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i 1 <br /> prepared for property also located at East Street and Grant <br /> Line Road that the subject intersection is located on <br /> (essentially ) level terrain underlain by Pleistocene and <br /> Holocene age-' flood plain deposits composed of sediments <br /> ' similar to, and probably conformable to underlying deposits <br /> of alluvium and the Tulare formation. <br /> ' The flood plain deposits are light to dark-brown and grey <br /> clay , silty sand, and organic materials with locally high <br /> concentrations of salt and alkali . Stream channel deposits <br /> of sand and gravel are also present . <br /> ' Groundwater is less than ten feet below grade throughout <br /> most of the Tracy area . Groundwater flow is generally to <br /> ' the north. The flood plain deposits of the shallow water <br /> bearing zone have well developed soil profiles and poor <br /> permeability . The base of this zone is poorly defined and <br /> probably is from five to twenty feet below ground surface . <br /> 1 <br /> OVERVIEW OF PAST ENVIRONMENTAL COMPLIANCE ACTIVITIES <br /> PERFORMED AT THE SITE <br /> In their March, 1993 Report of Findings , Applied <br /> Environmental Solutions , Inc (AES) of San Jose, CA <br /> indicated that detectable concentrations of Total Petroleum <br /> Hydrocarbons as Gasoline (TPH-G) , toluene, ethylbenzene, <br /> and total xylenes were present in a groundwater sample <br /> 1 acquired from monitoring well MW-2 . . one of three on-site <br /> groundwater monitoring wells . The analytical results <br /> reported by AES appear in Table 1 <br /> ' Detectable concentrations of fuel hydrocarbons were also <br /> present in soil samples acquired during the installation of <br /> ' monitoring wells MW-1 and MW-3 during July , 1991 , and in <br /> other soil samples acquired from the area formerly occupied <br /> by the underground gasoline storage tanks during July, 1989 <br /> and July, 1990 . <br /> ' Four soil borings were also advanced during during July of <br /> 1991 Soil samples acquired from these borings contained <br /> significant levels of fuel hydrocarbons (including 5 , 100 <br /> parts per million (ppm} Total Petroleum Hydrocarbons as <br /> Gasoline {TPH-G} and 2 ,000 parts per billion {ppb} benzene <br /> ' in SB1 at 9 feet , and 220 ppm TPH-G in SB2 ) . <br /> With the approval of Ms . Mary Meays , Senior PHS/EHD <br /> Environmental Health Specialist , EPM collected one <br /> groundwater sample from each of the existing groundwater <br /> monitoring wells (MW-1 , MW-2 , and MW-3) on June 7 , 1993 <br /> Additional samples were acquired on June 28 and 29, 1993 <br /> for the purpose of meeting quarterly compliance monitoring <br /> requirements . <br /> ' <br /> Page 2 <br /> s <br />