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Quik Stop Station No 39 February 14 2003 <br /> Stockton California Results Re ort and Work Plan Addendum <br /> • northwestward to southwestward under gradients of 0 001 to 0 008 Fourth quarter 2002 <br /> data indicate a northeastward groundwater flow direction under a gradient of approximately <br /> 0 001 as shown on Figure 2 <br /> Typical quarterly groundwater analyses include total petroleum hydrocarbons as gasoline <br /> (TPHg), the volatile aromatic hydrocarbons benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), the seven fuel oxygenates methyl-t-butyl ether (MTBE), diisopropyl ether (DIPS), <br /> ethyl-t-butyl ether (ETBE), tert-amyl-methyl ether (TAME), tert-butanol (TBA), methanol <br /> and ethanol Additional groundwater analyses for total petroleum hydrocarbons as motor oil <br /> (TPHm) and the halogenated organic compounds JCA and 1,2-dibromoethane (EDB) were <br /> performed for the first and second quarter 2002 groundwater monitoring events Total lead <br /> and soluble lead analyses were performed on the quarterly groundwater samples for the first <br /> and fourthuarter 2002 events respectively <br /> q � p Y <br /> • ADDITIONAL SUBSURFACE INVESTIGATION <br /> The phase of this additional subsurface investigation consisted of collection of groundwater <br /> samples from the saturated zone at various locations and depths in order to appropriately site <br /> additional site monitoring wells The preliminary investigation phase was performed with a <br /> cone-penetrometer test (CPT) rig capable of generating a soil profile log and collecting <br /> discrete-depth groundwater samples from below the water table The CPT rig utilizes <br /> computer interpretation of soil parameter electronic data to generate a soil profile log The <br /> groundwater samples are collected with a hydropunch-type sampler Fieldwork was <br /> performed in accordance, where applicable, with the Horizon Field Methods and Procedures <br /> I <br /> (Appendix B) <br /> Well permit SR# 0032108 (Appendix A) was obtained from San Joaquin County <br /> Environmental Health Services to allow the advancement of the soil borings Gregg In Situ, <br /> Inc of Martinez, California (license #C57-656407) was retained to provide groundwater <br /> C Trojects170391141WPadd=2-03 doe <br /> Projeu No 7039 14 3 HORIZON ENVIRONMENTAL INC <br />