FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Lodi Ready Mix l Report-Soil Boring Insta&_?Irt Project No. 93.1 August 2, 1993 Page 2 The excavated soil was stockpiled on site'?and the excavation was backfilled. The stockpiled soil was divided into 10 piles each containing approximately 50 cubic yards of material. I On October 22, 1991, Geological Technics Inc. (GTI) collected soil samples from s the stockpiled soil and tested them in' order to characterize their chemical content. Only two piles of soil were shown to contain detectable levels of petroleum hydrocarbons: • Soil Pile 3 TPH-Diesel-200 ppm • Soil Pile S Motor 0il-50 ppm 7 i The stockpile characterization work was reported in the November 12, 1991 GTI report-Characterization of Soil Stockpile. i Additional site characterization work was requested by Ms. Laurie Cotulla of the San Joaquin County Public Health Services (SJCPHS) in her April 15, 1993 letter. The procedures, protocol and methods of- the subsurface investigation were proposed in the May 25, 1993 Work Plan- Soil Boring Installation prepared by GTI_ The scope of work included drilling a soil boring as near possible to a former tank excavation soil sample collection point labeled RE-BS-25 Feet. which tested positive for petroleum hydrocarbons Soil samples were L'k proposed to be collected and tested at five foot intervals starting at 25 feet 6 below ground surface to define the vertical extent of soil contamination. Analyses of 'these samples would help determine if a groundwater investigation is warranted. The work plan was approved by Ms. Cotulla of the SJCPHS on June 18, 1993. 2.0 SUBSURFACE INVESTIGATION The purpose of drilling the soil boring was to provide a better understanding of the site's vadose zone environment and how its geology may have affected the transport of petroleum hydrocarbons and its attenuation processes. More specifically it has defined the lateral and confirmed the vertical extent of soil contamination.