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11 ! <br /> �.� BLOCKBUSTER VIDEO <br /> YELLOW SUBMARINE <br /> 140 W. H uwiNG Avm, SwuTON, CA <br /> QUARTERLY GROUND WATER SAMPLING REPORT <br /> DECEMBER, 1992 <br /> 1 <br /> �I <br /> Narrative ^ <br /> On December 14, 1992, WHF Environmental Consultants, Inc., in conjunction with <br /> HKM, Inc., conducted field measurements, well pumping, and groundwater sampling <br /> on three ground water monitoring wells located at this site. Monitoring well #3 is used <br /> ' for gradient purposes only and was not sampled, due to grout inside the well casing. <br /> Samples are taken from MW-4, which is not included in calculating the gradient <br /> because of its proximity to MW-1. <br /> Ground water elevations were taken from all four wells prior to the pumping of the <br /> three wells (Table 1). Each well was evacuated by means of a steam cleaned, stainless <br /> steel bladder-type pump. At least three well volumes were pumped ficaeach well. <br /> During the three volume pump down of each well, samples were collected to measure <br /> field pH, electrical conductivity and temperature. Once stability was achieved, and a <br /> minimum of three well volumes were removed, the samples were collected. The <br /> samples were then labeled and placed in an ice chest with Blue Ice and crushed ice. <br /> I' The samples were then logged on a chain of custody and sent to GeoMonitor, Inc., a <br /> state certified laboratory located in Hesperia, California, for analysis. The analysis <br /> L requested for the three water samples was EPA method 602 for benzene, toluene, ethyl <br /> benzene and xylenes, and EPA method GCFID 3510 for kerosene. The analytes and <br /> concentrations detected are listed in Table 2 of this report. <br /> The ground water gradient direction has swung back to a northeasterly direction from. . <br /> the southwesterly direction measured on September 30, 1992, and slopes to 0.0076 feet <br /> per foot. The reversal of gradient is due to a rise in the water table elevation in MW 1 <br /> (0.68 feet), MW-2 (0.62 feet) and a drop in the water table elevation in MW-3 (0.48 <br /> ' feet). The ground water elevations noted in this quarter's measurements are referenced <br /> in Table 1 of this report. <br /> I� <br />