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1.0 Introduction <br /> This report presents the results of the soil investigat on conducted by Shaw Environmental, Inc. <br /> (Shaw), formerly IT Corporation, at the Tracy Maintenance Station located at 2005 Krohn Road <br /> in Tracy, San Joaquin County, California (Figure 1). The Tracy Maintenance Station is operated <br /> by the California Department of Transportation (Caltrans). The investigation was conducted in <br /> March 2003. This investigation was conducted at the request and authorization of Mr. Saiyed <br /> Ali of Caltrans under Task Order No.10-987901-MT. <br /> ' 1.1 Background <br /> g d <br /> The Tracy Maintenance Station is owned by Caltrar s and is utilized primarily as an equipment <br /> -` repair facility. The facility is located off Highway 2C5 at 2005 Krohn Road in Tracy, California. <br /> An Initial Site Assessment (ISA) was completed f r the Tracy Maintenance Station (Geocon, <br /> 2001). This ISA reported that in 1970, a 5,600-liter (1,500-gallon) concrete septic tank and leach <br /> field located west of the wash rack was installed. T e wash rack discharged into the septic tank <br /> ' and leach field until 1999. In July 1999, the septic tank and leach field were,abandoned. A new <br /> mud rinse concrete slab, oil/water separator and clarifier, and extension of the city sewer line <br /> were subsequently installed. The septic tank and leh field piping were'rep-ortedl cleaned ands � <br /> Qremoved for disposal. The excavation was reportedly backfilled with rock from the leach field. <br /> The restrooms were disconnected from the septics stem in the early 1990s when remodeling s <br /> activities were performed for the office and equipment building. <br /> Thea applicable Caltrans modification drawings GP-2 gs G 2 and SS-3 are found in Appendix A. These <br /> show the area of work to include the abandonment Df the septic tank. Appendix B includes a <br /> copy of the City of Tracy demolition permit to abandon the concrete tank. Also included is the <br /> inspection record approved by a City of Tracy inspector. <br /> 1.2 Objective <br /> Ff The objective of this scope of work was to evalu to the presence or absence of hazardous <br /> concentrations of contaminants in soil in the vicinity of the leachfield. This investigation was <br /> figg" conducted in order to obtain_closufe of the leachfield rom the SJCEHD. 1 <br /> i. . <br /> t <br /> N:1sacDPI20031Pgl631835444.3ac.doc 1-1 <br />