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i , <br /> TABLE 1 <br /> . SITE CHRONOLOGY <br /> STOCKTON GRAIN ELEVATOR <br /> CONTIGROUP <br /> ' Date Activity _..,,.. ._ . Consultant <br /> Jan-88, UST Removal <br /> Oct-97 SB-1 thru SB-6 advanced and soil and groundwater samples <br /> collected ATC <br /> Nov-97 Subsurface;investigation Report Submitted ATC <br /> r <br /> Aug-98 Additional soil bona installation of MW-1 thru MW-3 <br /> 0 &�, , <br /> samples collected ATC <br /> ' Aug-98 thru <br /> June-02 Quarterly sampling&monitoring reports ATC <br /> Oct-98, Update of Subsurface Investigation ATC <br /> MW-4 thru MW-6 installed, SB-8 thru SB-12 advanced, <br /> ' Apr/Jun-00 samples collected ATC <br /> June-02 CAP submitted ATC <br /> • May thru Site Investigation Report, Installation of MW-7 and <br /> June-04 additional soil borings, sampling H&.A <br /> ' Aug-04 Work Plan for CAP submitted and quarterly sampling <br /> continued Geomatnx <br /> 5 <br /> Geomatnx 1 <br /> Oct-04 CAP submitted . <br /> This Addendum specifically addresses only the area at and immediately adjacent to the excavation for <br /> ' the former 10,000-gallon UST The temi "site" used subsequently throughout the remainder of this <br /> document therefore refers only to the area of the former 10,000-gallon UST <br /> 3. SITE CONDITIONS <br /> The discussion of the occurrence and distribution of petroleum hydrocarbon detections reported for soil <br /> ' and groundwater samples at the site, as summarized in flus CAP addendum, are based on the results of <br /> the previous investigations Reported detections are based on analyses of total petroleum hydrocarbon <br /> (TPH) in either the diesel (TPHd) or gasoline (TPHg) range and for related constituents (e g, BTEX) <br /> An evaluation of the potential nsks to drinking water, surface water, and human health from related <br /> conditions at the site was discussed in the October 2004 CAP Thus discussion has been revised to <br /> describe the source area compared to the hi-ruts of the TPH plume <br /> 1 , <br /> • <br /> 1 <br /> 4 <br /> R 1CDNTGRAN\Stockton\CARCAP ADDENDUM <br />