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Vi <br /> 9." <br /> c5' f' RC1. .-{ .. C ^IS! •M1,"�a i �' a.:r <br /> f <br /> erBrown and GaldwkA <br /> a Ccnsutants <br /> 23 S Slreel <br /> �ztrnmenz❑ <br /> y"� i,�ilorn:a5,81diD92 <br /> 070 444 0123 <br /> X 1916S.7..7 64:17 <br /> s <br /> June 17, 1991au x1 <br /> ►, 2 0 i^^i <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 017-5690111/1 <br /> San Mateo, Califomia 94402 <br /> Subject: Status of Groundwater Extraction System, ARCO Station 2133, <br /> Stockton, California <br /> Dear Mr. Carmel: <br /> This letter presents the current status of the groundwater extraction system and the results of the <br /> groundwater discharge sampling at ARCO Products Company Station 2133, located at 2908 <br /> Benjamin Holt Drive, Stockton, California. Listed chronologically below is a summary of the <br /> activities related to the discharge of groundwater at the site. <br /> 4116191 Received the discharge permit from Franey 'fucker at the City of Stockton (City), <br /> allowing discharge into the sanitary sewer. <br /> Calihmted the LEL meters and started pumping and dischaeging groundwater into the <br /> sairtary sewer. Within a few days of turning on the pumping system,the LEL meter <br /> in the well casing started shutting down the pump every few hours, due to high <br /> (greater than 10 percent) LEL readings. <br /> 4118191 COlected effluent water sample for laboratory analysis of total petroleum hydrocarbons <br /> (TPkf) and benzene,ethylbenzene,toluene, and xylenes(BEfX). Table 1 presents a <br /> summary of laboratory results of detected constituents for the extraction system. The 3 <br /> complete laboratory reports are included with this letter. F <br /> Received notice from San Joaquin County that the pumping well must be sealed at the <br /> surface. j <br /> 4125191 Extraction system was turned off. The pump was not restarting properly because the <br /> pump was plugged. The pump was withdrawn from the well,cleaned,and then placed <br /> back in the well. <br /> Called the City with preliminary laboratory results of TPH and BETX analysis. The <br /> City requested that the pump be turned on long enough to collect a sample for total <br /> toxic organics (TTO),but to leave the pump off otherwise. <br /> s <br />