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- <br /> a <br /> ab gal <br /> r BROWN AND CALDWELL <br /> E0 ' . <br /> CONSUI TING E NGINP f las SCrr ir'r .ter 1lrrerr E��rierrr <br /> June 24, 1987 �`�n��F?�^i1�1 _ <br /> Mr. flank SheetzMain4ALTF! <br /> ARCO tPetroleumCompany <br /> enance pProducts GNv«d�ILervisorI�TA V10ES <br /> 2000 Alameda de Las Pulgas V0,141/5tiR <br /> Post Office Box 5811 <br /> San Mateo, California 94403 017-3256-01/5 <br /> Subject: Work Completed at ARCO Service Station 2130, <br /> Stockton, California <br /> Dear Mr. Sheetz: <br /> The regular leaded gasoline underground storage tank system at ARC0 <br /> Station 2130, located at 7906 North El Dorado. Street in Stockton, <br /> California, failed a pressure test on January 16, '1987. The test <br /> was conducted by Hunter Environmental Services, Inc. The super <br /> unleaded and regular unleaded tank systems were found to b_ right. <br /> Becker Industries, Inc. (Becker) , was hired by ARCO to identify and <br /> repair the leak in the regular leaded tank system. <br /> Two shallow pits, excavated to give access to the regular leaded <br /> tank system piping, were filled with rainwater runoff (see Figure 1 <br /> enclosed) . On March 16, 1987, Brown and Caldwell (BC) personnel <br /> collected two water samples from each shallow excavation pit and <br /> submitted the samples to BC's California Department of Health <br /> Services (DHS) certified laboratory in Emeryville, California. The <br /> samples were analyzed for benzene, toluene, and xylene (BTX) , and <br /> total fuel hydrocarbons. The results of the analyses are summarized <br /> in Table 1. Complete results are enclosed. <br /> Table 1. Analytical Results: Water Samples <br /> Constituent Action levela P-NO P-90 <br /> Benzene 0.7 820 69' <br /> Toluene 100 2,400 200 <br /> Xylene-- 62g 1,100 -----9 8 0 - -- - <br /> Total fuel hydrocarbons -- 24 1.5 <br /> Note: . All measurements shown in micrograms per liter (u•3%1) . <br /> aDrinking water action levels recommended by. DHS, January 1987, <br /> bNo standard is established for total fuel hydrocarbons. <br />