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Brown and Catdwe, <br /> ConsuItant5 <br /> 23 5 Street <br /> Sacramento <br /> Calitomra 95814.7092 <br /> 19161 444-0123 <br /> FAX(916)444.8437 <br /> February 18, 1992 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017_6461-04/1 <br /> Subject: Results of Soil Vapor Extraction Pilot Test-- <br /> ARCO Station 2093, Tracy, California <br /> Dear Mr. Carmel: <br /> On December 16, 1991,Brown and Caldwell Consultants (BCC) performed a series of vapor <br /> ex=cdon pilot tests at ARCO Products Company(ARCO)Station 2093 located at 3425 Tracy <br /> Boulevard in Tracy, California. The purpose of these tests was to gatber information to <br /> determine the feasibility of designmg and construcdag a soil vapor extaacaon and treatment <br /> system at ARCO Station 2093. This report presents the results of the pilot test atdicaring(1) <br /> the. relationship between volumetric flow rates and exnacmd well vacs um, and (2) the <br /> concentrations of both gasoline-based hydrocarbons-is chlorinated compounds and organic <br /> Iead in the extracted soil vapor. This information is required to design and specify equipment <br /> used in the soil vapor extraction and treatment system. Additionally, estimates ails provided <br /> of the quantity of hydrocarbons in the soil beneath the site, and these projections are made <br /> to approximate cieaaup times. <br /> Vapor Extraction Pilot Test <br /> A test pian was submitted to the San Joaquin County Air Pollution Control District <br /> (SJCAPCD) on December 2, 1991. Written approval was granted from SJCAPCD (prior to <br /> the rest date)for BCC to perform the pilot test. During the test, soil vapor was extracted from <br /> four monitoring wells at the site using a 5-horsepower air extraction blower. Two 55-gallon <br /> drums containing granulated acavared carbon (GAC) were used to filter hydrocarbons. The <br /> GAC drums were connected in series to the exit of the vapor extraction piping in order to <br /> prevent hydrocarbon emissions. Vapors were extracted from monitoring wells ATR-2,ATR-3, <br /> ATR-4, and ATR-5. Well locations are shown on Figure 1. Wells ATR-3, ATR-4, and <br /> ATR-5 were chosen for the test because of their proximity ro the underground storage tanks <br /> and the area of known soil contamination. Well ATR-2 was selected because it is located in <br /> the upgradient portion of the plume, and soil contamination is known to exist in the capillary <br /> zone at this well. <br /> 6" t.al <br />