1 .t 1