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20 ft segments, would be a 20 ft interval between 80 ft to 100 ft below ground surface (see attached E- <br />logs and Chip Trays). To summarize, please see below recommendations for GSJ well construction: <br />Filter Pack Material: 1/8" minus gravel pack with adequate development to reach <1 NTU. <br />Screened Interval: 80 ft to 100 ft below ground surface <br />Annular Seal Depth: terminate seal at 60 ft below ground surface and provide 20' blank casing <br />transition to upper screened zone per SJC EHD. <br />Completed Well Depth: 100 ft below ground surface <br />Backfill existing 180 ft deep borehole to within 10 ft (110 ft depth) of completed well depth, <br />using sealing material conforming to Section 4.7.3 of SJC EHD Well Standards, or as <br />recommended by SJC EHD. <br />Installation of backfilled material is intended to prevent intrusion into the upper zones <br />by the lower quality water contained in the lower zones. <br />Installation of sealing material shall be aided by the use of tremie or grout pipe, per SJC <br />EHD Well Standards Section 4.7.2. <br />If you feel these recommendations are not accurate to our prior discussion, please let me know. <br />Please let us know if the County finds this approach acceptable, otherwise we may provide an <br />alternative approach. <br />Thank you, <br />K KJELOSEN <br />S SINNOCK <br />N NEU DECK <br />inc. ENGWEERS & LAND SURVEYORS <br />CELEBRATING 60 YEARS <br />Steven Whittlesey <br />Junior Civil Engineer <br />1550 Harbor Blvd. Suite 212 West Sacramento CA 95691 <br />916 403-5900 I fax: 916 403-5901 <br />swhittlesey(aksninc.com I httos://www.ksninc.com <br />Warning: <br />Information provided via electronic media is not guaranteed against defects including translation and <br />transmission errors. If the reader is not the intended recipient, you are hereby notified that any <br />dissemination, distribution or copying of this communication is strictly prohibited. If you have received this <br />information in error, please notify the sender immediately. <br />2