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r� <br /> Mr. Darrell Robinson <br /> Pre-Tank Pull Soil Assessment <br /> June 7, 1988 <br /> Page 2 <br /> Preliminary Screening Results <br /> of the Soil Samples Collected <br /> } <br /> Total Organic Vapors in Parts per million <br /> Sample Depth <br /> t; <br /> Bl X-A DU Bu j L_a <br /> E <br /> 5.5-6.0 0 0 <br /> I0.5-I1.0 I. 0 0 0 0 <br /> x lS.S-16.0 0 I 2 0 0 0 0 0 <br /> 20.5-21 0 0 0 0 0 0 0 0 <br /> 0 0 0 0 <br /> . 25.5-26.0 0 0 0 . 0 _ <br /> NOTE: - r - <br /> Soil sample not taken. <br /> 5 Clayey to sandy silts to silty clays were observed to a depth of 26 feet at sail baring <br /> locations observed <br /> through dep Silty clays to clayey silts with lens Of silty sand to sand <br /> were observed to a depth <br /> Approxiof_16 feet at soil boring location B-7 and B-8. <br /> mately 16 feet of clayey to sandy silts to sil <br /> ty clays were observed in soil <br /> borings.B-5 and B-6. See attachment for soil boring logs. <br /> 31 <br /> Preliminary screening with a total organic vapor analyzer of the soil samples collected <br /> at specific intervals at the eight soil boring locations did not detect the presence of <br /> petroleum hydrocarbons. <br /> Delta recommends that the excavation of the existitt tanksJ. <br /> S proceed. We also <br /> recommend a geologist be on-site to observe the tank pull and to sample the soils a <br /> the bottom of the underground storage tank excavation in. accordance with <br /> tank c►osure procedures. <br /> Proper <br /> ' Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> Michael J. O'Brien <br /> --r- - —..___ __.-.. ----- ----- --------Hydrogeologist/----- ------ ----- ----- — ------ ------- ----- ----- -- -- - -- <br /> Project Manager <br /> MJO:crts <br /> cc: Tod D. Christenson <br /> St. Paul Office <br /> } <br />