Laserfiche WebLink
California gional Water Quality Con&l Board <br /> Central Valley Region Robert Schneider, ChairO&Z <br /> Linda S.Adams Arnold <br /> Secremryfor Sacramento Main Office chwarzenegger <br /> Environmental 11020 Sun Center Drive 9200,Rancho Cordova,California 95670.6114 p Governor <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 RECE VM D <br /> htip://www.waterboards.ca.gov/centralvalley <br /> OCT 2 2006 <br /> 29 September 2006 ENVIRONMENT HEWH <br /> PERMIT/SERMCES <br /> CERTIFIED MAIL NO. CERTIFIED MAIL NO. <br /> 7006 0810 0002 9651 1480 7006 0810 0002 9651 1497 <br /> Mr. Dennis Leikam Mr. Nick Musco <br /> Musco Family Olive Company Studley Company <br /> 17950 Via Nicolo 17950 Via Nicolo <br /> Tracy, California 95377 Tracy, California 95377 <br /> REVIEW AND COMMENTS OF GROUNDWATER MONITORING WELL INSTALLATION <br /> WORK PLAN, MUSCO FAMILY OLIVE COMPANY, SAN JOAQUIN COUNTY <br /> The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br /> Groundwater Monitoring Well Installation Work Plan (work plan) for the Musco Family Olive <br /> Company (Musco) received on 20 September 2006. The report was submitted in response to <br /> the Regional Water Board's order to submit technical reports pursuant to California Water <br /> Code Section 13267. The report was requested to address deficiencies in the Detection <br /> Monitoring Program (DMP) in the vicinity of the Class II Surface Impoundments. Final <br /> proposed groundwater well locations were agreed upon in a meeting with Regional Water <br /> Board staff and Musco on 14 September 2006. <br /> It is staff's opinion that Musco and the Regional Water Board are in agreement that the <br /> groundwater monitoring zone(s) at and around the class II surface impoundments need to be <br /> defined. This will hopefully prevent future questions on what water zones need to be <br /> monitored under detection monitoring program per Title 27 California Code of Regulations, <br /> Division 2 (Title 27). Staff's overall objective of this drilling program is to install a sufficient <br /> number of groundwater monitoring wells to comply with Title 27, Section 20415(B). Staff <br /> approves the work plan with the following conditions: <br /> The work plan has specific maximum depth for drilling for the shallow wells that may not <br /> be appropriate. The work plan describes that shallow well borings MW-19 and MW-21 <br /> will be drilled to a maximum depth of 70 feet below ground surface (bgs). Well MW-20 <br /> will be drilled to an approximate depth of 70 feet bgs. The target depth of all shallow <br /> wells is 70 feet bgs with a target screen interval of 50 to 70 feet bgs. The Discharger <br /> shall instruct field staff that screening the full thickness of the water-bearing zone may <br /> require drilling to a deeper depth below 70 feet bgs. However, based on the logs of <br /> MW-12, MW-17, and MW-18 this zone is likely to terminate at approximately 70 feet <br /> bgs. In any case the shallow borings should terminate above the gravel stratum <br /> identified at an approximate depth of 80 to 82 feet bgs. <br /> California Environmental Protection Agency <br /> pia Recycled Paper <br /> WDID#58392059001 <br />