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Quik Stop Station No. 076 Page 2 <br /> 1030 South Olive Street July 29, 2010 <br /> Stockton, California 95215 <br /> 10/28/03 Date of Results of Additional Groundwater Investigation submitted by Horizon <br /> Environmental Inc. that reported the results from the installation of MW-1 and <br /> performance of the sensitive receptor survey. <br /> 05/02/05 Date of Transmittal of Well Permit Application submitted by Horizon <br /> Environmental Inc. that described the replacement of MW-1 by re-drilling the <br /> borehole of MW-1. <br /> 06/01/05 Date that MW-1 was destroyed and replaced by re-drilling the borehole of MW-1 <br /> and re-installing MW-1 with a screen interval from 60 to 80 feet bsg. <br /> 06/20/05 Date of Replacement of Monitoring Well MW-1 submitted by Horizon <br /> Environmental Inc. that reported the results from the re-installation of MW-1. <br /> 10/07/05 Date that MW-1 and soil borings SB-1 through SB-3 were surveyed by Virgil <br /> Chavez Land Surveying. <br /> 03/18/09 Date of Soil Gas Investigation Work Plan submitted by Horizon Environmental <br /> Inc. that proposed the installation of five soil gas sampling points (SG-1 through <br /> SG-5). <br /> 05/19/09 Date that soil gas samples were collected from five soil gas sampling points. <br /> 06/26/09 Date that additional soil gas samples (SG-3-2 and SG-3-2 DUP) were collected <br /> near soil gas sampling point SG-3. <br /> 07/10/09 Date of letter from the EHD directing the reduction of monitoring and sampling <br /> MW-1 from quarterly to semi-annually. <br /> 11/05/09 Date of Soil Gas Investigation Report submitted by Horizon Environmental Inc. <br /> that reported the results from the collection of soil gas samples and <br /> recommended that a No Further Action Required(N FAR) Request be submitted. <br /> 01/04/10 Date of letter from the EHD requesting an explanation of the reported results and <br /> conclusions of the soil gas investigation submitted by Horizon Environmental Inc. <br /> 05/04/10 Date of letter from Horizon Environmental Inc. clarifying the soil gas sampling <br /> results. <br /> 05/18/10 Date the California Regional Water Quality Control Board Central Valley Region <br /> directed the EHD by email to submit the Case Closure Summary and Chronology <br /> for their thirty-day comment. <br />