Laserfiche WebLink
Apache Plastics . 2 - June 2012 <br /> Claim No. 1696 <br /> ATTACHMENT <br /> SUMMARY OF BASIC SITE INFORMATION (Conceptual Site Model) <br /> Site Location/ History <br /> • The Site is located on the 2050 East Fremont Street in Stockton , California and is <br /> commercial property. <br /> • The Site is bounded by East Fremont Street to the north , businesses to the west, east <br /> and south. The surrounding area is mixed commercial and residential . <br /> • Twenty monitoring wells have been installed and monitored since 1994. <br /> • Site map showing the location of the former UST, monitoring wells , and groundwater <br /> level contours , is provided at the end of this summary. <br /> Pollutant Source <br /> • Nature of Contaminants of Concern : Petroleum hydrocarbons only <br /> • Source, Date reported , and Status of Release: UST system , 30 August 1988 , USTs <br /> removed <br /> • Free Phase Hydrocarbons: None reported <br /> Geology/ Hydrogeology <br /> • Stratigraphy: The site is underlain interbedded and intermixed sand , silt and clay. <br /> • Maximum Sample Depth: 139 feet below ground surface (bgs) <br /> • Minimum Groundwater Depth : 40 . 79 feet bgs at monitoring well MW4 <br /> • Maximum Groundwater Depth : 53.70 feet bgs at monitoring well MW-14 <br /> • Current Average Depth to Groundwater: 41 feet bgs <br /> • Appropriate Screen Interval : Yes <br /> • Saturated Zones(s) Studied: 40 to 125 bgs <br /> • Groundwater Flow Direction : Predominately northeast to east at 0. 004 feet/foot <br /> Groundwater Trends : <br /> Groundwater has been regularly monitored for 17 years. Benzene trends are shown below, <br /> source area (MW-9) and down gradient (MW-8) . <br /> Benzene Trend for MW- 9 <br /> 120000 <br /> 100000 - - - -- - - -- . . - - . _ - _.-- ------ . <br /> 80000 <br /> 60000 -- <br /> d <br /> m 40000 <br /> 20000 <br />,i OO`o OO1 OOH O�i Oti0 Otiti <br /> anti ��ti anti anti o-�ti a��" <br /> anti anti tk anti anti o.�1 <br /> 4 <br /> N <br />