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A- 9,006 -049 <br />$� 21 Technology Drive <br />Irvine, CA 92618 <br />949-727.9336 PNo <br />949.727.7399 F.4k <br />www.TRCsoIutions.cc.,n <br />November 20, 2007 <br />City of Santa Ana <br />P.O. Box 1988 <br />Santa Ana, California 92702 <br />ATTN: MINDY LY <br />SITE: SANTA ANA FIRE STATION NO. 6 <br />950 WEST MACARTHUR BOULEVARD <br />SANTA ANA, CALIFORNIA <br />RE: COST PROPOSAL TO PERFORM ALTERNATING WEEKLY <br />GROUNDWATER WELL PURGING FEASIBILTY TESTING <br />Dear Ms. Ly: <br />TRC submits this cost proposal to perform alternating weekly groundwater well purging <br />feasibility testing at the above referenced site. This cost estimate has been prepared in <br />response to the California Regional Water Quality Control (RWQCB) Board letter dated <br />November 6, 2007 (attached) approving the recommendation that limited remediation be <br />continued at the site. Six additional groundwater over purge events will be conducted. This <br />limited feasibility testing will recover groundwater from four onsite and one offsite wells to <br />evaluate the effectiveness of this method to reduce groundwater contamination <br />concentrations. <br />PROPOSED ACTIVITIES <br />• Gauge depth to water in four onsite wells and one offsite well prior to the initiation <br />of each groundwater pumping event. <br />• Purge four onsite wells and one offsite groundwater monitoring well, MW -4 through <br />MW -7 and MW -8 on a bi- weekly basis for three months (6 groundwater removal <br />events). <br />• Evaluate depth to water in each well and determine if recharge warrants additional <br />groundwater recovery from one or more of the wells. <br />• Collect and dispose of non - hazardous purged groundwater at an approved recycling <br />facility. <br />