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rar • SITE BACKGROUND INFORMATION ECKERT COLD STORAGE Manteca, California In July 1986, a 500-gallon capacity underground storage tank (UST), identified as TK4, was removed from the site Laboratory analyses of soil samples collected from the UST removal area in April 1987 indicated the soil was impacted with petroleum hydrocarbons In February 1988, three remaining USTs were removed from the vicinity of the former location of TK4 Laboratory analyses of soil samples collected during removal of the three remaining USTs did not identify petroleum impacted soils As a result of the soil contamination identified in April of 1987, the San Joaquin County Public Health Department/Environmental Health Division (SJCPHD/EHD) directed Eckert Cold Storage to conduct a site investigation and submit a Problem Assessment Report In response to the directive from the SJCPHD/EHD, WHF, Inc (WHF)installed three monitoring wells identified as MW-1, MW-2, and MW- 3 in January 1995 During initial development of the wells, it was discovered that the well casing of MW- 2 had been damaged during installation of the well, such that bailers and pumps could not be placed down the well Because petroleum hydrocarbon contamination was noted in all three borings drilled for MW-1 through MW-3, WHF elected to use MW-2 for groundwater gradient data collection and install an additional well in the down-gradient direction Consequently, an additional well (MW-4) was installed at the site on March 22, 1995 On September 18 and 19, 1997, three additional monitoring wells identified as MW-5, MW-6, and MW-7 were installed at the site A sensitive receptor survey for the site was conducted by WHF in 1998 On November 2 and 3, 1999, WHF advanced four shallow soil borings to depths ranging from 38 to 41 5 feet below ground surface (bgs) Groundwater was reportedly encountered at approximately 23 feet bgs One of the shallow borings was completed as an additional monitoring well (MW-8) Additionally, a deep boring was advanced to a depth of 56 5 feet bgs to evaluate the vertical extent of contamination in the location of the former UST area Petroleum hydrocarbon constituents were detected in all of the soil samples collected from the deep boring WHF conducted quarterly groundwater monitoring activities at the site from April 1995 to December 2001 Condor conducted quarterly groundwater monitoring activities at the site on February 27, 2002, and prepared the First Quarter 2002 Groundwater Monitoring Report, dated April 26, 2002, describing the results of work On April 8, 2002, Condor re-surveyed the monitoring wells at the site in accordance with CRWQCB directives regarding Electronic Deliverable Format (EDF) for UST sites The new EDF monitoring well data was used in the First Quarter 2002 Groundwater Monitoring Report I Condor conducted the second quarter 2002 groundwater monitoring event at the site on June 26, 2002 Groundwater samples were collected and submitted for laboratory analyses from monitoring wells, MW- 1, MW-3, MW4, MW-5, MW-6, MW-7, MW-8, and domestic well DW-1 No sheen or separate phase petroleum was noted in the groundwater recovered from the wells, however, a strong petroleum odor was noted in MW-1 and moderate petroleum odors were noted in monitoring wells MW-3 and MW-8 The groundwater samples collected from the monitoring wells and the domestic well were analyzed for BTEX, THP-G, and selected gasoline oxygenates/additives including MTBE by Excelchem Laboratories, Inc of Roseville, Cahfomia Laboratory analytical results for the June 26, 2002, monitoring event were generally consistent with historical laboratory analytical results i