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Rainwater Carwash -4- . May 7, 2008 <br /> Claim No. 14719 <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below: <br /> Claim 14719 <br /> 160000 <br /> 140000 <br /> 120000 <br /> 100000 NW-2 <br /> w 80000 <br /> ro 60000 t UN-6 <br /> 40000 <br /> 20000 <br /> 0 <br /> (P 03 Oa Oa 00 00 06 00 01 01 <br /> 40 5eQ �a� �yQ tSa� 5eQ �a� 5zQ �a� �eQ <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within Yz mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station, car wash <br /> B. Site History: the extent of groundwater contamination is Ly defined to the <br /> northwest C 41-'-A <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: groundwater extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: This site has 47 monitoring points. Trends have been long <br /> established for these wells and the Fund recommends the Responsible Party <br /> reduce the monitoring frequency of many of these nested wells. The Fund also <br /> recommends that the San Joaquin County LOP direct the Responsible Party to <br /> add an additional remedial technology to achieve Water Quality Objectives more <br /> rapidly. The Fund will review this site next year to track progress. <br /> KA Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> California Environmental Protection Agency <br /> • <br /> 0 Recycled Paper <br />