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GROUND ZERO ANALYSIS, INC. nG D } <br /> h <br /> 1714 Main,Street DEC 2 Z�Q7 <br /> Escalon,California 95320-1927 <br /> Telephone:(209)838-9888 <br /> Facsimile:(209)838-9883 ENVIRONMNT HEALTH <br /> PERMIT/SERVICES <br /> f <br /> December 11, 2007 <br /> Ms. Vicky McCartney <br /> San Joaquin County Environmental Health Department i <br /> 500 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Monitoring Well Destruction and Waste Disposal Report <br />€ H&H Engineering and Construction Facility, 212 Industrial Drive, Stockton, CA <br /> F <br /> Dear Ms. McCartney: <br /> In accordance with your letter dated September 27, 2007 Ground Zero Analysis, Inc, is writing to <br /> document the destruction of the three groundwater monitoring wells at the subject site. The site <br /> location is shown on Figure 1. The former locations of monitoring wells MW1, MW2 and MW3 <br /> are depicted on Figure 2. This letter also documents the proper disposal of waste material <br /> generated by the well destruction. <br /> Monitoring Well Destruction <br /> In accordance with our Workplan for Monitoring Well Destruction dated October 15, 2007, the <br /> monitoring wells were destroyed on November 7, 2007 by C-57 licensed V&W Drilling. V&W <br /> removed the wellboxes, overdrilled the wells with 8-inch diameter augers to total depth and <br /> k <br /> backfilled the boreholes to surface grade with neat cement grout emplaced with a tremie system. <br /> Prior to destroying the wells, they were sounded to total depth to ensure no obstructions were r <br /> present. Destruction was witnessed and approved by EHD personnel. A copy of the well I <br /> destruction permit/inspection notice is included in Attachment A. <br /> i 1 <br /> Drill cuttings and debris were underlain and overlain by visqueen plastic and a composite sample <br /> was collected for waste profiling purposes. The sample was submitted to state-certified Argon <br /> Laboratory (ELAP No. 2359) for analysis of total petroleum hydrocarbons as gasoline (TPHg) by <br /> EPA Method 8015; for benzene, toluene, ethylbenzene, xylenes (BTEX) by EPA Method 8021; for <br /> oxygenate additives and 1,2-dichloroethane (1-2,DCA) by EPA Method 8250 and for LUFT metals <br /> by EPA Method 7000 series. The laboratory report is included in Attachment B. <br /> Water displaced from the wells during grouting was drummed. Samples collected from the drums <br /> were submitted to Argon for analysis of TPHg, BTEX and 1,2-DCA by the methods listed above. <br /> The laboratory report is included in Attachment B. <br /> G:IGROUNDZEIW-EIREPORT51We11DestReport.doc <br />