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SECTION 1 GENERAL INFORMATION AND CONTRACTOR QUALIFICATIONS 1. 0 Introduction The general scope of work consists of the construction, development and performance testing of two groundwater extraction wells. The extraction wells will be installed for the Occidental Chemical Corporation' s Lathrop Groundwater Remedial Program located on property currently owned by the J.R. Simplot Company near Lathrop, California (Figures 1 and 2) . The extraction wells will be designated EW-6 and EW-7 . The two extraction wells are being installed to accelerate the groundwater cleanup progress of the remedial program. The two new wells, which will supplement five existing extraction wells, have been sited from a review of groundwater monitoring data. Because it is the intent for the wells to draw from certain hydrogeologic zones, the wells will be constructed with screen locations within certain target zones. The actual screen depths will be located within the zones per the results of geophysical logging. For the purposes of the remedial program, the aquifer is divided into three zones. The "shallow" zone extends from 31' to 83 ' the "intermediate" zone ranges from 84 ' to 1501 , and the deep zone extends from 151 ' to 2181 . Well EW-6 will be constructed with two screened sections, one in the intermediate and one in the deep zone. Well EW-7 will be constructed with the screens only in the deep zone. 1. 1 Site Conditions The well sites (shown on Figures 2 , 3 and 4) are located in open field areas, with only fencing causing potential access restric- tion. Access during the summer months is good. Access becomes problematic during the rainy season due to traction problems encountered on wet dirt roads. Subsurface conditions consist of alternating layers of sand, clay and gravels. Drillers logs from previously installed wells are presented in Appendix B. Groundwa- ter will probably be encountered at approximately 15 feet below ground surface. This information regarding sub-surface conditions is intended to assist the Contractor in preparing his bid. However, WESTON does not guarantee either its accuracy or that it is necessarily indicative of conditions to be encountered in drilling the wells described below. The Contractor shall satisfy himself regarding all local conditions affecting his work by personal investigation. Neither the information contained in this section, nor that derived from maps, plans or WESTON shall act to relieve the Contractor from any responsibility for fulfilling any and all of the terms and requirements of this request for quotation (RFQ) . 1 - 1