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S113-4 10', 20' Near used oil AST. 20' TPH-GROs, DROs/OROs, <br /> BTEX/MTBE via EPA Method <br /> Potential past Haz Mat 8015/8260B <br /> use Area <br /> S113-5 10', 20' Near used oil AST. 20' TPH-GROs, DROs/OROs, <br /> BTEX/MTBE via EPA Method <br /> Potential past Haz Mat 8015/8260B <br /> use Area <br /> S113-6 10', 20' Potential past Haz Mat 10', 20' RCRA Metals via EPA Method <br /> use Area 6010B/7471 (only for 10' soil <br /> sample), TPH-GROs, <br /> Southwestern corner of DROs/OROs, VOCs via EPA <br /> lot. Method 8015/8260B <br /> SB-7 10', 20' Current auto repair 10', 20' RCRA Metals via EPA Method <br /> garage 6010B/7471 (only for 10'soil <br /> Potential past Haz Mat sample), TPH-GROs, <br /> use Area DROs/OROs, VOCs via EPA <br /> Southwest of current Method 8015/8260B <br /> auto repair garage. <br /> SB-8 15', 20' Current auto repair 20' TPH-GROs, DROs/OROs, VOCs <br /> garage. via EPA Method 8015/8260B <br /> Potential past Haz Mat <br /> use Area <br /> Soil samples not selected for analyses were placed on hold <br /> • Preserved all collected soil samples in an ice chest with ice to keep a 4 degrees Centigrade <br /> sample preservation temperature until the shipment of samples the following day to a California <br /> State Certified Hazardous Waste Laboratory, for analysis. U.S. Environmental Protection Agency <br /> approved chain-of-custody records were kept to track the possession of samples from the time they <br /> were taken in the field until the time they were analyzed. <br /> • Logged each soil boring using the Unified Soils Classification System under the supervision of <br /> ENCON's Project Geologist. Soil borings are included in Appendix D. <br /> • Backfilled each boring with grout and returned the surface conditions to their original condition <br /> (asphalt/concrete) upon completion of soil sampling. <br /> 4.2 METHODOLOGY <br /> November 25th 2013 <br /> Prior to advancing the borings, the property owner was notified of the work schedule. ENCON visited the <br /> Property to verify existing site conditions and pre-mark proposed boring locations. Additionally, ENCON <br /> notified Underground Service Alert (USA) of the intent to excavate or drill so that subsurface utilities <br /> would be marked to avoid potential damage. <br /> November 25th, 2013 <br /> Cruz Brothers Locators (CBL) conducted a geophysical survey to search for any subsurface anomalies <br /> and to clear utility lines and proposed boring locations. <br /> Encon Solutions, Inc. <br /> -10- <br />