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aqua science <br /> w = . . engineers inc. <br /> M <br /> July 31, 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 JUNE 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 June 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 /> Data 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 OVERYIE <br /> The system was found to be off only once during the month, in the third <br /> week, due to a power failure The system operated continuously the <br /> remaining days of the month <br /> Carbon ChanjZeout <br /> Based on the analytical results of the weekly samples collected from the <br /> granulated activated carbon (GAC) canisters, a carbon changeout was <br /> Frank's One Stop Remediation System Monthly Report — June 2001 <br /> - 1 - <br /> 208 W E1 Pintado, Oanvdle, California 94526 925-820-9391 Fax 925-837-4853 <br />