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