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AAAMF Ami Acini <br /> &Associates,Inc. JAN 24 2013 <br /> January 22,2013 ENVIRONMENTAL HEALTH <br /> PERfJdT/SERVICES <br /> Johnny Yoakum <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton,California 95205 <br /> Phone: (209)468-3147 <br /> Fax: (209)468-3433 <br /> Email:JYoakum(iDsicehd.com <br /> RE Former Rainwater Car Wash Facility <br /> 420 West Yosemite Avenue,Manteca,California 95336 <br /> Leaking Petroleum Underground Storage Tanks Environmental Case <br /> Central Valley Regional Water Quality Control Board (CVRWQCB)Case No.390835 <br /> Global ID T0607700663,UST Fund No. 14719 <br /> Revised Well Permit Application Submittal for MW14A/B,MW15A/B,MW16A/B and MW17AB <br /> Ref: SJCEHD Well Permits SR-65997 through SR-65999,Issued on 10-25-12 <br /> Dear Mr. Yoakum, <br /> Pursuant to your recommendations, we have elected to revise the well construction and design for the subject project. <br /> As you know, we received from your office approved well permits for installing four dual-nested groundwater <br /> monitoring wells MW 14A/B, MW 15A/B, MW 16A/B and MW 17A/B. A copy of these permits is attached for your <br /> reference. <br /> The revisions we are making to the well construction are to change the wells from dual-nested wells as currently <br /> permitted to two separate split wells which will be located next to each other and each having a different screen <br /> interval and depth. This revised design will avoid the higher costs to abandon and remove the wells when the time <br /> comes to close the case. <br /> The dual-nested well construction involved installing one 2"casing to a depth of 30 feet below ground surface (bgs) <br /> screened from 10 feet to 30 feet bgs and one 2"casing to a depth of 70 feet bgs screened from 55 feet to 70 feet bgs <br /> in a 12"diameter borehole. <br /> The revised well construction we are proposing involves installing one shallow well with a 2" diameter casing to a <br /> depth of 30 feet bgs screened from 10 feet to 30 feet bgs in a 10"diameter borehole and installing a second split well <br /> adjacent with a 2"casing to a depth of 70 feet bgs screened from 55 feet to 70 feet bgs in a 10"diameter borehole. <br /> As such, we will now propose to install 8 split wells (MW14A, MW14B, MW15A, MW15B, MW16A, MW16B, <br /> M W 17A,and MW 17B). The"A"designated wells are the shallow wells and the"B"designated are the deep wells. <br /> 4130 Cahuenga Blvd.,Suite 113. Los Angeles, CA 91602 <br /> Phone 818.824.8102. Fax 818.824-8112.www.amiadini.com . mail@amiadini.com <br />