WORK PLANS - Laserfiche WebLink

Home Browse Search

1.0 INTRODUCTION This report,prepared by Enviros, Inc. (Enviros),presets the finding of a Phase I Environmental Site Assessment(ESA)performed for the property located at 1034 Central Avenue,Tracy,California. Unocal Corporation(Unocal)retained Enviros to perform an ESA on the subject property to evaluate historical land use at and in the vicinity of the subject property. In accordance with the agreed upon scope of work presented in the Enviros proposal dated September 9, 1994,we have performed the following environmental services: • Performed an on-site survey of the subject property, • Performed an off-site reconnaissance in the near vicinity of the subject property(not greater than 112-mile radius from the property boundaries), • Performed a literature and records search with regards to the subject property and off- site properties, • Reviewed and evaluated accumulated data, and • Prepared a written report presenting findings, conclusions,and recommendations. 2.0 SITE DESCRIPTION The subject property is located on the southeast corner of Central Avenue and East i 1th Street in Tracy,California(Photo No. 1). The current address of the subject property is 1034 Central Avenue and is occupied by a parking lot and commercial building(former Well Fargo Bank). Several banks have occupied the building in the southern portion of the subject property from approximately the 1950's to 1993. Unocal occupied the northern portion of the subject property from 1921 to 1965, and the address was 8 East 1 lth Street. Properties in the vicinity of the site are of multiple use including commercial and residential.The subject property is bounded by East 11th Street to the north,commercial buildings to the south and east, and Central Avenue to the west. 3.0 GEOLOGY AND HYDROGEOLOGY The City of Tracy is situated in the western portion of the San Joaquin Valley approximately 10 miles east of the Diablo Range.In to Tracy area,the Sierran block underlies the valley sediments.The Miocene and Pliocene sediments rest on the marine upper Cretaceous Panoche Formation which is several thousand feet in thickness.The upper layer consists of siltstones and soft claystones.The lower layer consists of andesitic sands, cobble to pebble conglomerates. Groundwater used for agriculture,industry, and drinking water occurs below the Corcoran Clay layer.Groundwater quality above the Corcoran Clay varies and may contain high concentration of minerals.In the immediate area,depth to first groundwater occurs at approximately 8 feet below grade surface, and regional groundwater flows north to northwest direction. E4194150.01