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EL RANCHO ROCK & SAND, INC. QUARRY INVESTIGATION REPORT #2 SURFACE STAINS & SPILLS _ PAGE I 1.0 INTRODUCTION The El Rancho Rock & Sand, Inc. (El Rancho) Quarry is a small sand and gravel processing facility located at 8020 Waverly Road in Linden. Processing operations at the plant ceased in September of 1993, and the plant processing equipment was dismantled and removed from the site in December of 1993. The approved Reclamation Plan is being implemented by Condor Earth Technologies, Inc. (Condor), on behalf of El Rancho, under the direction of the San Joaquin County Community Development Department. The site location is illustrated as Figure 1, Location Map. Figure 2, Site Plan, summarizes the site features relevant to the reclamation operation currently in progress. Implementation of the approved Reclamation Work Plan (Reclamation Plan) started on April 11, 1994 and includes earthmoving, grading, and recontouring activities, as well as the demolishing and removal of mass and reinforced concrete. It had been anticipated that areas of potential contamination may be encountered in the near-surface and subsurface soil materials beneath or near the plant facility as well as in other areas of the site. A Work Plan, dated April 22, 1994, was submitted to the San Joaquin County Department of Environmental Health (SJCDEH) that describes the procedures for addressing the potential contamination. Additional site background information is included in the Work Plan and in Investigation Report #1. In accordance with the Work Plan, this Investigation Report (Report #2) has been prepared to address the visible surface stained soil and known spills present in numerous isolated areas — around the site. Areas previously identified by San Joaquin County as apparent contamination adjacent to "concrete pads" are included. As designated in the Work Plan, this potential contamination is classified as "Type 2 and Type 3 Contamination". The locations of various --• containers of apparent hazardous materials are also identified. 2.0 STATEMENT OF THE PROBLEM There are potentially contaminated soils at the facility, in work areas which predate the recent plant facility operations. A scrap yard, or "bone yard" of abandoned equipment was present _ near the eastern edge of the property. Some equipment in this area dates from the old "Linden Aggregates" operation. Operators of the El Rancho Rock & Sand, Inc. quarry stated to Condor in 1991 that they were told to leave this equipment alone years ago, as it was part of a bankruptcy proceeding relating to the Linden Aggregates operation. The land owner, Ross Purviance, has subsequently salvaged much of the equipment and material that was present in the bone yard. Several fuel and other tanks remain in the bone yard, as well as cans and drums that contain oily materials. Many of these tanks, as well as the oily materials, appear to have originated from the salvaged equipment. Dark spotting on the ground surface in these areas appears to be indicative of old oil and diesel fuel spills. These areas have been mapped and photographed, and the locations of these areas are shown in Figure 4. n _ L� CONDOR