Laserfiche WebLink
LN According to mr. Diamond the tanks were installed and utilized <br /> before he began operating at the site. Therefore the tanks have <br /> been at the site for more than 20 years . <br /> LO <br /> SITE DESCRIPTION <br /> The site description is as follows . The salient features are <br /> diagrammed on the attached Figure 2 . <br /> The removed underground tanks were located on property leased by <br /> `' Carnation Company in the southeast corner of a larger property <br /> owned and operated by Chevron. <br /> The underground tanks included two gasoline and one diesel fuel <br /> storage vessels located under a concrete pad in the northeast end <br /> of the Carnation lease. Piping from the fuel storage area <br /> carried fuel to the extreme north end of the Carnation lease <br /> where a below grade valve system switched from one fuel tank to <br /> another before being released out of the dispensing pump nearby. <br /> The tanks included two 3 .500 oalInn tanks and gne 4 , QOO-- allon <br /> tank. One of the 3 500 gallon tanks and the 4 ,Q0__gAJJon tank <br /> are the tanks that contained leaded gasoline and the subject of <br /> further investigation. The tanks were located fifty feet north <br /> of the Carnation warehouse and 165 feet north of Fremont Street. <br /> L No septic tanks, Private or munici al wells were o%m_ tQ_J?,P in <br /> the immediate vicinity. Utilities to the site included sewer and <br /> water and were delivered from Fremont Street. The adjacent <br /> Chevron property includes three Chevron natural gas wells <br /> approximately 220 feet to the west of the site of the removed <br /> tanks . <br /> SITE SOILS, GEOLOGY AND HYDROLOGY <br /> �.. The soils at the Chevron property have been mapped by the <br /> U.S.D.A. Soil Conservation Service as Stockton clay (adobe) . <br /> Stockton clay is a fine-textured, dark gray to black clay, <br /> deposited by quiescent or slow moving water. The parent material <br /> was of mixed origin, but primarily igneous rock. According to <br /> the survey some in-place development of this soil has occurred <br /> also. The development is a tight clay subsoil and is the result <br /> of transport and re-deposition of very fine particles from the <br /> top of the soil profile to the subsoil, resulting in a high <br /> colloidal clay content and impervious structure in the subsoil. <br /> The impermeability causes temporary perched water tables and <br /> L. rapid development of surface ponding during normal precipitation <br /> -3- <br /> LN <br />