Laserfiche WebLink
.. �-:.- �.. -: -'...' "�.'.r'•c-a ,+a't�t"'."ay�� �'=�_z�: �.�-,R. �..,�, =� ��=. "�tc�� ^4 '�`'�s`k �.?ea? _ ts- 'rte` -- -�;= <br /> - � -. -}::.vt� � .�.A �� _�•-3^s �„�5-�'. ^ ate. � 3'' '� � � C ,�� ,P�" .r+�,aw'�;R �'"' „4•_ .�r. � .l��,rw`.���` ,� M. .q <br /> •'a � r ,r n�.Srs;,s s �c �� vY n <br /> � F � �� w�•r ..ti.�.�gj 1' '��. �.� _itfrx��i' .�:. _ - ��.4. #Y. ��t,.'- wk`. ,5.._ "'�v:+a �` �� sr°" � �"�1�. -2�...1 n <br /> 6 <br /> GROUNDWATEP. TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING MONITORING WELL INSTALLATION <br /> SOP 13 <br /> The boreholes for the monitoring wells shall be drilled <br /> using a truck nountesd hollow stem auger drill rig. The <br /> -- outside diameter (O.D.) sof the auger should be a minimum <br /> of eight inches when installing 4-inch wall screen. The <br /> hollow stem auger p•rovidea minimal interuptien of drill- <br /> ing while pcermitti__g soil sampling at specific intarvals. <br /> Soil samples can ba taken at desired depths by hammering <br /> a conventional split barrel sampler containing preclenned <br /> 2 inch brass sample tubes. <br /> The construction details of the monitoring wells to be <br /> drilled at the site are graphically depicted in the <br /> attn:;nea figure titled "Typical Detail of Monitoring Well <br /> Construction" (See Figure 1) . The wells should be cons- <br /> tructed sof 4 inch PVC, .020 inch machine slotted screen <br /> and blank casing. The screened portion of the well will <br /> extend 5 feet above and 10 feet below the present water <br /> table. An appropriate sand pack as determined by grain <br /> size analysis shall be placed in the annular space between <br /> the casing and drilled hole to inhibit silt buildup around <br /> the well. An annular seal installed above the sand pack <br /> should ;.onsist of bentonite pellets overlain by neat <br /> cement or cement grout to the surface. The wellhead shall <br /> be protected below grade within a traffic rated street box. <br /> Each well shall have a permanently attached identification <br /> plate containing the following .information (1) Well Number, <br /> (2) Wellhead Elevation, (3) Depth of Well, (4) Screened <br /> Interval. <br /> Subsequent to installation the wells shall be developed <br /> to remove silts and improve well performance. The well <br /> development shall be conducted by air lifting the water <br /> within the well until groundwater pumped from the wells <br /> is silt free. <br /> To assure that c.oss contamination does not occur between <br /> the drilling and development of successive wells all <br /> equipment contacting subsurface soils ox' ground water <br /> shall be stoats cleaned. The steam cleaned equipment <br /> should include but not limited to the following (1) Dril- <br /> ling Augers, (2) Split Barrel sampler, (3) Groundwater <br /> Monitoring and Sampling Equipment, (4) Well Development <br /> Piping and Sparging Equlpuent. <br /> .r. GRol,'%D%4TCR <br /> �yNUux,,1.%c <br /> s <br />