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' Quarterly ort - June 1998 . Y Re P ' Shockey and Sons Trucking 850 Milgeo Avenue Ripon, California 1.0. INTRODUCTION ' At the request of Mr. Lee Shockey, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report for the site located at 850 Milgeo Avenue, Ripon, California(the site). The scope ' of work included ground water monitoring and the collection and analysis of ground water samples from four ground water monitoring wells. The location of the site and its surroundings are depicted in Figure 1. Monitoring wells,probe boring locations and a structure on the site are shown in Figure ' 2. Site history and findings from previous investigations and previous monitoring events at the site are ' detailed in the Preliminary Investigation and Evaluation Report- December 1996 (PIER) prepared by AGE. Monitoring and sampling procedures were performed in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division ' (PHS-EHD)and by the Central Valley Regional Water Quality Control Board (CVRWQCB)for the subsurface investigation of underground storage tank (UST) sites. 2.0. PROCEDURES ' 2.1. MONITORING WELL PURGE PROCEDURES ' On 11 June 1998, the water level in each monitoring well was measured relative to the tops of the well casings using a Solinst water level meter. The depths to ground water and relative ground water elevations are given in Table 1. ' After depth to water measurements, a two-stage submersible pump was purge used to a each well. g Eight to ten gallons of water was removed from MW-1, MW-2 and MW-3 and twenty-five gallons ' of water was removed from MW-4(minimum of three well volumes per well). The physicochemical characteristics of the ground water, temperature, pH and conductivity, were measured at regular purge-volume intervals using an ICM water analyzer. Purged water was stored on-site in 55-gallon ' DOT-approved drums. ' 2.2:- COLLECTION OF`GROUND WATER SAMPLES.- A water sample was collected from each well, using a new disposable plastic bailer, and was transferred into two 40-m1 VOA vials containing 0.5m1 hydrochloric acid (18%) as a sample Spreservative and into one 1-liter amber bottle without preservative. After collection, the samples were placed in •a chilled container,and transported under 'chain-of-custody to McCarripbell ' advanced GeoEnviron mental,Inc.