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v <br /> i <br /> Chronology <br /> 913 Fremont, Stockton <br /> Page 2 <br /> 05/07/96 MW-4 (4 inch casing) was installed in the downgradient <br /> direction. The screen was set from 5 feet to 25 feet bsg_ <br /> Analytical results of groundwater samples -and soil samples <br /> at 5, 10 and 17 feet bsg were non-detect for TPH-g. <br /> 03/25/99 A 3.5 inch in diameter, 10 feet length of Oxygen Release <br /> Compound (ORC) was installed in MW-2 until September 1999. <br /> 09/03/99 Installed MW-5 at a distance of 7 feet from the currently <br /> drowned MW-2 . MW-5 was screened from 5 to 20 feet bsg. <br /> Analytical results of soil samples at 15 feet bsg were 1,300 <br /> mg/kg of TPH-g, but non-detect at 0.10 mg/kg at 20 feet bsg., <br /> 06/02/00 JJW Geosciences, Inc. (JJW) calculated 0.15 kilograms of <br /> gasoline left remaining in groundwater, and 19 kilograms of 5 <br /> gasoline left remaining in the soil. <br /> 07/15/02 A descriptive sensitive receptor survey was completed by <br /> JJW. Based on declining groundwater concentration, lack of <br /> local receptors, and limited mass remaining in soil and <br /> groundwater, JJW submitted site closure request on the <br /> behalf of the RP. <br /> Table 1. selected analytical results of monitoring well groundwater <br /> samples of TPH-g in micrograms per liter (µg/l) <br /> DTW(bsg) MW-1 MW-2 MW-3 MW-4 MW-5 <br /> screen 15-30 15-30 15-30 5-25 5-20 <br /> 03/94 - 13' nd 96, 800 nd ---- --- <br /> 03/97 -- 8' nd 2,480 52 nd ---- <br /> 09/99 -- 9' nd 1,200 nd nd 2,500 <br /> 12/00 - 10' nd 1, 100 nd nd 55 <br /> 11/01 - 10' nd 130 nd nd nd <br /> 05/02 - 9' nd nd nd nd nd <br /> 09/30/02 Completed Chronology and Closure Form <br /> i <br /> 4 <br /> �I <br /> h <br />