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l <br /> December 15, 1987 Hai-"lnq Lawson Associates <br /> � . 18040,001.03 <br /> Ms. Laurie Cotulla <br /> San Joaquin Local Health District <br /> Page 2 <br /> the ground-water level. The casing bottoms will be capped. The <br /> annular area between the casing and boring will be backfilled with <br /> No. 3 Monterey sand. A 6- to 12-inch layer of bentonite will be <br /> placed on top of the sand, and the remainer will be backfilled with <br /> a cement/bentonite slurry. The wells will be encased in a lockable <br /> well cover and protected by a metal watertight box. The wells will <br /> be developed by removing at least 3 well volumes from each well and <br /> we will monitor conductivity, temperature and ph before water <br /> sampling. <br /> Chemical tests will be performed on selected soil samples ob- <br /> tained during drilling operations and on a ground-water sample <br /> from each well. The soil. will be tested for its concentration <br /> r of total hydrocarbons. Water samples will be tested for their <br /> concentrations of benzene, tolulene, xylene and ethylbenzene. <br /> ]] - <br /> All materials removed from the borings will'beplaced in- 55-gallon - <br /> drums and stored on site. After the chemical test results are �. <br /> available, the disposition of the materials in the drums will be <br /> Ems. determined. <br /> Datum Exploration will perform the drilling operations and install <br /> the monitoring wells. They are licensed to install ground-water <br /> wells (License No. 48082) <br /> We include with this letter a check for $35 for the cost of the well <br /> permit.. . We appreciate your help and cooperation.in allowing us to <br /> provide a quick response to 7-Eleven Stores. <br /> Yours verytruly, <br /> Y, <br /> ,.HARDING LAWSON.ASSOCTATES <br /> Stephen J. psborne <br /> ,rt r Civil.Engineer <br /> SJO/sz <br /> l _ f <br /> 4r 3 copies submitted <br /> Attachment i <br /> g ccs: 7�-Eleven Store%Division 2299 t <br /> Attention: Mr. David Lewis <br /> Mr. Don Gray, HLA/Novato <br /> N _ <br />