Laserfiche WebLink
S E C 0 R <br /> Mr Ed Ralston <br /> February 12, 2003 <br /> Page 4 <br /> • Well Surveying Newly Installed wells were surveyed by Morrow Surveying, a licensed <br /> surveyor for locations and well elevations relative to mean sea level and geoprobe borings <br /> were survey for location only on November 21, 2002 Well survey data is presented in <br /> Attachment G <br /> • Sensitive Receptor Survey In January 2003, SECOR performed a sensitive receptor <br /> survey which Included a search of Department of Water Resource, contact of the local water <br /> purveyor, and a 500-foot door-to-door well search Based on SECOR's receptor survey, 12 <br /> wells are present within 1/2 mile of the site Eight of the twelve well are upgradient or cross- <br /> gradient The four down-gradient wells (to the north) are located approximately 1,500 to <br /> 2,500 feet from the site Well information is included in Table 5 and well locations are shown <br /> on Figure 3 <br /> CONCLUSION <br /> Based on analytical results the lateral extent of petroleum hydrocarbons in soil have been delineated <br /> Hydrocarbon impacted soil reported in well MW-12 is most likely due to transport of petroleum <br /> hydrocarbons through the capillary fringe Petroleum impact to soil in the area of well MW-12 <br /> appears limited based on nondetect concentrations in adjacent boring GP-8 <br /> Based on the analytical results, the lateral extent of petroleum hydrocarbons in groundwater are <br /> adequately delineated with the exception of the area northeast of well MW-12 SECOR suggests the <br /> one additional quarterly sampling event be conducted prior to initiation of additional investigation <br /> northeast of well MW-12 A work plan for additional investigation northeast of well MW-12 will be <br /> submitted by March 31, 2003 Upon completion of assessment northeast of MW-12, a Corrective <br /> Action Plan will be prepared for the site <br /> If there are any questions, please call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR International, Incorporated <br /> ;�pfkOFESClinton Harms S/p <br /> Project Scientist ~�Q.S E ��N'7o ��`2 <br /> 9 <br /> No C 058399 <br /> Exp <br /> n; <br /> s BEkoqsky, ESenior EnginCFCALIFOR� <br /> cc Mr Mike Infurna, SJC PHS <br /> Mr Marty Hartzell, RWQCB, Sacramento Office <br /> 11CanocoPhiihps\Tosco Marketing112051Repor1s\AssmtRpt doc <br />