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• Additional Site Assessment and Feasibility Study Work Plan - June 2002 <br /> SHOCKEY AND SONS TRUCKING <br /> 850 Milgeo Avenue, Ripon, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Lee Shockey, Advanced GeoEnvironmental, Inc. (AGE) has prepared the <br /> enclosed work plan for 850 Milgeo Avenue in Ripon, California (the site). The location of the site <br /> is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. <br /> AGE proposes to install one ground water monitoring well to a depth of 30 feet bsg to characterize <br /> and delineate the lateral extent of petroleum hydrocarbon-impacted ground water at the site. <br /> Additionally, AGE proposes to install three duel-completed, 2-inch diameter ozone sparge wells <br /> (points), screened between 23 to 25 feet bsg and 38 to 40 feet bsg. Following installation of the <br /> ozone sparge wells, a 24-week ozone sparge pilot test will be performed at the site to predict a <br /> general radius of influence during ozone sparge activities and to monitor changes in ground water <br /> contamination. <br /> This work plan is prepared in accordance with California Regional Water Quality Control Board- <br /> Central Valley Region (RWQCB) guidelines for the investigation of underground storage tanks <br /> . (UST) sites. <br /> 2.0. BACKGROUND <br /> The site is located on the west side of Milgeo Avenue at the intersection of Wilma Road, adjacent to <br /> Highway 99. The site consists of two wood-frame warehouse buildings and an asphalt-paved and <br /> rock covered vehicle storage area. A former truck fueling system operated on the site for <br /> approximately 30 years. Currently a pool construction company operates a materials staging <br /> warehouse on the site. Local land use in the it unediate vicinity of the site is agricultural and industrial; <br /> residential areas are located south of the site. <br /> To date, fifteen soil borings have been advanced and four ground water monitoring wells have been <br /> installed at the site. The vertical extent of impacted soil has been defined;laterally the southern extent <br /> of impacted soil has not been defined. Impacted ground water has been defined laterally; vertically <br /> total petroleum hydrocarbons as diesel(TPH-d)was still detected at a concentration of 140 µg11 from <br /> a grab ground water sample collected at the maximum on-site boring depth of 50 feet bsg_ <br /> _ -__ —,During=the-=January=�2002-quarterly-monitoring=event;ground--water=occurred-at°=a <br />