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CHRONOLOGY <br /> Former Morita Brothers <br /> 814 E. Charter Way, Stockton, CA 95206 <br /> San Joaquin County Local Oversight Program <br /> GeoTracker ID#T0607700542 LOP Site # 1061 <br /> Clean Up Fund Claim #6793 CVRWQCB# 390703 <br /> 12/27/1991 Four underground storage tanks (USTs) were excavated and removed from the <br /> site under San Joaquin County Environmental Health Department (EHD) <br /> inspection on this date. The removed USTs included one 5,000-gallon regular <br /> gasoline, one 5,000-gallon unleaded regular gasoline, one 2,000-gallon super <br /> unleaded gasoline and one 500-gallon waste oil UST. Stained, odoriferous soil <br /> associated with the UST pit was noted. <br /> 12/31/1991 Date the stockpiled soil was placed back into excavation. <br /> 02/11/1992 The EHD received Tank Closure Report, dated 23 January 1991; prepared by <br /> Earth Systems Environmental, Inc. (ESE); which documented reportable <br /> concentrations of total petroleum hydrocarbons quantified as gasoline (TPHg), <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX) in soil samples collected <br /> from the UST excavation and spoil piles. Impacted tank pit soil samples contained <br /> as much as 2,250 milligrams per kilogram (mg/Kg) TPHg, 5,905 micrograms per <br /> kilogram (pg/Kg) benzene, 14,330 pg/Kg toluene, 1,215 pg/Kg ethylbenzene and <br /> 44,935 pg/Kg total xylenes. <br /> 02/18/1992 An Unauthorized Release Report and a Notification of Hazardous Waste <br /> Discharge was filed on this date. <br /> 03/25/1992 Soil borings TH-1 through TH-7 were advanced on site to delineate impacted soil <br /> 03/26/1992 on these dates. Soil at 30 and 35 feet below surface grade (bsg) was universally <br /> impacted; the most impacted soil apparently near TH-4, immediately west of the <br /> former UST pit. Impacted soil contained as much as 5.85 mg/Kg TPHg, 1,000 <br /> pg/Kg benzene, 1,300 pg/Kg toluene, 160 pg/Kg ethylbenzene and 860 pg/Kg total <br /> xylenes (TH-4 at 30 feet bsg). Data provided technical justification for groundwater <br /> investigation. <br /> 04/02/1992 Date a Notice of Reimbursement and a letter notifying the responsible party that <br /> the site was placed in the Local Oversight Program was sent. <br /> 05/11/1992 Date the EHD received Preliminary Site Characterization Report dated 05/06/1992 <br /> that discussed the March 1992 work. <br /> 05/29/1992 Date of the EHD letter concurring with the Preliminary Site Characterization Report <br /> on excavation of impacted soil and requesting submittal of a work plan for the <br /> remediation and installation of groundwater monitoring wells. <br /> 09/29/1992 Dates that monitoring wells MW-1, MW-2 and MW-3 were installed with well <br /> screens from 45 to 65 feet below surface grade (bsg). Groundwater samples from <br />