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.�� PRELIMINARY INVESTIGATION AND EVALUATION REPORT August 1996 ' Shockey and Sons Trucking 850 Milgeo Avenue ' Ripon, California 1110. INTRODUCTION In accordance with the request of Mr. Lee Shockey,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Preliminary Investigation and Evaluation Report(PIER) for the site located at 850 Milgeo Avenue; Ripon, California (the site). The scope of work included the advancement of five soil probe borings and the installation and sampling of four ground water monitoring wells. ' The location of the site is depicted in Figure 1-Location Map. A plan of the site is included in Figure 2 -Site Plan. ' Monitoring and sampling procedures were performed in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and ' the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites. 2.0. BACKGROUND 2.1. SITE LOCATION The site is located adjacent to State Highway 99 along the south side of Milgeo Avenue at the ' intersection Wilma Road. The property is zoned industrial and is presently utilized as a distribution warehouse and trucking operation. Land use in the immediate vicinity of the site.is agricultural and industrial. A residential area is located north of the site. 2.2. UNDERGROUND STORAGE TANK REMOVAL tt is our understanding that six USTs were removed in April 1994 from three separate excavations on the property: one waste oil UST; one diesel UST; and four unleaded gasoline USTs. Petroleum hydrocarbons were detected in soil samples collected from beneath the USTs during removal. Soil excavated during the UST removals was used to backfill each excavation. Clean soil was imported --. 'to "cap"each excavation. ' 2.3. GROUND WATER DEPTH AND FLOW DIRECTION In December 1995, ground water depth at the site was approximately 19 feet below surface grade r.