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a <br /> AtutA�' 3q 3 . Y -. �µ 'L "f:' p 6J" �p - J.�'�l.h�.. .Y�� .4��4•'{•�k!"�y -� 1 �' � 6'i��S <br /> +i' �:� ,.p".S�n.. � � � �,� _ r :� ��•. y� .� � .:�. � "�, '`iii "�7iriri° �a u =F",A�' � <br /> 1.r. <br /> i RLEINFELDER <br /> S�F <br /> u , 2 BACKGROUND <br /> i <br /> Tht: Nomeliini Construction facility is at 1045 West Charter Way in Stockton, California <br /> (Plate 1). In August 1988, two 1,000-gallon fuel USTs were excavated from site southeast <br /> of the warehouse building while a 550-gallon waste oil tank was excavated from a separate <br /> site. Nomellini Construction reported that the two 1,000-gallc.i tanks contained regular <br />' and unleaded gasoline, but may have also held kerosene at one time. Analytical results of <br /> soil samples collected beneath the two 1,000-gallon USTs indicated that petroleum <br /> hydrocarbons anO gasoline related constituents were present in the soil. Constituents were <br /> detected below levels of concern in the sample. collected beneath the waste oil tank. <br /> Results of thi-- investigation were presented in a Kleinfelder report dated September 22, <br /> 1988. Based on these results, Meinfelder was authorized by Nomellini Construction to <br /> further assess petroleum hydrocarbon contamination in the vicinity of the UST excavations. <br /> -ecv ti it SSmnt <br /> On November 9, 1988 additional soil was removed from the fuel tanks excavation to further <br /> assess the extent of petroleum hydrocarbon,contamination. One section of the excavation <br /> bottom was removed from a depth of 11 to 19 feet below the ground surface. Soil samples <br /> were qualitatively screened in the field with an organic vapor detector. Organic vapor <br /> readings were detected at 408 parts per million by volume (ppmv) from a sample collected <br /> i at a depth of 19 feet within the excavation and 740 ppmv from a sample collected 10 feet <br /> away from the excavation at a depth of 16 feet. Based on the positive organic vapor <br /> screening results, Nomellini Construction decided to llAck£fll 1hG Y�tt1Ci �vi�,' ,cleaa° i1f <br /> and further assess the extent of contamination with a soil boring program. <br /> i- <br /> a� E;eliminary Soil BoriltgAssessmen <br /> In May 1989,Kleinfelder analyzed 15 soil samples collected from nine borings (BI through <br /> B-9)drilled in the vicinity of the UST excavation (Plate 2). Samples were analyzed from <br /> depths of 10.5 to 26 feet. Total petroleum hydrocarbons (TPH)were detected in 10 of the <br /> �-' 15 samples analyzed. High TPH as gasoline, benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) concentrations were detected just above and below the ground water surface in <br /> boring B-1 located adjacent to the south edge of the excavation. Similarly, high TPH <br /> concentrations were detected just above the ground water surface in B-2 approximately 20 <br /> F18-91-52 2 <br /> Copyright 1991 Kleinfelder, Inc. <br />