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�i
<br /> B R 0 , W N A N D t `
<br /> �T ifICE
<br /> C A L D V E L L
<br /> f
<br /> March 1, 1996
<br /> Mr. Kyld Chnstie
<br /> ARCO Products Company
<br /> x Post Office Box 612530
<br /> San Jose,California 95161 017-2060-0111
<br /> ¢` Subjecr Fourth Quarter 1995 Groundwater Moni-toyy pg and Remediation System
<br /> Evaluation Report for ARCO Facihty�2 1.33, Stockton, Califdtinia,
<br /> Site Code 1021
<br /> Dear Mr:Chnstie
<br /> t>
<br /> This-report presents water-level measurements and results,of groundwater sampling performed
<br /> during the fourth quarter of 1995 at ARCO Products Company(ARCO) Facility 2133, located at
<br /> _ a► 2908 Benjamin Holt Dnve in Stockton, California ,Fieldwork was performed by EMCON
<br /> Associates (EMCON) on December 5, 1995 This report was prepared under Work
<br /> 3, Authorization No 8878-00
<br /> There are eleven on-site groundwater monitoring well&,(E-2 through E-6, E-9 through E-12,
<br /> MW-1, and MW-2), nine off-site groundwater monitoring wells (E-7, E-8, PR-1, PR-2, BHD-1,
<br /> BHD-2, and MW-3 through MW-5) and one on-site groundwater extraction well (R) as shown
<br /> on Figure 1 In addition, there are twelve soil vapor,extractton wells (V-1 through V-12) and
<br /> nine air sparging wells (S-1 through S-9) on-site Wells V-9/S-7 and V-10/S-8 are constructed
<br /> as dual-completion wells
<br /> This quarter, groundwater monitoring wells E-2, E-8, E-9, E-11, E-12, BHD-1, MW-4, and
<br /> MW-5 were sampled Well E-10 was not samplednl?,cau'se it contained approximately 0 37 feet
<br /> of free product Monitonng wells E-3, E-4, E 5;`�6;E-7; PR-1, PR-2, BHD-2, MW-1, MW-2,
<br /> and MW-3 are sampled on a semi-annual basis (first and,third quarters of each year)
<br /> sig Field,and Analytical Methods
<br /> t EMCON ,personnel measured depth-to-water and}product thickness (if present), purged each
<br /> well to be sampled, and collected groundwaterysamples at the site Before sampling, the wells
<br /> were purged of a minimum of three well casing volumes or until evacuated using a submersible
<br /> pump or bailer After purging, each well was sampled using a disposable bailer Field data
<br /> sheets,and chain-of-custody documentation are indluded in Exhibit A
<br /> b i t 1 L
<br /> This report was prepared in accordance with the standards of the environmental consulting industry at the time it%,as
<br /> prepared It should not be relied upon by parties other than those for whom it was prepared, and then only to the
<br /> extent of the scope of work which was authorized This report does not guarantee that no additional environmental
<br /> contaminatton beyond that described in this report exists at the site
<br /> Environmental`Engineering And Consulting Analytical Services 2060 R£PORTS\4TH95QTR DOC
<br /> 9616 kliCRws A%E',LE SLITS 600 SACRAMENTO CA 9 827 2627
<br /> (916) 444 0123 Fix (916) 856 5211
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