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Brown and CaldwL-.,,. <br /> Consultants ' <br /> 723 5 Street <br /> Sacramento <br /> Califorria 95814-7092 <br /> 1916)444-0123 SEP <br /> FAX(916)444-8437 Ft4VIRCNMENTAL HEAL <br /> September 26, 1990 <br /> Mr. Fran Forkas <br /> Water/Wastewater Superintendent <br /> City of Lodi <br /> City Hall <br /> 221 West Pine Street <br /> Lodi,­California_ J <br /> 52741-: 017-5380-01/1 <br /> Subject: Discharge of Water From ARCO Station 434, Lodi <br /> Dear Mr. Forkas: <br /> On behalf of ARCO Products Company (ARCO), Bro n and Caldwell is requesting permission <br /> to discharge treated groundwater to the City of Lodi's ',City) sanitary sewer system. This water <br /> will be extracted and treated at ARCO Station 434 located at 501 Kettleman Lane in Lodi. <br /> When we originally made this request in March 1988, we anticipated discharging 20 to 30 <br /> gallons per minute (gpm). However, we have since installed an extraction well and our pump <br /> tests indicate we will only be capable of discharging I to 2 gpm. Therefore, we are requesting <br /> the City's permission to discharge up to 2 gpm of ireated groundwater to the City's sewer <br /> system. <br /> Specific information on ARCO's proposed discharge ii given below: <br /> Discharge rate. A maximum of 2 gpm for up to 24 hours.per day (2,880 gallons.per day, <br /> or 406 cubic feet per day). <br /> Water quality of discharge: Extracted groundwater will be treated to drinking water <br /> standards using granulated activated carbon, specifically benzene to <03 parts per billion <br /> (ppb); ethylbenzene to <680 ppb; toluene to <100 ppb; xylene to <620 ppb; and total <br /> petroleum hydrocarbons to <1 parts per million. <br /> Compliance testing: During start-up of the treatment system, Brown and Caldwell proposes <br /> to sample every day for the first five days. Continue sampling once a month for the first <br /> year. All samples will be analyzed for benzene, ethylbenzene, toluene, xylene, and total <br /> petroleum hydrocarbons. One sample from the initial start-up will be analyzed for heavy <br /> metals. There will be two carbon vessels uesed for treating the extracted water and <br /> compliance samples will be collected between the two vessels. <br />