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r <br /> .-:r.Sao:i4�'1tf ^i5(tk�*'aa!' r•a^`i6►�r�.,!"� i,w�'=+- `� <br /> December 1.5, 1987 Harding Lawson Assoolaha <br /> 180400001.03 <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 remainsr 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 boot. 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 an 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 /> Of total hydrocarbons. Mater samples will be tested for their <br /> concentrations of benzenes, tolulene, xylene and ethylbenzene. <br /> All materials removed from the borings will be placed 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 <br /> determined. <br /> Datum Exploration will perfom the drilling operations and install p <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 very truly, <br /> HARDING LAMSON ASSOCIATE <br /> Stephen J. Osborne <br /> Civil Engineer <br /> SJO/sz <br /> 3 copies submitted Y <br /> AttacFment ( r <br /> ccs: 7-Eleven Store/Division 2?99 <br /> Attention: Mr. David Lewis f <br /> l <br /> Mr. Don Gray, HLA/Novato rti <br /> •-.qtr ..,•,w-.w <br /> �y <br />