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Upgradient Environmental Consultants October 31, 1996 Mr Ken Gilkes Gilkes Trucking P O Box 8303 Stockton, CA 95208 N 0 V -4 1996 s Subject: Gillies Trucking ENVIRONMENTAL HEALTH Problem Assessment Report PERMITISERVICES 3931 Newton Road Stockton, CA Dear Mr Gillies a Upgradient is pleased to inform your that we have completed our analysis of the data that were obtained m August and October at the Gillies Trucking facility The new data have made it possible to revise and expand the preliminary Third Quarter Report that was submitted on September 17 By fully integrating the new data with the data that were obtained in earlier phases of the investigation, we have been able to go beyond the original scope of work and prepare a Problem Assessment Report (PAR) that conforms to the standards required by the Central Valley Regional Water Quality Board Problem Assessment Reports are intended to be very detailed and thorough characterizations of those underground tank sites that involve groundwater contamination Central Valley Board policy requires that such reports be submitted before proceeding to site remediation or requesting case closure with no further action By preparing the PAR at this time, we are optimistic that San Joaquin County Environmental Health will accept our conclusion that the site has been sufficiently characterized to move beyond site assessment to the next stage We believe that it is appropriate at this time to perform a risk analysts to determine whether the case can be closed under the Board's"low-risk" guidelines, but we will wart for a written response to this report from PHS/EHD before proceeding with any further work Copies of this report have been transmitted to Mr Steve Sasson at San Joaquin County Public Health Services and Miss Elizabeth Thayer at the Central Valley Regional Water Quality Control Board We recommend that you include a copy of the Executive Summary with your reimbursement request to the State Underground Tank Fund All that remains to be done to complete the scope of work authorized in proposal 96008 is to perform the fourth quarter groundwater monitoring Unless directed otherwise by Mr Sasson, we plan to monitor the site in early December and complete the report by the end of the year By that time, there will be several 55-gallon drums of purge water stored along the south side of the property We suggest that you authorize us to transfer this water by vacuum truck to a licensed disposal facility at that time We will submit a cost estimate for this in late November so that you may obtain pre-approval from the State Fund The charges for several items exceed the proposal amounts because of the expanded scope of work To clarify the revised charges for you and for the UST Fund, we have itemized the changes on 4111 82nd Street 3369 Kimberly Road Sacramento, CA 95826 Cameron Park, Cir 93682 (916) 452-2891 (916) 677-3055 Fant 4571817 Fax 677-3055