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f- <br /> August 23, 2010 <br /> CHRONOL013Y <br /> VANCO TRUCKS OP <br /> 1033 W. Charter Way, Stockton <br /> I <br /> 02/25/03 Underground storage tank (UST) piping updates and soil sampling at- active <br /> vehicle refueling station under EHD permit reveals unauthorized petroleum <br /> product release to soil. New piping insta led and site stays active. <br /> 05/07/03 Site referred to EHD Unit IV for entry intc LOP. <br /> 09/13/03 Date the EHD approves Advanced Gec Environmental's (AGE) Preliminary Site <br /> Assessment Work Plan dated August 1:3, 2003. Plan proposes six soil borings <br /> (131 through 136)to groundwater around impacted trench areas. <br /> 10/30/03 Six Geoprobe borings installed onsite un Jer EHD permit this date. <br /> _ ___..041.051.0.4_ _ ...Date.-EH.D._r_eceives. .AG.E's._report__P_r_eI inary._Site-A_ssessment Report_dated._ <br /> March 30, 2004. Low concentrations of total petroleum hydrocarbons as diesel <br /> (TPHd) in two borings. Elevated concentrations of TPHd (2,200,000 ug/1) in <br /> boring B4 and less in B2. <br /> I <br /> 06/21/04 EHD approves AGE's Site Assessment Work Plan dated May 30, 2004. Calls for <br /> installing five one Penetrometer Test/H droPunch borings (CPTs), SB1 through <br /> SB-5, and three first groundwater monito^ing wells (MW-1 through MW-3). <br /> 07/26/04 Monitoring wells MW-1, MW-2, & MW- installed onsite along with five CPTs. <br /> Data of soil and deep groundwater grab samples in AGE's Additional Site <br /> Assessment Report-August 2004 dated ovember 11, 2004. <br /> 02/08/05 Date of EHD approval letter for AGE's Additional Monitoring Well Installation <br /> Work Plan, dated January 24, 2005 for tl ree onsite additional shallow monitoring <br /> wells, MW-4, MW-5, and MW-6. <br /> 07/29/05 Date onsite monitoring wells MW-4, MW-5 and MW-6 were installed. Report of <br /> installation in AGE's Quarterly Report— Third Quarter 2005, dated November 18, <br /> 2005. i <br /> I <br /> 01/06/06 SWRCB-CUF issues $50,000 Letter of Commitment (LOC) to Van De Po! <br /> Enterprises for this site as Priority ClassC. CUF# 018342 assigned to site. <br /> 07127/08 EHD contacts AGE by email and requests intentions for site since groundwater <br /> data from wells onsite continue to be n n-detect. EHD requests evaluation of <br /> residual contamination to San Francisco Bay Regional Water Quality Control <br /> Board (SFBRWQCB), Environmental Screening Levels (ESL). <br /> 08/25/08 Date the EHD receives AGE's Environm nfal Screen Levels Tier 1, dated August <br /> 21, 2008. <br /> 03/24/09 Date of EHD's letter requiring responsibl party to submit all missing reports, lab <br /> data, maps, etc to Geotracker, and to submit a soil gas sampling work plan by <br /> April 15, 2009. <br />