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BLAINE _ <br /> 985 TIMOTHY DRIVE <br /> -- � <br /> TECH <br /> .LOSE CA 95133 <br /> 1 ECH SERVICES INC FAX (408) 293 8773 <br /> C_ I I <br /> i <br /> December 10, 1993 <br /> Shell Oil Company <br /> P O Box 5278 <br /> Concord, CA 94520-9998 SE `" <br /> 4 <br /> EC <br /> Attn Lynn Walker <br /> A i5 e.....�,-..._. <br /> SITE <br /> Shell WIC 9204-7524-1509 <br /> 141 N El Dorado <br /> Stockton, California <br /> QUARTER <br /> -4th quarter of 1993 <br /> QUARTERLY GROUNDWATER SAAIPLUgG REPORT 931122-L-2 <br /> This report contains data collected during routine inspection, gauging and sampling of <br /> groundwater monitoring wells performed by Blaine Tech Services, Inc in reponse to the <br /> request of the consultant who is overseeing work at this site on behalf of our mutual client <br /> Shell Oil Company Data collected in the course of our field work is presented in a <br /> TABLE OF WELL GAUGING DATA The field information was collected during our <br /> prelirmnary gauging and inspection of the wells, the subsequent evacuation of each well <br /> prior to sampling, and at the time of sampling <br /> Measurements taken include the total depth of the well and the depth to water The surface <br /> of water was further inspected for the presence of immiscibles which may be present as <br /> a thin film (a sheen on the surface of the water) or as a measurable free product zone <br /> (FPZ) At intervals during the evacuation phase, the purge water was monitored with <br /> instruments that measure electrical conductivity (EC), potential hydrogen (pH), tempera- <br /> ture (degrees Fahrenheit), and turbidity (NTU) In the interest of simplicity, fundamental <br /> information is tabulated here, while the bulk of the information is turned over directly to <br /> the consultant who is making professional interpretations and evaluations of the conditions <br /> t� at the site <br /> Hla=Tech Scmo=Inc 931122U Shell 141 N £i Domdo,Stociaon page 1 <br />