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ire n„ }ca 10 7-Eleven/Stockton November 1989 The monitoring wells for the well cluster were constricted of 2-inch-diameter PVC blank casing and 0.020-inch machine- slotted PVC well screen. The sand pack, consisting of Lonestar No. 2/12 sand, was set in the annular space from the bottom of the screened interval to 2-feet above the top of the screened interval. Above the sand pack, a minimum, 3-foot-thick bentonite seal was set in the annular space by pumping through a 1-inch tremie pipe lowered to the top of the sand pack. Above the bentonite seal, the annular space was filled to the surface with ment grout using the previously-described tremie a sand-slurry ce method. The wellheads were finished with street-rated, "Christy boxes" grouted in place, and locking, water-tightfsurfaceswateto protect the well from damage and from the entrance o 'Appendix e presented on the drill logs Well completion details ar . D) on September 22, 1989, one soil boring was drilled and completed as a 2-inch--diameter monitoring well (HW-16) in the ., upgradient location shown on the Site Plan (Figure 2) • gradient stigate po baring location was selected to invetential upg sources of dissolved hydrocarbons. Drilling, soil sampling, and *N well completion were performed as outlined in the above discussion. The boring was drilled Yee •del°completionbelow grade and screened to a depth of 30 D) and the details are presented on the drill logs (Appendix laboratory results of soil sample analyses are presented in Appendix E. - well completion, the monitoring-well cluster Following_ (Mw-15A, g, C) and monitoring well (x-16) were gauged and each well was developed by a sampled. Prior to sampling, as de tel 25 - 40 Y combination of surging and bailing. APP Gk�«�Ilu�rf:lt L