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' Site Background Information Five Star Marina
<br /> Page 6 of 8
<br /> bottom of HU5 to depths between 29 feet and 37 feet bsg
<br /> Hydrogeologic Unit_? (HU7) - Extending from between 29 feet and 33 feet bsg to approximately
<br /> 32 feet to 36 feet on the west end of the site and to approximately 36 feet to the total depth of
<br /> boring B5 (40 feet bsg) on the cast end, HU7 consists of fine-grained sandy silt and sand This
<br /> ' unit may be considered a flow unit
<br /> ' Hydr�gic Unit 8 ,HUB - HU8 consists of a fat, blue-gray clay with high plasticity,
<br /> consistency, and toughness which may act as a confining layer This unit is encountered from the
<br /> bottom of HU6 to the total depths of the borings on the west end of the site (40 feet bsg) This
<br /> ' unit was not encountered on the east end of the property, but may be located below the total
<br /> depth of boring B5
<br /> SITE CGNCEPTUAf. MODEL '
<br /> Based on the data collected to date from soil borings and monitoring well installations, AGE has
<br /> ' developed a SCM for the release, migration, and distribution of the contaminants in the J
<br /> subsurface as described below
<br /> ' The soil profile beneath the ote is generally composed cel silty clay and clayey Silt Froin SuifaLL
<br /> grade to approximately 15 feet bsg, sandy material (silty Sand, sand, and gravelly sand, grain
<br /> ' ,,irc increases with depth) underlain by an approximately 2-foot to 3-foot thick layer of sandy
<br /> Silt, i5 encountered from approximately 15 feet to 20 feet b,,g, Silty clay, clayey silt, and sandy
<br /> Silt with prominent tunes of fat, biuc-gray clay with high pla„ ticity, consi„tency, and toughne”
<br /> t1,, encountered from 20 feet to 40 feet h„g o1 beyond
<br /> Since initiation of ground water monitoring in January 1998, depth to ground water
<br /> ' incasurc,mcnts have fluctuated between approximately 6 teet and 9 5 feet below the top,, of the
<br /> well casing,, The inferred ground water flow direction generally has been toward the northca,,t at
<br /> gradients ranging bttWLe:n 0 001 foot per foot(ft/ft) and 0 01 ft/ft Graph,, illu„trattng depth to
<br /> ' ground water and ground water elevation trend,, arc. included in Appendix >
<br /> Rclea„c,, of petrolcum hydiocarhons occurred from the. f01-111Ci cin-Situ \tc,,tcm (550-gallon) rnu
<br /> ' ca„ tcxn (4 000-gallon) US f,,, a,, dc,,ci iheci bc,lo-”
<br /> lf1"S 11 1�1� tI5'1'AFI I' { SI 111) �IIC,1; 1TIC)1'
<br /> "11�e ��c,,tc71 . 5 I NN a,, rci7luGed rIOM [11L MtL on 16 WY
<br /> tot�il volatile hydrocarhon,, ( ''!'fi)
<br /> ' ,ind 13-11 X here dctcctcci It cnncciitration,, =1,, high a,, 7,000 mglkg in i ,,inglL Soil ,,amblc
<br /> eolle.c.ic,ci fjjv i the botturri n, the I. LaN'LitMil. Onee. i(.lea,,0el to tiiL ,,ub,,UrL1LL t11C (_nntamina -)L,,
<br /> „tf 1i�tL ��lEILI I' 91�f i�hr silt Z, Zi .I��yL�� litl�f <!� C141eiii i7�1(i�t t1', L '-)I _ttL_ % 11 l i f'1"11L " C
<br /> 11�c+ rd etli III Itmuo ,
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