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Geofogicaf Technics .Inc. <br /> 2741 quvir Rmd <br /> Modesto,Ca&fomia 95351 <br /> (209)538-64241Fax#538-5852 <br /> Addendum No. 3 to the October 13, 1995 <br /> Additional Site Characterization Work Plan <br /> Former Moresco Property <br /> 16865 Gawne Road <br /> Stockton,California <br /> Project No. <br /> April 8,1996 - <br /> 1.0 ADDITIONAL SITE CHARACTERIZATION <br /> Responding to the SJCPHSEHD's request for a better understanding of the site with <br /> respect to health risk and contaminant fate and transport we propose the following <br /> scope of work in addition to that proposed in the earlier workplans and subsequent <br /> addendums. <br /> 1.1 Lithologic unit testing schedule i <br /> Based on geologic information gathered during the earlier investigation we have <br /> summarized the geology of the site in the upper 100 feet below ground surface in a <br /> sketch cross section. Fo <br /> rP lanning PrP u oses we have identified 4 distinct types of <br /> lithologic units present. .These units reoccur over the 100 foot column. It must be <br /> noted that in most cases these units are not homogeneous but instead exhibit <br /> degrees of intermixing. For this purpose we will assume that a good portion of the <br /> subsurface geology of the site will be represented by testing. <br /> Listed below are sediment descriptions with USCS identifier and their interval of <br /> occurrence (underlined interval is where representative samples for geotechnical <br />} evaluation will be collected from . <br /> • Clayey Silt.(ML) 0-5', 18-21',26-31' <br /> • Silty Clay (CL) 11-18 46-53',67-72',82-93',97-100+ <br /> • Sand (SW/SP) 21-26', 31-41', 57-61',76-82', <br /> Silty Sand (SM) 5-11', 41-46', 72-76',93-97' <br /> Clayey Sand (SC) 55-57' <br /> • Sand &Gravel (GP) 61-67, <br /> We propose to collect a sample representative of each of these four units and test <br /> each for geotechnical parameters and chemical concentration. <br /> I <br />