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David Wang, P.E. <br /> Page 4 <br /> August 17, 1989 <br /> Sections 3 . 2 . 2 . 13, 3 . 4 . 4 . 15, and 3 . 4 . 5. 10 GEOLOGIC WELL LOGS: <br /> o The Department recommends that geophysical logs <br /> (spontaneous potential, short and long normal resistivity, <br /> and caliper) supplement the formation sampling at well each <br /> cluster. These logs would supply a reference that formation <br /> samples could be compared against. <br /> Sections 3 . 2 . 2 . 10, 3 . 4 .4 . 12 , and 3 . 4 . 5.7 WELL SEALS: <br /> o The Department prefers the use of bentonite pellets over <br /> slurry in the construction of well seals. Bentonite slurry <br /> may be forced into the formation by the weight of the grout, <br /> defeating the purpose of a well seal . <br /> Section 3 . 8 . 2 . 2 SYSTEM MONITORING: <br /> o The statement of work requires that the contractor be <br /> on-site for only one eight hour day per week to provide <br /> routine monitoring. We are concerned that the period <br /> between visits is too long. The Department recommends that <br /> DDTC personnel be trained in the systems op>_rations and <br /> perform daily spot checks of its' performance. Also DDTC <br /> and regulatory agency personnel should be included in the <br /> notification process in case of a system failure. <br /> Section 3 . 10 GROUNDWATER MODELING <br /> o The Department requests that a copy of the publicly <br /> available software be submitted for our review. Data to be <br /> evaluated should also be forwarded. We request that the <br /> programs and data be submitted on 3 .5 inch disks at a 720 k <br /> density. <br /> Section 3 . 15 ADDRESSES <br /> o The Department requests that deliverables be sent to: <br /> The Department of Health Services <br /> Toxic Substance Control Program <br /> ATTN: Mr. David Wang, P.E. <br /> 4250 Power Inn Road <br /> Sacramento, CA 95826 <br /> Any changes will be further notified. <br /> ii:�P`inasco <br /> Waste Management Engineer <br />