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samples. Smaller diameter push rod(s) (typically 2 inches in outer diameter, but large enough to almost completely fill the annulus of the outer push rod(s)) are advanced within the annulus of the outer push rod to the total depth. The lead inner rod serves as a soil sampler, and an acetate liner is inserted into the annulus of the lead inner rod prior to advancement. Once the soil sample is collected, the inner rod(s) and sampler are retracted and the sample tubes are removed from the sampler head. The sampler head is cleaned, filled with clean sample tubes, and the process of advancing the outer rods prior to the advancement of the sampler rods repeated until the total depth of sampling is reached. The undisturbed soil samples intended for laboratory analysis are cut away from the acetate sample liner using a hacksaw, or equivalent tool, in sections approximately 6 inches in length. The 6 inch samples are lined at each end with Teflon® sheets and capped with plastic caps. Labels documenting job number, borehole identification, collection date, and depth are affixed to each sample. The samples are then placed into an ice-filled cooler for delivery under chain- of-custody to a laboratory certified by the State of California to perform the specified tests. Groundwater Sample Acquisition, Handling, and Analysis Groundwater samples are collected from the borehole using a clean disposable plastic bailer. The groundwater sample is discharged from the bailer through a low-flow control spigot directly into laboratory provided, pre-cleaned, and chemically preserved (where appropriate) sample containers for the analyses requested. Preservatives are used in the samples if appropriate for the analyses, i.e. hydrochloric acid (HCI) for TPPH, BTEX, and fuel oxygenates by EPA Method 8260. Labels documenting sample number, well identification, collection date and time, type of sample and type of preservative (if applicable) are affixed to each sample. The samples are then placed into an ice-filled cooler for delivery under chain of custody to a certified laboratory. The type of preservative used is documented on the chain of custody form. To help assure the quality of the collected samples and to evaluate the potential for cross contamination during transport to the laboratory, a distilled-water trip blank accompanies the samples in the cooler. The trip blank is analyzed for the presence of volatile organic compounds of concern. For petroleum hydrocarbons, the trip blank is typically analyzed for TPHg, BTEX, and fuel oxygenates by EPA Method 8260. Borehole Completion Upon completion of drilling and sampling, neat cement grout, mixed at a ratio of 6 gallons of potable water per 94 pounds of Portland cement, is introduced, via a tremie pipe. Displaced groundwater is collected at the surface into DOT approved 55-gallon steel drums, or an equivalent storage container. For Direct Push boreholes, the outer drill rods are extracted as the neat cement grout is introduced into the borehole, to prevent separate groundwater bearing zones from communication. In areas where the borehole penetrates asphalt or concrete, the Stantec