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<% California Regional Water Quality Control Board <br /> Central Valley Region <br /> Winston A.Aickox Robert Schneider, Chair <br /> Secretaryfor Fresno Branch Office Gray Davis <br /> Environmental Governor <br /> Intemet Address: http://www.swrcb.ca.gov/-mgcb5 <br /> Protection 1655 E Street,Fresno,California 93706-2020 <br /> Phone(559)445-5 L 16•FAX(559)445-5910 <br /> TO: Jo Anne Kipps u FROM: James K. Dowdall <br /> Senior Water Resource Control Engineer Associate Engineering Geologist <br /> Shelton R. Gray SQA Registered Geologist#4830 <br /> Senior Engineering Geologist <br /> SIGNATURE: <br /> DATE: 14 August 2003 <br /> SUBJECT: GEOPHYSICAL INVESTIGATION REPORT—MUSCO FAMILY OLIVE <br /> COMPANY - 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 t/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 the April 2003 <br /> Geophysical Investigation Report prepared by Spectrum Geophysics for the facility. <br /> SITE GEOLOGY <br /> The site is underlain by Pleistocene and Miocene alluvial deposits. Cross-sections constructed by <br /> Regional Board staff from boring log information and supplemented by geophysical data resulting from <br /> the resistivity surveys indicate that the subsurface stratigraphy is very heterogeneous, consisting <br /> predominately of interbedded material (clay, silt, sand, gravel) and some clay, sand, and gravel beds. <br /> Current data indicates that none of the intervals described on the boring logs appear to be laterally <br /> continuous. <br /> Groundwater elevations were plotted on the cross-sections to compare with the screened intervals. Stiff <br /> Diagrams were used to assist in differentiating water types. None of the diagrams had a signature similar <br /> to the 84-MGAL Pond wastewater. <br /> RWOCB PROPOSAL <br /> Prior to reviewing the geophysical investigation, we previously proposed drilling thirteen deep <br /> exploratory borings with mud rotary and geophysically log each boring at locations shown on a facility <br /> California Environmental Protection Agency <br /> ID <br /> pd 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 http://www.swrcb.ca.gov/mgcb5 <br />