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i < C I t I i i Quarterly Report - February 1998 WEST CLAY PROPERTIES 639 West Clay Street, Stockton, California I , h } 1.0. INTRODUCTION �' ^ I' f 1 • I In accordance with `the request of Ms Tina Mayhew of West Clay Properties, Advanced-- GeoEnvironmental, Inc (AGE) has prepared flus Quarterly Report for the property located at 639 West Clay Street, Stockton, California Ground water monitoring was performed on 26 February 1998 The site and the surrounding area are illustrated in Figure 1-Location Afap Structures, well , Iand boring locations are illustrated on Figure 2 -Site Plan i The Quarterly Report is prepared in accordance with San Joaquin County Public Health Services - �` Environmental Health Division (PHS-EHD) and-Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines,for the investigation of underground storage tank (UST) sites J Background information is summarized in the Quarterly Monitoring Repos t and Data Summary - December 1997, prepared by AGE 2.0. PROCEDURES 21 MONITORING WELL PURGE PROCEDURES , On'26 February 1998, a Solinst water level meter was used to measure the depth to ground water in each well relative to the tops of the well casings The ground water elevations and gradient were determined from these data (Table 1) IAfter recording water level measurements, a two-stage submersible pump was used to purge each , monitoring well of standing water A minimum of three well volumes of water were removed from each well Ground water temperature,pH and conductivity were measured at regular intervals during purging using an ICM water analyzer Stabilization data and fieid'sheets are included in Appendix A Purged water was stored on-site in labeled, 55=gallon DOT-approved drums Y I J l 2 2 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each well using a riew disposable plastic bailer Each water sample was transferred'into 40-m1 VOA vials and into l-liter amber bottles `IAfter'collection, the samples were properly labeled,placed in a chilled container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI) in,Pacheco, California Each sample was analyzed for total - petroleum hydrocarbons quantified as gasoline(TPH-g)and diesel (TPH-d) in accordance with EPA ' Methods 5030/8015m,for volatile aromatics(benzene,toluene,ethyhbenzene and xylenes;BTE&X) . with methyl tertiary-butyl ether (MTBE) in accordance with:EPA Method 602 and for volatile i Advanced GeoEnvironmentai,Inc 5 r _