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EL RANCHO ROCK & SAND, INC. QUARRY MVESTIGATION REPORT SLAB-1 SITE _ PAGE 1 1.0 INTRODUCTION The El Rancho Rock & Sand, Inc. Quarry, a small sand and gravel processing facility at 8020 Waverly Road in Linden, began operations some time prior to 1981 as "Linden Aggregates" and/or "Linden Sand and Gravel". In 1981, the property was issued Use Permit EP-81-9 for a 67.1 acre quarry site. In 1991, El Rancho Rock & Sand, Inc. (El Rancho) was issued. CUP QX-91-6 for an expanded quarrying operation which encompassed the entire 480-acre site. Processing operations at the plant ceased in September of 1993, before the permitted resources were completely quarried. The plant processing equipment was dismantled and removed from the site in December of 1993. The operation is now unofficially classified as "idle", or "inactive", and the approved Reclamation Plan is being implemented by Condor 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. The Reclamation Work Plan (Reclamation Plan) titled "Winter Stabilization Plan, Phase I of Reclamation", was submitted to the San Joaquin County Community Development Department, Development Services Division for their review and approval on March 3, 1994. Following discussions with Mr. Tom Gau, Senior Civil Engineer, the revised Reclamation Plan was submitted on March 10, 1994. The Phase I work was started on April 11, 1994. Implementation of the approved Reclamation Plan 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. In accordance with the Work Plan, this Investigation Report has been prepared to characterize the potential soil contamination that was encountered in the area designated as "Slab-1". As designated in the Work Plan, this potential contamination is classified as "Type 1 Contamination". 2.0 STATEMENT OF THE PROBLEM — On the morning of April 14, 1994, an area of potential soil contamination (see Figures 3 & 4) was encountered while performing site grading. The potential contamination was first identified by the equipment operator who noticed an unusual odor. Grading in this area was immediately — discontinued. The initial reconnaissance by Condor's site representatives confirmed that a localized area within a moist processed sand material adjacent to a buried concrete slab was 1 ;J CONDOR