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Project No.013-10141
<br /> Page No.6
<br /> Chromium at 63 milligrams per kilogram (mg/kg), Nickel at 47 mg/kg, Lead at 9.4 mg/kg,
<br /> and Zinc at 53 mg/kg.
<br /> • Soil samples B-2@10' and B-3@10', collected adjacent to each end of the inactive clarifier
<br /> located within the southern portion of the site building,were reported with concentrations of
<br /> TPH-g at 470 mg/kg and 920 mg/kg,respectively,and ND for TPH-d. Sample B-2@10' was
<br /> reported with concentrations of VOCs including the following: n-Butylbenzene at 5.5 mg/kg,
<br /> sec-Butylbenzene at 2.2 mg/kg, 1,2-Dichlorobenzene at 3.9 mg/kg, 1,3-Dichlorobenzene at
<br /> 0.340 mg/kg, 1,4-Dichlorobenzene at 2.5 mg/kg, Ethylbenzene at 2.9 mg/kg,
<br /> Isopropylbenzene at 1.8 mg/kg,p-Isopropyltoluene at 3.0 mg/kg,Napthalene at 9.7 mg/kg,n-
<br /> Propylbenzene at 4.4 mg/kg, 1,1,2,2-Tetrachloroethane at 2.4 mg/kg, Toluene at 0.650
<br /> mg/kg, 1,2,4-Trimethylbenzene at 26 mg/kg, 1,3,5- Trimethylbenzene at 1.3 mg/kg, m,p-
<br /> Xylene at 18 mg/kg, and o-Xylene at 9.1 mg/kg. Sample B-3@10' was reported with
<br /> concentrations of VOCs including the following: n-Butylbenzene at 4.8 mg/kg, sec-
<br /> Butylbenzene at 1.4 mg/kg, tert-Butylbenzene at 3.6 mg/kg, 1,2-Dichlorobenzene at 3.3
<br /> mg/kg, 1,3-Dichlorobenzene at 0.340 mg/kg, 1,4-Dichlorobenzene at 2.3 mg/kg,
<br /> Ethylbenzene at 0.340 mg/kg, Isopropylbenzene at 0.460 mg/kg, p-Isopropyltoluene at 2.6
<br /> mg/kg,Napthalene at 10 mg/kg, n-Propylbenzene at 1.4 mg/kg, 1,1,2,2-Tetrachloroethane at
<br /> 1.3 mg/kg, 1,2,4-Trimethylbenzene at 22 mg/kg, 1,3,5- Trimethylbenzene at 11 mg/kg,m,p-
<br /> Xylene at 3.4 mg/kg, and o-Xylene at 2.;3 mg/kg. Additionally, soil samples B-2@10' and
<br /> B-3@10'were reported with less than significant concentrations of heavy metals including
<br /> Chromium at 54 and 62 mg/kg,respectively,Nickel at 43 and 50 mg/kg,respectively,Lead at
<br /> 11 mg/kg,and Zinc at 57 and 64 mg/kg respectively.
<br /> Active Clarifier,Wash Rack and Drain
<br /> • According to the laboratory analytical report,soil samples B-4@10',B-5@10', and B-6,B-7,
<br /> B-8, B-9, and B-10@3', collected adjacent to the locations of the active clarifier, equipment
<br /> wash rack and drain located within the northern portion of the site building, were reported as
<br /> ND for TPH-g, TPH-d, TEPH, and LUFT metals; except for a concentration of 13 mg/kg of
<br /> TPH-g detected in sample B-4@10'. Additionally, soil samples collected from B-4, B-5, 13-
<br /> 6, B-7, B-8, B-9, and B10 were reported with less than significant concentrations of heavy
<br /> metals including Chromium ranging from 46 to 51 mg/kg,Nickel from 30 to 40 mg/kg,Lead
<br /> from 4.2 to 5.5 mg/kg,and Zinc from 35 to 50 mg/kg.
<br /> 7.1 Discussion of Analytical Results
<br /> Pertinent Regulatory Agency References
<br /> Krazan's evaluation of the results and findings associated with the soil sampling included referencing the
<br /> Environmental Screening Levels (ESLs) listed the May 2008 RWQCB technical document titled
<br /> Screeningfor Environmental Concerns at Sites with Contaminated Soil and Groundwater.
<br /> According to the RWQCB, ESLs are considered to be conservative. Under most circumstances and
<br /> within limits described by the RWQCB, the presence of a chemical in soil, soil-gas or groundwater at
<br /> concentrations below the corresponding ESL can be assumed not to pose a significant, long-term
<br /> (chronic) threat to human health and the environment. Additional evaluation will generally be necessary
<br /> at sites where a chemical is present at concentrations above the corresponding ESL. Active remediation
<br /> KRAZAN&ASSOCIATES,INC.
<br /> Conducting Assessments Nationwide
<br /> 1310141 United Rentals ISI DRAFT.doc
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