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ENVIRONMENTAL HEALTHDEPARTMENT <br /> 'oPquini co SAN JOAQUIN COUNTY <br /> i. •y Unit Supervisors <br /> Q; Donna K.Heran,R.E.H.S. <br /> X Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> ' Douglas W.Wilson,R.E.H.S. <br /> • c9� F .,.R��P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> ®C l a!t Wr2M5 R.E.H.S. <br /> KYLE CHRISTIE ROSE V RODGERS TRUST ETAL <br /> ATLANTIC RICHFIELD COMPANY BILL & LORRAINE HALVORSON <br /> 6 CENTERPOINT DRIVE LPR6-161 10040 DAVIS ROAD <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 reviewed <br /> Work Plan for the Abandonment of a Groundwater Monitoring Well, Installation of <br /> an Interim Soil Vapor Extraction/Air sparge (SVE/AS) Groundwater Treatment <br /> System, and Installation of Groundwater Monitoring Wells—Addendum II <br /> (Addendum II) dated October 5, 2005, submitted on your behalf by URS <br /> Corporation America (URS) and has the following comments. <br /> Addendum II 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 submitted for the next scope of <br /> work for this site. <br /> URS is proposing the installation of four instead of three additional groundwater <br /> monitoring wells to more fully investigate the lateral extent of the groundwater <br /> plume in the downgradient direction. SJC/EHD approves this additional well. <br /> In Addendum I URS had completely changed the configuration of the proposed <br /> SVE/AS remediation well network, without explanation or technical justification, <br /> leaving the eastern portion of the property with no remediation wells. SJC/EHD <br /> requested justification for this change. In Addendum II URS stated that this <br /> modification was made at the request of ARCO to focus the interim remediation <br /> efforts on the known areas of impact. URS stated: "ARCO understands that <br /> based upon additional assessment in the eastern portion of the site, additional <br /> remediation may be required". The groundwater contamination at this site is <br /> currently undefined. 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 />