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Chronology <br /> Colberg�Boatwork ... <br /> 848 Fremont, Stockton <br /> Page 3 <br /> all non-detect in gas, aromatic.HC, and MTBE except SB-21 at 20 feet which <br /> were 0.030 mg/kg of MTBE. Results of SB-21 and SB-22 grab groundwater <br /> samples were 230 pg/l and 2.9 pg/l of MTBE, respectively,using EPA <br /> Method 8020. The report also included the results of the monitoring dell <br /> groundwater samples. Results.of MW-3 were 48 pg/1 of MTBE by EPA <br /> Method 8020. Analyses by Method 8260 were not performed. <br /> 02/20/01 Date of EHD letter that requested a work plan for additional investigation to <br /> delineate MTBE. <br /> 01/28/02 Additional 6 Geoprobe soil borings SB-25 through SB-30 were advanced on <br /> site to collect soil and grab groundwater samples to delineate the extent of <br /> the MTBE contamination in the area of the former gas tank. <br /> 06/26/02 EHD received "No Further Action Request" report prepared by GHH <br /> Engineering (GHH). The report includes the results of the 6 geoprobe <br /> borings grab groundwater samples which were non-detect or in low <br /> concentrations. Method 8260 was used to analyze for oxygenates. Ii <br /> gas Benzene Toluene Ethyl Xylenes MTBE 1 <br /> benzene <br /> SB-25 56 ND 0.67 1.1 2.04 ND <br /> SB-26 68 1.2 0.89 0.54 ND 0.72 <br /> SB-27 ND ND ND 0.73 ND ND <br /> SB-28 ND ND ND ND ND 1.8 <br /> Results in pg/1. Oxygenates by Method 8260B <br /> The well survey (Page A-7) included in the report indicated only one well <br /> I <br /> within half a mile located on the south side of the Stockton Deep Water <br /> Channel. One public water well was indicated on the map but it is located <br /> outside of the half-mile radius. <br /> R <br /> .I <br />