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— , 1 <br /> 1. Y _ .. .. it ... .. f y ., ♦ ^x i — .. .!'. _,�,- <br /> ry �E <br /> i Quarterly Report March 1"997 <br /> STOCKTON PLATING _ <br /> t - 632 South El Dorado Street, Stockton, California <br /> o ' <br /> 1.0 )CNTRODUCTION <br /> Iii accordance with the request of Stockton Plating,Advanced GeoEnvironmental, Inc (AGE) has ' <br /> t prepared this Quarterly Report of ground water monitoring activities performed at 632 South E1 , <br /> Dorado Street, Stockton, California(the site) i <br />' This report details the collection of ground water and purged water samples from the site on 12 <br /> March 1997, and the installation and sampling of a ground water monitoring well on the site in <br /> April The site and its surroundings are illustrated in Figure 1 - Location Map Thee locations of <br /> structures and monitoring wells on the site are depicted in Figure 2 - Site Plan <br />' Monitoring and'sampling were performed in accordance with guidelines established by the Spin <br /> 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 <br /> storage tank (UST) sites <br /> Background information, including details of previous site assessment work, was presented in the <br /> lie March 1996 Quarterly Reports dated 05 April 1996 and in the Corrective Action Plan - December <br /> 1995, prepared by AGE <br /> E <br /> 20 PROCEDURES' <br /> 2 1 MONITORING WELL PURGING PROCEDURES 1 <br /> S <br /> 3 <br /> On 12 March 1997, a Solinst water level meter was used to measure the depth to ground water,in all <br /> monitoring wells (MW-I through MW-4) and vapor wells screened in ground water(VW-1 through <br /> VW-4) at the site The relative ground water elevation in each monitoring well and the hydraulic , <br /> gradient were determined from these data points <br /> 4 R <br /> After ground water depth measurements, a minimum of three_well volumes of water were removed <br />' from wells MW-3, MW-4 and VW-1 through VW-4 using a submersible pump Approxirnately'ten <br /> gallons of water were removed from each two-inch diameter well (MW-4 and VW-1 through VW-4) <br /> and fifty-five gallons of water were removed from well MW-3,a four-inch diameter well, stabilizing ' <br /> temperature,,pH,and conductivity Well parameters were measured at regular intervals using an ICM <br /> water analyzer Monitoring well stabilization data,and field data sheets are included in Appendix A 4 <br /> IPurged water was stored on-site in labeled 55-gallon drums <br /> } E <br /> E <br /> I <br />