ARCHIVED REPORTS XR0005781 - Laserfiche WebLink

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attempt to define the limits of the soil & groundwater plume which extends off the site The County EHD wanted some minor changes, and a workplan addendum was prepared on August 16, 1995 to address those changes A copy of the workplan & addendum is included as EXHIBIT A. On September 28 , 1995 , San Joaquin County Dept of Public Works issued encroachment permit #95-312-CC to WJH/M. Sanchez allowing the placement of the soil probes, a copy of that document is attached as EXHIBIT B The San Joaquin County PHS, EHD approved the drilling permit application on 10/16/95 - see EXHIBIT C On October 25, 1996, Transglobal Environmental Geochemistry (TEG, ) mobilized a STRATAPROBE unit & portable lab on site . The locations for the soil probes had been previously marked and cleared after contacting Underground Service Alert The soil probe unit consisted of a 12-foot hydraulic mast equipped with 5 ' sections of 2" diameter, threaded, stainless steel hollow pipe The bottom 3oint was fitted with a California Modified split- spoon sample barrel filled with 1 1/2" brass tubes All equipment was thoroughly decontaminated with Alconox & double- rinsed with clean water prior to, and after each use The DHS certified mobile lab, (#2012 , ) run by Henry Wilkinson of TEG, was set up on Mission Street next to 1876 Country Club, (Walts Refrigeration ) Operations began at 0930 under the direction of Wm. J Hunter, RG, from Wm J Hunter & Associates The probe truck was located on the previously marked location P-1 ; refer to PLATE II for the locations of the soil probes . After driving through the asphalt, the pipe was pushed & driven to 15 ' bgl The sample chamber was opened & driven to 1616'x . The core barrel was retrieved, the core head removed, and the barrel placed on a clean work surface on the truck. The barrel was opened by the geologist, and consisted of 15" of brown to gray, silty clay with a mottled appearance due to color changes . The clay was firm, very slightly plastic, and moist but not wet A faint_ odor Qf . undetermined origin was detected The bottom tube was promptly sealed with teflon tape and plastic end caps, and taken directly to the onsite lab for analysis . A hydropunch-type tool was attached to clean drill pipe, and was driven to 20 ' bgl . The tool was opened and allowed to set for 30 minutes A 3/8" diameter stainless steel bailer was lowered into the pipe and recovered muddy water Two VOA' s supplied by the onsite lab were filled & delivered to Mr Wilkinson for analysers Upon standing for a few minutes, the water became clear, and very fine sand was noted in the bottom of the VOA. 2