Laserfiche WebLink
.W <br /> 0 November 7000 <br /> AGF-N(' Project No. 99-0645 <br /> Page 8 of 9 <br /> =1.3. WELL DEVELOPMENT/SAMPLING <br /> Development of the proposed wells will consist of a combination of hailing with a stainless steel <br /> bailer to remove the major portion of fine-grained sediment from inside the well, surging to flush <br /> out or draw in sediment from the filter pack and additional ground water evacuation (purging) with <br /> a subrnel-sible pump to finish the removal of'lint-grained sediment. Developmental purtJing activities <br /> will be continued until field parameter(pll. electrical conductivity, and temperature) reading's have <br /> stabilised and pul-ged water is visually sediment-free. <br /> 4.4. GRO['NDWATER SAMPLING PROCEDURES <br /> GroundWater sample collection will be performed in accordance with pertinent applicable sampling <br /> protocols, details ofwdhich are presented below. <br /> 4.4.1. Static Water Level Measurements <br /> Before sampling and during quarterly oround water monitoring. static water level and free-product <br /> thickness \\ill be measured usin(21 an electric oil/water level indicator. Water level data will be <br /> recorded to the nearest 0.O1 foot from a retcrence point marked ofthe top of the PVC well casing. <br /> Before and alter each use. the electric oil/water level indicator will he washed in an Alconox solution <br /> and rinsed xvith water. <br /> ,4,2, Well Evacuation <br /> Subsequent to measurement ofdepth to water and prior to sampling, the well will be purged using <br /> a submersible pump to ensure that the ground eater sample is representative of the Iormation, rather <br /> than eater standing in the well casing. 1'he well swill be purged trntil: 1 ) a minirl�um of thr-CC casing <br /> volumes is removed from the well; and/or 2) the field-measured ground water parameters pl1. <br /> temperatr_Ire and electrical conductivity have stabilized. However, if a well is purged dry prior to <br /> evacuating three casing volumes, a ground water sample will be collected following 80 percent <br /> I'CCOV ry of ground water level within the well or within 8-11ours of well evacuation. <br /> Purge water, tree-product. and decontamirlatiori �\atcr generated during the ground eater sampi IM, <br /> activitics ,Fill be contained in DOT-approved drums which �, ill he appropriately labeled for storage. <br /> Drums containing puree vkater will he stored on-site pending appropriate removal and disposal. <br /> Idrand-edGeq)EIniruninenta1, Inc. <br />