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Site Assessment Report - March 1998 Burkhardt Property 5154 Hogan Lane, Lodi, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the request of Ms. Hilda Burkhardt,Advanced GeoEnvirorunental, Inc., (AGE) has prepared this Site Assessment Report(SAR)for the property located at 5154 Hogan Lane,Lodi, California. The objective of the work for this investigation was to assess the impact of petroleum hydrocarbons west of the former gasoline underground storage tank(UST)area at the site.The scope of work for this investigation included advancement of one continuous soil probe boring, collection of soil samples, collection of one domestic water well sample, performance of a well survey and preparation of this report.The location of the site is illustrated on Figure 1; the locations of structures and borings on the site are illustrated on Figure 2. The investigation was performed in accordance with the guidelines of both the San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality Control Board for the investigation of UST sites. 2.0. BACKGROUND 2.1. SITE LOCATION The site is located at 5154 Hogan Lane southeast of Lodi, in San Joaquin County, California, approximately 1/2 mile east of Highway 99 between Harney Lane and Armstrong Road. The site is located in the southwest quarter of Section 19,Township 3 North,Range 6 East,Mount Diablo Base & Meridian (Lodi South Quadrangle, 7.5-Minute USGS Topographic Series, 1968,photo revised 1976). Land use in the immediate vicinity of the site is rural residential/agricultural. 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that a gasoline UST was removed from the property in 1992. Soil samples collected from beneath the gasoline UST were submitted for laboratory analysis and detected substantial concentrations of petroleum hydrocarbons. As a result, over-excavation activities were performed in the former gasoline UST area in September 1995. Soil samples collected from the sidewalls and floor of the over excavation were submitted for laboratory analysis and detected substantial concentrations of total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile aromatics (toluene, ethyl benzene and xylenes). Analytical results fi•om over-excavation confirmation samples are summarized in Table 1. `„ Advanced GeoEnwonmental,Inc.