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aquascience <br /> 1 - Enc. <br /> April 24, 2001 <br /> 1 Ms Dot Lofstrom <br /> San Joaquin Public Health Services <br /> Environmental Health Division <br /> 1 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br />' SUBJECT MARCH 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 /> During the month of March 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 /> I any issues such as system alarms or shut-offs ASE also performed <br /> maintenance procedures as necessary on all equipment <br /> SYSTEM OPERATION OVERYIE <br /> Carbon Chanaeout <br /> I Based on analytical results of water samples collected after each <br /> granulated activated carbon (GAC) canister, it was not necessary to <br /> Iperform a carbon changeout during the month of March <br /> HYdrocarhon &reakth.rounh. <br /> Based on analytical results of the water sample collected from GAC #1 on <br /> Frank's One Stop Remediation System Monthly Report — March 2001 <br /> I 1 <br /> 208 W El Pintado, Danville, Cohfomia 94526 • 925-8249391 Fax 925-837-4853 <br />