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�1.Y <br />' Q Y A i Quarterly Report - June 1997 <br /> Shockey and Sons Trucking <br /> 850 Milgeo Avenue <br /> Ripon, California <br /> 1 <br /> I.O. 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 the collection and analysis of ground water <br /> samples from four ground water monitoring wells. The location of the site and its surroundings are <br /> depicted in Figure 1-Location Map. Monitoring wells, probe boring locations and a structure on the <br /> 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 /> 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 the investigation of <br /> underground storage tank (UST) sites. <br /> 2.0. PROCEDURES <br /> 2.1. WELL SURVEY _ <br /> A well survey was conducted during this quarter to gather informations regarding the location and <br /> use of municipal and domestic wells within 2000 feet of the site. Three domestic,private wells were <br /> observed within 2000 feet of the site. Casing depths ranged from 160 to 220 feet bsg. All three wells <br /> were constructed with a 50-foot bentonite sanitary seal and backfill material classified as pea gravel. <br /> Surface well seals were reported to be installed on each well. The closest well is located <br /> approximately 350 feet southeast of the site. <br /> 2.2. PURGE WATER DRUM SAMPLING PROCEDURES <br /> On 04 March 1997, the previously purged ground water at the site was sampled to determine the <br />' condition of the purged water. A sample was collected from each drum using a disposable plastic <br /> bailer, and was transferred into one 40-m1 VOA vial containing 0.5m1 of 18% hydrochloric acid as <br /> a sample preservative. After collection, the samples were placed in a chilled container and <br />' transported under chain-of custody to McCampbell Analytical, Inc., (MAI) in Pacheco, California.. <br /> Advanced GeoEnvironmental,Inc. <br />!1 <br />