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• t l Preliminary Investigation and Evaluation Report 4032 North El Dorado Street Stockton, California rr `r 1.0. INTRODUCTION L0 At the request of Mr. Bob Eustis, Advanced GeoEnvironmental, Inc. has prepared the enclosed Preliminary Investigation and Evaluation Report (PIER) for 4032 North El Dorado Street, Stockton, California (the site). The scope of work included advancement of five soil probe borings and i„ collection and analysis of soil and ground water samples. The location of the site and its surroundings are illustrated on Figure 1 and major features on the site and soil probe boring locations are illustrated on Figure 2. rV. This investigation was performed in accordance with guidelines of the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND Lr In September 1998,one under ground storage tank(UST)was removed from the site by AGE. Based on field observations and analytical results of soil samples collected during the tank removal, the La PHS-EHD directed that a subsurface investigation be performed at the site to delineate the vertical and horizontal extent of petroleum hydrocarbon impacted soil. In accordance with PHS-EHD w. directives, procedures for a subsurface investigation were presented in the AGE-prepared Preliminary Site Assessment Work Plan, dated 28 February 2000. Additionally,one soil probe boring was advanced for to assess for an unauthorized release from three former fuel USTs by procedures outlined in the AGE-prepared Environmental Site Assessment Work Plan, dated 12 March 2000. a. 2.I. SITE LOCATION AND DESCRIPTION The site is located in a commercial area of very low topographic relief, sloping gently toward the west, as depicted on Figure 1, at an estimated elevation of 15 feet above sea level. The major portion of the site consists of a paved area used as a parking lot for auto (Figure 2). A single story office/garage is presently located on the site. Lr 2.2. UNDERGROUND STORAGE TANK REMOVAL On 25 September 1998 a UST was removed from the site. A vent line was also removed and back filled with grout under inspection by the PHS-EHD. Following removal of the tank, a backhoe was Advanced GcoEnvironmental.Inc.