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Taber Taber Consultants RECE�IV <br /> 3911 West Capitol Avenue E® <br /> West Sacramento, CA 95691-2116 <br /> (916)371-1690 MAR 2 2 2011 <br /> (707)575-1568 <br /> Fax(916)371-7265 ENVIRONMENTAL HEALTH <br /> PERMIT/SERV[cE <br /> March 18, 2011 <br /> Ms. Vickie McCartney <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202-3029 <br /> RE: MONITORED NATURAL ATTENUATION PLAN <br /> California Tank Lines <br /> 3105 South EI Dorado Street <br /> Stockton, California 95206 <br /> Dear Ms. McCartney: <br /> As proposed in our January 21, 2011 Additional Site Investigation, Updated Human Health Risk <br /> Assessment, Natural Attenuation Analysis Report to the San Joaquin County Environmental <br /> Health Department (SJCEHD), Taber Consultants and Environeering, Inc. (EI) have prepared <br /> this Corrective Action Plan letter to propose methods for assessing monitored natural <br /> attenuation for the above-referenced site. <br /> Using historical site groundwater monitoring data, Taber Consultants and EI will use the USEPA <br /> BIOSCREEN model to simulate remediation through natural attenuation of dissolved <br /> hydrocarbons in groundwater. Consistent with State Water Resources Control Board <br /> Resolution 92-49, Taber Consultants and EI will utilize the BIOSCREEN model to monitor <br /> attenuation in MW-4 and to project when Water Quality Goals will be achieved to allow site <br /> closure. <br /> Sincerely, 0tw GFO <br /> Taber Consultants THWO SAS E <br /> # No. 7299 # <br /> 7�OF CA1.�F0� <br /> Thomas E. Ballard, P.G. <br /> Senior Geologist <br /> Taber Consultants <br /> Engineers and Geologists <br />