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November 20, 1986 Harding Lawson Associates 18040,001.03 Ms. Laurie Cotuila San Joaquin Local Health District Page 2 We anticipate that all wells will be 25 feet deep. The wells will be constructed with 20 feet of screened section (0.02-inch x 2-inch slots) and 5 feet of solid PVC well casing (2-inch- diameter Schedule 40 PVC) . The casing bottoms will be capped. The annular area between the casing and boring will be back- filled with No. 3 Monterey sand. A 6- to 12-inch layer of bentonite will be placed on top of the sand, and the remain- der will be backfilled with a cement/bentonite slurry. The wells will be encased in a lockable well cover and protected by a Christie Box prior to water sampling. The wells will be developed by removing at least 3 well volumes from each well. Chemical tests will be performed on selected soil samples obtained during drilling operations and on a ground-water sample from each well. The soil and water samples will be tested for their concentrations of total hydrocar-bp s, ben_ zed, Sa,j�, and xylene. All materials removed from the borings will be placed in 55-gallon drums and stored on site. After the chemical test results are available, the disposition of the materials in the drums will be determined. Datum Exploration will perform the drilling operations and install the monitoring wells. They are licensed to install ground-water wells (License No. 48082) . We include with this letter a check for $35 for the cost of the well permit. We appreciate your help and cooperation in allowing us to provide a quick response to 7-Eleven Stores. Yours very truly , HARDI NG LAWSON ASSOCIATES Stephen J Osborne, P.E. Associate Engineer SJO/s k 3 copies submitted Attachment ccs: 7-Eleven Stores/Division 2299 Attention: Mr. Walt Lubcke Mr. Don Gray, HLA/Novato