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Mr. Alan Bell <br /> December 31 , 1991 <br /> Page 2 <br /> the limited scope of this condition. The Corcoran clay was <br /> identified in the Report as separating the upper and lower <br /> aquifer beneath the site and preventing hydraulic connection. We <br /> are concerned that the construction of onsite wells to utilize <br /> the lower aquifer could potentially compromise the integrity of <br /> the barrier between the aquifers. Therefore, the Department' s <br /> letter referenced the Corcoran clay to broaden the scope of the <br /> condition limiting onsite well construction. <br /> Development of the property as discussed in previous <br /> correspondence is not contingent upon the Department ' s final <br /> determination. With the understanding that the uncontaminated <br /> portion of the property will be a residential development and the <br /> area above the contamination will be a park with restricted <br /> activities, the Department has stated that the site does not <br /> appear to pose a threat to future inhabitants of the property. A <br /> final determination by the Department regarding remediation needs <br /> will not be addressed until after the RWQCB has completed their <br /> oversight of the investigation. The final determination will <br /> involve a review of the investigation results and RWQCB <br /> conclusions and an assessment of the potential threat to human <br /> health or the environment. <br /> If you have any further questions regarding this matter, <br /> please contact me at (916) 855-7882 . <br /> Sincerely, <br /> Megan Cambridge, Chief <br /> Site Evaluation Unit <br /> Site Mitigation Branch <br /> Region 1 <br /> cc: Mr. Eric Sung, President <br /> Serena Investment Corporation <br /> 21060 Rainbow Drive <br /> Cupertino, California 95014 <br /> Mr. William Crooks <br /> Central Valley Regional Water Quality Control Board <br /> ATTN: Antonia Vorster <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br />