Laserfiche WebLink
Quality Assurance/Quality Control Plan Page 9 <br />Prior to arriving at the sample site, the drill rig/augers will be steam cleaned and all sample <br />equipment will be cleaned. Cleaning will be conducted on-site on all sampling equipment <br />between each sample interval. <br />Soil samples will be obtained using a California modified split -spoon sampler containing three, <br />six inch long, two inch diameter brass tubes. The sampler will be driven 18 inches ahead of the <br />hollow stem auger by a 140 pound hammer with a 30 inch drop in accordance with American <br />Society for Testing and Materials (ASTM) Methods D 1586-84 for split barrel sampling of soil <br />and D 1587-83 for thin-walled tube sampling of soils. The blows required to drive the sampler <br />each six inch interval will be recorded on the boring log. The sampler will be removed from <br />the boring and opened to reveal the brass tubes. The bottom tube will be sealed with aluminum <br />foil or teflon tape and plastic end caps, taped and labeled with the following information: date, <br />time, project ID, sample ID, name of sampler and type of analysis. This sample will be <br />immediately placed into a cooler containing dry ice or frozen chemical. A "high -low" <br />temperature recording thermometer will accompany sample shipments to ensure proper <br />temperature maintenance. The samples will be delivered to a state certified laboratory <br />following under chain -of -custody protocol within 48 hours of sampling, whenever possible. <br />Soil in the uppermost brass tube will be described according to ASTM standard practice for <br />description and identification of soils (ASTM D-2488-84). Stratigraphic, genetic and other <br />data/interpretations will also be recorded. Soil properties may also be determined from the <br />middle brass tube and from the sampler shoe. Alternatively the second sample tube may be used <br />with the uppermost tube for preparation of duplicates. These field observations will be noted <br />on a log prepared for each boring/well. <br />During sampling, latex gloves will be worn to prevent cross -contamination with other samples. <br />The disposable gloves will be discarded after collecting samples from each 18 -inch sample drive. <br />