Laserfiche WebLink
Mr Ronald Rowe <br /> August 17, 1999 <br /> CAMBRIA <br /> Physical Property Analysis <br /> If the hydrocarbon mass remaining in soil and groundwater is too high for closure, then we will <br /> analyze one soil sample from each mayor lithologic unit encountered for permeability, porosity, <br /> density, and fractional organic carbon content <br /> Ground Water Monitoring Wells <br /> If the hydrocarbon mass remaining in soil and groundwater is too high for closure, then we will <br /> drill new wells immediately adjacent to existing wells MW-5 and MW-7, which currently have <br /> submerged screen intervals The well screens for the new wells will be based on the depth <br /> profiling for the dual-tube borings, but will likely be approximately 10 feet above and 10 feet <br /> below static water levels at the time of drilling The wells will be 2-inch diameter Schedule 40 <br /> PVC casing installed in 6-mch diameter hollow-stem auger borings Our standard procedures for <br /> wells and borings is included in Attachment E <br /> The sandpack will be placed 1-Foot above the top of the well screen followed by a 1-foot thick <br /> bentonite seal Each well will be secured with a locking cap under a traffic-rated well box <br /> Wellhead elevations will be surveyed to Mean Sea Level by a State of California licensed <br /> surveyor A well completion detail will be prepared for each ground water monitoring well <br /> Since we will have drilled continuous core borings during the dual-tube boring portion of the <br /> investigation, we will not sample the borings for the monitoring wells <br /> Existing wells MW-5 and MW-7 will be left in place for possible use as part of a well cluster <br /> Additional welts screened at other depth intervals may be proposed Construction of these wells <br /> will be dependent upon results of discreet soil and ground water sampling described above <br /> Details pertaining to these proposed wells and site investigation data supporting their installation <br /> will be submitted to SJCPHS for approval prior to installation <br /> Well Survey <br /> Delta conducted an area well survey that was included in their January 29, 1991 Final <br /> Remediation Plan The survey indicated that there were two water production wells within '/i <br /> mile of the site A municipal well owned by the City of Stockton was identified near the <br /> intersection of Lincoln and Worth Streets, approximately 1,800 ft north (down-gradient) of the <br /> site A well owned by the California Water Service Company was identified 2,500 ft Northeast <br /> (down-gradient) of the site <br /> 7 <br />