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22 February 2010 <br /> AGE-NC Project No. 96-0235 <br /> Page 2 of 7 <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the EHD and any necessary encroachment <br /> permits from the City of Stockton. As required by EHD permitting, an up-dated health and safety <br /> plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for <br /> Hazardous Waste Site Activities (National Institute for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to <br /> mobilization,each soil probe location will be clearly marked and a utility clearance obtained through <br /> Underground Service Alert. — <br /> 2.2. DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance two, deep, pilot soil boringson-site for installation of ground water <br /> monitoring wells using a truck-mounted,hollow-stem drill rig equipped with 8.25-inch hollow-stem <br /> augers. Soil pilot boringswill be advance�h� g to approximately 60 feet below surface grade <br /> (bsg) for boring MW27 and to approximately 75 feet bsg for boring MW28. The total depth of the <br /> well boring may vary according to hydrogeologic/geologic conditions encountered during drilling. - - <br /> • Proposed pilot boring MW-27 will be advanced approximately 60 feet east-southeast of <br /> existing well MW-1, to monitoring dissolved hydrocarbons and fuel additives fefm the <br /> former southern UST#3 area. -knw <br /> v� <br /> • Proposed pilot boring MW-28 will be advanced approximately 7.0 feet east-southeast of <br /> existing well MW-1413, to monitoring dissolved fuel additives forfh the former norther I <br /> cluster UST area. J' l <br /> u <br /> As a contingency,AGE proposes the City of Stockton right-of-way sidewalk or street as an altefiiate <br /> location for well MW-27. The proposed location of well MW-27, is illustrated on Figure 2. <br /> l <br /> Al 6 <br /> Soil samples will�co ected from within the 8.25-inch hollow-stem augers at five-foot intervals 4 <br /> beginning at 40'feet bsg using a California split-spoon sampler and brass sleeves.The sampling will f_ S W l <br /> be conducted to insure proper installation of the well screen across permeable sediments. Selected S a 1 <br /> soil samples may be analyzed by a California Department of Public Health (CDPH)-certified <br /> laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and selected soil for total <br /> petroleum hydrocarbons quantified as diesel(TPH-d)in accordance with EPA Method 8015 <br /> Modified, <br /> • Volatile aromatic hydrocarbons: benzene, toluene, ethyl benzene and total xylene (BTEX) <br /> and Oxygenated compounds: di-isopropyl ether(DIPE), ethyl tertiary-butyl ether(ETBE), <br /> Advanced GeoEnvironmental,Inc. <br />