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Project No 014-98081 Page No 2 7 r 1 Item No. 3. In addition to the proposed laboratory analyses, SJCEHD will select the soil samples to be analyzed by EPA Method 8260 for all of the seven oxygenates noted in the policy enclosed within the SJCEHD's June 23, 1998 letter After the monitoring wells are installed and ` developed, the groundwater samples are to be analyzed for all of the oxygenates by Method 8260 Item No. 4 Only neat cement (Type 11-Portland), or cement with 3%-5% NSF labeled bentonite by weight, or an approved bentonite slurry can be used to grout monitoring wells The ratio of ' potable water to cement is regulated A 94 pound bag of cement to five gallons minimum and ten gallons maximum is the only acceptable rano Cement grout will be tremie-pipe installed from the bentonite up to the surface Item No. 5 Based on the request to obtain soil samples from a depth of 50 feet bgs (which may be as much as 20 feet below the surface of the water table), Krazan proposes to drill the soil borings using hollow stem auger The proposed direct-push rig contractor was unable to state with certainty that their equipment would be able to acquire soil samples from 60 feet bgs Subaqueous samples will be collected with a split-spoon sampler equipped with an' I J "sand catcher"or"sand basket" On behalf of Wilbur-Ellis, Krazan respectfully requests that SJCEHD approve a request to extend the Phase One report submittal date to August 31, 1998 If you have any questions or if we can be of further 1 assistance, please feel free to contact our office at (209) 348-2200 Respectfully submitted, KRAZAN & ASSOCIATES, INC Bruce E Myers Registered Geologist No 4740 BEM/IJk Attachment le herewith lc Ms Jan Thompson, Wilbur-Ellis I c Mr Douglas Reynolds, H&H Engineering KRAZAN &ASSOCIATES, INC Offices Serving the Western Untied States 09091 ADD