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I 1 i of casing will be surveyed for elevation to facilitate groundwater gradient calculations. Soil cuttings and development water generated by the well construction will be containerized in labeled, 55-gallon steel drums with lids and left onsite pending evaluation of analytical results. Sozl� i � e lledmoo. htyo at footteas at 11fe ::.:.::::........ ...... .... . ...... ...::.:.::..:.::.:.:::.:...:::.. .::::::... :.:...:..............:.......... .. ................ :.:....:.::.::.::::�... . ..:......::... bgs fir lrlhplegrc depn w liefeernng. f fieldr�eningnea# €fdh€tri�1 rngenyss w�l thea a f..... per bong walk subrnxtt for a�� six: i 2.4 Lithologie Description of Soil During installation of the borings, one boring at the Tank l;hand 2-location will be geologically logged at 5 foot intervals from 10 to 35 feet and continuously from 35 feet bgs to the maximum depth of the boring (anticipated to be 50 feet bgs). Monitor well borings will be completed after the soil borings and will be logged at 5 foot intervals from 10 feet bgs to 10 feet above the water {; table (as determined from the soil borings) and continuously,from 10 feet above the water table to the total depth of the well (estimated to be 65 to 70 feet). The samples will be described using standard geological classifications of color, texture, mineral content, etc., and classified according to the Unified Soil Classification System. 1 i� 2.5 Groundwater Sampling 1 The only prior groundwater sampling conducted at the sitewas the April 1989 sampling of the site supply well. Petroleum related hydrocarbons were not detected in the groundwater sample from this well. 'I r The three newly installed monitor wells will be sampled one week'after the wells are developed to allow the aquifer to stabilize. After purging each well, groundwater samples will be collected and analyzed for BTEX compounds and TPH-D. The sampling procedures are discussed in more detail in subsection 3.2.2. Groundwater samples will be taken at the Tank 3 and Tank 4 location with a Hydropunch tool. The tool is inserted through the hollow flight augers and driven into the saturated zone. The 1 tool is opened and a groundwater sample is retrieved by a bailer. The Hydropunch tool is subsequently withdrawn and the boring grouted to the surfac ie. I 3.0 SAMPLING AND SAMPLE ANALYSIS PROCEDURES This section details the sampling and analytical protocol to be utilized in the collection and analysis of soil and groundwater samples for the site. 3.1 General Requirements and Documentation ', + Ij All work will be conducted under the supervision of a California Registered Geologist. A hard bound field log book will be kept for the project by the sampling crew chief. All data relating to the collection of samples and related field activities will be recorded in the log book. Samples collected will be documented in the log book by the sample ID number, location, time, date, and SW\RFCSMC&WCD.Wn 6 04M&144 !1 i �4