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1f � <br /> ,A <br /> CHRONOLOGY <br /> 1250 N WILSON WAY <br /> STOCKTON <br /> SITE CODE: 1299 <br /> 1987 p <br /> 12/87 Sampling results of four exploratory borings to <br /> depths of 20 feet bgs indicate" soil contamination <br /> around the UGST's. Work proposed as part of a <br /> property lease contract betweern Thrifty Oil and <br /> Circle K Inc. UST's still, in ,use. <br />� Fi <br /> 1988 <br /> 05/12/88 Contaminated MFR, UAR, and Prop'. 65 filed this date. <br /> Site placed on the contaminated site list. <br /> ,I <br /> 1989 II <br /> 4 <br /> 02/08/89 Received review of 1986, 1587, ;and 1988 precision <br /> test on UGST's. All tanks tested tight. <br /> a - <br /> 08/26/89 3 monitoring wells constructed on site. Soil <br /> contamination encountered in borings MW-1 and MW-2 <br /> while no soil contamination encountered in boring <br /> MW-3 . Water analysis, revealed!contamination in MW- <br /> 1 and MW-2 (drilling to 60 feet;) while MW-3 was dry. <br />` - - - - <br /> Gradient-could- not be established. <br /> 09/08/89 Placed in pilot program. 4� <br /> 1992 �I <br /> 07/23/92 Received workplan for 7 exploratory borings. Three <br /> to be converted to monitoring wells and four to be <br /> used as possible vapor extractlon wells in the s <br /> future. MW-3 proposed tobe abandoned. <br /> 09/14/92 Bankruptcy filed by Thrifty Oil Co. <br /> 11/18/92 Soil borings and vapor extract'lon wells completed <br /> this day i <br /> 1993 'I <br /> 02/08/93 Received and reviewed site assessment report. Soil <br /> and groundwater contamination -have not been <br /> completely defined. ;' <br /> 07/25/93 Comment letter mailed requesting further work to <br /> define the extent of contamination in the soil and <br />