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tp, <br /> !/ , <br /> BROWN AND CALDWELL _ <br /> June 29;" "1.989 ' <br /> CONSULTING ENGINEERS T <br /> � <br /> Mr. Larry Williams <br /> Municipal Utilities Department <br /> Regional Wastewater Control Facility <br /> 2500 Navy Drive <br /> Stockton, California 95206 017-3173-54/1 <br /> Subject: ARCO Station 2133, 2908 Benjamin Holt Drive, <br /> Stockton, California--Recovery System Water Sampling <br /> Dear=Mr:f Wi4fiams- — - - -- ---r <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 May 30, 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 (TPH) <br /> by EPA Method 8015, modified; total toxic organics by EPA. Method 625; and purgeable <br /> organics by EPA Method 624 (Table 1). j <br /> Table 1. May 30, 1989, Sample <br /> Compound, mg/l Concentration Detection limit <br /> Cadmium ND .0.02 <br /> Chromium, ND 0.02 <br /> Copper ND 0.03 <br /> Lead ND 0.05 <br /> Nickel ND 0.1 j <br /> Zinc .03 - 0.02 <br /> TPH as gasoline, mg/1 ND 0.05 <br /> Benzene, ug/1 ND 0.3 <br /> Ethylbenzene, ug/l ND 0.3 <br /> Toluene, ug/l ND 0.3 <br /> Xylene, ug/l ND 0.3 <br /> Total toxic organics, ug/1 ND --a <br /> Bisphthalate 13 -- <br /> b: <br /> 7 -- <br /> Purgeable organics, ug/1 ND <br /> ND = not detected. <br /> aThere are 74 compounds analyzed. The majority of the compounds have detection limits of <br /> 10 ug/l. The remaining compounds have detection limits less than or equal to 500 ug/l. <br /> bThere are 29 compounds analyzed. The majority of the compounds have detection limits of <br /> 10 ug/l. The remaining compounds have detection limits of 5 ug/l. <br /> 723 S STREET SACRAMENTO,CALIFORNIA 95814-7092-(916)444-0123 <br />