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Chronology ,,, SITE CODE: 1988 <br /> 1541 Charter Way <br /> Page 2 <br /> � <br /> 12/08/88 Permit for 4 monitoring wells issued <br /> 12/12/88- 4 monitoring wells installed <br /> IJ <br /> 12/13/88 MW-1 in area where 6 USTs formerly located <br /> Screen 24 feet-34 feet 4 inch casing 1 <br /> MW-2 in area where waste oil tanki 11 was formerly <br /> located <br /> Screen 19 feet-29feet 4 inch casing <br /> MW-3 Screen 18.5 feet-28.5 feet 4 inch casing ; <br /> MW-4 Screen 23 feet-33feet 4 inch casing <br /> n <br /> ly 01/31/89 Report of monitoring well installation <br /> Soil samples of MW-1 indicate soil contamination to 20 feet - <br /> Highest contamination at 10 feet B 16 ppm, T 470 ppm <br /> E 210 pm, Xylene 8419 ppm, TPH. 4,000 ppm <br /> 2-Chloroethylvinyl ether .11 ppm <br /> Tetrachloroethylene .3 ppm at 20 feet <br /> MW-2 BTEX ND at .1 ppm sampled every 5 feet from 10 feet-29 <br /> feet <br /> MW-3 only sampled at 20 feet ND:BTEX at .1 ppm <br /> i MW-4 no soil samples taken <br /> Water samples collected 12-15-88 <br /> '1 MW-1 high levels of contamination <br /> Benzene 8,800 ppb, TPH 4811000 ppb Various chlorinated <br /> solvents detected j <br /> Low levels BTEX in MW-2 <br /> MW-3 and MW-4 ND <br /> Gradient south-southwest <br /> Static water at 19 feet Groundwater 22 feet-27 feet <br /> 05/09/89 Site,placed in LOP <br /> 06/89 Soil gas survey conducted - Highest: contamination in former tank <br /> area with migration westerly j <br /> 07/89 Bio Nationalro osed in situ biorel ediation <br /> P P <br /> 07/27/89 Received report of soil gas survey <br /> Dames and Moore recommend additional monitoring wells <br /> 08/22/89 Received work plan for phase II site investigation <br /> P W f, Cr6 k0tbEA <br /> 08,89 eI ' tigation ^ <br /> a� <br /> Q09/25/89 MW- and MWJ6 installed { <br /> J <br /> a �q Cry Ac � �0'U II I IHL` � <br />