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®� Brown and Caldwell <br /> consultants QN, Mi IE I€TA,L K A L T H <br /> 723 5 Street PE-To rs T �"-RIIIGE <br /> Sacramento <br /> ® Califo iia 95814 7092 9w MAY 28 PM 2. 03 <br /> X916}444 0123 <br /> FAX(916) 141 8437 <br /> May 27, 1993 <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94402 017-7452-04/1 <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 /> . groundwater discharge sampling at ARCO Products Company (ARCO) Station 2133, located <br /> at 2908 Benjamin Holt Drive in Stockton, California Listed below is a summary of activities <br /> and discharge of groundwater at the site from February 16, 1993, through March 15, 1993 <br /> Table 1 presents a summary of the detected constituents for the extraction system to date <br /> (The complete laboratory report for this reporting period is included in Attachment A) <br /> 2/24/93 Collected effluent water sample for laboratory analysis of total petroleum <br /> hydrocarbons (TPH), benzene, ethylbenzene, toluene, and xylenes (BETX) <br /> 3/10/93 Collected effluent water sample for laboratory analysis of total TPH and BETX, <br /> and metals <br /> The average flow rate during this period (28 days) was approximately 3 0 gallons per minute <br /> (gpm) The average daily flow was 4,320 gallons The total volume of water discharged <br /> during the period was 124,320 gallons <br /> Table 2 presents the average pounds per day of each constituent discharged to the sanitary <br /> sewer The quantity of hydrocarbons being discharged is in compliance with the City or <br /> Stockton Wastewater Discharge Permit issued for this site The constituent quantities were <br /> calculated using the following formula <br />• <br /> 743Z\CORRESP,7452.04 LA <br />