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FIELD REPORT MONITOR WELL INSTALLATION FORMER MAJOR MART FACILITY STOCKTON, CALIFORNIA ' During September 8 through 11, 1992, ROY F WESTON, INC (WESTON) installed three groundwater monitor wells at the former Mayor Mart site located at 1235 East Alpine Avenue ' in Stockton, California The wells were installed on behalf of American Real Estate Group (AREG) in order to gain additional information on the extent of petroleum hydrocarbon compounds in soil and groundwater at the site ' Three soil borings were drilled and converted to monitor wells (MW-4, MW-5 and MW-6) at the site Refer to Figure D-1 for the approximate well locations ' Monitor Well Bonn s ' The monitor well borings were installed using eight inch, hollow stem augers and a truck- mounted drill ng Soil samples for lithologic description were collected from the initial soil boring (MW-4) using a five-foot-long continuous-core barrel sampler and from MW-5 and MW- ' 6 using a split-spoon sampler The continuous-core sampler was placed inside the first five feet of the augers and extended approximately six inches below the end of the auger during drilling operations This allowed collection of relatively undisturbed soil samples at depth for the purpose of lithologic logging. Soil samples were collected for potential laboratory analyses from all three soil borings using a California-modified split-spoon sampler lined with three two-inch- diameter by six-inch-long brass liners Subsurface samples were collected by drilling to the appropriate depth and then driving the sampler ahead of the auger using a 140-pound drive hammer The number of blows required to advance the sampler six inches at every 18-inch ' drive interval was recorded on the boring logs The lithologic and well construction logs for the well installations are included with this field report ' Soil Sampling Soil samples were collected in the well borings approximately every five feet for field screening, ' lithologic logging, and potential chemical analysis One brass liner from each sample interval was preserved for potential shipment to the laboratory The brass liner was preserved by sealing both ends with aluminum foil and tight-fitting plastic caps Each liner was labeled to include ' a unique sample number, boring number, depth of sample, site name, date, time of collection, initials of collector, and any other pertinent information After sample preparation, the brass liner was sealed in a plastic bag and placed in a cooled ice chest Two soil samples from each ' soil boring were submitted to the laboratory for chemical analyses based on volatile organic compound (VOC) levels detected during headspace screening Table D-1 summarizes the samples submitted for chemical analysis 1 ' SPKMP1r51AR£G3QTR WP D - 1 I M2192