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a <br /> ERM-West,Inc. <br /> 1777 Botelho Drive <br /> Suite 260 <br /> Walnut Creek,CA 94596 <br /> (510)946-0455 <br /> ' , (510)946-9968(Fax) <br /> RFO ;� <br /> t <br /> 7 s <br /> January 9, 1998 JAN 12 1998 <br /> EblVIRUI� WENTAL }HEALTH <br /> `- ' <br /> PERMIT / SERVICES <br /> Ms. Mary Meays <br /> Senior REHS <br /> .== San Joaquin County Public Health Services <br /> Environmental Health Division ERMm <br /> 304'East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> SUBJECT: Third Quarter Ground Water Monitoring Results <br /> 1325 and 1515 West Weber Avenue <br /> Stockton, California <br /> *- Dear Ms. Meays: <br /> On behalf of Catellus Development Corporation (Catellus), ERM-West, Inc., (ERM) is <br /> pleased to submit this letter summarizing the results of the 3rd Quarter 1997 Ground <br /> 4 _ Water Monitoring Event recently conducted at Catellus' properties at 1325 and 1515 <br /> West Weber Avenue in Stockton, California. <br /> Field activities were conducted on September 18 and September 19, 1997, and included <br /> measuring water levels and sampling the ten on-site wells (Figure 1). The field <br /> procedures are described below, followed by a discussion of the water level <br /> measurements and analytical results. <br /> FIELD PROCEDURES/OBSERVATIONS <br /> Water levels and total depths of each well were measured at approximately <br /> 7:50 am on September 18, 1997. These data, calculated ground water elevations and <br /> . purging records are presented in Attachment A. <br /> Prior to sampling, each well was systematically purged of three casing volumes using a <br /> submersible Grundfos pump. Groundwater samples were collected and placed into <br /> 't..-Y F containers appropriate for the analysis of interest(Fe+2,pH, Conductivity,Nitrate, <br /> Chloride, Dissolved Methane, Dissolved CO2, BTEX, Trimethylbenzene, TPH(g), <br /> TPH(d), Dissolved Mn). Purge records/field notes associated with the sampling event are <br /> p <br /> T` A member of the Environmental <br /> Resources Management Group <br />