ARCHIVED REPORTS_XR0011735 - Laserfiche WebLink

Home Browse Search

Phase 1I Environmental Site Assessment Multi-Modal Station Stockton,San Joaquin County,California Page 2 • Condor Identified two HRECS on the site + A cabinet, paint, and sign shops were located at 930 E Miner Avenue (248 N Aurora Street) in the 1940s through the early- to mid-1960s If historical disposal methods for paints and solvents were used on site, there is a potential risk for soil and groundwater contamination + Auto repair and auto body shops have been located at several site properties for many years Addresses of former and current auto repair and body shop businesses include 122, 204, and 210 N Grant Street, and 729, 811, 815, 829, 843, and 915 E Weber Avenue Typical wastes for these facilities include motor oil, antifreeze, brake fluid, paint, and solvents While current businesses appear to be disposing of waste materials in the proper manner, no records of how waste disposal at these businesses was conducted in the past were identified If common historical disposal methods were used on site, there is a potential risk for soil and groundwater contamination These RECs and HRECs were investigated in greater detail during the Phase II ESA Additionally, the businesses on parcels without previously identified RECs or HRECs were further reviewed to investigate past handling practices of hazardous materials and wastes The potential liability for the cleanup of hazardous substances and the available defenses to such liability are outlined in the Comprehensive Environmental Response, Compensation, and Liability Act(CERCLA) and its amendments, commonly known as the Superfund law The American Society of Testing and Materials (ASTM) states that a Phase II ESA, performed after the completion of a Phase I ESA, will help to satisfy the requirement of"all appropriate inquiry into the previous ownership and uses of the property consistent with good commercial or customary practice" [42 USC § 9601(35)(B)] and will help to provide "innocent landowner defense" (ASTM Standard E 1527-00, See 1 1) to the purchaser involved in a . commercial real estate transaction In addition, ASTM asserts that a Phase II ESA evaluates RECs "for the purpose of providing sufficient information regarding the nature and extent of contamination to assist in making informed business decisions" (ASTM Standard E 1903-97, See 1 2) including "the potential financial exposure associated with environmental risks" (ASTM Standard E 1903-97, Sec 3 1 3) It should be understood that a Phase II ESA only further investigates the site for existing or potential contamination 3.0 GENERALIZED GEOLOGIC SETTING The site is located in the middle of the San Joaquin Valley in the Great Valley Geomorphic Province The Great Valley Geomorphic Province is a northwest-trending, westward-dipping geosyncline that has been filled with up to six vertical miles of lithified marine and non-marine sediments, and unlithified non- marine sediments Geologic conditions at depth are relatively well known as a result of exploratory and production drilling for the nearby French Camp, Lathrop, and Stockton natural gas fields According to published geologic maps, surface deposits underlying the site consist of eolian sand belonging to the upper member of the Modesto Formation These sand deposits are estimated to be more than 9,000 years old and are underlain by more than 3,000 feet of Cenozoic alluvial sediment primarily consisting of Pliocene and Miocene sands and clays Regionally, the upper 3,000 feet of Great Valley alluvial sediments are resultant of erosion of the ,Sierra Nevada granitic basement rocks to the east and, to a lesser degree, the Coast Range marine and non-marine sediments and Franciscan Assemblage and granitic basement rocks to the west The unconsolidated Cenozoic alluvial sedimentary deposits are unconformably underlain by an estimated 9,000 to 10,000 feet of Upper Cretaceous marine sands and shales belonging to the Great Valley • Sequence The Upper Cretaceous sand units of the Great Valley Sequence are the primary natural gas �aC� CONDOR