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Quarterly Report - December 1996 <br /> Shockey and Sons Trucking <br /> 850 Milgeo Avenue <br /> Ripon, California <br /> INTRODUCTION <br />' In accordance with the request of Mr. Lee Shockey, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared this Quarterly Report for the site located at 850 Milgeo Avenue, Ripon, California (the <br /> site). The scope of work included monitoring and sampling of four ground water monitoring wells. <br />' The location of the site and its surroundings are depicted in Figure 1- Location Map. Monitoring <br /> wells, probe boring locations and a structure on the site are shown in Figure 2 - Site Plan. Site <br />' history and findings from previous investigations and the previous monitoring event at the site are <br /> detailed in the Preliminary Investigation and Evaluation Report-August 1996 (PIER) prepared by <br /> AGE. <br />' Monitoring and sampling 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 investigation of <br /> underground storage tank (UST) sites. <br /> 2.0. PROCEDURES <br /> 2.1. MONITORING WELL PURGE PROCEDURES <br /> On 05 December 1996,the water level in each monitoring well was measured relative to the top of <br /> t it's well casings using a Solinst water level meter, The depths to ground water and relative ground <br /> water elevations are given in Table L. <br /> After depth to water measurements,a two-stage submersible pump was used to purge each well. Six <br /> gallons of water were removed from MW-1, MW-2 and MW-3 and fifteen gallons of water were <br /> removed from MW-4 (minimum of three well volumes). The ground water parameters of <br /> temperature,pH and conductivity were measured at regular intervals, using an ICM water analyzer. <br /> The ground water parameters stabilized during purging (Appendix A). Purged water was stored on- <br /> site in 55-gallon 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 /> transferred into two 40-m1 VOA vials. containing 0.5ml of 18% hydrochloric acid as a sample <br /> preservative and one 1-liter amber botte without preservative. After collection, the samples were <br /> 11 <br />