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1 APPENDIX C ' DELTA ENVIRONMENTAL FIELD METHODS AND PROCEDURES Direct Push Technology. Soil Sampling ' A well known example of direct push technology for soil sampling is the Geo robe' For the P P gY P g P purpose of this field method, the term geoprobe will be used instead of direct push technology for soil sampling The geoprobe is typically used without a drill ng The geoprobe typically consists of a sample barrel and drive casing When a soil sample is to be collected for laboratory analysis cleaned brass or stainless steel tubes of varying diameters and lengths (typically one by six inches) are used as the sample barrel The sample barrel and drive casing are simultaneously pushed, pounded or vibrated three to five feet into the soil The sample barrel containing the soil is removed and new or cleaned sample barrel is then lowered to the bottom of the boring The ' process is repeated until the desired depth is reached The soil samples are labeled and handled according to the Quality Assurance Plan The soil sample is collected, labeled, and handled ' according to the Quality Assurance Plan A geologist from Delta Environmental Consultants, Inc continuously logs (if required) each borehole using the Soil Classification Method Section during advancement and constantly checks soil samples for indications of first recognizable occurrence of groundwater A portion of the sample may be screened in the field, when required according to the Soil Sample Screening method section Soil Classification As the samples are obtained in the field, they are classified by the field geologist in accordance ' with the Unified Soil Classification System Representative portions of the samples are then retained for further examination and for verification of the field classification Logs of the borings indicating the depth and identification of the various strata, the N value, and pertinent information regarding the method of maintaining and advancing the borehole are prepared Soil Sample Screenm After the soil samples in Ziploce type bags have been brought to ambient temperature, the headspace vapors in the bag are screened with a photoionization detector equipped with a 10 2 eV ' lamp The corner of the bag is opened and the detector probe immediately placed within the headspace The highest observed reading is recorded ' QUALITY ASSURANCE PLAN General Sam le Collection and Handling Procedures ' Proper collection and handling are essential to ensure the quality of a sample Each sample 1s collected in a suitable container, preserved correctly for the intended analysis, and stored prior to ' analysis for no longer than the maximum allowable holding time Details on the procedures for collection and handling of samples used on this project can be found in this section F1Projects1701371Mastcr\WpNCIa ureIIoMficldMethodsdoc 1