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aqua science <br /> - .. �- I , " 1 engineers Ear. <br /> IDecember 15, 2000 <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 NOVEMBER 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 November 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 n T <br /> I <br /> Carbon Vessel Ban-Fouling <br /> I During the month of November 2000, the system automatically shut itself <br /> off four times due to the high-high level switch alarm on the transfer <br /> . tank This switch was becoming activated because water flowing through <br /> granulated activated carbon vessel #1 (GAC #1) was not able to flow at <br /> Frank's One Stop Remediation System Monthly Report — November 2000 <br /> 208 W El Pintodo, Danville, California 94526 e 925 820-9391 e Fax 925-837-4853 <br />