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Attachment A Page 2 4. Water sampling containers will be cleaned and prepared by the respective analytical laboratories. 5. Stainless steel or brass soil sampling tubes will be steam-cleaned or washed in TSP solution and rinsed with dean water. 6. Field monitoring equipment(pH, conductivity, or temperature probes)will be rinsed with clean water prior to use and between samples. C. FIELD MEASUREMENTS Field data will be collected during various sampling and monitoring activities;this section describes routine procedures to be 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 personnel. CA Buried Utility Locations Prior to commencement of work on site, PEM will contact appropriate utility companies to have underground utility lines located. PEM will also visually survey the site to estimate the locations of potentially unmarked underground utilities. All work associated with the borings will be preceded by hand augering to a minimum depth of 5 feet below grade to avoid damaging underground utilities. C.2 Lithologic Logging A log of soil conditions encountered during the drilling and sample collection (Enclosure A)will be maintained using the Unified Soil Classification System (Enclosure B) by a PEM geologist. All boring logs will be reviewed by California registered geologist. The collected soil samples will be 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 will be the field screening results derived from the use of a portable PID or FID(if appropriate). C.3 Disposal Procedures Soils and fluids that are produced and/or used during the installation and sampling of borings, and that are known or suspected to contain potentially hazardous materials,will be contained during the above operations. These substances will be retained on site until chemical testing has been completed to determine the proper means of disposal. Handling and disposal of substances known or suspected to contain potentially hazardous materials will comply 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 are shown to contain potentially hazardous materials will be disposed of appropriately. Residual substances generated during cleaning procedures that are known or suspected to pose a threat to human health or the environment will be placed in appropriate containers until chemical testing has been completed to determine the proper means for their disposal. CA Conductivity,Temperature,and pH Specific conductance,water temperature, and pH measurements will be made(as appropriate) when a water sample is collected. Regardless of the sample collection method,a representative water sample will be placed in transfer bottle used solely for field parameter determinations. A conventional pH meter with a combination electrode or equivalent will be used for field-specific conductance measurements. Temperature measurements will be performed using standard thermometers or equivalent temperature meters. Combination instruments capable of measuring two or all three of the parameters may also be used. All instruments will be calibrated in accordance with manufacturer's recommendations. The values for conductivity standards and pH buffers used in calibration will be recorded in field notebook. All probes will be thoroughly cleaned and rinsed with fresh water prior to any measurements, in accordance with Section C.1.