SITE INFORMATION AND CORRESPONDENCE FILE 1

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s King Island Resort page 2 11530 W . Eight Mile Rd , Stockton . fff Additionally, your consultant concluded that TPHd in ground water has declined significantly towards zero detection and added that limited petroleum hydrocarbon contaminants, including TPHg and MtBE , remain mobile and undefined . Although there was a discussion of additional site assessment in the SCM which included installation of additional monitoring wells and conducting an air sparge test, a work plan was not included in the SCM. The SCM also discussed potential exposure pathways that may be present at the site. Discussion of the pathways were limited to only direct contact with the soil or ground water at the site , such as digging or excavations from construction activities , that would present a threat to humans. Please evaluate the potential for vapor intrusion to current or future buildings and submit the report of finding to the EHD immediately. The construction specifications of the ART wells were not included in the CAP as requested by the EHD . If it is still your plan to incorporate the ART well technology, please submit exact well construction diagrams and narrative descriptions that clearly describe and show the dimensions of the ART wells . The screened interval of the casing , the diameter of the borehole, as well as all of the devices to be installed in the casing is to be included . Documentation (data from sites with similar characteristics that show the remediation was effective or regulatory agency letters) that ART has been successfully used in the Central Valley area should also be submitted . The concentration of MtBE in the ground water samples collected from MW-5, MW-6 , and MW-7 indicate that the plume is unstable and continues to be a threat to the drinking water well located just over 100 feet from the plume. In its April 7, 2006 correspondence, the EHD required interim remediation to be conducted at this site . As i of the date of this letter, an interim remedial action work plan has not been submitted to the EHD . i Ozone injection was discussed in the EHD's April 7 , 2006 letter and you were advised that prior to enacting an interim remedial action that includes ozone injection , a bench scale test is required . You were advised to submit the proposal for the bench scale test to the CVRWQCB for their review and Waste Discharge Requirement (WDR) evaluation . The CVRWQCB will comment on your bench scale test. Once the bench scale test has been completed and results have been submitted to the CVRWQCB , they will determine any WDR. The Plan was a report of findings for CPT- 1 through CPT-3 installations completed onsite during August 2004. At that time , laboratory data from the grab ground water below round surface (' bgs) CPT 1 at 82 feet sample collected in the MW 6 area from 9 I ndicated that MtBE was not detected . Additionally, the grab ground water sample collected from CPT-2 at 105' bgs supported the conclusion that MtBE was not present near the domestic drinking water well at this depth . MtBE was detected in the grab ground water samples from CPT-2 at 22' bgs and from CPT-3 at 57' bgs. i