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Supplemental Preliminary Site Investigation for State Route 99/Hammer Lane Project No. H202 <br /> to Mark Thomas & Co., Inc. November 17, 1999 <br /> FIELD INVESTIGATION <br /> Drilling, Sampling and Laboratory Analysis <br /> The borings were drilled using an Ingersol-Rand A400 drill rig and 8-inch diameter hollow-stem <br /> augers. Cuttings were continuously logged in accordance with USCS classification and the cuttings <br /> and samples were monitored for potential petroleum hydrocarbons utilizing a PID. Driven soil <br /> samples were obtained at approximate intervals of 5 or 10 feet. Drilling spoils were placed in steel <br /> 55-gallon drums, labeled, capped, and stored on remote portions of the sites. The borings were <br /> backfilled with a cement-bentonite grout. The augers were rinsed with a steam cleaner prior to and <br /> after each boring. The logs of the borings are presented in Figures I-1 through I-6. <br /> Soil samples were obtained using a driven 3" O.D. split-spoon sampler lined with 2.5-inch diameter <br /> by 6-inch long steel or brass tubes. Soil samples for laboratory analysis were collected by advancing <br /> the boring to the desired sampling depth, removing the auger plug, and lowering the sampler through <br /> the auger. The sampler was then driven below the auger tip (a total of 12 inches minimum) using a <br /> hydraulic driven 140-pound hammer. The lowermost(lead) tube was immediately removed from the <br /> sampling device, capped with Teflon tape and plastic end caps, then taped and sealed. The sample was <br /> labeled, logged on a chain-of-custody/sample management form, and placed in a iced cooler kept at <br /> a temperature of approximately 4°C until delivered to the laboratory for analyses. Sampling devices <br /> E were washed with a TSP or Alconox solution and rinsed in deionized water following each sampling <br /> event. <br /> I-1 <br /> `� ESPANA GEOTECHNICAL CONSULTING <br />