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Ms. Mary Meays page 6 <br /> February 25, 1993 <br /> FUTURE ACTIVITIES <br /> ERM and Catellus believe that soil and groundwater contamination at Site #1 <br /> have been adequately defined, and no further investigation activities are <br /> warranted. Our rationale for the extended monitoring of both sites was to <br /> gain more information about the groundwater conditions at Site #2. We <br /> have requested extending the evaluation of remediation alternatives at both <br /> sites, if required, until Site #2 is better understood. Thus, we will be able to <br /> act on both sites, if required, in a more coordinated and cost effective manner. <br /> To assess the lateral extent of TPH-G, TPH-D and BTEX in the soils to the east <br /> and north of the tank excavation at Site #2, Catellus will conduct a limited <br /> soil and groundwater investigation. We anticipate that the soil investigation <br /> will consist of soil borings from which soil samples can be obtained and <br /> analyzed. A fifth groundwater monitoring well will also be installed further <br /> to the north of MW-1A to define the lateral extent where groundwater has <br /> been impacted by TPH-D, TPH-G and BTEX. Collectively, the five monitoring <br /> wells at Site #2 should adequately provide for the definition of a circular area <br /> of detectable constituents around the tank excavation. <br /> Shortly, Catellus will submit to you a letter which outlines the proposed <br /> scope of work to be conducted for limited soil and groundwater investigation <br /> activities at Site #2. We expect that this work will be conducted in March <br /> 1993, and will provide the necessary information to submit a Problem <br /> Assessment Report (PAR) by May 14, 1993. <br /> We appreciated the opportunity to meet with you in December. If you have <br /> any questions about this letter, please do not hesitate to contact Mr. Bruce <br /> Pfaff at the telephone number listed above. <br /> Sincerely, <br /> ERM-WEST, INC. <br /> Bruce J. Pfaff Mark P. Ransom, P.E. <br /> Project Manager Principal-in-Charge <br /> BJP/cln/1572.06 <br /> Enclosures - Noted <br /> cc: Elizabeth Thayer -- Central Valley Regional Water Quality Control Board <br />