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MW science <br /> - -- -, - engineers Inca <br /> -r1 <br />' August 28, 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 JULY 2001 REMEDIATION SYSTEM EFFECTIVENESS 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 t h e <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 July 2001, ASE generally visited the site for operation <br />' and maintenance activities on Mondays, Wednesdays, and Fridays As <br /> detailed on the Groundwater Extraction System Daily Field Data Log <br /> (attached in Appendix A), ASE noted the date, time, total gallons treated, <br />' the vacuum influence on each recovery well, and commented on any <br /> issues such as system alarms or shut-offs ASE also performed <br />' maintenance procedures as necessary on all equipment <br />' The system was found to be off twice during the month, once in the <br /> second week due to a power failure, and once in the third week due to a <br />' small crack in GAC vessel #1 The station owner turned the system off <br /> and called ASE to inform us of the situation The system operated <br />' continuously the remaining days of the month <br /> Carbon Changeout <br /> Based on the analytical results of the weekly samples collected from the <br /> I <br /> Frank's One Stop Remediation System Monthly Report — July 2001 <br /> - 1 - <br /> 208 W El Pinrado, Donville, Cahfornc 94526 - 925-820-9391 o Fax 925-8374853 <br />