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,1 <br /> International Incorporated <br /> March 26, 2001 <br /> Project 077.43529.170 �' ,'; <br /> Ms. Lori Duncan <br /> MAN <br /> l{� <br /> San Joaquin County Environmental Health Division <br /> t�1 <br /> 304 East Weber Avenue, Third Floor ENVIRUtvr,r'ti „ ; ,_,tiL7N <br /> Stockton, CA 95201-0388 PER'°• !;; <br /> Re: Analytical Results for Municipal Well No. 10 <br /> Chevron Station 9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Ms. Duncan: <br /> Chevron Products Company commissioned confirmatory sampling and analysis of City of <br /> Stockton Municipal Well No. 10 on March 2, 2001. Sampling and analysis was performed <br /> in response to an unqualified detection of methyl tert butyl ether(MtBE) in this well from <br /> the 4`h quarter 2000 groundwater monitoring event. <br /> On March 2, 2001, the City of Stockton activated the disabled Municipal Well No. 10 for <br /> approximately 20 minutes. Gettler-Ryan, Inc. collected duplicate samples from the <br /> discharge piping, and prepared field blanks using de-ionized water at the site during the <br /> event. Duplicate and field blank samples were shipped to two state-certified analytical <br /> laboratories for testing of MtBE concentrations, along with trip blanks previously prepared <br /> in the laboratory. Table 1 contains the results of laboratory analysis for duplicate samples, <br /> and quality assurance samples for select analytes. Analytical reports are attached. <br /> Table 1 <br /> March 2, 2001 Analytical Results - City Of Stockton Municipal Well No. 10 <br /> Sample Description Analyzing Test Result Detection <br /> Identification Laboratory Method (ug/L) Limit(ug/L) <br /> TB-LB Trip- Laboratory Blank Sequoia8260B ND 2.5 <br /> Field Blank Field Blank Sequoia' 8260B ND 2.5 <br /> Muni-10 Municipal Well No. 10 Sequoia' 8260B ND 2.5 <br /> TB-LB Trip - Laboratory Blank Kiff? 8260B ND 0.50 <br /> Field Blank Field Blank Kiff' 8260B ND 0.50 <br /> Muni-10 Municipal Well No. 10 Kiff' 8260B 0.57 0.50 <br /> 'Sequoia Analytical 404 North Wiget Lane,Walnut Creek,California 94598 <br /> a Kiff Analytical LLC 720 Olive Drive,Suite D,Davis,California 95616 <br /> 1:1Chevron\94275\Correspondence\LD_sg_3_23_0I.doc <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861,0400 916.861.0430 Fax www.secor.com <br />