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Additional Sot]and Groundwater Investigation Report
<br /> Canepa s Car Wash(Park,Street)
<br /> July 12,2004
<br /> Page 4
<br /> 3 3 GROUNDWATER SAMPLING PROCEDURE
<br /> Twenty groundwater samples were collected for laboratory analysis from the five CPT/hydropunch
<br /> Paired borings between April 14 and April 19, 2004
<br /> IThe groundwater samples were collected directly from the outlet of the stainless steel bailer Water
<br /> samples were collected by filling four, 40-milliliter volatile organic analyses (VOA) vials The sample
<br /> containers were labeled for sample identification and placed in a cooler with ice The water samples were
<br /> delivered under chain-of-custody procedures to Argon Laboratories, Inc , in Ceres, California
<br /> 3 4 SOIL SAMPLING PROCEDURE
<br />' The soil samples collected from boring B2 for laboratory analysis were collected into clean, stainless
<br /> steel sleeves using a 12-inch piston actuated sampler The stainless steel sleeve was removed from the
<br /> bottom of the sampler, the ends covered with clean Teflon`s sheeting, sealed with plastic end caps,
<br /> labeled, and placed in a cooler with ice The soil samples were delivered under chain-of-custody
<br /> procedures to Argon Laboratories, Inc , in Ceres, California
<br /> 3 5 LABORATORY ANALYSES
<br /> The soil and groundwater samples collected from the soil and hydropunch borings were analyzed for
<br /> I total petroleum hydrocarbons quantified as gasoline (TPH-G) by EPA Method 8015M, benzene, toluene,
<br /> ethyl benzene, total xylenes (BTEX), and selected gasoline oxygenates/additives by EPA Method 8260B
<br /> The gasoline oxygenates/additives included MTBE, ethanol, tertiary-butanol, di-isopropyl ether (DIPE),
<br /> ethyl tertiary-butyl ether (ETBE), 1,2-dichloroethane (1,2-DCA), and tertiary-amyl methyl ether
<br /> . (TAME) The analytical parameters and detection limits are presented in Table 1 and Table 2 of Sections
<br /> 4 2 and 4 3, respectively Analytical laboratory certificates of analysis are included in Appendix C
<br /> 4 0 INVESTIGATION RESULTS
<br /> 4.1 FIELD OBSERVATIONS AND CPT RESULTS
<br /> Field observations made dunng the installation of the CPT and hydropunch borings consist of the CPT
<br /> stratigraphic logs of subsurface soil lithology, boring locations, and sample depths of the five
<br /> hydropunch borings and one soil boring Fugro's Report for Piezocone Penetration Testing and Related
<br /> Services, 248 East Park Street, Stockton, California (including the CPT3 through CPT7 soil behavior
<br /> type stratigraphic logs), are included in Appendix B Sample locations and sample depths are shown in
<br /> Figure 2, in Appendix A
<br /> CPT3 was advanced northeast of the site, on the north side of Park Street near the intersection with San
<br /> Joaquin Street Based on the CPT lithologic log, the boring encountered a relatively heterogeneous
<br /> stratigraphic package consisting of predominantly clay/silt/sand mixtures with sand and silt dominated
<br /> horizons from approximately 20 to 33, 48 to 59, 65 to 83, 101 to 130, and 144 to 150 feet bgs where the
<br /> CPT boring was terminated Stratigraphic horizons dominated by clay, which would likely impede the
<br /> vertical movement of groundwater, were encountered at depths of approximately 33 to 42, 59 to 65, 83 to
<br /> 100, and 135 to 144 feet bgs Discrete groundwater samples were collected at depths between 29 to 33,
<br /> 80 to 84, 106 to 110, 126 to 130, and 153 to 157 feet bgs from the paired hydropunch boring at this
<br /> location
<br /> CPT4 was advanced north of the site, on the north side of Park Street, west of CPT3 The CPT
<br /> stratigraphic log indicates that the lithology is dominated by clay and silt, with a significantly lower sand
<br /> �� CONDOR
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