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i FILE NO. 20-3978-01.WR6 I��■ KLEINFELDER FEBRUARY 24, 1997 * Zinc [18 mg/kg to 520 mg/kg] • STLC CAM 17 Metals * Arsenic [4.9 mg/L] * Copper [1.9 mg/L] * Lead [1.9 mg/L and 58 mg/L] • TPH-D [ND(<1.0 mg/kg)] • TPH-LO [ND (Q.0 mg/kg)] • UEH [ND (<2.0 mg/kg)] • Organochlorine Pesticides and PCBs (ND, except for the following) • 4-4'-DDE [ND to 1,500 mg/kg] • 4,4'-DDT [ND to 2,700 mg/kg] • Chlorinated Herbicides(ND, except for the following) • 2,4-D [ND to 260 mg/kg] • 2,4-DB [ND to 240 mg/kg] • Semi-Volatile Organics by GUMS (ND, except for the following TICS) • Cyclo-hexanone [ND to 210 mg/kg] • Docosane [ND to 490 mg/kg] • Dodecane, 2, 7, 10-Trimethyl- [ND to 160 mg/kg] • Dodecane, 2, 7, l 1-Trimethyl- [ND to 280 mg/kg] • Eicosane [ND to 130 mg/kg] • Heptacosane [ND to 280 mg/kg] • Heptadecane, 9-Octyl- [ND to 360 mg/kg] • Octadecane, 2, 6-Dimethyl [ND to 150 mg/kg] • Tech. Chloro-phenothane [ND to 2,200 mg/kg] • Unknown(s) [ND to 2,920 mg/kg] 6.2.2 Metals Concentrations in Soils The metal analyses conducted on the soil samples collected from borings 6-1 through 6-27 yielded levels above the detection limit for arsenic, barium, cadmium,chromium,cobalt,copper, lead, mercury, molybdenum, nickel, vanadium and zinc. The soil sample analyses for all other CAM 17 metals yielded no detection. The detected metals concentrations (see Table 1) are classified as non-hazardous based on the Total Threshold Limit Concentration (TTLC) Regulated Levels expressed in §66261.24(B) of Title 22 of the California Administrative Code. The detected total concentrations do not equal or exceed 10 times the Soluble Threshold Limit Concentration (STLC) Regulated Levels which is a guideline criteria for conducting an STLC analysis, except for the 88 mg/kg of lead in the sample obtained from 6- 3 @ 0.5', the 100 mg/kg of arsenic in the sample obtained from 6-7 @ 0.5', the 340 mg/kg of copper in the sample obtained from 6-10 @ 0.5', and the 65 mg/kg of lead present in the sample obtained from 6-8 @ 0.5'. As a result of those high TTLC concentrations, those 4 soil samples were analyzed for the soluble concentrations of the same metals. All of the samples had soluble concentrations of the metals analyzed that were below the STLC Regulated Level, except, the soluble lead concentration of 58 mg/L in Boring 6-10 at 0.5 feet. That concentration was approximately an order of magnitude above the STLC Regulated Level of 5 10-3978-ol.WR61207RE074.doc Page 13 of 17 01997,Kleinjelder,Inc.