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r <br /> COUNT}/ Of SONOMA <br /> DEPARTMENT OF HEALTH SERVICES Mark A. Kostielney-Director <br /> !F <br /> Environmental Health Division <br /> Jonathan J.Ktug-Director <br /> March 1, 1995 <br /> J 199f- <br /> Ms. <br /> 99aMs. Frances Ferguson <br /> 7436 Meadow Avenue "snow. .. <br /> Stockton, California 95207 ' <br /> Re: 16383 Main Street, Guerneville <br /> [SCDHS-EHD Site #1473, NCRWQCS Site #1TS45441 <br /> Development of Leaking Underground Storage Tank Site <br /> Dear Ms. Ferguson: <br /> In response to requests to this Department to provide a letter of site closure or <br /> permission to develop the referenced site, I have reviewed the file and offer the following i <br /> comments. i <br /> development at sites where soil and ground water contamination has ' <br /> In general, property P � <br /> been reported may proceed as long as the development does not interfere with <br /> completion of the site investigation or remediation. <br /> With respect to the above referenced site, development of the property at this phase of <br /> the site investigation and cleanup appears very feasible. Although a small amount of <br /> contaminated soil exists at the extreme north end of the property, most of the <br /> contaminated soil at the site has been excavated and removed. The remaining soil may <br /> be too impractical to remove and may be left in place if shown that it is not contributing <br /> to further groundwater contamination. <br /> A continuing groundwater investigation on-site involves the sampling of five existing <br /> monitoring wells. Sampling must be done on a quarterly basis, but this procedure is <br /> generally non-obtrusive. 'Three monitoring wells are located in the north area of the <br /> parcel, one is on the east perimeter, and one is located at the southeast corner. <br /> Analytical results of groundwater samples have shown the presence of relatively low <br /> concentrations of hydrocarbons reported in the gasoline range. Monitoring wells may <br /> need to be properly abandoned to accommodate site development. I will work with <br /> Unocal regarding monitoring well relocation if this is necessary. <br /> Ss <br /> RPT Q� TRANSMITTAL ; <br /> x 4,561 <br /> roan ran Drivp. Suite A. Santa Rosa, CA 95403-2067 . phone (707) 525-6565 . {cY (707) 525-6525 ; <br /> cnn 'J W7 117 nTC:9gi q9 WINh1 INgh 9HIAMA 67:Ci fng9) 1h .11- 'tig4 <br />