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Workplan for 19256 North Highway 99- 12/22/98 page 6 Job No 024 98 2.2 GEOLOGY AND HY DROGEOlLOGY Regional Geology ' The site is located within the Great Valle Province of California i n of the Valley e Ca o a The Great Valley s one largest structural depressions in the world It is approximately 400 mules long and 50 miles wide The topography of this Province vanes from slightly below sea level to approximately 400 feet at its northern and southern ends Most of the surficial lithology of The Great Valley Province consists of ' mainly the alluvium flood and delta plain deposits of two mayor rivers (the Sacramento to the north and the San Joaquin to the south) and their tributaries, which account for approximately 40 percent of the total river discharge in California ' Site Geology ' The site property rests on Quaternary Alluvium Deposits (Qal) consisting of interbedded silty sands to sandy silts Hydrogeology The site is located within the San Joaquin Basin Hydrologic Study Area There are 26 groundwater ' basins in the study area The San Joaquin Valley covers 13,500 square miles and is the largest groundwater basin in the state The San Joaquin River drains most of the water in this basin The water bearing material consists of Younger and Older alluvium with a maximum thickness of 4,400 ' feet The well yields average 1,100 gpm, with a maximum yield of 3,200 gpm The site property rests near the north-central section of the Eastern San Joaquin County Basin This basin is bordered ' on the north by the Sacramento-San Joaquin county lines and to the south by the San Joaquin County line and the Stamslaus River The western boundary is the San Joaquin River and the southern boundary is designated by the edge of the alluvium Groundwater is anticipated at an approximate ' depth of 35 feet bgs at the site 3.0 ]REPORTS Technical reports will be prepared to meet requirements by the Central Valley (5S) Regional Water Quality Control Board(CV5SRWQCB) and the SJCEHD requirements Reports will include a site history, figures identifying sample locations, drilling logs, summary of all findings, analytical results, conclusions, and recommendations for further action, if necessary 4.0 GENERAL PRACTICES Gallardo do Associates standard procedures for soil/water sampling are within the guidelines set by the California Environmental Protection Agency(EPA) and CV5 SRWQCB Drillmg, construction, • and completion of all exploratory borings and well installations will be in conformance with procedures established in this workplan