WORK PLANS - Laserfiche WebLink

Home Browse Search

GROUND ZERO ANALYSIS, INC. FIELD PROCEDURES Site Safety Plan The Site Safety Plan describes the basic safety requirements for field activities at the site. The Site Safety Plan is applicable to personnel of Ground Zero Analysis, Inc. (Ground Zero) and to subcontractors of Ground Zero. Personnel scheduled to work at the site are briefed on the contents of the Site Safety Plan before work begins. A copy of the Site Safety Plan is kept at the work site and is available for reference by appropriate parties during work at the site. The onsite representative of Ground Zero is the designated Site Safety Officer. Drilling Methods Before drilling begins, Ground Zero notifies Underground Service Alert of our intent to drill so that approximate locations of underground utility lines and structures can be marked. The soil borings are typically started by hand augering to a depth of five (5) feet to minimize the possibility of damaging underground utilities. The borings are advanced using a direct push rig (GeoProbe or equivalent) or a hollow stem auger rig equipped with continuous flight, hollow stem augers. The augers and/or rods are steam cleaned or otherwise decontaminated using the "triple rinse" method before use in each boring to minimize cross-contamination of the borings. The drill cuttings, if produced, are stored in type 17-E, 55-gallon steel drums or stockpiled onsite and covered with plastic before disposal at an appropriate facility. Logging of Borings Soil cuttings and samples are logged using the Unified Soil Classification System. The soil from at least one sleeve at each interval is placed in a sealed plastic bag. The soil vapor is then analyzed in the field using a flame ionization detector (FID) or a photoionization detector (PID) to evaluate the presence of hydrocarbon vapors in the sample. A portion of the sample is also extruded for examination of the texture, color, moisture, plasticity, and consistency of soil. The physical characteristics and subjective evidence of hydrocarbons, such as soil staining, obvious product odor, and FID/PID readings are noted in the field and on the Boring Logs. Soil Sampling in Borings Soil samples for analysis and identification are typically collected at approximately 5-foot intervals from the borings during drilling. Soil samples are collected by advancing the boring to a point just above the sampling depth and then driving a California-modified, split-spoon sampler containing clean brass sleeves through the hollow center of the auger into the soil. The sampler is driven 18 to 24 inches with a standard 140-pound hammer repeatedly dropped 30-inches. The number of blows needed to drive the sampler each successive 6-inches is counted and recorded to evaluate