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r} �J a Extended Iitvestigatton of Groundwater Quality - 152 East 11th Street, Tracy Page 2 INTRODUCTION This report documents work performed to extend investigation of the area of the subsurface affected by a release of gasoline from underground storage tanks that were formerly located on property at 152 East 11th Street, Tracy, California It documents the installation of four additional groundwater monitoring wells that were added to the existing array of wells on June 16th and 17th 1993 and presents the results of a comprehensive round of sampling of all wells at the subject property and at the Beacon Station located across the street at 153 East 11th Street that was conducted on July 8th 1993 SITE LOCATION The subject property is situated at No 152 East 11th Street, Tracy, California This location is shown on Figure 1 An area plan is presented as Figure 2 BACKGROUND The property at 152 East 11th Street was operated as a gasoline station from approximately 1946 until 1978 Over that period, the station was operated by a number of entities that included Benny's Signal Service Station, Coffey's Signal Service Station, Bob's Enco Gas Station and Terrible Herbst Inc Terrible Herbst Inc installed one 10,000 gallon and two 3,000 gallon underground storage tanks in 1972 Mr and Mrs Carl Navarra and Mr and Mrs Albert Navarra (the Navarras) purchased the property in December 1978 from the San Diego Armour Oil Company No fuel dispensing or service station operations have been conducted on the site since that time The property is now occupied by Russel's Flower Pavilion In April 1984, the three tanks described above were removed from the site under the permit and oversight of the City of Tracy No soil or groundwater samples were taken at the time the tanks were removed. PREVIOUS INVESTIGATIONS In March 1988, followmg a request from the California Regional Water Quahty Control Board - Central Valley Region (RWQCB), the Navarra% arranged for WaterWork of Sacramento, California to perform a site investigation. The mvestigation included installation of four groundwater monitoring wells These wells are shown on Figure 2 and are designated NAV 1 through NAV 4. In April 1988 WaterWork recovered samples from the wells The samples were analyzed for hydrocarbon fuel components The results of the mvestigation were reported to the RWQCB Another round of groundwater sampling from the Navarra wells was performed in January 1983 by The San Joaquin Company Inc and the results reported to the San Joaquin County Health Services, Environmental Health Division (SJCPHS) i i