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Home My WebLink AboutCT 98-12; Magnolia Gardens; Tentative Map (CT) (55)GARYW.ERBECK DEPARTMENT OF FNVIRONMFNTAI HFAI TH RICHARD HAASDIRECTOR DEPARTMENT OF ENVIRONMENTAL HEALTH ASSISTANT DIRECTOR LAND AND WATER QUALITY DIVISION P.O. BOX 129261, SAN DIEGO, CA 92112-9261 (619) 338-2222 FAX (619) 338-2377 1-800-253-9933 June 9, 2000 Mr. Dennis Ferdig Pacific Scene Financial, LLC 2505 Congress Street, Suite 220 San Diego, CA92110 Dear Mr. Ferdig: VOLUNTARY ASSISTANCE PROGRAM CASE H38418-001 MAGNOLIA GARDENS DEVELOPMENT I AND II VALLEY STREET (BETWEEN MAGNOLIA AVE. AND CHESTNUT AVE.) CARLSBAD, CA The site remediation information submitted to this agency by GeoSoils consultants, summarizing the site characterization and mitigation activities at the above-referenced location, has been reviewed. With the provision that the information provided to this agency was accurate and representative of existing conditions, it is the position of this office that no further action is required at this time. Please be advised that this letter does not relieve you of any liability under the California Health and Safety Code or the Porter Cologne Water Quality Control Act. If previously unidentified contamination is discovered which may affect public health, safety and/or water quality, additional site assessment and cleanup may be necessary. Changes in the proposed use of the above site may require reevaluation to determine if the change will pose a risk to public health. Thank you for your efforts in resolving this matter. Please contact Laurie Apecechea of the Site Assessment and Mitigation Program (SAM), at (619) 338-2457, if you require additional assistance. Sincerely, CHRIS GONAVER, Chief Land and Water Quality Division CG:LA:kf Enclosure cc: Regional Water Quality Control Board Consultant Edward Lump, GeoSoils Inc. WP/38418NF1 "Environmental and public health through leadership, partnership and science" Case Closure Summary , ..„ Non-LOP or Voluntary Assistance Program AGENCY INFORMATION DATE: May 15. 2000 Agency Name: County of San Diego, Environmental Health, SAM City/State/ZIP: San Diego, CA 92112-9261 DEH Staff Person: Laurie Apecechea Address: P.O. Box 129261 Phone:(619)338-2222 Title: Project Manager FAX: (61 9) 338-2377 II.CASE INFORMATION Case No. H3841 8-001 Site Name: Magnolia Gardens Development I and II Site Address: Valley Street, between Magnolia Avenue and Chestnut Avenue, Carlsbad, CA Property Owner: Pacific Scene Homes Responsible/Requesting Party : (same) Type of Case: Non-Tank Case Address: 2505 Congress Street Address: San Diego, CA 92110 Phone: Dennis Ferdig Phone: (619)299-5112 RWQCB/DTSC notification of DEH Oversight: 7/20/99 III.SITE CHARACTERIZATION AND/OR INFORMATION Cause and Type of Contamination (if any): Pesticide contaminated soil. Agricultural land to residential conversion Site Characterization complete?Yes Monitoring Wells Installed?Yes Total Number: 1 Proper Screened Interval? Yes Number of decommissioned wells: Range of groundwater levels on the site? 18 feet to 20 feet Groundwater Flow Direction: Unknown Most Sensitive Current Use: Groundwater having designated or potential beneficial uses for: Municipal/Domestic Agricultural Industrial Are Drinking Water Wells Affected? No RWQCB Basin Number: 904.21 Is Surface Water Affected?No Nearest Surface Water name: Aqua Hedionda Off-Site Beneficial Use Impacts (addresses/locations): None TREATMENT AND DISPOSAL OF AFFECTED MATERIAL Material Amount (Include Units)Action (Treatment or Disposal w/Destination)Date soil 1,110 cubic yards Buried on site*unknown Non-LOP - Underground Storage Tank Oversight handled outside the LOP Non-Tank - Voluntary Assistance Program DEH:HM-9159 (Rev. 6/99)Page 1 of 2 III. __.w Case Closure Summary Non-LOP or Voluntary Assistance Program SITE CHARACTERIZATION AND/OR INFORMATION (Continued)H38418-001 Contaminant DDT total Toxaphene DEHP