SITE INFORMATION AND CORRESPONDENCE_FILE 1

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�iuuea division of ENVIRONMENTAL SOLUTIONS Emcon May 4, 1998 Project 0805440.003 Michael J. Infurna, Jr., Senior REHS San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue, Third Floor Stockton, California 95202 Re: Response to Letter Dated April 7, 1998, Regarding ARCO Facility No. 548, Located at 1612 E. Hammer Lane, Stockton, California Dear Mr. Infuma: This letter is written by Pinnacle Environmental Solutions, a division of EMCON (Pinnacle), on behalf of ARCO Products Company (ARCO), in response to your subject letter. This letter is also intended to update your agency on the status of previously proposed off-site work associated with the site. As you state in your letter, "Installation of the proposed monitoring wells in the adjacent parcel to the south of the site will require an access agreement signed by the property owner. " To date, and after several attempts to obtain access from Lincoln Properties (each item of access correspondence has been copied to your agency), we have yet to secure an executed agreement. Attempts to gain access are ongoing between ARCO and Lincoln Properties. Previous items of correspondence concerning access were forwarded to Mary Meays of your department and should be in your agency 's files. As requested, you will receive all future copies of correspondence related to obtaining access. In your letter, you also make the comment "PHS-EHD staff will conduct a field inspection during drilling activities and will determine which soil samples will be selected for analysis at the laboratory. " We will prepare workplans with specific proposed scopes of work and will submit them to your agency for review and comment/approval prior to initiating work. As the professional consultants, we provide the registered geologists and engineers which are required to oversee and conduct the proposed and approved workscopes as outlined in the Tri-Regional RWQCB guidelines in which a third-party consultant is involved in the process. We will be happy to discuss our field methods and samples to be selected for analysis and will do our best to perform this work according to the professional standards of practice for this work. However, it is also our responsibility to conduct these investigations in the most cost-effective manner possible as this saves money for both our client and the State UST reimbursement fund. We would ask that your agency also consider the practicality and SAC\N:\PJO\0805\08051400.3GS-98/pzusmeCl 3939 Cambridge Road, Suite 220 Cameron Park, California 95682 (530) 6766884 (530) 676-6885 Fax