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Addendum to Quarterly Groundwater Monitoring Report and Remediation Status Report dated August 21,1995 Moore Petroleum, 1399 E Yosemite Ave,Manteca,CA September 15, 1995 Page 3 The carbon adsorption system was initially configured to extract vapors from MW-lB Vapor samples were collected from the system influent and effluent on July 5, 1995 to demonstrate compliance with SJVUAPCD Permit The vapor samples were submitted,under chain-of- custody,to Sparger Technology, Inc , of Sacramento, Callforma, a state-certified analytical laboratory The samples were analyzed for total petroleum hydrocarbons, as gasoline (TPHg), and benzene, toluene, ethylbenzene and xylenes(BTEX) Both the influent and effluent vapor samples reported below detection limits for TPHg and BTEX On July 18, 1995 the horizontal piping was configured into the vapor extraction system such that vapors were being extracted from both the horizontal piping and MW-1B On July 25, 1995 vapor samples were collected for analysis from MW-1B and also from the horizontal piping Both samples indicated below laboratory detection limits for TPHg and BTEX Upon receiving the analytical results from this vapor sampling event, the carbon adsorption system was turned off on August 4, 1995 At this time, the vapor extraction system was pulsed on periodically and monitored with a flame ionization detector(FID)in an allempt to remove any remaining hydrocarbons in the soils • Analytical results and chain-of-custody forms from both of these sampling events are included as Attachment 3 To date, the combination of both vapor extraction systems have extracted a total of 11 pounds of TPHg and 0 098 pounds of benzene since December 6, 1994 A summaryof mass extraction rates based on laboratory analytical results are included in Table 3 TABLE 3 SUMMARY OF MASS EXTRACTION RATES BASED ON LABORATORY ANALYTICAL RESULT DATE FLOW ANALYTICAL RESULTS EXTRACTION RATES CUMULATIVE RATE TPHg Benne TPHg Ben=o TPHg Benzene NOTES (SC ) Ida (lb/day) 12/07/94 22 I40 22 027 06043 0 2 t 00032 Sande coDected from MW-I B 02/24/95 16 160 ND 023 0 11 0 098 Sample co➢ected from Mw-1 B 07/05/95 51 ND ND 0 0 11 0098 Sample co➢ectedfrom MW-1B 07125/95 92 ND ND 0 0 11 0 098 Sample collected fromhonmmtal ptpmg 07/25/95 92 ND ND 0 0 11 0098 Sample collected from MW-1B s