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REPORT MONITOR WELL INSTALLATION AND SAMPLING I i " New Jerusalem School w 31400 Koster Road Tracy, California Prepared by: Condor Earth Technologies, Inc. January 29, 1999 1. INTRODUCTION On December 21, 1998, Condor Earth Technologies, Inc. (Condor) supervised the installation of three monitor wells at the New Jerusalem School located at 31400 Koster Road in Tracy, California(Figure 1, Appendix A). The purpose of the work was to further investigate the horizontal and vertical extent of gasoline contamination at the site. This report was prepared at the request Mr. Dennis Boyer, Superintendent of the New Jerusalem School District. The work described in this report was conducted in general accordance with the WORKPLAN, SOIL AND GROUNDWATER INVESTIGATION WATER WELL INVENTORY, prepared by Condor and dated October 21 and 26, 1998. Ms. Carol Oz of the San Joaquin .County Public Health Services Environmental Health Division (PHS/EHD) approved the Work Plan with modifications by way of a faxed transmission dated November 19, 1998. This report includes_a site background, a description of the Meld and analytical methods used to conduct the work, a description of the field and analytical results of the investigation, and conclusions/recommendations. _ 2. SITE BACKGROUND f ` A Preliminary Investigation and Evaluation Report (PIER) dated February 27, 1997, was prepared by Advanced GeoEnvironmental, Inc (AGE). The fieldwork was conducted by AGE on November 18, 1996. The PIER indicated that a 1,000-gallon UST and a 350-gallon UST were removed from the site in. July, 1989 and that analyses of soil samples collected from beneath the 350-gallon UST detected the presence of gasoline contamination. According to the PIER, the field investigation included the installation and sampling of three soil borings and the results indicated that gasoline and gasoline constituents were present in the soil and groundwater at the site. The PIER also reported that groundwater was encountered at approximately 12 feet below the ground surface (bgs) and that the C regional groundwater flow was toward the northeast. Ms. Oz of the PHS/EHD subsequently directed the New Jerusalem School to submit a work plan to conduct additional investigative activities at the site including sampling and laboratory analyses of the on-site domestic well water and irrigation well water, and conducting a groundwater receptor survey } within a 2,000-foot radius of the site. i y tJ { � CONDOR