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CHRONOLOGY <br /> 400 N EL DORADO <br /> LOP SITE CODE: 506606 <br /> APN: 139-070-09 <br /> 04/14/97 Foothill Engineering submitted a work plan(WP)to investigate the site for gasoline contamination <br /> in the areas of three USTs as a result of a property transfer. The site has 3 USTs that were closed <br /> in place with sand in 1967, under the sidewalk on the westside of the facility. Four slant soil <br /> borings would be drilled near/under the USTs closed in place. <br /> 05/06/97 EHD received a report prepared by Foothill which contained the results from the soil samples <br /> collected from the 4 borings that were drilled on 4/18.97. Sample PB 1 at 20 feet contained 16200 <br /> ppm TPH-gas,49.2 ppm toluene, 308 ppm ethylbenzene,and 1920 ppm xylene. <br /> 06/30/97 EHD filed an Unauthorized Release Report and a Prop. 65 for the positive results reported. <br /> 09/23/97 The site was placed in the LOP and a Notice of Responsibility was sent to the R.P.s requiring <br /> additional investigation. <br /> 10/09/98 QST submitted a WP to perform 2 additional soil borings on the eastside of the 3 USTs. Borings <br /> would be completed to groundwater to collect soil and groundwater grab samples. <br /> 06/23/99 QST submitted a report with soil and groundwater results for the 2 borings. All soil results were j <br /> ND,but the water sample(BF-1 at 28 feet)contained gasoline,BTEX,and MTBE in low <br /> concentrations. <br /> F <br /> 11/24/99 EHD approved a WP for the installation of 3 Monitoring Wells(MW)to further define the extent <br /> of soil and groundwater contamination. b <br /> i <br /> 07/07/00 Orion submitted a report which contained soil results from MW installation and results for 2 <br /> groundwater sampling rounds from the 3 on site MWs. One soil sample from MW-1 contained 99 <br /> ppb MTBE. Groundwater from MW 1 contained 7.9 ppb MTBE and MW-2 contained 440 ppb <br /> gasoline with trace amounts of ethylbenzene and xylene. <br /> 03/07/01 EHD,CVRWQCB,D. Hamlin with Bridgestone/Firestone and H.Takach with Orian met and <br /> discussed the finding from the investigation. It was decided to install an additional data point <br /> downgradient of MW 1 and MW2 to further define the extent of MTBE contamination in <br /> groundwater. <br /> 04/04/01 EHD approved a WP to install one additional MW downgradient of the 3 USTs. <br /> 06/27/01 Orian submitted a report containing soil and groundwater data from MW4: soil results from <br /> installation and groundwater results for 2 rounds of sampling. MW4 had 2.4 ppb MTBE in the <br /> first round and ND in the confirmation sample. Groundwater contamination is defined with low <br /> level gasoline and MTBE in MW 1 and MW2(TPH-gas 170ppb,MTBE 5 ppb). <br /> 08/31/01 EHD began processing this site for closure. A 30 day concurrence letter will be submitted to the <br /> CVRWQCB. <br /> I <br />