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! 1 <br />{ F Quarterly Report - June 1997 <br /> •' STOCKTON PLATING _ �, r <br /> -'632 South,El Dorado Street; Stockton,'Catifornia <br /> V II <br /> 1.0. INTRODUCTION <br /> ! I <br /> , � Iti r ,1 <br /> 'In accordance with the request of Stockton Plating;Advanced GeoEnvironmental,,Inc , (AGE) has • gym <br /> prepared this Quarterly Report of ground water monitoring activities performed at 632 South El ' <br /> Dorado Street, Stocktori, California (the site) This report details the collection of ground water , <br /> t t, samples from the site on 27 June 1997 and the results of the laboratory analyses of the samples The <br /> site and its surroundings are illustrated'in Figure 1 -Localrarr A4ap The locations o£structures and ' <br /> monitoring wells onithe site are depicted in Figure 2 - Site Plan ' <br /> Monitoring and sampling were performed in accordance with guidelines established by the San <br /> f z , 'Joaquin County Public Health Services-'Environmental Health Division (PHS-EHD) and the Central ` <br /> Valley Regional,Water Quality Control Board (CVRWQCB) for,investigation of underground storage <br /> tank (UST) sites <br /> Background information, including details of previous site assessment work, was presented in the <br /> March 1996 Quarterly Reports dated 05 April 1996 and in the Cor rective Acnon,Plan —December ' <br /> r <br /> 1995, prepared by AGE <br /> 7 l 7 <br /> I 1 <br /> II ! <br /> !1 y <br /> 1 I , <br /> X2.0. - PROCEDURES' , <br /> 21 MONITORING WELL PURGING PROCEDURES <br /> M ib <br /> °Ori 27 June`1997,a Sohrist'water level meter was used to measure the'depth to ground water in all <br /> " f morutonng wells(MW through MW-4)and vapor wells screened in ground water (VW',I through <br /> VW-4)'at the site The relative ground water elevation in-each�monitonng well and the hydraulic <br /> gradient were determined from these data'points <br /> I <br /> ,� �# 1 f —>< it M ! I sf f ' ' � 1 A 1' V' -•s ' <br /> After ground water 'depth measurements, a minimum of three well volumes of water,were removed <br /> from' wells MW-3,,iMW=4 and ,MW-5 and VW-l' through VW-4?using a submersible s'pump <br /> Approximately §,to 12 gallons of water' were rem41 oved from each two-inch diameter well;(MW 4, <br /> MW-5 and VW-1 through VW-4),and 60 gallons of water we're removed'from well MW-3, a four <br /> inch diameterrwell;l+stabilizing temperature, pH, and conductivity, which,were measured at regular - <br /> intervals using an ICM water analyzer Monitoring well stabilization data and field data sheets are <br /> wincluded in Appendix A Purged water was stared on-site in labeled 55-gallon drums <br /> I Sa 1 <br />