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v <br /> CH2M HILL <br /> 1111 Broadway <br /> P.O.Box 12681 <br /> Oakland,CA <br /> CH2MHILL 94604-2661 <br /> Tel 510.251.2426 <br /> July 17,2000 Fax 510.893.81+"0 <br /> Ronald Rowe <br /> San Joaquin County Public Health Services �r <br /> LOP/Site Mitigation Unit o; <br /> Environmental Health Division <br /> 304 E.Weber Ave.,Third Floor <br /> Stockton,CA 95202 I <br /> I <br /> Subject: March 2000 groundwater monitoring results for Disco Property,Stockton, <br /> California <br /> Dear Mr. Rowe: <br /> Enclosed please find the March 2000 groundwater monitoring report for the Disco site. <br /> CH2M HILL is submitting this report on behalf of Del Monte. Del Monte has reviewed and <br /> approved of this report. The groundwater sample results and the groundwater flow <br /> direction continue to be consistent with previous sampling events. <br /> Due to the recent discovery of gasoline additives 1,2-DCA, EDB,and TBA in groundwater <br /> samples collected at the Disco site,groundwater samples were collected from every <br /> monitoring well at the Disco site and analyzed for 1,2-DCA, EDB, and oxygenates during <br /> this event. 1,2-DCA and EDB were detected in monitoring wells MW-DIS-1, NP-1-90', <br /> NP-1-80',NP-1-70',and SVE-South. TBA was detected in MW-DIS-1. <br /> It is recommended that all wells at the site be sampled on a quarterly basis for 1,2-DCA, <br /> EDB and TBA to assess the extent of these compounds at the site. Modifications to the <br /> sampling plan will be made after four rounds of sampling for these compounds. Monitoring <br /> wells MW-DIS-1,MW-DIS-2,NP-1-70,-80, -90,SVE-South,and SVE-North will continue to <br /> be sampled semi-annually for TPH-gas, BTEX, 1,2-DCA,EDB, and TBA. <br /> Note: In order to continue the accurate assessment of the groundwater flow direction, <br /> water level measurements in all wells, and evaluation of the groundwater gradient will <br /> continue to be performed on a quarterly basis. <br /> If you have any questions or comments please feel free to call me at (510) 251-2888 ext. 2101, <br /> or Richard Fish at 925-944-7276. <br /> i <br />