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swoo / L+ Phase 11 Environmental Site Assessment Work PIan APN 149-200-10,Stanislaus Street,Stockton,CA Page 2 `o 3.1 SITE PREPARATION Condor will complete drilling permit applications and obtain the required permits from the San Joaquin �. County Environmental Health Department (EHD) prior to the fieldwork. Condor will schedule and coordinate all field activities through the property owner and the EHD as needed. The proposed boring locations will be marked with white paint and USA will be notified at least 72 hours in advance of the LN fieldwork to locate and identify underground utilities in and near the work area. However, because companies contacted by USA may not identify utilities past private property lines and into the site, it is the responsibility of the property owner to identify site utilities. 3.2 GEOPROBE BOREHOLES The boreholes will be advanced using a Geoprobe® percussion hammer driven sampler equipped with a 1.75-inch O.D., 4-foot long, core barrel, fitted with a clean, single use, polyethylene liner. A licensed C57 drilling contractor will drill the boreholes under the supervision of a Condor geologist. The soil samples will be screened for the presence of organic vapors in the field with a photoionization detector (PID). `a Following completion of the sampling, the boreholes will be filled with neat cement. The cement will be tremied into the borehole to avoid bridging. 3.3 SOIL SAMPLING Continuous core samples will be collected. The soil retained inside each core barrel will be logged according to the Unified Soil Classification System. Geological logs will be prepared containing field 1v observations including soil type, estimated moisture content, PID measurements, and the presence of staining or odor. Two soil samples will be selected from each borehole for laboratory analysis for total extractable petroleum hydrocarbons (TEPH), total petroleum hydrocarbons quantified as gasoline (TPH- +� G), and benzene, toluene, ethyl benzene, and total xylenes (BTEX.). Soil samples will be selected at intervals suggestive of soil contamination based on field screening. If there is no evidence of contamination, samples will be collected from 10 feet and 20 feet below the ground surface. The soil samples will be retained, undisturbed, in the liners. Each sample end will be covered with Teflon® sheeting, the ends sealed with plastic end caps, and labeled. All soil samples selected for laboratory analyses will be stored in a cooler chilled with ice and delivered under chain-of-custody procedures to a k.. California Certified Laboratory and analyzed using U.S. EPA Methods and California-approved methods under quality assurance measures. Prior to use, the soil sampling equipment will be decontaminated by washing in a solution of laboratory- grade, non-phosphate detergent and hydrocarbon-free water, and double rinsing with hydrocarbon-free water. The soil cuttings will be placed in 55-gallon drums, sealed, labeled, and left on-site to await !V disposal pending results of the laboratory analysis. 1V ia CONDOR it