Lead 2,4,5-T Soil (ppm) Before .286 1.04 .072 19 .0064 After .286 1.04 .072 19 .0064 Water (ppm) Before <.0001 <.010 N/A N/A N/A After <.0001 <.010 N/A N/A N/A Contaminant 2,4-DB Heptachlor Epoxide TRPH TPH-G TPH-D Soil (ppm) Before .0089 .0005 N/A <10 <10 After .0089 .0005 N/A <10 <10 Water (ppm) Before N/A <.0005 31.8 <.05 <.5 After N/A <.0005 31.8 <.05 <.5 MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS - - BEFORE AND AFTER CLEANUP Comments: A limited Phase I environmental site assessment and limited agricultural chemical residue survey was conducted to fulfill the requirement of the City of Carlsbad's Standard Agricultural area Mitigation Condition. A total of 12 soil samples were originally taken from the upper 1 1/2 feet within the 5-acre site. The analytical results were compared to the Preliminary Remedial Goals (PRG's) to evaluate the risk to human health. Only one sample result was above the PRG values. Toxaphene was found at 1.04 mg/kg which is less than the hazardous waste criteria but greater than the PRG at .4 mg/kg. The consultant states that this sample concentration appears to represent an outlier and is not representative of site conditions. All of the other samples are non-detect for Toxaphene including the sample taken in thesame spot at 1 1/2 feet. A groundwater monitoring well was installed and sampled to determine groundwater impacts. The analytical results indicate the agricultural operations on the property have not adversely affected groundwater. A second sampling event occurred to address the chemical mixing areas that were not sampled originally. An additional 10 soil samples were collected at the site including the new parcel Magnolia Gardens II which is a 1.8 acre site. The results are below the PRG values for the contaminants. The analytical results of the second sampling event are consistent with similar farmlands in San Diego County. The majority of contaminants detected fall within the Chlorinated Pesticides suite which are known for their persistence in nature. The consultant has proposed remedial earthwork for the Toxaphene contaminated soil. The soil will be placed under the proposed roadway and not within 10 feet of finish pad grades. The soil will be buried at least 5 feet to mitigate the potential for human contact. DEH concurs with the proposed remedial activity as presented in the March 15,1999 limited site assessment report and in the GeoSoils letter dated May 11, 2000. Since Toxaphene is very volatile, precautions must be taken to assure worker safety during the soil burial process. See Section VII below for additional requirements. IV.CLOSURE Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Yes Does corrective action protect public health for current land use? Yes Case review based on proposed use as residences. Are there other issues DEH needs to follow up on: Yes* Site Management Requirements: None Should corrective action be reviewed if land use changes? Yes List Enforcement Actions Taken: N/A List Enforcement Actions Rescinded: N/A Is this account UD to date and current?: Yes V.LOCAL AGENCY REPRESENTATIVE DATA Name: Kevin Heaton Signature: ^/£ . J&? sd^ Title: Senior Hydrogeologist Land and Water Quality Division Date: 6y/?/Zc**y VI. RWQCB NOTIFICATION Date Submitted to RWQCB: N/A RWQCB Staff Name: RWQCB Response: Title: Date: DEH:HM-9159(Rev. 6/99)Page 2 of 3 Case Closure Summary ._, Nbn-LOP or Voluntary Assistance Program VII. ADDITIONAL COMMENTS. DATA. ETC. H38418-001 * Once the remedial action is completed, DEH is requesting that GeoSoils submit a certification letter to this department that the contaminated soil was placed under the roadways according to the criteria listed in the March 15,1999 limited site assessment report and letter dated May 11, 2000. This document and the related CASE CLOSURE LETTER, shall be retained by the lead agency as part of the official site file. DEH:HM-9159 (Rev. 6/99) Page 3 of 3