ARCHIVED REPORTS XR0000770 - Laserfiche WebLink

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S E C 0 R R b 5 Y+' G Petroleum hydrocarbons and fuel oxygenates were not detected above laboratory reporting limits in groundwater samples from borings GP-4 through GP-7 ` 1 Groundwater monitoring has been performed since August 1998 Third quarter 2003 groundwater d< monitoring reported high concentrations (x10,000 ppb) of TPHg in wells, MW-1, MW-5, MW-7, and MW-9 The highest concentrations of benzene (200 ppb) and MtBE (880 ppb) were found in wells "F MW-5 and MW-12, respectively Groundwater flow was to the north-northwest with a gradient of approximately 0 002 to 0 003 ft/ft (Attachment 1) Depth to groundwater ranged from 11 82 (MW-11) ; to 15 19 (MW-3) feet bgs (Attachment 1) x RECENT QUARTER ACTIVITIES (Third Quarter 2003) 1 Performed quarterly groundwater monitoring and sampling (GRi) 2 Prepared and submitted a quarterly summary report 3 Perform off-site assessment 4 NEXT QUARTER ACTIVITIES (Fourth Quarter 2003) ! 1 Prepare and submit a quarterly summary report 2 Perform quarterly groundwater monitoring and sampling 3 Sample irrigation well pending access 4 Perform irrigation well influence study pending access 5 Submit Site Conceptual Model ,.y CHARACTERIZATION/REMEDIAL STATUS Soil contamination delineated? Yes Dissolved groundwater delineated? In all direction except Northeast of well MW-12 m Free product delineated? NIA Soil remediation in progress? No Start? NIA Anticipated completion date? N/A � RECOMMENDATIONSIDISCUSSIONS Offsite assessment northeast of well MW-12 is being conducted in mid-September 2003 Results of the assessment verifying delineation of the plume are anticipated to be available in early October 2003 As of the date of this letter, Lathrop Grammer School was reviewing ConocoPhdlips request to access their irrigation well for sampling Lathrop Grammer School has indicated to Mr Ed Ralston with ConocPhillips that they expect to approve the access agreement during the week of September d i