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7.0 SAMPLE COLLECTION <br /> Groundwater samples are easily obtained with a tubing bottom check valve (with a 318-inch OD Polyethylene <br /> tubing as shown in Figure 6 1), a stainless steel rum-bailer assembly, or a peristaltic pump While the check <br /> valve is the more economical sampling device, some field operators still prefer the trzditional mim-bailer or <br /> peristaltic pump <br /> NOTE: The up and down motion of the check valve may cause loss of volatile compounds from the sample To <br /> avoid volatiles loss,lower the check valve and tubing to the target monitoring zone without the check ball Drop <br /> the check ball to the bottom of tubing from the ground surface This seals the check valve and captures the <br /> sample inside the tubing without stripping away volatiles To collect the sample,simply retrieve the tubing from <br /> the well user,remove the check valve,and place the groundwater in an approved container <br /> ' 8.0 REFERENCES <br /> American Society for Testing and Materials(ASTM), 1992 ASTM D 5092 Standard Practice for Design and <br /> Installation of Ground Water Monitoring Wells in Aquifers 1993 Annual Book ofASTM Standards, Vol 0408 <br /> Philadelphia,PA <br /> American Society for Testing and Materials(ASTM), 1995 ASTM D 5521 Standard Practice for Development <br /> of Ground Water Monitoring Wells in Granular Aquifers 1996 Annual Book of ASTM Standards, Vol 0409 <br /> Philadelphia, PA <br /> Geoprobe Systems, 1997 1998-99 Tools and Equipment Catalog <br /> Geoprobe Systems, 1998 Geoprobe Prepacked Screen Monitoring Well, technical Bulletin No 96-2000,Au- <br /> gust, 1998 <br /> Equipment and tool specifications, including weights dimensions <br /> materials and operating specifications included in this brochure are <br /> subject to change without notice Where specrications are cntscal to <br /> your application please consult GeoprobeO Systems <br /> COPYRIGHT(D 1999 by Kejr Inc <br /> ALL RIGHTS RESERVED <br /> No part of this publication may be reproduced or transmitted in any <br /> form or by any means electronic or mechanical including photocopy <br /> recording or any information storage and retrieval system without <br /> permission in writing from Kejr Inc <br /> Standard Operating Procedure Page 23 1 0-in x 2 5 in OD Prepack Screen Monitoring Well <br />