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t <br /> ACTON + MICKELSON; 'Yoa DA1V1;ilY f:.l_T�9 <br /> Consulting Scientists, Engineers,'and ;Geologists <br /> 5090 Robert J. Mathews Parkway, #4 (916) 939-7550 <br /> El Dorado Hills, California 95762 Fax (916) 939-7570 <br /> I <br /> January 27, 1994 <br /> Mr. Randall Stephenson <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 19012.04 <br /> Subject: Soil and Ground Water Investigation--Beacon Station #474 <br /> 3440 East Main Avenue, Stockton, California <br /> Dear Mr. Stephenson: <br /> Acton * Mickelson • van Dam, Inc. (AMV), has been authorized by Ultramar Inc. to conduct <br /> •� an investigation of soil and ground water conditions at 3440 East Main Avenue, Stockton, San <br /> Joaquin County, California (Figure 1). This letter summarizes the results of soil boring, <br /> monitoring well installation, and soil and ground water sampling performed at the site on <br /> December 13 and 14, 1993. <br /> Scope of Work <br /> The work included advancing three 10-inch-diameter soil borings to a depth of approximately <br /> 90 feet below grade and completing each of the borings as 4-inch-diameter monitoring wells <br /> MW-1, MW-2, and MW-3. Monitoring well locations are illustrated on Figure 2. Methods <br /> used to drill and sample the soil borings are described in Enclosure A. Soil boring logs <br /> containing detailed descriptions of soil characteristics are included in Enclosure B. <br /> Selected soil samples were submitted for laboratory analysis of benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg). Analytical <br /> procedures conformed to U.S. Environmental Protection Agency (EPA) and California <br /> Environmental Protection Agency (Cal-EPA) approved methods. <br /> Ground water monitoring wells MW-1, MW-2, and MW-3 were constructed of 4-inch-diameter, <br /> Schedule 40 PVC casing. Details of monitoring well construction are contained in Enclosure C. <br /> Monitoring well casing risers were surveyed relative to a common bench mark. The survey <br /> notes along with monitoring well development information is contained in Enclosure D. The <br /> monitoring wells were developed, purged, and sampled in accordance with methods outlined in <br /> Enclosure A. A ground water sample from each well was submitted for laboratory analysis of <br /> BTEX and TPHg. <br /> LRPT057.ECD <br />