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r <br /> File No 20-3941-01 E01 �n KLEINFELDER <br /> April 2, 199 7 <br /> r <br /> 3 BACKGROUND <br /> r <br /> The area of the intersection of California State Highway 120 and McHenry Avenue is scheduled <br /> for an improvement project which involves the rerouting, widening, and realignment of Highway <br /> 120,and other miscellaneous improvements to both roadways <br /> r <br /> ' 3.1 EZ-Gas Mimi-Mart <br /> Kleinfelder has conducted a limited environmental subsurface investigation for the Highway <br /> 120/McHenry Avenue improvement project (Kleinfelder File No 20-3941-01 E01 report dated <br /> August 20, 1996) During that project, elevated portable photoionization detector readings <br /> were discovered in our bonngs on the EZ Gas Mini-Mart site <br /> rOn February 13, 1997, a Kleinfelder field geologist advanced a single boring an angle at to a <br /> depth of 18-1/2 feet by means of a hand auger The boring was advanced to a depth beneath the <br /> "center tank" on site During the advancement of that boring (Boring AB-1) soil samples were <br /> collected from depths of 5, 10, 14, and 18-112 feet below ground surface The samples obtained <br /> r from depths of 14 and 18-112 feet were submitted for chemical analysis Total Purgeable <br /> Petroleum Hydrocarbons were detected in both samples However, the concentrations attenuated <br /> from 180 mg/kg to 3 4 mg/kg between the 2 sample depths The results of that limited sampling <br /> ' were detailed in Kleinfelder's revised proposal for the EZ-Gas site (File No 20-3941-01 E01 <br /> report dated March 6, 1997) Because of the concentrations present in the samples, Caltrans <br /> District 10 requested that additional sampling be conducted That scope of work was detailed in <br /> rthe revised proposal discussed above The results of that investigation are detailed in this report <br /> r3.2 ARCO Mini-Mart <br /> r Kleinfelder has conducted a limited environmental subsurface investigation for the Highway <br /> 120/McHenry Avenue improvement project (Kleinfelder File No 20-3941-01 E01 report dated <br /> August 20, 1996) During that investigation, Boring B-1 was advanced at the ARCO Station at <br /> ' 1305 Escalon Avenue The soil sample from a depth of 2 feet contained low levels of"lubricating <br /> oil" which may be representative of asphalt or asphalt leachate in the soil sample No detectable <br /> hydrocarbons were present in the sample obtained from 5 feet Kleinfelder recommended no <br /> further investigation or clean-up as a result of the hydrocarbons encountered in Boring B-1 <br /> 20-3941-01 E0112017RO05 Page 4 of 1] 01997, Kleinfelder Inc <br /> I <br />