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IPHILIP <br /> r , y <br /> Environmental Services Group <br /> North Central Region <br /> ' February 21, 1997 <br /> 125997/7072/96 <br /> ' Ms Margaret Lagorio <br /> San Joaquin County Public Health Services <br /> Environmental Health Division- Site Mitigation Unit(EHD-SMUJ) <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> 1 Subject: QUARTERLY GROUNDWATER MONITORING <br /> AND NATURAL BIODEGRADATION ASSESSMENT REPORT <br /> Fourth Quarter 1996 <br /> ' The Earthgrains Company <br /> (formerly Rainbo Baking Company) Facility <br /> 2651 South Airport Way, Stockton, California <br /> Dear Ms Lagorio <br /> r Philip Environmental Services Corporation(Philip), is pleased to submit the following <br /> Quarterly Groundwater Monitoring And Natural Biodegradation Assessment Report for <br /> The Earthgrains Company (Earthgrains - formerly Rainbo Baking Company) facility, <br /> located at 2651 South Airport Way in Stockton, California Philip performed groundwater <br /> sampling for this quarter's event on December 16-18, 1996 <br /> In addition to the normal analysis of petroleum hydrocarbons in collected groundwater <br /> ' samples, Philip also performed an evaluation of parameters that indicates natural intrinsic <br /> biodegradation occurring within groundwater beneath the site Based on biodegradation <br /> evaluation results and the historically decreasing petroleum concentrations noted at this <br /> site, Philip recommends continued groundwater monitoring be performed at this trine in <br /> lieu of implementing an engineered remediation system Because routine quarterly <br /> monitoring has been performed since early 1992 and a large amount of resultant data has <br /> ' been accumulated, Philip requests that the monitoring schedule be reduced to semi- <br /> annually starting June 1997 <br /> ' BACKGROUND <br /> The site is a bakery products plant located at 2651 South Airport Way in Stockton, <br /> ' California(see Figure 1, Site Location Map) The plant is situated within Sections 22 and <br /> 23, Township I North, Range 6 East of the Mount Diablo Base and Meridian The site <br /> has an elevation of approximately 17 feet relative to mean sea level (MSL) <br /> y <br /> E 1121382112599714QTR96 DOC <br /> ' PHILIP ENVIRONMENTAL SERVICES CORPORATION <br /> 210 West Sand Bank Road o PO Box 230 o Columbia, IL 62236-0230 <br /> (618)281-7173 a(800)733-7173 4 Fax(618)281-5120 <br />