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VE <br /> BLAINE SAN <br /> 1CA 9513, <br /> TECH <br /> JOSE CA 9513 <br /> (408) 995-553E <br /> TECH SERVICES INC FAX (408) 293-877- <br /> RECEIVED <br /> May 3, 1993 <br /> MAY f 4 1999 <br /> Ansd...r:,::�/� <br /> Shell Oil Company <br /> P O Box 5278 <br /> Concord, CA 94520-9998 <br /> Attn Daniel T Kirk <br /> srrE <br /> Shell WIC#204-7524-2408 <br /> 4445 Pershing Avenue <br /> Stockton, California <br /> QL ARTER <br /> 2nd quarter of 1993 <br /> QUARTERLY GROUNDWATER SAMPLING REPORT 930428-Y-2 <br /> This report contains data collected dunng routine inspection, gauging and sampling of <br /> groundwater monitoring wells performed by Blaine Tech Services, Inc in response 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 /> preliminary 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 the 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 /> at the site. <br /> Hlsane Tech Services,Inc. 936428-Y-2 Shell 4445 Pershing,Suxkl n page 1 <br />