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GEOMATRIX PROTOCOL AQUIFER TESTING 1.0 INTRODUCTION This protocol describes the procedures to be followed for conducting step-drawdown, constant discharge, and slug aquifer tests and specific capacity tests. The procedures presented herein are intended to be of general use and may be supplemented by a work plan and/or health and safety plan. As the work progresses and if warranted, appropriate revisions may be made by the project manager. Detailed procedures in the protocol may be superseded by applicable regulatory requirements. A DAILY FIELD RECORD will be completed for each day of fieldwork. Weather conditions, Proximity of surface water bodies,irrigation,or other observations that may affect results of the aquifer testing will be noted on the DAILY FIELD RECORD. An AQUIFER TEST DATA FORM will be completed for each well observed during the test, during both drawdown and recovery phases. Alternatively, a data-logger may be used in each well, and the set-up parameters determined by the project hydrogeologist should be recorded on a form developed for this purpose. If a data-logger is used,data should be transferred to a computer as soon as possible after collection. As data is collected, it will be checked periodi- cally in the field for accuracy and completeness. During aquifer testing,care must be taken to contain or direct the discharged water to avoid recharge of the aquifer during the test. Water discharge from the aquifer will be collected and stored properly for future disposal by the client,unless other arrangements have been made. 2.0 STEP-DRAWDOWN TEST The step-drawdown aquifer test is performed to estimate a maximum sustainable discharge rate for the pumping well. The pretest phase,conducted prior to the aquifer test,will consist of water level measurements taken in the pumped well and observation wells that are to be moni- tored throughout the duration of the test. The water level measurements will be taken using electric sounders or pressure transducers and a data logger, and will be recorded for the appro- priate well. IADoc_Safc\PROTOCOLIPROTO-AQ 0802.doc AQUIFER TESTING REVISION DATE: March 1996 Page i of 5