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Ms. Roberta M. Kaitz Kaitz Property Services June 28, 1996 Page 3 J Groundwater was not encountered in any of the soil borings. Therefore, all direct push soil borings were grouted to the surface using neat Portland cement and bentonite mixture. Grouting was done in the presence of a SJCPHS Health Inspector. Subsurface Soil Conditions In general, soil consist of approximately 2 to 3 feet of organic-rich top soil which is composed of a moist(due to landscape irrigation), dark brown to black, silty clay(OL to CL). The top soil typically has grass rootlets and stems; it overlies approximately 3.5 feet to 4.0 feet of well compacted (engineered) fill composed of a tan, silty to sandy clay (CL). The engineered fill overlies a tan to brown clayey to silty fine sand (SC to SM) which probably formed the surface of the bottom of the oxidation ponds. Individual soil boring logs are in Attachment B. No obvious visual hydrocarbon contamination, odors, or other discolored soil was encountered in any of the soil borings. Sample Analytical Results The analyzed soil samples had no detectable total extractable petroleum hydrocarbons (TEPH) as kerosene, diesel, or motor oil. Volatile organic hydrocarbons (VOCs) were also reported below method detection limits (N.D.). Detected CCR Title 22 metals are fisted in Table 2 (Attachment Q. Antimony (Sb), beryllium(Be), cadmium(Cd), mercury(Hg), molybdenum(Mo), selenium (Se), silver(Ag), and thallium(Th)were below method detection limits or N.D. Arsenic(As)concentrations ranged from 1.7 ppm to 9.1 ppm, barium(Ba)concentrations ranged from 80 ppm to 140 ppm, chromium concentrations (Cr) ranged from 8.7 ppm to 30 ppm, cobalt concentrations ranged from 4.9 ppm to 11 ppm, copper (Cu) concentrations ranged from 10 ppm to 29 ppm, lead (Pb) concentrations ranged from 1.8 ppm to 5.9 ppm, nickel concentrations ranged from 11 ppm to 32 ppm, vanadium (V) concentrations ranged from 22ppm to 40 ppm, and zinc concentrations ranged from 23 ppm to 38 ppm. The detected metal concentrations are well below CCR Title 22 total threshold limit concentrations (TTLC)for hazardous wastes and below 10 times the soluble limit threshold concentration (STLC) for leachable metals (for a hazardous waste) as per CCR Title 22, Section 66261.24(a)(2). The detected metal concentrations also well within the ranges of natural background concentrations for soils in the United States (Table 2, Attachment Q. assa.00i\cna)mi.rpc ygienetics® Environmental