Laserfiche WebLink
W Graffigna Jr. and Vvr main Graffigna -4- May 2, 2011 <br /> Claim No. 13578 <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: active retail gasoline station <br /> B. Site History: the extent of groundwater contamination is undefined to the south <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction and batch extraction <br /> E. Contaminant Exposure Pathway Evaluation: according to the consultant to <br /> the Responsible Party, vapor migration risks have been mitigated by soil vapor <br /> extraction <br /> F. Recommendation: <br /> In May 2008, the Fund recommends that the San Joaquin Valley LOP should <br /> direct the Responsible Party to assess the potential for air or oxygen sparging to <br /> achieve Water Quality Objectives more rapidly. The Fund will review this site <br /> next year to track progress. <br /> UPDATED, May 2009, current remediation techniques are no longer effective. <br /> The Fund recommends that the San Joaquin County LOP direct the Responsible <br /> Party to assess alternate remedial technologies and implement a cost effective <br /> approach that will achieve Water Quality Objectives in a timely manner. The <br /> Fund will review this site next year to track progress. <br /> UPDATED, May 2010, the Fund recommends that the San Joaquin County LOP <br /> direct the Responsible Party to implement an alternate (additional) remedial <br /> technology that will achieve Water Quality Objectives in a timely manner. The <br /> Fund will review this site next year to track progress. <br /> UPDATED, April 2011, water quality objectives have been achieved through <br /> active remediation. Minor remaining residual hydrocarbons are unlikely threaten <br /> human health or the environment. The Fund recommends that the San Joaquin <br /> County LOP review this site for closure. <br /> KA Larson, P.G. Date [Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> C,'aMbrnia Enironmental Protection Agenc}' <br /> Cli Rer. cled Paper <br />