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SOP #: GW 0001 Region I Low Stress (Low Flow) SOP Revision Number: 2 Date: July 30, 1996 Page 4 of 13 G. Indicator field pparameter monitoring instruments - pH, Eh, dissolved oxygen (DO), turbidity, specific conductance, and temperature. Use of aflow-through-cell is requfired when measuring all listed parameters, except turbidity. Standards to perform field calibration of instruments. Analytical methods are listed in 40 CFR 136, 40 CFR 141, and SW-846. For Eh measurements, follow manufacturer's instructions. H. Decontamination supplies (for example, non-phosphate detergent, distilled/deionized water, isopropyl alcohol, etc.). I. Logbook(s), and other forms (for example, well purging forms). J. Sample Bottles. K. Sample preservation supplies (as required by the analytical methods). L. Sample tags or labels. M. Well construction data, location map, field data from last sampling event. N. Well keys. 0. Site specific Sample and Analysis Plan/Quality Assurance Project Plan. P. PID or FID instrument (if appropriate) to detect VOCs for health and safety purposes, and provide qualitative field evaluations. III.PRELIMINARY SITE ACTIVITIES Check well for security damage or evidence of tampering, record pertinent observations. Lay out sheet of clean polyethylene for monitoring and sampling equipment. Remove well cap and immediately measure VOCs at the rim of the well with a PID or FID instrument and record the reading in the field logbook. If the well casing does not have a reference point (usually a V-cut or indelible mark in the well casing), make one. Describe its location and record the date of the mark in the logbook. A synoptic water level measurement round should be performed (in the shortest possible time) before any purging and sampling activities begin. It is recommended that water level depth (to 0.01 ft.) and