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' kn KLEiNF ELDER <br /> according to the Unified Soil Classification System (USCS), and collected soil samples <br /> Boring logs and a USCS legend are included in Appendix B <br /> ' Soil encountered in the vertical borings drilled at the ends of tank T1 was predominantly <br /> well sorted fine grained sand and silty sand from the ground surface to approximately 20 <br /> feet, grading to mostly silt from 20 feet to the total depth of each boring (25 feet) <br /> Soil encountered in the angle borings under T2 and T3 was generally silty fine grained sand <br /> ' to well sorted fine grained sand with occasional 0 5 to 1 foot thick interbeds of silt from the <br /> ground surface to the total depth of each boring (equivalent vertical depth of <br /> ' approximately 18 feet). <br /> ' 3 3 SOIL SAMPLING <br /> Soil samples were collected at 5 foot intervals for field screening, lithologic logging, and <br /> ' possible laboratory analysis Samples were collected by drilling the boring to a point <br /> immediately above the desired sampling depth and then driving (vertical borings) or <br /> pushing (angle borings) a Modified California Sampler, lined with three brass tubes, into <br /> the undisturbed soil The sampler was then removed from the bottom of the boring and <br /> the brass tube retained for possible laboratory analysis was immediately sealed with Teflon <br /> tape and plastic caps It was then labeled, logged on a chain-of-custody, and placed in an <br /> iced cooler for transport to the analytical laboratory The remaining two tubes were used <br /> ' for lithologic logging and field vapor screening <br /> 3 4 FIELD ORGANIC VAPOR SCREENING <br /> An organic vapor detector (Photovac TIP), using a photolonization detector (PID) was <br /> used to provide a qualitative screening of each soil sample collected from the borings The <br /> ' PID measures ionizable compounds (with excitation potentials less than 10 6 eV) in the air <br /> in parts per million by volume (ppmv) Field calibration was performed using 101 ppm <br /> isobutylene span gas Ambient air was used to set the instrument to zero The soil <br /> ' contained in the cone of the sampler or in a brass tube was exposed and screened with the <br /> organic vapor detector immediately after the drive sampler was opened The vapor <br /> reading was noted as the field screening result on the boring log (see Appendix B for logs). <br /> ir <br /> FR25-91-29 Page 5 of 11 <br /> ' Copyright 1991 Meinfelder,Inc <br />