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Site Background Information Five Star Marina <br /> Page 5 of 8 <br /> characteristics (i e hydraulic conductivity, transinissivity, etc ) over their vertical and horizontal <br /> ' extents A flow unit may be defined as a hydrogeologic unit characterized by significantly <br /> greater hydraulic conductivity values than the overlying and underlying units, a flow unit is <br /> capable of serving as a preferred migration route and could potentially allow migration of large <br /> ' contaminant masses over great distances <br /> The model presented is interpretational and will be modified as more data is collected The nine <br /> ' vertical zones identified are as follows (depths are approximate and can vary by several feet <br /> across the site) <br /> ' Vadose Zone - Extending from surface grade to approximately 8 feet bsg (average depth to the <br /> ground water table), the vadose zone is generally comprised of silty clay and clayey silt <br /> exhibiting low to moderate plasticity and consistency <br /> H dro eolo is Unit 1 HU 1 - At the to of the current saturated zone,•nc, HU 1 extends from <br /> approximately 8 feet bsg to depths between 13 feet and 18 feet bsg and is comprised of silty clay <br /> ' and clayey silt exhibiting low to moderate plasticity and consistency Thin, discontinuous lenses <br /> of sandy silt and silty sand are encountered at approximately 10 feet bsg in both the eastern and <br /> ' • western portions of the site <br /> Ify to uulu ni Unit 2HU2� - 11U2 extends from bem cen 13 feet and 18 icet to depths between <br /> 17 feet and 22 feet bsg and is composed primarily of silty sand, sand, and gravelly sand with <br /> grain sites increasing with depth The sandy matLrial is generally underlain by an approximately <br /> 2-foot to 3-foot thick layer of sandy silt This unit is not encountered in soil samples collected <br /> 1 north of boring P20 on the eastern end of the site This unit may be considered a flow unit <br /> Hydrogeologic Unit 3 (HU3) - 1 xtending from the base. of HL2 to depths between 22 feet bsg on <br /> ' the west end ofthe site and 28 feet bsg on the east end, HU3 consists of silty clay and clayey -silt <br /> exhibiting low to moderate plasticity and consistency <br /> H_ydrogeolo a Untt 4 (HU4 -- Beginning at the bottom of 1-1113, HU4 appears to bL limittd to <br /> the western portion ofthe site (terminating east of MW-3), with a maximum thickness of <br /> approximately 7 feet Soil -samples collected at 25 feet and 30 fLct bsg describe a fat, blue-gray <br /> ' clay with high plasticity, consistency, and toughness \vliic,h may act as a confining layer <br /> I 1 dro ,colo gic Unit 5 (HL5) - I xtending from depths betNkLen 21 fcLt and 29 feet to as dLLP as <br /> ' 32 feet bsg, HU5 consists of f111L-grainLd silty ,and and bandy slit This unit is not encountered <br /> in 1,011 samples collected north of boring 134 on the \`e-It end 01-thL site Phis u111t niay he <br /> LOnsidc.iccf a f1DX,' unit <br /> l�yLhO_g ,aQjJIL tlntt fI (I IL iii - X16 LOns sus o, ri ;a' h3 U -gray LIay W th l"1011 plastiLlt r <br /> 01Y SILL, i � L(,Tl 11'11L� 1,1�C —'III I" �n 01111k I-C, <br /> h tri r! i z� 3ri o <br /> 1 <br />