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Y Brown and Caldwell <br /> Consultants <br />. 723 5 Sheet <br /> Sacramento <br /> Calrfomia 9_5814-7092 ' v P'4 1 <br /> 123 <br /> FAX(916 444 8437 <br /> J U L 1 1 <br /> NVIRONME ° rAL HEALrH <br /> July 10, 1992 PERM IVSERVJ� <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-6673-04/1 <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 <br /> . the groundwater discharge sampling at ARCO Products Company (ARCO) Station 2133, <br /> located at 2908 Benjamin Holt Drive in Stockton, Calxforma. Listed chronologically is a <br /> summary of the activities related to the discharge of groundwater at the site from April 16 <br /> through May 15, 1992 Table i presents a summary of the detected constituents for the <br /> extraction system to date (The complete laboratory reports for this reporting period are <br /> included m Attachment A) <br /> 4/22/92 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), and benzene, ethylbenzene, toluene and xylenes (BETX) <br /> 5/13/92 Calibrated LEL sensor Sample not collected because system was shut down <br /> The system was operated intermittently during the later part of this time period Although the <br /> exact cause for the nntermittant operation has not been identified, two possible causes are <br /> being investigated One is fungus growth restricting flow in the effluent piping, causing the <br /> tank to overfill. This trips the high level float switch in the tank, winch shuts the system <br /> down for approximately 1 hour before restarting automatically. The other possible cause is <br /> a maladjusted or faulty float switch either in the tank or at the pomt of discharge to the <br /> sanitary sewer <br /> The average flow rate during this period (30 days) was approximately 3 6 gallons per minute <br /> (gpm) The average daily flow was 5,184 gallons The total volume of water discharged <br /> • during the period was 155,520 gallons <br /> Table 2 presents the average pounds per day of each constituent discharged to the sanitary <br /> sewer The constituent quantities were calculated using the formula below The quantity of <br /> 6673VC0RFX%SP,6673-04 UI <br />