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Budget Car Rental Sales Our Job P88011 Stockton, California March 14, 1988 Page 2 The soils encountered in the boring were visually classified in the field by a Field Geologist, in accordance with the Unified Soil Classification System (Figure 2) ; the boring log is presented in Figure 3 . After field classification, the soil samples were immediately sealed and refrigerated. Soil samples were obtained utilizing a 2-inch ID split spoon sampler, containing three 6 by 1.9 inch ID stainless steel tins. Upon withdrawal from the sampler, the tubes were sealed, labeled and refrigerated. The samples were then transferred to our State-certified laboratory for analysis. Chain of Custody documentation was provided for the samples. Upon completion of the boring and soil sampling, the boring was backfilled with a Health Department approved cement-sand grout. A San Joaquin County Health Department representative observed the backfilling of the boring. Subsurface Conditions The soils encountered in the boring consisted of asphalt and aggregate baserock to a depth of one foot. Underlying the Pavement section, orange-brown clayey sand was found. At five feet, dirty brown sands were encountered, grading to orange- brown/gray-brown silt at eleven feet. The silt graded to silty sand at twenty-one feet. The boring was terminated in coarse sand at twenty-six feet. Water had been expected to be encountered near twenty feet. The Log of Boring, Figure 3, should be consulted for a more detailed description of the materials encountered. The stratification lines indicated on the boring log were approximated by the field geologist. The actual transition between soils of different classification may be more gradual. Qualitative analysis was made for hydrocarbons in the field using a Photovac TIP I photoionization detector. The soil samples and cuttings were examined with the TIP for the presence of hydrocarbons. The TIP, with Span set at 5.0, detected small amounts of photo-ionizable substances from the surface to approximately seventeen feet in depth. Maximum readings were obtained between seven and fifteen feet. A faint odor of hydrocarbons was also noted between these depths. No discoloration of the soils encountered was noted. &Assocsates