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s SITE ASSESSMENT REPORT 375 W. HAZELTON AVENUE STOCKTON, CALIFORNIA 1.0 INTRODUCTION This report summarizes the results of the site assessment activities conducted by ALTA EM, INC. (AEM) at the subject site in Stockton, California (see attached Site LocationlMap-Figure 1). 2.0 OBJECTIVE AND SCOPE OF WORK The objective of the investigation was to assess the subsurface soil and shallow groundwater for petroleum fuel hydrocarbons in selected areas of greatest potential concern. The scope of the assessment activities included the following major tasks: Advancement of eight direct-push soil borings to approximately 20 to 25 feet deep, and the collection of soil samples at approximate five-foot depth intervals; 0 Collection of in-situ groundwater samples at each boring;location; * Analyses of selected soil samples, and all groundwater samples, for the presence of TPH (C4-C25), BTEX and MTBE. In addition, selected soil samples, and all groundwater samples, were analyzed for other fuel oxygenates; and Analyses of the data, and preparation of the following report. 3.0 SITE SETTING 3.1 Site Surface Conditions The site is entirely occupied by Sierra Lumber, a wood milling an&1fabrication operation which cuts and assembles parts used by others for the assembly of doors, windows and other wood products. The property is located in an area occupied predominantly by industrial and some scattered residential development. The approximate elevation of the subject site is 10 feet above mean sea level. The general layout of the site is shown on attached Figure 2. 3.2 Physiographic Setting The site is located in central San Joaquin County, in the central portion of the City of Stockton. The Mormon Slough (waterway) is located adjacent to the northeast of the site,while a connecting larger body of water known as the Stockton Port is more than 0.5 miles west and northwest of the site. The immediate site vicinity is characterized by flat topography with a'y a slight predominant slope toward the northeast. The average annual precipitation rate in the region is approximately 14 inches (NOAH, 1992). 3.3 Nearby Wells i Hydrogeology The site is underlain by shallow groundwater at approximately 21 feet deep. This groundwater is reported to have been as deep as approximately 30 feet in 1994. Groundwater in this shallow zone is believed to exist under unconfined conditions, and is reported to generally flow southwest (AGE, 2003). Proi. No.: 04483-01 1 of 7 AEM