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CHRONOLOGY <br /> HOLT BROTHERS <br /> 1541 CHARTER WAY <br /> STOCKTON <br /> SITE CODE: 1988 <br /> 11/26/86 Precision tests performed on 8 USTs at site <br /> Tanks 7 and 8 failed the precision test <br /> 04/26/88- 8 USTs removed (tanks 1-3 at 1501 Charter) <br /> 04/27/88 Tank 4 (5,000 gallon Diesel Tank) <br /> Tank 6 (1,000 gallon Regular Tank) <br /> Tank 7 (1,000 gallon StM dard Solvent Tank) <br /> Tank 8 (3,000 gallon Bulk Oil Tank) <br /> Tank 9 (2,000 gallon 30 weight Oil Tank) <br /> Tank 10 (3,000 gallon Hydraulic Oil Tank) were all located in the <br /> same excavation. <br /> Tank 6 had a hole in it - <br /> There was odor at 12 feet-15 feet bgs under Tanks 6,7, and 9 <br /> Tank 5 (7,500 gallon Diesel Tank) and <br /> Tank 11 (3,000 gallon Waste Oil Tank) were located in separate <br /> areas <br /> Further investigation in area of Tank 5 is not warranted - No holes <br /> in the tank nor odor or discoloration of the soil were noted - DL 10 <br /> ppb BTX .5 ppm TPH-g <br /> 5 ppm TPH-d was detected <br /> Soil under Tank 11 was gray and odorous at 16 feet bgs <br /> 05/20/88- Received soil sample results <br /> 05/31/88 Highest contamination under Tank 6 <br /> Detection limit for BTEX raised to 2,000 ppb <br /> Toluene 4,900 ppb, Xylene 43,000 ppb, TPH-g 610 ppm, <br /> EDB 155 ppb <br /> Tank 4 low levels of contamination <br /> Tank 7 Benzene and Toluene ND at 1,000 ppb, Xylene 4130 ppb, <br /> TPH-g 130, Motor Oil 370 ppm <br /> Tank 9 Motor Oil 230 ppm Stoddard 46 ppm <br /> Tank 8 and 10 BTX ND at 10 ppb, TPH ND at 1 ppm <br /> Tank 11 B and T ND at 1,000 ppb, Xylene 1700 ppb, <br /> TPH-d 5,000 ppm, Motor Oil 6,000 ppm <br /> Methylene Chloride 350 ppb, Chlorobenzene 32.5 ppb <br /> 10/19/88 Letter from Bio-National stating excavation will be filled and <br /> compacted prior to coring for plume definition <br /> Backfilled with soil from removal (contaminated) <br /> 12/01/88 Work plan for 4 monitoring wells received <br /> w- ;'�t 1D� i��-i <br /> 1,1 <br />