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. Subsurface Conditions <br /> Three exploratory soil borings were advanced on-site at the locations shown on Figure 1 The <br /> pavements are underlain by salty clay to depths of about 12- to 14 feet This clay is in turn <br /> underlain by sandy clay and clayey sand to depths of about 20-feet These sandy strata may <br /> contain thin fine sand and clay interbeds several inches thick and compose the aquifer The <br /> boreholes were terminated at a depth of 21 5-feet into a clay strata which is assumed to be <br /> continuous aquitard under the site <br /> Groundwater was encountered in each borehole at depths of roughly 12-feet and is interpreted <br /> to be unconfined to weakly confined in this area Slow entry was observed in some boreholes <br /> The irrigation canal lust north of the site was filled with water and was flowing to the east The <br /> groundwater elevation data indicate an southwesterly direction of flow The low gradient was <br /> calculated at 0 014 <br /> Chemical Analysis and Results <br /> Nine soil and six groundwater samples were analyzed at Priority Environmental Laboratories, <br /> Inc in Milpitas, CA, a State certified analytical laboratories Samples were tested for the <br /> following, Total Petroleum hydrocarbons as Gasoline (TPHG), as Aviation Fuel (TPHA), as <br /> Kerosene (TPHK), Benzene (B), Toluene (T), Ethylbenzene (E), Xylene (X), Methyl-tertial- <br /> buytl-ether (MBTE) and Total Lead using EPA Methods 5030, 8015, 8020, 602 and 7420 <br />• The results are attached (see Appendix D) and listed below in Tables 1 and 2 <br /> TABLE 1 SOIL CHEMICAL DATA <br /> Sample TPHG TPHK TPHA Ben Tol Ethyl Xyl MBTE Lead <br /> No --------mg/kg------ ------------ug/kg------------------ mg/kg <br /> MW-1-2 ND ND ND ND NO ND ND ND 90 <br /> MW-2-2 ND ND ND NO NO ND ND ND 52 <br /> MW-3-2 ND 11 ND NO ND NO ND NO 45 <br /> Soil Stockpile ND ND ND ND NO NO ND ND ND <br /> Blank ND NO ND ND ND NO ND ND NO <br /> TABLE 2 GROUNDWATER CHEMICAL DATA <br /> Sample TPHG TPHK TPHA Ben Tol Ethyl Xyl MBTE Lead <br /> No ---------------------------ug/I------------------------- mg/kg <br /> MW-1 ND ND ND NO ND ND ND ND ND <br /> MW-2 ND ND 340 ND NO ND ND ND NO <br /> MW-3 ND NO ND ND NO ND ND ND NO <br /> Drum Water ND ND ND ND ND ND ND ND NO <br /> Blank ND NO ND ND ND ND ND ND ND <br /> • NO - Not Detected mg/kg - milligram per kilogram <br /> ug/kg - microgram per kilogram ug/I - microgram per liter <br /> Haley Wells Project No 4111 Page 3 <br />