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Morita Brothers Service Station 16 November 6, 1992 <br /> 3 4 Chemical Analysis of Soil and ,Groundwater Samples <br /> Soil samples were sent to a State of California certified laboratory Based on field <br /> observations, soil samples collected from immediately above the groundwater surface <br /> at a depth of 55 feet, as well as soil samples collected from ten feet below the <br /> groundwater surface in the underlying aquitard at a depth of 65 feet below surface <br /> grade from all three of the monitoring wells were submitted for laboratory analysis <br /> The soil samples were analyzed for TPPH as gasoline, and the gasoline constituent <br /> volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX) by the <br /> ' California DHS LUFT Method (5030/GCFID), and USEPA Test Method 5030/8020, <br /> respectively as well as for total lead by USEPA Test Method SW-6010 <br /> tThe three groundwater samples as well as a travel blank and a field blank were <br /> analyzed for TPPH as gasoline, and BTEX by the California DHS LUFT Method <br /> (5030/GCFID), and USEPA Test Method 5030/8020, respectively as well as for Total <br /> Recoverable Petroleum Hydrocarbons (TRPH) as oil and grease by USEPA Test Method <br /> 418 1, total lead by USEPA Test Method SW-7421, and soluble lead by USEPA Test Method <br /> SW-7421 <br /> 4.0 RESULTS OF GROUNDWATER ASSESSMENT <br /> 4. 1 Subsurface Conditions <br /> Subsurface material encountered was alluvium to the total depth of each boring The <br /> alluvium was characterized by low to moderate permeability, loose, light brown, very <br /> silty, very fine- to medium- grained sand (SM/ML) to a depth of 13 feet, overlying <br /> moderate to highly permeable, loose, dark brown, silty, fine- to medium- grained <br /> sand (SM) to a depth of approximately 27 feet Underlying this is a zone of <br /> consolidated, slight to moderate plasticity, medium dense, low permeability, gray <br /> brown, silty, organic clay (OHTML) to a depth of 53 feet This clay zone was underlain <br /> by consolidated, slight to moderate plasticity, medium dense, low permeability, light <br /> brown, trace very fine sand, minor silt, clay (CH) to a depth of 57 feet Between the <br /> depths of 57 feet to 61 feet is a consolidated, slightly dense, moderate to low <br />' EB-8101-3 9210-EO55 RPT <br /> l� _ <br />