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4 <br /> CHRONOLOGY <br /> SOUTHLAND STORE#20304 <br /> 455 GRANT LINE RD. <br /> LOP SITE CODE: 1409 i <br /> APN= 214-490-11 <br /> 03/27/86 Southland performed precision test on USTs and failed test due to leak. <br /> 08/27/86 Three USTs emptied and take out of service. <br /> 11/05/86 PHS/EHD filed a UAR for failed precision test and required investigation. <br /> 11/25/86 Four MWs installed on site and FPPH (floating product) discovered on groundwater <br /> northeast of UST location. <br /> 06/28/88 Soil gas survey completed and report file. <br /> I <br /> 07/18/88 Additional investigation continued and a total of 16 MWs were installed and plume <br /> was defined by this date. <br /> 08/25/88 MW installation report filed and groundwater plume and soil contamination fully ; <br /> characterized; contamination contained to facility boundaries. <br /> 01/10/89 A PAR was filed on this date which defined the contamination from the gasoline <br /> release. j <br /> I <br /> 02/14/89 PHSIEHD issued a permit to remove the 3 existing USTs from the site. <br /> 03/27/89 Three USTs removed this date, no soil samples taken due to ongoing groundwater <br /> monitoring on and off site. <br /> 04/09/91 Site placed in the LOP and a Prop. 65 filed for the gasoline release which impacted <br /> groundwater. <br /> 01/30/92 Harding Lawson submitted a "Soil and Groundwater Remedial Action Plan"for <br /> corrective action. <br /> 05/11/93 Groundwater extraction well GWE-1 was installed northeast of former USTs. <br /> 09/20/95 Groundwater treatment system installed. <br /> 10/20/95 Groundwater extraction system startup and tested with poor results. <br /> 04/20/96 System was shut down due to inability to depress groundwater level. <br /> 07/05/96 Flor Daniell GTI proposed installation of two additional groundwater extraction wells <br /> to depress levels in order to vapor extract sails in the vadose zone. <br /> 10/23/96 Two additional groundwater extraction wells were installed: GWE-2 and GWE-3. <br /> 11/07/96 Well GWE-2 and GWE-3 were tested with little draw down and poor results. <br /> 12/06/96 Extraction well installation and test report submitted. <br /> i ' <br />