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19 <br />Date: 7-22-87 <br />To: Environmental health Staff' <br />From: Laurie Cotulla <br />UST/Itaz . Waste Unit <br />RE: Monitoring Well Inspections <br />The following guidelines apply to monitoring well inspections associated <br />with site assessments and unauthorized release investigations: <br />General <br />1. The initial $35.00 permit fee paid at the time of application pays <br />for one inspection or one hour of inspection whichever is less. <br />Any additional inspection visits and/or time must be billed. Make <br />sure the billing; information is provided. <br />2. If the grout cannot be completed before 4:30 PM the driller must stop <br />work until the next working day or agree to pay overtime for time <br />after 4:30 PM. Call in and notify supervisor you will be working <br />overtime or receive authorization prior to leaving office to work <br />overtime if responsible part;,, willing to pay. <br />3. Grout inspections must be scheduled 48 hrs in advance. <br />M.W. Grout Inspections <br />1. Identify well or boring # and location on site drawing. <br />2. Document construciton details: <br />a. total depth of boring <br />b. �jcreen length <br />C. water table depth <br />d. depth to top of sand/gravel pack <br />e. depth to top of bentonite pellets <br />f. depth of interval to be grouted <br />g. any contamination noted such as odor or visual evidence <br />3. Approved grout mixtures are cement/bentonite slurry or cement <br />sand slurry described in attachment. Neat cement is also allowed <br />at minimum of 7 sack mix. Any variation from these mixes must have <br />been approved by another regulatory agency such as RWQCB, DUBS-'1'SCD <br />and be identified in the approved work plan. <br />4. Grout may be placed by free fall from surface if annular space above <br />bentonite pellets is: <br />a. less than 10 ft. <br />or <br />b. less than 15 ft. and top of bentonite is greater than 10 ft <br />above water table. <br />5. All other grouts must be placed by tremie method or by using hollow <br />stem auger as described on attached sheet. Any other method must <br />have been approved by another regulatory agency and be identified <br />on the approved work pian. <br />6. A concrete mixture with aggregate may be used for last 1f to 2 ft of <br />vrout if settinv a christy box or vault. <br />