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STATE OF CALIFORNIA <br /> PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL <br /> OARDCENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A ' <br /> SACRAMENTO, CA 95827-3098 <br /> FAX:PHONE: (916) -5686 00 �L Oxy '4 <br /> FAX: 916 361-5686 � <br /> a <br /> SEP 18 inn, <br /> 17 September 1991 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <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 /> We have reviewed the "Summary Report, Ground Water Monitoring and Project <br /> Conclusion/Recommendation", dated 10 July 1991, prepared by your consultant, <br /> Geological Technics. Due to the continued presence of hydrocarbon <br /> contamination in the ground water, we require at least three more quarters of <br /> ground water sampling. Quarterly reports will , therefore, be due on 15 <br /> October 1991 and 15 January and 15 April 1992. After the April 1992 report, <br /> if the ground water conditions have improved or remain unchanged, we will <br /> consider approval of the closure request and will forward a recommendation to <br /> the Executive Officer for recision of Cleanup and Abatement Order No. 90-700. <br /> In addition, the contents of our file, including reports, do not establish the <br /> status of MW-6 and the vapor extraction system. MW-6 has not been sampled <br /> since June 1990 but it was not abandoned when MW-2 and MW-4 were abandoned. <br /> We have no information on the operation of the soil vapor system, other than <br /> the fact that it was installed in the former excavation. Please submit, with <br /> your 15 October 1991 quarterly report, information on the status of MW-6 and <br /> the operation of the vapor extraction system. <br /> Copies of all reports and correspondence are also to be forwarded to San <br /> Joaquin County Public Health Services. If you have any questions, please call <br /> me at (916) 361-5726. <br /> ELIZA H A. THAYER <br /> Associate Engineer <br /> cc: Ms. Eleanor Ratliff, San Joaquin County Public Health Services, Stockton <br />