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�./ Post-It-brand fax transmittalmemo 7671 #of pages ► <br /> To From <br /> �/� �y <br /> Co. C Co. <br /> Smio"IN COUNTY Dept. Phone# <br /> EWARMEMTAL MEALTM DNIMN <br /> Fax# �r� Fax# <br /> P.O.Box (M4WWO <br /> M, [� �.QCpA�9r=1.0388 L 0 <br /> PWO: ) O <br /> Uj� ed <br /> Q Approved w4h chargee: Sea RWWks <br /> ❑Disapproved: See Remarks Geo(agicafTechnics Inc. <br /> Remarks LAW- ok�W"VCZ 2741 zw%pmd <br /> ,4.dcm C. mesa 93351 <br /> UTL i W d pa915M-s424ffa.L•SM-052 <br /> b pG4 60 A4 <br /> Addendum No.3 to the October 13,1995 <br /> Date4.^2S-ak° U6-4 Additional Site Characterization Work Plan <br /> Approval of these plans extends only to that Former Moresco Property <br /> h 16865 Gawne Road <br /> w ICh Is shown and described hereon but Stockton,California <br /> does not authorize.or approve any omission project No.251.2 <br /> or deviation of requirements of State Paws or April 8,1996 <br /> Local Ordinances: <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 workplan and subsequent <br /> addendums. <br /> Ll Lithologic unit testing schedule <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. For planning purposes 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 /> a <br /> occurrence (underlined interval is where representative samples for geotechnicl <br /> al <br /> evaluation will be collected from. <br /> • Clayey Silt(ML)0-5',1&-21',26-31'. <br /> • Silty Clay(CL)1111=18',46-33',67-72',82-93',97-100+ <br /> • Sand(SW/SP)21-26'.31-41',57-61',76-8Z, <br /> Silty Sand(SM)5-11',4I-46',72-76',93-9T <br /> Clayey Sand(SC)53-57 <br /> • Sand&Gravel(GP)61:6T, <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 />