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Mr Daniel K Barber <br /> D K Barber& Associates <br /> June 21, 2002 <br /> Page 2 of 5 <br /> BORE INSTALLATION AND SAMPLING PROCEDURES <br /> On June 5, 6 and 7, 2002 exploratory boreholes and monitoring wells were installed at <br /> the Western Oil and Spreading Acamp Plant site in Lodi, California tinder direct <br /> supervision of SES California Registered geologist, Mr Fred Hayden The field program <br /> was being conducted in accordance with the approved workplan completed by the prime <br /> ' consultant and project site manager, Mr Dan Barber, P E , of D K Barber & Associates <br /> The locations of the boreholes and monitoring well installed are shown on the attached <br /> ' figure (base map provided by Mr Barber) Initial exploratory bores were attempted using <br /> a hydraulic-powered, percussive, direct-push method (GeoProbe"m), which advances an <br /> I approximately 3 25-inch outside diameter (OD) hollow steel drive string that is lined with <br /> plastic or brass sampling sleeves However, this technique met with drilling refusal and <br /> was abandoned A hollow stem auger rig was then brought on site to complete the bores <br /> and wells <br /> A total of 7 exploratory boreholes were advanced between June 5 and 7, 2002 and six of <br /> the seven bores were completed as monitoring wells Soil sample locations are recorded <br /> on the borehole geologic logs (Attachment A) D K Barber & Associates subsequently <br /> completed groundwater monitoring at the 6 wells following the well development <br /> ' GEOLOGIC LOGGING, FIELD SCREENING AND SAMPLING <br /> Results of Geologic Logging <br /> The seven boreholes were geologically logged in accordance with the visual method of <br /> ' the Unified Soils Classification System [USCS] in order to to identify the site <br /> stratigraphy and assess potential migrational pathways (copies of borehole logs included <br /> 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 or conduits for <br /> potential contaminant migration noted (i e significant variations in horizontal or vertical <br /> porosity) <br /> Groundwater was encountered in six of the seven bores The first bore, drilled by the <br /> geoprobe rig, encountered refusal at 20 feet bgs, and did not encounter groundwater All <br /> Stellar Environmental Solutions <br />