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r) <br /> �, <br /> 1 11 <br /> Subsurface Investigation, Well Installation, and Sample Analyses Results Page 7 <br /> Cintra Park Phase H Development, <br /> Tract 2705, Tracy, California <br /> July 23, 1998 CTE Job No. 20-0445B <br /> feet below grade(fbg). All downhole drilling equipment was steam-cleaned and/or decontaminated <br /> with alconox and water prior to use downhole. Locations of soil borings are shown on Figure 2. <br /> F <br /> Soil samples were collected from all four borings to observe the subsurface stratigraphy and for <br /> 6 , <br /> environmental laboratory analyses in order to evaluate the horizontal and vertical extent of soil <br /> contamination b petroleum hydrocarbons.y p y s. 5011 samples were collected using a modified <br /> rCalifornia-drive sampler lined with brass sample sleeves. Both the sampler and the sleeves were <br /> Fdecontaminated prior to the collection of each sample. The steel sampler was driven into the <br /> bottom of the borehole with successive drops of a 140-pound weight falling 30 inches. Blow <br /> r <br /> counts required for sampler penetration are shown on the boring logs in the column <br /> "Blows/Foot". The soil was retained in 5-inch long brass sleeves and the sleeve ends were <br /> immediately covered with Teflon tape, sealed with plastic caps, taped, placed in ziplock bags, and <br /> laced in an ice-filled cooler. Selected samples were then transported, following P P p g appropriate <br /> chain-of-custody procedures, to the State of California Certified, Chromalab, Incorporated, <br /> analytical laboratory in Pleasanton, California, for TPH-G and BTEX analyses. Soil samples for <br /> laboratory analysis were numbered according to boring/well number and depth. Analytical results <br /> are presented in Figures 3 and 4 and Table l; these results are discussed in Section 5.L Copies of <br /> the official laboratory reports, Quality Assurance/Quality Control Reports and Chain-of-Custody <br /> F <br /> CATEEL FILESICINTRA PARKICINTRA7-13.DOC <br /> riw <br /> t <br />