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J. H. KLEINFELDER & ASSOCIATES <br /> File No. W-2030-1 <br /> September 25 , 1986 <br /> Page 3 <br /> • The collection of two soil samples; one from each <br /> terminal point of the borings. <br /> • Field screening of drill cuttings and soil samples with <br /> a photo-ionization detector (PID) for detecting the <br /> possible presence of petroleum hydrocarbons. <br /> • The chemical analysis of the soil samples for volatile <br /> aromatic hydrocarbons and carbamate and organo- <br /> phosphorous, EPA Methods 8020 , 8320 and 8140 (modified) <br /> respectively. <br /> • Preparation of a Summary Report of Findings. <br /> IV. FIELD ACTIVITIES <br /> A. Soil Boring <br /> The soil borings were drilled on August 18, 1986 . The <br /> borings were drilled using a truck-mounted Mobile B-40 drill <br /> rig equipped with 6-inch hollow stem augers. <br /> The borings were started on the northeast side of the <br /> tank and angled back toward the location of the rinsewater <br /> storage tank. The tank is approximately 10 feet long and <br /> has a diameter of approximately 7 feet. Boring B-1 was <br /> drilled 15 feet north of the center of the tank at an angle <br /> of 45 degrees from horizontal . Boring B-2 was drilled 15 <br /> feet south of the center of the tank at an angle of 45 <br /> degrees. The approximate locations of the soil sample <br /> borings are shown on Plate No. 2 . <br /> During the drilling activity, a JHK&A geologist <br /> classified the subsurface soils, collected soil samples, and <br /> logged the boreholes. Descriptions of the soil encountered <br /> are presented on Plate Nos. 4 and 5 with a copy of the <br /> Unified Soils Classification System (used to identify the <br /> soil) included as Plate No. 3 . The soils encountered in <br /> _ boreholes B-1 and B-2 consisted of silt and sand. No free <br /> water was encountered during drilling. Upon completion of <br /> the drilling and soil sampling, the boreholes were <br /> backfilled to the surface with a bentonite cement grout. <br /> B. Soil Sampling Procedure <br /> Soil samples were collected at the bottom of each boring <br /> beneath the rinsewater storage tank. The sampling intervals are <br /> shown on Plates Nos. 4 and .5. Soil samples were collected by <br />