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Groundwater Quality Sampling Plan <br /> contracted lab so that sample bottles can be ordered in sufficient time for shipping, <br /> bottle inspection, and corrections. If any changes have been made to the site analyte <br /> list, the laboratory should be informed prior to bottle shipment. <br /> Sufficient sample bottles for each parameter group (total metals, anions, etc.)for each <br /> well will be verified upon receipt. Additional bottles for Quality Assurance/Quality Control <br /> (QAQC) samples (duplicates, trip blanks. field blanks, and/or equipment blanks)will <br /> also be arranged, as necessary, with the laboratory prior to shipment. The laboratory <br /> will also provide sample labels, chain-of-custody(COC)forms, and COC seals with <br /> delivery of the sample bottles. <br /> 4.2 Field Work Prior to Sampling <br /> Sampling personnel will inspect each well prior to sampling. The condition of the well <br /> casing, concrete pad, reference mark for water level measurements, protective steel <br /> casing, well identification markings, and security lock will be recorded. Additionally, the <br /> following will be recorded on a sampling data sheet (Appendix I)for each monitor well: <br /> • Observations made during visual inspection. <br /> • Static water level of well measured with electronic signal on measuring tape. <br /> • Total depth of the well measured or recorded from previous events. <br /> • Date and time of well measurements and well sampling <br /> • Purge water volumes calculated or rate of purging, if needed. <br /> • Observation of sample odor, presence of immiscible layers, and relative turbidity <br /> Prior to purging and groundwater sampling of any well, the static water level will be <br /> measured in the monitor well. The water levels for all the groundwater monitoring <br /> network wells will be measured on the same day or within a 36-hour period of time. In <br /> addition to the water levels, total depth will be measured annually in all wells in the <br /> monitoring network. Water level and total depth measurements will be made to the <br /> nearest 0.01 foot from a dedicated reference mark on the riser pipe using a portable <br /> electric water level indicator and will be re-measured for consistency. Depths to water <br /> will be compared in the field to previous measurements to minimize the possibility of <br /> recording incorrect readings. <br /> To avoid potential cross-contamination, the water level probe and tape will be washed <br /> before the initial use and between well locations using an AlconoxTm/water solution <br /> followed by a rinse with distilled water, or use of a disposable alcohol water swab. A pair <br /> of new disposable gloves (nitrite or latex)will be worn while performing groundwater <br /> level measurements. <br /> If the total depth measurement indicates that 25% or more of the effective screen length <br /> of a well has become filled in with sediment, the well will be re-developed. Re- <br /> 11 MOLEN&nssocrn� LG Everist Sampling Plan <br /> Page 3 of 10 <br /> 42 <br />