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CH2M HILL <br /> 155 Grand Avenue <br /> Suite 1000 <br /> Oakland, CA <br /> CH21VI H I LL <br /> JUL [� 94612 <br /> . p. +�V 20 AM 7: 4 1 P.O. Box 12681 <br /> Oakland, CA <br /> 94604-2681 <br /> July 17,2001 Tel 510,251,2426 <br /> Fax 510.893.8205 <br /> Dott Lofstrum <br /> San Joaquin County Public Health Services <br /> LOP/Site Mitigation Unit <br /> Environmental Health Division <br /> 304 E. Weber Ave.,Third Floor <br /> Stockton,CA 95202 <br /> Subject: March 2001 groundwater monitoring results for Disco Property,Stockton, <br /> California <br /> Dear Ms. Lofstrum: <br /> Enclosed please find the March 2001 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 /> The March 2001 sampling event was the fourth consecutive quarter of sampling all wells at <br /> the site for gasoline additives 1,2-DCA,EDB,and TBA. These compounds have never been <br /> detected in upgradient and cross-gradient monitoring wells MW-DIS-3,-4,-5,-6,-7S,-7D, <br /> -8S,-81),-9, and-10. Sampling for 1,2-DCA,EDB,and TBA in these wells will be <br /> discontinued. <br /> Monitoring wells MW-DIS-1,MW-DIS-2,NP-1-70,-80,-90,SVE-South,and SVE-North will <br /> continue to be sampled semi-annually for TPH-gas,BT6X, 1,2-DCA,and EDB. TBA has been <br /> non-detect in all wells for at least 4 quarters except SVE-North. SVE-North will continue to <br /> be sampled for TBA on a semi-annual basis. <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 /> The Second Quarter 2001 monitoring event will consist of collecting water level <br /> measurements only. <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 />