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—�" �.'ri5':, .' 'frL'}q'"',1.4_".. :'�`.�s'_ �.a' _ �'. �r *. y=_ -t "�",:'",: ..�,I. " ' f ,'F...,M,�� Z e;.:;::. =:v1 ✓ r ivy •r'- .n ,.. ; <br /> •„�.., yclEo.sao.:,.� �`- xv r,.v_I „'f,'h_ i lir � �' �zy rf t M��f '' k ^l,�— �'�y-� �,V„� �'* -w <br /> ��-+'�.+ ++x ;c..cc "� `4. a[n .yay 44.+� ,ur.,1„Y` ..';G�'{i F'm"': ��w+!si.:..415C. i�'�i� �.t���Ln.�iL�• �..�'���.r�i�'�� r�',.*. <br /> k� <br /> S, <br /> 4 <br /> O.H.S. - atoCkton Plating Inc. , <br /> 7 <br /> October1^. <br /> Page —10-- <br /> thickness of the stained layer (approx. 25 t'eet) probably <br /> Ir <br /> indicates a fluctuating groundwater table (See Stained Soil <br /> tFa <br /> Profile, Appendix A, Figures 6 and 7) . <br /> ITa <br /> r E,� 5.2 options <br /> i <br /> There are several options or combinations of options that <br /> ` 4 <br /> can be pursued at this point in the investigation. These <br /> includes (1) drill additional soil Borings, (2) install a vapor <br /> extraction system, (3) excavate the contaminated soil., and (4) <br /> t <br /> perform a groundwater investigation. Each option will be <br /> outlined and some of the benefits and/or disadvantages will be <br /> l y <br /> discussed. <br /> Option 1 <br /> a , <br /> Install 2 additional soil borings at the site to investigate <br /> the horizontal and vertical limits of the gasoline contamination <br /> around soil borings SH2 and SB3 in an effort to attain a zero <br /> detection line. The disadvantage of this option is the general <br /> lack of space required for adequate investigation of the site. <br /> Due to the proximity of the buildings and overhead utilities, <br /> additional borings would be .,-ery difficult to install. <br /> �. option 2 <br /> Ina-all a vapor extraction system to remediate the gasoline <br /> contaminated soil associated with tank site TRI-90. The system <br /> involves a number of vapor extraction wells placed around the ; <br /> v <br />