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PROBLEM ASSESSMENT REPORT LEckert Cold Storage 757 Moffat Boulevard Manteca, California November 25, 2002 1 1.0 INTRODUCTION Condor Earth Technologies, Inc. (Condor) prepared this Problem Assessment Report (PAR) at the request of Mr. Pete Thompson, president of Eckert Cold Storage Co (Eckert) to summarize the investigation of the release of petroleum hydrocarbons to soil and groundwater at the Eckert Cold Storage facility (site) located at 757 Moffat Boulevard, Manteca, California (Figures 1 and 2, Appendix A). Condor conducted additional groundwater investigation at the site in response to San Joaquin County Public Health Services, Environmental Health Department (SJCEHD) requirements to adequately investigate the lateral and vertical extent of groundwater contamination at the site prior to consideration of site closure. The work was performed in accordance with the Problem Assessment Work Plan — Additional Groundwater Investigation, dated May 31, 2002, prepared by Condor and approved by Mr. Harlin Knoll, Senior Registered Environmental Health Specialist with the SJCEHD in a facsimile dated September 26, 2002. The field portion of the investigation described in this report was conducted on � . October 10 and 11, 2002. A summary of the sampling and analyses of soil and groundwater samples associated with investigation of the site of the former underground storage tanks (USTs) is presented in this report. ' Hydrocarbon contamination at the site was associated with a leaking underground storage tank (UST) that was removed in July 1986. WHF Environmental (WHF) conducted soil and groundwater 1 investigation and groundwater monitoring on-site from 1995 through 2001. Condor began on-site groundwater monitoring activities in February 2002. All work conducted by Condor was under the supervision of a California State Registered Geologist. This report includes a site description, site background, field and analytical methods, field observations, laboratory analytical results of the 1 investigation, review of the WHF groundwater receptor survey, discussion of the investigation results, description of corrective action strategies, comparison of remediation techniques, and a summary statement. 2.0 SITE DESCRIPTION The Eckert Cold Storage facility is located in an urbanized area in Manteca. The site occupies approximately ten acres of property and is utilized for the purpose of processing vegetables and the cold storage of the processed product. The business area is paved with either concrete or asphalt. A location 1 and site map of the facility are presented in Figures 1 and 2, respectively. The site map (Figure 2) shows the locations of the monitor wells and soil borings installed by WHF in previous phases of investigation and the direct push borings (HP and CPT- Hydropunch and Cone Penetrometer,respectively) installed by Condor during the current phase of investigation. 1 %s CONDOR