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06/23/2006 11:47 FAX 315 446 8053 BBL DIV - 2002/003 <br /> Now <br /> Yy <br /> ENVIRONMENTAL HEALTH DEPkRTMENT <br /> our" C6 SAN <br /> Donua K. Reran,R_R.HS. � `��� �fJl�l <br /> Director 304Eastti'�eberAvenue,Ti�udFloor tI►iuSupervisarr <br /> Carl Borgman,R.1:.H.S- <br /> ' Laarie A. Couilla, R_L.Ej,S. Stockto1,Califol is 95202-2708 Milo FiugginS,R.E.H.S_,R.D.I. <br /> . p•• Frog raA: l1it2ger <br /> • air " �'� Teiepborte:(209)468-3420 <br /> Douglas W.W r Bison_RF H:S. <br /> Margsrer Laaotio,RJB fi,5 ? <br /> Fax:: (209}464-0138 Robert mccletion, R.E.E.S. <br /> .Website:www.sfgov.a end/ JcHcarme-eco,R.E,H,s. <br /> - MAY 2 5 zoos <br /> CHRISTII+TE CORONEO STEPHAN•IR P RGAL <br /> SUTTER OFFICE CENTER — CHEVRON ENV MG}~Tr COMPANY <br /> 2001 UNION STREET #300 5001 BOLLINGER CANYON RTD <br /> SAN FRANCTSCO CA, 94123 ROOM K2240 <br /> SAN RAMON C.P. 94583 <br /> RE: Sutter Office Center SiTE CODE: 9327 <br /> 232 Suter Si:reet <br /> Stockton CA 95202 <br /> San Joaquin County Environmental Health Department(SJCfF_HD) has reviewed Monitoring Well <br /> Installation and Quarter!f Report—Third Quarter 2005(Report)dated December 8,2005 and <br /> Quarterly Report,Fourth Quarter 2005 dated February 28,2006 and has the following comments. <br /> The Raport documents the installation of two additional groundwater monitoring wells on site, <br /> MW-14 and MW-5. The wells were installed near the location of previous geoprobe borings'B'&`J' <br /> and cone penetrometer test(!CPT)boring CPT-2 to verity analytical results reported from <br /> groundwater samples Collected from the borings, and to model potential contaminant migration <br /> pathways at the site. Well MVV-4 intercepts first groundwater for investigation of the lateral extent <br /> of the shallow groundwater contamination-, MW-5 is a deep,discretely screened well for <br /> irvesd9ation of the vertical extent of the groundwater contamination. The Report recommends that <br /> the two new wells be surveyed for alevation. SJCIEHD agrees with this recommendation,please <br /> proceed with having the new wells surveyed to an established benchmark by a licensed surveyor_ <br /> Sample analyticafresults reported from the earlier geoprobe and CPT borings had indicated soil <br /> contamination extends to at least 40 feet below surface grade(bsg)in the northeast corner of the <br /> site near MW-1 and to a,least 30 feet bsg at the location of the new wells, and that groundwater <br /> contamination extended to approximately 150 feet bsg near MW-1 and to 185 feet bsg near MW-S. <br /> Samp!e analytical results reported from MW-5 over two quarters of groundwater monitorng and <br /> sampling do not confirm the previously reported groundwater cortamination. Results have been <br /> non-detect for all constituents analyzed. Please proceed with subrnittal of a feasibility study for <br /> remediation of the soil and groundwater contamination at this site_ The study is due for submittal <br /> no later than July 28,2006. <br /> If you have any questions please Call Lori Duncan at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Ldri`Duncan,Senior RENS Nuel C. Henderson, Jr., PG <br /> LOPISite Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc James Barton, CVRWQCB <br /> William Little,AGE <br />