ASTM D6724/D6724M-16
直接推送地下水监测井安装指南

Standard Guide for Installation of Direct Push Groundwater Monitoring Wells

标准号

ASTM D6724/D6724M-16

发布

2016年

发布单位

美国材料与试验协会

当前最新

ASTM D6724/D6724M-16

 

 

引用标准

ASTM D3740 ASTM D4448 ASTM D4750 ASTM D5088 ASTM D5092 ASTM D5254 ASTM D5299 ASTM D5434 ASTM D5474 ASTM D5521 ASTM D5730 ASTM D5978 ASTM D6001 ASTM D6026 ASTM D6067 ASTM D6282 ASTM D6286 ASTM D6452 ASTM D653 ASTM D6564 ASTM D6634 ASTM D6725 ASTM D6771 ASTM D6914 ASTM D7242 ASTM D7352 ASTM D7929

适用范围

5.1 The direct push ground method is a rapid and economical procedure for installing groundwater monitoring wells to obtain representative groundwater samples and location-specific hydrogeologic measurements. Direct push installations may offer an advantage over conventional rotary drilled monitoring wells (Practice D5092) for groundwater explorations in unconsolidated formations because they reduce disturbance to the formation, and eliminate or minimize drill cuttings. At facilities where contaminated soils are present, this can reduce hazard exposure for operators, local personnel, and the environment, and can reduce investigative derived wastes. Additionally, smaller equipment can be used for installation, providing better access to constricted locations.

5.2 Direct push monitoring wells are typically smaller in diameter than drilled wells, thereby reducing purge water volumes, sampling time, and investigative derived wastes. Practice D5092 monitoring wells are used when larger diameters and/or sample volumes are required, or at depths or in geologic formations to where it is difficult to install direct push wells. Direct push monitoring wells should be viable for monitoring for many years.

5.3 Prior to construction and installation of a direct push well or any other type of groundwater well the reader should consult appropriate local agencies regarding regulatory requirements for well construction. A regulatory variance may be required for installation of direct push monitoring wells.

5.4 To date, published comparison studies between drilled monitoring wells and direct push monitoring wells have shown comparability (1-10)4. However, selection of direct push monitoring wells over conventional rotary drilled wells should be based on several criteria, such as site accessibility and penetrability, stratigraphic structure, depth to groundwater, and aquifer transmissivity.

5.5 Typical penetration depths for installation of groundwater monitoring wells with direct push equipment depend on many variables. Some of the variables are the size and type of the driving system, diameter of the drive rods and monitoring well, and the resistance of the earth materials being penetrated. Some direct push systems are capable of installing groundwater monitoring wells to depths in excess of 100 ft [30 m], and larger direct push equipment can reach depths of several hundred feet. However, installation depths of 10 to 50 ft [5 to 15 m] are most common. Direct push methods cannot be used to install monitoring wells in consolidated bedrock (for example, granite, limestone, gneiss), but are intended for installation in unconsolidated materials such as clays, silts, sands, and some gravels. Additionally, deposits containing significant cobbles and boulders (for example, some glacial deposits), or strongly cemented materials (for example, caliche) are likel......

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