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Mr James L Barton October 29, 2004 Page 6 Groundwater Sampling Analytical Results Groundwater samples collected from well MW-9R were submitted to CLS for analysis of TPHg by EPA Method 8015 Modified and volatile organic compounds using EPA Method 8260B y Groundwater sample analytical results are summarized in Table 1 and copies of the laboratory analytical reports are included in Attachment D TPHg and benzene concentrations are depicted in Figures 8 and 9 Il Well Destruction for MW-9 Groundwater monitoring well MW-9 was destroyed on August 16, 2004, by removing its well box, I followed by over-drilling the casing and annulus to a total depth of 71 feet bgs using 8-inch hollow stem augers Prior to well destruction, the well's total depth was measured to a total depth of 64 8 feet bgs Upon completion, the over-drilled monitoring well borehole was backfilled to within 1 5 feet of surface grade with neat cement grout emplaced from the bottom up via a tremie pipe The remaining 1 5 feet was backfilled with quick-set concrete dyed black to match the surrounding area Field methods and procedures to be used by ENSR during drilling and destruction of MW-9 are summarized in Attachment A. Soil Stockpile Waste Drilling activities generated approximately 25 cubic yards of soil cuttings during the installation of MW-9R and destruction of MW-9 The soil cuttings were placed in ten 55-gallon Department of Transportation-rated (DOT) drums and temporarily stored onsite One soil sample was I l collected from the drums and submitted to CLS The sample was submitted for analysis of TPHg, BTEX, and VOCs using previously described methods Additionally, the sample was analyzed for total lead using EPA Method 6010B On August 23, 2004, a total of twenty-one 55-gallon DOT drums of soil cuttings and three 55-gallon DOT drums of ansate water generated during the installation of groundwater monitoring wells MW-28, MW-29, MW-30 and MW-9R and destruction of groundwater monitoring well MW-9 were transported as non-hazardous waste to IForward landfill in Manteca, CA A copy of the waste manifest is included as Attachment J Purge Water Waste I1 Non-hazardous purge water generated during third quarter 2004 groundwater monitoring and sampling activities was transported to Evergreen Oil Company in Newark, California, on August 27, 2004 f i f Well Survey s On August 26, 2004, groundwater monitoring wells, and remediation wells were surveyed for X, Y, and Z coordinates by a California-licensed land surveyor in accordance with State of ' California Assembly Bill AB2886 The top-of-casing elevation of the wells and ground surface elevation were surveyed relative to mean sea level within 0 01 foot A copy of the survey results E is included as Attachment K I11DcsacramentolprojectslProjects\06940\5098-2931FinaWepoTt\ouarterty Mondonng Reports15098 3rd CW 04-QMR doc ICelet7 affno 3; Years of�xcelr rwe III c+IvrrrtnmenfP 5, rVice5 ,