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-..r. 7.t lY.��' a 'i'i lei er n`„ _ .. - .. ......... i..:- -.,+ .r ".._T;....I. ,,,. . / -,.,_...., :✓.- :, .N.r,✓., x.tt f Y�1 .l.. yN� :,e .,J'k� '.� i r� '.I `.tI 'i..�i.h. kl4 f'.,, +.r.r..Y'r.t„ I .,._....,...._ L.a...w,....�.tn;tLY,.L,✓.v�Io�.....,.�.._�. �i..:.:w,.�.'' ''.,vc:.r:�. - �. � -' i rie�iS"ir tet{�h. i. i4 x; SECTION 1. INTRODUCTION This document is an interim Preliminary Assessment Report (PAR) for property located at the western extreme of West Weber Avenue, Stccl;ton, California (Figure 1-1). This report is being submitted to the Environmental Health Division (EYID) of San Joaquin County Public Health Services by LRM-West, Inc. (ERM-West) on behalf of Catellus Development Corporation (Catellus). The report has been prepared in accordance with regulators guidelines, specifically the Tri-Regional I3oard Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites, dated 10 August 1990. The purpose of th;s report is to summarize the site characterization and investigation activities to date for three tank removals. A preliminary evaluation of remedial alternatives is also presented for two of the three tank site locations where leaks have occurred. This report describes three locations of the West Weber property, specifically at the addresses 1515, 1325, and 1541 (Figure 1-2). Underground storage tanks have been removed from each location. At 1515 and 1325 West Weber, a release of petroleum products from 1 the tanks has been detected. The extent of the release from the 1515 West Weber location has been characterized. The extent of the release from the property located at 1325 West Weber, however, has not been characterized and will require further investigation. Leaks were not evident from the tank removed from the 1541 West Weber location. Sample results indicated that constituents were not detected in either soil or ground water beneath the former tank. The original supporting laboratory reports have previously been submitted to the County; copies have also been included in this PAR as an appendix. These laboratory reports confirm that the tank removal at 1541 West Weber was a clean closure. Because no further action is necessary at 1541 West Weber, this PAR focuses e- . the other two addresses (1515 and 1325 West Weber) where tank lea...; occurred. Analytical data have been summarized in this PAR,, and original laboratory reports have been included in an appendix. Following this introduction, the Problem Assessment Report provides historical and background information for the three former tank sites. The report presents the findings from past work at 1515 1-1 o.