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� -: � .• �.�3 �:sx'� Tr,:T�y'�' - `�' � ,. �-C 4:,r,'P5 rt?s^ �� gA_'- w." T ,`'_�� `�•�-��+��` mg ii'��,v 8 `��"r`<kw- �*s�Y"'f--t �.,.:��aA_ '�� .. -:�..: s.-; � � $_'�.£•.�-,t�'-� " y. br,�xs- �r� # �.-3� ,�,;A� 9T� R�; �. m�� ; �� ..�_ Mr.R. W. Conlon 2021150-4150 Ortober 9, 1990 Page 8 3.2 SVS INSTALLATION Four-inch diameter,0.020-inch machine slotted PVC wel;casing was installed horizontally beneath the foundation of the Food Mart during construction of the building at the site (Figure 5). This work was performed as a preventive measure in the event vapor abatement is needed beneath the Food Mar, building. The PVC pipe has been stubbed up in the planters on the north side of the building and can be manifolded to a SVS at a later date if need be.Figure 5 presents the locations of the pipe under the Food Mart building. 3.3 SOIL BORINGS All borings were drilled with a truck-mounted drill rig, using 8.25-inch outside diameter (O. D.), hallow-stem augers to depths between 20 and 25 feet below grade. A Groundwater Technology geologist,under the direction of a California registered geologist,supervised the drilling and maintained a continuous log of the materials encountered (Appendix 1). Soil produced by drilling operations was placed on plastic sheeting and covered. The stockpiled soil was left on site for proper disposal at a later date, pending the results of laboratory analysis. 3.4 SOIL SAMPLING Soil samples were collected during ddiling using a 2.5-inch O.D., split-spoon sampler, lined with three 2-inch diameter by 6-inch long braes sample tubes. The sampler was driven 18 incises ahead of the augers at each sample point. Samples were collected at 5-foot intervals, beginning at 5 feet beiow the ground surface to the bottom of each boring. Al', samples collected were immediately sealed, labeled, and packed on ice in an insulated container fc r delivery to a State-certified laboratory for analyses, A Chain-of-Custody manifest was main- tained wit;i the samples at all times. Copies of the Ch?in-of-Custody manifests are presented in Appendix II. Samples were analyzed for BTEX and TPH-G by modified EPA Methods 5030!802018015. In addition, samples from MW-5 were analyzed for TOG. 3.5 MONITORING WELL INSTALLATION Eleven soil borings,in which monitoring wells were installed,were drilled to an approximate depth of 40 feet below ground surface (BGS),with a truck-mounted drill rig using 125-inch O.D. hollow-stem CROUNDhATER TECHN0L0G1,INC.