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<br /> .� S r`I 1� February 2002
<br /> ' • , i + 1. 11 <r5 L 1
<br /> ,. AGE'N0Pr6je6t"No .95 0114
<br /> ' a +{Page%3�of 6 - .� ,, �` _�. . + � i i•. •"u
<br /> The data indicated the following site'conditions transmissivity Was,cal&dlated at 4,3 53-gallons
<br /> peri day/ft,and a:'storativity value was'calculated'at 0.18."Based-on'a tr`ansn-issivity value of•`
<br /> ' 'r
<br /> ` •'583 ft''/day`an , an extraction well=s creen•thickness'equal-,to 25 ft'(screen'iitterval at,EW 1),
<br /> a hydraulic conductivity value :eras calculated.at 0.061 cm/s; the hydraulic conductivity is
<br /> .
<br /> C w ` `interal`ocaed with
<br /> , n a silt or a:srlty to ffi e'sand '.
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<br /> 23, GROUND WATER DEETRAND FLOW-MRECTION
<br /> I Based on the ? titled Lines of qual-Depth °t o' Groundwater Spring 1999-published by the San-
<br /> Joaquin CountyFlood Control District and Water Conservation District(FCD&WCD),the estimated
<br /> " depth to ground water at the'site is approximately 30 feet bsg; the map Lines.of Equal Elevation
<br /> Groundwdter Spring 1998 (FCD&WCD)-indicates that the regional ground Waterflow'direction is.
<br /> towards the northwest"arid west.
<br /> On-site ground water measurements between May-1995 and the.present indicate that the depth to
<br /> ground water has risen,.from 50 feet.bsg to approximately 22 feet bsg,.and the general ground water "4
<br /> flow direction has been towards-the east and northe'ast.,Ground.-water elevation contour maps for the
<br /> •, site were-included rn previous quarterly repal-ts prepared,by AGE.
<br /> Based on ground water monitoring data at the site 'and historical"depth tb ground-water maps z
<br /> (FCD&WCD) dating back to 1971, the,depth to ground.water at the,site has-fluctuate'd between 40
<br /> feet'bsg and 60 feet bsg.
<br /> 3.0: SCOPE OF .WORK _
<br /> ,.To assess the vertical arid•lateral extent-of solvent=impacted soil and ground water northeast of the
<br /> site'and in the former UST area on the site,''complction.of the following tasks-is required:' '
<br /> Permitting and pre-field work activities;
<br /> }. : Ct?T drilling,.sample`collection and-arialysi5;:
<br /> 5 Preparation of a rcport of firidings.
<br /> " 31." PERMITTNIG AND'PRE-FIELD•WORK'ACTIVITIES
<br /> Site' assessment boring permits will be obtained from the EHO for all on-site-and off-srte"well' • V
<br /> `: .. ''locations. In addition, encroachment or'access pernuts or"permission will-be`obtaine'd.:frorirthe'City
<br /> of5tockion.(COS).and'the Stockton Unified School-District (SU,SD):to'assess ori,the'ir properties.,
<br /> ', `Advanced_,eoEnvironmental Inc, " `
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