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Golden Grain Company April 28, 1992 <br /> 02320 1466 Page 2 <br /> Environmental Protection Agency TEPA) methods 50301801518020 The samples were also analyzed <br /> for total lead by EPA method 7421 Historical and recent analytical data are summarized in Table 2 <br /> The laboratory analyses reports, and the chain-of-custody manifest for the February 21 and 22, 1992 <br /> samples are included in Attachment I Maps of dissolved TPH-G and benzene concentrations are <br /> included as Figures 4 and 5, respectively <br /> Discussion <br /> The potentiometric surface elevations in the site-related groundwater monitoring wells increased an <br /> average of 0 22 foot since the last monitoring conducted on August 21, 1991 In the southern part <br /> of the site the groundwater flow direction is to the northeast at a gradient of 0 004 In the central part <br /> of the site the groundwater gradient appears to be nearly flat A sheen (C 0 01 ft) of SP was noted <br /> in MW-2 and MW-4 <br /> Of the eight monitoring wells sampled in February 1992, dissolved hydrocarbons were found only in <br /> samples MW-2 and MW-7 at concentrations of 140,000 and 30,000 parts per billion (ppb) TPH-G, <br /> respectively Benzene concentrations were 20,000 and 6,500 ppb, respectively The greatest <br /> concentration of total lead was found in the sample from MW-2 at 0 31 parts per million (ppm) <br /> Please contact Groundwater Technology's West Sacramento office if you have any questions or <br /> comments regarding this report <br /> • Sincerely, <br /> UtONMgN <br /> GROUNDWATER TECHNOLOGY, INC �l � 4'(S E. <br /> No.03851 0 <br /> SCOTT E GABLE, R E A 3851 : * ExpLreS' -3/3 *�A <br /> Environmental Geologist ILtna1+ <br /> Project Manager <br /> E K SIMONIS, R G ��,� `gyp () <br /> Senior Environmental Geologis{-raps S�y/h <br /> SEG/EKS rc � 45 <br /> No 4422 ►. <br /> Attachments <br /> 146BG122 LTR <br /> l�T, t% <br /> _— GROUNDWATER <br /> TECHNOLOGY <br />