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<br /> 4633 Soil Characterization Report
<br /> Proposed Parking Structure
<br /> May 27,2005
<br /> Page 2
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<br /> sampling, the core barrel was driven in four-foot intervals. Each soil sample was cut from the liner. The
<br /> soil samples were retained, undisturbed, in the liners. The liners were sealed at the ends with Teflon®
<br /> sheeting, capped, and labeled. The samples were stored in a cooler chilled with ice and delivered under
<br /> `r chain-of-custody procedures to Argon Laboratories(Argon) of Ceres, California.
<br /> 3.0 FIELD RESULTS
<br /> The results of the soil investigation include general field observations of procedures and soil descriptions.
<br /> 3.1 FIELD OBSERVATIONS
<br /> Field observations included direct push boring observations, photoionization detector (PID) screening
<br /> results, sample odors (if any), and visual observations of Site soils. Field observations are included on the
<br /> geological logs prepared for the borings(Appendix B).
<br /> Soils encountered in borings BI through B16 at the first sampling level of four feet bgs were
<br /> predominantly light-to-medium yellow to reddish brown silty clays. In borings B 1 through B8 the second
<br /> sampling level of nine feet generally consisted of medium-to-dark reddish brown clay with silt. No
<br /> detectable visual or olfactory indications of contamination were noted, and PID measurements of soil
<br /> samples collected from the borings indicated no detectable organic vapors.
<br /> 3.2 LABORATORY ANALYSES
<br /> The soil samples collected from the borings were composited by the laboratory at a four-to-one ratio by
<br /> equivalent depth and portion of the Site, for a total of six composite soil samples. The composite soil
<br /> samples were analyzed for total petroleum hydrocarbons (TPH) quantified as gasoline (TPH-G), diesel
<br /> (TPH-D), motor oil (TPH-M), and kerosene (TPH-K) by EPA Method 8015M; volatile organic
<br /> compounds (VOCs) by EPA Method 826013; organochlorine pesticides (OCPs) by EPA Method 8081A
<br /> and 3550B; polychlorinated biphenyls (PCBs) by Method 8082; CAM 17 metals by EPA Methods
<br /> 6010B, 3050B and 7471A; and for asbestos by Polarized Light Microscopy(PLM)methods.
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<br /> 4.0 LABORATORY ANALYTICAL RESULTS
<br /> Laboratory analytical results indicated that no petroleum hydrocarbons (TPH-G TPH-D TPH-M TPH-
<br /> K), asbestos, or VOCs were detected in any of the six composite soil samples. OCPs and PCBs were
<br /> detected at low concentrations in composite sample 4633-(9, 10, 11, 12)-4, well below hazardous levels
<br /> defined in Title 22 of the California Code Regulations. A summary of OCP and PCB results is presented
<br /> in Table 1 and a summary of CAM 17 Metals results are presented in Table 2, below. The metals barium,
<br /> chromium, cobalt, copper, nickel, vanadium, lead, and zinc were detected in all composite soil samples
<br /> collected from the 16 borings. Arsenic was detected in low concentrations in samples 4633-(1, 2, 3, 4)-4
<br /> and 4633-(13, 14, 15, 16)-4. Selenium was detected at low concentrations in sample 4633-(13, 14, 15,
<br /> 16)-4. Lead was detected at elevated concentrations in samples 4633-(1, 2, 3, 4)-4 and 4633-(9, 10, 11,
<br /> 12)-4.The only potential contaminant of concern is lead.
<br /> An elevated concentration of lead was detected in composite sample 4633-(9, 10, 11, 12)-4 at 56 mg/Kg.
<br /> This composite sample was analyzed discretely for lead. Sample 4633-10-4 had a laboratory analytical
<br /> i, result of 320 mg/Kg lead. Since this sample exceeded 50 mg/Kg lead, a soluble threshold limit
<br /> concentration (STLC) analysis was performed to determine whether this soil would be accepted by a
<br /> Class H landfill. STLC results of 15 mg/L indicated that the soil from sample 4633-10-4 exceeds STLC
<br /> levels for acceptance by a Class II landfill. A toxic concentration leaching potential (TCLP) was then run
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<br /> i/� CONDOR
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