SITE INFORMATION AND CORRESPONDENCE

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10/04/88 15!32 12209451 11005 j September 21 , 1988- Page 4 Chevron U. S . A. hydrocarbons vapors discharged to the atmosphere without treatment . When this criteria cannot be met , the county requires an Activated Carbon Absorption System Treatment . The determination as to whether the exhaust stream meets that criteria would be assessed at such time as the system efficiency has been measured by the previously outlined. monitoring program . A permit from SJCAPCD was applied for and is currently being .submitted for the discharge . Within this permit application we are submitting we have nutlined a sampling sequence and monitoring procedures and p.t'otocols during the initial start up and the following months . It should be understood that the permitting process for airsbed discharges typically takes about. 4 weeks . Therefore , we propose Lo install the hardware portion of the remedial system upon your approt-al , however, , start-up of the system will be postponed until the actual permit, has been .received . We would a.pi7reciate your review of this proposed soil remedial system. We are seeking your approval for Phase I implemcntat:ion as soon as possible , since tho contractor is ready to re-install the tanks within the next few days . we feel_ the open excavation represents a cost reduction opportunity Lo the overall implementation of the remedial action. plan. Additionally, in our opinion, the installation of the Phase I system immediatly would be necessary to avoid the possibility of impending rains from seriously affecting the soA stability in the open excavation . Soil sloughing of the exc:vavation sidewallw already reprc_sents concerns for the performance of the ad,jacent building foundations . If you have any questions please do not hesitate to contract our office . Respectfully submitted, DAMES &s MOORE h Michael R . ,,win, RCE Senior. Geotechnical Engineer. MRE/sm Enclosures cc- : Chevron U. S .A. - Gordon Davitt.