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i <br /> r <br /> I <br /> As requested the following work plan addresses the items of <br /> concsrn as outlined in the; April 18 , 1991 letter from STC-EHD, <br /> items 1 through 4. <br /> t •r <br /> i VARIFICATION SAMPLING Or' TANK FIELD <br /> fit <br /> est f see Figure 3B. Depth to ground <br /> water for this site ranges from 11.71 to 12.9 at monitor well <br /> . MW1 . <br /> to <br /> r, and field screened for total volatile organic <br /> vapors usincj a HNu photoionizing detector with a 10.2 eiecton volt ` <br /> bulb. <br /> i L1Ifi <br /> 1S <br /> e <br /> for analysis of Total <br /> Petroleum Hydrocarbons Gas (TPH G) using GC FID (5030) and BTEX <br /> using method 8020 as shown on Table #2, page 17 of Tri-Regional <br /> Board Staff Recommendation August 10, 199Q. <br /> VARIFICATION SAMPLING FOR LEAD AT WASTE OIL EXCAVATED AREA <br /> ir►- = rid <br /> sing method 7421. <br /> VARIFICATION OF CONTAMINANT FREE GROUND WATER CONTALMINANT FREE <br /> DOWN GRAL7IENT OF TANK FIELD. <br /> �:��mp� �,r�►: �q����xr.,-,���„��:��IW4T) iw�ll',�ie��i�a�:����ir�r�•h�a$t;�,�,..�,f .y.:�k��� <br /> i <br /> At the <br /> time the sample is obtained monitor wells MWl, MW2 and MW3 will be <br /> gauged for depth to ground water, along with the newly installed <br /> MW4. I�lei� a �+ �F,� 3daiGBs .�t .axF2• . '.. <br /> sem, : ; cc��am �► �reer equeetdea 1 <br /> WELL CONSTRUCTION <br /> The well will be drilled under Western Geo-Engineers C-57 drilling <br /> contractors license (513857 ) using a hand auger with a 7.511 <br /> page2 <br />