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r- -Preliminary=S><te Assessment_Report y: _ _ -RIPON PACIFICTRIDE=-� -78i.6' South South Frontage Road,Ripon; California _ 1.0. INTRODUCTION At the request of Mr.Da_vid Atwater of Van De-PoI Enterprises,Advanced GeoEnvfronrriental,Inc: {AGE}has prepared the enclosed Preliminary Site Assessment Report for 816 South Frontage Road; - Ripon;California(site)rThepurpose ofthis investigation was to assess-the lateral and vertical extent' '. of petroleum hydrocarbon-impacted soiFand-ground water at-the=site:The scope'-of work included establishment of five soil borings,"collection;arid analysis of.soil and `grab' groundwater samples and preparation of this report of find ings:.The location of the. site is illustrated on..F gure.l. A plan_ . of the site is illustrated on Figure 2 " ., . This-report has been prepared in accordance with guidelines issued by the Central Valley Regional -Water Quality Control Board (CVRWQCB) for subsurface.investigations.of underground storage z -. tank STs stems. 2.0.- _-BACKGROUND-- The-site-is on the corner of South Frontage Road-and_Goodwin-Road;'in an industnaUcommercial. - - area ofNorth Ripon.The site is situated in an area of low topographic relief at an estimated elevation = �" of 55 feet above sea leyel',(Figure 1).Th property is currently occupied by the Ripon_Pacific Pride. 2.1. REGIONAL GEOLOGICMYDROGEO_LOGIC SETT_ ING ° The site is situated within the .souther"&*'n of the Great.Valley.Geomorphic.P•rovince of•.' California.This province-is-a large,elongate;northwest trending, asymmetric structural trough that- T _ _ has been-divided into northern and-southern:portions.known as.the Sacramento-and San:Joaquin. Valleys, respectively. The Province is aiordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to,the north, and the Sierra-Nevada to the east - The Great Valley has been filled with sediments derived from-both'marine and:continental sources. Thickness of the sedimentary fill ranges-from thin veneers along the valley edges to-riiore than- 20,000 han- - 20 000 feet'in the south--central-portion of the valley.The sedimentary formations range in-age from . 7. _ . . Jurassic to Recent;with-the-older deposits being primarilymarine`in Origin and the younger:deposits :-- being primarily continental:'Contiriental-derived-sediments were primarily deposited_iri lacustrine, fluvial,and alluvial environments with sediirient-sources being the'niountaiin ranges surrounding the valley(Olmsted and Davis, 1961);the site itself is.located on unconsolidated and semi=consolidated = alluvium, lake, playa and-terrace deposits. of Quaternary age (California Divisiorx.of Minesand Geology, 1977).Rocks composing the basement.complex of the Province have not been completely defined but are'believed to--be metamorphic gu and.igneous in orii 'Advanced GeoEbvironmental,Inc. r . t — + _