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aqua science <br /> M w6wl I" - . cngineer� Inc. <br /> March 19, 2001 -' <br /> Ms Dot Lofstrom <br /> San Joaquin Public Health Services <br /> Environmental Health Division <br />' 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br />' SUBJECT FEBRUARY 2001 REMEDIATION SYSTEM EFFECTIVENESS <br /> REPORT <br /> Frank's One Stop Service Station <br />' 2072 West Yosemite Avenue <br /> Manteca, California <br /> Dear Ms Lofstrom <br /> On September 29, 2000, Aqua Science Engineers, Inc (ASE) started an <br /> interim groundwater remediation system at the subject site to control the <br /> off-site migration of petroleum hydrocarbons identified in the on-site <br /> groundwater See the ASE "System Installation Report," dated October 2 , <br /> 2000 for complete details regarding the system's installation and start-up <br /> SITE VISITS <br /> I During the month of February 2001, ASE generally visited the site for <br /> operation and maintenance activities on Mondays, Wednesdays, and <br /> Fridays As detailed on the Groundwater Extraction System Daily Field <br /> IData Log, attached in Appendix A, ASE noted the date, time, total gallons <br /> treated, the vacuum influence on each recovery well, and commented on <br /> any issues such as system alarms or shut-offs ASE also performed <br /> maintenance procedures as necessary on all equipment <br /> SYSTEM OPERATION OVF.RVIF,W <br /> Carbon C hangeout <br /> On February 16, 2001, GAC vessels #1 and #2 were re-charged with a total <br /> of 4,000 pounds of virgin coconut shell 12 x 30 mesh activated carbon <br /> This task was performed due to the breakthrough of MTBE and TBA in <br /> these two vessels observed during January and early February 2001 The <br /> spent carbon was removed by the new carbon supplier, Barneby Sutcliff <br /> The flow of contaminated groundwater was then re-routed so that the n e w <br /> Frank's One Stop Remediation system Monthly Report — February 2001 <br /> 208 W E1 Pintodo, Donville, California 94526 s 925-820-9391 Fax 925-837-4853 <br />