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ERI <br /> ENVIRONMENTAL RESOLUTIONS, INC. <br /> May 11, 1999 <br /> ERI 227903.L16 <br /> Mr. Michael J. Infurna Jr. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Subject: Update of Environmental Investigation at Former Unocal Service Station 5098, <br /> 5606 Pacific Avenue, Stockton, California. <br /> Mr. Infurna: <br /> At the request of Union Oil Company of California (Unocal), Environmental Resolutions, Inc. (ERI) is <br /> submitting the enclosed site information to update the San Joaquin County Public Health Department, <br /> Environmental Health Division (the County) of the status of the supplemental environmental <br /> investigation at the subject site. Although drilling activities began in January 1999, the locations of <br /> proposed groundwater monitoring wells MW21S, MW21D, MW22S, and MW22D had to be moved to <br /> the Bridgestone/Firestone, Inc. (Firestone) property located at 5545 Pacific Avenue due to the presence <br /> of underground utilities beneath the former proposed well locations. The new locations of the wells are <br /> shown on the attached Generalized Site Plan. The completion of the field work was temporarily <br /> delayed while Unocal obtained an access agreement to drill at the Firestone property. <br /> Field work at the site including the installation of wells MW21S, MW21D, MW22S, and MW22D, and <br /> Hydropunch®boring HPI is scheduled to continue after business hours on May 18 through 20, 1999. <br /> Boring HPl is located in the City of Stockton right-of-way in the intersection of Robinhood Drive and <br /> Pacific Avenue as shown on the attached Generalized Site Plan. Field work and well construction will <br /> be completed in accordance with the Work Plan for Supplemental Environmental Investigation (ERI <br /> November 12, 1998) and the Addendum to Work Plan (ERI December 9, 1998) for the site. <br /> Please find enclosed a Generalized Site Plan showing the revised locations of wells MW21S, MW21D, <br /> MW22S, and MW22D, a copy of Unocal's access agreement with Firestone, a copy of the City of <br /> Stockton encroachment permit and permit extension to drill boring HPI, a permit application to drill at <br /> the Firestone property, and a check for the permit fee. <br /> i <br /> 73 Digital Drive, Suite 100, Novato, California 94949-5791 415-382-9105 (FAX 415-382-1856) <br /> Lake Forest • Novato • Seattle <br />