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.` California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Fresno Branch Office Governor <br /> Environmental Internet Address: hap://www.swreb.ca.gov/-mgcb5 <br /> Protection 1685 E Street,Fresno,California 93706-2020 <br /> Phone(559)445-5116•FAX(559)445-5910 <br /> TO: JoAnne Kipps FROM: James K. Dowdall <br /> Senior Water ResourceControlEngineer Associate Engineering Geologist <br /> Shelton R. Gray < Registered Geologist#4830 <br /> Senior Engineering Geologist ^ n n <br /> SIGNATURE: vw� <br /> DATE: 11 July 2003 <br /> SUBJECT: ADDENDUM LETTER—ADDITIONAL HYDROGEOLOGICAL <br /> INVESTIGATION WORKPLAN—MUSCO FAMILY OLIVE COMPANY <br /> TRACY, CALIFORNIA <br /> INTRODUCTION <br /> The Musco Family Olive Company is an olive processing and packaging facility operated on <br /> approximately 320 acres in the southwest 1/4 of Section 34,T2S,R4E and the northeast corner of <br /> Section 4, T3S, R4E, MDB&M. The facility is located west of Tracy in San Joaquin County <br /> immediately southwest of Highway 580. This memorandum is in response to Musco's consultants <br /> addendum letter dated 18 March 2003. <br /> SITE GEOLOGY <br /> The site is underlain by Pleistocene and Miocene alluvial deposits. Boring logs indicate that the <br /> subsurface stratigraphy is very heterogeneous, consisting predominately of interbedded material (clay, <br /> silt, sand, gravel) and same clay, sand, and gravel beds. Current data indicates that none of the intervals <br /> described on the boring logs appear to be laterally continuous, making correlations difficult. <br /> Five cross-sections were constructed through the six borings drilled in March 2001 (TW-1, TW-2, GT-1, <br /> GT-2, GT-3, GT-4), the sixteen monitoring wells installed in March through October 2002, and Well <br /> W-2 that was installed in 1985 (see cross-section index map). Detailed correlations cannot be made with <br /> any reliability as the cuttings from the borings were used to estimate the subsurface stratigraphy over <br /> most of the intervals drilled. Without continuous cores or geophysical logs, the thickness and elevations <br /> of the intervals penetrated on the boring logs are only approximate. <br /> Groundwater elevations were plotted on the cross-sections to compare with the screened intervals. Stiff <br /> Diagrams were constructed from groundwater analytical data to determine the similarity of water types. <br /> California Environmental Protection Agency <br /> 'D Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways <br /> you can reduce demand and cut your energy costs,see our Web-site at hap://www.swreb.ca.gov/mgcb5 <br />