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CLEARWATER <br /> G R O U P, [ N C <br /> ' • <br /> Background hydrocarbon vapors in air samples from MW-4, MW-5, MW-6, VW- <br /> 1, and VW-2; measurements were made using a lower explosion limit (LEL) <br /> meter and a photoionization detector (PID) <br /> • Background vacuums in MW-4, MW-5, MW-6, VW-1, and VW-2 using a <br /> magnehelic gauge which measures vacuum in inches of water. <br /> Tests were conducted using a vapor-extraction internal combustion (IC) engine; <br /> vapors are extracted by the engine vacuum and abated by engine combustion <br /> Clearwater received a letter of approval to conduct the SVE test from the San <br /> Joaquin Valley Unified Air Pollution Control District (APCD) <br /> SVE tests were conducted on VW-1 and VW-2 in the following manner <br /> • VW-1 and VW-2 were step-tested at applied vacuums of 10, 30, and 60 inches of <br /> water for approximately one hour at each vacuum level <br /> P • Flow volume was monitored at each vacuum level and recorded in actual cubic <br /> feet per minute (ACFM) <br /> • Induced vacuums were monitored at intervals of 5 to 10 minutes in MW-4, <br /> MW-5, MW-6, and the other SVE well <br /> ' • <br /> During the test, air samples collected from the SVE well being tested were 1 <br /> monitored for organic vapors using the LEL meter and the PID <br /> • At the end of the last step test, an air sample was collected from the SVE (well; <br /> being tested and the sample was analyzed for BTEX and TPHg. <br /> 1 � � I <br /> Air Sparge Pilot Test <br /> I ' I The initial plans for the pilot test included extractingvapors from VW-1 and VW-2 <br /> during the air sparge test of SW-1 and SW-2 However,r,the IC I <br /> ' the start of the air sparge test With approval from Ahe APCD; Clearwater pconducted; <br /> I I s I I I 11 ° <br /> air sarge,tests without extracting vapors,from VW-1 and VW-2. <br /> III I . I 111 .I I III , I I� I , <br /> ISI , Prior Itol Ibeginning,, the ir y sparge test,, ,dissolved ox gent was measured inl l al l <br />'I groundwater sample frkom I aeach well'at lthe site:l e, <br /> pg The air's ar test was conducted in <br /> 1� I,I ' VI III II `1111 if1 I II' II F'It I <br /> I'll �'r1 I I', I It I,I G <br /> ,, I `11 I I fl f I I 111 <br /> 1 I I III <br /> I I I I <br /> E�D1011PAR/3Q/PILOT, <br /> 7 <br /> � i1 I i i � "t�'11�111 I'11114, �I,�� �'�III �Illrl.11u�'I�Ilulll'�IIIi��� of I ��'ll �`u'I!`Illd'I II I�'�I'IIIiV�l11d11 I � IIEfAIiY 11iIFIl�11�f'(III1fIIticli,i'IIII���1' 1�11�1,� I�I <br />