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tf (M <br /> Fourth Quarter 1995 Quarterly Groundwater Monitoring&Remediation Status Report <br /> Moore Petroleum,Inc, 1399 E Yosenute Ave,Manteca,CA <br /> November 15, 1995 <br /> Page 3 <br /> ' The system was shutdown on March 21, 1995 due to low influent hydrocarbon levels The R S 1 <br /> unit was replaced with a 160 standard cubic feet per minute (SCFM)regenerative type blower <br /> which extracts soil vapors from either monitoring well MW-1B or a section of underground <br /> horizontal piping (HORIZ) and filters the vapors through two in-line 2001b carbon absorption <br /> filters prior to atmosphenc release The carbon absorption vapor extraction system was started <br /> ' on July 5, 1995 and operated continuously through August 4, 1995, at which time vapor <br /> hydrocarbons concentrations fell below laboratory detection limits <br /> Currently, the vapor extraction system is in a pulse mode where the system is turned on and vapor <br /> readings are recorded with a flame ionization detector(FID) on a monthly basis If petroleum <br /> concentrations are zero on the FID, then the system is turned off The purpose of this monthly <br /> ' pulsing is to extract any remaining hydrocarbon vapors in the surrounding soils, if any System <br /> operating data are contained m Table 2 of Attachment 3 Table 3 of Attachment 3 contains <br /> calculated daily extraction rates based on laboratory analytical reports for the vapor extraction <br /> ' system. Table 4A in Attachment 3 contains system pulse data from August 15, 1995, Table 4B <br /> contains system pulse data from September 19, 1995 and Table 4C contains system pulse data <br /> from October 16, 1995 Attachment 4 contains vapor extraction system sample calculations <br /> RECOMMENDATIONS <br /> ' All six monitoring well groundwater samples have not contained detectable levels of TPK as <br /> gasoline, or BTEX for the last two quarters All six on-site wells will be quarterly sampled for 2 <br /> more quarters If quarterly sampling results remain below laboratory detection hmits for TPH, as <br /> gasoline, and BTEX, Apex will then request site closure <br /> 1 <br /> 1 <br /> 1 <br />