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13ROWNAND CALDWELL 40' th Anniversai.), 1937-1987 <br /> CONSULTING ENGINEERS Service Excellence • EfcicnV. <br /> Jun+; 24, 1987 <br /> Mr. Hank Sheetz <br /> Maintenance Supervisor Onl, i1�AL }�EAl1� <br /> ARCO Petroleum Products Company E����RI1ilY�5ERV4CES <br /> 2000 Alameda de E,as Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94403037-3256--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 ARCO <br /> Station 2130, located at_7906 North El Dor g—S.Ueet -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 be tight. <br /> ' - Becker Industries, Inc. (Becker) , was hired by ARCO to identify and <br /> repair the leak in the regular leaded tank system. <br /> Tti;b shallow its excavated to ' <br /> p give access to the regular �.e&ded <br /> tank system piping, were filled with rainwater runoff (see Fzjur'e 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 l. . Complete results are enclosed. <br /> Table 1. Analytical Results: Water Samples <br /> Constituent Action levela P-NO P-SO <br /> Benzene 0.7 820 64 <br /> Toluene 100 2,400 200 <br /> Xylene 62g 1,100 480 <br /> Total fuel hydrocarbons - 24 1.5 <br /> Note: All measurements shown in micrograms per liter (ug/1) . <br /> 'aDrinking water action levels recommended by DHS, January 1987. <br /> No standard is established for total fuel hydrocarbons. <br /> 723SSTREET SACRAMENTO CA IJ5814•f9t61•44.61?3 - - <br />