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Preliminary Site Assessment Work Plan - May 1998 Rail Road Square (former Sears Roebuck) North Aurora Street, Stockton, California APN# 151-08-46 620 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr. Rod Bovee of the Union Safe Deposit Bank (USDB) Advanced GeoEnvironmental, Inc. (AGE)has prepared the enclosed Preliminary Site Assessment Work Plan for the Rail Road Square(former Sears Roebuck)at 620 North Aurora Street, Stockton, California. The scope of work is to advance six (6) soil probe borings, utilizing direct push technology (DPT). The objective is to investigate if an unauthorized release of petroleum hydrocarbons related to the former use of underground storage tank(s) (USTs) at the site. The location of the site is illustrated in Figure 1 -Location Map. A plan of the site is depicted in Figure 2 -Site Plan. This work plan is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality Control Board guidelines for the investigation of UST sites. 2.0. BACKGROUND 2.1. SITE LOCATION The site is located on the east side of North Aurora Street, south of Park Street in a commercial/industrial area of low topographic relief in Stockton at an elevation between 15 and 20 feet above mean sea level. Residential property lies further toward the west. The regional slope of the area is toward the west. The surface of the site is covered mostly with asphalt. 2.3. REGIONAL GROUND WATER ELEVATION The estimated depth to ground water at the property is approximately 50 feet below surface grade (bsg),based on the map titled Lines of Equal Depth to Groundwater Spring 1996 published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD). The map titled Lines of Equal Elevation of Groundwater Spring 1996, also published by the FCD&WCD, shows the property to be near an area of depressed ground water elevation,where ground water from the surrounding area flows toward the low. The map is suggestive of local ground water flow toward the east to northeast on or near the property, but this may be easily modified by changing recharge and discharge patterns. Ground water is considered to be of beneficial use and is used for domestic, industrial and commercial purposes. Advanced GeoEnviron mental,Inc.