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DATA GAP ASSESSMENT WORK PLAN <br /> Stockton Charter Way Commingled Plume <br /> July 30, 2014 <br /> 4.0 Well Installation <br /> 4.1 SITE-SPECIFIC HEALTH AND SAFETY PLAN <br /> A Site-specific HASP will be prepared prior to the well installation activities as described in Section 3.1 <br /> of this Work Plan. <br /> 4.2 Permitting <br /> Prior to performing the well installation activities, necessary permits will be obtained from the SJCEHD <br /> and City of Stockton. In addition, necessary executed access agreements will also be obtained from <br /> affected property owners. <br /> 4.3 Preliminary Field Activities <br /> Well locations will be marked or cleared of underground facilities prior to well installation as described in <br /> Section 3.3 of this Work Plan. <br /> 4.4 SOIL BORING ADVANCEMENT, SOIL SAMPLING ANALYSES, AND WELL <br /> INSTALLATION <br /> Prior to drilling, the well borings will be air-knifed to approximately 8.1 ft bgs to inlv&tigate that no <br /> unidentified underground facilities exist within the area of drilling. A total of @levee groundwater <br /> monitoring wells ensu; A69,ens <n cr"=T-uaC ST=430D' See16LOk <br /> S *,an 2 ll be installed in accordance with the SJCEHD Well 2— <br /> Standards(SJCEHD,2005). Each boring will be advanced using a sonic drilling rig equipped with heavy- 02'LLIecj <br /> walled down-hole casing telescoped to help seal off shallow groundwater-bearing zones. Cores will be L 1- (7F <br /> evaluated for continuous soil stratigraphy. Soil cores will be classified using the Unified Soil Classification (JYD go V CD <br /> System by a geologist under the direction of a State of California Professional Geologist. Soil cores will be WPA IS <br /> screened in the field for the presence of volatile organic compounds (VOC) using a photo-ionization )YlSf0.114�1lM <br /> detector (PID). Soil classifications, VOC measurements, sample intervals, and other pertinent geologic <br /> information will be recorded on soil boring logs. Down-hole drilling equipment will be decontaminated <br /> with high pressure steam following the completion of each soil boring. Down-hole sampling equipment <br /> will be decontaminated between samples using an Alconox detergent solution and a tap water rinse. <br /> Selected soil samples will be submitted for chemical analyses and will be based on visual observations,soil <br /> type, and VOC measurements. At least two soil samples will be analyzed from each boring based on <br /> highest PID and directly above the water table. Additional samples will be collected and analyzed as <br /> warranted. The samples will be placed on ice in an insulated cooler until relinquished,under documented <br /> chain-of-custody control, to a certified analytical laboratory. Select soil samples will be analyzed for <br /> gasoline range organics (GRO) using Environmental Protection Agency (EPA) Method 8015B(M) and <br /> benzene, toluene, ethylbenzene, total xylenes (collectively BTEX), methyl tert-butyl ether (MTBE), tert- <br /> butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether <br /> 8 <br />