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A-4 <br /> 4. Stainless steel or brass soil sampling tubes were steam-cleaned or washed in TSP <br /> solution and rinsed with clean water. <br /> 5. Field monitoring equipment (pH, conductivity, or temperature probes) was rinsed with <br /> clean water prior to use and between samples. <br /> 4.0 FIELD MEASUREMENTS <br /> Field data were collected during various sampling and monitoring activities; this section <br /> describes routine procedures followed by personnel performing field measurements. The <br /> methods presented below are intended to ensure that field measurements are consistent and <br /> reproducible when performed by various individuals. <br /> 4.1 Buried Utility Locations <br /> Prior to commencement of work on site, AMV contacted appropriate utility companies to have <br /> underground utility lines located. AMV also researched the location of all underground utilities <br /> using past site construction and surveying plans and by conducting a ground reconnaissance of <br /> . the area. All work associated with the borings was preceded by hand augering to a minimum <br /> depth of 5 feet below grade to avoid contact with underground utilities. <br /> 4.2 Lithologic Logging <br /> A log of soil conditions encountered during the drilling and sample collection (Enclosure A) was <br /> maintained using the Unified Soil Classification System (Enclosure B) by an AMV geologist. <br /> All boring logs were reviewed by a California registered geologist. <br /> The collected soil samples were examined and the following information recorded: boring <br /> location, sample interval and depth, blow counts, color, soil type, moisture content (qualitative), <br /> and depth at which ground. water (if present) is first encountered. Also recorded on the soil <br /> boring logs were the field screening results derived from the use of a portable PID or FID. <br /> 4.3 Disposal Procedures <br /> Soils and fluids that were produced and/or used during the installation and sampling of borings, <br /> and that are known or suspected to contain potentially hazardous materials, were contained <br /> during the above operations. These substances were retained on site until chemical testing had <br /> been completed to determine the proper means of disposal. Handling and disposal of substances <br /> known or suspected to contain potentially hazardous materials complied with the applicable <br /> . regulations of DHS, the California Department of Water Resources, and any other applicable <br /> regulations. Soils and fluids produced and/or used during the above-described operations that <br /> appeared to contain potentially hazardous materials were disposed of appropriately. <br />