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r _ <br /> 1 <br /> Quarterly Report - April 1998 <br /> Shockey and Sons Trucking <br /> 850 Milgeo Avenue <br /> Ripon, California <br /> 1 <br /> 1.0. INTRODUCTION <br /> ' In accordance with the request of Mr. Lee Shockey,Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared this Quarterly Report for the site Iocated at 850 Milgeo Avenue, Ripon, California (the <br /> ' site). The scope of work included ground water well monitoring and the collection and analysis of <br /> ground water samples from four ground water monitoring wells. The location of the site and its <br /> surroundings are depicted in Figure 1-Location Map. Monitoring wells, probe boring Iocations and <br /> a structure on the site are shown in Figure 2 -Site Plan. <br /> Site history and findings from previous investigations and previous monitoring events at the site are <br /> detailed in the Preliminary Investigation and Evaluation Report- December 1996 (PIER) prepared <br /> by AGE. These details were reviewed for the proposed recommendations listed in this quarterly <br /> report. <br /> Monitoringd <br /> ansampling procedures were performed in accordance with guidelines established by <br /> the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) and <br /> the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of <br /> underground storage tank (UST) sites. <br /> 2.0. PROCEDURES <br /> ' 2.1. MONITORING WELL PURGE PROCEDURES <br /> ' On 07 April 1998, the water level in each monitoring well was measured relative to the top of the <br /> well casings using a Solinst water level meter. The depths to ground water and relative ground water <br /> elevations are given in Table 1 -Relative Ground Water Elevation Data. <br /> ' After'de th to water measurements a two-stage P , o stage submersible pump was used to purge each well. , <br /> Eight gallons'of water were removed from MW-1, MW-2 and MW-3 and twenty-one gallons of <br /> ' water were removed from MW-4 (minimum of three well volumes.per well). The physicochemical <br /> characteristics of the ground water, temperature, pH and conductivity, were measured at regular <br /> purge-volume intervals using an ICM water analyzer. Purged water was stored on-site in 55-gallon <br /> DOT-approved drums. <br /> 2.2. COLLECTION OF GROUND WATER SAMPLES <br /> A water sample was collected from each well, using a new disposable plastic bailer, and was <br /> Advanced GeoEnvironmenlal,inc. <br />