FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

11.0 SOIL SAMPLING PROTOCOL 11.1 SAMPLE COLLECTION DURING DRILLING ACTIVITIES A proposal will be submitted to the lead Regulatory Authority with proposed boring/sampling locations. The exact location and number of borings at each site will be determined in the field by the Project Geologist/Engineer. Prior to arriving at the sample site, the drill rig/augers will be steam cleaned and all sample equipment will be cleaned. Cleaning will be conducted on-site on all sampling equipment between each sample interval. Soil samples will be obtained using a California modified split -spoon sampler containing three, six inch long, two inch diameter brass tubes. The sampler will be driven 18 inches ahead of the hollow stem auger by a 140 pound hammer with a 30 inch drop in accordance with American Society for Testing and Materials (ASTM) Methods D 1586-84 for split barrel sampling of soil and D 1587-83 for thin-walled tube sampling of soils. The blows required to drive the sampler each six inch interval will be recorded on the boring log. The sampler will be removed from the boring and opened to reveal the brass tubes. One tube will be sealed with aluminum foil or teflon tape and plastic end caps, taped and labeled with the following information: data, time, project ID, sample ID, name of sampler and type of analysis. This sample will be immediately placed into a cooler containing dry ice or frozen chemical. A "high -low" temperature recording thermometer will accompany sample shipments to ensure proper temperature maintenance. The samples will be delivered to a state certified laboratory following under chain of custody protocol within 48 hours of sampling, whenever possible. Soil in the tubes will be described according to ASTM standard practice for description and identification of soils (ASTM D-2488-84). Stratigraphic, genetic and other data/interpretations will also be recorded. Soil properties may also be determined from the sampler shoe. These field observations will be noted on a log prepared for each boring/well. During sampling, latex gloves will be worn to prevent cross -contamination with other samples. The disposable gloves will be discarded after collecting samples from each 18 -inch sample drive. Soil samples will be collected at five foot intervals, at significant changes in lithology and intervals of obvious contamination in order to develop a complete profile of soil contamination. 11.2 SAMPLE COLLECTION DURING TANK REMOVAL Soil samples will collected as soon as possible after removal of the tank. Where feasible, all preparations for soil sampling will be made prior to tank removal. Soil samples collected from a backhoe bucket or directly from the excavation floor will be collected in a thin-walled stainless steel or brass cylinder at least three inches long by one inch in diameter. From 3 to 24 inches of soil will be removed from the immediate surface area where the sample is to be taken and the cylinder then pounded into the soil with a wooden mallet, bulk density driver, or other 2