SITE INFORMATION AND CORRESPONDENCE

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' k Grewal's Market Page 3 4100 East Fremont Street February 23, 2011 i 08/14/07 Date that soil vapor probe borings.P-13 and P-14 were advanced at this site. 12/05/07 Date of Addendum to Monitoring Well Installation Work Plan — December 2007 submitted by Advanced GeoEnviron mental, Incorporated, that proposed the installation of one off-site monitoring well, and the advancement of three on- and off-site soil borings for the collection of grab groundwater samples to assess the impact of 1,2-dichloroethane in the shallow, intermediate and deep zones. 12/10/07 Date of Soil Vapor Investigation Report submitted by Advanced Geo Environmental, Incorporated; that reported that no constituents of concern were detected in'the soil vapor samples collected. , 03/05/08 Date of Revision to Work Plan Addendum-December 2007, dated 05 December 2007, submitted, by Advanced Geo Environmental, Incorporated, that proposed the relocation of,the off-site monitoring well and one of the proposed off-site soil borings; and proposed the replacement of the hollow stem auger drill rig with a CPT rig for the advancement of the three proposed soil borings. 03/17/08 Date of letter from the San Joaquin County Environmental Health Department approving the advancement of the three proposed soil boring locations, and recommending that the data collected from the three soil borings be used to determine the location of the proposed off-site monitoring well; and directing that soil concentration . results for contaminants of concern that exceed the Environmental Screening Levels for gross contamination and direct exposure be addressed. 04123-24108 Dates when CPT borings P-15 was advanced to total depth of 73 feet on-site, P-15B was advanced to total depth of 100 feet on-site, and P-16 was advanced to total depth of'100 feet off-site. Grab groundwater samples were collected from P-15B and P-16' 10/14/08 Date of Cone Penetration Testing Site Investigation—2nd Quarter 2008 submitted by Advanced GeoEnvironmental, Incorporated, that discussed the findings from the advancement of CPT borings P-15, P-1513, and P-16. The only constituent of , concern detected was gasoline at 800 micrograms per liter (pg1L) in grab groundwater sample P-1513/65-75. I I 01/23/09 Date of letter from the San Joaquin County Environmental Health Department conditionally approving the installation of one off-site monitoring well, _and directing the submittal of: 1) contaminant mass estimates for sorbed and 1 dissolved methyl tertiary-butyl ether, 1,2-dichloroethane, and gasoline; 2) a fate and transport model; and 3) an evaluation of soil concentrations that exceed Environmental Screening Levels. 05/11/09 Date of letter from the San Joaquin County Environmental Health Department approving a reduction in quarterly sample collection, and collection of a grab groundwater sample in place of installing an off-site monitoring well, and directing the submittal of a work plan addendum to address the collection of the grab groundwater sample.