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{ <br /> F." <br /> ENVIRONMENTAL HEALTH D <br /> aUN EPARTMENT <br /> I off'--• -- .•� SAN J <br /> ' OAQUIN COUNTY <br /> c: a Donna K.Heran,R.E.H.S. <br /> Unit Supervisory <br /> Director <br /> 304 East Weber Avenue, Third Floor Carl$orgman,R.E.H.S. <br /> •'I AI Olsen R.E.H.S.c. Q Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> diiFo'R� Program Manager Telephone: 20 Douglas W.Wilson,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. ( 9) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> OCTlalc �5 <br />' KYLE CHRISTIE ROSE V RODGERS TRUST ETAL- <br /> ATLANTIC RICHFIELD COMPANY <br /> 6 CENTERPOINT DRIVE LPR6-161 BILL & LOHALVORSON <br /> 10040 DAVIS S RROAOA D <br /> LA PALMA CA 90623-1066 STOCKTON CA 95209 <br /> RE: Former ARCO Station #2168 SITE CODE: # 1056 � <br /> 441 W. Charter Way <br /> Stockton CA 95202 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has <br /> reviewed <br /> Work Plan for the Abandonment of a Groundwater Monitoring Well, Installation of <br /> an Interim Soil Vapor ExtractionlAir sparge (SVE/AS) Groundwater Treatment <br /> i System, and Installation of Groundwater Monitoring <br /> (Addendum II) dated October 5, 2005, submitted on our behalf by URS <br /> II <br /> FCorporation America (URS) and has the following comments. <br /> Addendum 11 was submitted in response to SJC/EHD correspondence dated <br /> September 26, 2005. SJC/EHD requested clarification of several issues in the <br /> Work Plan and Work Plan Addendum I originally <br /> work for this site. g Y s ubmltted for the next scope of <br /> URS is proposing the installation of four instead o <br /> three monitoring wells to more fully investigate the lateralext nt odflthe grtional oundwater <br /> Fplume in the downgradient direction. SJC/EHD approves this additional well <br /> In-Addendum I URS had completely changed the configuration of the proposed <br /> SVEIAS remediation well network, without explanation or technical justification, <br /> leaving the eastern portion of the property with no remediation wells. <br /> requested justification for this change. In Addendum it URS stated that this HD <br /> modification was made at the request of ARCO to focus the interim remediation <br /> efforts on the known areas of impact. U � tated: "ARCO understands that <br /> _ based upon additional assessrrtent in the eastern portion of the site, additional <br /> remediation may be required". The groundwater contamination at this site is <br /> currentlyundefined.ed. The most highly impacted well at this site was MW-4, which <br /> was the furthest east, or down gradient, well. SJC/EHD approves the changes to <br /> the SVE/AS well network with the condition that if further investigation documents <br /> contamination on the eastern portion of the site, additional remediation wells will <br /> be required to be added to the currently proposed interim remediation system. <br /> i t t <br />