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_`_ --i <br />^ � <br /> -� �A '.. `��' � +� � u�'�.. ��R `'�, � - �x3�a-ter` '}s"' - �,;y —`4.,,.;;1_ ., ��_,.'�'4 � �` '£w`;�^'�;.a-w^��.a. �. .s,si ��.+. r�, 'd< 'it�!n+�'':,.vtab�� rt�" ^�,..�w,,�; ^a`�,'.�'c ;� �»p�»�,�°�' r, �n.a� -"'K�.°7 '� ����',���`,�••li�br. .��' �»� <br /> �' u -yi-"y'.,.q{•.'�1. d'; y�?z _... N 4 ...o-i .� ...�- 1e'.� �_~��'13;` ..t .�✓ ��9'. "� ew,�J� f!✓:w :1T T�a;�, 'fA�� �:.. �. <br />_ s <br /> w <br /> April 7, 1992 <br /> ` ARCO Station No. 2168, Stockton, California <br /> extraction wells based on PID readings. <br /> o Drill one 8-inch-diameter soil boring near the waste-oil tank cavity. If odor <br /> or soil discoloration is noted in soil within 10 feet of ground water, the boring <br /> .1 l0-inch-diameter boring and converted to a 4-inch- <br /> may be reamed to <br /> diameter ground-water monitoring well. <br /> o Drill three l0 inch-diameter soil borings to 10 feet below ground water <br /> (approximately 55 feet below grade) or 5 feet into the first aquitard and <br /> convert the bonngs into ground-water monitoring wells. The proposed <br /> Im locations of soil borings and ground-water/vapor-extraction <br /> wells are shown <br /> MOM on Plate :. <br /> o Collect relatively undisturbed soil samples at 5-foot intervals or lithological <br /> changes from the ground surface to the total depth of each boring. Soil <br /> e and maintained at 4 degrees centigrade <br /> samples will be placed in iced storag <br /> for transport to the analytical laboratory. <br /> sample the ground-water monitoring wells. <br /> o Develop, purge, and <br /> aproved by <br /> laboratory <br /> o Submit water and,app;lbe selected in ae soil nattempts to ato delineatehvcrocarbons <br /> ARCO. Sell samples <br /> vertically. <br /> o Soil and water samples were analyzed for total petroleum hydrocarbons as <br /> tal Protection Agency (EPA) preparation <br /> gasoline (TPHg) u;:ing Environmen <br /> Method 5030 and modified EPA Method 8015 and benzene, toluene, <br /> ethylbenzene, and total xylene isomers (BTEX) using EPA Method 8020. <br /> -o <br /> Samples collected neer the waste it <br /> tank will be analyzed for compounds <br /> recommended in the SICPHS-EHD guidelines. Sail samples from the borings <br /> having the highest reading on the PID will be analyzed for total lead using <br /> EPA Method 7421. If total lead is detected, we will discuss with ARCO the <br /> submittal of additional soil samples to delineate total lead in soil. <br /> o Contract a licensed surveyor to survey the wells with respect to mean sea <br /> level. <br /> o Evaluate the ground-water gradient beneath the site. <br /> 3 <br /> 31009.1 W <br />