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�� s <br /> Former BP Service Station4 o. 11193 Page 4 <br /> 3202 West Hammer Lane September 29, 2011 <br /> Stockton, California 95209 <br /> 03/07/02 Date of Dual-phase Extraction Summary Report submitted by SECOR <br /> International Incorporated that reported the results from the DPE test and <br /> concluded that DPE was not an effective remedial alternative for this site. Report <br /> available on Questys, file XR0002951. <br /> 09/15/03 Date of Revised Interim Remedial Action Plan and Work Plan for Ozone Sparge <br /> Well Installation and Additional Off-site Assessment submitted by SECOR <br /> International Incorporated that proposed the replacement of groundwater batch <br /> extraction with an ozone sparging system and additional delineation of the off- <br /> site petroleum hydrocarbon and MTBE plume by installing two additional wells. <br /> 03/29/04 Date of Addendum to Revised Interim Remedial Action Plan and Work Plan for <br /> Ozone Sparge Well Installation and Additional Off-site Assessment submitted by <br /> SECOR international Incorporated that proposed the advancement of two CPT <br /> borings and collection of HydroPunch® grab groundwater samples to evaluate <br /> the stratigraphy and potential petroleum hydrocarbon contamination in the <br /> deeper zones below 50 feet bsg. <br /> 03/31/04- Dates when 10 ozone sparge wells, OS-1 through OS-10, were installed onsite. <br /> 04/02/04 <br /> 04126104- Dates when an ozone sparge system was installed at this site. <br /> 05/07/04 <br /> 05/25/04 Date when the ozone injections were begun. <br /> 06/08/04 Date when batch extraction was terminated. <br /> 07119-20104 Dates when soil borings CPT-1 and CPT-2 were advanced onsite to total depths <br /> of 120 feet bsg. <br /> 0$113104 Date of Ozone Sparge Well Installation and System Installation and Start-up <br /> Report submitted by SECOR International incorporated that documented the <br /> successful results from the interim groundwater batch extraction performed over <br /> a four-year period at this site, and described the installation and official start-up <br /> of the ozone sparge system on May 25, 2004. Report available on Questys, file <br /> XR0002929. <br /> 09/22/04 Date of CPT Vertical Site Assessment Report submitted by SECOR International <br /> Incorporated that reported the groundwater analytical results and lithologic <br /> characterization from the CPT investigation. Report available on Questys, file <br /> XR0002928. <br /> 01/18/05 Date when MW-11 and MW-12 were installed off-site. <br /> 03/24/05 Date of Off-site Monitoring Well Installation Report submitted by SECOR <br /> International Incorporated that documented the installation of MW-11 and <br /> MW-12. Report available on Questys, file XR0002938. <br />