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�L iTALIII3330Data Drive <br /> Delt ;`i^.i,1 i'i S .if.i''I�,,� Suite 100 <br /> Rancho Cardova,CA 95670 <br /> �/- Environmental <br /> i-,� I 9161638-2085 <br /> Consultants,Inc. to i �+ � FAX:916, 8385 <br /> November 5, 1993 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Hydrogeologic Investigation <br /> Beacon Station No. 513 <br /> *At West Kettleman Lane <br /> Lodi, California <br /> Delta Project No. 40-93-942 <br /> Dear Mr. Earnest: <br /> Delta Environmental Consultants,Inc. (Delta),was authorized by Ultramar Inc. (Ultramar)to conduct <br /> a hydrogeologic investigation at Beacon Service Station No. 513, located at 41 West Kettleman Lane, <br /> Lodi, San Joaquin County, California (Figure 1). The purpose of this investigation was to assess the <br /> presence or absence of petroleum hydrocarbon constituents in soil and ground water beneath the site. <br /> Delta advanced three angle and three vertical soil borings. The three vertical soil borings were <br /> completed as ground water monitoring wells. Presented in this report is a description of various site <br /> activities and a summary of results. Work was conducted in accordance with the work plan dated <br /> August 17, 1993. <br /> Project Background Information <br /> The site is operated as a Beacon gasoline service station. There are three 12,000 gallon underground <br /> storage tanks which contain regular unleaded, plus unleaded, and premium unleaded gasoline. A soil <br /> vapor survey conducted on June 8, 1993, by Remediation Testing Design, did not detect the presence <br /> of petroleum hydrocarbons in shallow soil at the site. Results of this investigation were presented <br /> in a report dated July 1, 1993. <br /> Scope of Work <br /> The most recent drilling activities conducted on August 25-27, 30 and 31, 1993, included advancing <br /> three angle and three vertical soil borings. Soil borings SB-1, SB-2, and SB-3 were advanced to a <br /> depth of 50 feet, and were drilled at-angles of 28° or 33 ° off vertical in order to collect soil samples <br /> from beneath the tanks and pump islands. The three vertical soil borings were completed as 4-inch <br /> diameter monitoring wells, with a depth of 79 feet (MW-1, MW-2, MW-3). The monitoring well <br /> and angle boring locations are illustrated in Figure 2. The methods used to drill and sample the soil <br /> borings are included in Enclosure A. <br /> Delta Delivers Solutions <br />