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<br /> 04 May 2000
<br /> AGE NC'Prot ect•No. 9 5 011,4
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<br /> 3.o,, FINDINGS
<br /> n .
<br /> Ground 'water flow direction;and gradient were, calculated frorri= the field. ,data.-The currertt
<br /> ; distribution of dissolved petroleum hydrocarbons.and-dissolved 'chlorinated hydrocarbons.,were �
<br /> ;'. 4.
<br /> inferred-from laboratory analytical results oFthe groundwater samples.
<br /> STRATIGRAPHY
<br /> A dark brown silty fine sand was encountered from'surface-grade to approximately S feet bsg. A silty '
<br /> clay- was'generally encountered from 5-to 50'feet bsg. From•50 feet to 55,feet bsg the•lithology was
<br /> .. silty fine sand. At'55- feet bsg a gray medium grain sand was encountered. Frons.55 feet to 65 feef
<br /> bsg the lithology consisted of silty fine sand..The''boring logs are,included as Appendix A. A'
<br /> stratigraphic cross section is depicted in Figures 4. ...
<br /> Organic vapor was detected-in soil samples from borings SB1 and SB2 at'concentrations as high,as
<br /> 7,574.ppmv (SB2 at 35 feet bsg). Organic vapor was not'detected in soil samples collected from `
<br /> boring MW-7. Boring MW-6"was'not sampled, therefore there are no PID readings from this boring.-
<br /> PID
<br /> oring.PID data is included on the boring logs (Appendix A).
<br /> 3:2. ,PETROLEUM HYDROCARBON-IMPACTED SOIL
<br /> TPH-ss was reported in 12 of the 18 soil samples collected in January,2000'from borings SB 1', SB2,
<br /> and•MW7 at concentrations as high as 5,100 milligrams per kilogram (mg/kg). Ethylbenzerie was
<br /> _ reported in the soil samples SBI=50 and SB2-20, at-concentrations of 0.012 mg/kg and.0.44 mg/kg,.
<br /> respectively. Benzene was not reported above laboratory reporting limits in an of the soi.Fsamo les 1 '
<br /> . - p Y• . P rY p g Y p -I, • a :
<br /> collected. `.
<br /> Anal Ical results of soil samples afe summarized in Tables 2. The laboratoryre ort KiffAnalytical. ` ~ `
<br /> re ort number 15883 ualit assurance and 'ualit control Al C re ort and chain-of-custod '
<br /> p ),.g Y q Y . (Q Q ) p y'
<br /> form.for the January 2000 soil sampling event are included in Appendix D. "
<br /> 3.3. - CHLORINATED HYDROCARBON-IMPACTED SOIL
<br /> Chlorinated hydrocarbons.were,reported in 16 of the 18,soil.samples collected in January 2000 from
<br /> borings SBI, SB2; and MW7. The chlorinated compound reported with the highest.concentiration
<br /> " .in.samples collected was n-butylbenzene at 7.1 mg/kg-in boring SB2 at-40 feet bsg. Vinyl:chloride
<br /> s 'coli ct d at concentrations as lii ,h a '0:025- mj '
<br /> was reported. in of the 18 soil- sample e e g s g/kg: ,
<br /> Tetrachloroethene (PCE)was reported in 5 6f.the 18'soil samples at concentrations,as high as;0 058;r„
<br /> ,Advanced GeoEnvironmental,Inc.
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