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January 8, 2001 <br /> J1 <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 DECEMBER 2000 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 December 2000, ASE visited the site for operation <br /> and maintenance activities on Mondays, Wednesdays, and Fridays for the <br /> most part As detailed on the Groundwater Extraction System Daily Field <br /> Data Log, attached in Appendix A, ASE noted the date, time, total gallons <br /> treated, the vacuum influence on each recovery well, the depth to water <br /> in two of the five recovery wells, and commented on any issues such as <br /> system alarms or shut-offs ASE also performed maintenance procedures <br /> as necessary on all equipment <br /> SYSTEM OPERATION OVERVIE <br /> i <br /> Carbon Changeout <br /> On December 13, 2000, GAC vessel #1 was re-charged with 2000 pounds <br /> of virgin coconut shell 12 x 30 mesh activated carbon The spent carbon <br /> was removed by the new carbon supplier, Barneby Sutcliff The flow of <br /> . contaminated groundwater was then re-routed so that the new carbon <br /> vessel was placed in the GAC #3 spot <br /> Prank's One Stop Remediation System Monthly Report -- Dec,ember 2000 <br /> - 1 - <br />