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H. KLEINFELDER & ASSOC'6rXTES Mr. Tom Vogel May 20, 1986 Page two IV. FIELD ACTIVITIES The field investigation performed at the site included soil sampling and litholog.ic logging. One exploratory- boring was drilled to a depth of 26 feet on the subject property on May 27, 1986. A Mobile B-24 skid- mounted drill rig, equipped with 6-inch diameter free flight auger, was used for the soil boring. During the drilling, a Kleinfelder geologist classified the subsurface soils, collected soil samples, and logged the borehole. A description of the soils encountered are presented on Plate No. 2 , with a copy of the Unified Soil Classification System (used to identify the soil) included as Plate No. 3 . The exploratory boring drilled at the site on May 27, 1986 was located in a previously bored hole. The previous boring V3K0_X_ was advanced to a depth of 17 feet and then, we assume, �f --� backfilled with the drill cuttings. Therefore, the soils encountered during the first 17 feet of our boring, conducted May 27, 1986, are not indicative of the surrounding soil stratification. The soils encountered beyond the 17 foot depth consisted of light yellow brown and light grey brown clay silts and silty clay. Soil samples were extracted at 20 feet and 25 feet. A 2- inch I .D. Modified Porter Sampler, containing 6-inch brass liners, was used to collect the samples. The bottom tube was covered with aluminum foil, sealed with plastic caps, and placed in an ice cooler for transport under chain-of-- custody. V. FINDINGS Soil samples were submitted to a California Certified Laboratory for analyses. The laboratory results indicate "&t----n9 petroleum hydrocarbons were detected at or above a 20 detection limit . In addition, the soils observed by our geologist in the field did not exhibit any diesel odor or fluid cut. A copy of the laboratory results are in the appendix of this report. EE