SITE INFORMATION AND CORRESPONDENCE

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Invitation For Bid: Hartmann antness Site Addresses: Former Chase Chevrolet Facilities(separate Sites): 423 N. Madison 424 N.Van Buren Stockton,California Stockton,California Page l l Three monitoring wells are also required as part of the specified scope of work. In order to continue the existing monitoring well numbering system, the first well (MW10) will be installed approximately 20' west into the public right of way of Madison Street from the curbing adjacent to the Site. All costs for permits, with the possible exception of bond costs, must be included in bid costs. Monitoring well MW11 will be located approximately 20' west of MW2. The wells will be targeted to 50' total depth with a screened interval between 50' BGS to 15' BGS. The third well, MW-12 is to be located northwest of the former tank nest as indicated on Figure 4. MW10 will require an encroachment permit from the City of Stockton prior to installation. As this well is targeted for installation within Madison Street, a traffic control plan must be produced and permission obtained from the City of Stockton during installation of this well. All costs for these activities must be included in the proffered bid. Wells MW10, MW11 and MW12 are intended to be installed with a hollow-stem auger drilling rig using at a minimum 8" O.D. augers and completed as 2" I.D. monitoring wells with traffic rated flush mounted well covers ("Christy Boxes"). Construction techniques shall be in accordance with USEPA SW-846 ( and other sources of technical guidance such as the RCRA Ground Water Monitoring Technical Enforcement Guidance Document [TEGD], 1986 and draft 1992 revisions) and California Code of Regulations Title 23, subchapter 16, sections 2647 and 2648. a4,d W1 Soil samples are to be collected every five feet, beginning at 10' BGS and continuing with the last sample to be collected in the capillary fringe, if possible. For estimating purposes, the same protocol applies for wells as applies for the CPT soil sampling locations. A total of five soil samples per well should be used for cost estimation purposes. Each sample is to be analyzed by the protocols stated above for CPT collected soil samples. Drill spoil and development waters will be appropriately drummed and stored on site for disposal by the Site owner(s) at their expense. Bidders must include costs for development of the wells, and purging and sampling the wells after a recovery period of 72 hours after development. The same analytical regime is specified for the two water samples as is specified above for the soil samples. A future bid specification will address any requirements for assessment services inside of the repair shop for all four potential source areas on the Madison Street Property.