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13rown and Coldweil RECEIVED <br /> HeConsuitants J U L 2 5 1991 <br /> :23 5 Street <br /> ENVIRONMENTAL HEALTH <br /> arnla j5a14-7092 <br /> X9'51444 Ot23 <br /> r-�19tCi144�-ria3i " <br /> July 19, 1991 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulbas <br /> Post Office Box 5811 017_5690-4111 <br /> San Mateo, California 94402 <br /> Subject: Status of Groundwater Extraction System,ARCO Station 2133, <br /> Stockton, California <br /> Dear Mr. Carmel: <br /> r. This letter presents the current status of the groundwater extraction system and the results of the <br /> groundwater discharge sampling at ARCO Produ+,-ts Company Station 2133, located at 2908 <br /> Benjamin Holt Drive, Stockton, Caiifocrtia. Listed chronologically below is a summary of the <br /> activities related to the discharge of groundwater at the site from?une 6 through July 15, 1991. <br /> Thi concentration,C,in the Junc 17 status letter should have been shown in mgll instead of ugA <br /> in the column heading. Also, W = 0.0042 for 0.35 gpm instead of 0 0130 as shown. The <br /> calculation results are correct as shown in the June 17 Iener. <br /> 6111191 Calibrated LEL sensors. Collected effluent water sample for laboratory analysis of <br /> total petroleum hydrocarbons(TPH)and benzene,ethylbenzene,toluene, and xylenes <br /> (BETX). Table 1 presents a summary of the detected constituents for the extraction <br /> system. <br /> 6126191 Sampled extraction system for BETX and TPH. The results of this sample are not yet <br /> available. <br /> The average daily flow during this reporting period(40 days)was approximately 10.6 gallons per <br /> mir=:.m. The total flow for this period was 610,600 gallons. <br /> V <br /> :�1 <br />