SITE INFORMATION AND CORRESPONDENCE

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T ENMON`M,EN T AL. HEALTh PFRPET TVICE 94 DEC -5 PM 2: 04 PILOT TESTING REPORT AND CONCEPTUAL CORRECTIVE ACTION PLAN MANNA PRO CORPORATION FACILITY 4004 EL DORADO STREET STOCKTON, CALIFORNIA EXECUTIVE SUMMARY This Executive Summary summarizes pertinent findings and conclusions of the Pilot Testing Report and Conceptual Corrective ActiOn Plan, Manna Pro Corporation Facility, 4004 El Dorado Street, Stockton, California, dated July 15, 1994 (the "Report"). This Executive Summary was prepared at the request of San Joaquin County Public Health Services (SJCPHS) and only summarizes some of the findings and conclusions set forth in the Report. It does not, nor is it intended to, describe the factual and scientific basis for the findings and conclusions set forth, nor does it describe past work performed at the site, or the geological, hydrological or other characteristics of the site, where such matters have been described in other reports. ANY PARTIES INTERESTED IN THE SITE REMEDIATION ARE CAUTIONED TO REVIEW THE REPORT IN FULL FOR ALL PARTICULARS ABOUT THE SITE CONDITIONS, PILOT TESTING WORK, AND RECOMMENDED REMEDIATION TECHNOLOGIES. The objective of the work performed by Groundwater Technology, Inc., and described in the Report (the "Pilot Testing Work") was to further quantify groundwater and soil vapor flow characteristics under various vacuum and pumping Influences to determine a cost effective remedial action technology appropriate for removal of gasoline and diesel fuel hydrocarbons detected in the soil and groundwater at the site. The Pilot Testing Work had essentially four components: i) Installing one extraction well and three observation wells for the purposes of conducting the pilot testing described below; ii) performing a constant-rate aquifer test (which involved groundwater pumping only); iii) performing a combined groundwater extraction and high-vacuum soil vapor extraction (HVE) test (which involved pumping groundwater from the extraction well using a centrifugal pump and applying a vacuum to the well to extract soil vapors and enhance groundwater flow from the well); and iv) performing a high-vacuum dual-phase extraction (HVDPE) test (which involved applying a vacuum to the well to extract both soil vapors and groundwater from the well). GROUNlYWATER TECHNOLOGY,INC.