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F r� WElSS ASSOCIATES Wo -Julian Munoz 5 10 June 1987 1) The sample was saturated; or 2) The sample had an OVA reading that required confirmation. Rationale for selecting samples for laboratory analysis is included in Table 1. Su__surface Geolo 'H dro eolo - is consistent between botaholes. The site is ` The subsurface geology silts and clays with occasional discontinuous underlain by low-permeability in the drilling of boring B-4 enac°entered layers of clayey sands, Debris soil in the vicinity of this borehole indicates that the upper 5 to 6 ft of occu pied the aterial from a housing development that apparently Depth Co ft below grade. ground water was may be fill mwas constructed. P site before the Safeway p les and ranged from 16.3 to 17.35 measured in the open boreho Boring lags are presented as Attachment A. OVA Suave rA in soil from all boreholes except B-1 and VOCs were detected by the OV8 detected VOCs approximately of boreholes B-2, B-7 and B- B-9. The OVA survey VOC vapor detected in boring B-2 began at the �3ter table. the boring 1 5 feet above and extended to the bottom Of 15.7 ft, where 1.8 ppm" was detected, my was detected. The OVA detected VOC vapor at 1. where 475 PP les in this boring were at 20.7 ft, while all other same B-7, 1.8 ppm, at 15.8 £t and ppmv at 15.7 ft in boring showed OVA readings o£ i.,plc;; uecection. Baring B-8 VOCs in borings B-3 and B-4 700 ppmv at the bottom of the hole at 14.7 ft. in ; in both the unsaturated and saturates 9eppmv at 20.78 ft. the were detected 28 ppmv at 15.8 ft an with OVA detected 7 ppmv at 10.8 ft, 12 pnmv was detected at 5 €t, of the borehole. In boring B-4, the the bottom at 21.7 ft at the bottom o£ 180 ppmv at 7.8 and 14.8 ft and 100 pP - boring.