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a <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 <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 and <br />D 1587-83 for thin-walled tube sampling of soils. The blows required to drive the sampler each six <br />inch 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 <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 steel <br />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 />G AData\GROUNDZE\QAQC\QAQC. doc <br />6 <br />