Laserfiche WebLink
ti • <br /> GROUND ZERO ANALYSIS,INC. Quality Control/Quality Assurance Plan <br /> 11.0 SOIL SAMPLING PROTOCOL <br /> 11.1 Sample Collection During Drilling Activities <br /> A proposal will be submitted to the lead Regulatory Authority with proposed boring/sampling <br /> locations. The exact location and number of borings at each site will be determined in the field by <br /> the Project Geologist/Engineer. <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 between <br /> each sample interval. <br /> Soil samples will be obtained using a California modified split-spoon sampler containing three, six <br /> inch long,two inch diameter brass tubes. The sampler will be driven 18 inches ahead of the hollow <br /> stem auger by a 140 pound hammer with a 30 inch drop in accordance with American Society for <br /> Testing and Materials (ASTM) Methods D 1586-84 for split barrel sampling of soil and D 1587-83 <br /> for thin-walled tube sampling of soils. The blows required to drive the sampler each six inch <br /> interval will be recorded on the boring log. The sampler will be removed from the boring and <br /> opened to reveal the brass tubes. One tube will be sealed with Teflon tape and plastic end caps, <br /> taped and labeled with the following information: data, time, project ID, sample ID, name of <br /> sampler and type of analysis. This sample will be immediately placed into a cooler containing dry <br /> ice or frozen chemical. A "high-low" temperature recording thermometer will accompany sample <br /> shipments to ensure proper temperature maintenance. The samples will be delivered to a state <br /> certified laboratory following under chain of custody protocol within 48 hours of sampling, <br /> whenever possible. <br /> Soil in the tubes will be described according to ASTM standard practice for description and <br /> identification of soils (ASTM D-2488-84). Stratigraphic, genetic and other data/interpretations will <br /> also be recorded. Soil properties may also be determined from the sampler shoe. These field <br /> observations will be noted 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 /> Soil samples will be collected at five foot intervals, at significant changes in lithology and intervals <br /> of obvious contamination in order to develop a complete profile of soil contamination. <br /> 11.2 Sample Collection During Tank Removal or Excavation <br /> Soil samples will collected as soon as possible after removal of the tank. Where feasible, all <br /> preparations for soil sampling will be made prior to tank removal. Soil samples collected from a <br /> backhoe bucket or directly from the excavation floor will be collected in a thin-walled stainless <br /> steel or brass cylinder at least three inches long by one inch in diameter. From 3 to 24 inches of soil <br /> will be removed from the immediate surface area where the sample is to be taken and the cylinder <br /> then pounded into the soil with a wooden mallet, bulk density driver, or other decontaminated <br /> driving device. No head space will be present in the cylinder once the sample is collected. Care <br /> will be taken to avoid contamination of both the inside and outside of the cylinder as well as its <br /> GAData\GROUNDZE\QAQC\QAQC.doc <br /> 6 <br />