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STATE OF CALIFORNIA PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE AA„gmm,� <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 361-5600 <br /> FAX: (916) 361-5686 ey <br /> 4TM V <br /> 18 December 1991 DEC 2 0 1991 <br /> ENVIRONMENTAL HEALI H <br /> PERM IP SERVICuS <br /> Mr. James Wang <br /> Diamond Properties <br /> 2546 Derby Drive <br /> San Ramon, CA 94583 <br /> DIAMOND PROPERTIES (CLEANUP AND ABATEMENT ORDER NO. 90-700) , 701 WEST 11TH <br /> STREET, TRACY, SAN JOAQUIN COUNTY <br /> Thank you for submitting the "Summary Report, Ground Water Monitoring" , received <br /> 10 October 1990, which contained the quarterly monitoring results and information <br /> on MW-6 and the soil vapor extraction system as required. Quarterly sampling <br /> revealed that none of the wells contained detectable levels of hydrocarbons. It <br /> was explained that MW-6 was installed to replace MW-5, which has not yet been <br /> destroyed, and sampling of MW-6 would, therefore, be redundant. It was also <br /> explained in the report that because a large volume of soil has been excavated <br /> and the monitoring wells show little to no contamination, the soil vapor <br /> extraction system does not appear necessary at this time. <br /> Please be reminded that from my letter, dated 17 September 1991, at least two <br /> more quarterly reports are required by 15 January 1992 and 15 April 1992 and that <br /> once the reports have been submitted, the closure status will be considered at <br /> that time. If you have any questions, please call me at (916) 361-5726. <br /> ELIZA�YER . <br /> Associ2 Engineer <br /> cc: Ms. Laurie Cotulla, San Joaquin County Public Health Services, Stockton <br />