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1W & <br /> Mr. H. C. Winsor <br /> September 9, 1987 <br /> Page 7 <br /> Table 4. Analytical Results—Groundwater Samples <br /> Concentrations Concentrations <br /> in ug/1 in mg/1 <br /> `total fuel <br /> Benzene Toluene Xylene hydrocarbons <br /> Action level 0.7a 100a 620a ,...,.b <br /> W-1 180 200 190 --c <br /> W-2 14,000 25,000 16,000 281.7 <br /> W-3 12,000 23,000 15,500 227.3 <br /> W-4 1.6 --- 10 — <br /> W--5 0.88 1.22 5 w <br /> W-5 <br /> aDrinking water action levels recommended by DHS, January 1987. <br /> bio standard is established for total fuel hydrocarbons. <br /> cNondatectable. <br /> t j <br /> On July 20, 1987, 1.46 feet of free product was measured floating on <br /> the groundwater surface in Well W-2, and 1.89 feet. of free product <br /> was measured in Well W--3. No free product was measured in the other j <br /> wells. On July 22, 1987, Armour Petroleum removed the free product <br /> r in Wells W-2 and W-3 to nondetectable levels. Approximately <br /> 9 j 1/2--gallon of product was removed from each of the two wells. The <br /> Regional Board and BC agreed that BC personnel would monitor the <br /> recharge of product. in, the wells and that the. product would be <br /> E <br /> 3 removed; :when .';the acct mutation ': o£ 'groduct fn any well rear e ` 8 " <br /> s inches:- We 1 'W-3 had =a;ccumulated '7.8 inches'of product' on August 3l <br /> 3 =1987 The Regional Board and BC have agreed that product will be <br /> r► removed from the wells on a biweekly basis until a remedial system <br /> is installed. <br /> Ij Recommendations <br /> The May 21, 1987, Problem Assessment Report indicated that aiproxi- <br /> mately 800 gallons of unleaded gasoline was lost This estimate was <br /> - -_.------made from ARCO inventory data for November and December of 1956 <br /> The amount of free .product. d __high concentrations - of,,:dissolved <br /> constituents th`e wei'is at=' the':ARCO'-station suggest_ that a larger <br /> vnluae of gasoline was ;lost; I.dditionaily the`` apparent migration <br /> nf: rhe pluaae; ..tQw'arris �Teli '1a `suggests the. leak occurred ,.mover- .a' <br /> 1"ongex ;period of time:' ="BC Yeca►nmeiids that ARCO investigate the <br /> i amount nf 'gasoline`los`t and the duration of the leak in more detail. <br /> BROWN AND CALDWELL <br /> 723 5 STREET SACRAMENTO,CA 95814•IB161444.6123 - <br />