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Mr Daniel K Barber <br /> D K Barber& Associates <br /> ,�6 April 30, 2001 <br /> ' Page 3 of 4 <br /> I <br /> I <br /> I <br /> GEOLOGIC LOGGING, FIELD SCREENING AND SAMPLING <br /> Results of Geologic Logging <br /> Boreholes wereeolo icall logged in accordance with the visual method of the Unified <br /> g g Y gg <br /> I Soils Classification System [USCS] in order to to identify the site stratigraphy and assess <br /> potential migrational pathways (copies of borehole logs included as Attachment A) <br /> ' Shallow site stratigraphy consisted predominantly of silt and silty fine sand with minor <br /> clayey sand and clayey silt There were no readily discernible pathways for potential <br /> contaminant migration noted (i e significant variations in horizontal or vertical porosity) <br /> Groundwater was encountered in three of the four boreholes (when SES was in the field <br /> a fifth bore was drilled later by Mr Barber) at depths of approximately 52 feet below <br /> grade While water levels were measured within 15 minutes after encountering <br /> groundwater (i e full equilibration of water levels may not have been reached), <br /> ' groundwater was not observed to rise, indicating unconfined conditions <br /> ' Field Screening for Contamination <br /> Potential organic contamination was evaluated in the soil cores by screening soil samples <br /> ' (at depths corresponding to soil sampling locations) with a photoionization detector (PID) <br /> provided by D K Barber & Associates Approximately 100 grams of soil sample was <br /> placed in a.ZiplockTm bag, sealed, and allowed to equilibrate for at least two minutes <br /> 1 before screening As summarized on the borehole logs, PID readings were close to <br /> background readings except in borehole C-2 at approximately 34 to 40 feet bgs where the <br /> 1 PID reading was 23 to 26 parts per million by volume air (ppmv) A careful examination <br /> of the soil cores indicated no visual or odiferous evidence of contamination, except at the <br /> above referenced interval in bore C-2 The PID was not used at bores C-3 thought C-7 <br /> tNo obvious staining or odors indicative of contamination were noted during the field <br /> work except where indicated in the borehole logs <br /> Stellar Environmental Solutions <br />