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- <br /><. <br /> .. W _ t�i�r l nnivursai 1947-1987 _._ <br /> BROWN AND CALD ELL -- - <br /> CONSULTING ENGINEERS Service • E.rccTlerrcc • Ecfc7lcy <br /> June 24, 1987 <br /> Mr. Hank Sheets d�tNTAL NEALTti! <br /> Maintenance Supervisor <br /> ARCO Petroleum Products Company E�FHSh11/SfRv1C�5 <br /> 2000 Alameda de Las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94403 017-3256-01/5 <br /> Subject: Work Completes 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 d 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 /> Two shallow pits, excavated to give access to the regular Ye' ded <br /> tank system piping, were filled with rainwater runoff (see Figu`fe 1 <br /> enclosed) . On March 16, 1987, Brown and Caldwell (BC) personnel <br /> collected two water samples from each shallow excavation pit and <br /> E 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-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 /> -TTNote: All measurements--shown in-micrograms--per-liter -(ug/-1) .---- <br /> aDrinking water action levels recommended by AHS, January 1987. <br /> - { bNo standard is established for total fuel hydrocarbons. <br /> 723S57REE1 SACHAMEN10.CA 45814 1'1401444.01:3 <br />