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.4 <br /> .r. <br /> j <br /> Mr. H. C. Winsor <br /> September 9, 1987 <br /> Page 7 <br /> S j <br /> Table 4. Analytical Results--Groundwater Samples <br /> Concentrations Concentrations <br /> in ug/l in mg/1 <br /> Total fuel <br /> Benzene Toluene Xylene hydrocarbons <br /> ib <br /> 0.7a <br /> Action level 100a 620a _ <br /> W-1 180 200 190 _"'c <br /> j14,000 25,000 16,000 281.7 <br /> 1 <br /> W-214,000 <br /> 23,000 15,500 227.3 <br /> i W-3 12,00 — 10 <br /> W-4 1.6 5 <br /> r 1 W_5 0.8 1.2 _ <br /> J W-6 <br /> aDrink.ng water action levels recommended by <br /> DRS, January 1987- <br /> bNo standard is established for total fuel hydrocarbons. <br /> cNondetectable. <br /> On July 20, 196T, 1.46 feet of free product was measured floating on S <br /> I the groundwater surface in Well W-2, and 1.89 feet o` free product <br /> was measured in Well W-3. No free product was measured in the other <br /> wells. On July 22, 1987, Armour Petroleum removed the fr.e product i <br /> +" in Wells W-2 and W-3 to nondetectable levels. Approximately <br /> J1l/2-gallon of product was removed from each of the two wells• The <br /> Reginnal. Board and BC agreed that BC personnel would monitor the l <br /> wOu <br /> recharge of product in the wells and that the Prwelltreached ld b8 i <br /> -1� removed. when the accumulation of product. in any <br /> . Wel! W-3 had accumulated oduct on August 3, <br /> lted 7.8 inches of pr <br /> ; <br /> inches. <br /> Regional Board and BC have agreed that product will be { <br /> ; removed from the wells on a biweekly basis until a remedial system <br /> is installed. <br /> Recommendations <br /> The May 21, 1987, Problem Assessment Report indicated that approxi <br /> fi mately. $00 gallons of unleaded gasoline was lost. This estimate was <br /> from ARCO inventory data for November . and December of 1986. <br /> 1 made. of <br /> J The amount of free product and high concent <br /> ratieo�� that daslarger <br /> - - ��— constwells- <br /> at-the stationthegapparent- <br /> yvk j volume of gasoline' was lost. Addiionaily, a <br /> of the plume- towards. Well 12 suggests the leak occurred over e <br /> longer- period of time. BC recommends :that ARCO investigate the <br /> amount of gasoline. lost'and the duration of the leak in more detail. <br /> ;f f <br />