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r f � r e 3330 Data Drive Shite 100 Sacramento,CA 95670 ARIZ, 9161638.2085 Environmental FAX:916!638 83E5 Consultants,Inc. September 16, 1991 Mr.Glenn R.Dembrofl - Ultramar Inc. 525 West Third Street Hanford,California 93230 (" ;; Subject: Quarterly Monitoring Report,Second Quarter 1991 Beacon Section No.695 god Soule Cherokee lane,Lodi,California Delta Project No.40-91-831 Dear Mr.Dembroff: Delta Environmental Consultants, Inc. (Delta), has been authorized by Ultramar Inc. (Ultramar), to conduct an investigation of the ground water beneath and adjacerI to Beacon Station No.695 located at 940 South Cherokee Lane,San Joaquin County,Lodi,California. The location of the site is shown in Figure 1. The purpose of this investigation is to monitor the ground water levels and the extent and distribution of petroleum hydrocarbon constituents in the ground water beneath the site. This letter report contains the results of the quarterly ground water monitoring and sampling performed at the site. Ground water levels were measured and ground water samples were collected for analysis:jn June 19 and 28,1991. Field work conducted at the site by Delta was performed in accordance with the field methods and procedures described in Enclose: ;A. A total of 23 wells are present at the site and ground water was measured in monitoring wells MW-16, MW-18,MW-20, MW-21,MW-24,MW-25,MW-27 and recovery well RW-1,in June 1991 (fable 1). Ground water was not present in the remaining monitoring wells at the site. een approximately 65 and 69 feet below the surface during Ground water was present at the site betw the site visits in June 1991. Ground water elevation contours based on the June 19, 1991,data are illustrated in Figure 2. These contours indicate the inferred ground water flow direction is toward the southeast(Figure 2),with an average hydraulic gradient of approximately 0.007-foot per foot. Ground water level data collected from each monitoring well at the site since January 1938 is presented in Enclosure D. Ground water samples collected on June 19 and 28, 19-01,were submitted to a California-certified laboratory to determine the concentration of benzene,toluene,ethylbenzene,and xylenes(BTEX)and -- -- ... - total petroleum hydrocarbons (TPH) as gasoline using U.S. Environmental Protection Agency and Departmento.f Health-Services approved met hods:-A summary of these groundwater.sample.analytical results is presented in Table 2. A dissolved benzene concentration map based on the June 1991 ground water sample analytical results is illustrated in Figure 4. A summary of previous groundwater.analytical results, including June 1991, is presented in Enclosure C Copies of the field sampling information sheets are presented in Eir.losure D. Copies of the June 1991 ground water sample Iaboratory reports are presented in Enclosure E Delta Delivers Solutions tee► ...