Laserfiche WebLink
U. INTRODUCTION <br /> This report presents the results of a subsurface testing program conducted at the former diesel <br /> tank and spray rack site of RMC Lonestar Kerlinger Plant located at 30350 South Tracy <br /> Boulevard in Tracy, California. The purpose of this investigation was to evaluate the extent of <br /> diesel impacted soils and to assess the potential of groundwater impact at the subject site. <br /> A. Site Background <br /> The subject site is located within the boundaries of RMC Lonestar's Kerlinger Plant at 30350 <br /> South Tracy Boulevard in Tracy, California. The plant is located east of Highway 580 at the <br /> southern edge of Tracy. The location of the subject property is graphically depicted in Figures <br /> 1 and 2 of this report. The study area is adjacent to the hot-mix asphalt loading station that <br /> formerly housed a 1,000-gallon underground diesel storage tank and a spray rack facility. The <br /> facility was used to spray diesel over truck beds to loosen asphalt residue. The spraying <br /> practice was discontinued in 1990 after the removal of the diesel tank and spray rack. <br /> Soil sampling performed during tank removal revealed diesel concentration up to 20,000 parts <br /> per million (ppm) in soils below the former storage tank pit. The San Joaquin County <br /> _ Environmental Health Division (SJCEHD) was concerned that diesel contaminated soils, <br /> resulting from past storage and spraying practices, may have impacted the groundwater of the <br /> subject property. A subsurface investigation to address SJCEHD's concern was subsequently <br /> initiated. <br /> _ B. Purpose and Scope of Work <br /> The purpose of this subsurface investigation program was to evaluate the extent of diesel <br /> impacted soils in the former underground diesel storage tank area and to assess the potential of <br /> groundwater impact from the contaminated soils. The scope of work, as outlined in AllWest's <br /> work plan, dated December 28, 1993 and approved by San Joaquin County Environmental <br /> Health Division, included the following tasks: <br /> I. Submit a work plan and obtain the permit for the drilling of five soil borings from San <br /> Joaquin County Environmental Health Division (SJCEHD). Notify SJCEHD of the <br /> pending investigation to allow agency inspection. <br /> 2. Advance five soil borings in the vicinity of the former diesel tank and spray rack area. <br /> Collect soil samples from the borings at intervals no greater than 5 feet. Maintain <br /> samples under standard chain-of-custody protocol. <br /> 3. Submit collected samples to a state certified laboratory for chemical analyses. Perform <br /> total petroleum hydrocarbons as diesel analysis (TPH-d, modified EPA method 8015) on <br /> selected soil samples. <br /> 2 <br />