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• <br /> PHS, EHD required a workplan for investigating the extent of <br /> contamination at the site must be submitted to the County EHD by <br /> January 15, 1995 , see EXHIBIT B for details <br /> February 15 , 1995 - Wm J Hunter & Associates, (WJH) submitted a <br /> workplan for placing one (1) soil boring in the center of the <br /> removed UST & converting it to a groundwater monitoring well <br /> April 3 , 1995 - WJH submitted a revised workplan for placing <br /> three (3) monitoring wells as directed by the San Joaquin County <br /> EHD staff . Copies of the workplan & addendum are included as <br /> EXHIBIT I <br /> June 29, 1995 - Wm. J Hunter, RG, arrived on site at 0800 hours <br /> and marked locations for wells while waiting on drilling rig <br /> Due to unforeseen delays on other Sobs, the drilling contractor <br /> was unable to mobilize equipment, and the operation was aborted, <br /> it was rescheduled for July 11, 1995 . <br /> DETAILS OF WORK PERFORMED UNDER WJH WORKPLAN ADDENDUM <br /> • On July 11, 1995, Mitchell Drilling Environmental mobilized a CME <br /> auger rig & support truck on location, driller was Bart Jurgins, <br /> and helper was Chris Northard After reviewing the workplan and <br /> holding a short safety meeting with Wm Hunter, the geologist in <br /> charge, the rig was spotted on the previously marked location for <br /> MW-1, as shown on PLATE VI Sufficient 5 foot lengths of clean, <br /> 8 1/4" OD auger flights were available to complete one well <br /> before decontaminating flights Two, 18" long, California <br /> Modiified split-spoon samplers were provided; they had been <br /> thoroughly decontaminated prior to bringing on location. Each <br /> barrel was filled with clean, 211 x 6" metal tubes ; all equipment <br /> was cleaned after each use by washing with a TSP/water solution, <br /> and rinsed with clean water. <br /> Drilling began at 0915 hours, surface sediments consisted of dark <br /> brown to black clay loam At a depth of 51 , the blanking plug <br /> was removed, and a core barrel filled with clean metal tubes was <br /> lowered into the flights It was driven from 5 ' to 616" using a <br /> conventional drive hammer, blow counts and core recovery are <br /> detailed on PLATE VII <br /> After retrieving the core barrel from the auger flights, the core <br /> head was removed, and the sampling chamber was laid on a clean <br /> surface The geologist carefully opened the barrel, and removed <br /> the metal sleeves and placed them on the work area. The bottom <br /> sleeve was promptly sealed by covering the ends with teflon tape <br />• and plastic caps, and securely sealing them with duct tape The <br /> 4 <br />