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— zppff t _ 2.6.3 Hydrology/Hydrogeology Groundwater movement in the site vicinity is assumed to be south- ward. Groundwater movement in the Stockton vicinity has been shown to flow toward a cone of depression located a few miles southeast of the site ("San Joaquin county Investigation", State Water Resources Bulletin, No. 11, June 2955). Depth to ground- water is presently approximately 30-35 below grade. The nearest surface water body to the site is the Stockton Deep Water Channel which r=:ns esst to west and is connected to the F Sacramento-San Joaquin. Celta- The east end of the channel termi- nates just west of the site at Center Street. The site itself n overlies the former wast end of the channel. Water in this sec- tion of the channel experiences little movement and is slightly affected by tidal fluctuations. The site is 2.75 miles south of the Calaveras River and 2.5 miles �- north of Walker Slough, a tributary to the San Joaquin River. 2.7 Proximity of private, municipal and irrigation wells: w A survey of all water wells within a one half mile radius of the site was conducted based on information received from the Cali- fornia Department of Water Resources. The closest well to the Fa Site is directly across El Dorado Street. The approximate loca- tions of known water wells within one mile of the site are plot- ted on Figure 3. n. 2.8 vocations of storm drains and sewer lines: The location of the storm drains and sewer lines in the site vicinity are plotted on Figure 2. Existing underground utilities f have been located on-site. 3.0 INVESTIGATIVE METHODS AND PROCEDURES f w. To further characterize the soil and groundwater contamination beneath the site and evaluate remedial alternatives, WaterWork will perform additional investigative procedures. To further assess the lateral and vertical extent of soil and groundwater cortainination at the project site WaterWQrk proposes to drill. two monitoring wells, 'two soil borings, and three vapor extraction wells. To evaluate remedial alternatives both a vapor extraction test (VET) and pumping tests will be performed. One of the monitoring wells will be installed on the eastern boundary cf the property to determine if ground.water-.has.-migrated -----.---------- ---------- ` - ---- -of€--site -- The---second-monitariaig-we12 will be installed upgradi- ent of the former .tank pit to ensure that tidal fluctuation } hasn't transported dissolved hydrocarbons in a westerly direc- 3