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r <br /> BROWN AND CALDWELL <br /> CONSULTING'ENGINEERS <br /> May 8, 1989 <br /> Mr. Larry Williams <br /> Municipal Utilities Department <br /> Regional Wastewater Control Facility <br /> Stockton, California 95206 017-3173-30/1 <br /> Subject: ARCO Station 2133, 2908 Benjamin Holt Drive, <br /> Stockton, California--Recovery System Water Sampling <br /> Dear Mr. Williams: <br /> Following are the laboratory results of the latest recovery system water sampling for the <br /> subject site. The water samples were collected directly from the discharge valve between <br /> the pump and the separator tank. The sample collected April 12, 1989, was analyzed for <br /> trace metals (cadmium, chromium, copper, lead, nickel, and zinc) by EPA Method 6010, <br /> benzene, ethylbenzene, toluene, and xylene (BETX) and total petroleum hydrocarbons <br /> (TPH) by EPA Method 8015, modified. (Table 1). Volatile hydrocarbons for the April 12, <br /> 1989, sample was calculated by subtracting the BETX fraction from the TPH results. <br /> Table 1. April 12, 1989, Sample <br /> Compound, mg/l Concentration Detection limit <br /> - ----_ -Cadmium- -- - ND_____ -0.02---- <br /> Chromium ND 0.02 <br /> Copper ND 0.01 <br /> Lead ND 0.1 <br /> Nickel ND 0.1 <br /> Zinc 0.01 0.01 - <br /> TPH as gasoline, mg/1 0.3 0.1 <br /> Benzene, ug/l 30 0.5 <br /> Ethylbenzene, ug/1 2 0.5 <br /> Toluene, ug/l 11 0.5 <br /> Xylene, ug/l 22 2 <br /> i <br /> Volatile hydrocarbons, mg/1 0.24 <br /> i <br /> ND = riot detected. <br /> F <br /> . i <br /> i <br /> 723 S STREET SACRAMENTO,CALIFORNIA 95614-7092-(916)444-0123 <br /> t <br /> � I <br />