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May 23 , 1988 Page 5 secured with screw-on or lockings surrounded ca p nd d by a Christy box. Typical monitoring well profile is also attached to this letter, Plate 2. All wells are recorded with the Department of Water Resources - "Water Well Drillers Report" . These reports state the current owners name, location of well including a well location sketch, well construction, well tests, and subsurface soil descriptions. A copy of this report is included in our office and field files, and with the drilling company. All monitoring wells are thoroughly developed to stabilize the sand pack surrounding the screen section of the well and to free the well of silt, sand and turbidity. The development of these wells are accomplished by using a teflon hand pump. Approximately, 5 to 10 five-gallon-buckets of water is removed and/or the turbidity has subsided prior to sampling the groundwater. A TSP solution is used to wash the hand pump and later rinsed with water when used for more than one well. Sample Storage and Handling All samples are stored in our "clean" lab. They are labeled with the date of sampling, project name, project number, boring number, and depth of sample. Samples selected for laboratory testing are delivered to analytical labs the same day of sampling or within three days of the sampling date. According to EPA standards, samples must be processed and tested within the holding times set by EPA. These times vary from 48 hours to 28 days depending upon the requested test. Samples of potential contamination or of known contamination are stored in a refrigerator, (designated for this type of samples) . The temperature is kept at approximately 40° Fahrenheit. Samples are kept for approximately 20 to 30 days from the sampling date, at which time are discarded and the brass tubes and glass ware are cleaned with TSP and rinsed with water.