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4 <br /> Dispenser Soil Sam_nlinIR <br /> ARCO Facility No.5450 <br /> Stockton,California <br /> Delta Project No.IA99-705 i <br /> Page 2 I <br /> aqueous solution of AlconoxTm detergent, rinsed with potable water, and rinsed again with distilled <br /> water. <br /> All soil samples were relinquished to Sequoia Analytical of Sacramento, California(Sequoia). Sequoia <br /> is an ARCO-contracted and California Department of Health Services (CADHS)-certified:laboratory. <br /> Delta and Sequoia adhered to strict chain-of-custody procedures from sample collection to sample <br /> analysis. Soil samples were analyzed for total purgeable hydrocarbons (C6-C12) according to <br /> CADHS Environmental Protection Agency" (EPA) Method 8015 and for benzene, toluene, <br /> ethylbenzene,'and total xylenes according to CADHS EPA Method 8020. Samples were analyzed for <br /> tent-butyl alcohol, methyl tert-butyl ether, di=isopropyl ether, ethyl tert-butyl ether, and tett-amyl <br /> methyl ether-according to EPA Method 8260A. Analytical results are presented in Table 1. <br /> Laboratory reports and chain-of-custody documentation are included as Attachment A. <br /> If you have any questions concerning this letter report, please contact Bryan Van Wagner at(949) 466- <br /> 9215. <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS,INC. <br /> Bryn Van Wagner,R.G. <br /> California Registered Geologist No. 5820 <br /> Attachments: Figure 1 Site Map with Sample Locations <br /> Table I Soil Sample Analytical Results f <br /> Attachment A Laboratory Reports and Chain-of-Custody Documentation i <br /> cc: Mr. Kyle Christie,ARCO Products Company,La Palma,California �I <br /> Mr.Vince Corsello,ARCO Products Company,La Palma,California <br /> Mr.Paul Supple,ARCO Products Company,Moraga,California <br /> Mr.Benjamin Heningburg,Delta Environmental Consultants, Sacramento, California <br /> BVw4ro(p:rpmjeds*ojeds.99199-70515450dstt.doc) <br /> I <br /> iq i <br />