ARCHIVED REPORTS_XR0004914 - Laserfiche WebLink

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Site Closure Summary ' Fuller Mobile Home Park August B, 1997 3651_ Louise Avenue, Lathrop, California Page: 3 r On June 19, 1996 San Joaquin County PHS/EHD rejected implementation of the ' Feasibility Study until said time as the eastern boundary of soil contamination was identified ' In August 1996 WHF reported on the 2nd Quarters Groundwater measurements, gradient and contamination levels ' On October 11, 1996 San Joaquin County PHS/EHD requested a Receptor Survey be conducted along with numerous other tasks such as Fate and Transport Modeling and Health Risk Assessments t 1997 WHF completed a Receptor Survey of a 2 000 foot radius at Fuller On March 12, p p y , Mobile Home Park The additional work seemed unjustified and not warranted by the ' property owner On April 9, 1997 WHF in conjunction with HKM Environmental, Inc conducted a Quarterly Groundwater Morutonng Event In May 1997 San Joaquin County requested a re-samphng of MW-3 and that the sample be split Also requested at that time was additional information on the Receptor Survey 2.D Geology and Hydrology The subject property is located in Califonua% Central Valley The central valley is } p p y approximately 400 miles long and averages 50 miles wide encompassing approximately 20,000 square miles The valley is a large asymmetric trough that is bounded by granitic, metamorphic and marine sedimentary rocks of pre-tertiary age This trough has been filled ' with as much as 30,000 feet of sediment in the San Joaquin Valley portion to the South, and as much as 60,000 feet of sediment in the Sacramento Valley portion to the North The age of the sediments range from Jurassic to Holocene and include both marine and continental rocks and sedimentary deposits (Olmstead and Davis, 1961) The continental rocks and deposits of tertiary and quaternary age compose a number of formations In total they constitute the major aquifer of California's Central Valley and yield large quantities of water to wells These deposits are heterogeneous mixtures of poorly sorted clay, silt, sand and gravel In places, some beds of claystone, siltstone and N sandstone and conglomerate The maximum thickness in these formations has been reported to be 3,000 feet (Olmstead and Davis, 1961)