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Remediation Report - 152 East 11 th Street, Tracy, California Page 23 The discovery of fuel tank fill and vent lines leading off the 152 East 11th Street property, the distribution of soil affected by hydrocarbons that was observed in the remedial excavation and the geochemical data gathered during the progress of the remediation work and from earlier site investigations support a definitive conclusion that the source of contamination that had affected the subject property was located off-site on City of Tracy property under East 11 th Street The data and observations made when the remedial excavation was open also strongly suggests that leaking underground fuel-storage tanks remain in place at that off-property location The remedial excavation opened to remove contanunated soil from the property was restored with engineered fill which was compacted such that its relative density exceeds the specifications established in the CAP A project-specific geotechnical evaluation should always be made before any construction work is undertaken but, unless deep foundations that would penetrate below the groundwater table, or some other unusual type of construction is planned, the site in its restored condition is suitable for any form of permissible redevelopment RECOMMENDATIONS A copy of this report should be submitted to the SJCPHS with a request that the property at 152 East 1 I th Street property be closed as the site of a suspected release of fuel hydrocarbons into the subsurface If the SJCPHS, after consulting with the CRWQCB, concur with this recommendation, an application should be made to the SJCPHS for a permit to seal and close monitoring wells NAV 2, 4, 5, 6, 7 and 8 which were installed to investigate groundwater quality before it was determined that the source of the contamination that had affected the subsurface beneath the site is not located on the 152 East I 1 th Street property When the monitoring wells have been closed under the permit and oversight of the SJCPHS and the requisite well-destruction records have been filed with the California Department of Water resources, the SJCPHS and the CRWQCB should be requested to issue a formal site-closure notice REFERENCES 1 California Regional Water Quality Control Board - Central Valley Region (1992) Order No 92-150___NPD1 S No CA04$2929. Waste Discharge Requirements - General from—CleanupOrder for Discharge of Ground Water o lution to ,Surface Waters (with attachments and information sheet) August 14th 1992 2 Cit of Trac 1994 9 City y { ) Ql:dtnata��]�si�_89 C.S. - An Ordinance of the Cityof_.Tracy to Amend Title 4 of Chapter 3 Article 10 to Regulate Noise bevels and to Prohibit the Making_of Disturbance, Excessive or Offensive Noises Adopted March 15th 1994