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i <br /> `r GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> 2006APR -7 AM11: 19 POOL ENGINEERING <br /> SAN Jt' CJrdT '! POST TENSION DESIGN <br /> ENYiRL)NNENTAL <br /> April 5, 2006 <br /> HEALTH I)Ellt RTMENT <br /> NOA Project Number: E06002A <br /> County of San Joaquin,Department of Environmental Health <br /> Attention: Lisa Medina <br /> 304 E. Weber Avenue, <br /> Third Floor <br /> Stockton CA 95202 <br /> Subject: Addendum to Surface&Subsurface Contamination Report <br /> 3231 East Spiess Road& 26609 St. Rt.West Frontage Road <br /> Acampo, CA 95220 <br /> Dear Ms. Medina, <br /> Per our conversation,I have attached additional information in regards to the historical manure ponds <br /> which were located on the norther portion of the property. <br /> Based on information provided by our client,the manure ponds were removed as part of the M.C.Silva <br /> Estates Construction Activities as requited by EHD and Public Works, see attached map (Tentative <br /> Parcel Map)for location of the estates. Based on information obtained from Public Works,the manure <br /> porlds were rrAiiired to he removed as part of the previous development and replaced with storm water <br /> retention ponds as drainage in the area was inadequate. <br /> Neil O.Anderson and Associates collected soil samples from the manure ponds on 08/03/2001 and <br /> again on 08/13/2001. These samples were sent to Precision Enviro-Tech for analysis for Nitrate as N, <br /> Soluble Solid,and TKN. The samples were collected from the manure ponds prior to and again after <br /> removal of the pond material. Analytical data from these dates are attached. Currently the area of the <br /> manure ponds(presently retention ponds)is approximately 15 feet lower in elevation then the souther <br /> portion of the parcels. In addition, the Flood Zone maps (attached) shows that the northern most <br /> portion of the property is possibly with in the 100 year flood zone area. <br /> In summary,based on the information provided, the manure ponds were removed in 2001 as part of <br /> the adjacent development with soil samples collected,and since 2001 the area has been in use as a storm <br /> water retention basin. <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 ■209.367.3701 0 209.369.4228 ■w .noandersonxom <br />