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CHRONOLOGY <br /> 749 SIERRA NEVADA, STOCKTON <br /> 816/87 350 gallon UST removed and soil sample collected at 13.5'. <br /> 914/87 Soil sample results indicated high levels of BTEX & TPH. <br /> 3/9/88 Three monitoring wells installed. <br /> 3/15/88 The three monitoring well were sampled. <br /> 6/14188 Work plan for additional monitoring wells. <br /> 7/7-8/88 Monitoring wells MW4-MW6 installed. <br /> 7/15/88 All six monitoring wells sampled. <br /> 8/25/88 Monitoring well MW7 installed. <br /> 10/30/88 Problem Assessment Report: MW1 & MW2 have free product. <br /> MW1 screened 30'-55' sampled at 10', 30', 35 results ND at DL <br /> .5ppm BTEX and 1 ppm TPH. <br /> MW2 Screen 30'-55' sampled at 15',27',34', all contaminated <br /> MW3 Screen 30'-55' sampled at 10',34',39' all ND <br /> MW4 Screen 25'-55' sampled at 4',27',40' all ND <br /> MW5 Screen 25'-55' sampled at 10',27',39' all ND <br /> MW6 Screen 25'-55' sampled at 10',27',40' all ND <br /> MW7 Screen 25'-55' sampled at 10', 40' all ND <br /> Water at 40' below grade <br /> 1/17189 Work plan for free product removal - bailing MW1 and MW2 twice a <br /> week. <br /> 4/3/89 Letter from RP - water at 47' below grade. <br /> 7/14/89 Letter from RP - 2.25" of free product in MW2, no free product in <br /> MW1. Water at 46'-47' below grade. <br /> 10/5/89 Letter from RP - wells dry. <br /> 12/5/90 Meeting with RP, RWQCB, & PHS/EHD - MW's 1,2,4,6 dry. Can't <br /> access MW's 3,5,7. Recommend converting dry wells to vapor <br /> extraction wells. <br /> i <br />