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- Project No. 90161a Page 4 19 June 1990 le 1-1A co .lected from boring no. 1 revealed 640 Analysis of s ppm TPH Diesel. Analysis of sample 10-1A collected from boring amp no. 10 revealed 2200 ppm oil & Grease. The Tri-Regional Guidelines recommend further investigation detected. All other concentratins of 100 pp complete analysis registered below detection limits. Far analytical results see Appendix D. SUMMARY AND CONCLUSIONS um island Petroleum hydrocarbons were detected in the former pump and waste oil tank areas of the subject site. Several alternative follow up actions are possible. t , YOUNGDAHL & ASSOCIATES, INC. recommends: 1. A phase II drilling and sampling program to delineate the lateral and vertical extent of contamination. Followed by remediation if necessary (phase III) . Alternatives include: i„ 2. Perform a risk assessment by a qualified risk assessor to determine potential hazards and liabilities of detected hydrocarbon present. 3. Test for extent of hydrocarbon pthecconstrsenuction phase of remediation, if necessary, during the project. +: because YOUNGDAHL YOUNGDAHL & ASSOCIATES, INC. recommends a phase study, extent of hydrocarbon presence will need to be defined far almost will st all alternative actionati n.r1Constructiontwithout ocleanup 3may y need additional infosk assessm rm expose workers to hazardous conditions and will not likely be accepted by contractors or regulatory agencies. Leaving the site unremediated may pose a public health hazard and increase owners/users liability. Lenders and regulatory agencies may not contamination in place. accept leaving known Recovery of some of the cost of follow up work may be possible From the parties responsible for the hydrocarbon presence. _ YOUNGDAHL & ASSOCIkTES, INC. would be pleased easecontact to cussn at your submit proposals for follow-up convenience.