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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 researched the location of all underground <br /> utilities using; past site construction and surveying plans and by conducting a ground <br /> reconnaissance of the area All work associated with the borings was preceded by hand augering <br /> to a minimum 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 be contaminated, were contained during the above <br /> operations These substances were retained on site until chemical testing had been completed <br /> to determine the proper means of disposal. Handling and disposal of substances known or <br /> suspected to be contaminated complied with the applicable regulations of DHS, the California <br /> Department of Water Resources, and any other applicable regulations Soils and fluids produced <br /> and/or used during the above-described operations that appeared to be contaminated were <br /> disposed of appropriately <br />