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PETE WILSON, Govemor <br /> STATE OF CALIFORNIA-Environmental Protection A enc <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD S <br /> CENTRAL VALLEY REGION <br /> 43 Rouher Road,Suite A <br /> ramento,CA 95827-3098 96 NOV 21 AM 9: 39 <br /> HONE (916)255-3000IP <br /> FAX (916)255-3015 <br /> 18 November 1996 <br /> Ms Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-3420 <br /> EXXON, 4444 NORTH pERSHING AVENUE, STOCKTON, SANJOAQUIN COUNTY <br /> I reviewed the file for 4444 North Pershing, remediation estem Enclosed sa memorandum <br /> determine Waste <br /> Requirements were necessary for theproposed <br /> containing summaries of the investigation to date and the r and treatment treatiit sy system <br /> comments on the <br /> proposed system, and recommendations for the investigation <br /> My review revealed that the lateral extent of the ground water contamination has not been confirmed to <br /> the northwest of the source area If Exxon has not already tried to get permission to drill in that <br /> direction, they should be directed to do so <br /> Regarding the proposed remediation system,we require additional clarification, from EA Engineering, <br /> Science, and Technology, on the following <br /> 1 Are the two screened sections of the UVB located in zones of relatively high permeability' If <br /> not, how will this affect the circulation zone? <br /> from 2 Why are the UVB monitoring wells to be dp'aced I that foot <br /> ltrri�of the Bzone of nfluenceow will n installation <br /> 1 does <br /> of wells so close together be accomphshe <br /> not appear very cost effective the <br /> 3 Will the downgradient contamination, outsid hthiriQn zone?ion eIf so, how will it be affected increased <br /> aeration and ground water flow rates within <br /> and how will the parameters will be measured? <br /> Waste Discharge Requirements appear necessary for this remediation proposal due to the lack of <br /> hydraulic control, discharge of hydrocarbons above those listed in the General Waste Discharge <br /> Requirements for Petroleum Discharges to Land,Discharge d the <br /> hmP be submroposal toitted ed to Msischarge nChrgstme Holm, of <br /> en and <br /> phosphorus as necessary A Report of Wast <br /> this office <br /> If you have questions regarding the Report of Waste Discharge, please contact Ms Holm at (916) 255- <br /> 3064 If you have questions regarding the petroleum hydrocarbon investigation, please call me at (916) <br /> 255-3133 <br /> ELI ETH A THAYER <br /> Associate Engineer <br /> cc Ms Marla Guensler, Exxon Company, USA, Concord <br /> Mr Kyriacos Kyriacou, EA Engineering, Science, and Technology, Sacramento <br />